Circularly polarized array antenna and electronic equipment

Abstract

The invention discloses a circularly polarized array antenna and electronic equipment. The circularly polarized array antenna comprises a feed network layer, a signal radiation layer and a reflection metal layer. The feed network layer is used for generating a radiation signal based on an input signal. The signal radiation layer is connected with the feed network layer, and the signal radiation layer is used for transmitting radiation signals. The reflection metal layer is arranged between the feed network layer and the signal radiation layer, and the reflection metal layer is used for reflecting radiation signals radiated towards the feed network layer. The feed network layer and the signal radiation layer are separated and located in different layers through the reflection metal layer, the axial ratio bandwidth and the circular polarization gain of the circular polarization array antenna can be improved under the condition that the thickness of the circular polarization array antenna is reduced, the impedance bandwidth is improved, and the antenna performance is improved. The problem that miniaturization low profile, broadband and high gain of the existing circularly polarized array antenna cannot be considered at the same time is solved.

Description

Technical Field

[0001] The present application belongs to the technical field of microstrip antennas, and in particular, relates to a circularly polarized array antenna and electronic equipment. Background Art

[0002] At present, with the progress of wireless communication and the development of information science, new technologies are constantly emerging, and the miniaturization, integration, low profile, wide bandwidth and high performance of antennas are increasingly becoming the goals pursued by people. Microstrip patch antennas are small in size, light in weight and low in profile. They can conform to the carrier and can be integrated with active devices and circuits into a unified component. Therefore, they are suitable for large-scale production, simplifying the overall production and debugging, and greatly reducing costs.

[0003] In traditional designs, multi-layer parasitic microstrip array antennas are made of flexible substrates, which causes problems with processing accuracy and the existence of air layers between substrates, making the circular polarization characteristics and impedance matching of the array antennas significantly different from the simulation results. There is a problem that the low profile, miniaturization and wide bandwidth of the circularly polarized microstrip array antenna cannot be taken into account at the same time. Summary of the invention

[0004] The purpose of the present application is to provide a circularly polarized array antenna and electronic equipment, aiming to solve the problem that the traditional circularly polarized microstrip array antenna cannot take into account low profile, miniaturization and wide bandwidth.

[0005] A first aspect of an embodiment of the present application provides a circularly polarized array antenna, comprising: a feed network layer, the feed network layer being used to generate a radiation signal based on an input signal; a signal radiation layer, the signal radiation layer being connected to the feed network layer, the signal radiation layer being used to transmit the radiation signal; and a reflective metal layer, the reflective metal layer being arranged between the feed network layer and the signal radiation layer, the reflective metal layer being used to reflect the radiation signal radiated toward the feed network layer.

[0006] In one embodiment, the signal radiation layer includes a main radiation layer and a parasitic coupling radiation layer; the main radiation layer is arranged between the parasitic coupling radiation layer and the reflective metal layer, and the projection of the main radiation layer on the reflective metal layer coincides with the projection of the parasitic coupling radiation layer on the reflective metal layer.

[0007] In one embodiment, the invention comprises a first substrate, a second substrate and a third substrate which are stacked in sequence along a first direction; the parasitic coupling radiation layer is arranged on the first surface of the first substrate; the main radiation layer is arranged on the second surface of the first substrate; the reflective metal layer is arranged on the first surface of the third substrate; the feed network layer is arranged on the second surface of the third substrate, wherein the second surface of each substrate is in the first direction of the first surface.

[0008] In one embodiment, it also includes a metal wall surrounding the circularly polarized array antenna; the metal wall includes a metal sheet and a plurality of metal grounding holes; the metal sheet is arranged on the first surface of the first substrate and is arranged around the edge of the first substrate; one end of the metal grounding hole is connected to the metal sheet, and the second end of the metal grounding hole is connected to the reflective metal layer in the first direction of the metal sheet; and the plurality of metal grounding holes are arranged in parallel in sequence.

[0009] In one embodiment, the main radiation layer includes a first main radiation unit, a second main radiation unit, a third main radiation unit and a fourth main radiation unit; the first main radiation unit, the second main radiation unit, the third main radiation unit and the fourth main radiation unit are centrally symmetrical; the first main radiation unit, the second main radiation unit, the third main radiation unit and the fourth main radiation unit have the same shape, and the rotation angles of the first main radiation unit, the second main radiation unit, the third main radiation unit and the fourth main radiation unit are 0°, -90°, -180° and -270° respectively; the structure of the parasitic coupling radiation layer is the same as that of the main radiation layer.

