Circularly polarized antenna

Abstract

The application provides a circularly polarized antenna. The circularly polarized antenna comprises a circular grounding plate, a circular dielectric substrate, a feed network, a plurality of L-shaped coupling units and a circular radiation sheet. A first surface of the dielectric substrate is arranged in abutment with a surface of the grounding plate, and the feed network is arranged on a second surface of the dielectric substrate. One end of each of the plurality of L-shaped coupling units is connected with the feed network, and the other end of each of the plurality of L-shaped coupling units is connected with the radiation sheet. The circularly polarized antenna can ensure good circular polarization characteristics, compatibility with multiple frequency ranges, miniaturization of the circularly polarized antenna, and improvement of the communication quality of a mobile terminal.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of antennas, in particular to a circularly polarized antenna. BACKGROUND

[0002] With the development of wireless communication technology, especially in non-terrestrial network (NTN) communication, an antenna is usually used as a key component for signal transmission and reception. In order to ensure the communication quality of a mobile terminal, the performance of the antenna needs to be optimized, for example, the working frequency range of the antenna.

[0003] In the related art, a circularly polarized antenna is generally used for signal transmission and reception. In actual application, the circularly polarized antenna can generate two signals with equal amplitude and a phase difference of 90 degrees to excite a circularly polarized wave, and perform signal transmission and reception based on the circularly polarized wave.

[0004] However, in the above process, due to the small internal space of the mobile terminal, the circularly polarized antenna will be limited in its working frequency range when its size is reduced, that is, it can only work in a single frequency band or a few fixed frequency bands, which is difficult to meet the actual communication demand. In this case, how to design a circularly polarized antenna that can simultaneously support multiple frequency bands in the limited space of the mobile terminal is a problem to be solved. SUMMARY

[0005] The present application provides a circularly polarized antenna to solve the problem of poor communication quality.

[0006] In a first aspect, the present application provides a circularly polarized antenna, comprising: a circular ground plate, a circular dielectric substrate, a feed network, a plurality of L-shaped coupling units, and a circular radiation patch, wherein,

[0007] The first surface of the dielectric substrate is arranged in close contact with one surface of the ground plate, and the feed network is arranged on the second surface of the dielectric substrate.

[0008] One end of the plurality of L-shaped coupling units is connected to the feed network, and the other end of the plurality of L-shaped coupling units is connected to the radiation patch.

[0009] In a possible implementation, the L-shaped coupling unit comprises a metal column and a metal sheet, wherein,

[0010] One end of the metal column is connected to the feed network;

[0011] The other end of the metal column is connected to one end of one surface of the metal sheet;

[0012] In a possible implementation, the plurality of L-shaped coupling units comprises a first L-shaped coupling unit, a second L-shaped coupling unit, a third L-shaped coupling unit, and a fourth L-shaped coupling unit, wherein,

[0013] The four metal columns of the four L-shaped coupling units are connected with four connection points in the feeding network, and the four connection points form a square;

[0014] The metal sheet in the first L-shaped coupling unit is arranged opposite to the metal sheet in the third L-shaped coupling unit;

[0015] The metal sheet in the second L-shaped coupling unit is arranged opposite to the metal sheet in the fourth L-shaped coupling unit.

[0016] In a possible implementation, the antenna further comprises a switching switch, and the feeding network comprises at least two feeding units, wherein,

[0017] The switching switch is configured to electrically connect the plurality of L-shaped coupling units with a selected one of the at least two feeding units.

[0018] In a possible implementation, the number of L-shaped coupling units is four, and the feeding unit comprises four connection points, wherein,

[0019] One end of the switching switch is connected with one end of the four metal columns of the four L-shaped coupling units;

[0020] The other end of the switching switch is configured to be connected with the four connection points of the selected one of the at least two feeding units, so as to connect the plurality of L-shaped coupling units with the one feeding unit.

[0021] In a possible implementation, the number of L-shaped coupling units is four, and the feeding unit comprises four connection points, wherein,

[0022] The switching switch is configured to rotate the four L-shaped coupling units, so as to connect the four metal columns of the four L-shaped coupling units with the four connection points of the selected one of the at least two feeding units.

[0023] In a possible implementation, the number of L-shaped coupling units is four, and the feeding network is configured to generate, at the electrical connections with the four L-shaped coupling units, electrical signals with equal amplitudes and phase lags of 90 degrees in sequence.

