CN223809246U - Antenna and electronic equipment - Google Patents
Antenna and electronic equipmentInfo
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- CN223809246U CN223809246U CN202520156689.0U CN202520156689U CN223809246U CN 223809246 U CN223809246 U CN 223809246U CN 202520156689 U CN202520156689 U CN 202520156689U CN 223809246 U CN223809246 U CN 223809246U
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Abstract
本申请提供一种天线及电子设备，涉及天线的技术领域。其中，天线包括：第一天线单元，第一天线单元包括第一辐射体；第二天线单元，第二天线单元包括第二辐射体；微带线，微带线沿长度方向的两端分别连接第一辐射体和第二辐射体，微带线上设有第一馈电端口和第二馈电端口；其中，第一天线单元和第二天线单元沿与长度方向垂直的第二方向的投影至少部分落入第一馈电端口和第二馈电端口之间，第一信号能够在第一馈电端口和第一辐射体之间传输，第二信号能够在第二馈电端口和第二辐射体之间传输，第一信号和第二信号互不干扰。
This application provides an antenna and an electronic device, relating to the technical field of antennas. The antenna includes: a first antenna element, which includes a first radiator; a second antenna element, which includes a second radiator; and a microstrip line, with its two ends along its length connected to the first and second radiators, respectively. The microstrip line has a first feed port and a second feed port. The projections of the first and second antenna elements along a second direction perpendicular to the length direction at least partially fall between the first and second feed ports. A first signal can be transmitted between the first feed port and the first radiator, and a second signal can be transmitted between the second feed port and the second radiator. The first and second signals do not interfere with each other.
Description
Technical Field
The present application relates to the field of antennas, and in particular, to an antenna and an electronic device.
Background
In terms of improving the isolation of antennas, one of the related art is to use decoupling resonators to decouple a plurality of antennas, but the decoupling nodes occupy additional space, and the other is to place the antennas at a remote location, such as the upper left corner and the lower right corner, in the related electronic device, but the isolation cannot meet the requirement.
Disclosure of utility model
The embodiment of the application provides the following technical scheme:
The first aspect of the application provides an antenna, which comprises a first antenna unit, a second antenna unit and a microstrip line, wherein the first antenna unit comprises a first radiator, the second antenna unit comprises a second radiator, the microstrip line is connected with the first radiator and the second radiator respectively at two ends of the microstrip line along the length direction, a first feed port and a second feed port are arranged on the microstrip line, projections of the first antenna unit and the second antenna unit along a second direction perpendicular to the length direction at least partially fall between the first feed port and the second feed port, a first signal can be transmitted between the first feed port and the first radiator, a second signal can be transmitted between the second feed port and the second radiator, and the first signal and the second signal are not interfered with each other.
In some embodiments of the present application, the first radiator and the second radiator are symmetrically arranged, the first radiator, the second radiator and the microstrip line enclose to form a ring, and the first feed port and the second feed port are symmetrically arranged on the microstrip line.
In some embodiments of the application, the antenna further comprises a dielectric substrate, the first antenna unit, the second antenna unit and the microstrip line are arranged on a first surface of the dielectric substrate, a grounding plate is connected to a second surface of the dielectric substrate, which is opposite to the first surface, and one ends of the first radiator and the second radiator, which are far away from the microstrip line, are connected to the grounding plate.
In some embodiments of the present application, the first antenna element and the second antenna element are IFA antennas, and the first antenna element and the second antenna element are symmetrically disposed.
In some embodiments of the present application, the first antenna unit further includes a third radiator, one end of the third radiator is connected to the first radiator, the other end of the third radiator is connected to the ground plate, the second antenna unit further includes a fourth radiator, one end of the fourth radiator is connected to the second radiator, the other end of the fourth radiator is connected to the ground plate, and the third radiator and the fourth radiator are the same radiator.
In some embodiments of the application, the first signal has a first frequency band and the second signal has a second frequency band, the first frequency band being the same as the second frequency band.
In some embodiments of the present application, the first signal is a signal conforming to Bluetooth protocol standard, and the second signal is a signal conforming to WiFi standard.
In some embodiments of the application, the impedance of the microstrip line is 50Ω.
