Foldable electronic devices

Abstract

The present application discloses a foldable electronic device, including a first device body, a second device body, an earpiece, an antenna and a first switch control circuit, wherein the antenna includes a main radiator and a first parasitic radiator, the main radiator is arranged on the first device body, the first parasitic radiator and the earpiece are arranged on the second device body, and when the foldable electronic device is in a folded state, the main radiator and the first parasitic radiator are arranged relative to each other at a first interval, and are coupled to the first parasitic radiator through the first interval. The first switch control circuit includes a first switch device and a plurality of different first matching branches arranged in parallel, one end of the first switch control circuit is connected to the ground of the second device body, and the other end is connected to the first parasitic radiator. The present application can improve the antenna performance in a free space scenario or a handheld scenario when in a folded state, and can also improve the antenna performance of the antenna located at the top in a head-hand-held scenario.

Description

Technical Field

[0001] The present application relates to the field of antennas, and in particular to a foldable electronic device. Background Art

[0002] In order to bring more comfortable visual effects to mobile phone users, new foldable mobile phones are the current development trend of mobile phones. There are more and more RF specifications for mobile phones, and the number of antennas required to be supported is also increasing. However, the new form of mobile phones makes part of the space of mobile phones unusable. Designing antennas with better performance in limited space has become the focus. With the development of communication technology, how to improve antenna performance in various test scenarios (such as head-hand holding scenario, handheld scenario, free space scenario) has become an issue that the industry needs to pay close attention to. Summary of the invention

[0003] An embodiment of the present application provides a foldable electronic device, which, when in a folded state, can improve the antenna performance in a free space scenario or a handheld scenario, and, when the antenna is arranged on the top of the foldable electronic device, can improve the antenna performance in a head-hand-held scenario.

[0004] The embodiment of the present application provides a foldable electronic device, including a first device body, a second device body, an earpiece and an antenna, wherein the first device body and the second device body are connected via a rotating shaft;

[0005] The antenna includes a main radiator and a first parasitic radiator, the main radiator is arranged on the first device body and connected to the radio frequency source of the foldable electronic device, the first parasitic radiator and the earpiece are arranged on the second device body, when the foldable electronic device is in a folded state, the main radiator and the first parasitic radiator are arranged opposite to each other at a first interval, and the main radiator is coupled to the first parasitic radiator through the first interval;

[0006] The foldable electronic device further includes a first switch control circuit, the first parasitic radiator is electrically connected to the ground of the second device body through the first switch control circuit, and the first switch control circuit includes a first switch device and a plurality of different first matching branches arranged in parallel;

[0007] Switching between a plurality of different first matching branches by means of a first switching device to adjust the resonant frequency of the first parasitic radiator;

[0008] When the foldable electronic device is in a folded state, when the earpiece is in a closed state, the resonant frequency of the first parasitic radiator and the resonant frequency of the main radiator are within a first frequency band; when the earpiece is in an open state, the resonant frequency of the main radiator is within the first frequency band, and the resonant frequency of the first parasitic radiator is within a second frequency band, wherein the first frequency band and the second frequency band are different frequency bands.

[0009] In this solution, different first matching branches are selected by the first switching device to adjust the resonant frequency of the first parasitic radiator. When the resonant frequency of the first parasitic radiator and the resonant frequency of the main radiator are within the first frequency band, when the foldable electronic device is in the folded state, the radiation energy of the main radiator is coupled to the first parasitic radiator, so that the first parasitic radiator radiates signals outward, that is, the first parasitic radiator plays a parasitic radiation role on the main radiator, which can reduce the body SAR value, increase the transmission power of the antenna, and improve the efficiency of the antenna, thereby improving the antenna performance of the foldable electronic device in a free space scene or a handheld scene when the foldable electronic device is in the folded state. Among them, SAR (Specific Absorption Rate, the full name of English is "Specific Absorption Rate") refers to the electromagnetic power absorbed by a unit mass of human tissue, and the unit is W / kg. SAR values ​​are generally used internationally to measure the thermal effect of radiation from foldable electronic devices. The body SAR value represents the average specific absorption rate of the body when the antenna is close to the body.

[0010] When the resonant frequency of the main radiator is within the first frequency band and the resonant frequency of the first parasitic radiator is within the second frequency band, when the foldable electronic device is in the folded state, the coupling degree of the radiation energy of the main radiator with the first parasitic radiator is very low, and it may not even be coupled to the first parasitic radiator, that is, the parasitic radiation effect of the first parasitic radiator on the main radiator is very weak, and it may not even have any parasitic radiation effect on the main radiator. At this time, the first parasitic radiator can block and isolate the radiation of the main radiator of the antenna toward the first parasitic radiator, so that when the antenna is located at the top of the foldable electronic device, the head SAR value of the antenna is reduced in the head-hand-held scenario, and the degree of attenuation of the radiation performance of the foldable electronic device is reduced, that is, the head-hand-held drop is reduced, thereby improving the radiation performance of the foldable electronic device in the head-hand-held scenario, that is, improving the antenna performance in the head-hand-held scenario when the foldable electronic device is in the folded state. The head SAR value represents the average specific absorption rate of the body when the antenna is close to the head.

[0011] In some possible embodiments, the main radiator and the first parasitic radiator are both in a strip shape; the main radiator and the first parasitic radiator are laterally arranged opposite to each other at a first interval.

[0012] In some possible embodiments, one end of the first switching device forms a first end of the first switching control circuit, the other end of the first switching device is selected to connect one end of multiple different first matching branches, and the other ends of the multiple different first matching branches jointly form a second end of the first switching control circuit.

[0013] In some possible embodiments, the first switch device is used to switch between the plurality of different first matching branches to adjust the resonant frequency of the first parasitic radiator, so that the resonant frequency of the first parasitic radiator approaches the resonant frequency of the main radiator or moves away from the resonant frequency of the main radiator.

[0014] When the foldable electronic device is in a folded state, when the earpiece is in a closed state, the resonant frequency of the first parasitic radiator approaches the resonant frequency of the main radiator; when the earpiece is in an open state, the resonant frequency of the first parasitic radiator moves away from the resonant frequency of the main radiator.

[0015] In some embodiments, the plurality of different first matching branches include a first sub-matching branch and a second sub-matching branch, and each of the first sub-matching branch and the second sub-matching branch includes a 0-ohm resistor or inductor or capacitor.

[0016] In some embodiments, the first sub-matching branch includes a 0-ohm resistor, and the second sub-matching branch includes an inductor;

[0017] When the first switch device switches on the first sub-matching branch, the resonant frequency of the first parasitic radiator is within the second frequency band;

[0018] When the first switch device switches on another first matching branch, the resonant frequency of the first parasitic radiator is within the first frequency band.

[0019] In the present solution, when the first switching device selects the first sub-matching branch including a 0 ohm resistor, the first parasitic radiator does not have a parasitic radiation effect on the main radiator, and the first parasitic radiator can block and isolate the radiation from the main radiator of the antenna toward the first parasitic radiator. Therefore, when the antenna is located on the top of the foldable electronic device, the head SAR value of the antenna is reduced in the head-hand-held scenario, and the degree of attenuation of the radiation performance of the foldable electronic device is reduced, that is, the head-hand-held degradation is reduced, thereby improving the radiation performance of the foldable electronic device in the head-hand-held scenario.

[0020] When the first switching device selects the second sub-matching branch including the inductor, the first parasitic radiator performs parasitic radiation on the main radiator, which can reduce the body SAR value, thereby improving the efficiency of the antenna, increasing the antenna's transmission power, and further improving the antenna performance of the foldable electronic device in a free space scenario or a handheld scenario when the foldable electronic device is in a folded state.

[0021] In some possible embodiments, the trigger signal for the first switching device to switch from the second sub-matching branch including the inductor to the first sub-matching branch including the 0 ohm resistor can be transmitted to the processing device through a signal that the earpiece on the second device body is turned on (or the earpiece makes a sound), or can be transmitted to the processing device through a signal detected by a proximity light sensor provided on the second device body.

[0022] In some embodiments, the main radiator has a first end and a second end, the first parasitic radiator has a first end and a second end, and when the foldable electronic device is in a folded state, the first end of the main radiator and the first end of the first parasitic radiator are correspondingly arranged, and the second end of the main radiator and the second end of the first parasitic radiator are correspondingly arranged;

[0023] The second end of the main radiator is connected to the ground of the first device body, the main radiator has a feeding point, the feeding point is located near the first end of the main radiator, and the feeding point is connected to the radio frequency source;

[0024] The second end of the first parasitic radiator is connected to the ground of the second device body. The first parasitic radiator has a first connection point located near the first end of the first parasitic radiator and connected to the first switch control circuit.

[0025] In some embodiments, the distance between the feeding point and the first end of the main radiator is 1.5 mm to 3 mm; and / or the distance between the first connection point and the first end of the first parasitic radiator is 1.5 mm to 3 mm. This can better meet the coupling requirements between the main radiator and the first parasitic radiator.

[0026] In some possible embodiments, the distance of the first interval is 2 mm to 4 mm, so as to ensure the coupling strength between the main radiator and the first parasitic radiator.

[0027] In some possible embodiments, the resonant frequency of the main radiator is related to the length of the main radiator. The resonant frequency of the first parasitic radiator is related to the length of the first parasitic radiator. As the length of the main radiator changes, the resonant frequency of the main radiator itself changes. As the length of the first parasitic radiator changes, the resonant frequency of the first parasitic radiator changes. Therefore, the lengths of the main radiator and the first parasitic radiator can be selected appropriately according to the working frequency band requirements.

[0028] In some embodiments, the foldable electronic device further comprises a main switch control circuit, the main switch control circuit comprising a main switch device and a plurality of different main matching branches arranged in parallel, one end of the main switch device forms one end of the main switch control circuit, and the other end can be respectively selected to connect one end of the plurality of different main matching branches, and the other ends of the plurality of different main matching branches jointly form the other end of the main switch control circuit;

[0029] Among them, one end of the main switch control circuit is connected to the ground of the first device body, and the other end is connected between the RF source and the feeding point of the main radiator; or, one end of the main switch control circuit is connected between the RF source and the feeding point of the main radiator, and the other end is connected to the ground of the first device body; the main switch device is switched to one of multiple different main matching branches to adjust the resonant frequency of the main radiator.

[0030] By switching the main switch device to a plurality of different main matching branches, the resonant frequency of the main radiator can be adjusted, so that the antenna can cover different frequency bands.

[0031] In some embodiments, two main matching branches of the plurality of different main matching branches both include inductors, and the inductors of the two main matching branches have different inductance values.

[0032] In some embodiments, the main radiator and the first parasitic radiator are both in the shape of straight strips;

[0033] And / or, when the foldable electronic device is in a folded state, the main radiator and the first parasitic radiator are arranged parallel to each other;

[0034] And / or, when the foldable electronic device is in a folded state, the first end of the main radiator is aligned with the first end of the first parasitic radiator, and the second end of the main radiator is aligned with the second end of the first parasitic radiator.

[0035] In some embodiments, the antenna also includes a second parasitic radiator, which is disposed on the first device body, and the second parasitic radiator is longitudinally spaced relative to the main radiator end to end. The second parasitic radiator has a first end and a second end. The first end of the second parasitic radiator is relatively close to the first end of the main radiator and has a first gap. The second parasitic radiator is coupled to the main radiator through the first gap, and the second end of the second parasitic radiator is relatively far away from the second end of the main radiator and is connected to the ground of the first device body.

[0036] In this solution, the second parasitic radiator is coupled with the main radiator through the first gap, which can further reduce the body SAR value, improve the efficiency of the antenna, and enhance the transmission power of the antenna.

[0037] In some possible embodiments, the second parasitic radiator is in a strip shape.

[0038] In some embodiments, the second parasitic radiator has a second connection point, and the second connection point is located near the first end of the second parasitic radiator;

[0039] The foldable electronic device further includes a second switch control circuit, the second switch control circuit includes a second switch device and a plurality of different second matching branches arranged in parallel, one end of the second switch device forms one end of the second switch control circuit, and the other end of the second switch device can be respectively connected to one end of the plurality of different second matching branches, and the other ends of the plurality of different second matching branches jointly form the other end of the second switch control circuit;

[0040] Among them, one end of the second switch control circuit is connected to the ground of the first device body, and the other end is connected to the second connection point of the second parasitic radiator; or, one end of the second switch control circuit is connected to the second connection point of the second parasitic radiator, and the other end is connected to the ground of the first device body; the resonant frequency of the second parasitic radiator is adjusted by switching between multiple different second matching branches through the second switch device.

[0041] By switching the second switch device to a plurality of different second matching branches, the resonant frequency of the second parasitic radiator can be adjusted, so that the antenna can cover different frequency bands.

[0042] In some embodiments, two second matching branches of the plurality of different second matching branches each include an inductor, and the inductance values ​​of the inductors in the two second matching branches are different.

[0043] In some embodiments, the distance between the second connection point and the first end of the second parasitic radiator is 1.5 mm to 3 mm, which can better meet the coupling requirements between the main radiator and the second parasitic radiator.

[0044] In some embodiments, the second parasitic radiator is in the shape of a straight bar;

[0045] And / or, the main radiator and the second parasitic radiator are arranged in a straight line.

[0046] In some embodiments, the antenna further includes a third parasitic radiator, which is disposed on the second device body, and the third parasitic radiator is longitudinally spaced opposite to the first parasitic radiator end to end, and the third parasitic radiator has a first end and a second end, the first end of the third parasitic radiator is relatively close to the first end of the first parasitic radiator and has a second gap, the second end of the third parasitic radiator is relatively far away from the second end of the first parasitic radiator, and is connected to the ground of the second device body; the third parasitic radiator has a third connection point, and the third connection point is located at a position close to the first end of the third parasitic radiator; when the foldable electronic device is in a folded state, the third parasitic radiator is arranged opposite to the second parasitic radiator at a second interval, and is coupled to the second parasitic radiator through the second interval, and the third parasitic radiator is coupled to the first parasitic radiator through the second gap, and the third parasitic radiator is also coupled to the main radiator;

[0047] The foldable electronic device further includes a third switch control circuit, the third connection point of the third parasitic radiator is electrically connected to the ground of the second device body through the third switch control circuit, the third switch control circuit includes a third switch device and a plurality of different third matching branches arranged in parallel, and the third switch device switches between the plurality of different third matching branches to adjust the resonant frequency of the third parasitic radiator;

[0048] When the foldable electronic device is in a folded state, when the earpiece is in a closed state, the resonant frequency of the third parasitic radiator is within the first frequency band; when the earpiece is in an open state, the resonant frequency of the third parasitic radiator is within the second frequency band.

[0049] In the present solution, different third matching branches are selected by the third switching device to adjust the parasitic radiation effect of the third parasitic radiator. When the third switching device is selected to one of the third matching branches, the parasitic radiation effect of the third parasitic radiator on the main radiator is very weak, or even has no parasitic radiation effect on the main radiator. At this time, the third parasitic radiator can block and isolate the radiation of the main radiator and the second parasitic radiator of the antenna toward the third parasitic radiator. Therefore, when the antenna is located on the top of the foldable electronic device, the head SAR value of the antenna is reduced in the head-hand-held scenario, and the degree of attenuation of the radiation performance of the foldable electronic device is reduced, that is, the head-hand-held degradation is reduced, thereby improving the radiation performance of the foldable electronic device in the head-hand-held scenario.

[0050] When the third switch device is selected to another third matching branch, the third parasitic radiator plays a parasitic radiation role on the main radiator, which can reduce the body SAR value, improve the efficiency of the antenna, and increase the antenna's transmission power, thereby improving the antenna performance of the foldable electronic device in a free space scenario or a handheld scenario when the foldable electronic device is in a folded state.

[0051] In some possible embodiments, the third parasitic radiator is in a strip shape; when the foldable electronic device is in a folded state, the third parasitic radiator and the second parasitic radiator are disposed opposite to each other side by side at a second interval.

[0052] In some possible embodiments, one end of the third switch device forms one end of the third switch control circuit, and the other end can be respectively connected to one end of a plurality of different third matching branches, and the other ends of the plurality of different third matching branches jointly form the other end of the third switch control circuit;

[0053] One end of the third switch control circuit is connected to the ground of the second device body, and the other end is connected to the third connection point of the third parasitic radiator; or one end of the third switch control circuit is connected to the third connection point of the third parasitic radiator, and the other end is connected to the ground of the second device body;

[0054] In some possible embodiments, the third switch device is switched to one of a plurality of different third matching branches to adjust the resonant frequency of the third parasitic radiator so that the resonant frequency of the third parasitic radiator approaches the resonant frequency of the main radiator or moves away from the resonant frequency of the main radiator;

[0055] When the earpiece is in a closed state, the resonant frequency of the third parasitic radiator approaches the resonant frequency of the main radiator; when the earpiece is in an open state, the resonant frequency of the third parasitic radiator moves away from the resonant frequency of the main radiator.

