Circularly polarized antenna structure and vehicle-mounted satellite navigation system

Abstract

The invention provides a circularly polarized antenna structure and a vehicle-mounted satellite navigation system. The circularly polarized antenna structure comprises a feed panel body, a radiation assembly and a coupling assembly, the feed panel body comprises a grounding plate layer and a feed substrate layer which are connected with each other; the feed substrate layer is provided with a feed network wire body and a plurality of feed parts, and each feed part is electrically connected with the feed network wire body; the radiation assembly is provided with a plurality of feed branch parts and a plurality of radiation bending parts, and each feed branch part penetrates through the corresponding avoidance groove and is electrically connected with the corresponding feed part; the plurality of first coupling pieces and the plurality of second coupling pieces are alternately arranged around the center of the radiation assembly, and each first coupling piece and each second coupling piece are electrically connected with the grounding plate layer; each first coupling bending part is vertically coupled with the corresponding radiation bending part; and each third coupling bending part is vertically coupled with the corresponding second coupling bending part. The circularly polarized antenna structure is low in manufacturing cost.

Description

Technical Field

[0001] The present disclosure relates to the technical field of antenna structures, and particularly to a circularly polarized antenna structure and a vehicle-mounted satellite navigation system. Background Art

[0002] A vehicle-mounted satellite navigation system is a navigation device that determines the position of a vehicle in real time by receiving GPS (Global Positioning System) satellite signals orbiting the earth, and provides information such as driving routes and road conditions. The vehicle-mounted satellite navigation system consists of a host and an antenna structure, etc., and the antenna structure is electrically connected to the host.

[0003] The antenna structure of the related art includes a metal base, a circuit board, a radio frequency connector and an antenna assembly. The circuit board is coaxially arranged on the metal base, the radio frequency connector is located inside the metal base, the upper end of the radio frequency connector passes through the upper surface of the metal base and is electrically connected to the circuit board, the antenna assembly is located above the circuit board, and the antenna assembly is connected to the metal base; the antenna assembly includes five layers of antennas stacked sequentially from top to bottom, and the five layers of antennas work in different frequency bands respectively, such as the Chinese patent with the patent number CN112928496B.

[0004] However, since the antenna assembly includes five layers of antennas stacked sequentially from top to bottom, and the five layers of antennas work in different frequency bands respectively, the antenna structure adopts the antenna stacking method for antenna layout, so that the lower layer of antennas covers the frequency band of the low-frequency part, and the upper layer of antennas covers the frequency band of the high-frequency part, so that the antenna structure realizes the coverage processing of multiple frequency bands through the antenna stacking setting, so that the layout layer number of the antenna structure is relatively large, resulting in a large material requirement for the production of the antenna structure, and further making the production cost of the antenna structure relatively high. Summary of the Invention

[0005] The purpose of the present disclosure is to overcome the deficiencies in the prior art, and provide a circularly polarized antenna structure and a vehicle-mounted satellite navigation system with relatively low production costs.

[0006] The purpose of the present disclosure is achieved by the following technical solutions:

[0007] A circularly polarized antenna structure, comprising:

[0008] The feed board body includes a ground board layer and a feed substrate layer that are connected to each other. The ground board layer is provided with a plurality of avoidance slots, and the plurality of avoidance slots are arranged at intervals around the center of the ground board layer; the feed substrate layer is provided with a feed network wire body and a plurality of feed parts, and each feed part is electrically connected to the feed network wire body, and each feed part is located in the corresponding avoidance slot; the feed network wire body is respectively used for being electrically connected to a Wilkinson power divider, a Schiffman phase shifter, a first composite left-handed and right-handed transmission line phase shifter, and a second composite left-handed and right-handed transmission line phase shifter;

[0009] The radiation assembly is provided with a plurality of feed branch parts and a plurality of radiation bending parts. Each feed branch part penetrates through the corresponding avoidance slot and is electrically connected to the corresponding feed part, and a connection area is formed between two adjacent feed branch parts; the plurality of radiation bending parts are arranged at intervals around the center of the radiation assembly, and each radiation bending part is located in the corresponding connection area;