In some embodiments of the application, the antenna further comprises a pair of metal sheets connected to the first and second feed ports, respectively.
The second aspect of the application provides electronic equipment, which comprises an antenna, wherein the antenna comprises a first antenna unit, the first antenna unit comprises a first radiator, a second antenna unit comprises a second radiator, two ends of the microstrip line in the length direction are respectively connected with the first radiator and the second radiator, a first feed port and a second feed port are arranged on the microstrip line, projections of the first antenna unit and the second antenna unit in a second direction perpendicular to the length direction at least partially fall between the first feed port and the second feed port, a first signal can be transmitted between the first feed port and the first radiator, a second signal can be transmitted between the second feed port and the second radiator, the first signal and the second signal do not interfere with each other, a display screen is covered by the shell, a synthetic cavity of the shell and the display screen is arranged in the shell, and the synthetic cavity of the shell is arranged in the shell and is located in the peripheral area of the shell.
Drawings
The above, as well as additional purposes, features, and advantages of exemplary embodiments of the present application will become readily apparent from the following detailed description when read in conjunction with the accompanying drawings. In the drawings, wherein like or corresponding reference numerals indicate like or corresponding parts, there are shown by way of illustration, and not limitation, several embodiments of the application, in which:
Fig. 1 schematically shows a schematic structure of an antenna according to an embodiment of the present application;
FIG. 2 schematically illustrates a schematic diagram of matching and isolation of an antenna according to an embodiment of the present application;
fig. 3 schematically shows a schematic diagram of the radiation efficiency of an antenna according to an embodiment of the application;
Fig. 4 schematically shows a simulation result diagram of the antenna envelope correlation coefficient ECC according to an embodiment of the present application;
fig. 5 schematically shows a pattern of separate feeding of a first feed port in an antenna according to an embodiment of the application;
fig. 6 schematically shows a pattern of separate feeding of a second feed port in an antenna according to an embodiment of the application;
reference numerals illustrate:
1. The antenna comprises a first antenna unit, 101, a first radiator, 102, a third radiator, 2, a second antenna unit, 201, a second radiator, 202, a fourth radiator, 3, a microstrip line, 4, a first feed port, 5, a second feed port and 6, a grounding short-circuit nail.
Detailed Description
Exemplary embodiments of the present application will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the application to those skilled in the art.
It is noted that unless otherwise indicated, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs.
An antenna is a device capable of effectively radiating and receiving electromagnetic waves. When a signal is fed into the antenna, the antenna converts high frequency current energy into electromagnetic waves that radiate into space. When another antenna is within this radiation field, part of the radiation energy is received. This energy will generate an induced current in the receiving antennas, resulting in coupling between the antennas. One way of implementing decoupling between multiple antennas by using decoupling resonators is to use decoupling nodes that occupy additional space, and the other way is to place antennas at remote locations, such as the upper left corner and the lower right corner, in the related electronic device, but the isolation cannot meet the requirement.
Therefore, the microstrip line is arranged between the two antenna units, and can adjust the impedance of the differential mode and the common mode, so that the impedance amplitude of the differential mode and the common mode is equal, and the phase opposition offsets each other, thereby obtaining high isolation between the two feed ports, avoiding the need of inserting various isolation enhancement structures into the two antenna units to enhance isolation, and also avoiding the need of occupying extra space.
Example 1
The embodiment of the application provides an antenna, which is shown in fig. 1, and comprises a first antenna unit 1, a second antenna unit 2 and a microstrip line 3, wherein the first antenna unit 1 comprises a first radiator 101, the second antenna unit 2 comprises a second radiator 201, the microstrip line 3 is respectively connected with the first radiator 101 and the second radiator 201 at two ends of the microstrip line 3 along the length direction, a first feed port 4 and a second feed port 5 are arranged on the microstrip line 3, wherein the projection of the first antenna unit 1 and the second antenna unit 2 along a second direction perpendicular to the length direction at least partially falls between the first feed port 4 and the second feed port 5, a first signal can be transmitted between the first feed port 4 and the first radiator 101, and a second signal can be transmitted between the second feed port 5 and the second radiator 201, and the first signal and the second signal are not interfered with each other.