[0056] In some embodiments, the plurality of different third matching branches include a third sub-matching branch and a fourth sub-matching branch, the third sub-matching branch includes a 0-ohm resistor, and the fourth sub-matching branch includes an inductor;

[0057] When the third switch device selects the third sub-matching branch, the resonant frequency of the third parasitic radiator is within the second frequency band;

[0058] When the third switch device switches on the fourth sub-matching branch, the resonant frequency of the third parasitic radiator is within the first frequency band.

[0059] In this solution, when the third switch device selects the third sub-matching branch including the 0-ohm resistor, the third parasitic radiator does not play a parasitic radiation role on the main radiator. When the third switch device selects the fourth sub-matching branch including the inductor, the third parasitic radiator plays a parasitic radiation role on the main radiator.

[0060] In some embodiments, the distance between the third connection point and the first end of the third parasitic radiator is 1.5 mm to 3 mm, which can better meet the coupling requirements between the main radiator and the third parasitic radiator.

[0061] In some embodiments, the third parasitic radiator is in the shape of a straight bar;

[0062] And / or, the third parasitic radiator and the first parasitic radiator are arranged in a straight line, and when the foldable electronic device is in a folded state, the third parasitic radiator and the second parasitic radiator are arranged parallel to each other;

[0063] And / or, when the foldable electronic device is in the folded state, the first end of the third parasitic radiator is aligned with the first end of the second parasitic radiator, and the second end of the third parasitic radiator is aligned with the second end of the second parasitic radiator.

[0064] In some embodiments, when the foldable electronic device is in a folded state, the antenna is located at the top or bottom of the foldable electronic device or at a side away from the hinge.

[0065] In some possible embodiments, the main radiator, the first parasitic radiator, the second parasitic radiator and the third parasitic radiator can be formed by a metal frame of a foldable electronic device, or a metal sheet (such as a steel sheet), or a flexible printed circuit (Flexible Printed Circuit FPC), or can be formed in the form of LDS (Laser Direct Structuring).

[0066] In some possible embodiments, the first device body is the device body on the side where the main screen of the foldable electronic device is located, and the second device body is the device body on the side where the secondary screen of the foldable electronic device is located.

[0067] In some embodiments, the antenna is formed by a metal frame at the top of the foldable electronic device, and the earpiece is located at the top of the foldable electronic device.

[0068] In some embodiments, the foldable electronic device further includes a processing device, and the foldable electronic device is in a folded state.

[0069] When the handset is turned on and a first trigger signal is generated, the processing device controls the first switch device to select a first sub-matching branch in a plurality of different first matching branches in response to the first trigger signal, so that the resonant frequency of the first parasitic radiator is within the second frequency band; and

[0070] When the handset is turned off and a second trigger signal is generated, the processing device controls the first switch device to select the second sub-matching branch in the plurality of different first matching branches in response to the second trigger signal, so that the resonant frequency of the first parasitic radiator is within the first frequency band.

[0071] In some embodiments, the foldable electronic device further includes a trigger device and a processing device; the foldable electronic device is in a folded state,

[0072] When the trigger device generates a first trigger signal, the processing device controls the first switch device to select a first sub-matching branch in a plurality of different first matching branches in response to the first trigger signal, so that the resonant frequency of the first parasitic radiator is within the second frequency band;

[0073] When the trigger device generates a second trigger signal, the processing device controls the first switch device to select the second sub-matching branch in the plurality of different first matching branches in response to the second trigger signal, so that the resonant frequency of the first parasitic radiator is within the first frequency band.

[0074] In some embodiments, the trigger device is a proximity light sensor, an ambient light sensor, or a distance sensor, wherein when the trigger device is blocked by the user's body, the trigger device generates a first trigger signal, and when the trigger device is away from the user's body, the trigger device generates a second trigger signal.

[0075] The embodiment of the present application further provides a foldable electronic device, comprising a first device body, a second device body, an earpiece and an antenna, wherein the first device body and the second device body are rotatably connected via a rotating shaft, so that the foldable electronic device can be switched between an unfolded state and a folded state;

[0076] The antenna comprises a main radiator, a first parasitic radiator, a second parasitic radiator and an isolation part, the main radiator and the first parasitic radiator are arranged on the first device body, the second parasitic radiator, the isolation part and the earpiece are arranged on the second device body, and the main radiator is connected to the radio frequency source of the foldable electronic device;

[0077] The main radiator, the first parasitic radiator, the second parasitic radiator and the isolation portion are all in a strip shape and have a first end and a second end; wherein,

[0078] The main radiator and the first parasitic radiator are arranged end to end in a longitudinal direction with a spacing therebetween, the first end of the main radiator is connected to the ground of the first device body, the second end of the main radiator is relatively close to the first end of the first parasitic radiator and has a gap, the main radiator is coupled to the first parasitic radiator through the gap, and the second end of the first parasitic radiator is relatively far away from the first end of the main radiator and connected to the ground of the first device body;

[0079] The isolation portion and the second parasitic radiator are arranged in a straight line, the first end and the second end of the isolation portion are respectively connected to the ground of the second device body, the second end of the isolation portion is connected to the first end of the second parasitic radiator, and the second end of the second parasitic radiator is a free end;

[0080] When the foldable electronic device is in a folded state, the isolation portion is laterally spaced apart from the main radiator and the first parasitic radiator, respectively; in the length direction of the first parasitic radiator, the first end of the second parasitic radiator is located between the second end and the first end of the first parasitic radiator and is close to the second end of the first parasitic radiator; or, the first end of the second parasitic radiator is flush with the second end of the first parasitic radiator, and the second parasitic radiator is coupled to the first parasitic radiator.

[0081] In the present solution, the isolation portion can block and isolate the radiation of the main radiator and the first parasitic radiator of the antenna toward the isolation portion, thereby reducing the head SAR value of the antenna in the head-hand-held scenario when the antenna is located on the top of the foldable electronic device, and reducing the degree of attenuation of the radiation performance of the foldable electronic device, that is, reducing the head-hand-held degradation, thereby improving the radiation performance of the foldable electronic device in the head-hand-held scenario, that is, improving the antenna performance in the head-hand-held scenario when the foldable electronic device is in a folded state.

[0082] In addition, the first parasitic radiator is coupled with the main radiator, and the second parasitic radiator is coupled with the first parasitic radiator, which reduces the body SAR value, improves the efficiency of the antenna, and increases the transmission power of the antenna, thereby improving the antenna performance of the foldable electronic device in a free space scenario or a handheld scenario when the foldable electronic device is in a folded state.

[0083] In some embodiments, in the length direction of the first parasitic radiator, the distance between the first end of the second parasitic radiator and the second end of the first parasitic radiator is greater than or equal to 0 and less than or equal to 2 mm, which can better meet the coupling requirements of the second parasitic radiator and the first parasitic radiator.

[0084] In some embodiments, the first parasitic radiator has a first connection point, the first connection point being located proximate to a first end of the first parasitic radiator;

[0085] The foldable electronic device further includes a first switch control circuit, the first switch control circuit including a first switch device and a plurality of different first matching branches arranged in parallel, one end of the first switch device forming one end of the first switch control circuit, the other end of the first switch device being strobed and connected to one end of the plurality of different first matching branches, and the other ends of the plurality of different first matching branches jointly forming the other end of the first switch control circuit;

[0086] Wherein, one end of the first switch control circuit is connected to the ground of the first device body, and the other end is connected to the first connection point of the first parasitic radiator; or, one end of the first switch control circuit is connected to the first connection point of the first parasitic radiator, and the other end is connected to the ground of the first device body;

[0087] By switching the first switch device to one of a plurality of different first matching branches, the resonant frequency of the first parasitic radiator is adjusted, so that the antenna can cover different frequency bands.

[0088] In some embodiments, two second matching branches of the plurality of different first matching branches each include an inductor, and the inductors of the two first matching branches have different inductance values.

[0089] In some embodiments, the distance between the first connection point and the first end of the first parasitic radiator is 1.5 mm to 3 mm, which can better meet the coupling requirements between the main radiator and the first parasitic radiator.

[0090] In some embodiments, the second parasitic radiator has a second connection point, and the second connection point is located near a second end of the second parasitic radiator;

[0091] The foldable electronic device further includes a second switch control circuit, the second switch control circuit includes a second switch device and a plurality of different second matching branches arranged in parallel, one end of the second switch device forms one end of the second switch control circuit, and the other end of the second switch device is strobed and connected to one end of the plurality of different second matching branches, and the other ends of the plurality of different second matching branches jointly form the other end of the second switch control circuit;

[0092] Among them, one end of the second switch control circuit is connected to the ground of the second device body, and the other end is connected to the second connection point of the second parasitic radiator; or, one end of the second switch control circuit is connected to the second connection point of the second parasitic radiator, and the other end is connected to the ground of the second device body; the resonant frequency of the second parasitic radiator is adjusted by switching to one of a plurality of different second matching branches through the second switch device.

[0093] In this solution, different second matching branches are selected by the second switching device to adjust the parasitic radiation effect of the second parasitic radiator. When the second switching device is selected to another second matching branch, the second parasitic radiator has a parasitic radiation effect on the main radiator, which can reduce the body SAR value, improve the efficiency of the antenna, and increase the antenna's transmission power, thereby improving the antenna performance of the foldable electronic device in a free space scenario or a handheld scenario when it is in a folded state.

[0094] When the second switch device is selected to one of the second matching branches, the parasitic radiation effect of the second parasitic radiator on the main radiator is very weak, or even has no parasitic radiation effect on the main radiator. At this time, the second parasitic radiator can block and isolate the radiation of the main radiator of the antenna and the first parasitic radiator toward the second parasitic radiator. Therefore, when the antenna is located on the top of the foldable electronic device, the head SAR value of the antenna is reduced in the head-hand-held scenario, and the degree of attenuation of the radiation performance of the foldable electronic device is reduced, that is, the head-hand-held degradation is reduced, thereby improving the radiation performance of the foldable electronic device in the head-hand-held scenario.

[0095] In some embodiments, two second matching branches of the plurality of different second matching branches respectively include a 0-ohm resistor and an inductor.

[0096] In this solution, when the second switch device switches on the second matching branch including a 0-ohm resistor, the second parasitic radiator does not play a parasitic radiation role on the main radiator. When the second switch device switches on the second matching branch including an inductor, the second parasitic radiator plays a parasitic radiation role on the main radiator.

[0097] In some embodiments, the distance between the second connection point and the second end of the second parasitic radiator is 1.5 mm to 3 mm, which can better meet the coupling requirements between the main radiator and the third parasitic radiator.

[0098] In some embodiments, the main radiator has a feeding point, the feeding point is located near the second end of the main radiator, and the feeding point is connected to the radio frequency source;

[0099] The foldable electronic device also includes a main switch control circuit, which includes a main switch device and a plurality of different main matching branches arranged in parallel, one end of the main switch device forms one end of the main switch control circuit, and the other end of the main switch device can be respectively connected to one end of the plurality of different main matching branches, and the other ends of the plurality of different main matching branches jointly form the other end of the main switch control circuit;

[0100] One end of the main switch control circuit is connected to the ground of the first device body, and the other end is connected between the RF source and the feeding point of the main radiator; or one end of the main switch control circuit is connected between the RF source and the feeding point of the main radiator, and the other end is connected to the ground of the first device body; the main switch device switches to one of a plurality of different main matching branches to adjust the resonant frequency of the main radiator. In this way, the antenna can cover different frequency bands.

[0101] In some embodiments, two main matching branches of the plurality of different main matching branches each include an inductor, and the inductors of the two main matching branches have different inductance values.

[0102] In some embodiments, the distance between the feeding point and the second end of the main radiator is 1.5 mm to 3 mm, which can better meet the coupling requirements between the main radiator and the first parasitic radiator.

[0103] In some embodiments, the main radiator, the first parasitic radiator, the second parasitic radiator and the isolation portion are all in the shape of straight strips;

[0104] And / or, the main radiator and the first parasitic radiator are arranged in a straight line, and when the foldable electronic device is in a folded state, the isolation portion is respectively arranged in parallel with the main radiator and the first parasitic radiator, and the second parasitic radiator is arranged in parallel with the first parasitic radiator;

[0105] And / or, when the foldable electronic device is in a folded state, the first end of the isolation portion is aligned with the first end of the main radiator.

[0106] In some embodiments, when the foldable electronic device is in a folded state, the antenna is located at the top or bottom of the foldable electronic device or at a side away from the hinge.

[0107] In some possible embodiments, the main radiator, the first parasitic radiator, the second parasitic radiator and the isolation portion can be formed by a metal frame of a foldable electronic device, or a metal sheet (such as a steel sheet), or a flexible printed circuit (FPC), or can be formed in the form of LDS (Laser Direct Structuring).

[0108] In some possible embodiments, the first device body is the device body on the side where the main screen of the foldable electronic device is located, and the second device body is the device body on the side where the secondary screen of the foldable electronic device is located. BRIEF DESCRIPTION OF THE DRAWINGS

[0109] Figure 1 This is a schematic diagram of the three-dimensional structure of the foldable electronic device in Example 1 of the present application in a folded state;

[0110] Figure 2 This is a schematic structural diagram of a foldable electronic device in an unfolded state according to Embodiment 1 of the present application;

[0111] Figure 3 This is a schematic structural diagram of the antenna of the foldable electronic device in the folded state according to Embodiment 1 of the present application;

[0112] Figure 4a to Figure 4b The local current distribution diagram of the antenna and the local magnetic field distribution diagram of the antenna in state 1 are obtained when the foldable electronic device of Example 1 of the present application is in a folded state and a simulation effect test is performed;

[0113] Figure 5a to Figure 5b The local current distribution diagram of the antenna and the local magnetic field distribution diagram of the antenna in state 2 are obtained when the foldable electronic device of Example 1 of the present application is in a folded state and a simulation effect test is performed;

[0114] Figure 6 This is a curve diagram showing the comparison of the radiation efficiency and system efficiency of the antenna in a free space scenario and a head-left-hand holding scenario obtained when performing a simulation effect test on the foldable electronic device of Example 1 of the present application;

[0115] Figure 7a to Figure 7c This is a graph showing the efficiency effect of the antenna obtained under three different simulation states when the foldable electronic device of Example 1 of the present application is subjected to a simulation effect test;

[0116] Figure 8a to Figure 8c The local current distribution diagram of the antenna obtained under three different simulation states when the foldable electronic device of Example 1 of the present application is subjected to a simulation effect test;

[0117] Figure 9a to Figure 9cThe local magnetic field distribution diagram of the antenna obtained under three different simulation states when the foldable electronic device of Example 1 of the present application is subjected to a simulation effect test;

[0118] Figure 10a to Figure 10c The antenna hotspot distribution diagrams obtained in three different simulation states when the foldable electronic device of Example 1 of the present application is subjected to a simulation effect test;

[0119] Fig.11 This is a schematic structural diagram of the antenna of the foldable electronic device in the folded state according to Embodiment 2 of the present application;

[0120] Fig.12 This is a curve diagram showing the comparison of the S parameters of the antenna in state 1 and state 2 obtained when performing a simulation effect test on the foldable electronic device of Example 2 of the present application;

[0121] Fig.13 This is a curve diagram showing a comparison of the radiation efficiency and system efficiency (i.e., efficiency) of the antenna in state 1 and state 2 obtained during a simulation effect test of the foldable electronic device of Example 2 of the present application;

[0122] Figure 14a to Figure 14b The local magnetic field distribution diagram of the antenna in state 1 and state 2 obtained when the foldable electronic device of Example 2 of the present application is subjected to a simulation effect test;

[0123] Figure 15a to Figure 15b The antenna hotspot distribution diagrams in state 1 and state 2 obtained when the foldable electronic device of Example 2 of the present application is subjected to a simulation effect test;

[0124] Fig.16 This is a curve chart comparing the radiation efficiency and system efficiency (i.e., efficiency) of the antenna in the free space scenario, the head left hand holding scenario, and the head right hand holding scenario obtained during the simulation effect test of the foldable electronic device of Example 2 of the present application.

[0125] Description of reference numerals:

[0126] Example 1

[0127] 100: Foldable electronic devices;

[0128] 200: first device body; 201: floor: 202: main board; 220: second device body; 221: floor: 222: main board; 240: rotating shaft; 260: radio frequency source;

[0129] 400: antenna;

[0130] 410: main radiator; 411: first end; 412: second end; 413: feeding point;

[0131] 420: first parasitic radiator; 421: first end; 422: second end; 423: first connection point;

[0132] 430: second parasitic radiator; 431: first end; 432: second end; 433: second connection point;

[0133] 440: third parasitic radiator; 441: first end; 442: second end; 443: third connection point;

[0134] 450: first interval;

[0135] 460: second interval;

[0136] 470: First gap;

[0137] 480: Second gap;

[0138] 500: main switch control circuit; 510: main switch device; 520: one of the main matching branches; L01: inductor; 530: another main matching branch; L02: inductor; 540: one end of the main switch control circuit; 550: the other end of the main switch control circuit;

[0139] 600: first switch control circuit; 610: first switch device; 620: one of the first matching branches; 630: another first matching branch; L1: inductor; 640: one end of the first switch control circuit; 650: the other end of the first switch control circuit;

[0140] 700: second switch control circuit; 710: second switch device; 720: one of the second matching branches; L21: inductor; 730: another second matching branch; L22: inductor; 740: one end of the second switch control circuit; 750: the other end of the second switch control circuit;

[0141] 800: a third switch control circuit; 810: a third switch device; 820: one of the third matching branches; 830: another third matching branch; L3: an inductor; 840: one end of the third switch control circuit; 850: the other end of the third switch control circuit;

[0142] L: length of the main radiator;

[0143] L1: length of the first parasitic radiator;

[0144] L2: length of the second parasitic radiator;

[0145] L3: length of the third parasitic radiator;

[0146] d1: distance of the first interval;

[0147] d2: distance of the second interval;

[0148] d3: the width of the first gap;

[0149] d4: the width of the second gap;

[0150] d5: distance between the feed point and the first end of the main radiator;

[0151] d6: distance between the first connection point and the first end of the first parasitic radiator;

[0152] d7: distance between the second connection point and the first end of the second parasitic radiator;

[0153] d8: the distance between the third connection point and the first end of the third parasitic radiator.