[0024] In a possible implementation, the feeding network comprises at least one of a microstrip line, a waveguide, a strip line, a chip device, or a radio frequency matching network circuit.

[0025] In a possible implementation, the material of the dielectric substrate is epoxy resin.

[0026] In a possible implementation, the antenna is a non-terrestrial network (NTN) antenna.

[0027] In a possible implementation, the antenna is a circularly polarized antenna.

[0028] In a second aspect, an electronic device is provided, including: at least one processor; and a circularly polarized antenna as described in the first aspect and any one of the first aspect.

[0029] The circularly polarized antenna provided by the embodiments of the present application includes a circular ground plate, a circular dielectric substrate, a feed network, a plurality of L-shaped coupling units, and a circular radiation sheet. By connecting the plurality of L-shaped coupling units with the feed network, a plurality of electrical signals with equal amplitudes and a phase difference of 90 degrees can be generated, thereby achieving good circular polarization characteristics. Further, by using the feed network, the circularly polarized antenna can work in multiple frequency ranges, i.e., can be compatible with multiple frequency ranges at the same time, and the structure of the circularly polarized antenna is compact, and can be applied to mobile terminals. Therefore, the circularly polarized antenna provided by the embodiments of the present application can ensure good circular polarization characteristics, compatibility with multiple frequency ranges, and miniaturization of the circularly polarized antenna at the same time, thereby improving the communication quality of the mobile terminal. BRIEF DESCRIPTION OF DRAWINGS

[0030] The accompanying drawings, which are incorporated herein and form part of the specification, illustrate embodiments consistent with the present application and, together with the description, further serve to explain the principles of the application.

[0031] FIG. 1A A side view of a circularly polarized antenna provided by the embodiments of the present application;

[0032] FIG. 1B A top view of the circularly polarized antenna of FIG. 1A

[0033] FIG. 1C A structure schematic diagram of another circularly polarized antenna provided by the embodiments of the present application;

[0034] FIG. 2A A structure schematic diagram of a feed network provided by the embodiments of the present application;

[0035] FIG. 2B Another structure schematic diagram of a feed network provided by the embodiments of the present application;

[0036] FIG. 3A A structure schematic diagram of an L-shaped coupling unit, a mechanical switch, and a feed network 3 provided by the embodiments of the present application;

[0037] FIG. 3B ​A structure schematic diagram of an L-shaped coupling unit, an electronic switch and a feed network provided by an embodiment of the present application is provided.

[0038] FIG. 4A An S11 simulation schematic diagram of a circularly polarized antenna in an N256 frequency band provided by an embodiment of the present application is provided.

[0039] FIG. 4B An S11 simulation schematic diagram of a circularly polarized antenna in a satellite network frequency band provided by an embodiment of the present application is provided.

[0040] FIG. 4C An axial ratio simulation schematic diagram of a circularly polarized antenna in an N256 frequency band provided by an embodiment of the present application is provided.

[0041] FIG. 4D An axial ratio simulation schematic diagram of a circularly polarized antenna in a satellite network frequency band provided by an embodiment of the present application is provided.

[0042] FIG. 5 A position schematic diagram of a circularly polarized antenna and a mobile terminal provided by an embodiment of the present application is provided.

[0043] Legend of reference signs:

[0044] 1-ground plate

[0045] 2-medium substrate

[0046] 3-feed network

[0047] 3a-first feed unit

[0048] 3b-second feed unit

[0049] 4-L-shaped coupling unit

[0050] 4a-metal column

[0051] 4b-metal sheet

[0052] 5-radiation sheet

[0053] 6-switching switch

[0054] Through the above figures, the specific embodiments of the present application have been shown, and more detailed descriptions will be given hereinafter. These figures and textual descriptions are not intended to limit the scope of the concept of the present application by any means, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0055] The exemplary embodiments will be described in detail herein with reference to the attached drawings. In the following description, like reference numerals refer to like elements, unless indicated otherwise. The following description of exemplary embodiments is not representative of all possible embodiments consistent with the present application. Instead, it is merely an example of apparatus and methods consistent with some aspects of the present application as detailed in the appended claims.

[0056] It should be noted that in the embodiments of the present application, some software, components, models and the like in the industry may be mentioned, which should be considered as exemplary, and the purpose is only to illustrate the feasibility of the implementation of the technical solutions of the present application, but it does not mean that the applicant has or will necessarily use the scheme.

