Antenna device and electronic equipment

Abstract

The invention provides an antenna device, and relates to the technical field of communication. The antenna device comprises a main radiation branch knot which comprises a first free end, a feeding point and a second free end; the parasitic branch knot comprises a third free end and a fourth free end, and a coupling gap is arranged between the second free end and the third free end; and the feed source feeds a feed signal into the main radiation branch knot through the feed point, and is coupled with the parasitic branch knot through the coupling gap so as to excite the main radiation branch knot and the parasitic branch knot to respectively generate a 1 / 2 wavelength mode supporting a low-frequency band. By adopting the scheme, the antenna efficiency of the antenna device can be improved, and the antenna performance of the antenna device is relatively high.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of communication, in particular to an antenna device and an electronic device. BACKGROUND

[0002] With the development of technology, the popularity of communication function electronic devices (for example, mobile phones, tablets, etc.) is higher and higher, and the functions are more and more powerful. The antenna device is usually included in the electronic device to realize the communication function of the electronic device.

[0003] At present, electronic devices are increasingly iterated towards full screen and ultra-thin direction, and the antenna environment is increasingly deteriorating, resulting in increasingly unsatisfactory low-frequency antenna performance. SUMMARY

[0004] Therefore, it is necessary to provide an antenna device and an electronic device, which can improve the antenna performance of the antenna device.

[0005] In a first aspect, the present application provides an antenna device, comprising:

[0006] a main radiation branch including a first free end, a feed point and a second free end;

[0007] a parasitic branch including a third free end and a fourth free end, and a coupling gap is arranged between the second free end and the third free end;

[0008] a feed source, which feeds a feed signal to the main radiation branch through the feed point, and is coupled with the parasitic branch through the coupling gap, so as to excite the main radiation branch and the parasitic branch to generate 1 / 2 wavelength mode supporting a low-frequency band respectively.

[0009] In a second aspect, the present application further provides an electronic device comprising the antenna device as described in the first aspect.

[0010] The above-mentioned antenna device and electronic device include a main radiation branch, a parasitic branch and a feed source. The main radiation branch includes a first free end, a feed point and a second free end. The parasitic branch includes a third free end and a fourth free end. A coupling gap is arranged between the second free end and the third free end. The main radiation branch is coupled with the parasitic branch through the coupling gap. Then, after the feed source feeds a feed signal to the main radiation branch through the feed point, the main radiation branch and the parasitic branch generate 1 / 2 wavelength mode supporting a low-frequency band respectively. Since the main radiation branch and the parasitic branch excite the same wavelength mode under the excitation of the feed signal, the currents on the main radiation branch and the parasitic branch are in phase, thereby improving the antenna efficiency of the antenna device and enhancing the antenna performance of the antenna device. BRIEF DESCRIPTION OF DRAWINGS

[0011] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of the antenna device in one embodiment of this application;

[0013] Figure 2 This is a structural diagram of an electronic device in one embodiment of this application;

[0014] Figure 3 This is a structural diagram of an electronic device in the related art;

[0015] Figure 4 This is a structural diagram of another electronic device in the related technology;

[0016] Figure 5 This is a simulated standing wave diagram of the antenna device in one embodiment of this application;

[0017] Figure 6 This is a simulation comparison diagram of the antenna device in one embodiment of this application and the antenna of related technologies in terms of S-parameters;

[0018] Figure 7 This is a simulation comparison diagram of the antenna device in one embodiment of this application and the antenna of related technologies in terms of radiation efficiency and system efficiency;

[0019] Figure 8 This is a schematic diagram of the antenna device in another embodiment of this application;

[0020] Figure 9 This is a schematic diagram of the antenna device in yet another embodiment of this application;

[0021] Figure 10 for Figure 8 or Figure 9 Simulation comparison of the S-parameters of the corresponding antenna device and antennas of related technologies;

[0022] Figure 11 This is a block diagram of the internal structure of an electronic device in one embodiment.

[0023] Explanation of reference numerals in the attached figures:

[0024] 10 - antenna device, 100 - electronic device, 11 - main radiating branch, 12 - parasitic branch, 13 - coupling slot, 14 - feed, 15 - tuning circuit, 20 - conductive frame, 201 - top frame, 202 - first side frame, 203 - bottom frame, 204 - second side frame, 21 - main board, 22 - battery, 30 - conductive frame, 301 - radiating branch, 302 - radiating branch, 31 - main board, 32 - battery, 50 - mobile phone, 51 - memory, 511 - operating system, 512 - communication module, 513 - GPS module, 52 - processing circuit, 53 - I / O subsystem, 531 - button, 54 - antenna device, 55 - signal line. DETAILED DESCRIPTION

[0025] For the purpose of promoting the understanding and facilitating appreciation of the present application, the disclosure hereof will be described in conjunction with preferred embodiments related to the figures. It is to be understood, however, that the described embodiments are merely given by way of example and are not intended to limit the present application to any form described herein. Rather, the present application is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the application.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application.

[0027] It should be understood that the terms "first", "second" and so on as used herein are used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish the first element from another element.

[0028] It should be understood that "connection" in the following embodiments means that the connected circuit, module, unit, etc. have electrical signal or data transmission between each other, and should be understood as "electrical connection", "communication connection" and the like.

[0029] It should be understood that "at least one" means one or more, and "multiple" means two or more. "At least part of the element" means part or all of the element.

[0030] As used herein, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. It should also be understood that the term "comprising" or "including" or "having" and the like, specifies the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

[0031] Low-frequency bands are favored by operators because of their low frequency and long wavelength, which result in low transmission loss, long propagation distance, and strong anti-interference ability in long-distance communication.