[0154] Example 2

[0155] 260A: RF source;

[0156] 400A: Antenna;

[0157] 410A: main radiator; 411A: first end; 412A: second end; 413A: feeding point;

[0158] 420A: first parasitic radiator; 421A: first end; 422A: second end; 423A: first connection point;

[0159] 430A: second parasitic radiator; 431A: first end; 432A: second end; 433A: second connection point;

[0160] 440A: isolation portion; 441A: first end; 442A: second end;

[0161] 470A: gap;

[0162] 500A: main switch control circuit; 510A: main switch device; 520A: one of the main matching branches; L01: inductor; 530A: another main matching branch; L02: inductor; 540A: one end of the main switch control circuit; 550A: the other end of the main switch control circuit;

[0163] 600A: first switch control circuit; 610A: first switch device; 620A: one of the first matching branches; L11: inductor; 630A: another first matching branch; L12: inductor; 640A: one end of the first switch control circuit; 650A: the other end of the first switch control circuit;

[0164] 700A: second switch control circuit; 710A: second switch device; 720A: one of the second matching branches; 730A: another second matching branch; L2: inductor; 740A: one end of the second switch control circuit; 750A: the other end of the second switch control circuit;

[0165] L: length of the main radiator;

[0166] L1: length of the first parasitic radiator;

[0167] L2: length of the second parasitic radiator;

[0168] L3: length of the isolation part;

[0169] d1: distance between the first parasitic radiator and the isolation portion;

[0170] d2: the width of the gap;

[0171] d3: distance between the feed point and the second end of the main radiator;

[0172] d4: distance between the first connection point and the first end of the first parasitic radiator;

[0173] d5: the distance between the second connection point and the second end of the second parasitic radiator. DETAILED DESCRIPTION

[0174] The following specific embodiments illustrate the implementation of the present application, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Although the description of the present application will be introduced in conjunction with some embodiments, this does not mean that the features of this application are limited to the implementation. On the contrary, the purpose of introducing the application in conjunction with the implementation is to cover other options or modifications that may be extended based on the claims of the present application. In order to provide a deep understanding of the present application, the following description will include many specific details. The present application can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present application, some specific details will be omitted in the description. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0175] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0176] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0177] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0178] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below in conjunction with the accompanying drawings.

[0179] Example 1

[0180] See also Figure 1 to Figure 3 , Figure 1 This is a schematic diagram of the three-dimensional structure of the foldable electronic device 100 in Example 1 of the present application in a folded state. Figure 2 This is a schematic structural diagram of the foldable electronic device 100 in the unfolded state according to Embodiment 1 of the present application. Figure 3 FIG. 4 is a schematic diagram of the structure of the antenna 400 of the foldable electronic device 100 in the folded state according to Embodiment 1 of the present application. Figure 1 to Figure 3 As shown, the embodiment of the present application provides a foldable electronic device 100, which includes a first device body 200, a second device body 220, a handset (not shown in the figure), an antenna 400 and a first switch control circuit 600. In this embodiment, the foldable electronic device 100 is illustrated by a foldable smartphone. Of course, it can be understood by those skilled in the art that in other alternative embodiments, the foldable electronic device can also be other foldable electronic devices such as a foldable tablet computer or a foldable smart watch, which does not limit the scope of protection of the present application.

[0181] like Figure 1 to Figure 3As shown, the first device body 200 and the second device body 220 are rotatably connected via a rotating shaft 240, so that the foldable electronic device 100 can switch between an unfolded state and a folded state. In this embodiment, the first device body 200 is the device body on the side where the main screen of the foldable electronic device 100 is located, and the second device body 220 is the device body on the side where the secondary screen of the foldable electronic device 100 is located. Of course, those skilled in the art can understand that in other alternative embodiments, the first device body 200 may be the device body on the side where the secondary screen of the foldable electronic device 100 is located, and the second device body 220 is the device body on the side where the main screen of the foldable electronic device 100 is located, and this does not limit the scope of protection of the present application.

[0182] The antenna 400 includes a main radiator 410 in a strip shape and a first parasitic radiator 420 in a strip shape. Specifically, the main radiator 410 and the first parasitic radiator 420 are both in a straight strip shape, that is, they are both extended in a straight line. Of course, it can be understood by those skilled in the art that in other alternative embodiments, the main radiator 410 and the first parasitic radiator 420 can also be in other shapes, not limited to the strip shape. When the strip structure is adopted, a bent strip structure can also be adopted, for example, an L-shaped strip structure, not limited to the straight strip structure.

[0183] The main radiator 410 is disposed on the first device body 200 and connected to the RF source 260 of the foldable electronic device 100, so that the RF signal emitted from the RF source 260 is directly fed or coupled to the main radiator 410 through the feeder line, and the RF source 260 is disposed on the main board 202 of the first device body 200. The first parasitic radiator 420 and the earpiece are disposed on the second device body 220.

[0184] In this embodiment, the main radiator 410 is arranged on the device body on the side where the main screen of the foldable electronic device 100 is located, and the first parasitic radiator 420 and the earpiece are arranged on the device body on the side where the secondary screen of the foldable electronic device 100 is located. Of course, those skilled in the art can understand that in other alternative embodiments, the main radiator 410 is arranged on the device body on the side where the secondary screen of the foldable electronic device 100 is located, and the first parasitic radiator 420 and the earpiece are arranged on the device body on the side where the main screen of the foldable electronic device 100 is located, which does not limit the protection scope of the present application.

[0185] When the foldable electronic device 100 is in the folded state, the main radiator 410 is laterally disposed opposite to the first parasitic radiator 420 with a first interval 450, and is coupled to the first parasitic radiator 420 through the first interval 450. Those skilled in the art can understand that the main radiator 410 and the first parasitic radiator 420 are laterally disposed opposite to each other, which means that one side of the main radiator 410 is disposed opposite to one side of the first parasitic radiator 420.

[0186] Specifically, the main radiator 410 has a first end 411 and a second end 412, and the first parasitic radiator 420 has a first end 421 and a second end 422. When the foldable electronic device 100 is in a folded state, the first end 411 of the main radiator 410 and the first end 421 of the first parasitic radiator 420 are correspondingly arranged, and the second end 412 of the main radiator 410 and the second end 422 of the first parasitic radiator 420 are correspondingly arranged.

[0187] Further, when the foldable electronic device 100 is in the folded state, the main radiator 410 and the first parasitic radiator 420 are arranged parallel to each other. The first end 411 of the main radiator 410 is aligned with the first end 421 of the first parasitic radiator 420, and the second end 412 of the main radiator 410 is aligned with the second end 422 of the first parasitic radiator 420.

[0188] Of course, it should be noted that the parallel setting can be roughly parallel, including the case where a small angle is formed (the angle can be ignored). In this embodiment, the main radiator 410 and the first parasitic radiator 420 are parallel to each other, and there can be a certain allowable tilt deviation. Alignment can be roughly aligned, including the case where one end is extended (the distance of the extension is almost negligible). In this embodiment, the first end 411 and the second end 412 of the main radiator 410 are respectively aligned with the first end 421 and the second end 422 of the first parasitic radiator 420, and there can be a certain allowable position offset. The above description of parallel setting and alignment applies to the entire scope of this application.

[0189] like Figure 3 As shown, the first switch control circuit 600 includes a first switch device 610 and a plurality of different first matching branches 620, 630 arranged in parallel. One end of the first switch device 610 forms one end 640 of the first switch control circuit, and the other end can be respectively selected to connect one end of the plurality of different first matching branches 620, 630, and the other ends of the plurality of different first matching branches 620, 630 jointly form the other end 650 of the first switch control circuit. In this embodiment, one end 640 of the first switch control circuit is connected to the ground of the second device body 220, specifically, to the floor 221 of the second device body 220 (see Figure 2), and the other end 650 of the first switch control circuit is connected to the first parasitic radiator 420. Those skilled in the art will appreciate that, in other alternative implementations, one end 640 of the first switch control circuit may also be connected to the first parasitic radiator 420, and the other end 650 of the first switch control circuit may be connected to the floor 221 of the second device body 220 (see Figure 2 ), which does not limit the protection scope of the present application. It can be understood by those skilled in the art that a floor is a type of ground, and the ground in this embodiment is illustrated by a floor.

[0190] The first switch device 610 switches between a plurality of different first matching branches 620 and 630 to adjust the resonant frequency of the first parasitic radiator 420. When the foldable electronic device is in the folded state, when the earpiece is in the closed state, the resonant frequency of the first parasitic radiator 420 and the resonant frequency of the main radiator 410 are within the first frequency band; when the earpiece is in the open state, the resonant frequency of the main radiator 410 is within the first frequency band, and the resonant frequency of the first parasitic radiator 420 is within the second frequency band, wherein the first frequency band and the second frequency band are different frequency bands (the first frequency band and the second frequency band do not overlap at all). The first frequency band is the operating frequency band of the main radiator 410. It can be understood by those skilled in the art that the operating frequency band of the main radiator 410 can be reasonably designed according to actual needs. That is to say, when the foldable electronic device is in a folded state, when the earpiece is in a closed state, the resonant frequency of the first parasitic radiator 420 is within the operating frequency band of the main radiator 410; when the earpiece is in an open state, the resonant frequency of the first parasitic radiator 420 is outside the operating frequency band of the main radiator 410.

[0191] When the resonant frequency of the first parasitic radiator 420 and the resonant frequency of the main radiator 410 are within the first frequency band, when the foldable electronic device 100 is in the folded state, the radiation energy of the main radiator 410 is coupled to the first parasitic radiator 420, so that the first parasitic radiator 420 radiates signals outward, that is, the first parasitic radiator 420 plays a parasitic radiation role on the main radiator 410, which can reduce the body SAR value, improve the efficiency of the antenna 400, and increase the transmission power of the antenna 400, thereby improving the antenna performance of the foldable electronic device 100 in a free space scene or a handheld scene when the foldable electronic device 100 is in the folded state. Among them, SAR (electromagnetic wave absorption ratio or specific absorption rate, the full name of English is "Specific Absorption Rate") refers to the electromagnetic power absorbed by a unit mass of human tissue, and the unit is W / kg. SAR values ​​are generally used internationally to measure the thermal effect of electronic device radiation. The body SAR value represents the average specific absorption rate of the body when the antenna is close to or in contact with the body.

[0192] When the resonant frequency of the main radiator 410 is within the first frequency band and the resonant frequency of the first parasitic radiator 420 is within the second frequency band, when the foldable electronic device 100 is in the folded state, the coupling degree between the radiation energy of the main radiator 410 and the first parasitic radiator 420 is very low, and even cannot be coupled to the first parasitic radiator 420, that is, the parasitic radiation effect of the first parasitic radiator 420 on the main radiator 410 is very weak, and even does not play a parasitic radiation effect on the main radiator 410. At this time, the first parasitic radiator 420 can couple the radiation energy of the antenna 400 to the antenna 400. The radiation of the main radiator 410 of the foldable electronic device 100 toward the direction of the first parasitic radiator 420 is blocked and isolated, so that when the antenna 400 is located at the top of the foldable electronic device 100, the head SAR value of the antenna 400 is reduced in the head-hand-held scenario, and the degree of attenuation of the radiation performance of the foldable electronic device 100 is reduced, that is, the head-hand-held degradation is reduced, thereby improving the radiation performance of the foldable electronic device 100 in the head-hand-held scenario, that is, improving the antenna performance in the head-hand-held scenario when the foldable electronic device 100 is in a folded state. The head SAR value represents the average specific absorption rate of the body when the antenna is close to or in contact with the head.

[0193] Those skilled in the art will understand that the head-hand holding scenario refers to a scenario where the electronic device is held close to or in contact with the head, such as a phone call scenario. The handheld scenario refers to a scenario where the electronic device is held in hand, such as a web page viewing scenario. The free space scenario refers to a scenario where the electronic device is in a free placement state, such as a scenario where it is freely placed on a platform (such as a table) or a mobile phone holder.

[0194] From another perspective, the resonant frequency of the first parasitic radiator 420 is adjusted by switching the first switch device 610 to one of the multiple different first matching branches 620, 630, so that the resonant frequency of the first parasitic radiator 420 is close to or away from the resonant frequency of the main radiator 410. When the resonant frequency of the first parasitic radiator 420 is close to the resonant frequency of the main radiator 410, when the foldable electronic device 100 is in the folded state, the radiation energy of the main radiator 410 is coupled to the first parasitic radiator 420. When the resonant frequency of the first parasitic radiator 420 is away from the resonant frequency of the main radiator 410, when the foldable electronic device 100 is in the folded state, the coupling degree of the radiation energy of the main radiator 410 with the first parasitic radiator 420 is very low, and it cannot even be coupled to the first parasitic radiator 420, that is, the parasitic radiation effect of the first parasitic radiator 420 on the main radiator 410 is very weak, and even does not play a parasitic radiation effect on the main radiator 410.

[0195] In this embodiment, the antenna 400 is arranged on the top of the foldable electronic device 100. At this time, the setting of the antenna 400 mainly meets the antenna performance of the foldable electronic device 100 in the head-hand-held scenario when it is in a folded state (including head SAR value, head-hand-held reduction), as well as the antenna performance in the handheld scenario and the free space scenario (including body SAR value and antenna transmission power).

[0196] Of course, it can be understood by those skilled in the art that, in other alternative embodiments, the antenna 400 can also be arranged at the bottom of the foldable electronic device 100. In this case, the setting of the antenna 400 mainly satisfies the antenna performance (including body SAR value and antenna transmission power) of the foldable electronic device 100 in the handheld scene and the free space scene when the foldable electronic device 100 is in the folded state. The antenna 400 can also be arranged on a side of the foldable electronic device 100 away from the rotating shaft 240. In this case, the setting of the antenna 400 mainly satisfies the antenna performance (including body SAR value and antenna transmission power, radiation performance) of the foldable electronic device 100 in the handheld scene (in this case, the antenna 400 is arranged at the side of the foldable electronic device 100 near the top to avoid the handheld position to ensure the radiation performance of the foldable electronic device 100 in the handheld scene), as well as the antenna performance (including body SAR value and antenna transmission power) in the free space scene and the horizontal placement scene.

[0197] The plurality of different first matching branches 620, 630 include two first matching branches 620, 630, and the two first matching branches 620, 630 respectively include a 0 ohm resistor (i.e., the resistance is 0 ohm) and an inductor, that is, one of the first matching branches 620 (i.e., the first sub-matching branch) includes a 0 ohm resistor, and the other first matching branch 630 (i.e., the second sub-matching branch) includes an inductor L1. Those skilled in the art can understand that the inductance value of the inductor L1 can be reasonably set according to actual needs.

[0198] When the first switching device 610 selects one of the first matching branches 620 (i.e., the first sub-matching branch) including a 0 ohm resistor, the resonant frequency of the first parasitic radiator 420 is within the second frequency band, and the first parasitic radiator 420 does not have a parasitic radiation effect on the main radiator 410. The first parasitic radiator 420 can block and isolate the radiation of the main radiator 410 of the antenna 400 toward the first parasitic radiator 420, so that when the antenna 400 is located on the top of the foldable electronic device 100, the head SAR value of the antenna 400 is reduced in the head-hand-held scenario, and the degree of attenuation of the radiation performance of the foldable electronic device 100 is reduced, that is, the head-hand-held degradation is reduced, thereby improving the radiation performance of the foldable electronic device 100 in the head-hand-held scenario.

[0199] When the first switching device 610 selects another first matching branch 630 (i.e., the second sub-matching branch) including the inductor L1, the resonant frequency of the first parasitic radiator 420 is within the first frequency band, and the first parasitic radiator 420 has a parasitic radiation effect on the main radiator 410, which can reduce the body SAR value, thereby improving the efficiency of the antenna, increasing the antenna's transmission power, and further improving the antenna performance of the foldable electronic device 100 in a free space scenario or a handheld scenario when the foldable electronic device 100 is in a folded state.

[0200] Those skilled in the art can understand that, in other alternative implementations, the plurality of different first matching branches can also include more than two first matching branches, not limited to two, and each first matching branch can include a 0 ohm resistor or inductor or capacitor. In other words, one of the two first matching branches can include a capacitor, and the other matching circuit includes an inductor, which does not limit the protection scope of the present application.