[0010] In one embodiment, the feeding network layer includes a one-to-four power division feeding network, the one-to-four power division feeding network includes four output ends, and the four output ends of the one-to-four power division feeding network are respectively connected to the first main radiating unit, the second main radiating unit, the third main radiating unit and the fourth main radiating unit.

[0011] In one embodiment, the one-to-four power-dividing feeding network includes a first one-to-two power divider, a second one-to-two power divider, a third one-to-two power divider, a first transmission line, a second transmission line, a third transmission line, a fourth transmission line, a fifth transmission line, and a sixth transmission line; the first output end of the first one-to-two power divider is connected to the input end of the second one-to-two power divider through the first transmission line, the second output end of the first one-to-two power divider is connected to the input end of the third one-to-two power divider through the second transmission line; the first end of the third transmission line is connected to the first end of the second one-to-two power divider The output end is connected, the second end of the third transmission line is connected to the first main radiating unit; the first end of the fourth transmission line is connected to the second output end of the second one-to-two power splitter, and the second end of the fourth transmission line is connected to the second main radiating unit; the first end of the fifth transmission line is connected to the first output end of the third one-to-two power splitter, and the second end of the fifth transmission line is connected to the third main radiating unit; the first end of the sixth transmission line is connected to the second output end of the third one-to-two power splitter, and the second end of the sixth transmission line is connected to the fourth main radiating unit.

[0012] In one embodiment, four feeding probes are further included, and the four output ends of the one-to-four power division feeding network are respectively connected to the first main radiating unit, the second main radiating unit, the third main radiating unit and the fourth main radiating unit through the four feeding probes.

[0013] In one embodiment, the material of the feed network layer, the signal radiation layer and the reflective metal layer includes at least one of silver, gold, silver-plated metal and gold-plated metal.

[0014] A second aspect of an embodiment of the present application provides an electronic device, comprising the circularly polarized array antenna as described above.

[0015] Compared with the prior art, the embodiments of the present application have the following beneficial effects: the feed network layer and the signal radiation layer are separated and located in different layers by a reflective metal layer, so that the thickness of the circularly polarized array antenna can be reduced, the axial ratio bandwidth and circular polarization gain of the circularly polarized array antenna can be improved, and the impedance bandwidth can be increased, thereby solving the problem that the current circularly polarized array antenna cannot have both miniaturization and low profile and wide bandwidth and high gain. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of a circularly polarized array antenna provided in one embodiment of the present application;

[0017] Figure 2 Another schematic diagram of a circularly polarized array antenna provided in one embodiment of the present application;

[0018] Figure 3 A schematic side view of a circularly polarized array antenna provided in one embodiment of the present application;

[0019] Figure 4 Another schematic diagram of a circularly polarized array antenna provided by an embodiment of the present application;

[0020] Figure 5 A schematic diagram of a one-to-four power-dividing feeding network provided in an embodiment of the present application;

[0021] Figure 6 A return loss curve diagram provided for an embodiment of the present application;

[0022] Figure 7 A circular polarization axis ratio curve diagram provided for an embodiment of the present application;

[0023] Figure 8 A left-hand circularly polarized main radiation 3D pattern provided in an embodiment of the present application;

[0024] Fig. 9 A right-hand circularly polarized cross-radiation 3D pattern provided in an embodiment of the present application;

[0025] Fig.10 A schematic diagram of an electronic device provided in accordance with an embodiment of the present application. DETAILED DESCRIPTION

[0026] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0027] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0028] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0029] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0030] In order to obtain greater gain or to achieve specific directivity requirements, microstrip array antennas composed of microstrip radiating elements are often used.

[0031] Microstrip array antennas are arranged in two ways: linear array and planar array. Their feeding structures generally use series feeding and parallel feeding. However, when microstrip antenna arrays are applied to higher-frequency microwave bands, the dielectric loss of microstrip transmission lines, coupling and radiation within the feeding network will cause the efficiency of microstrip antenna arrays to drop sharply. This inefficiency problem is particularly prominent when the feeding network becomes large and complex.