[0032] However, current electronic devices are increasingly iterating towards full-screen and ultra-thin designs. Low-frequency antennas, due to their low operating frequency, require a large antenna size. However, existing electronic devices often do not have much space for low-frequency antennas. Therefore, the low-frequency antennas used in current electronic devices usually adopt the CRLH (composite left-handed) mode. Their operating mode is usually only 1 / 8 of the wavelength corresponding to the low-frequency operating frequency, resulting in low antenna efficiency and thus poor performance.

[0033] For the reasons mentioned above, such as Figure 1 As shown, this application provides an antenna device 10, which has good antenna performance. For example... Figure 2 As shown, the antenna device 10 involved in this application embodiment can be applied to an electronic device 100 with wireless communication function. The electronic device 100 can be a handheld device, an in-vehicle device, a wearable device, a computing device, or other processing devices connected to a wireless modem, as well as various forms of user equipment (UE) (e.g., mobile phone), mobile station (MS), etc. For ease of description, the devices mentioned above are collectively referred to as electronic device 100.

[0034] like Figure 1 According to the present application embodiment, an antenna device 10 is provided, including: a main radiating stub 11, a parasitic stub 12, and a feed 14.

[0035] The main radiating stub 11 includes a first free end A, a feed point S, and a second free end B. The parasitic stub 12 includes a third free end C and a fourth free end D. A coupling gap 13 is provided between the second free end B and the third free end C. The gap can be equivalent to a capacitor, so that the main radiating stub 11 and the parasitic stub 12 are capacitively coupled. The feed source 14 can be a device that generates a feed signal (or excitation signal). The feed source 14 feeds the feed signal to the main radiating stub 11 through the feed point S, so that the main radiating stub 11 is coupled to the parasitic stub 12 through the coupling gap 13, thereby exciting the main radiating stub 11 and the parasitic stub 12 to generate 1 / 2 wavelength modes supporting the low-frequency band.

[0036] It should be noted that the range of the low frequency (Low Band, LB) band is below 1000 MHz. Among them, the low frequency band of the embodiment can include part or all of the low frequency band of 4G-LTE and 5G-NR. The main radiation branch 11 is coupled with the parasitic branch 12 through the coupling slot 13, and the main radiation branch 11 and the parasitic branch 12 respectively generate a 1 / 2 wavelength mode supporting the low frequency band. It can be understood that the main radiation branch 11 and the parasitic branch 12 can be respectively used for receiving radio frequency signals of the low frequency band, or the main radiation branch 11 and the parasitic branch 12 can be respectively used for transmitting radio frequency signals of the low frequency band, or the main radiation branch 11 and the parasitic branch 12 can be respectively used for receiving and transmitting radio frequency signals of the low frequency band. And the 1 / 2 wavelength mode can excite the longitudinal mode current of the floor of the electronic device 100. Since the longitudinal size of the electronic device 100 (such as a mobile phone) is often larger than the transverse size, the longitudinal mode has higher radiation efficiency, thereby making the antenna radiation efficiency higher.

[0037] Among them, the material of the main radiation branch 11 and the parasitic branch 12 is not specifically limited. The material of the main radiation branch 11 and the parasitic branch 12 is respectively a conductive material, including but not limited to a metal, an alloy and the like. The shape of the main radiation branch 11 and the parasitic branch 12 is determined according to actual needs, and the shape of the main radiation branch 11 and the parasitic branch 12 includes but is not limited to a strip, a sheet, a rod, a coating, a film and the like. Figure 1 The main radiation branch 11 and the parasitic branch 12 shown are only an example and cannot limit the shape of the main radiation branch 11 and the parasitic branch 12 provided by the embodiment.

[0038] The application does not specifically limit the form of the main radiation branch 11 and the parasitic branch 12. Exemplarily, the main radiation branch 11 and the parasitic branch 12 can be one of a flexible printed circuit (FPC) antenna radiator, a laser direct structuring (LDS) antenna radiator, a print direct structuring (PDS) antenna radiator, and a metal radiation branch. In the embodiment of the application, the type of the main radiation branch 11 and the parasitic branch 12 is not limited further, and the type of the main radiation branch 11 and the parasitic branch 12 can be the same or different. In the embodiment of the application, in order to facilitate the description, the main radiation branch 11 and the parasitic branch 12 are metal radiation branches, for example, the conductive frame 20 of the electronic device 100 is taken as an example for description.

[0039] The free end in the application refers to one end of the floor disconnected and not electrically connected with other conductive parts on the conductive frame 20 through an insulating break. Among them, the insulating break can be filled with an insulating material.

[0040] It should be noted that in the related art, as shown in Figure 3 , a low-frequency antenna used in an electronic device is usually in a CRLH (Composite Right and Left Hand) mode, because its working mode is usually only 1 / 8 of the wavelength corresponding to the low-frequency working frequency; but this mode has low efficiency, and the free-space efficiency is usually below -7 dB, and to achieve an efficiency of about -7 dB, the antenna ground needs to be located at the four corners of the electronic device, such as Figure 3 , in which the mainboard 31 and the battery 32 of the electronic device are arranged longitudinally, the radiating branch 301 of the antenna is located on the conductive frame 30 and is arranged on the conductive frame 30 at the upper right corner of the electronic device 100, and the ground is located at the corner of the electronic device to better excite the longitudinal mode of the floor of the electronic device, and the antenna efficiency can be better. But this kind of low-frequency antenna often occupies the entire corresponding area of the mainboard 31, which makes this area unable to layout other antennas.