[0201] like Figure 3 As shown, the first switch device 610 adopts a single-pole multi-throw switch. In this embodiment, the first switch device 610 adopts a single-pole double-throw switch. Those skilled in the art will appreciate that in other alternative embodiments, the first switch device 610 may also adopt a double-pole double-throw switch.

[0202] In this embodiment, in the default state, the first switch device 610 is switched to another first matching branch 630 including the inductor L1. The trigger signal of the first switch device 610 switching from another first matching branch 630 including the inductor L1 to one of the first matching branches 620 including the 0-ohm resistor can be triggered by transmitting a signal of the earpiece being turned on (or the earpiece making a sound) on the second device body 220 to the processing device, or can be triggered by transmitting a signal detected by a proximity light sensor provided on the second device body 220 to the processing device.

[0203] That is to say, in a handheld scenario or a free space scenario, the first switching device 610 is selected to another first matching branch 630 including the inductor L1. At this time, the first parasitic radiator 420 has a parasitic radiation effect on the main radiator 410, which can reduce the body SAR value, thereby improving the efficiency of the antenna and increasing the transmission power of the antenna. In the head-hand-holding scenario, the head will approach the proximity light sensor, or the earpiece will be turned on, which can generate a trigger signal, so that the first switching device 610 is switched to one of the first matching branches 620 including a 0 ohm resistor. At this time, the first parasitic radiator 420 does not have a parasitic radiation effect on the main radiator 410, and the first parasitic radiator 420 can block and isolate the radiation of the main radiator 410 of the antenna 400 toward the direction of the first parasitic radiator 420 (that is, it can block, isolate and attenuate the radiation of the main radiator 410 of the antenna 400 toward the head), thereby reducing the head SAR value of the antenna and reducing the degree of attenuation of the radiation performance of the foldable electronic device 100, that is, reducing the head-hand-holding degradation, thereby improving the radiation performance of the foldable electronic device 100 in the head-hand-holding scenario.

[0204] In this embodiment, the operating frequency range of the antenna 400 is 1.7 GHz to 2.7 GHz, that is, in the medium and high frequency bands. It can be understood by those skilled in the art that in other alternative embodiments, the operating frequency range of the antenna 400 can also be other frequency bands, such as low frequency and ultra-high frequency, which does not limit the protection scope of this application.

[0205] like Figure 3 As shown, the second end 422 of the first parasitic radiator 420 is connected to the floor 221 of the second device body 220 (see Figure 2 ), the first parasitic radiator 420 has a first connection point 423, the first connection point 423 is located near the first end 421 of the first parasitic radiator 420, and the first connection point 423 is connected to the other end 650 of the first switch control circuit. The second end 412 of the main radiator 410 is connected to the ground of the first device body 200, specifically, connected to the floor 201 of the first device body 200, the main radiator 410 has a feeding point 413, the feeding point 413 is located near the first end 411 of the main radiator 410, and the feeding point 413 is connected to the RF source 260. Of course, those skilled in the art can understand that in other alternative embodiments, the first connection point 423 can also be connected to one end 640 of the first switch control circuit.

[0206] Furthermore, the distance between the feeding point 413 and the first end 411 of the main radiator 410 is 1.5 mm to 3 mm. The distance between the first connection point 423 and the first end 421 of the first parasitic radiator 420 is 1.5 mm to 3 mm. This can better meet the coupling requirements between the main radiator 410 and the first parasitic radiator 420.

[0207] Furthermore, the spacing of the first interval 450 is 2 mm to 4 mm, so as to ensure the coupling strength between the main radiator 410 and the first parasitic radiator 420 .

[0208] At the same time, the resonant frequency of the main radiator 410 is related to the length of the main radiator 410. The resonant frequency of the first parasitic radiator 420 is related to the length of the first parasitic radiator 420. As the length of the main radiator 410 changes, the resonant frequency of the main radiator 410 itself changes. As the length of the first parasitic radiator 420 changes, the resonant frequency of the first parasitic radiator 420 changes. Therefore, the lengths of the main radiator 410 and the first parasitic radiator 420 can be selected appropriately according to the antenna operating frequency band requirements.

[0209] Also, see Figure 3 The foldable electronic device further includes a main switch control circuit 500, which includes a main switch device 510 and a plurality of different main matching branches 520 and 530 arranged in parallel. One end of the main switch device 510 forms one end 540 of the main switch control circuit, and the other end can be respectively connected to one end of the plurality of different main matching branches 520 and 530, and the other ends of the plurality of different main matching branches 520 and 530 jointly form the other end 550 of the main switch control circuit.

[0210] In this embodiment, one end 540 of the main switch control circuit is connected to the floor 201 of the first device body 200 (see Figure 2 ), and the other end 550 of the main switch control circuit is connected between the RF source 260 and the feeding point 413 of the main radiator 410. Those skilled in the art will appreciate that, in other alternative implementations, one end 540 of the main switch control circuit may also be connected between the RF source 260 and the feeding point 413 of the main radiator 410, and the other end 550 of the main switch control circuit may be connected to the floor 201 of the first device body 200 (see Figure 2 ).

[0211] By switching the main switch device 510 to one of the multiple different main matching branches 520 and 530, the resonant frequency of the main radiator 410 is adjusted, so that the antenna 400 can cover different frequency bands.

[0212] Among them, the multiple different main matching branches 520, 530 include two main matching branches 520, 530, and the two main matching branches 520, 530 both include inductors, and the inductance values ​​of the two main matching branches 520, 530 are different. That is, one of the main matching branches 520 includes an inductor L01, and the other main matching branch 530 includes an inductor L02, and the inductance values ​​of the inductor L01 and the inductor L02 are different. Those skilled in the art can understand that the inductance values ​​of the inductor L01 and the inductor L02 can be reasonably set according to actual needs.

[0213] Those skilled in the art will appreciate that, in other alternative implementations, the plurality of different main matching branches may include more than two main matching branches, and is not limited to two, and each main matching branch may include a 0 ohm resistor or inductor or capacitor.

[0214] Specifically, the main switch device 510 uses a single-pole multi-throw switch. In this embodiment, the main switch device 510 uses a single-pole double-throw switch. Those skilled in the art will appreciate that in other alternative embodiments, the main switch device 510 may also use a double-pole double-throw switch.

[0215] See also Figure 3 The antenna 400 further includes a second parasitic radiator 430 in a strip shape. Specifically, the second parasitic radiator 430 is in a straight strip shape, that is, it extends in a straight line. Of course, it can be understood by those skilled in the art that in other alternative embodiments, the second parasitic radiator 430 can also be in a bent strip structure, for example, an L-shaped strip structure, and is not limited to a straight strip structure.

[0216] The second parasitic radiator 430 is disposed on the first device body 200. The second parasitic radiator 430 and the main radiator 410 are disposed end to end and spaced from each other longitudinally. The second parasitic radiator 430 has a first end 431 and a second end 432. The first end 431 of the second parasitic radiator 430 is relatively close to the first end 411 of the main radiator 410 and has a first gap 470. The second parasitic radiator 430 is coupled to the main radiator 410 through the first gap 470. The second end 432 of the second parasitic radiator 430 is relatively far away from the second end 412 of the main radiator 410 and is connected to the ground of the first device body 200, specifically, connected to the floor 201 (see FIG. 2 ) of the first device body 200. Figure 2). The second parasitic radiator 430 has a second connection point 433, and the second connection point 433 is located near the first end 431 of the second parasitic radiator 430. The second parasitic radiator 430 is coupled with the main radiator 410 through the first gap 470, which can further reduce the body SAR value, improve the efficiency of the antenna, and enhance the transmission power of the antenna. In this embodiment, the main radiator 410 and the second parasitic radiator 430 are arranged in a straight line. Of course, it should be noted that the straight line arrangement may be that the main part is in a straight line, or the adjacent parts are in a straight line, or a part of each of the two radiators is in a straight line. In this embodiment, the main radiator 410 and the second parasitic radiator 430 are in a straight line as a whole, and there may be a certain allowable error. And, this description is applicable to the entire scope of this application.

[0217] The foldable electronic device further includes a second switch control circuit 700, which includes a second switch device 710 and a plurality of second matching branches 720 and 730 connected in parallel. One end of the second switch device 710 forms one end 740 of the second switch control circuit, and the other end can be respectively connected to one end of the plurality of second matching branches 720 and 730, and the other ends of the plurality of second matching branches 720 and 730 jointly form the other end 750 of the second switch control circuit.

[0218] In this embodiment, one end 740 of the second switch control circuit is connected to the floor 201 of the first device body 200 (see Figure 2 ), and the other end 750 of the second switch control circuit is connected to the second connection point 433 of the second parasitic radiator 430. Those skilled in the art will appreciate that, in other alternative implementations, one end 740 of the second switch control circuit may also be connected to the second connection point 433 of the second parasitic radiator 430, and the other end 750 of the second switch control circuit may be connected to the floor 201 of the first device body 200 (see Figure 2 ).

[0219] The second switch device 710 is switched to one of the plurality of different second matching branches 720, 730 to adjust the resonant frequency of the second parasitic radiator 430. In this way, the resonant frequency of the second parasitic radiator 430 can be adjusted, so that the antenna can cover different frequency bands.

[0220] Specifically, the plurality of different second matching branches 720, 730 include two second matching branches 720, 730, both of which include inductors, and the inductance values ​​of the two second matching branches 720, 730 are different. That is, one of the second matching branches 720 includes an inductor L21, and the other second matching branch 730 includes an inductor L22, and the inductance values ​​of the inductor L21 and the inductor L22 are different. Those skilled in the art can understand that the inductance values ​​of the inductor L21 and the inductor L22 can be reasonably set according to actual needs.

[0221] Those skilled in the art will appreciate that, in other alternative implementations, the plurality of different second matching branches may include more than two second matching branches, and is not limited to two, and each second matching branch may include a 0 ohm resistor or inductor or capacitor.

[0222] Specifically, the second switch device 710 uses a single-pole multi-throw switch. In this embodiment, the second switch device 710 uses a single-pole double-throw switch. Those skilled in the art will appreciate that in other alternative embodiments, the second switch device 710 may also use a double-pole double-throw switch.

[0223] Furthermore, the distance between the second connection point 433 and the first end 431 of the second parasitic radiator 430 is 1.5 mm to 3 mm, which can better meet the coupling requirements between the main radiator 410 and the second parasitic radiator 430 .

[0224] Furthermore, the width of the first gap 470 is less than or equal to 2 mm, which can meet the appearance design requirements of the foldable electronic device 100. Of course, those skilled in the art can understand that the width of the first gap 470 can also be set to be greater than 2 mm according to actual needs.

[0225] See also Figure 3 , the antenna 400 also includes a third parasitic radiator 440 in a strip shape. Specifically, the third parasitic radiator 440 is in a straight strip shape, that is, it extends in a straight line. Of course, it can be understood by those skilled in the art that in other alternative embodiments, the third parasitic radiator 440 can also be in a structure of other shapes, not limited to a strip shape. When a strip structure is adopted, a bent strip structure can also be adopted, for example, an L-shaped strip structure, not limited to a straight strip structure. The third parasitic radiator 440 is arranged on the second device body 220, and the third parasitic radiator 440 and the first parasitic radiator 420 are arranged end to end longitudinally with a relative spacing. The third parasitic radiator 440 and the first parasitic radiator 420 are arranged in a straight line.

[0226] The third parasitic radiator 440 has a first end 441 and a second end 442. The first end 441 of the third parasitic radiator 440 is relatively close to the first end 421 of the first parasitic radiator 420 and has a second gap 480, that is, the second gap 480 is between the first end 441 of the third parasitic radiator 440 and the first end 421 of the first parasitic radiator 420. The second end 442 of the third parasitic radiator 440 is relatively far away from the second end 422 of the first parasitic radiator 420, and is connected to the ground of the second device body 220, specifically, connected to the floor 221 of the second device body 220 (see Figure 2 The third parasitic radiator 440 has a third connection point 443 , and the third connection point 443 is located near the first end 441 of the third parasitic radiator 440 .

[0227] When the foldable electronic device 100 is in the folded state, the third parasitic radiator 440 is arranged side by side with the second parasitic radiator 430 with the second interval 460, and is coupled with the second parasitic radiator 430 through the second interval 460. The third parasitic radiator 440 is coupled with the first parasitic radiator 420 through the second gap 480, and the third parasitic radiator 440 is also coupled with the main radiator 410. In this embodiment, when the foldable electronic device 100 is in the folded state, the third parasitic radiator 440 and the second parasitic radiator 430 are arranged parallel to each other. In addition, when the foldable electronic device 100 is in the folded state, the first end 441 of the third parasitic radiator 440 is aligned with the first end 431 of the second parasitic radiator 430, and the second end 442 of the third parasitic radiator 440 is aligned with the second end 432 of the second parasitic radiator 430.

[0228] Those skilled in the art may understand that the third parasitic radiator 440 may also be directly coupled to the main radiator 410 through a gap between the first end 411 of the main radiator 410 and the first end 441 of the third parasitic radiator 440 .

[0229] like Figure 3 As shown, the foldable electronic device further includes a third switch control circuit 800, which includes a third switch device 810 and a plurality of third matching branches 820 and 830 connected in parallel. One end of the third switch device 810 forms one end 840 of the third switch control circuit, and the other end can be respectively selected to connect one end of the plurality of third matching branches 820 and 830, and the other ends of the plurality of third matching branches 820 and 830 jointly form the other end 850 of the third switch control circuit.

[0230] In this embodiment, one end 840 of the third switch control circuit is connected to the floor 221 of the second device body 220 (see Figure 2), and the other end 850 of the third switch control circuit is connected to the third connection point 443 of the third parasitic radiator 440. Those skilled in the art can understand that, in other alternative implementations, one end 840 of the third switch control circuit is connected to the third connection point 443 of the third parasitic radiator 440, and the other end 850 of the third switch control circuit is connected to the floor 221 of the second device body 220.

[0231] The third switch device 810 is switched to one of the plurality of different third matching branches 820, 830 to adjust the resonant frequency of the third parasitic radiator 440. When the foldable electronic device is in the folded state, when the earpiece is in the closed state, the resonant frequency of the third parasitic radiator is within the first frequency band, that is, the resonant frequency of the third parasitic radiator is within the operating frequency band of the main radiator. When the earpiece is in the open state, the resonant frequency of the third parasitic radiator is within the second frequency band, that is, the resonant frequency of the third parasitic radiator is outside the operating frequency band of the main radiator.

[0232] When the third switch device 810 is selected to one of the third matching branches 820 (i.e., the third sub-matching branch), the parasitic radiation effect of the third parasitic radiator 440 on the main radiator 410 is very weak, or even does not have any parasitic radiation effect on the main radiator 410. At this time, the third parasitic radiator 440 can block and isolate the radiation of the main radiator 410 and the second parasitic radiator 430 of the antenna 400 toward the third parasitic radiator 440, so that when the antenna 400 is located on the top of the foldable electronic device 100, the head SAR value of the antenna is reduced in the head-hand-held scenario, and the degree of attenuation of the radiation performance of the foldable electronic device 100 is reduced, that is, the head-hand-held degradation is reduced, thereby improving the radiation performance of the foldable electronic device 100 in the head-hand-held scenario.

[0233] When the third switch device 810 is selected to another third matching branch 830 (i.e., the fourth sub-matching branch), the third parasitic radiator 440 performs parasitic radiation on the main radiator 410, which can reduce the body SAR value, improve the efficiency of the antenna, and increase the transmission power of the antenna, thereby improving the antenna performance of the foldable electronic device 100 in a free space scenario or a handheld scenario when the foldable electronic device 100 is in a folded state.

[0234] Specifically, the plurality of different third matching branches 820, 830 include two third matching branches 820, 830, and the two third matching branches 820, 830 respectively include a 0 ohm resistor (i.e., the resistance is 0 ohm) and an inductor. In other words, one of the third matching branches 820 includes a 0 ohm resistor, and the other third matching branch 830 includes an inductor L3. Those skilled in the art can understand that the inductance value of the inductor L3 can be reasonably set according to actual needs.

[0235] When the third switch device 810 switches on one of the third matching branches 820 including a 0-ohm resistor, the third parasitic radiator 440 does not perform parasitic radiation on the main radiator 410. When the third switch device 810 switches on another third matching branch 830 including an inductor L3, the third parasitic radiator 440 performs parasitic radiation on the main radiator 410.

[0236] Those skilled in the art can understand that, in other alternative implementations, the plurality of different third matching branches can also include more than two third matching branches, not limited to two, and each third matching branch can include a 0 ohm resistor or inductor or capacitor. In other words, one of the two third matching branches can include a capacitor, and the other third matching branch can include an inductor, which does not limit the protection scope of the present application.

[0237] like Figure 3 As shown, the third switch device 810 adopts a single-pole multi-throw switch. In this embodiment, the third switch device 810 adopts a single-pole double-throw switch. Those skilled in the art will appreciate that in other alternative embodiments, the third switch device 810 may also adopt a double-pole double-throw switch.