[0032] Circularly polarized antennas can receive electromagnetic waves of any linear polarization, and the radiated circularly polarized electromagnetic waves can be received by antennas of any linear polarization. Circularly polarized antennas can effectively reduce the impact of multipath reflection, suppress the depolarization effect caused by climate such as rain and fog, and have strong anti-interference, which has received widespread attention. The circular polarization of a single microstrip patch antenna can be achieved through single-point feeding or multi-point feeding. The single-point fed microstrip patch antenna has a simple structure, but its circular polarization bandwidth is relatively narrow. In particular, it is more difficult to design antennas for use in Ku and above frequency bands, and the feeding network will introduce additional losses. Usually, circularly polarized antennas use dual feeding or multi-feeding to increase the axial ratio bandwidth. Generally, the more feeding points there are, the wider the axial ratio bandwidth, but this also makes the feeding network more complicated.

[0033] In traditional designs, multi-layer parasitic microstrip array antennas are made of flexible substrates, which causes problems with processing accuracy and the existence of air layers between substrates, making the circular polarization characteristics and impedance matching of the array antennas significantly different from the simulation results. There is a problem that the low profile, miniaturization and wide bandwidth of the circularly polarized microstrip array antenna cannot be taken into account at the same time.

[0034] Figure 1 A schematic diagram of a circularly polarized array antenna provided in an embodiment of the present application is shown. For ease of description, only the parts related to the present embodiment are shown, which are described in detail as follows:

[0035] The circular polarization array antenna 10 includes a feed network layer 100 , a signal radiation layer 200 and a reflective metal layer 300 .

[0036] The feed network layer 100 is used to generate a radiation signal based on an input signal. The signal radiation layer 200 is connected to the feed network layer 100, and the signal radiation layer 200 is used to transmit the radiation signal. The reflective metal layer 300 is arranged between the feed network layer 100 and the signal radiation layer 200, and the reflective metal layer 300 is used to reflect the radiation signal radiated toward the feed network layer 100.

[0037] By separating the feed network layer 100 and the signal radiation layer 200 and locating them in different layers through the reflective metal layer 300, the axial ratio bandwidth and circular polarization gain of the circular polarization array antenna 10 can be improved while reducing the thickness of the circular polarization array antenna 10, and the impedance bandwidth can be increased, thereby solving the problem that the current circular polarization array antenna 10 cannot have both miniaturization and low profile and wide bandwidth and high gain.

[0038] The frequency band of the input signal may be a frequency band of Ku or above.

[0039] In one embodiment, if Figure 2As shown, the signal radiation layer 200 includes a main radiation layer 210 and a parasitic coupling radiation layer 220. The main radiation layer 210 is disposed between the parasitic coupling radiation layer 220 and the reflective metal layer 300, the main radiation layer 210 is connected to the feed network layer 100, and the projection of the main radiation layer 210 on the reflective metal layer 300 coincides with the projection of the parasitic coupling radiation layer 220 on the reflective metal layer 300.

[0040] By adopting the structure of mutually coupled main radiation layer 210 and parasitic coupling radiation layer 220, since the distance from the main radiation layer 210 to the reflective metal layer 300 is different from the distance from the parasitic coupling radiation layer 220 to the reflective metal layer 300, the generated resonant frequency points are also different. By controlling the specific parameters of the distance from the main radiation layer 210 to the reflective metal layer 300 and the distance from the parasitic coupling radiation layer 220 to the reflective metal layer 300, the main radiation layer 210 and the parasitic coupling radiation layer 220 can be made to resonate near the frequency point of the center frequency of the circularly polarized array antenna 10, thereby expanding the impedance bandwidth and circular polarization bandwidth of the circularly polarized array antenna 10.

[0041] In one embodiment, if Figure 3 As shown, the circularly polarized array antenna 10 further includes a first substrate 400, a second substrate 500, and a third substrate 600 which are sequentially stacked along a first direction. The parasitic coupling radiation layer 220 is disposed on the first surface of the first substrate 400. The main radiation layer 210 is disposed on the second surface of the first substrate 400. The reflective metal layer 300 is disposed on the first surface of the third substrate 600. The feed network layer 100 is disposed on the second surface of the third substrate 600, wherein the second surfaces of the respective substrates are in the first direction of the first surface.