[0057] Next, the circularly polarized antenna shown in the present application will be described in detail through specific embodiments. It should be noted that the following embodiments can exist independently or can be combined with each other. For the same or similar content, it will not be described repeatedly in different embodiments.

[0058] Next, some terms in the embodiments of the present application are explained and described to facilitate understanding by those skilled in the art.

[0059] Non-terrestrial network (NTN): a terminal-satellite direct communication technology, which is also an important supplement to ground cellular communication technology. Through the integration of satellite communication network and ground 5G network, NTN can provide ubiquitous coverage without being limited by topography, and connect space such as sky, earth and sea to form an integrated ubiquitous access network, and realize on-demand access in all scenarios.

[0060] Antenna S11 parameter: usually represents the reflection coefficient of the antenna, that is, the ratio of the signal power reflected back to the antenna port to the antenna port transmission power. The ratio reflects the antenna radiation efficiency. The smaller the reflected signal, the more signal is radiated through the antenna to the space, and the higher the antenna radiation efficiency; the larger the reflected signal, the less signal is radiated through the antenna to the space, and the lower the antenna radiation efficiency.

[0061] Axial ratio: is a key parameter for measuring the circular polarization characteristics of an antenna, representing the ideal degree of circular polarization. The bandwidth of the axial ratio not greater than 3dB is defined as the circular polarization bandwidth of the antenna, and the circularly polarized antenna with axial ratio less than 3dB can achieve good circular polarization characteristics.

[0062] For ease of understanding, the following will be described in conjunction with FIGS. 1A-1B The structure of a circularly polarized antenna provided in the embodiments of the present application is described.

[0063] FIG. 1AA side view of a circularly polarized antenna according to an embodiment of the present application. FIG. 1B A top view of the circularly polarized antenna according to an embodiment of the present application. FIG. 1A A top view of the circularly polarized antenna according to an embodiment of the present application.

[0064] Referring to FIG. 1A and FIG. 1B The circularly polarized antenna according to an embodiment of the present application includes a circular grounding plate 1, a circular dielectric substrate 2, a feed network 3, a plurality of L-shaped coupling units 4, and a circular radiation patch 5.

[0065] The first surface of the dielectric substrate 2 is arranged in abutment with one surface of the grounding plate 1, and the feed network 3 is arranged on a second surface of the dielectric substrate 2. One end of each of the plurality of L-shaped coupling units 4 is connected to the feed network 3, and the other end of each of the plurality of L-shaped coupling units 4 is connected to the radiation patch 5.

[0066] Abutment refers to electrical connection between different components in a certain fixed manner. For example, the fixed manner can be welding, bonding, etc. In actual application, the electrical connection can be achieved by surface mount technology (SMT).

[0067] The grounding plate 1 is circular in shape and has a diameter of 48 mm. The grounding plate 1 is arranged in parallel with the dielectric substrate 2, and one surface of the grounding plate 1 is electrically connected to the first surface of the dielectric substrate 2.

[0068] The dielectric substrate 2 has a supporting and fixing function and can be used to fix the feed network 3 and the grounding plate 1. The feed network 3 can be electrically connected to the dielectric substrate 2 in a fixed or detachable manner.

[0069] In the embodiment of the present application, the material of the dielectric substrate 2 is epoxy resin, and the shape of the dielectric substrate is circular with a diameter less than or equal to that of the grounding plate 1. The thickness of the dielectric substrate 2 is 0.8 mm.

[0070] The feed network 3 includes at least two feed units. Each feed unit can work in different resonant modes, and different resonant modes correspond to different frequency coverage ranges, i.e., the feed network 3 can be compatible with multiple operating frequency bands.

[0071] Specifically, in the embodiment of the present application, the feed network 3 can include but is not limited to a plurality of feed units such as a first feed unit 3a and a second feed unit 3b. The operating frequency band of the first feed unit 3a is N256 frequency band (1980-2200 MHz), and the operating frequency band of the second feed unit 3b is Star Network frequency band (3440-3660 MHz). The operating frequency bands of other feed units can be NTN / WIFI 2.4G / WIFI 5G / FDD / TDD / N77 / N78 / N79, etc.

[0072] The power divider is configured to equally divide the received electrical signal into two or more electrical signals with equal amplitude and same phase.

