Antenna structure and electronic device

Abstract

The application discloses an antenna structure and an electronic device, wherein the antenna structure comprises a frame body, a first antenna and a second antenna arranged on the frame body, wherein the second antenna is arranged around the first antenna, and the first antenna and the second antenna are arranged at intervals. In the technical scheme of the application, the first antenna and the second antenna arranged at intervals can generate a radiation electric field with a phase difference under the joint action of the two, so that the near electric field produces a certain mutual cancellation effect, and thus the radiation of the entire electronic device to the human body is reduced under the joint action of the two antennas.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of electronic equipment, and particularly relates to an antenna structure and an electronic equipment. BACKGROUND

[0002] At present, for electronic products, the user will usually be affected by the emission and reception of electromagnetic waves in the use process, and the operators have certain control over the influence on the human body for the consideration of human health, and have formulated standards. In order to meet the standards, each manufacturer usually adopts the scheme of increasing the corresponding sensor, and when the human body is detected to approach the device, the transmission power of the device is reduced to achieve the effect of reducing the radiation to the human body. However, when the transmission power is reduced, although the human body radiation can be reduced, the far field communication capability will also be reduced, which affects the communication effect. SUMMARY

[0003] The present application aims to at least solve one of the problems in the prior art or related art.

[0004] The present application aims to provide an antenna structure and an electronic equipment, by simultaneously arranging the first antenna and the second antenna with a certain interval, the radiated electric field with a phase difference can be generated under the joint action of the two, so that the near electric field will have a certain mutual cancellation effect, and then the near field radiation of the entire electronic equipment to the human body will be reduced under the joint action of the two antennas.

[0005] In order to achieve the above-mentioned purpose, the antenna structure provided by the first aspect of the embodiments of the present application comprises: a frame body; a first antenna and a second antenna arranged on the frame body; wherein the second antenna is arranged outside the first antenna, and the first antenna and the second antenna are arranged with a certain interval.

[0006] According to the embodiments of the antenna structure provided by the present application, it comprises: a frame body, a first antenna and a second antenna. The first antenna and the second antenna are mainly used for radiating electromagnetic waves outward or receiving electromagnetic waves. Generally, only a single-sided frame antenna is arranged on the frame body, and an additional antenna structure is arranged in the present application, that is, the first antenna and the second antenna arranged outside the first antenna are simultaneously arranged. Since there is a certain interval between the first antenna and the second antenna, that is, the first antenna and the second antenna are arranged with a certain interval, when the electromagnetic waves are radiated outward, since there is a certain interval between the two antennas, when the two antennas radiate outward together, a phase difference will be formed in a certain plane, so that the near electric field will be reduced to a certain extent, thereby achieving the effect of field strength cancellation. Because the field strength is cancelled, the radiation to the human body is reduced, thereby improving the compatibility of the antenna radiation influence on the human body and the communication capability.

[0007] It should be noted that the first antenna and the second antenna can be arranged at the edge of the frame body or at a specific position for outward radiation.

[0008] The current inside the first antenna and the second antenna is required to be same frequency and same direction when radiating electromagnetic waves outward, on the one hand, another antenna can be directly added on the originally arranged single antenna, and the installation is improved to be simple, on the other hand, since the current is same frequency and same direction, the loss of the far field performance of the antenna can be reduced.

[0009] In a second aspect, an embodiment of an electronic device is provided, comprising: a device body; and the antenna structure in any of the above embodiments, arranged on the device body.

[0010] The electronic device provided by the second aspect of the present application comprises a device body and an antenna structure, wherein the antenna structure is arranged on the device body to facilitate the basic communication function of the electronic device. Since the electronic device comprises the antenna structure in the first aspect of the present application, it has the beneficial effects of any of the above embodiments, which will not be repeated here.

[0011] The electronic device can be a smart phone, a tablet, a smart watch, a smart bracelet, or other devices that can emit electromagnetic waves for communication.

[0012] Additional aspects and advantages of the present application will become apparent in the following description section, or can be understood by practicing the present application. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 A structural schematic diagram of an antenna structure according to an embodiment of the present application is shown;

[0014] Figure 2 A structural schematic diagram of an antenna structure according to an embodiment of the present application is shown;

[0015] Figure 3 A structural schematic diagram of an antenna structure according to an embodiment of the present application is shown;

[0016] Figure 4 A structural schematic diagram of an antenna structure according to an embodiment of the present application is shown;

[0017] Figure 5 A structural schematic diagram of an antenna structure according to an embodiment of the present application is shown;

[0018] Figure 6 A structural schematic diagram of an electronic device according to an embodiment of the present application is shown.