[0041] As shown in Figure 4 , in another related art, in order to layout other antennas in the mainboard 31 area of the electronic device, another low-frequency antenna form is to locate the antenna ground in the middle of the electronic device, as shown in Figure 4 , the mainboard 31 and the battery 32 of the electronic device are arranged longitudinally, the radiating branch 301 is located on the conductive frame 30, and the mainboard 31 and the battery 32 are partially overlapped with the radiating branch 301 in the orthographic projection of the radiating branch. In this form, the radiating branch 301 of the antenna can allow the mainboard 21 area to layout other frequency band antennas, but this kind of antenna excites the horizontal current mode of the floor, and since the horizontal size of the floor is short, the efficiency of this kind of low-frequency antenna is usually only about -9 dB.

[0042] In the embodiment, the main radiating branch 11 and the parasitic branch 12 can be located in the middle of the electronic device 100 and will not occupy the entire corresponding area of the mainboard 21. And by coupling the coupling slot 13 with the parasitic branch 12, the main radiating branch 11 and the parasitic branch 12 respectively generate a 1 / 2 wavelength mode supporting the low-frequency band under the excitation of the feed signal fed into the main radiating branch 11 by the feed point S. Since the main radiating branch 11 and the parasitic branch 12 excite the same wavelength mode under the excitation of the feed signal, the currents on the main radiating branch 11 and the parasitic branch 12 are in phase, thereby the antenna efficiency of the antenna device 10 can be improved to improve the antenna performance of the antenna device 10.

[0043] The antenna device 10 comprises a main radiating branch 11, a parasitic branch 12 and a feed 14. The main radiating branch 11 comprises a first free end A, a feed point S and a second free end B. The parasitic branch 12 comprises a third free end C and a fourth free end D. A coupling gap 13 is arranged between the second free end B and the third free end C. The main radiating branch 11 is coupled to the parasitic branch 12 through the coupling gap 13. When the feed 14 feeds a feed signal to the main radiating branch 11 through the feed point S, the main radiating branch 11 and the parasitic branch 12 generate a 1 / 2 wavelength mode supporting a low frequency band respectively. Since the main radiating branch 11 and the parasitic branch 12 are excited to generate the same wavelength mode under the excitation of the feed signal, the currents on the main radiating branch 11 and the parasitic branch 12 are in phase, thereby improving the antenna efficiency of the antenna device 10 and enhancing the antenna performance of the antenna device 10.

[0044] In one embodiment, as shown in Figure 1 and Figure 2 , the portion between the feed point S and the second free end B of the main radiating branch 11 supports the 1 / 2 wavelength mode. The portion between the third free end C and the fourth free end D of the parasitic branch 12 supports the 1 / 2 wavelength mode.

[0045] The feed 14 feeds a feed signal to the main radiating branch 11 through the feed point S to excite the main radiating branch 11 to generate a first resonant mode supporting a low frequency band. The main radiating branch 11 is coupled to the parasitic branch 12 through the coupling gap 13, and the parasitic branch 12 generates a second resonant mode supporting a low frequency band. Correspondingly, in the first resonant mode, the current flow of the main radiating branch 11 is mainly from A (the branch position point corresponding to the feed point S) to B (the second free end B of the second radiating body 12). In the second resonant mode, the current flow of the parasitic branch 12 is mainly from the third free end C to the fourth free end D of the parasitic branch 12. The first resonant mode is the 1 / 2 wavelength mode resonating between the feed point S and the second free end B of the main radiating branch 11, and the second resonant mode is the 1 / 2 wavelength mode resonating between the third free end C and the fourth free end D of the parasitic branch 12. Therefore, the entire low frequency antenna is equivalent to being radiated by the main radiating branch 11 and the parasitic branch 12 together, and the currents on the main radiating branch 11 and the parasitic branch 12 are in phase. Thus, the antenna size is greatly increased compared with the conventional mode antenna. Obviously, the antenna efficiency of the antenna device 10 of the embodiment is also greatly increased compared with the antenna efficiency of the conventional mode antenna.

[0046] In one embodiment, as shown in Figure 1 and Figure 2As shown, the gap width of the coupling slot 13 is within a preset range, so as to change the boundary condition of the electromagnetic wave passing through the slot, so that the electric field component in the normal direction at the slot is more than that in the tangential direction, which is parallel to the direction from the second free end B to the third free end C. It should be noted that, Figure 1 and Figure 2 wherein d represents the gap width of the coupling slot 13.

[0047] It should be noted that the gap width of the coupling slot 13 is the size of the coupling slot 13 from the second free end B to the third free end C.

[0048] In the related art, the electric field at the slot is mostly distributed in the tangential direction, so the coupling between the main radiation branch 11 and the parasitic branch 12 is weak.

[0049] In this embodiment, by limiting the gap width of the coupling slot 13 within a preset range, the boundary condition of the electromagnetic wave passing through the slot is changed, so that the electric field component in the normal direction at the slot is more than that in the tangential direction, thereby increasing the coupling between the main radiation branch 11 and the parasitic branch 12, making the resonant current of the main radiation branch 11 more coupled to the parasitic branch 12, so that the 1 / 2 dipole mode of the parasitic branch 12 is fully excited, that is, the current on the parasitic branch 12 is strong, and since the currents on the main radiation branch 11 and the parasitic branch 12 are in phase, the antenna efficiency of the antenna is greatly improved, thereby improving the antenna performance of the antenna device 10.

[0050] In one embodiment, as shown in Figure 1 and Figure 2 The gap width of the coupling slot 13 is 0.1mm-0.7mm.