[0238] In this embodiment, in the default state, the third switch device 810 is switched to another third matching branch 830 including the inductor L3. The trigger signal of the third switch device 810 switching from another third matching branch 830 including the inductor L3 to one of the third matching branches 820 including the 0-ohm resistor can be triggered by transmitting a signal of the earpiece on the second device body 220 being turned on and emitting a sound to the processing device, or by transmitting a signal detected by a proximity light sensor provided on the second device body 220 to the processing device.

[0239] That is to say, in a handheld scenario or a free space scenario, the third switch device 810 is selected to another third matching branch 830 including the inductor L3. At this time, the third parasitic radiator 440 has a parasitic radiation effect on the main radiator 410, which can reduce the body SAR value, thereby improving the efficiency of the antenna and increasing the transmission power of the antenna. In the head-hand-holding scenario, the head will approach the proximity light sensor, or the earpiece will be turned on to make a sound, which can generate a trigger signal, so that the third switch device 810 is switched to one of the third matching branches 820 including a 0 ohm resistor. At this time, the third parasitic radiator 440 does not have a parasitic radiation effect on the main radiator 410, and the third parasitic radiator 440 can block and isolate the radiation of the main radiator 410 of the antenna 400 toward the direction of the first parasitic radiator 420 (that is, it can block, isolate and attenuate the radiation of the main radiator 410 of the antenna 400 toward the head), thereby reducing the head SAR value of the antenna and reducing the degree of attenuation of the radiation performance of the foldable electronic device 100, that is, reducing the head-hand-holding degradation, thereby improving the radiation performance of the foldable electronic device 100 in the head-hand-holding scenario.

[0240] Furthermore, the distance between the third connection point 443 and the first end 441 of the third parasitic radiator 440 is 1.5 mm to 3 mm, which can better meet the coupling requirement between the main radiator 410 and the third parasitic radiator 440 .

[0241] Furthermore, the distance of the second interval 460 is 2 mm to 4 mm. In this way, the coupling strength between the main radiator 410, the second parasitic radiator 430 and the third parasitic radiator 440 can be ensured. The width of the second gap 480 is less than or equal to 2 mm, which can meet the appearance design requirements of the foldable electronic device 100. Of course, those skilled in the art can understand that the width of the second gap 480 can also be set to be greater than 2 mm according to actual needs.

[0242] In this embodiment, the main switch control circuit 500 and the second switch control circuit 700 are integrated into the main board 202 of the first device body 200 , and the first switch control circuit 600 and the third switch control circuit 800 are integrated into the main board 222 of the second device body 220 .

[0243] In this embodiment, when the foldable electronic device 100 is in the folded state, the earpiece is opened and a first trigger signal is generated, the processing device controls the first switch device 610 to select one of the first matching branches 620 including a 0-ohm resistor in response to the first trigger signal, so that the resonant frequency of the first parasitic radiator 420 is within the second frequency band, and the resonant frequency of the main radiator 410 is within the first frequency band, that is, the resonant frequency of the first parasitic radiator 420 is outside the working frequency band of the main radiator 410, and at this time, the first parasitic radiator 420 does not play a parasitic radiation role on the main radiator 410. At the same time, the third switch device 810 is also controlled to select one of the third matching branches 820 including a 0-ohm resistor, so that the resonant frequency of the third parasitic radiator 440 is within the second frequency band, that is, the resonant frequency of the third parasitic radiator 440 is outside the working frequency band of the main radiator 410, and at this time, the third parasitic radiator 440 does not play a parasitic radiation role on the main radiator 410.

[0244] When the foldable electronic device 100 is in the folded state, the earpiece is closed and a second trigger signal is generated, the processing device controls the first switch device 610 to select another first matching branch 630 including the inductor L1 in response to the second trigger signal, so that the resonant frequency of the first parasitic radiator 420 and the resonant frequency of the main radiator 410 are within the first frequency band, that is, the resonant frequency of the first parasitic radiator 420 is within the working frequency band of the main radiator 410, at this time, the first parasitic radiator 420 plays a parasitic radiation role on the main radiator 410. At the same time, the third switch device 810 is also controlled to select another third matching branch 830 including the inductor L3, so that the resonant frequency of the third parasitic radiator 440 is within the first frequency band, that is, the resonant frequency of the third parasitic radiator 440 is within the working frequency band of the main radiator 410, at this time, the third parasitic radiator 440 plays a parasitic radiation role on the main radiator 410.

[0245] It should be noted that the first trigger signal and the second trigger signal can be converted into signals that can be recognized by the processing device.

[0246] It should be noted that examples of processing devices include, but are not limited to, processors, application specific integrated circuits (ASICs), etc., and / or any combination thereof. According to one aspect, the processor may be a microprocessor, a digital signal processor, a microcontroller, etc., and / or any combination thereof. According to another aspect, the processor may be a single-core processor, a multi-core processor, etc., and / or any combination thereof.

[0247] Of course, those skilled in the art can understand that, in other alternative embodiments, the foldable electronic device can be additionally provided with a trigger device, and the trigger signal generated by the trigger device controls the gating state of the first switch device 610 and the third switch device 810. In this case, the first trigger signal and the second trigger signal are generated by the trigger device instead of the earpiece.

[0248] The trigger device may be a proximity light sensor, an ambient light sensor, or a distance sensor. When the user's head is close to the proximity light sensor, the ambient light sensor, or the distance sensor, the sensor may generate a first trigger signal, and when the user's head is away from the sensor, the sensor may generate a second trigger signal.

[0249] In this embodiment, the main radiator 410, the first parasitic radiator 420, the second parasitic radiator 430 and the third parasitic radiator 440 can be formed by the metal frame of the foldable electronic device 100, or can be a metal sheet (such as a steel sheet), or can be a flexible printed circuit (Flexible Printed Circuit FPC), or can be formed in the form of LDS (Laser Direct Structuring). The main radiator 410, the first parasitic radiator 420, the second parasitic radiator 430 and the third parasitic radiator 440 are formed by the metal frame at the top of the foldable electronic device 100, and the earpiece is located at the top of the foldable electronic device 100. In the folded state, the earpiece is close to the four radiators of the main radiator 410, the first parasitic radiator 420, the second parasitic radiator 430 and the third parasitic radiator 440.

[0250] Those skilled in the art may understand that, when the working state of the antenna is additionally controlled by a trigger device, and the trigger device is a proximity light sensor, an ambient light sensor, or a distance sensor, in the folded state, the sensor used is close to the positions of the four radiators, namely the main radiator 410, the first parasitic radiator 420, the second parasitic radiator 430, and the third parasitic radiator 440.

[0251] The floor 201 of the first device body 200 and the floor 221 of the second device body 220 may be formed by the bottom plate of the middle frame of the foldable electronic device 100. Those skilled in the art may understand that in other alternative embodiments, the floor may also be formed by other metal parts, such as a printed circuit board.

[0252] Different states can be achieved by switching different matchings between the first switch device 610, the second switch device 710, and the third switch device 810. By switching to different main matching circuits through the main switch device 510, the matching impedance of the antenna is adjusted, that is, it is mainly to optimize the impedance matching in each state. The state is related to the position of the radiator, the length of the radiator, the direction of the radiator, the feeder and the surrounding environment. When the first switch device 610 is connected in series with an inductor, the resonant frequency of the first parasitic radiator 420 corresponding to the first switch device 610 shifts upward, and the larger the inductance, the more it shifts upward. When the first switch device 610 is connected in series with a capacitor, the resonant frequency of the first parasitic radiator 420 corresponding to the first switch device 610 shifts downward, and the larger the capacitance, the more it shifts downward. When the second switch device 710 is connected in series with an inductor, the resonant frequency of the second parasitic radiator 430 corresponding to the second switch device 710 shifts upward, and the larger the inductance, the more the shift upward. When the second switch device 710 is connected in series with a capacitor, the resonant frequency of the second parasitic radiator 430 corresponding to the second switch device 710 shifts downward, and the larger the capacitance, the more the shift downward. When the third switch device 810 is connected in series with an inductor, the resonant frequency of the third parasitic radiator 440 corresponding to the third switch device 810 shifts upward, and the larger the inductance, the more the shift upward. When the third switch device 810 is connected in series with a capacitor, the resonant frequency of the third parasitic radiator 440 corresponding to the third switch device 810 shifts downward, and the larger the capacitance, the more the shift downward.

[0253] The following combination Figure 4a to Figure 10c The antenna performance in foldable electronic devices is specifically described.

[0254] In order to verify the performance of the antenna in the embodiment of the present application, the full-wave electromagnetic simulation software HFSS was used for simulation analysis, and the obtained Figure 4a to Figure 10c Simulation effect diagram.

[0255] Get Figure 4a to Figure 10c The simulation conditions of the simulation effect diagram shown in Table 1 are shown below (please refer to Figure 3 Understand):

[0256] Table 1

[0257]

[0258]

[0259] Combination Figure 3 It is understood that the following simulation test is performed by switching the main switch device 510, the first switch device 610, the second switch device 710, and the third switch device 810, taking the antenna in two states as an example, and obtaining Figure 4a to Figure 6 The simulation effect diagram is shown.

[0260] State 1: the main switch device 510 switches to another main matching branch 530 of the inductor L02 with an inductance value of 4nH, the first switch device 610 switches to another first matching branch 630 of the inductor L1 with an inductance value of 10nH, the second switch device 710 switches to another second matching branch 730 of the inductor L22 with an inductance value of 2nH, and the third switch device 810 switches to another third matching branch 830 of the inductor L3 with an inductance value of 15nH. In state 1, the first parasitic radiator 420, the second parasitic radiator 430 and the third parasitic radiator 440 all play a parasitic radiation role on the main radiator 410.

[0261] State 2: the main switch device 510 switches to one of the main matching branches 520 of the inductor L01 with an inductance value of 15 nH, the first switch device 610 switches to one of the first matching branches 620 with an inductance value of 0 ohm, the second switch device 710 switches to one of the second matching branches 720 of the inductor L21 with an inductance value of 8 nH, and the third switch device 810 switches to one of the third matching branches 820 with an inductance value of 0 ohm. In state 2, the second parasitic radiator 430 performs parasitic radiation on the main radiator 410, but the first parasitic radiator 420 and the third parasitic radiator 440 do not perform parasitic radiation on the main radiator 410.

[0262] See also Figure 4a to Figure 5b , Figure 4a to Figure 4b The local current distribution diagram of the antenna and the local magnetic field distribution diagram of the antenna in state 1 are obtained when the foldable electronic device of Example 1 of the present application is in a folded state and a simulation effect test is performed. Figure 5a to Figure 5b The local current distribution diagram of the antenna and the local magnetic field distribution diagram of the antenna in state 2 are obtained when the foldable electronic device of Example 1 of the present application is in a folded state and undergoes a simulation effect test. The operating frequency range of the antenna is 1.7 GHz to 1.9 GHz, for example, the operating frequency of the antenna is 1.8 GHz. Figure 4a to Figure 5b The X direction is parallel to the lateral direction of the foldable electronic device, and the Z direction is parallel to the thickness direction of the foldable electronic device.

[0263] exist Figure 4a and Figure 5a In the figure, the arrow indicates the direction of the current on the corresponding radiator. Figure 4a As shown, the currents generated on the main radiator, the first parasitic radiator, the second parasitic radiator and the third parasitic radiator of the antenna are distributed in the same direction, and the current of the antenna is dispersed in the X direction and the Z direction at the same time. Figure 4b As shown, the magnetic field radiation area of ​​the antenna is also dispersed into four areas, such as the areas shown by the dotted boxes in the figure, that is, the four areas where the main radiator, the first parasitic radiator, the second parasitic radiator and the third parasitic radiator of the antenna are located.

[0264] like Figure 5a As shown, the current generated by the second parasitic radiator is in the same direction as the current generated by the main radiator, and the currents generated by the first parasitic radiator and the third parasitic radiator are in the opposite direction to the current generated by the main radiator. Figure 5b As shown in the figure, the magnetic field radiation area of ​​the antenna is also dispersed into two areas, such as the area shown in the dotted box in the figure, that is, the two areas where the main radiator of the antenna and the second parasitic radiator are located. In other words, adding the second parasitic radiator disperses the current and magnetic field radiation area of ​​the antenna in the X direction, increases the radiation area of ​​the antenna, thereby improving the antenna efficiency and reducing the bodySAR value.

[0265] From the above, it can be seen that when the antenna is in state 1, compared with working in state 2, adding the first parasitic radiator and the third parasitic radiator can disperse the antenna current and the magnetic field radiation area of ​​the antenna, which is equivalent to increasing the width of the main radiator of the antenna and increasing the radiation area of ​​the antenna, thereby improving the antenna efficiency and reducing the body SAR value.

[0266] See also Figure 6 , Figure 6 This is a curve diagram comparing the radiation efficiency and system efficiency of the antenna in the free space scenario and the head left hand holding scenario obtained during the simulation effect test of the foldable electronic device of Example 1 of the present application. Figure 6 , the horizontal axis represents the frequency in GHz, and the vertical axis represents the radiation efficiency and system efficiency of the antenna in dB. The radiation efficiency of the antenna is a measure of the radiation capability of the antenna. The losses caused by metal loss and dielectric loss affect the radiation efficiency. The system efficiency of the antenna is the actual efficiency after considering the matching of the antenna port, that is, the system efficiency of the antenna is the actual efficiency of the antenna (that is, the efficiency). Those skilled in the art can understand that efficiency is generally expressed in percentage, and there is a corresponding conversion relationship between it and dB. The closer the efficiency is to 0dB, the better.

[0267] Figure 6The curves "HEAD LEFT 1" and "HEAD LEFT 2" in the figure respectively represent the curves of the radiation efficiency and system efficiency of the antenna in state 1 when simulating the test head left hand holding scenario as a function of frequency. The curves "FS 1" and "FS 2" respectively represent the curves of the radiation efficiency and system efficiency of the antenna in state 1 when simulating the free space scenario as a function of frequency. The curves "HEAD LEFT 3" and "HEAD LEFT 4" respectively represent the curves of the radiation efficiency and system efficiency of the antenna in state 2 when simulating the test head left hand holding scenario as a function of frequency. The curves "FS 3" and "FS 4" respectively represent the curves of the radiation efficiency and system efficiency of the antenna in state 2 when simulating the free space scenario as a function of frequency.

[0268] FS stands for Free Space, which means that the FS scene is a Free Space scene. The scene where the head is held with the left hand is the BHHL (Beside Head Hand Left) scene. The scene where the head is held with the hand is the BHH (Beside Head Hand) scene. The scene where the head is held with the right hand is the BHHR (Beside Head Hand Right) scene.

[0269] from Figure 6 It can be seen that in state 1 (i.e., the first and third parasitic radiators act as parasitic radiation on the main radiator), when simulating the left-hand holding scenario of the test head, the maximum value of the antenna's system efficiency (i.e., efficiency) is -7.3dB, and the antenna's operating frequency is 1.7GHz. In state 1, when simulating the free space scenario, the maximum value of the antenna's system efficiency (i.e., efficiency) is -1dB, and the antenna's operating frequency is 1.69GHz (about 1.7GHz). In other words, in state 1, the maximum value of the antenna's system efficiency (i.e., efficiency) is reduced by 6.3dB in the simulation test head left-hand holding scenario relative to the free space scenario, that is, the head hand holding decreases by 6.3dB.

[0270] In state 2 (i.e., the first parasitic radiator and the third parasitic radiator do not have a parasitic radiation effect on the main radiator), when simulating the test head left hand holding scenario, the maximum value of the antenna system efficiency (i.e., efficiency) is -6.6dB, and the antenna operating frequency is 1.75GHz. In state 2, when simulating the test free space scenario, the maximum value of the antenna system efficiency (i.e., efficiency) is -2.7dB, and the antenna operating frequency is 1.74GHz (about 1.75GHz). That is to say, in state 2, the maximum value of the antenna system efficiency (i.e., efficiency) is reduced by 3.9dB in the simulation test head left hand holding scenario relative to the free space scenario, that is, the head hand holding decreases by 3.9dB.

[0271] From the above, it can be seen that when simulating the test head hand-held scenario, the maximum value of the antenna's system efficiency (i.e., efficiency) is reduced by 0.7dB in state 1 relative to state 2. When simulating the test free space scenario, the maximum value of the antenna's system efficiency (i.e., efficiency) is increased by 1.7dB in state 1 relative to state 2. In other words, when the antenna is in state 1 and used in a free space scenario, the antenna's efficiency will be better, that is, when the foldable electronic device is in a free space scenario, the antenna is in state 1, and its antenna efficiency is greatly improved. In state 2, relative to state 1, the head hand-held drop is reduced from 6.3dB to 3.9dB, that is, when the antenna is in state 2, the head hand-held drop is relatively low, that is, the radiation performance attenuation of the foldable electronic device is reduced.

[0272] Please refer to Table 2 below, which shows the antenna performance related parameters in the free space scenario and the head left hand holding scenario obtained in State 1 and State 2 when the foldable electronic device of Example 1 of the present application is subjected to the simulation effect test. Among them, the conducted power is 24dBm, which means that the input power of the antenna is set to 24dBm. "HEAD SAR (normalized to -5dB)" indicates the head SAR value measured when the efficiency of the antenna is normalized to -5dB. "5mm Body SAR (normalized to -5dB)" indicates the body SAR value measured when the efficiency of the antenna is normalized to -5dB. The 5mm Body SAR value indicates the average specific absorption rate of the body when the foldable electronic device is 5mm away from the body.