[0073] The phase shifter is configured to adjust the phase of each of the two or more electrical signals, so that the phases of the two or more electrical signals are sequentially different by 90 degrees. For example, assuming that the power divider equally divides the received electrical signal into two electrical signals with equal amplitude and same phase, i.e., electrical signal 1 and electrical signal 2, the phase shifter can sequentially adjust the phases of the two electrical signals with equal amplitude and same phase to corresponding phases, i.e., the phase of the electrical signal 1 is adjusted to 270 degrees, and the phase of the electrical signal 2 is adjusted to 180 degrees, where the phase difference between the electrical signal 1 and the electrical signal 2 is 90 degrees.

[0074] In actual application, the number of the L-shaped coupling units 4 is four, and the feeding network 3 is configured to generate electrical signals with equal amplitude and sequentially lagging by 90 degrees in phase at the electrical connections with the four L-shaped coupling units.

[0075] For example, assuming that the feeding network 3 generates electrical signals at the electrical connections with the four L-shaped coupling units, i.e., electrical signal 1, electrical signal 2, electrical signal 3 and electrical signal 4, the phase relationship between the above-mentioned electrical signals can be as shown in Table 1:

[0076] Table 1

[0077]

[0078] Referring to Table 1, through the coupling effect between the L-shaped coupling units 4 and the feeding network 3, the phases of the electrical signal 1, the electrical signal 2, the electrical signal 3 and the electrical signal 4 can be 0 degrees, 90 degrees, 180 degrees and 270 degrees respectively, and the phase difference between adjacent electrical signals is 90 degrees.

[0079] The radiating sheet 5 can be formed of metal or other conductive material, and is capable of radiating received electrical signals to the outside space in the form of electromagnetic waves, or receiving electromagnetic waves from the outside space.

[0080] In the embodiment, the radiating sheet 5 and the dielectric substrate 2 are separated by air, the radiating sheet 5 does not contact the plurality of L-shaped coupling units 4, and the radiating sheet 5 is parallel to the plane direction of the dielectric substrate 2. The shape of the radiating sheet 5 is circular, the diameter of the radiating sheet 5 is smaller than the diameter of the dielectric substrate 2, and the vertical distance between the radiating sheet 5 and the ground plate 1 is 12 mm. It should be noted that the specific shape and size of the radiating sheet 5 can be set according to the use scene of the antenna or actual needs, which is not limited here.

[0081] The size of the antenna can be determined according to the size of the ground plate 1 and the vertical distance between the ground plate 1 and the radiating sheet 5. In the embodiment of the present application, the diameter of the ground plate 1 is 48 mm, and the vertical distance between the ground plate 1 and the radiating sheet 5 is 12 mm, so the size of the circularly polarized antenna is 48 mm*48 mm*12 mm.

[0082] Next, the receiving and transmitting processes of the circularly polarized antenna are described.

[0083] When the circularly polarized antenna is a receiving antenna, the electromagnetic wave signal in space is first received by the radiating sheet 5 of the antenna, which converts the electromagnetic wave signal into an electric signal and couples the electric signal to the plurality of L-shaped coupling units 4. Then, the L-shaped coupling units 4 transmit the electric signal to the feed network 3, which performs preliminary processing on the signal and then transmits it to the feed component of the mobile terminal for subsequent signal processing and communication, thereby completing the signal receiving process.

[0084] When the circularly polarized antenna is a transmitting antenna, the signal transmitted by the mobile terminal is received by the feed network 3 (for example, the first feed unit 3a) in the circularly polarized antenna. The feed network adjusts the phase and amplitude to distribute the signal to each L-shaped coupling unit in an appropriate manner. Then, the L-shaped coupling unit couples the electric signal to the radiating sheet 5, which converts the electric signal into an electromagnetic wave signal and radiates the signal in the form of an electromagnetic wave into space, thereby completing the signal transmitting process.

[0085] The circularly polarized antenna provided by the embodiment of the present application includes a circular ground plate, a circular dielectric substrate, a feed network, a plurality of L-shaped coupling units, and a circular radiating sheet. By connecting the plurality of L-shaped coupling units with the feed network, a plurality of electric signals with equal amplitudes and a phase difference of 90 degrees can be generated, achieving good circular polarization characteristics. Furthermore, the feed network allows the circularly polarized antenna to work in multiple frequency ranges, i.e., to be compatible with multiple frequency ranges at the same time, and the structure of the circularly polarized antenna is compact, which can be applied to mobile terminals. Therefore, the circularly polarized antenna provided by the embodiment of the present application can ensure good circular polarization characteristics, compatibility with multiple frequency ranges, and miniaturization of the circularly polarized antenna, thereby improving the communication quality of the mobile terminal.