[0019] wherein, Figures 1 to 6Correspondence between reference signs and component names is as follows:

[0020] 100: antenna structure; 102: frame; 1042: first antenna; 1044: second antenna; 106: connecting plate; 108: feeding structure; 110: ground return structure; 112: antenna medium; 114: split structure; 200: electronic device; 202: device body. DETAILED DESCRIPTION

[0021] Embodiments of the present application will be described in detail below, examples of which are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts fall within the scope of protection of the present application.

[0022] The terms "first", "second" in the description and claims of the present application can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / ", generally means that the front and rear associated objects are in an "or" relationship.

[0023] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0024] The electronic device provided in the embodiments of the present application is mainly used for electronic devices, such as mobile terminals such as mobile phones, wearable devices, tablet computers, laptop computers, mobile computers, palm game consoles, video recorders and camcorders, etc. Of course, it can also be not limited to electronic devices, but can be applied to other devices that need to radiate electromagnetic waves outward.

[0025] The following will be described with reference to Figures 1 to 6 The antenna structure and electronic device provided according to the embodiments of the present application are described.

[0026] As Figure 1 and Figure 2As shown, one embodiment of the present application provides an antenna structure 100, comprising: a frame 102; a first antenna 1042 and a second antenna 1044 arranged on the frame 102; wherein the second antenna 1044 is arranged around the first antenna 1042, and the first antenna 1042 and the second antenna 1044 are arranged in a spaced manner.

[0027] According to the embodiment of the antenna structure 100 provided by the present application, it comprises: a frame 102, a first antenna 1042 and a second antenna 1044. Wherein the first antenna 1042 and the second antenna 1044 are mainly used for radiating electromagnetic waves outward or receiving electromagnetic waves. Generally, only a single-sided frame antenna is arranged on the frame 102, while the present application additionally arranges an antenna structure 100, i.e. simultaneously arranges the first antenna 1042 and the second antenna 1044 arranged around the first antenna 1042. Since there is a certain interval between the first antenna 1042 and the second antenna 1044, i.e. the first antenna 1042 and the second antenna 1044 are arranged in a spaced manner, when radiating electromagnetic waves outward, since there is a certain interval between the two antennas, when the two antennas radiate outward together, a phase difference will be formed in a certain plane, thereby reducing the near electric field to a certain extent, thereby achieving the effect of field strength cancellation. Because the field strength is cancelled, the radiation to the human body is reduced, thereby improving the compatibility of the antenna's near-field radiation influence on the human body and the far-field communication ability.

[0028] It should be noted that the positions of the first antenna 1042 and the second antenna 1044 arranged on the frame 102 can be the edge or a specific position for outward radiation.

[0029] Of course, the relationship between the first antenna 1042 and the second antenna 1044 and the frame 102 can be independent of each other, and the two are fixed in position through a certain connection relationship, or the first antenna 1042 and the second antenna 1044 can be directly machined on the frame 102, at this time the first antenna 1042, the second antenna 1044 and the frame 102 are an integral structure.

[0030] Wherein, when the first antenna 1042 and the second antenna 1044 radiate electromagnetic waves outward, the current inside them needs to be the same frequency and the same direction. On the one hand, another antenna can be directly added to the originally arranged single antenna, which is simple to improve and install. On the other hand, since the same frequency and the same direction current is used, it can also ensure to reduce the loss of the far-field performance of the antenna.

[0031] The specific working principle is as follows: the first antenna 1042 and the second antenna 1044 radiate electromagnetic waves as a radiation body, and the radiation electric fields of the two can form a phase difference in a certain plane. The phase difference varies with the working frequency and the position, but as long as the phase difference exists, the near electric field in a certain plane will have a certain cancellation effect. As shown in Figure 4 , the currents on both sides of the slot are equal-amplitude and same-direction currents I and I', which generate near electric fields E and E' at a certain point a on the SAR measurement plane. Since the near electric fields generated by the two current sources have a path difference when radiated to point a, the two electric fields will have a phase difference at point a, thereby having a field strength cancellation effect at this point. Of course, there are also points on this plane where the two near electric fields have no path difference, but since SAR is the average value of a certain hot spot area, it will not measure the position without phase difference, resulting in no SAR reduction effect.