[0273] Among them, FS represents the free space scenario, BHHL represents the head-left hand holding scenario, and head-hand reduction represents the head-hand holding reduction. After calculating SAR (0.5), head-hand touch (OTA) represents the transmission power of the foldable electronic device in the head-hand holding scenario when the head SAR value is guaranteed to be 0.5W / kg. OTA (Over The Air) represents the test of the radiation performance of the entire electronic device. After calculating body SAR (0.9), hand touch (OTA) represents the transmission power of the foldable electronic device in the handheld scenario when the body SAR value is guaranteed to be 0.9W / kg.

[0274] As can be seen from Table 2 below, in state 1 (i.e., the first parasitic radiator and the third parasitic radiator play a parasitic radiation role on the main radiator), when the simulation test is performed in the left hand holding scenario, the head SAR value is 0.7 W / kg. In state 2 (i.e., the first parasitic radiator and the third parasitic radiator do not play a parasitic radiation role on the main radiator), when the simulation test is performed in the left hand holding scenario, the head SAR value is 0.43 W / kg. That is to say, in the left hand holding scenario, the antenna is in state 2 relative to state 1, and the head SAR value is reduced from 0.7 W / kg to 0.43 W / kg, that is, the head SAR value is reduced.

[0275] In state 1 (i.e., the first and third parasitic radiators act as parasitic radiation on the main radiator), when simulating the free space scene, the body SAR value is 1.2W / kg. In state 2 (i.e., the first and third parasitic radiators do not act as parasitic radiation on the main radiator), when simulating the free space scene, the head SAR value is 1.8W / kg. That is, in the free space scene, the head SAR value is reduced from 1.8W / kg to 1.2W / kg when the antenna is in state 1 relative to state 2, that is, the body SAR value is reduced.

[0276] Table 2

[0277]

[0278] In order to more specifically illustrate the influence of the first parasitic radiator and the third parasitic radiator on the antenna performance, Figure 3 It is understood that the following simulation test is performed by switching the first switch device 610 and the third switch device 810 with the antenna in three states as an example, and the Figure 7a to Figure 10c The simulation effect diagram is shown.

[0279] State 1: The first switch device 610 switches to one of the first matching branches 620 with 0 ohm, and the third switch device 810 switches to one of the third matching branches 820 with 0 ohm. The main switch device 510 switches to one of the main matching branches 520 of the inductor L01 with an inductance value of 15 nH, and the second switch device 710 switches to one of the second matching branches 720 of the inductor L21 with an inductance value of 8 nH. In state 1, only the second parasitic radiator 430 plays a parasitic radiation role on the main radiator 410, but the first parasitic radiator 420 and the third parasitic radiator 440 do not play a parasitic radiation role on the main radiator 410.

[0280] State 2: The first switch device 610 switches to another first matching branch 630 of the inductor L1 with an inductance value of 10 nH, and the third switch device 810 switches to one of the third matching branches 820 with an inductance value of 0 ohm. The main switch device 510 switches to one of the main matching branches 520 of the inductor L01 with an inductance value of 15 nH, and the second switch device 710 switches to one of the second matching branches 720 of the inductor L21 with an inductance value of 8 nH. In state 2, only the second parasitic radiator 430 and the first parasitic radiator 420 play a parasitic radiation role on the main radiator 410, but the third parasitic radiator 440 does not play a parasitic radiation role on the main radiator 410.

[0281] State 3: The first switch device 610 switches to another first matching branch 630 of the inductor L1 with an inductance value of 10nH, and the third switch device 810 switches to another third matching branch 830 of the inductor L3 with an inductance value of 15nH. The main switch device 510 switches to another main matching branch 530 of the inductor L02 with an inductance value of 4nH, and the second switch device 710 switches to another second matching branch 730 of the inductor L22 with an inductance value of 2nH. In state 3, the first parasitic radiator 420, the second parasitic radiator 430 and the third parasitic radiator 440 all play a parasitic radiation role on the main radiator 410.

[0282] See also Figure 7a to Figure 7c , Figure 7a to Figure 7c The efficiency curve of the antenna obtained by simulating and testing the free space scene under three different simulation conditions. Figure 7a The efficiency effect curve of the antenna obtained in state 1 is shown. Figure 7b The efficiency effect curve of the antenna obtained in state 2 is shown. Figure 7c The figure shows the efficiency effect curve of the antenna obtained in state 3.

[0283] like Figure 7a As shown in the figure, the two curves in the figure respectively represent the curves of the radiation efficiency and system efficiency of the antenna when simulating the free space scenario in state 1 and changing with the frequency. Figure 7a It can be seen that when simulating the free space scenario in state 1, when the antenna's operating frequency is 1.92 GHz, the antenna's system efficiency (i.e., efficiency) is -3.6645 dB. When the antenna's operating frequency is 1.98 GHz, the antenna's system efficiency (i.e., efficiency) is -3.2165 dB.

[0284] like Figure 7b As shown in the figure, the two curves in the figure respectively represent the curves of the radiation efficiency and system efficiency of the antenna when simulating the free space scenario in state 2 and changing with the frequency. Figure 7b It can be seen that when simulating the free space scenario in state 2, when the antenna's operating frequency is 1.85 GHz, the antenna's system efficiency (i.e., efficiency) is -2.2704 dB. When the antenna's operating frequency is 1.92 GHz, the antenna's system efficiency (i.e., efficiency) is -2.2451 dB.

[0285] like Figure 7c As shown in the figure, the two curves in the figure respectively represent the curves of the radiation efficiency and system efficiency of the antenna when simulating the free space scenario under state 3 and changing with the frequency. Figure 7cIt can be seen that when simulating the free space scenario in state 3, when the antenna's operating frequency is 1.78 GHz, the antenna's system efficiency (i.e., efficiency) is -2.2776 dB. When the antenna's operating frequency is 1.85 GHz, the antenna's system efficiency (i.e., efficiency) is -1.7971 dB.

[0286] From the above, it can be seen that, relative to state 1, state 2, i.e., when the second parasitic radiator plays a parasitic radiation role on the main radiator, after adding the parasitic radiation role of the first parasitic radiator on the main radiator, when the working frequency of the antenna is 1.92GHz, the system efficiency (i.e., efficiency) of the antenna is improved by 1.4194dB. Relative to state 2, state 3, i.e., after the first and second parasitic radiators play a parasitic radiation role on the main radiator, the parasitic radiation role of the third parasitic radiator on the main radiator is further added, when the working frequency of the antenna is 1.85GHz, the system efficiency (i.e., efficiency) of the antenna can be further improved by 0.4733dB. In other words, after the first parasitic radiator and the third parasitic radiator play a parasitic radiation role on the main radiator, the system efficiency of the antenna can be improved.

[0287] See also Figure 8a to Figure 10c , Figure 8a to Figure 8c Schematic diagram of local current distribution of the antenna in state 1, state 2 and state 3. Figure 9a to Figure 9c The local magnetic field distribution diagram of the antenna obtained in state 1, state 2 and state 3. Figure 10a to Figure 10c The antenna hotspot distribution diagram obtained in state 1, state 2 and state 3. The hotspot represents the area radiated by the antenna, and the SAR value is the maximum value in the hotspot. The operating frequency range of the antenna is 1.7 GHz to 1.9 GHz, for example, the operating frequency of the antenna is 1.8 GHz. Figure 8a to Figure 10c The X direction is parallel to the lateral direction of the foldable electronic device, and the Z direction is parallel to the thickness direction of the foldable electronic device.

[0288] exist Figure 8a to Figure 8c In the figure, the arrow indicates the direction of the current on the corresponding radiator. Figure 8a As shown, in state 1, the current generated by the second parasitic radiator is in the same direction as the current generated by the main radiator, and the currents generated by the first parasitic radiator and the third parasitic radiator are in the opposite direction to the current generated by the main radiator. Figure 8b As shown, in state 2, the currents generated by the first parasitic radiator and the second parasitic radiator are in the same direction as the current generated by the main radiator, and the current generated by the third parasitic radiator is in the opposite direction to the current generated by the main radiator. Figure 8c As shown, in state 3, the currents generated on the main radiator, the first parasitic radiator, the second parasitic radiator and the third parasitic radiator of the antenna are distributed in the same direction, and the current of the antenna is dispersed in the X direction and the Z direction at the same time.

[0289] like Figure 9a As shown in Figure 1, in state 1, the magnetic field radiation area of ​​the antenna is dispersed into two areas, such as the area shown by the dotted box in the figure, that is, the two areas where the main radiator and the second parasitic radiator of the antenna are located. Figure 9b As shown in FIG. 2 , in state 2, the magnetic field radiation area of ​​the antenna is dispersed into three areas, such as the area shown in the dotted box in the figure, that is, the three areas where the main radiator, the first parasitic radiator, and the second parasitic radiator of the antenna are located. Fig.9c As shown, in state 3, the magnetic field radiation area of ​​the antenna is also dispersed into four areas, such as the areas shown by the dotted boxes in the figure, that is, the four areas where the main radiator, the first parasitic radiator, the second parasitic radiator and the third parasitic radiator of the antenna are located.

[0290] It can be seen from the above that adding the first parasitic radiator and / or the third parasitic radiator can disperse the antenna current and the magnetic field radiation area of ​​the antenna, which is equivalent to increasing the width of the main radiator of the antenna and increasing the radiation area of ​​the antenna, thereby improving the antenna efficiency and reducing the body SAR value.

[0291] like Figure 10a to Figure 10c As shown, Fig.10a The hot spots of the middle antenna are the most concentrated. Fig.10c Therefore, after the first parasitic radiator and the third parasitic radiator play a parasitic radiation role on the main radiator, the hot spots of the antenna can be more dispersed, thereby reducing the body SAR value.

[0292] Please refer to Table 3 below, which shows the antenna performance related parameters in the free space scenario obtained in State 1, State 2 and State 3. In the figure, "Parasitic 2" means in State 1, that is, only the second parasitic radiator plays a parasitic radiation role on the main radiator. "Parasite 1+Parasite 2" means in State 2, that is, the first parasitic radiator and the second parasitic radiator play a parasitic radiation role on the main radiator. "Parasite 1+Parasite 2+Parasite 3" means in State 3, that is, the first parasitic radiator, the second parasitic radiator and the third parasitic radiator play a parasitic radiation role on the main radiator. 1g means that the biological tissue fluid has a unit volume size of 1g (equivalent to 1cm 3 ) standard. 10g means that the biological tissue fluid is measured in 10g unit volume (equivalent to 10cm 3 ) standards for testing.

[0293] “head SAR” indicates the head SAR value. “Normalized head SAR” indicates the head SAR value measured when the efficiency of the antenna is normalized to -5dB. “Normalized 5mm body SAR” indicates the body SAR value measured when the efficiency of the antenna is normalized to -5dB. “right head touch” indicates the scenario where the right side of the head touches the foldable electronic device. “left head touch” indicates the scenario where the left side of the head touches the foldable electronic device. “5mm backside” indicates the scenario where the back of the foldable electronic device is 5mm away from the body. “0mm backside” indicates the scenario where the back of the foldable electronic device touches the body. “5mmbottomside” indicates the scenario where the bottom of the foldable electronic device is 5mm away from the body. “0mm bottomside” indicates the scenario where the bottom of the foldable electronic device touches the body. “5mm topside” indicates the scenario where the top of the foldable electronic device is 5mm away from the body. “0mm topside” indicates the scenario where the top of the foldable electronic device touches the body.

[0294] It can be seen from the following Table 3 that in state 1, in a free space scenario, when the top of the foldable electronic device is 5 mm away from the body, the body SAR value is 1.62 W / kg when the antenna's operating frequency is 1.92 GHz; and the body SAR value is 1.85 W / kg when the antenna's operating frequency is 1.98 GHz. In state 2, in a free space scenario, when the top of the foldable electronic device is 5 mm away from the body, the body SAR value is 1.33 W / kg when the antenna's operating frequency is 1.85 GHz; and the body SAR value is 1.53 W / kg when the antenna's operating frequency is 1.92 GHz. In state 3, in a free space scenario, when the top of the foldable electronic device is 5 mm away from the body, the body SAR value is 1.31 W / kg when the antenna's operating frequency is 1.78 GHz; and the body SAR value is 1.21 W / kg when the antenna's operating frequency is 1.85 GHz.

[0295] It can be seen that adding the first parasitic radiator plays a parasitic radiation role on the main radiator, and when the antenna operating frequency is 1.85GHz, the body SAR value can be reduced to 1.33W / kg, and when the antenna operating frequency is 1.92GHz, the body SAR value can be reduced to 1.53W / kg. Adding the first parasitic radiator and the third radiator at the same time plays a parasitic radiation role on the main radiator, and when the antenna operating frequency is 1.78GHz, the body SAR value can be reduced to 1.31W / kg, and when the antenna operating frequency is 1.85GHz, the body SAR value can be reduced to 1.21W / kg.

[0296] Table 3

[0297]

[0298] Example 2

[0299] See also Fig.11 , Fig.11 Schematic diagram of the structure of the antenna 400A of the foldable electronic device in the folded state of the foldable electronic device of the second embodiment of the present application. The structure of the foldable electronic device in this embodiment is basically the same as the structure of the foldable electronic device in the first embodiment, except that the structure of the antenna 400A of the foldable electronic device is different. Specifically, the antenna 400A includes a main radiator 410A, a first parasitic radiator 420A, a second parasitic radiator 430A and an isolation portion 440A. The main radiator 410A and the first parasitic radiator 420A are arranged on the first device body (not shown in the figure), and the second parasitic radiator 430A, the isolation portion 440A and the earpiece are arranged on the second device body (not shown in the figure). The main radiator 410A is connected to the RF source 260A of the foldable electronic device, so that the RF signal emitted from the RF source 260A is directly fed or coupled to the main radiator 410A through the feeder line.

[0300] Among them, the main radiator 410A, the first parasitic radiator 420A, the second parasitic radiator 430A and the isolation part 440A are all in a strip shape and have a first end and a second end. Specifically, the main radiator 410A, the first parasitic radiator 420A, the second parasitic radiator 430A and the isolation part 440A are all in a straight strip shape, that is, they all extend in a straight line. The main radiator 410A has a first end 411A and a second end 412A, the first parasitic radiator 420A has a first end 421A and a second end 422A, the second parasitic radiator 430A has a first end 431A and a second end 432A, and the isolation part 440A has a first end 441A and a second end 442A. Of course, those skilled in the art will appreciate that, in other alternative embodiments, the main radiator 410A, the first parasitic radiator 420A, the second parasitic radiator 430A and the isolation portion 440A may also be in the form of a bent strip structure, for example, an L-shaped strip structure, and are not limited to a straight strip structure.

[0301] The main radiator 410A and the first parasitic radiator 420A are arranged end to end and spaced relative to each other longitudinally. Specifically, the main radiator 410A and the first parasitic radiator 420A are arranged in a straight line. The first end 411A of the main radiator 410A is connected to the ground of the first device body, specifically, to the floor of the first device body (not shown in the figure). The main radiator 410A has a feeding point 413A, which is located at a position close to the second end 412A of the main radiator 410A, and the feeding point 413A is connected to the RF source 260A. The second end 412A of the main radiator 410A is relatively close to the first end 421A of the first parasitic radiator 420A and has a gap 470A, and the main radiator 410A is coupled to the first parasitic radiator 420A through the gap 470A. The second end 422A of the first parasitic radiator 420A is relatively far from the first end 411A of the main radiator 410A, and is connected to the ground of the first device body, specifically, to the floor of the first device body (not shown in the figure). Those skilled in the art can understand that the floor is a kind of ground, and the ground in this embodiment is illustrated by the floor.

[0302] In addition, the isolation part 440A and the first parasitic radiator 420A are arranged in a straight line. The first end 441A and the second end 442A of the isolation part 440A are respectively connected to the ground of the second device body, specifically, connected to the floor of the second device body, the second end 442A of the isolation part 440A is connected to the first end 431A of the second parasitic radiator 430A, and the second end 432A of the second parasitic radiator 430A is a free end.

[0303] When the foldable electronic device is in a folded state, the isolation portion 440A is laterally spaced from the main radiator 410A and the first parasitic radiator 420A. In the length direction of the first parasitic radiator 420A, the first end 431A of the second parasitic radiator 430A is flush with the second end 422A of the first parasitic radiator 420A, and the second parasitic radiator 430A is coupled to the first parasitic radiator 420A. Of course, it can be understood by those skilled in the art that in other alternative embodiments, in the length direction of the first parasitic radiator 420A, the first end 431A of the second parasitic radiator 430A can also be located between the second end 422A and the first end 421A of the first parasitic radiator 420A, and close to the second end 422A of the first parasitic radiator 420A. Those skilled in the art will appreciate that the isolation portion 440A being laterally spaced apart from the main radiator 410A and the first parasitic radiator 420A respectively means that one side of the isolation portion 440A is disposed opposite to one side of the main radiator 410A and one side of the first parasitic radiator 420A respectively.