[0086] On the basis of FIGS. 1A-1B , the structure of the circularly polarized antenna is further described below in combination with FIG. 1C .

[0087] FIG. 1C The structure of another circularly polarized antenna provided by the embodiment of the present application is shown in the figure. It should be noted that, in order to clearly show the connection inside the circularly polarized antenna, FIG. 1CThe L-shaped coupling unit 4 and the feed network 3 are drawn in a perspective dotted line frame.

[0088] Please refer to FIG. 1C The L-shaped coupling unit 4 includes a metal column 4a and a metal sheet 4b, wherein one end of the metal column 4a is connected with the feed network 3; the other end of the metal column 4a is connected with one end of one side of the metal sheet 4b.

[0089] The other end of the metal column 4a is perpendicular to the metal sheet 4b, and the end of the metal column 4a away from the metal sheet 4b is perpendicular to the feed network 3.

[0090] The metal sheet 4b is in the shape of a rectangle, and its size is much smaller than that of the radiation sheet 5, and is parallel to the plane direction in which the dielectric substrate 2 is located. In actual application, the metal sheet 4b and the metal column 4a need to be set according to the central direction of the radiation sheet 5, that is, the end of the metal sheet 4b away from the metal column 4a is directed towards the central direction of the radiation sheet 5.

[0091] The plurality of L-shaped coupling units 4 includes a first L-shaped coupling unit, a second L-shaped coupling unit, a third L-shaped coupling unit and a fourth L-shaped coupling unit, wherein the four metal columns in the four L-shaped coupling units are connected with four connection points in the feed network, and the four connection points form a square; the metal sheet in the first L-shaped coupling unit is arranged opposite to the metal sheet in the third L-shaped coupling unit; the metal sheet in the second L-shaped coupling unit is arranged opposite to the metal sheet in the fourth L-shaped coupling unit.

[0092] Please refer to FIG. 1C The circularly polarized antenna further includes a switching switch 6, wherein the switching switch 6 is used to electrically connect the plurality of L-shaped coupling units with a selected one of the at least two feed units.

[0093] In actual application, the circularly polarized antenna can be an array element antenna of an antenna array, that is, the antenna array includes a certain number of circularly polarized antennas (array element antennas), and the plurality of circularly polarized antennas form the antenna array in a certain arrangement manner. In the embodiment of the present application, the number of circularly polarized antennas in the antenna array is not further limited.

[0094] Next, the feed network 3 of the circularly polarized antenna will be described by specific examples in combination with FIG. 2A and FIG. 2B

[0095] FIG. 2A A structural schematic diagram of the feed network provided in the embodiment of the present application, FIG. 2B Another structural schematic diagram of the feed network provided in the embodiment of the present application, assuming that the feed network 3 includes two feed units, namely a first feed unit 3a and a second feed unit 3b. ​

[0096] Please refer to FIG. 2A , the first feeding unit 3a and the second feeding unit 3b are arranged in parallel.

[0097] Please refer to FIG. 2B , the first feeding unit 3a and the second feeding unit 3b have a preset angle, for example, the preset angle can be 10 degrees.

[0098] Optionally, the feeding network 3 includes at least one of the following: a microstrip line, a waveguide, a strip line, a chip device, or a radio frequency matching network circuit, and it should be noted that the present application does not make any limitation on this.

[0099] The circularly polarized antenna provided in the present application includes four L-shaped coupling units, each of which includes a metal column and a metal sheet, and further includes a switching switch. Through the mutual coupling of the four L-shaped coupling units and the four connection points of the feeding units in the feeding network, four electrical signals with equal amplitudes and phase lags of 90 degrees can be generated, which can achieve good circular polarization characteristics. Further, the electrical connection of the L-shaped coupling units and different feeding units can be controlled by the switching switch to switch different frequency ranges under different conditions. Therefore, the circularly polarized antenna of the present application has good circular polarization characteristics, and can simultaneously support multiple frequency ranges, realizes the frequency adjustment of the antenna, and improves the versatility of the antenna.

[0100] Next, the feeding network 3, the L-shaped coupling unit 4, and the switching switch 6 in the circularly polarized antenna will be described in detail in combination with FIG. 3A and FIG. 3B .