[0010] The coupling assembly includes a plurality of first coupling parts and a plurality of second coupling parts. The plurality of first coupling parts and the plurality of second coupling parts are arranged alternately around the center of the radiation assembly, and each first coupling part and each second coupling part are electrically connected to the ground board layer; each first coupling part is provided with a first coupling bending part and a second coupling bending part that are oppositely arranged, and each first coupling bending part is perpendicularly coupled to the corresponding radiation bending part; each second coupling part is provided with a third coupling bending part, and each third coupling bending part is perpendicularly coupled to the corresponding second coupling bending part.

[0011] In one embodiment, each feed part is a feed probe structure.

[0012] In one embodiment, the radiation assembly further includes a radiation sheet body. Each feed branch part and each radiation bending part are connected to the radiation sheet body. The plurality of feed branch parts are arranged at intervals around the center of the radiation sheet body, so that two adjacent feed branch parts and the radiation sheet body jointly form the connection area; the plurality of radiation bending parts are arranged at intervals around the center of the radiation sheet body.

[0013] In one embodiment, the radiation sheet body, the plurality of feed branch parts, and the plurality of radiation bending parts are an integrally formed structure.

[0014] In one embodiment, each first coupling part includes a first coupling sheet body and a first branch sheet body that are connected to each other. Each first branch sheet body is electrically connected to the ground board layer, and each first coupling sheet body is provided with the first coupling bending part and the second coupling bending part that are oppositely arranged.

[0015] In one embodiment, each of the first coupling sheet bodies and the corresponding first stub sheet bodies is an integrally formed structure.

[0016] In one embodiment, each of the second coupling members includes a second coupling sheet body and a second stub sheet body connected to each other. Each of the second stub sheet bodies is electrically connected to the ground plane layer, and each of the second coupling sheet bodies is provided with the third coupling bending portion.

[0017] In one embodiment, each of the second coupling sheet bodies and the corresponding second stub sheet bodies is an integrally formed structure.

[0018] In one embodiment, the feeding substrate layer is further provided with a plurality of connecting columns. The plurality of connecting columns are arranged at intervals, and each of the connecting columns is electrically connected to the feeding network line body.

[0019] A vehicle-mounted satellite navigation system includes the circularly polarized antenna structure according to any one of the above embodiments.

[0020] Compared with the prior art, the present disclosure has at least the following advantages:

[0021] 1. Since each feeding portion is electrically connected to the feeding network line body, the feeding network line bodies are respectively used to be electrically connected to a Wilkinson power divider, a Schiffman phase shifter, a first composite right / left-handed transmission line phase shifter, and a second composite right / left-handed transmission line phase shifter to form a feeding network. Each feeding stub portion is electrically connected to the corresponding feeding portion so that each feeding portion is electrically connected to the radiation assembly. Each first coupling member and each second coupling member are electrically connected to the ground plane layer. Each first coupling bending portion is perpendicularly coupled to the corresponding radiation bending portion, and each third coupling bending portion is perpendicularly coupled to the corresponding second coupling bending portion to form a signal transmission path. The Wilkinson power divider is a radio frequency device, and the Schiffman phase shifter is used to adjust the phase of the signal to achieve a 180° phase shift of the signal. The composite right / left-handed transmission line phase shifter is used to adjust the phase of the signal to achieve a 90° phase shift of the signal, so that the feeding network generates excitations with equal amplitude and a phase difference of 90°, thereby enabling the circularly polarized antenna structure to meet the circular polarization requirements, enabling the circularly polarized antenna structure to operate in different frequency bands, enabling the circularly polarized antenna structure to not only cover the frequency bands of the low-frequency part but also cover the frequency bands of the high-frequency part, and thus enabling the circularly polarized antenna structure to achieve multi-band coverage processing, and further solving the problem in the prior art that the antenna structure realizes multi-band coverage processing through antenna stacking.