The antenna comprises a first antenna element 1 and a second antenna element 2, the first antenna element 1 being constituted by a first radiator 101 and the second antenna element 2 being constituted by a second radiator 201. The radiator is a key part of the antenna for signal radiation and reception. The first radiator 101 and the second radiator 201 may be made of metal, and designed by a specific shape (such as inverted F shape, L shape, etc.) to adapt to signal radiation requirements of different frequency bands.
The first antenna element 1 and the second antenna element 2 are connected by a microstrip line 3, and the microstrip line 3 is provided with a first feed port 4 and a second feed port 5. When the antenna is in operation, a first signal fed from the first feed port 4 may be directly transmitted to the first radiator 101 and a second signal fed from the second feed port 5 may be directly transmitted to the second radiator 201.
Since the projected portions of the first antenna element 1 and the second antenna element 2 in the direction perpendicular to the length direction of the microstrip line 3 overlap between the two feed ports, this means that the two antenna elements are closely adjacent to each other in a planar layout, forming a compact structure. However, although they are physically located close, the microstrip line 3 can adjust the impedance of the differential mode and the common mode so that the impedance of the differential mode and the common mode have equal amplitudes and opposite phases to cancel each other, thereby realizing decoupling and enhancing isolation effects and reducing mutual interference between antenna units.
According to the antenna provided by the embodiment of the application, the feed port is arranged in the middle of the microstrip line 3, two ends of the feed port are connected to the antenna unit, and a section of transmission line with a decoupling function is introduced, so that the decoupling enhancement isolation effect can be realized, and the independence of the first signal and the second signal in the transmission process is ensured. Therefore, the antenna can keep compact size, high isolation is achieved, and the overall performance and efficiency of the antenna are improved.
In some embodiments, the first radiator 101 and the second radiator 201 are symmetrically arranged, the first radiator 101, the second radiator 201 and the microstrip line 3 are enclosed to form a ring, and the first feed port 4 and the second feed port 5 are symmetrically arranged on the microstrip line 3.
The first radiator 101 and the second radiator 201 are symmetrical structures, and they may be mirror symmetrical with respect to the central axis or a certain central point of the microstrip line 3. The first radiator 101, the second radiator 201 and the microstrip line 3 enclose a ring structure. The first feed port 4 and the second feed port 5 are symmetrically arranged on the microstrip line 3, i.e. they are located at both ends of the microstrip line 3 or symmetrically with respect to the center point of the loop structure, respectively.
By symmetrically arranging the first radiator 101 and the second radiator 201 and enclosing the microstrip line 3 to form a ring shape, the antenna presents a regular and balanced form in space, which is helpful for the radiation characteristics of the antenna in all directions in space to be more uniform. The symmetrical feed port positions enable the transmission paths of two signals on the microstrip line 3 to have the same electrical characteristics, and signal interference caused by path difference is reduced. Compared with an asymmetric structure, the annular symmetric structure can reduce concentration or attenuation of signals in certain directions and improve uniformity of signal coverage. The annular structure can enable the antenna to realize compact arrangement while maintaining the performance of the antenna, and is suitable for portable equipment and space-limited applications.
In some embodiments, the antenna further comprises a dielectric substrate, the first antenna unit 1, the second antenna unit 2 and the microstrip line 3 are arranged on a first surface of the dielectric substrate, a grounding plate is connected to a second surface of the dielectric substrate, which is opposite to the first surface, and one ends of the first radiator 101 and the second radiator 201, which are far away from the microstrip line 3, are connected to the grounding plate.
A dielectric substrate is used as a bearing foundation for each part of the antenna. The dielectric substrate is used as a bottom layer supporting material, not only can provide mechanical support, but also the dielectric constant and the thickness of the dielectric substrate can be selected to optimize the propagation characteristic of electromagnetic waves, reduce the energy loss in the signal transmission process and improve the overall efficiency of the antenna. The first antenna element 1, the second antenna element 2, and the microstrip line 3 connecting them are all provided on the first surface of the dielectric substrate. For example, in manufacturing an antenna in the form of a Printed Circuit Board (PCB), the first antenna unit 1, the second antenna unit 2, and the microstrip line 3 may be manufactured on a designated surface of a dielectric substrate by photolithography, etching, or the like.