[0042] It is understandable that the feed network layer 100, the signal radiation layer 200 and the reflective metal layer 300 can be constructed on each substrate by etching and other processes.

[0043] The specific thicknesses of the first substrate 400 , the second substrate 500 and the third substrate 600 may be configured according to specific requirements for the spacing between the feed network layer 100 , the signal radiation layer 200 and the reflective metal layer 300 .

[0044] Exemplarily, the first direction may be a vertical direction from top to bottom. Therefore, the second surface of each substrate is below the first surface, the first surface of each substrate is the upper surface of the substrate, and the second surface of each substrate is the lower surface of the substrate. For ease of description, the first direction in the subsequent embodiments is described based on the first direction of this embodiment.

[0045] In one embodiment, if Figure 4As shown, the circular polarization array antenna 10 further includes a metal wall 700 surrounding the circular polarization array antenna 10. The metal wall 700 includes a metal sheet 710 and a plurality of metal grounding holes 720.

[0046] The metal sheet 710 is disposed on the first surface of the first substrate 400 and is disposed around the edge of the first substrate 400. One end of the metal grounding hole 720 is connected to the metal sheet 710, and the second end of the metal grounding hole 720 is connected to the reflective metal layer 300 in the first direction of the metal sheet 710. A plurality of metal grounding holes 720 are arranged in parallel in sequence.

[0047] By designing a metal wall 700 with a certain width around the circularly polarized array antenna 10, the axial ratio bandwidth and circular polarization gain of the circularly polarized array antenna 10 can be improved, the impedance bandwidth can be increased, and the circular polarization characteristics can be optimized.

[0048] The spacing between the metal grounding holes 720 can be set according to actual needs. In some embodiments, the spacing between adjacent metal grounding holes 720 is less than 1 mm.

[0049] In one embodiment, if Figure 4 As shown, the main radiation layer 210 includes a first main radiation unit 211, a second main radiation unit 212, a third main radiation unit 213 and a fourth main radiation unit 214. The first main radiation unit 211, the second main radiation unit 212, the third main radiation unit 213 and the fourth main radiation unit 214 are centrally symmetrical. The first main radiation unit 211, the second main radiation unit 212, the third main radiation unit 213 and the fourth main radiation unit 214 have the same shape, and the rotation angles of the first main radiation unit 211, the second main radiation unit 212, the third main radiation unit 213 and the fourth main radiation unit 214 are 0°, -90°, -180° and -270° respectively. The structure of the parasitic coupling radiation layer 220 is the same as that of the main radiation layer 210.

[0050] By rotating each main radiation unit separately, the circular polarization axial ratio bandwidth and circular polarization gain of the circular polarization array antenna 10 can be improved.

[0051] Specifically, Figure 4As shown, the parasitic coupling radiation layer 220 also includes a first parasitic coupling radiation unit 221, a second parasitic coupling radiation unit 222, a third parasitic coupling radiation unit 223 and a fourth parasitic coupling radiation unit 224 corresponding to the first main radiation unit 211, the second main radiation unit 212, the third main radiation unit 213 and the fourth main radiation unit 214. The first main radiation unit 211, the second main radiation unit 212, the third main radiation unit 213 and the fourth main radiation unit 214 can use the center of the second surface of the first substrate 400 as the symmetry center. It can be understood that the rotation angle of the main radiation unit refers to the angle of rotation with the center of the main radiation unit as the rotation center.

[0052] In some embodiments, if the first substrate 400 is viewed along the first direction, the first main radiation unit 211, the second main radiation unit 212, the third main radiation unit 213 and the fourth main radiation unit 214 are arranged in sequence along the clockwise direction. Exemplarily, the rotation angle of the second main radiation unit 212 is -90°, that is, the center of the second main radiation unit 212 is the rotation center, and it rotates 90° counterclockwise.

[0053] In some embodiments, Figure 4 As shown, the first main radiation unit 211, the second main radiation unit 212, the third main radiation unit 213 and the fourth main radiation unit 214 all include metal patches of the same shape and size. It can be understood that the parasitic coupling radiation layer 220 also includes four metal patches that are the same as the first main radiation unit 211, the second main radiation unit 212, the third main radiation unit 213 and the fourth main radiation unit 214.