[0051] For example, the gap width of the coupling slot 13 can be 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm. For another example, the gap width of the coupling slot 13 can be 0.2mm. It should be noted that the above gap width examples are only part of the examples in this embodiment, and the gap width of the coupling slot 13 can be any value between 0.1mm-0.7mm.

[0052] In the related art, the gap width of the antenna slot is often 1mm.

[0053] It can be understood that the overall structure consisting of the main radiating stub 11, the parasitic stub 12, and the coupling slot 13 can be equivalent to a capacitor. The capacitance of a capacitor is inversely proportional to the distance between the plates; that is, the smaller the distance between the capacitor plates, the larger the capacitance. The width of the coupling slot 13 corresponds to the distance between the capacitor plates. The width of the coupling slot 13 is 0.1mm-0.7mm, which is significantly reduced compared to related technologies. Therefore, the capacitance of the equivalent capacitor is significantly increased compared to related technologies, which greatly increases the coupling between the main radiating stub 11 and the parasitic stub 12. This allows more of the resonant current of the main radiating stub 11 to couple to the parasitic stub 12, thereby fully exciting the 1 / 2 dipole mode of the parasitic stub 12. In other words, the current on the parasitic stub 12 is stronger. Since the currents on the main radiating stub 11 and the parasitic stub 12 are in phase, the antenna efficiency of the antenna is greatly improved, thereby improving the antenna performance of the antenna device 10.

[0054] In one embodiment, such as Figure 1 and Figure 2 As shown, the lengths of the main radiating branch 11 and the parasitic branch 12 (i.e., the lengths of AB and CD) range from 40 to 60 mm.

[0055] For example, the length of the main radiating branch 11 can be 40mm, 41mm, 42mm, 43mm, 44mm, 45mm, 46mm, 47mm, 48mm, 49mm, 50mm, 51mm, 52mm, 53mm, 54mm, 55mm, 56mm, 57mm, 58mm, 59mm, or 60mm, and the length of the parasitic branch 12 can be 40mm, 41mm, 42mm, 43mm, 44mm, 45mm, 46mm, 47mm, 48mm, 49mm, 50mm, 51mm, 52mm, 53mm, 54mm, 55mm, 56mm, 57mm, 58mm, 59mm, or 60mm. Alternatively, the lengths of both the main radiating branch 11 and the parasitic branch 12 can be 50mm. It should be noted that the above length examples are only some examples in this embodiment, and the main radiating branch 11 and the parasitic branch 12 can be any length between 40-60 mm.

[0056] Among them, the main radiating branch 11 and the parasitic branch 12 respectively support the 1 / 2 wavelength mode in the low frequency band. The length of the main radiating branch 11 and the parasitic branch 12 is determined according to the operating mode. Since the main radiating branch 11 and the parasitic branch 12 need to operate in the 1 / 2 wavelength dipole mode in the low frequency band in this application, the length of the main radiating branch 11 and the parasitic branch 12 needs to be within a reasonable range and the lengths of the main radiating branch 11 and the parasitic branch 12 need to be close.

[0057] In the embodiment, the length of the main radiating branch 11 and the parasitic branch 12 ranges from 40mm to 60mm, so that the size of the main radiating branch 11 and the parasitic branch 12 can support the 1 / 2 wavelength dipole mode in the low frequency band. In the related art, the low frequency antenna generally works in the 1 / 4 wavelength mode, and the size of the low frequency antenna is generally less than 50mm, and the working bandwidth of the antenna is narrow. Compared with the related art, the main radiating branch 11 and the parasitic branch 12 of the embodiment need to work in the 1 / 2 wavelength dipole mode in the low frequency band, which corresponds to a substantial increase in the physical size of the antenna device 10, and the increase in the physical size of the antenna device 10 can further improve the radiation efficiency of the antenna, so that the antenna efficiency of the antenna device 10 of the embodiment is substantially improved compared with the related art, that is, the antenna performance of the antenna device 10 of the embodiment is substantially improved compared with the related art.

[0058] For example, the length of the main radiating branch 11 of the embodiment is 60mm, the length of the parasitic branch 12 of the embodiment is 50mm, and the length of the low frequency antenna in the related art is 44mm. Correspondingly, the length of the antenna device 10 of the embodiment is 2.5 times the length of the low frequency antenna in the related art, so the size of the antenna device 10 of the embodiment is substantially increased compared with the related art, so that the antenna efficiency can be substantially improved.

[0059] In one embodiment, as shown in Figure 1 and Figure 2 , the length ratio of the main radiating branch 11 and the parasitic branch 12 ranges from 0.8 to 1.2, that is, the length ratio of AB and CD ranges from 0.8 to 1.2.

[0060] For example, the length ratio of the main radiating branch 11 and the parasitic branch 12 can be 0.8, 0.9, 1, 1.1, 1.2. For another example, the length ratio of the main radiating branch 11 and the parasitic branch 12 can be 1. It should be noted that the above ratio examples are only part of the examples in the embodiment, and the length ratio of the main radiating branch 11 and the parasitic branch 12 can be any value in the range of 0.8 to 1.2.

[0061] It can be understood that by setting the length ratio of the main radiating branch 11 and the parasitic branch 12 to be in the range of 0.8 to 1.2, the lengths of the main radiating branch 11 and the parasitic branch 12 are close to each other, and the main radiating branch 11 and the parasitic branch 12 can support the 1 / 2 wavelength dipole mode in the low frequency band, so that the radiation efficiency of the antenna device 10 is better and the working bandwidth is larger.