The second surface of the dielectric substrate, which is opposite to the first surface, is connected with the grounding plate. The ground plane is an important component of the antenna structure and provides a reference ground plane for the antenna. The ends of the first radiator 101 and the second radiator 201 remote from the microstrip line 3 are connected to a ground plane, forming a complete antenna structure. The feeding may be achieved by punching holes in the dielectric substrate, and by connecting the coaxial line through the dielectric substrate with the ground plane and with the microstrip line 3. By integrating all components on one dielectric substrate, the assembly process of the antenna is simplified while maintaining a compact form factor.
In some embodiments, the first antenna element 1 and the second antenna element 2 are IFA antennas, and the first antenna element 1 and the second antenna element 2 are symmetrically arranged.
Both the first antenna element 1 and the second antenna element 2 are IFA (Inverted-FAntenna ) antennas. IFA antennas are a common type of planar antenna, typically consisting of a stub, a feed section and a ground section. For the first antenna element 1, the first radiator 101 thereof will be designed as an inverted F-shape, as will the second radiator 201 of the second antenna element 2.
The first antenna element 1 and the second antenna element 2 are arranged on the dielectric substrate in a symmetrical manner, i.e. the two inverted-F-shaped radiators are symmetrically arranged with respect to the centre point of the microstrip line 3, such that the signal path feeding the first antenna element 1 from the first feed port 4 and the signal path feeding the second antenna element 2 from the second feed port 5 have symmetry both in structure and electrically. By symmetrically arranging and using the microstrip line 3 as a feed line, electromagnetic coupling between the two antennas can be effectively reduced. And the IFA antenna has the characteristics of low profile and small volume, and is suitable for application scenes with limited space, such as mobile phones, tablet computers and other portable electronic equipment.
In some embodiments, as shown in fig. 1, the first antenna unit 1 further includes a third radiator 102, one end of the third radiator 102 is connected to the first radiator 101, the other end is connected to a ground plate, the second antenna unit 2 further includes a fourth radiator 202, one end of the fourth radiator 202 is connected to the second radiator 201, the other end is connected to the ground plate, and the third radiator 102 and the fourth radiator 202 are the same radiator.
The first antenna unit 1 and the second antenna unit 2 are both IFA antennas, and the two IFA antennas are symmetrically arranged. The first radiator 101 of the first antenna unit 1 is a feeding portion in the IFA antenna, the third radiator 102 is a grounding portion in the IFA antenna, the second radiator 201 of the second antenna unit 2 is a feeding portion in the IFA antenna, and the fourth radiator 202 is a grounding portion in the IFA antenna. The third radiator 102 and the fourth radiator 202 are overlapped to form the same radiator, which may be a straight metal line, and connect the first radiator 101, the second radiator 201 and the ground plate. The grounded common radiator can be connected with the grounding plate through the grounding short-circuit nail 6, the grounding short-circuit nail 6 is connected with the common radiator and the grounding plate, the input impedance of the antenna can be adjusted, the input impedance of the antenna can be better matched with the impedance of circuits such as a feeder line and the like, and the impedance is closer to 50Ω, so that signal reflection is reduced, signal transmission efficiency is improved, and the radius of the grounding short-circuit nail 6 can be 0.3mm.
Although there is a shared radiator for the first antenna element 1 and the second antenna element 2, electromagnetic coupling between the two antenna elements can be effectively reduced by the symmetrical arrangement and the microstrip line 3. In addition, the shared radiator serves two antenna units as a part of the grounding path, so that the space can be remarkably saved, the miniaturization of the antenna is realized, and the antenna is suitable for portable equipment and other applications with limited space.
In some embodiments, the first signal has a first frequency band and the second signal has a second frequency band, the first frequency band being the same as the second frequency band.
The first antenna element 1 and the second antenna element 2 are inverted-F antennas (IFA) which are symmetrically arranged and connected by a microstrip line 3. The microstrip line 3 is provided with a first feeding port 4 and a second feeding port 5 which are symmetrical and are respectively used for feeding signals in the same frequency band. Because the first antenna unit 1 and the second antenna unit 2 are symmetrically arranged, the first antenna unit 1 and the second antenna unit 2 have the same structure, and can process signals in the same frequency band, but the two antenna units work independently, so that signal transmission is not interfered with each other. For example, the first antenna unit 1 and the second antenna unit 2 are both used for processing a WiFi frequency band of 2.4GHz, or both processing a WiFi frequency band of 5GHz, or respectively processing a WiFi frequency band of 2.4GHz and a bluetooth signal frequency band of 2.4 GHz.