[0101] In the present application, the number of L-shaped coupling units is 4, and the feeding unit includes four connection points. One end of the switching switch is connected to one end of the four metal columns of the four L-shaped coupling units; the other end of the switching switch is used to connect to the four connection points of the selected one of the at least two feeding units, so as to connect the multiple L-shaped coupling units to one feeding unit.

[0102] FIG. 3A The structure diagram of the L-shaped coupling unit, the mechanical switch and the feeding network provided in the present application is shown in FIG. 3A. It is assumed that the feeding network 3 includes a first feeding unit 3a and a second feeding unit 3b, the first feeding unit 3a has four connection points, which are m, n, u and v, respectively, and the second feeding unit 3b has four connection points, which are p, q, r and s, respectively.

[0103] Specifically, when the selected feeding unit is the first feeding unit 3a, the switch 6 needs to be connected with the four connection points of m, n, u and v respectively; when the selected feeding unit is the second feeding unit 3b, the switch 6 needs to be connected with the four connection points of p, q, r and s respectively.

[0104] In the case that the switch 6 is a mechanical switch, the electrical connection can be achieved by the following way: the plurality of L-shaped coupling units 4 are arranged in a non-metallic medium, and a mechanical switch (for example, an angle-adjustable knob or the like) is arranged on the non-metallic medium. After determining the selected feeding unit, the mechanical switch is adjusted to rotate the plurality of L-shaped coupling units 4 to a specific angle, and the plurality of L-shaped coupling units 4 are electrically connected with the selected feeding unit.

[0105] It should be noted that the specific shape, size and position of the non-metallic medium and the mechanical switch can be set according to the use scenario of the antenna or actual needs, which are not limited here.

[0106] Optionally, the switch 6 can be a mechanical switch or an electronic switch. The switch is used to rotate the four L-shaped coupling units to connect the four metal columns in the four L-shaped coupling units with the four connection points of the selected one of the at least two feeding units.

[0107] FIG. 3B The structure schematic diagram of the L-shaped coupling unit, the electronic switch and the feeding network provided by the embodiment of the present application is provided, assuming that the feeding network 3 includes the first feeding unit 3a and the second feeding unit 3b, please refer to 3B, in the case that the switch 6 is an electronic switch, the electrical connection can be achieved by the following way: an electronic switch is arranged at the electrical connection of the plurality of L-shaped coupling units 4 close to the four connection points of the feeding network 3, that is, switch 1 (corresponding to the first L-shaped coupling unit), switch 2 (corresponding to the second L-shaped coupling unit), switch 3 (corresponding to the third L-shaped coupling unit) and switch 4 (corresponding to the fourth L-shaped coupling unit).

[0108] After determining the selected feeding unit, the switch states of the switches 1 to 4 are controlled to switch from the open state to the closed state, so that the plurality of L-shaped coupling units 4 and the four connection points of the selected feeding unit are electrically connected.

[0109] The circularly polarized antenna provided in the embodiments of the present application controls the connection of the four L-shaped coupling units and different feed units through a switching switch, wherein the switching switch can be a mechanical switch or an electronic switch. Specifically, the mechanical switch can be used to control the entire L-shaped coupling unit, or an electronic switch can be arranged at the connection between the four connection points of the feed unit and the L-shaped coupling unit. In this way, the circularly polarized antenna can switch different feed units and corresponding frequency ranges (for example, N256 frequency range, etc.) through the switching switch under different conditions, so that the circularly polarized antenna can be compatible with multiple frequency ranges at the same time, realize the adjustment of multiple frequency ranges, and improve the versatility of the antenna.

[0110] On the basis of any one of the above embodiments, the following will be described in combination with FIGS. 4A-4D The S11 parameter and axial ratio of the circularly polarized antenna are described in detail.

[0111] Optionally, it is assumed that the feed network 3 includes two feed units, namely a first feed unit 3a and a second feed unit 3b, wherein the working frequency range of the first feed unit 3a is the N256 frequency range, and the working frequency range of the second feed unit 3b is the satellite network frequency range. Different feed units can be switched through the switching switch 6 to adjust the corresponding working frequency range.

[0112] FIG. 4A The S11 simulation diagram of the circularly polarized antenna provided in the embodiments of the present application in the N256 frequency range is shown in FIG. 4A wherein the abscissa represents the working frequency, and the ordinate represents the S11 value of the antenna. In general, the S11 value in the antenna is required to be less than -10 dB. When the switching switch 6 is switched to the first feed unit 3a, the S11 value of the antenna in the working frequency range (1980 MHz-2200 MHz) is less than -10 dB, and the antenna has good radiation performance.