[0062] In one embodiment, the feeding point S is arranged close to the first free end A.

[0063] It can be understood that, as shown in the figure, the feed source 14 can feed the feed signal to the main radiation branch 11 through the feed point S, and the part of the main radiation branch 11 between the feed point S and the second free end B is excited to generate the 1 / 2 wavelength mode supporting the low frequency band. Since the first free end A is the end of the main radiation branch 11 away from the coupling slot 13, by setting the feed point S close to the first free end A, the entire main radiation branch 11 can be approximately made to generate the 1 / 2 wavelength mode supporting the low frequency band, so that the effective length of the main radiation branch 11 supporting the 1 / 2 wavelength mode is higher, thereby improving the radiation efficiency of the main radiation branch 11, and further improving the radiation efficiency of the antenna device 10.

[0064] Based on the above embodiments, in one example, the slot width of the coupling slot 13 is 0.2 mm, the length of the main radiation branch 11 is 60 mm, the length of the parasitic branch 12 is 50 mm, and the main radiation branch 11 and the parasitic branch 12 support the 1 / 2 wavelength dipole mode of the low frequency band. As shown in Figure 5 , Figure 5 is the simulation standing wave diagram of the present example, S11 represents the input reflection coefficient, the curve corresponding to 41 represents the total efficiency of the system, the curve corresponding to 42 represents the S11 parameter, and the curve corresponding to 43 represents the antenna radiation efficiency. Compared with the S parameters of the conventional low frequency antenna (i.e. the low frequency antenna in the related art, such as the antenna in Figure 3 or Figure 4 , the results are shown in Figure 6 , the curve corresponding to 42 represents the S11 parameter of the antenna of the present application, and the curve corresponding to 44 represents the S11 parameter of the antenna of the related art. The antenna device 10 of the present application has one more resonance point than the antenna of the related art. This resonance is generated by the parasitic branch 12 of the present application. Due to the loading of the parasitic branch 12, the radiation efficiency of the antenna device 10 is greatly increased. Figure 7 is the comparison diagram of the antenna device 10 of the present application and the antenna of the related art in terms of radiation efficiency and system efficiency. The peak radiation efficiency of the antenna device 10 of the present application is improved by nearly 4 dB compared with the system peak efficiency of the antenna scheme of the related art.

[0065] In one embodiment, as shown in Figure 8 and Figure 9 , the parasitic branch 12 further includes a grounding point. The antenna device 10 further includes a tuning circuit 15 connected to the grounding point and the common ground respectively, and the tuning circuit 15 is used to select a tuning path between the grounding point and the common ground.

[0066] The tuning circuit 15 may include a switch to control the opening and closing of the tuning path between the grounding point and the common ground. Further, the tuning path may include at least one tuning element, which can be a capacitor, resistor, or inductor. It should be noted that, based on the impedance characteristics of a capacitor, lower frequency signals are easily blocked by the capacitor, while higher frequency signals easily reach the output terminal through the capacitor; thus, the capacitor can block lower frequency signals from returning to ground. Correspondingly, based on the impedance characteristics of an inductor, the inductor can block higher frequency signals from returning to ground. Therefore, by appropriately setting the tuning element, after the tuning path is turned on, the standing wave position of the parasitic stub 12 can be adjusted, thereby adjusting the frequency band supported by the parasitic stub 12.

[0067] In this embodiment, the tuning circuit 15 is designed according to actual needs. When the tuning circuit 15 conducts the tuning path between the ground point and the common ground, the standing wave position of the parasitic stub 12 can be adjusted to the low-frequency operating band, thereby improving the low-frequency operating bandwidth and thus improving the operating bandwidth of the antenna device 10.

[0068] Figure 10 This is a simulation comparison diagram of the antenna device 10 after the tuning circuit 15 of this application is turned on, and the antenna of related technologies in terms of S-parameters, as shown in the figure. Figure 10 As shown, after the tuning circuit 15 is turned on, the standing wave position of the parasitic stub 12 can be adjusted to the low-frequency operating band, thereby improving the low-frequency operating bandwidth.

[0069] In one embodiment, such as Figure 8 and Figure 9 As shown, the grounding point is set close to the third free end C or the fourth free end D.

[0070] It is understandable that by setting the grounding point close to the third free end C or the fourth free end D, the current return point of the parasitic branch 12 is located near the third free end C or the fourth free end D, so that the parasitic branch 12 still functions as a radiating branch as a whole, thus ensuring the radiation efficiency of the parasitic branch 12.

[0071] The tuning circuit 15 is connected to both the grounding point and the common ground. The position of the tuning circuit 15 corresponds to the position of the grounding point, and it is positioned near either the third free end C or the fourth free end D. It should be noted that regardless of whether the grounding point is positioned near the third free end C or the fourth free end D, the position of the standing wave of the parasitic stub 12 can be adjusted to within the low-frequency operating band by turning on the tuning circuit 15, thereby increasing the low-frequency operating bandwidth of the parasitic stub 12 and consequently increasing the operating bandwidth of the antenna device 10.

[0072] In one embodiment, such as Figure 1 As shown, the main radiating branch 11 and the parasitic branch 12 extend in the same direction.

[0073] It can be understood that the main radiating branch 11 and the parasitic branch 12 extend in the same direction, so the size of the antenna device 10 in the extending direction is relatively large. For example, the main radiating branch 11 and the parasitic branch 12 can be arranged on the side of the conductive frame 20 of the mobile phone, and the sum of the lengths of the main radiating branch 11 and the parasitic branch 12 in the longitudinal direction is relatively large. In addition, the 1 / 2 wavelength mode of the main radiating branch 11 and the parasitic branch 12 can excite the longitudinal mode current of the mobile phone floor. Correspondingly, since the longitudinal size of the mobile phone is larger than the lateral size, the overall size of the antenna device 10 is relatively large, the radiation efficiency of the antenna device 10 is relatively high, and the bandwidth is relatively large.