Although the two antenna units are closely adjacent, through the impedance characteristic and decoupling effect of the microstrip line 3, mutual interference between signals in the same frequency band can be obviously reduced, and the signals in each frequency band can be ensured to be independently and clearly transmitted. The antenna has compactness, can reduce the size without sacrificing the performance, and is suitable for small portable electronic equipment.
In some embodiments, the first signal is a signal compliant with Bluetooth protocol standard, and the second signal is a signal compliant with WiFi standard.
The first signal is a signal conforming to Bluetooth standard, and usually the Bluetooth signal works in 2.4GHz frequency band, and has the characteristics of low power consumption and short-distance communication. The Bluetooth device is suitable for being connected with various Bluetooth devices, such as Bluetooth headphones, bluetooth mice, bluetooth keyboards and the like, and realizes data exchange and simple control functions between the devices. The second signal is a signal conforming to the WiFi standard of the wireless fidelity protocol, and can generally work in the 2.4GHz or 5GHz frequency band, so as to provide a higher data transmission rate, and be used for connecting to the internet, transmitting a large amount of data, such as browsing a web page, watching a video, downloading a file, and the like.
The two antenna units are symmetrically arranged and connected through a microstrip line 3, and a first feed port 4 and a second feed port 5 are arranged on the microstrip line 3 and are respectively used for feeding in Bluetooth signals and WiFi signals. Although the two antenna units are closely adjacent, through the impedance characteristic and decoupling effect of the microstrip line 3, mutual interference among signals of different protocols can be obviously reduced, and the signals of each protocol can be ensured to be independently and clearly transmitted. Through integrating bluetooth signal and wiFi signal in an antenna system, the antenna can support bluetooth and wiFi two kinds of agreements simultaneously, need not to be equipped with independent antenna for bluetooth and wiFi respectively, has saved equipment space and cost, has improved the functional diversity and the convenience of equipment.
In some embodiments, the impedance of the microstrip line 3 is 50Ω.
50 Ω is one of the transmission line impedance criteria commonly used in wireless communication systems, and this impedance value is selected to help minimize reflection losses and improve signal transmission efficiency. When the impedances of the source and load terminals are equal, maximum power transfer can theoretically be achieved, reducing energy losses. The decoupling performance of the microstrip line 3 can be improved by precisely controlling the 50 omega impedance, and the mutual interference between different frequency bands or protocols can be further reduced.
In order to ensure that the impedance of the microstrip line 3 is 50Ω, accurate calculation and design can be performed according to factors such as the dielectric constant, thickness, and wire width of the dielectric substrate, and special electromagnetic simulation software (such as HFSS, CST, etc.) can be used to optimize physical parameters of the microstrip line 3. In the antenna provided by the embodiment of the application, based on the dielectric constant of 4.4 and the thickness of 1.6mm of the dielectric substrate, the length of the microstrip line 3 is 14.4mm, the width is 3mm and the distance from the first feed port 4 to the second feed port 5 is 11mm through continuous optimization of electromagnetic simulation software.
In some embodiments the antenna further comprises a pair of metal sheets connected to the first feed port 4 and the second feed port 5, respectively.
The metal sheet may be machined from sheet metal, such as a copper sheet or an aluminum sheet. They are connected to the first and second feed ports 4, 5, respectively, which may be connected to the feed ports by means of soldering, ensuring a good electrical connection. In practice, when feeding is performed using a coaxial cable, the inner conductor of the coaxial cable is connected to this metal sheet structure and the outer conductor is connected to the ground plate below. The metallic sheet structure serves as a feed for the connection point of the inner conductor of the coaxial cable, effectively transmitting signals from the coaxial cable into the antenna system.
The specific dimensions of the metallic sheet structure may be determined based on the operating frequency, bandwidth, and desired electrical performance of the antenna. It may be rectangular, circular or other shape, the shape and size of which may affect the performance index of the antenna, such as input impedance, bandwidth, etc. Simulation and optimization can be performed by electromagnetic simulation software to find the optimal size and shape. Through continuous optimization of electromagnetic simulation software, the metal sheet provided by the embodiment of the application has a square structure with the size of 1mm multiplied by 1 mm.