[0054] The metal patch is specifically a rectangular patch with a pair of cut corners. A pair of opposite sides of the metal patch are also provided with gaps perpendicular to the opposite sides, which are used to expand the bandwidth of the circular polarization array antenna 10.

[0055] It can be understood that the main radiation units of this embodiment constitute a radiation array of 2×2 units. In some embodiments, the main radiation layer 210 includes multiple main radiation units to form a radiation array of 4×4 units or a radiation array of 8×8 units, which will not be repeated in this application.

[0056] In one embodiment, if Figure 5 As shown, the feed network layer 100 includes a one-to-four power division feeding network 110, and the one-to-four power division feeding network 110 includes four output ends for respectively outputting radiation signals with phase differences of 0°, -90°, -180° and -270°, and the four output ends of the one-to-four power division feeding network 110 are respectively connected to the first main radiating unit 211, the second main radiating unit 212, the third main radiating unit 213 and the fourth main radiating unit 214.

[0057] It can be understood that the rotation angle of the main radiation unit corresponds to the phase difference of the radiation signal. Exemplarily, the first main radiation unit 211 with a rotation angle of 0° is used to transmit a radiation signal with a phase difference of 0°, the first main radiation unit 211 with a rotation angle of -90° is used to transmit a radiation signal with a phase difference of -90°, the first main radiation unit 211 with a rotation angle of -180° is used to transmit a radiation signal with a phase difference of -180°, and the first main radiation unit 211 with a rotation angle of -270° is used to transmit a radiation signal with a phase difference of -270°.

[0058] It should be noted that the radiation signal with a phase difference of 0° can be regarded as a reference signal, there is a phase difference of -90° between the radiation signal with a phase difference of -90° and the reference signal, there is a phase difference of -180° between the radiation signal with a phase difference of -180° and the reference signal, and there is a phase difference of -270° between the radiation signal with a phase difference of -270° and the reference signal.

[0059] In one embodiment, the one-to-four power splitting feeding network 110 includes a first one-to-two power splitter 111, a second one-to-two power splitter 112, a third one-to-two power splitter 113, a first transmission line 114, a second transmission line 115, a third transmission line 116, a fourth transmission line 117, a fifth transmission line 118 and a sixth transmission line 119.

[0060] The first output end of the first one-to-two power divider 111 is connected to the input end of the second one-to-two power divider 112 through the first transmission line 114, and the second output end of the first one-to-two power divider 111 is connected to the input end of the third one-to-two power divider 113 through the second transmission line 115. The first end of the third transmission line 116 is connected to the first output end of the second one-to-two power divider 112, and the second end of the third transmission line 116 is connected to the first main radiation unit 211. The first end of the fourth transmission line 117 is connected to the second output end of the second one-to-two power divider 112, and the second end of the fourth transmission line 117 is connected to the second main radiation unit 212. The first end of the fifth transmission line 118 is connected to the first output end of the third one-to-two power divider 113, and the second end of the fifth transmission line 118 is connected to the third main radiation unit 213. The first end of the sixth transmission line 119 is connected to the second output end of the third one-to-two power divider 113, and the second end of the sixth transmission line 119 is connected to the fourth main radiation unit 214.

[0061] Specifically, in some embodiments, the first one-to-two power divider 111, the second one-to-two power divider 112, and the third one-to-two power divider 113 are all Wilkinson power dividers. The first output terminal and the second output terminal of the first one-to-two power divider 111 are also connected through a first isolation resistor, the first output terminal and the second output terminal of the second one-to-two power divider 112 are also connected through a second isolation resistor, and the first output terminal and the second output terminal of the third one-to-two power divider 113 are also connected through a third isolation resistor. The resistance values ​​of the first isolation resistor, the second isolation resistor, and the third isolation resistor can be 100Ω.

[0062] It should be noted that the first transmission line 114, the second transmission line 115, the third transmission line 116, the fourth transmission line 117, the fifth transmission line 118 and the sixth transmission line 119 need to be configured according to the parameters of the input signal. Specifically, assuming that the wavelength of the input signal is λ, the length difference between the first transmission line 114 and the second transmission line 115 is λ / 2, so that there is a 180° phase difference between the signals transmitted to the second one-to-two power divider 112 and the third one-to-two power divider 113.