[0113] FIG. 4B The S11 simulation diagram of the circularly polarized antenna provided in the embodiments of the present application in the satellite network frequency range is shown in FIG. 4B wherein the abscissa represents the working frequency, and the ordinate represents the S11 value of the antenna. When the switching switch 6 is switched to the second feed unit 3b, the S11 value of the antenna in the working frequency range (3440 MHz-3660 MHz) is less than -10 dB, and the antenna has good radiation performance.

[0114] It should be noted that the S11 parameter is usually negative. The smaller the S11 parameter, the lower the antenna return loss, the less energy reflected back by the antenna itself, which means more energy actually enters the antenna, and the higher the antenna system efficiency. Conversely, the larger the S11 parameter, the greater the antenna return loss, and the lower the antenna system efficiency. Generally, an S11 value of -10dB is used as a standard. When the antenna's S11 value is less than -10dB, the antenna can be considered to be working normally, or its transmission and reception efficiency can be considered to be good. Therefore, the circularly polarized antenna structure provided in this embodiment has good transmission and reception efficiency.

[0115] FIG. 4C This is a simulation diagram of the axial ratio of the circularly polarized antenna provided in the N256 frequency band, as shown in the embodiment of this application. Please refer to... FIG. 4C The horizontal axis represents the operating frequency, and the vertical axis represents the axial ratio of the antenna. When the switch 6 is switched to the first feed unit 3a, the axial ratio of the antenna is less than 3dB in the operating frequency band (1980MHz~2200MHz), which can achieve circular polarization characteristics well.

[0116] FIG. 4D This is a simulation diagram of the axial ratio of the circularly polarized antenna provided in the embodiment of this application in the satellite network band. Please refer to... FIG. 4D The horizontal axis represents the operating frequency, and the vertical axis represents the axial ratio of the antenna. When the switch 6 is switched to the second feed unit 3b, the axial ratio of the antenna is less than 3dB in the operating frequency band (3440MHz~3660MHz), which can achieve circular polarization characteristics well.

[0117] It should be noted that the above is only a simulation diagram illustrating the S11 parameters and axial ratio of the antenna as an example, and is not a limitation on the operating frequency band of the antenna.

[0118] Specifically, by setting and adjusting other feed units, the antenna's operating frequency band (NTN / WIFI2.4G / WIFI5G / FDD / TDD / N77 / N78 / N79) can be switched, and the corresponding S11 parameters and axial ratio can be obtained in different frequency bands. It can be seen that the S11 value of the antenna is less than -10dB in different operating frequency bands, and the axial ratio is less than 3dB. That is, the circularly polarized antenna is applicable to multiple frequency bands and can complete signal transmission and reception well.

[0119] from FIGS. 4A-4B It can be seen that the circularly polarized antenna provided in this application embodiment has good circular polarization characteristics and radiation performance.

[0120] FIG. 5 This is a schematic diagram showing the positions of the circularly polarized antenna and the mobile terminal provided in an embodiment of this application, as shown below. FIG. 5 As shown,

[0121] The circularly polarized antenna of the embodiment of the present application can be arranged and applied in a mobile terminal, and the antenna can be installed at a position on the top or middle part of the mobile terminal. The other side of the ground plate 1 can be electrically connected with a grounding component of the mobile terminal, and the end of the feeding unit away from the L-shaped coupling unit 4 can be electrically connected with a feeding component of the mobile terminal, so as to realize signal transmission and reception.

[0122] The mobile terminal can include but is not limited to a mobile phone, a tablet computer, a notebook computer, an electronic book, a router, a wearable device (for example, a watch, a bracelet, a smart helmet, etc.), a vehicle-mounted unit, a smart home device (a rice cooker, a sound box, a home butler device, etc.), an augmented reality (AR) device, a virtual reality (VR) device, and various single-board modules, etc.

[0123] Taking the mobile terminal as a mobile phone as an example, it is assumed that in the circularly polarized antenna, the feeding network 3 includes at least two feeding units, which are a first feeding unit 3a and a second feeding unit 3b, etc., and the feeding units are electrically connected with a grounding component of the mobile phone through the ground plate 1, and are electrically connected with a feeding component of the mobile phone through one of the feeding units in the feeding network 3, so as to realize signal transmission and reception.