[0022] 2. Since each feeding part is electrically connected to the feeding network line body, and each feeding stub part is electrically connected to the corresponding feeding part so that each feeding part is electrically connected to the radiation component, a plurality of first coupling parts and a plurality of second coupling parts are arranged alternately around the center of the radiation component. Each first coupling part and each second coupling part are electrically connected to the grounding layer. Each first coupling bending part is perpendicularly coupled to the corresponding radiation bending part, and each third coupling bending part is perpendicularly coupled to the corresponding second coupling bending part, so that the radiation component and the coupling component are arranged on the same layer, completing the layout setting of the circularly polarized antenna structure. Thus, the problem of the antenna layout in the prior art using the antenna stacked arrangement method is avoided, and further, the problem of the multi-band coverage processing of the antenna structure in the prior art by means of antenna stacked arrangement is solved, so that the layout layer number of the circularly polarized antenna structure is less, the material requirement for manufacturing the circularly polarized antenna structure is smaller, and further, the manufacturing cost of the circularly polarized antenna structure is lower. Description of the Drawings

[0023] To more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present disclosure and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0024] Figure 1 Structural schematic diagram of the circularly polarized antenna structure of an embodiment;

[0025] Figure 2 is Figure 1 Structural schematic diagram of another perspective of the circularly polarized antenna structure shown;

[0026] Figure 3 is Figure 1 Structural schematic diagram of the feeding plate body of the circularly polarized antenna structure shown;

[0027] Figure 4 is Figure 1 Exploded structural schematic diagram of the feeding plate body of the circularly polarized antenna structure shown;

[0028] Figure 5 is Figure 1 Structural schematic diagram of the radiation component of the circularly polarized antenna structure shown;

[0029] Figure 6 is Figure 1 Structural schematic diagram of the first coupling part of the circularly polarized antenna structure shown;

[0030] Figure 7 is Figure 1Schematic diagram of the structure of the second coupling member of the circularly polarized antenna structure shown;

[0031] Figure 8 Echo loss simulation schematic diagram of the circularly polarized antenna structure of an embodiment;

[0032] Figure 9 Gain simulation schematic diagram of the circularly polarized antenna structure of an embodiment at 1.176 GHz;

[0033] Figure 10 Axial ratio beamwidth simulation schematic diagram of the circularly polarized antenna structure of an embodiment at 1.176 GHz;

[0034] Figure 11 Gain simulation schematic diagram of the circularly polarized antenna structure of an embodiment at 1.575 GHz;

[0035] Figure 12 Axial ratio beamwidth simulation schematic diagram of the circularly polarized antenna structure of an embodiment at 1.575 GHz. Detailed implementation manners

[0036] For ease of understanding of the present disclosure, the present disclosure will be described more comprehensively below with reference to the relevant drawings. Preferred embodiments of the present disclosure are shown in the drawings. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided so that the disclosure of the present disclosure can be understood more thoroughly and comprehensively.

[0037] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present disclosure belongs. The terms used herein in the specification of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0039] The present disclosure provides a circularly polarized antenna structure, which includes a feeding plate body, a radiation component and a coupling component; the feeding plate body includes a grounding plate layer and a feeding substrate layer connected to each other, the grounding plate layer is provided with a plurality of avoidance grooves, and the plurality of avoidance grooves are arranged at intervals around the center of the grounding plate layer; the feeding substrate layer is provided with a feeding network wire body and a plurality of feeding parts, each feeding part is electrically connected to the feeding network wire body, and each feeding part is located in a corresponding avoidance groove; the feeding network wire body is respectively used for being electrically connected to a Wilkinson power divider, a Schiffman phase shifter, a first composite left-handed and right-handed transmission line phase shifter and a second composite left-handed and right-handed transmission line phase shifter; the radiation component is provided with a plurality of feeding branch parts and a plurality of radiation bending parts, each feeding branch part penetrates through a corresponding avoidance groove and is electrically connected to a corresponding feeding part, and a connection area is formed between two adjacent feeding branch parts; the plurality of radiation bending parts are arranged at intervals around the center of the radiation component, and each radiation bending part is located in a corresponding connection area; the coupling component includes a plurality of first coupling parts and a plurality of second coupling parts, the plurality of first coupling parts and the plurality of second coupling parts are arranged alternately around the center of the radiation component, and each first coupling part and each second coupling part are electrically connected to the grounding plate layer; each first coupling part is provided with a first coupling bending part and a second coupling bending part oppositely arranged, and each first coupling bending part is perpendicularly coupled to a corresponding radiation bending part; each second coupling part is provided with a third coupling bending part, and each third coupling bending part is perpendicularly coupled to a corresponding second coupling bending part.