[0063] The length difference between the third transmission line 116 and the fourth transmission line 117 is λ / 4, so that there is a 90° phase difference between the signals transmitted to the first main radiation unit 211 and the second main radiation unit 212. The length difference between the fifth transmission line 118 and the sixth transmission line 119 is λ / 4, so that there is a 90° phase difference between the signals transmitted to the third main radiation unit 213 and the fourth main radiation unit 214. Thus, radiation signals with phase differences of 0°, -90°, -180° and -270° are finally generated.

[0064] In one embodiment, if Figure 3 As shown, the circularly polarized array antenna 10 also includes four feeding probes 800, and the four output ends of the one-to-four power division feeding network 110 are respectively connected to the first main radiating element 211, the second main radiating element 212, the third main radiating element 213 and the fourth main radiating element 214 through the four feeding probes 800.

[0065] It can be understood that the reflective metal layer 300 is further provided with via holes corresponding to the four feeding probes 800 to avoid the four feeding probes 800 .

[0066] In one embodiment, the material of the feed network layer 100 , the signal radiation layer 200 and the reflective metal layer 300 includes at least one of silver, gold, silver-plated metal and gold-plated metal.

[0067] Preferably, the feed network layer 100 , the signal radiation layer 200 and the reflective metal layer 300 may be made of low-temperature silver paste.

[0068] In some embodiments, the circular polarization array antenna 10 has a size of 25.00 mm×25.00 mm×1.59 mm (length×width×height).

[0069] For example, in the case where the reflective metal layer 300 separates the feed network layer 100 from the signal radiation layer 200 and a metal wall 700 is provided, the S11 curve of the circularly polarized array antenna 10 of the 2×2 units in one embodiment is as follows: Figure 6 As shown in FIG. 1 , the impedance bandwidth of S11 < -10 dB covers 9.28 GHz to 17.28 GHz, and the relative bandwidth reaches 60.24%. Figure 7 As shown, the bandwidth of the circular polarization axial ratio AR≤3 covers 9.83GHz~15.21GHz, at this time the relative axial ratio bandwidth reaches 42.9%, the main polarization is left-hand circular polarization, and the maximum gain can reach 8.7dBi. It can be seen that the circular polarization array antenna 10 of the embodiment of the present application can obtain a larger bandwidth under this size condition. At the same time, the left-hand circular polarization main radiation 3D pattern of the circular polarization array antenna 10 with 2×2 units is as follows Figure 8 As shown, the right-hand circularly polarized cross-radiation 3D pattern of the 2×2 unit circularly polarized array antenna 10 is as follows: Fig. 9 It is understandable that the circularly polarized array antenna 10 can also increase the number of main radiation units according to actual needs, and adaptively adjust the feed network layer 100. For example, a 4×4 unit or 8×8 unit architecture can be used to further enhance directivity and gain.

[0070] The reflective metal layer 300 can prevent the signal radiation layer 200 from affecting the feed network layer 100 , thereby reducing the distance between the signal radiation layer 200 and the feed network layer 100 , and ultimately achieving miniaturization of the circularly polarized array antenna 10 .

[0071] In some embodiments, the material of the first substrate 400 , the second substrate 500 , and the third substrate 600 may include Low Temperature Co-fired Ceramic (LTCC).

[0072] Fig.10 A schematic diagram of an electronic device 20 provided in an embodiment of the present application is shown. For ease of description, only the parts related to the present embodiment are shown, which are described in detail as follows:

[0073] An electronic device 20 includes the circularly polarized array antenna 10 as described above. The electronic device 20 may be a communication device, an identification device, or a positioning device.

[0074] The technicians in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0075] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0076] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A circularly polarized array antenna, characterized in that: include: A feed network layer, the feed network layer is used to generate a radiation signal based on an input signal; a signal radiation layer, the signal radiation layer being connected to the feed network layer, and the signal radiation layer being used to transmit the radiation signal; A reflective metal layer, wherein the reflective metal layer is arranged between the feed network layer and the signal radiation layer, and the reflective metal layer is used to reflect the radiation signal radiated toward the feed network layer.