[0304] When the foldable electronic device is in a folded state, the isolation portion 440A is respectively arranged parallel to the main radiator 410A and the first parasitic radiator 420A, and the second parasitic radiator 430A is arranged parallel to the first parasitic radiator 420A. The first end 441A of the isolation portion 440A is aligned with the first end 411A of the main radiator 410A.

[0305] In this embodiment, the isolation portion 440A can block and isolate the radiation of the main radiator 410A and the first parasitic radiator 420A of the antenna 400A toward the isolation portion 440A, thereby reducing the head SAR value of the antenna in a head-hand-held scenario when the antenna 400A is located on the top of the foldable electronic device, and reducing the degree of attenuation of the radiation performance of the foldable electronic device, that is, reducing the head-hand-held degradation, thereby improving the radiation performance of the foldable electronic device in the head-hand-held scenario, that is, improving the antenna performance in the head-hand-held scenario when the foldable electronic device is in a folded state.

[0306] In addition, the first parasitic radiator 420A is coupled with the main radiator 410A, and the second parasitic radiator 430A is coupled with the first parasitic radiator 420A, which reduces the body SAR value, improves the efficiency of the antenna, and increases the transmission power of the antenna, thereby improving the antenna performance of the foldable electronic device in a free space scenario or a handheld scenario when the foldable electronic device is in a folded state.

[0307] Furthermore, the distance between the feeding point 413A and the second end 412A of the main radiator 410A is 1.5 mm to 3 mm, which can better meet the coupling requirement between the main radiator 410A and the first parasitic radiator 420A.

[0308] In addition, the width of the gap 470A is less than or equal to 2 mm, which can meet the appearance design requirements of the foldable electronic device. Of course, those skilled in the art will appreciate that the width of the gap 470A can also be set to be greater than 2 mm according to actual needs.

[0309] Furthermore, in the length direction of the first parasitic radiator 420A, the distance between the first end 431A of the second parasitic radiator 430A and the second end 422A of the first parasitic radiator 420A is greater than or equal to 0 and less than or equal to 2 mm, so as to better meet the coupling requirements of the second parasitic radiator 430A and the first parasitic radiator 420A.

[0310] In the thickness direction of the foldable electronic device, the distance between the first parasitic radiator 420A and the isolation portion 440A is 2 mm to 4 mm, so that the coupling strength between the first parasitic radiator 420A and the second parasitic radiator 430A can be ensured.

[0311] At the same time, the resonant frequency of the main radiator 410A is related to the length of the main radiator 410A. The resonant frequency of the first parasitic radiator 420A is related to the length of the first parasitic radiator 420A. The resonant frequency of the second parasitic radiator 430A is related to the length of the second parasitic radiator 430A. As the length of the main radiator 410A changes, the resonant frequency of the main radiator 410A itself will change. As the length of the first parasitic radiator 420A changes, the resonant frequency of the first parasitic radiator 420A will change. As the length of the second parasitic radiator 430A changes, the resonant frequency of the second parasitic radiator 430A will change. Therefore, the lengths of the main radiator 410A, the first parasitic radiator 420A, and the second parasitic radiator 430A can be selected appropriately according to the antenna operating frequency band requirements.

[0312] See also Fig.11 The foldable electronic device further includes a main switch control circuit 500A, which includes a main switch device 510A and a plurality of different main matching branches 520A and 530A arranged in parallel. One end of the main switch device 510A forms one end 540A of the main switch control circuit, and the other end can be respectively connected to one end of the plurality of different main matching branches 520A and 530A, and the other ends of the plurality of different main matching branches 520A and 530A jointly form the other end 550A of the main switch control circuit.

[0313] In this embodiment, one end 540A of the main switch control circuit is connected to the floor of the first device body, and the other end 550A of the main switch control circuit is connected between the RF source 260A and the feeding point 413A of the main radiator 410A. It can be understood by those skilled in the art that in other alternative embodiments, one end 540A of the main switch control circuit is connected between the RF source 260A and the feeding point 413A of the main radiator 410A, and the other end 550A of the main switch control circuit is connected to the floor of the first device body.

[0314] The main switch device 510A is switched to one of a plurality of different main matching branches 520A and 530A to adjust the resonant frequency of the main radiator 410A, so that the antenna can cover different frequency bands.

[0315] Among them, the multiple different main matching branches 520A, 530A include two main matching branches 520A, 530A, and the two main matching branches 520A, 530A both include inductors, and the inductance values ​​of the two main matching branches 520A, 530A are different. That is, one of the main matching branches 520A includes an inductor L01, and the other main matching branch 530A includes an inductor L02, and the inductance values ​​of the inductor L01 and the inductor L02 are different. Those skilled in the art can understand that the inductance values ​​of the inductor L01 and the inductor L02 can be reasonably set according to actual needs.

[0316] Those skilled in the art will appreciate that, in other alternative implementations, the plurality of different main matching branches may include more than two main matching branches, and is not limited to two, and each main matching branch may include a 0 ohm resistor or inductor or capacitor.

[0317] Specifically, the main switch device 510A adopts a single-pole multi-throw switch. In this embodiment, the main switch device 510A adopts a single-pole double-throw switch. Those skilled in the art will appreciate that in other alternative embodiments, the main switch device 510A may also adopt a double-pole double-throw switch.

[0318] See also Fig.11, the first parasitic radiator 420A has a first connection point 423A, and the first connection point 423A is located near the first end 421A of the first parasitic radiator 420A. The foldable electronic device also includes a first switch control circuit 600A, and the first switch control circuit 600A includes a first switch device and a plurality of different first matching branches 620A and 630A arranged in parallel. One end of the first switch device forms one end 640A of the first switch control circuit, and the other end can be respectively selected to connect one end of the plurality of different first matching branches 620A and 630A, and the other ends of the plurality of different first matching branches 620A and 630A jointly form the other end 650A of the first switch control circuit.

[0319] In this embodiment, one end 640A of the first switch control circuit is connected to the floor of the first device body, and the other end 650A of the first switch control circuit is connected to the first connection point 423A of the first parasitic radiator 420A. It can be understood by those skilled in the art that, in other alternative embodiments, one end 640A of the first switch control circuit can also be connected to the first connection point 423A of the first parasitic radiator 420A, and the other end 650A of the first switch control circuit is connected to the floor of the first device body.

[0320] The first switch device is switched to one of the multiple different first matching branches 620A and 630A to adjust the resonant frequency of the first parasitic radiator 420A, so that the antenna can cover different frequency bands.

[0321] Specifically, the plurality of different first matching branches 620A, 630A include two first matching branches 620A, 630A, and the two first matching branches 620A, 630A both include inductors, and the inductors of the two first matching branches 620A, 630A have different inductance values. That is, one of the first matching branches 620A includes an inductor L11, and the other first matching branch 630A includes an inductor L12, and the inductance values ​​of the inductor L11 and the inductor L12 are different. Those skilled in the art can understand that the inductance values ​​of the inductor L11 and the inductor L12 can be reasonably set according to actual needs.

[0322] Those skilled in the art will appreciate that, in other alternative implementations, the plurality of different first matching branches may include more than two first matching branches, and is not limited to two, and each first matching branch may include a 0 ohm resistor or inductor or capacitor.

[0323] Specifically, the first switch device adopts a single-pole multi-throw switch. In this embodiment, the first switch device adopts a single-pole double-throw switch. Those skilled in the art can understand that in other alternative embodiments, the first switch device can also adopt a double-pole double-throw switch.

[0324] Furthermore, the distance between the first connection point 423A and the first end 421A of the first parasitic radiator 420A is 1.5 mm to 3 mm, which can better meet the coupling requirement between the main radiator 410A and the first parasitic radiator 420A.

[0325] See also Fig.11 , the second parasitic radiator 430A has a second connection point 433A, and the second connection point 433A is located near the second end 432A of the second parasitic radiator 430A. The foldable electronic device also includes a second switch control circuit 700A, and the second switch control circuit 700A includes a second switch device 710A and a plurality of different second matching branches 720A and 730A arranged in parallel. One end of the second switch device 710A forms one end 740A of the second switch control circuit, and the other end can be respectively selected to connect one end of the plurality of different second matching branches 720A and 730A, and the other ends of the plurality of different second matching branches 720A and 730A jointly form the other end 750A of the second switch control circuit.

[0326] In this embodiment, one end 740A of the second switch control circuit is connected to the floor of the second device body, and the other end is connected to the second connection point 433A of the second parasitic radiator 430A. It can be understood by those skilled in the art that, in other alternative embodiments, one end 740A of the second switch control circuit can also be connected to the second connection point 433A of the second parasitic radiator 430A, and the other end is connected to the floor of the second device body.

[0327] The second switch device 710A is switched to one of the multiple different second matching branches 720A and 730A to adjust the resonant frequency of the second parasitic radiator 430A. When the second switch device 710A is selected to another second matching branch 730A, the second parasitic radiator 430A plays a parasitic radiation role on the main radiator 410A, which can reduce the body SAR value, improve the efficiency of the antenna, and increase the transmission power of the antenna, thereby improving the antenna performance of the foldable electronic device in a free space scenario or a handheld scenario when the foldable electronic device is in a folded state.

[0328] When the second switch device 710A is selected to one of the second matching branches 720A, the parasitic radiation effect of the second parasitic radiator 430A on the main radiator 410A is very weak, or even has no parasitic radiation effect on the main radiator 410A. At this time, the second parasitic radiator 430A can block and isolate the radiation of the main radiator 410A of the antenna 400A and the first parasitic radiator 420A toward the second parasitic radiator 430A, so that when the antenna 400A is located on the top of the foldable electronic device, the head SAR value of the antenna is reduced in the head-hand-held scenario, and the degree of attenuation of the radiation performance of the foldable electronic device is reduced, that is, the head-hand-held degradation is reduced, thereby improving the radiation performance of the foldable electronic device in the head-hand-held scenario.

[0329] Specifically, the plurality of different second matching branches include two second matching branches, and the two second matching branches include a 0 ohm resistor (i.e., a resistor of 0 ohm) and an inductor, respectively. That is, one of the second matching branches 720A includes a 0 ohm resistor, and the other second matching branch 730A includes an inductor L2. Those skilled in the art can understand that the inductance value of the inductor L2 can be reasonably set according to actual needs.

[0330] When the second switch device 710A switches on the second matching branch including the 0-ohm resistor, the second parasitic radiator 430A does not perform parasitic radiation on the main radiator 410A. When the second switch device 710A switches on the second matching branch including the inductor L2, the second parasitic radiator 430A performs parasitic radiation on the main radiator 410A.

[0331] Those skilled in the art can understand that, in other alternative implementations, the plurality of different second matching branches can also include more than two second matching branches, not limited to two, and each second matching branch can include a 0 ohm resistor or an inductor or a capacitor. In other words, one of the second matching branches 720A of the two second matching branches can include a capacitor, and the other second matching circuit can include an inductor, which does not limit the protection scope of the present application.

[0332] like Fig.11 As shown, the second switch device 710A adopts a single-pole multi-throw switch. In this embodiment, the second switch device 710A adopts a single-pole double-throw switch. Those skilled in the art will appreciate that in other alternative embodiments, the second switch device 710A may also adopt a double-pole double-throw switch.

[0333] Furthermore, the distance between the second connection point 433A and the second end 432A of the second parasitic radiator 430A is 1.5 mm to 3 mm, which can better meet the coupling requirement between the first parasitic radiator 420A and the second parasitic radiator 430A.

[0334] In this embodiment, the triggering method of the second switch device 710A can also adopt the triggering method of the first switch device in Example 1. For example, in the default state, the second switch device 710A is selected to another second matching branch 730A including the inductor L2. The trigger signal of the second switch device 710A switches from another second matching branch 730A including the inductor L2 to one of the second matching branches 720A including the 0 ohm resistor. It can be triggered by transmitting a signal of the earpiece being turned on (or the earpiece making a sound) to the processing device, or it can be triggered by transmitting a signal detected by a proximity light sensor, ambient light sensor, or distance sensor to the processing device, which will not be elaborated herein.

[0335] In this embodiment, the main radiator 410A, the first parasitic radiator 420A, the second parasitic radiator 430A and the isolation portion 440A can be formed by a metal frame of a foldable electronic device, or a metal sheet (such as a steel sheet), or a flexible printed circuit (Flexible Printed Circuit FPC), or can be formed in the form of LDS (Laser Direct Structuring).

[0336] In this embodiment, the isolation portion 440A is connected to the second parasitic radiator 430A without any gap in between. When the second parasitic radiator 430A plays a parasitic radiation role on the main radiator 410A, part of the metal in the isolation portion 440A also participates in the radiation, but the amount of radiation can be ignored, and most of the metal plays a role of blocking and isolation. Since there is no gap between the isolation portion 440A and the second parasitic radiator 430A, while ensuring the blocking and isolation effects, the structural stability is improved and the overall body is more beautiful.

[0337] The following combination Figure 12 to Figure 16 The antenna performance in foldable electronic devices is specifically described.

[0338] In order to verify the performance of the antenna in the embodiment of the present application, the full-wave electromagnetic simulation software HFSS was used for simulation analysis, and the obtained Figure 12 to Figure 16 Simulation effect diagram.

[0339] Get Figure 12 to Figure 16 The simulation conditions of the simulation effect diagram shown are shown in Table 4 below (please refer to Fig.11 Understand):

[0340] Table 4

[0341]

[0342]

[0343] Combination Fig.11 It is understood that the following simulation test is performed by switching the main switch device 510A, the first switch device and the second switch device 710A, taking the antenna in two states as an example, and obtaining Figure 12 to Figure 16 The simulation effect diagram is shown.

[0344] State 1: the main switch device 510A switches to another main matching branch 530A of the inductor L02 with an inductance value of 4nH, the first switch device switches to another first matching branch 630A of the inductor L12 with an inductance value of 2nH, and the second switch device 710A switches to another second matching branch 730A of the inductor L2 with an inductance value of 15nH. In state 1, both the first parasitic radiator 420A and the second parasitic radiator 430A play a parasitic radiation role on the main radiator 410A.

[0345] State 2: the main switch device 510A switches to one of the main matching branches 520A of the inductor L01 with an inductance value of 15 nH, the first switch device switches to one of the first matching branches 620A of the inductor L11 with an inductance value of 8 nH, and the second switch device 710A switches to one of the second matching branches 720A with an inductance value of 0 ohm. In state 2, the first parasitic radiator 420A plays a parasitic radiation role on the main radiator 410A, but the second parasitic radiator 430A does not play a parasitic radiation role on the main radiator 410A.

[0346] See also Figure 12-13 , Fig.12 The figure is a curve diagram showing the comparison of the S parameters of the antenna in state 1 and state 2 obtained during the simulation effect test of the foldable electronic device. Fig.13 The effect curve diagram is a comparison of the radiation efficiency and system efficiency (i.e., efficiency) of the antenna in state 1 and state 2 obtained during the simulation effect test of the foldable electronic device. In state 1, the second parasitic radiator plays a parasitic radiation role on the main radiator, and in state 2, the second parasitic radiator does not play a parasitic radiation role on the main radiator.

[0347] Among them, Fig.12 In the figure, the horizontal axis represents the frequency in GHz, and the vertical axis represents S 11 The amplitude value of S is in dB. 11 It is a kind of S parameter. 11Represents the reflection coefficient. This parameter indicates the transmission efficiency of the antenna. The smaller the value, the less energy is reflected back by the antenna itself, and the better the efficiency of the antenna. Fig.12 The two curves "State 1" and "State 2" represent S in state 1 and state 2 respectively. 11 The curve diagram of the change with frequency. In state 1 and state 2, in the frequency range of 1.72GHz to 1.84GHz, S 11 Less than -6dB, that is, the antenna has good impedance matching in state 1 and state 2.

[0348] See also Fig.13 , Fig.13 The radiation efficiency and system efficiency effect curves of the antenna obtained by simulating and testing the free space scenario in state 1 and state 2.

[0349] from Fig.13 It can be seen that when simulating the free space scenario in state 1, when the antenna's operating frequency is 1.72 GHz, the antenna's system efficiency (i.e., efficiency) is -3.3565 dB. When the antenna's operating frequency is 1.78 GHz, the antenna's system efficiency (i.e., efficiency) is -2.3834 dB.

[0350] When simulating the free space scenario in state 2, when the antenna's operating frequency is 1.72 GHz, the antenna's system efficiency (i.e., efficiency) is -3.9685 dB. When the antenna's operating frequency is 1.78 GHz, the antenna's system efficiency (i.e., efficiency) is -2.7585 dB.

[0351] From the above, we can see that, compared with state 2, that is, after adding the parasitic radiation effect of the second parasitic radiator on the main radiator, when the antenna operating frequency is 1.72GHz, the system efficiency (ie, efficiency) of the antenna is improved by 0.612dB, and when the antenna operating frequency is 1.78GHz, the system efficiency (ie, efficiency) of the antenna is improved by 0.3751dB. In other words, after the second parasitic radiator plays a parasitic radiation role on the main radiator, the system efficiency of the antenna can be improved.