The antenna provided by the embodiment of the application can realize decoupling by connecting two antenna units through the microstrip line 3, and has a simple structure. As shown in fig. 2, S11 represents the matching degree of the first antenna unit 1, S22 represents the matching degree of the second antenna unit 2, and S21 represents the isolation degree between the two antenna units, so that the isolation degree in the 2.4GHz working frequency band can reach more than 30dB, the effect of the isolation degree of the antenna is obviously improved, the application requirement such as independent bluetooth can be met by the high isolation degree, and the optimized antenna meets the design requirement. As shown in fig. 5 and fig. 6, by arranging the microstrip line 3, the directions of the two feed ports are not coincident, so that the ECC (Envelope Correlation Coefficient ) of the two antenna ports is very low due to the high isolation and the irrelevance of the directional diagram, and as shown in fig. 3, the maximum of only 0.007 in the 2.4GHz working frequency band, so that the optimized antenna meets the design requirement. And as shown in fig. 4, by adopting the antenna structure provided by the embodiment of the application, the radiation frequency of the antenna is close to 90% in the 2.4GHz working frequency band, and the radiation frequency of the antenna is greatly improved. The antenna provided by the embodiment of the application does not need an additional decoupling network and decoupling resonators, and the space layout of the antenna is greatly reduced by sharing one radiator by two antenna units.
Example 2
An embodiment of the present application provides an electronic device, including,
The antenna comprises a first antenna unit 1, a second antenna unit 2 and a microstrip line 3, wherein the first antenna unit 1 comprises a first radiator 101, the second antenna unit 2 comprises a second radiator 201, the microstrip line 3 is respectively connected with the first radiator 101 and the second radiator 201 at two ends of the microstrip line 3 along the length direction, a first feed port 4 and a second feed port 5 are arranged on the microstrip line 3, projections of the first antenna unit 1 and the second antenna unit 2 along a second direction perpendicular to the length direction at least partially fall between the first feed port 4 and the second feed port 5, a first signal can be transmitted between the first feed port 4 and the first radiator 101, and a second signal can be transmitted between the second feed port 5 and the second radiator 201, and the first signal and the second signal are not interfered with each other;
A display screen;
The shell body covers the periphery side of the display screen, the shell body and the display screen enclose a cavity, the antenna is arranged in the cavity and is located in a range where the shell body covers the periphery side of the display screen.
The electronic device is mainly composed of an antenna, a display screen and a shell. As a means for displaying information, a liquid crystal display, an organic light emitting diode display, or the like is generally used, and is placed on the front surface or the main display area of the device. The shell covers the periphery of the display screen and forms a cavity together with the display screen. The housing may be made of plastic, metal or composite material and is primarily intended to provide protection and support for the electronic device. The antenna is used as an important signal receiving and transmitting component, is arranged in the cavity and is positioned in a range that the shell covers the periphery of the display screen, so that the space inside the equipment can be fully utilized, the antenna is prevented from being exposed, and the appearance integrity and the aesthetic property of the equipment are ensured.
When the electronic device works, a first signal input from an external signal source enters the microstrip line 3 through the first feed port 4 and is transmitted to the first radiator 101 to radiate the signal, and a second signal enters the microstrip line 3 through the second feed port 5 and is finally transmitted to the second radiator 201. Since the first antenna element 1 and the second antenna element 2 may be closely adjacent in space, and the mutual noninterference of the first signal and the second signal is ensured by the microstrip line 3. The antenna has the characteristic of compactness and miniaturization, so that the occupied internal space of the electronic equipment can be reduced, and the antenna can be well adapted to the requirements of modern electronic equipment on miniaturization.
The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
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| CN202520156689.0U CN223809246U (en) | 2025-01-23 | 2025-01-23 | Antenna and electronic equipment |
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| CN202520156689.0U CN223809246U (en) | 2025-01-23 | 2025-01-23 | Antenna and electronic equipment |
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| CN223809246U true CN223809246U (en) | 2026-01-16 |
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