[0074] In an embodiment, the antenna device 10 further comprises a floor (not shown in the figure); wherein the floor comprises a first side and a second side connected with the first side, and the length of the second side is larger than the length of the first side. In general, the shape of the floor is approximately rectangular. In the mobile phone, various slots, holes and the like are arranged on the reference ground side of the reference floor according to the needs of arranging devices or avoiding other structures. The reference floor can include but is not limited to the metal alloy part of the middle plate and the reference ground metal part of the circuit board (including the main board 21 and the auxiliary board). In general, the common ground system in the electronic device 100 can be equivalent to an approximately rectangular shape, so it is called a floor. It should be noted that the floor does not mean that the shape of the common ground is plate-shaped and is a rectangular plate.

[0075] In the embodiment, the extending direction of the main radiating branch 11 and the parasitic branch 12 is the same as the extending direction of the second side.

[0076] It can be understood that the current on the floor also contributes to the radiation of the antenna device 10. Since the extending direction of the main radiating branch 11 and the parasitic branch 12 is the same as the extending direction of the second side, after the feed source 14 feeds the feed signal to the main radiating branch 11 through the feed point S, the resonant current of the main radiating branch 11 and the parasitic branch 12 also excites the floor to generate a resonant current. The resonant current of the floor is opposite to the current of the main radiating branch 11, and the current on the floor is parallel to the direction of the second side. Since the length of the second side of the floor is larger than the length of the first side, the floor has a higher radiation efficiency, so that the radiation efficiency of the antenna device 10 is relatively high.

[0077] In an embodiment, the antenna device 10 excites the floor to generate a longitudinal mode current while exciting the main radiating branch 11 and the parasitic branch 12 to generate a 1 / 2 wavelength mode supporting a low frequency band. The direction of the longitudinal mode current is the same as the extending direction of the second side.

[0078] It can be understood that the antenna device 10, while exciting the main radiation branch 11 and the parasitic branch 12 to generate the 1 / 2 wavelength mode supporting the low frequency band respectively, will excite the floor to generate a resonant current, the flow direction of the resonant current is parallel to the extension direction of the second side, that is, the floor will generate a corresponding longitudinal mode current. Since the length of the second side of the floor is greater than the length of the first side, the floor has higher radiation efficiency, so that the radiation efficiency of the antenna device 10 is higher. Exemplarily, taking that the antenna device 10 is applied to a mobile phone as an example, the main radiation branch 11 and the parasitic branch 12 can be arranged on the side of the conductive frame 20 of the mobile phone, that is, longitudinally arranged. Corresponding to the antenna device 10, the floor will generate a longitudinal mode current. Since the longitudinal size of the mobile phone is greater than the transverse size, the radiation efficiency of the antenna device 10 is higher, and the bandwidth is larger.

[0079] Based on the same inventive concept, in one embodiment, as shown in Figure 2 The application also provides an electronic device 100, which comprises the antenna device 10 according to any one of the above embodiments.

[0080] The electronic device 100 can be a handheld device, a vehicle-mounted device, a wearable device, a computing device or other processing device connected to a wireless modem, and various forms of user equipment (User Equipment, UE) (for example, a mobile phone), a mobile station (Mobile Station, MS) and the like.

[0081] The above-mentioned electronic device 100 comprises the antenna device 10 according to any one of the above embodiments, and the antenna device 10 comprises the main radiation branch 11, the parasitic branch 12 and the feed 14. The main radiation branch 11 comprises the first free end A, the feed point S and the second free end B. The parasitic branch 12 comprises the third free end C and the fourth free end D. The coupling gap 13 is arranged between the second free end B and the third free end C. The main radiation branch 11 is coupled to the parasitic branch 12 through the coupling gap 13. After the feed 14 feeds the feed signal to the main radiation branch 11 through the feed point S, the main radiation branch 11 and the parasitic branch 12 generate the 1 / 2 wavelength mode supporting the low frequency band respectively. Since the main radiation branch 11 and the parasitic branch 12 excite the same wavelength mode under the excitation of the feed signal, the currents on the main radiation branch 11 and the parasitic branch 12 are in phase, so that the antenna efficiency of the antenna device 10 can be improved, and the antenna performance of the antenna device 10 can be improved. Therefore, the communication performance of the electronic device 100 according to the embodiment of the application is higher.

[0082] In one embodiment, as shown in Figure 2 The electronic device 100 comprises a middle plate and a conductive frame 20 connected to the edge of the middle plate. The main radiation branch 11 and the parasitic branch 12 are arranged on the conductive frame 20 respectively.

[0083] The conductive frame 20 is disposed around the outer periphery of the display screen to support and protect it. The conductive frame 20 extends into the electronic device 100 to form a middle plate; the integrally formed middle plate and frame are sometimes referred to as the middle frame.

[0084] Taking a mobile phone as an example, the shape of the mobile phone display screen can be rectangular or rounded rectangle. A rounded rectangle, sometimes called a rounded rectangle, means that the four corners of the rectangle are rounded, and the four sides are roughly straight lines. A conductive frame 20 is located around the outer perimeter of the display screen to support and protect it. The conductive frame 20 can be made of metal materials such as aluminum alloy, magnesium alloy, or stainless steel. The conductive frame 20 can further extend into the interior of the electronic device 100 to form a middle plate. The display screen can be fixedly connected to the conductive frame 20 or the middle plate using processes such as adhesive dispensing.