[0032] Those skilled in the art should understand that the antenna is a conductor, and the antenna's radiation parameter to the human body can be the specific absorption ratio (SAR).

[0033] Further, at least part of the first antenna 1042 and at least part of the second antenna 1044 are arranged in parallel.

[0034] By limiting the parallel arrangement of part of the first antenna 1042 and part of the second antenna 1044, the electric field parameters generated by the currents inside the two can be closer, specifically, the electric field parameters of the electric fields generated by the currents inside the parallel arranged parts are closer, so as to form a phase difference and have a mutual cancellation effect, thereby reducing the radiation to the human body, and further improving the compatibility of the antenna's radiation influence on the human body and communication ability.

[0035] Of course, it should be noted that the parallel part of the first antenna 1042 and the second antenna 1044 can be a local relative structure, and can also be a complete structure.

[0036] Further, as shown in Figure 3 , it comprises a connecting plate 106 arranged on one side of the first antenna 1042 and the second antenna 1044, and both ends of the connecting plate 106 are connected with the first antenna 1042 and the second antenna 1044 respectively; wherein the first antenna 1042, the second antenna 1044 and the connecting plate 106 form a slot-shaped structure.

[0037] The connecting plate 106 is arranged on one side of the first antenna 1042 and the second antenna 1044, and the two ends of the connecting plate 106 are connected to the first antenna 1042 and the second antenna 1044, so that the two antennas are connected to form a groove-shaped structure under the action of the connecting plate 106, in other words, the first antenna 1042 and the second antenna 1044 are connected through the connecting plate 106, in this case, the groove-shaped structure is easier to process, and the currents in the first antenna 1042 and the second antenna 1044 are connected through the connecting plate 106, which can ensure that the amplitudes are the same and the directions are the same.

[0038] It can be understood that the extension direction of the connecting plate 106 is the same as the extension direction of the first antenna 1042 and the second antenna 1044, so that the shape of the connecting plate 106 is the same as the shape of the first antenna 1042 and the second antenna 1044, for example, the first antenna 1042 and the second antenna 1044 are annular, and the connecting plate 106 is also annular.

[0039] Further, it comprises a feeding structure 108 arranged on the first antenna 1042.

[0040] The feeding structure 108 is arranged on the first antenna 1042 to facilitate the delivery of current in the first antenna 1042. It can be understood that the other end of the feeding structure 108 is provided with a power supply device to facilitate normal electromagnetic wave radiation outward. It should be noted that the feeding structure 108 is electrically connected with the external power supply device, which can be wired connection or wireless connection. When the wireless connection is used, the coupling mode can be used.

[0041] In other words, the feeding structure 108 can be realized by using a spring straight feeding mode, or can be realized by using a coupling mode.

[0042] Further, it further comprises a grounding return structure 110 arranged on the first antenna 1042, and one end of the grounding return structure 110 is grounded.

[0043] The grounding return structure 110 is further arranged on the first antenna 1042, and one end of the grounding return structure 110 is grounded to ensure normal use of the first antenna 1042. Those skilled in the art should understand that after the antenna is grounded, the interference can be reduced, and the anti-interference ability and lightning protection ability can be effectively improved.

[0044] Further, as shown in Figure 5 It further comprises an antenna medium 112 arranged between the first antenna 1042 and the second antenna 1044.

[0045] By placing the antenna medium 112 between the first antenna 1042 and the second antenna 1044, the wavelength of the electromagnetic wave radiated outward by the first antenna 1042 and the second antenna 1044 can be changed under the action of the antenna medium 112. Since the antenna medium 112 can be selected to have different dielectric constants according to requirements, the phase difference of the near electric field can be changed, thereby reducing the radiation of different frequency bands.

[0046] It can be understood that the dielectric constant of the antenna medium 112 is different from the dielectric constant of air. When the antenna medium 112 is not arranged between the first antenna 1042 and the second antenna 1044, air exists between the two, so the dielectric constant of the antenna medium 112 is required to be different from the dielectric constant of air.

[0047] Further, the spacing between the first antenna 1042 and the second antenna 1044 is equal everywhere, and the spacing is half the wavelength of the electromagnetic wave radiated outward.

[0048] By limiting the first antenna 1042 and the second antenna 1044 to be arranged completely in parallel, that is, the spacing between the two is equal everywhere, the weakening effect on the far-field performance of the antenna can be greatly reduced, that is, the far-field performance of the antenna is ensured. On this basis, by limiting the spacing between the two to be half the wavelength of the electromagnetic wave, the maximum phase difference is generated, thereby improving the radiation weakening ability.