2. The circularly polarized array antenna according to claim 1, characterized in that: The signal radiation layer includes a main radiation layer and a parasitic coupling radiation layer; The main radiation layer is arranged between the parasitic coupling radiation layer and the reflective metal layer, the main radiation layer is connected to the feed network layer, and the projection of the main radiation layer on the reflective metal layer coincides with the projection of the parasitic coupling radiation layer on the reflective metal layer.

3. The circularly polarized array antenna according to claim 2, characterized in that: It includes a first substrate, a second substrate and a third substrate which are sequentially stacked along a first direction; The parasitic coupling radiation layer is arranged on the first surface of the first substrate; the main radiation layer is arranged on the second surface of the first substrate; and the reflective metal layer is arranged on the first surface of the third substrate; The feed network layer is disposed on the second surface of the third substrate, wherein the second surface of each substrate is in the first direction of the first surface.

4. The circularly polarized array antenna according to claim 3, characterized in that: It also includes a metal wall surrounding the circularly polarized array antenna; the metal wall includes a metal sheet and a plurality of metal grounding holes; The metal sheet is disposed on the first surface of the first substrate and surrounds the edge of the first substrate; One end of the metal grounding hole is connected to the metal sheet, and a second end of the metal grounding hole is connected to the reflective metal layer in a first direction of the metal sheet; a plurality of the metal grounding holes are arranged in parallel in sequence.

5. The circularly polarized array antenna according to any one of claims 2 to 4, characterized in that: The main radiation layer includes a first main radiation unit, a second main radiation unit, a third main radiation unit and a fourth main radiation unit; The first main radiation unit, the second main radiation unit, the third main radiation unit and the fourth main radiation unit are centrally symmetrical; The first main radiation unit, the second main radiation unit, the third main radiation unit and the fourth main radiation unit have the same shape, and the rotation angles of the first main radiation unit, the second main radiation unit, the third main radiation unit and the fourth main radiation unit are 0°, -90°, -180° and -270° respectively; The structure of the parasitic coupling radiation layer is the same as that of the main radiation layer.

6. The circularly polarized array antenna according to claim 5, characterized in that: The feeding network layer includes a one-to-four power division feeding network, which includes four output ends for respectively outputting the radiation signals with phase differences of 0°, -90°, -180° and -270°, and the four output ends of the one-to-four power division feeding network are respectively connected to the first main radiating unit, the second main radiating unit, the third main radiating unit and the fourth main radiating unit.

7. The circularly polarized array antenna according to claim 6, characterized in that: The one-to-four power-dividing feeding network comprises a first one-to-two power splitter, a second one-to-two power splitter, a third one-to-two power splitter, a first transmission line, a second transmission line, a third transmission line, a fourth transmission line, a fifth transmission line and a sixth transmission line; The first output end of the first one-to-two power splitter is connected to the input end of the second one-to-two power splitter through the first transmission line, and the second output end of the first one-to-two power splitter is connected to the input end of the third one-to-two power splitter through the second transmission line; The first end of the third transmission line is connected to the first output end of the second one-to-two power splitter, and the second end of the third transmission line is connected to the first main radiating unit; the first end of the fourth transmission line is connected to the second output end of the second one-to-two power splitter, and the second end of the fourth transmission line is connected to the second main radiating unit; the first end of the fifth transmission line is connected to the first output end of the third one-to-two power splitter, and the second end of the fifth transmission line is connected to the third main radiating unit; the first end of the sixth transmission line is connected to the second output end of the third one-to-two power splitter, and the second end of the sixth transmission line is connected to the fourth main radiating unit.

8. The circularly polarized array antenna according to claim 6, characterized in that: It also includes four feeding probes, and the four output ends of the one-to-four power division feeding network are respectively connected to the first main radiating unit, the second main radiating unit, the third main radiating unit and the fourth main radiating unit through the four feeding probes.

9. The circularly polarized array antenna according to any one of claims 1 to 4, characterized in that: The material of the feed network layer, the signal radiation layer and the reflective metal layer includes at least one of silver, gold, silver-plated metal and gold-plated metal.

10. An electronic device, characterized in that: It comprises the circularly polarized array antenna as described in any one of claims 1 to 9.

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