[0124] The circularly polarized antenna provided by the embodiment of the present application has good circular polarization characteristics and high radiation performance, and can realize adjustment of multiple frequency ranges in the limited space of the mobile terminal, i.e., in a lower height and smaller size. The circularly polarized antenna not only improves the universality of the circularly polarized antenna, but also ensures the miniaturization of the circularly polarized antenna, so that the mobile terminal can maintain stable signal transmission and reception in various application scenarios, and the communication quality of the mobile terminal is improved.

[0125] The electronic device provided by the embodiment of the present application can be the mobile terminal of the above-mentioned embodiment.

[0126] In several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of the modules is only a logical function division, and actual implementation can have another division manner, for example, a plurality of modules can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the displayed or discussed ones can be indirect coupling or communication connection through some interfaces, devices or modules, and can be electrical, mechanical or other forms.

[0127] The modules described as separate components may or may not be physically separate, and the components displayed as modules may or may not be physical units, i.e., may be located in one place, or may be distributed to multiple network units. Part or all of the modules can be selected to implement the embodiments according to actual needs.

[0128] It should be understood that the above processor can be a central processing unit (CPU), and can also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), etc. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc. The steps of the method disclosed in combination with the application can be directly embodied as hardware processor execution, or executed by a combination of hardware and software modules in the processor.

[0129] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A circularly polarized antenna, characterized by, The circular ground plate, the circular dielectric substrate, the feed network, the plurality of L-shaped coupling units, the switching switch and the circular radiation sheet, the feed network comprises at least two feed units, each feed unit works in different resonant modes, and different resonant modes correspond to different frequency coverage ranges, wherein, The first surface of the dielectric substrate is arranged in close contact with one surface of the ground plate, and the feed network is arranged on the second surface of the dielectric substrate. One end of the plurality of L-shaped coupling units is connected with the feed network, and the other end of the plurality of L-shaped coupling units is connected with the radiation sheet. The switching switch is used to electrically connect the plurality of L-shaped coupling units with a selected one of the at least two feed units. The number of L-shaped coupling units is 4, the feed unit includes 4 connection points, one end of the switching switch is connected with one end of 4 metal columns of 4 L-shaped coupling units, and the other end of the switching switch is used to connect with 4 connection points of a selected one of the at least two feed units, so as to connect the plurality of L-shaped coupling units with the one feed unit.

2. The antenna according to claim 1, characterized in that, The L-shaped coupling unit comprises a metal column and a metal sheet, wherein, One end of the metal column is connected with the feed network; The other end of the metal column is connected with one end of one surface of the metal sheet.

3. The antenna of claim 2, wherein, The plurality of L-shaped coupling units comprises a first L-shaped coupling unit, a second L-shaped coupling unit, a third L-shaped coupling unit and a fourth L-shaped coupling unit, wherein, Four metal columns in the four L-shaped coupling units are connected with 4 connection points in the feed network, and the 4 connection points form a square; The metal sheet in the first L-shaped coupling unit is arranged opposite to the metal sheet in the third L-shaped coupling unit; The metal sheet in the second L-shaped coupling unit is arranged opposite to the metal sheet in the fourth L-shaped coupling unit.

4. The antenna according to claim 1, wherein, The number of L-shaped coupling units is 4, and the feed unit includes 4 connection points, wherein, The switching switch is used to drive the 4 L-shaped coupling units to rotate, so as to connect 4 metal columns in the 4 L-shaped coupling units with 4 connection points of a selected one of the at least two feed units.

5. The antenna according to any one of claims 1-4, characterized in that, The number of L-shaped coupling units is 4, and the feed network is used to generate electrical signals with equal amplitudes and 90-degree phase lags in sequence at the electrical connection positions of the 4 L-shaped coupling units.

6. The antenna according to any one of claims 1-4, wherein, The feed network comprises at least one of the following: a microstrip line, a waveguide, a strip line, a chip device, or a radio frequency matching network circuit.

7. The antenna according to any one of claims 1-4, wherein, The material of the dielectric substrate is epoxy resin.

8. The antenna according to any one of claims 1-4, wherein, The antenna is a non-terrestrial network (NTN) antenna.

9. An antenna array, characterized by A plurality of circularly polarized antennas according to any one of claims 1-8 are included.

10. An electronic device, comprising: A circularly polarized antenna according to any one of claims 1-8 is included.

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