[0085] In this embodiment, by setting the main radiating branch 11 and the parasitic branch 12 on the conductive frame 20 respectively, the conductive frame 20 is reused, avoiding the need to set up a separate radiator, which is conducive to the miniaturization of the electronic device 100 and the reduction of costs.

[0086] In one embodiment, such as Figure 2 As shown, the conductive frame 20 includes a top frame 201 and a bottom frame 203 disposed opposite to each other, and a first side frame 202 and a second side frame 204 disposed opposite to each other. The top frame 201, the first side frame 202, the bottom frame 203 and the second side frame 204 are connected end to end in sequence. The main radiating branch 11 and the parasitic branch 12 are respectively located on the target side frame, which is one of the first side frame 202 and the second side frame 204.

[0087] It is understood that the length of the side frame of the electronic device 100 is often greater than the length of the top frame 201 and the bottom frame 203. Therefore, by placing the main radiating stub 11 and the parasitic stub 12 on the target side frame, it is possible to support the main radiating stub 11 and the parasitic stub 12 having larger dimensions, so that the main radiating stub 11 and the parasitic stub 12 can support the 1 / 2 wavelength mode of the low-frequency band, thereby increasing the radiation efficiency of the antenna device 10. In addition, since the main radiating stub 11 and the parasitic stub 12 extend in the same direction and the resonant currents on the main radiating stub 11 and the parasitic stub 12 are in phase, the ground plane will generate a corresponding longitudinal mode current. Since the longitudinal dimension of the ground plane is larger than its lateral dimension, it is beneficial to improve the radiation efficiency and bandwidth of the antenna device 10, resulting in better communication performance of the electronic device 100.

[0088] Exemplarily, the electronic device 100 is a mobile phone, the length of the mobile phone in the longitudinal direction is greater than the length of the mobile phone in the lateral direction, i.e., the length of the side frame of the mobile phone is greater than the length of the top frame 201 and the length of the bottom frame 203 respectively, and the main radiating branch 11 and the parasitic branch 12 are located in the second side frame 204 respectively, so that the main radiating branch 11 and the parasitic branch 12 can have a relatively large size, for example, the main radiating branch 11 and the parasitic branch 12 can be 50 mm respectively, and the antenna device 10 can excite the mobile phone floor to generate a longitudinal mode current, and since the longitudinal size of the mobile phone is greater than the lateral size, the radiation efficiency of the antenna device 10 is relatively high, the bandwidth is relatively large, and the communication performance of the mobile phone is relatively good.

[0089] In one embodiment, as shown in FIG. 1, the electronic device 100 further includes a mainboard 21 and a battery 22, the mainboard 21 and the battery 22 are arranged along the direction from the top frame 201 to the bottom frame 203, the mainboard 21 is partially overlapped with the main radiating branch 11 in the orthographic projection of the target side frame, and the battery 22 is partially overlapped with the main radiating branch 11 and the parasitic branch 12 respectively in the orthographic projection of the target side frame. Figure 2

[0090] Since the feed 14 needs to be arranged on the mainboard 21, and in the related art, the size of the radiating branch of the low-frequency antenna is relatively small, so it is difficult for the low-frequency antenna to fully utilize the side space of the battery 22 compartment of the electronic device 100 to achieve a relatively high antenna efficiency.

[0091] In the embodiment, by arranging the main radiating branch 11 and the parasitic branch 12, and making the mainboard 21 partially overlapped with the main radiating branch 11 in the orthographic projection of the target side frame, and the battery 22 partially overlapped with the main radiating branch 11 and the parasitic branch 12 respectively in the orthographic projection of the target side frame, the side space of the battery 22 compartment of the electronic device 100 can be fully utilized, and a low-frequency antenna with a relatively large physical size can be arranged in the battery 22 compartment of the electronic device 100. Exemplarily, by this form, the length of the main radiating branch 11 can be greater than 50 mm, even greater than 60 mm, the parasitic branch 12 also uses a new working mode, and the physical length of the parasitic branch 12 can also be greater than 50 mm, so that the physical size of the main radiating branch 11 and the parasitic branch 12 can be greater than 100 mm, and the size of the antenna device 10 is relatively large, the radiation efficiency of the antenna device 10 is relatively high, the bandwidth is relatively large, and the communication performance of the electronic device 100 is relatively good.

[0092] As shown in FIG. 2, further, the electronic device is a mobile phone 50, and specifically, Figure 11 Figure 11 ​​As shown, the mobile phone 50 can include a memory 51 (optionally including one or more computer readable storage media), a processing circuit 52, an input / output (I / O) subsystem 53, and at least one antenna device 54 as described in any of the preceding embodiments. These components optionally communicate over one or more communication buses or signal lines 55. As will be understood by those skilled in the art, the mobile phone 50 can include other components not shown in FIG. 1, such as a power supply, power management system, and / or a housing. Figure 11 The mobile phone 50 shown is not meant to imply architectural limitations to the mobile phone, and that the mobile phone can include more or fewer components than shown, or a different arrangement of the components shown. Figure 11 The various components shown in FIG. 1 can be implemented in hardware, software, or a combination of both hardware and software, including one or more signal processing and / or application specific integrated circuits.

[0093] The memory 51 optionally includes high-speed random access memory and can also include non-volatile memory, such as one or more magnetic disk storage devices, flash memory devices, or other non-volatile solid-state storage devices. Exemplary software stored in the memory 51 includes an operating system 511, a communication module (or set of instructions) 512, a global positioning system (GPS) module (or set of instructions) 513, and / or the like.