[0352] See also Figure 14a to Figure 15b , Figure 14a to Figure 14b The local magnetic field distribution diagram of the antenna in state 1 and state 2 obtained during the simulation effect test of the foldable electronic device. Figure 15a to Figure 15b The antenna hotspot distribution diagram of the foldable electronic device in state 1 and state 2 obtained during the simulation effect test. The operating frequency range of the antenna is 1.7 GHz to 1.9 GHz, and the operating frequency of the antenna is 1.8 GHz. Figure 14a to Figure 15bThe X direction is parallel to the lateral direction of the foldable electronic device, and the Z direction is parallel to the thickness direction of the foldable electronic device. In state 1, the second parasitic radiator plays a parasitic radiation role on the main radiator, and in state 2, the second parasitic radiator does not play a parasitic radiation role on the main radiator.

[0353] like Fig.14a and Fig.14b As shown, in state 1, the magnetic field radiation area of ​​the antenna (see the area shown in the dotted box in the figure) is more dispersed than in state 2. That is to say, adding the second parasitic radiator can disperse the magnetic field radiation area of ​​the antenna, which is equivalent to increasing the width of the main radiator of the antenna and increasing the radiation area of ​​the antenna, thereby improving the antenna efficiency and reducing the body SAR value.

[0354] like Figure 15a to Figure 15b As shown, the hot spots of the antenna are more dispersed in state 1 than in state 2. That is, after the second parasitic radiator plays a parasitic radiation role on the main radiator, the hot spots of the antenna can be more dispersed, thereby reducing the body SAR value.

[0355] Please refer to Table 5 below, which shows the antenna performance related parameters in the free space scenario, the head left hand holding scenario and the head right hand holding scenario obtained in State 1 and State 2. In the figure, "off parasitic" means in State 2, that is, the second parasitic radiator does not play a parasitic radiation role on the main radiator. "on parasitic" means in State 1, that is, the second parasitic radiator plays a parasitic radiation role on the main radiator. 1g means that the biological tissue fluid has a unit volume size of 1g (equivalent to 1cm 3 ) standard. 10g means that the biological tissue fluid is measured in 10g unit volume (equivalent to 10cm 3 ) standards for testing.

[0356] “head SAR” indicates the head SAR value. “Normalized head SAR” indicates the head SAR value measured when the efficiency of the antenna is normalized to -5dB. “Normalized 5mm body SAR” indicates the body SAR value measured when the efficiency of the antenna is normalized to -5dB. “right head touch” indicates the scenario in which the right side of the head touches the foldable electronic device. “left head touch” indicates the scenario in which the left side of the head touches the foldable electronic device. “5mm backside” indicates the scenario in which the back of the foldable electronic device is 5mm away from the body. “0mm backside” indicates the scenario in which the back of the foldable electronic device touches the body. “5mmtopside” indicates the scenario in which the top of the foldable electronic device is 5mm away from the body. “0mm topside” indicates the scenario in which the top of the foldable electronic device touches the body.

[0357] As can be seen from Table 5 below, in state 2, in a free space scenario, when the top of the foldable electronic device is 5 mm away from the body, the body SAR value is 1.64 W / kg when the antenna's operating frequency is 1.72 GHz; the body SAR value is 1.44 W / kg when the antenna's operating frequency is 1.78 GHz. In state 1, in a free space scenario, when the top of the foldable electronic device is 5 mm away from the body, the body SAR value is 1.32 W / kg when the antenna's operating frequency is 1.72 GHz; the body SAR value is 1.2 W / kg when the antenna's operating frequency is 1.78 GHz.

[0358] It can be seen that in state 1, compared with state 2, that is, adding a second parasitic radiator to play a parasitic radiation role on the main radiator, when the antenna operating frequency is 1.72GHz, the body SAR value can be reduced from 1.64W / kg to 1.32W / kg, and when the antenna operating frequency is 1.78GHz, the body SAR value can be reduced from 1.44W / kg to 1.2W / kg. In other words, when the antenna is in state 1, the body SAR value is lower.

[0359] In addition, in state 2, when the head is held in the right hand, the head SAR value is 0.46W / kg when the antenna's operating frequency is 1.72GHz and 1.78GHz. In state 1, when the head is held in the right hand, the head SAR value is 0.55W / kg when the antenna's operating frequency is 1.72GHz; and the head SAR value is 0.62W / kg when the antenna's operating frequency is 1.78GHz.

[0360] It can be seen that in state 1, compared with state 2, that is, adding a second parasitic radiator to play a parasitic radiation role on the main radiator, when the antenna operating frequency is 1.72GHz, the head SAR value will increase from 0.46W / kg to 0.55W / kg, and when the antenna operating frequency is 1.78GHz, the body SAR value can be increased from 0.46W / kg to 0.62W / kg, that is, the head SAR value is deteriorated. In other words, when the antenna is in state 2, the head SAR value is lower.

[0361] Table 5

[0362]

[0363] See also Fig.16 , Fig.16 The following is a curve diagram showing the comparison of the radiation efficiency and system efficiency (i.e., efficiency) of the antenna in the free space scenario, the head left hand holding scenario, and the head right hand holding scenario obtained when the foldable electronic device is subjected to simulation effect testing in state 2. In state 2, the second parasitic radiator does not play a parasitic radiation role on the main radiator.

[0364] Fig.16 The curves "FS 1" and "FS 2" in the figure respectively represent the curves of the system efficiency and radiation efficiency of the antenna in state 2 when simulating the free space scenario. The curves "BHHL 1" and "BHHL 2" respectively represent the curves of the system efficiency and radiation efficiency of the antenna in state 2 when simulating the left hand holding scenario. The curves "BHHR 1" and "BHHR 2" respectively represent the curves of the system efficiency and radiation efficiency of the antenna in state 2 when simulating the right hand holding scenario.

[0365] FS stands for Free Space, which means that the FS scene is a Free Space scene. The scene where the head is held with the left hand is the BHHL (Beside Head Hand Left) scene. The scene where the head is held with the right hand is the BHHR (Beside Head Hand Right) scene.

[0366] from Fig.16It can be seen that in state 2, when simulating the free space scenario, the maximum value of the antenna's system efficiency (i.e., efficiency) is -2.8dB, and the antenna's operating frequency is 1.78GHz. In state 2, when simulating the test head holding the left hand scenario, the maximum value of the antenna's system efficiency (i.e., efficiency) is -7.5dB, and the antenna's operating frequency is 1.78GHz. In state 2, when simulating the test head holding the right hand scenario, the maximum value of the antenna's system efficiency (i.e., efficiency) is -6.7dB, and the antenna's operating frequency is 1.78GHz. That is, in state 2, the maximum value of the antenna's system efficiency (i.e., efficiency) is reduced by 4.7dB compared to the free space scenario in the simulation test head holding the left hand scenario, that is, the head holding the hand reduces by 4.7dB; the maximum value of the antenna's system efficiency (i.e., efficiency) is reduced by 3.9dB compared to the free space scenario in the simulation test head holding the right hand scenario, that is, the head holding the hand reduces by 3.9dB.

[0367] It can be seen that when the antenna is in state 2, the head hand-holding drop is relatively low, that is, the radiation performance attenuation of the foldable electronic device is reduced. As shown in Table 5 above, at this time, the head SAR value is 0.46W / kg. Therefore, when the antenna is in state 2, that is, when the second parasitic radiator does not play a parasitic radiation role on the main radiator, it can ensure that the head SAR value requirements of the antenna located at the top of the foldable electronic device are met, and the head hand-holding drop is reduced, thereby improving the radiation performance of the foldable electronic device.

[0368] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A foldable electronic device, comprising a first device body, a second device body, a receiver and an antenna, wherein the first device body and the second device body are connected via a rotating shaft, characterized in that: The antenna comprises a main radiator and a first parasitic radiator, the main radiator is arranged on the first device body and connected to the radio frequency source of the foldable electronic device, the first parasitic radiator and the earpiece are arranged on the second device body, and when the foldable electronic device is in a folded state, the main radiator and the first parasitic radiator are arranged opposite to each other at a first interval, and are coupled to the first parasitic radiator through the first interval; The foldable electronic device further includes a first switch control circuit, the first parasitic radiator is electrically connected to the ground of the second device body through the first switch control circuit, and the first switch control circuit includes a first switch device and a plurality of different first matching branches arranged in parallel; The first switching device switches between the plurality of different first matching branches to adjust the resonant frequency of the first parasitic radiator; The resonant frequency of the main radiator is within a first frequency band, and when the foldable electronic device is in the folded state and the earpiece is in the closed state, the resonant frequency of the first parasitic radiator is close to the resonant frequency of the main radiator; When the earpiece is in an open state, the resonant frequency of the first parasitic radiator is opposite to and away from the resonant frequency of the main radiator.

2. The foldable electronic device according to claim 1, characterized in that: The plurality of different first matching branches include a first sub-matching branch and a second sub-matching branch, and each of the first sub-matching branch and the second sub-matching branch includes a 0-ohm resistor or inductor or capacitor.

3. The foldable electronic device according to claim 1 or 2, characterized in that: The resonant frequency of the first parasitic radiator is close to the resonant frequency of the main radiator, comprising: the resonant frequency of the first parasitic radiator is within the first frequency band; and The resonant frequency of the first parasitic radiator is opposite to and far from the resonant frequency of the main radiator, including: the resonant frequency of the first parasitic radiator is within a second frequency band, wherein the first frequency band and the second frequency band are different frequency bands.

4. The foldable electronic device according to claim 3, characterized in that: When the plurality of different first matching branches include a first sub-matching branch and a second sub-matching branch, the first sub-matching branch includes a 0-ohm resistor, and the second sub-matching branch includes an inductor; When the first switch device switches on the first sub-matching branch, the resonant frequency of the first parasitic radiator is within the second frequency band; When the first switch device switches on the second sub-matching branch, the resonant frequency of the first parasitic radiator is within the first frequency band.

5. The foldable electronic device according to claim 1, wherein: The main radiator has a first end and a second end, and the first parasitic radiator has a first end and a second end, and when the foldable electronic device is in the folded state, the first end of the main radiator and the first end of the first parasitic radiator are arranged correspondingly, and the second end of the main radiator and the second end of the first parasitic radiator are arranged correspondingly; The second end of the main radiator is connected to the ground of the first device body, the main radiator has a feeding point, the feeding point is located near the first end of the main radiator, and the feeding point is connected to the radio frequency source; The second end of the first parasitic radiator is connected to the ground of the second device body, the first parasitic radiator has a first connection point, the first connection point is located near the first end of the first parasitic radiator, and the first connection point is connected to the first switch control circuit.

6. The foldable electronic device according to claim 5, characterized in that: The foldable electronic device also includes a main switch control circuit, the feeding point of the main radiator is electrically connected to the ground of the first device body through the main switch control circuit, the main switch control circuit includes a main switch device and a plurality of different main matching branches arranged in parallel, and the main switch device is used to switch between the plurality of different main matching branches to adjust the resonant frequency of the main radiator.

7. The foldable electronic device according to claim 6, characterized in that: The multiple different main matching branches include two main matching branches, the two main matching branches both include inductors, and the inductors in the two main matching branches have different inductance values.

8. The foldable electronic device according to claim 1, wherein: The main radiator and the first parasitic radiator are both in the shape of straight strips; and / or, when the foldable electronic device is in the folded state, the main radiator and the first parasitic radiator are arranged parallel to each other; And / or, when the foldable electronic device is in the folded state, the first end of the main radiator is aligned with the first end of the first parasitic radiator, and the second end of the main radiator is aligned with the second end of the first parasitic radiator.

9. The foldable electronic device according to claim 1, wherein: The antenna also includes a second parasitic radiator, which is arranged on the first device body, and is longitudinally spaced opposite to the main radiator end to end. The second parasitic radiator has a first end and a second end, and the first end of the second parasitic radiator is relatively close to the first end of the main radiator and has a first gap. The second parasitic radiator is coupled to the main radiator through the first gap, and the second end of the second parasitic radiator is relatively far away from the second end of the main radiator and is connected to the ground of the first device body.

10. The foldable electronic device according to claim 9, characterized in that: The second parasitic radiator has a second connection point, and the second connection point is located near the first end of the second parasitic radiator; The foldable electronic device also includes a second switch control circuit, the second connection point of the second parasitic radiator is electrically connected to the ground of the first device body through the second switch control circuit, the second switch control circuit includes a second switch device and a plurality of different second matching branches arranged in parallel, and the second switch device switches between the plurality of different second matching branches to adjust the resonant frequency of the second parasitic radiator.

11. The foldable electronic device according to claim 10, characterized in that: The multiple different second matching branches include two second matching branches, the two second matching branches both include inductors, and the inductors on the two second matching branches have different inductance values.

12. The foldable electronic device according to claim 9, wherein: The second parasitic radiator is in a straight strip shape; And / or, the main radiator and the second parasitic radiator are arranged in a straight line.

13. The foldable electronic device according to claim 9, characterized in that: The antenna further includes a third parasitic radiator, which is disposed on the second device body, and the third parasitic radiator is longitudinally spaced opposite to the first parasitic radiator end to end, and has a first end and a second end, the first end of the third parasitic radiator is relatively close to the first end of the first parasitic radiator and has a second gap, the second end of the third parasitic radiator is relatively far away from the second end of the first parasitic radiator, and is connected to the ground of the second device body; the third parasitic radiator has a third connection point, and the third connection point is located at a position close to the first end of the third parasitic radiator; when the foldable electronic device is in the folded state, the third parasitic radiator is arranged opposite to the second parasitic radiator at a second interval, and is coupled to the second parasitic radiator through the second interval, and the third parasitic radiator is coupled to the first parasitic radiator through the second gap, and the third parasitic radiator is also coupled to the main radiator; The foldable electronic device further includes a third switch control circuit, the third connection point of the third parasitic radiator is electrically connected to the ground of the second device body through the third switch control circuit, the third switch control circuit includes a third switch device and a plurality of different third matching branches arranged in parallel, and the third switch device switches between the plurality of different third matching branches to adjust the resonant frequency of the third parasitic radiator; When the foldable electronic device is in the folded state and the earpiece is in the closed state, the resonant frequency of the third parasitic radiator is close to the resonant frequency of the main radiator; When the earpiece is in an open state, the resonant frequency of the third parasitic radiator is opposite to the resonant frequency of the main radiator.

14. The foldable electronic device according to claim 13, characterized in that: The plurality of different third matching branches include a third sub-matching branch and a fourth sub-matching branch, the third sub-matching branch includes a 0-ohm resistor, and the fourth sub-matching branch includes an inductor; When the third switch device switches on the third sub-matching branch, the resonant frequency of the third parasitic radiator is within the second frequency band; When the third switch device switches on the fourth sub-matching branch, the resonant frequency of the third parasitic radiator is within the first frequency band.

15. The foldable electronic device according to claim 13, characterized in that: The third parasitic radiator is in a straight strip shape; And / or, the third parasitic radiator and the first parasitic radiator are arranged in a straight line, and when the foldable electronic device is in the folded state, the third parasitic radiator and the second parasitic radiator are arranged parallel to each other; And / or, when the foldable electronic device is in the folded state, the first end of the third parasitic radiator is aligned with the first end of the second parasitic radiator, and the second end of the third parasitic radiator is aligned with the second end of the second parasitic radiator.

16. The foldable electronic device according to any one of claims 1 to 15, characterized in that: When the foldable electronic device is in the folded state, the antenna is located at the top or bottom of the foldable electronic device or at a side away from the rotation axis.

17. The foldable electronic device according to any one of claims 1 to 15, characterized in that: The antenna is formed by a metal frame at the top of the foldable electronic device, and the earpiece is located at the top of the foldable electronic device.

18. The foldable electronic device according to any one of claims 1 to 15, characterized in that: The foldable electronic device further comprises a processing device, wherein the foldable electronic device is in the folded state, When the handset is turned on and a first trigger signal is generated, the processing device controls the first switch device to select a first sub-matching branch among the plurality of different first matching branches in response to the first trigger signal, so that the resonant frequency of the first parasitic radiator is within the second frequency band; as well as When the earpiece is turned off and a second trigger signal is generated, the processing device controls the first switch device to select the second sub-matching branch of the multiple different first matching branches in response to the second trigger signal, so that the resonant frequency of the first parasitic radiator is within the first frequency band.

19. The foldable electronic device according to any one of claims 1 to 15, characterized in that: The foldable electronic device further comprises a trigger device and a processing device. The foldable electronic device is in the folded state. When the trigger device generates a first trigger signal, the processing device controls the first switch device to select a first sub-matching branch in the plurality of different first matching branches in response to the first trigger signal, so that the resonant frequency of the first parasitic radiator is within the second frequency band; When the trigger device generates a second trigger signal, the processing device controls the first switch device to select the second sub-matching branch in the multiple different first matching branches in response to the second trigger signal, so that the resonant frequency of the first parasitic radiator is within the first frequency band.

20. The foldable electronic device according to claim 19, characterized in that: The trigger device is a proximity light sensor, an ambient light sensor, or a distance sensor, wherein when the trigger device is blocked by the user's body, the trigger device generates the first trigger signal, and when the trigger device is away from the user's body, the trigger device generates the second trigger signal.

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