[0049] It can be understood that the specific absorption rate is |E 2 |σ / ρ (E is the field strength, and σ and ρ are the conductivity and density of human tissue, respectively), and obviously the specific absorption rate is proportional to the square of the field strength, so the optimal phase cancellation condition is 180 degrees, and the spacing between the two antennas is half the wavelength of the electromagnetic wave.

[0050] Further, the antenna structure 100 further comprises a break structure 114 arranged on the first antenna 1042 and the second antenna 1044, and the break structure 114 is a non-conductive body. In the circumferential direction of the first antenna 1042, the break structure 114 cuts off the first antenna 1042, and in the circumferential direction of the second antenna 1044, the break structure 114 cuts off the second antenna 1044.

[0051] By arranging the break structure 114 of the non-conductive body on the first antenna 1042 and the second antenna 1044, the normal radiation of the first antenna 1042 and the second antenna 1044 outward can be ensured. Generally, the first antenna 1042 and the second antenna 1044 are arranged on the middle frame, and the middle frame can be selected to have a metal or plastic material according to different design requirements. If a metal is selected, it may shield the antenna and affect normal communication. Therefore, by arranging the break structure 114, the functionality of the antenna structure 100 can be effectively improved.

[0052] In the structure 114, the first antenna 1042 and the second antenna 1044 can be independently provided with the structure 114, and the structure 114 can be connected to the first antenna 1042 and the second antenna 1044 to simultaneously cut off the two antennas.

[0053] Further, the first antenna 1042 is shaped to match the edge of the frame 102, and the second antenna 1044 is arranged on the edge of the frame 102.

[0054] By limiting the shape of the first antenna 1042 to match the edge of the frame 102, the first antenna 1042 can be perfectly installed on the frame 102. On this basis, the second antenna 1044 is directly arranged on the edge of the frame 102, and the first antenna 1042 is arranged in the inner region, so as to reduce the radiation of the human body under the joint action of the two antennas.

[0055] In a specific embodiment, an antenna unit is provided, which includes a metal middle frame (i.e., the frame 102) and an antenna structure. The antenna structure includes an antenna notch, a metal edge frame with a groove structure (i.e., the first antenna 1042 and the second antenna 1044), a feeding structure 108, and a ground return structure.

[0056] The antenna unit can be applied to monopole antennas, IFA antennas, loop antennas, and T antennas, and is not limited to the above-mentioned antenna types. The antenna is fed to the metal inside the edge frame, and the feeding form can be a straight feeding of a spring or a coupled feeding. According to the antenna form, it is determined whether the ground return structure is needed, which can be a spring ground return or a structure flap.

[0057] The metal edge frame with a groove structure can be a U-shaped groove as shown in Figure 2 and Figure 3 , or can be a U-shaped groove as shown in Figure 3 . Figure 2parallel grooves without metal connection on both sides, the advantage of U-shaped groove is that it is easy to process, and the current on both sides can be strictly equal-amplitude and same direction, while the advantage of parallel groove is that the electric field formed by the two sides of metal in the SAR measurement plane has better difference effect than U-shaped groove. The groove-shaped metal frame structure can be applied to the terminal globally or as a frame structure in a local area. Both U-shaped groove and parallel groove structure require strict symmetry of the metal on both sides, so the metal groove-shaped structure of the case can be considered as an extension of the single-frame antenna in structure, and its current distribution, working mode and design method are consistent with those of the single-frame antenna without groove. Specifically, the current on both sides of the groove is equal-amplitude, same frequency and same direction (parallel groove is not strictly equal-amplitude), and the current is same frequency and same direction to ensure that the far-field performance (efficiency or gain) of the antenna is not compromised, and the current is same amplitude to reduce the near-field electric field to the greatest extent, thereby achieving the effect of reducing SAR.

[0058] The working principle of the SAR reduction system is that the metal frame of the groove structure radiates electromagnetic waves outward as the radiation body, and the radiation electric field of the metal on both sides of the groove can form a phase difference in a certain plane, and the phase difference size is different with the working frequency and position, but as long as there is a phase difference, the near electric field in a certain plane will have a certain cancellation effect. As shown in Figure 4 , the currents on both sides of the groove are equal-amplitude and same-direction currents I and I', and the near electric fields generated by them at a certain point a on the SAR measurement plane are E and E'. Since the near electric fields generated by the two current sources have a path difference when radiated to point a, the two electric fields will have a phase difference at point a, thereby having a field strength cancellation effect at this point. Of course, there are also points on this plane where the two near electric fields have no path difference, but since SAR is the average value of a certain hot spot area, it will not measure the position without phase difference to cause no SAR reduction effect.