[0094] The processing circuit 52 can be used to control the overall operation of the mobile phone 50. The processing circuit 52 can be based on one or more microprocessors, microcontrollers, digital signal processors, baseband processors, power management units, audio codec chips, special-purpose integrated circuits, etc.

[0095] When the electronic device needs to work at a target communication frequency band, the processing circuit 52 can control the on-off state of the tuning circuit to improve the communication performance of the electronic device working at the target communication frequency band. Exemplarily, when the target communication frequency band is a low frequency band, the processing circuit 52 can control the first tuning circuit to be in the off state to provide the first antenna with the communication performance of radiating radio frequency signals of the low frequency band.

[0096] The I / O subsystem 53 couples input / output peripherals on the mobile phone 50, such as the button and other input controls, to peripheral interfaces. The I / O subsystem 53 optionally includes a touch screen, buttons, tone generators, accelerometers (motion sensors), ambient light sensors and other sensors, light emitting diodes and other status indicators, data port, etc. Exemplarily, a user can control the operation of the mobile phone 50 by providing input through a touch screen and other input control devices supplied to the I / O subsystem 53, and can receive status information and other output from the mobile phone 50 using the output resources of the I / O subsystem 53. For example, a user can turn the mobile phone on or off by pressing a button 531.

[0097] In the description of the specification, the description of the terms "some embodiments", "other embodiments", etc. means that the particular feature, structure, material, or characteristic being described is included in at least one embodiment or example of the application. The illustrative descriptions in this specification are not necessarily to be construed as indicating that all embodiments or examples of the application include the described feature, structure, material or characteristic.

[0098] The technical features of the above-described embodiments can be combined in any manner, and for brevity, not all possible combinations of the technical features in the above-described embodiments are described, but it should be considered that any combination of the technical features is within the scope of the present application as long as the combination does not result in a contradiction.

[0099] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the scope of the present application. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, and these are within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. An antenna device, characterized in that, include: The main radiating branch includes a first free end, a feed point, and a second free end; The parasitic branch includes a third free end and a fourth free end, and a coupling gap is provided between the second free end and the third free end; The feed source feeds a power signal to the main radiating stub through the feed point, causing the main radiating stub to couple with the parasitic stub through the coupling gap, thereby exciting the main radiating stub and the parasitic stub to generate 1 / 2 wavelength modes that support the low-frequency band.

2. The antenna device according to claim 1, characterized in that, The portion of the main radiating stub between the feed point and the second free end supports the 1 / 2 wavelength mode; The portion of the parasitic branch between the third and fourth free ends supports the 1 / 2 wavelength mode.

3. The antenna device according to claim 1, characterized in that, The width of the coupling gap is within a preset range to change the boundary conditions for electromagnetic waves to pass through the gap, so that the electric field component in the normal direction of the gap is greater than the electric field component in the tangential direction, where the tangential direction is the direction parallel to the second free end to the third free end.

4. The antenna device according to claim 3, characterized in that, The width of the coupling gap is 0.1mm-0.7mm.

5. The antenna device according to claim 1, characterized in that, The lengths of the main radiating branches and the parasitic branches range from 40 to 60 mm.

6. The antenna device according to claim 1, characterized in that, The length ratio of the main radiating branch to the parasitic branch ranges from 0.8 to 1.

2.

7. The antenna device according to claim 1, characterized in that, The power supply point is located near the first free end.

8. The antenna device according to claim 1, characterized in that, The parasitic branch also includes a grounding point; the antenna device also includes: A tuning circuit is provided, which is connected to both the grounding point and the common ground. The tuning circuit is used to select and conduct the tuning path between the grounding point and the common ground.

9. The antenna device according to claim 8, characterized in that, The grounding point is located near the third free end or the fourth free end.

10. The antenna device according to claim 1, characterized in that, The main radiating branch and the parasitic branch extend in the same direction.

11. The antenna device according to claim 1, characterized in that, The antenna device further includes a floor; wherein the floor includes a first side and a second side connected to the first side, the length of the second side being greater than the length of the first side; The main radiating branch and the parasitic branch extend in the same direction as the second side.

12. The antenna device according to claim 11, characterized in that, While the antenna device excites the main radiating stub and the parasitic stub to generate 1 / 2 wavelength modes supporting the low-frequency band, it also excites the ground to generate a longitudinal mode current, the direction of which is the same as the extension direction of the second side.

13. An electronic device, characterized in that, Includes the antenna device as described in any one of claims 1 to 12.

14. The electronic device according to claim 13, characterized in that, The electronic device includes a middle plate and a conductive frame connected to the edge of the middle plate, wherein the main radiating branch and the parasitic branch are located on the conductive frame.

15. The electronic device according to claim 14, characterized in that, The conductive frame includes a top frame and a bottom frame arranged opposite to each other, and a first side frame and a second side frame arranged opposite to each other. The top frame, the first side frame, the bottom frame and the second side frame are connected end to end in sequence. The main radiating branch and the parasitic branch are respectively located on the target side frame. The target side frame is one of the first side frame and the second side frame.

16. The electronic device according to claim 15, characterized in that, The electronic device further includes a motherboard and a battery, which are arranged along the direction from the top frame to the bottom frame. The orthographic projection of the motherboard on the target side frame overlaps with the main radiating branch portion, and the orthographic projection of the battery on the target side frame overlaps with both the main radiating branch portion and the parasitic branch portion.

Images