[0059] From the formula SAR = |E 2 |σ / ρ (E is the field strength, and σ and ρ are the conductivity and density of human tissue, respectively), it can be seen that SAR and the square of the field strength are in a proportional relationship. Therefore, the optimal condition for phase cancellation is when the phase difference is 180 degrees and the distance between the two frames satisfies 1 / 2 wavelength, but in fact, as long as there is a gap, there will be a phase difference, and the electric field will change.

[0060] In another specific embodiment, as shown in Figure 5 , in addition to the features mentioned in the previous specific embodiment, a medium with different dielectric constants can be filled in the groove-shaped structure. The wavelength of electromagnetic waves in the medium is Wherein λ is the medium wavelength, λ0 is the free space wavelength, ε is the dielectric constant. It can be seen that, with the addition of the medium material, different dielectric constants can change the medium wavelength of the electromagnetic wave, so as to change the phase difference of the near electric field. In other words, compared with the previous embodiment, the present embodiment can achieve the purpose of controlling the phase difference through medium filling in the slot.

[0061] As shown in Figure 6 Another embodiment of the present application provides an electronic device 200, comprising a device body 202 and an antenna structure 100, wherein the basic function of communication of the electronic device 200 is realized by arranging the antenna structure 100 on the device body 202. On this basis, since the electronic device 200 comprises the antenna structure 100 in any of the above embodiments, it has the beneficial effects of any of the above embodiments, which will not be described here.

[0062] Among them, the electronic device 200 can be a smart phone, a tablet, a smart watch, a smart bracelet or other devices that can emit electromagnetic waves for communication.

[0063] According to the embodiment of the electronic device of the present application, by arranging the first antenna and the second antenna with a gap at the same time, a radiated electric field with a phase difference can be generated under the joint action of the two, so as to make the near electric field produce a certain mutual cancellation effect, and thus the radiation of the whole electronic device to the human body will be reduced under the joint action of the two antennas themselves.

[0064] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "a specific embodiment" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are contained in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0065] The above is only the preferred embodiment of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An antenna structure, characterized by The antenna structure comprises: a frame; a first antenna and a second antenna arranged on the frame; wherein the second antenna is arranged outside the first antenna, and the first antenna and the second antenna are arranged in a spaced manner; wherein when the first antenna and the second antenna radiate electromagnetic waves outward, the currents in the first antenna and the second antenna are of the same frequency and the same direction, and the radiated electric field has a phase difference; the antenna structure further comprises: a connecting plate arranged on one side of the first antenna and the second antenna, and the two ends of the connecting plate are connected with the first antenna and the second antenna respectively, and the currents in the first antenna and the second antenna are communicated through the connecting plate; wherein the first antenna, the second antenna and the connecting plate form a slot-shaped structure.

2. The antenna structure of claim 1, wherein, At least part of the first antenna and at least part of the second antenna are arranged in parallel.

3. The antenna structure of claim 1, wherein, The antenna structure comprises: a feed structure arranged on the first antenna.

4. The antenna structure of claim 1, wherein, Further comprising: a ground return structure arranged on the first antenna, one end of the ground return structure being connected to the ground.

5. The antenna structure of any one of claims 1 to 4, wherein, Further comprising: an antenna medium arranged between the first antenna and the second antenna.

6. The antenna structure of any one of claims 1 to 4, wherein, The distance between the first antenna and the second antenna is equal everywhere, and the distance is half of the wavelength of the outwardly radiated electromagnetic wave.

7. The antenna structure of claim 1, wherein, The antenna structure comprises: a break structure arranged on the first antenna and the second antenna, the break structure being a non-conductive body; wherein in the circumferential direction of the first antenna, the break structure cuts off the first antenna, and in the circumferential direction of the second antenna, the break structure cuts off the second antenna.

8. The antenna structure of claim 1, wherein, The shape of the first antenna is matched with the edge shape of the frame, and the second antenna is arranged on the edge of the frame.

9. An electronic device, comprising: The antenna structure comprises: a device body; the antenna structure according to any one of claims 1 to 8 is arranged on the device body.

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