[0040] In the above circularly polarized antenna structure, since each feeding part is electrically connected to the feeding network wire body, and the feeding network wire body is respectively used for being electrically connected to a Wilkinson power divider, a Schiffman phase shifter, a first composite left-handed and right-handed transmission line phase shifter and a second composite left-handed and right-handed transmission line phase shifter to form a feeding network, each feeding branch part is electrically connected to a corresponding feeding part so that each feeding part is electrically connected to the radiation component, each first coupling part and each second coupling part are electrically connected to the grounding plate layer, each first coupling bending part is perpendicularly coupled to a corresponding radiation bending part, and each third coupling bending part is perpendicularly coupled to a corresponding second coupling bending part to form a signal transmission path; the Wilkinson power divider is a radio frequency device, the Schiffman phase shifter is used for adjusting the phase of a signal to enable the signal to achieve a 180° phase shift, and the composite left-handed and right-handed transmission line phase shifter is used for adjusting the phase of a signal to enable the signal to achieve a 90° phase shift, so that the feeding network generates excitations with equal amplitude and a phase difference of 90°, thereby enabling the circularly polarized antenna structure to meet the circular polarization requirements, enabling the circularly polarized antenna structure to operate in different frequency bands, enabling the circularly polarized antenna structure to not only cover the frequency bands of the low-frequency part, but also cover the frequency bands of the high-frequency part, thereby enabling the circularly polarized antenna structure to achieve multi-band coverage processing, and further solving the problem in the prior art that the antenna structure realizes multi-band coverage processing through antenna stacking.

[0041] Since each feeding part is electrically connected to the feeding network wire body, and each feeding stub part is electrically connected to the corresponding feeding part so that each feeding part is electrically connected to the radiation component, a plurality of first coupling parts and a plurality of second coupling parts are alternately arranged around the center of the radiation component. Each first coupling part and each second coupling part are electrically connected to the ground plane layer. Each first coupling bending part is vertically coupled to the corresponding radiation bending part, and each third coupling bending part is vertically coupled to the corresponding second coupling bending part, so that the radiation component and the coupling component are arranged on the same layer, completing the layout setting of the circularly polarized antenna structure. Thus, the problem of the antenna layout in the prior art using the antenna stacked arrangement method is avoided. Furthermore, the problem of realizing multi-band coverage processing through the antenna stacked arrangement in the prior art antenna structure is solved, so that the layout layer number of the circularly polarized antenna structure is less, the material requirement for manufacturing the circularly polarized antenna structure is smaller, and thus the manufacturing cost of the circularly polarized antenna structure is lower.

[0042] To better understand the technical solutions and beneficial effects of the present disclosure, the following further elaborates on the present disclosure with specific embodiments:

[0043] Such as Figures 1 to 12As shown, the circularly polarized antenna structure 10 of an embodiment includes a feeding plate body 100, a radiation assembly 200, and a coupling assembly 300. The feeding plate body 100 includes a ground plane layer 110 and a feeding substrate layer 120 connected to each other. The ground plane layer 110 is provided with a plurality of avoidance slots 111, and the plurality of avoidance slots 111 are arranged at intervals around the center of the ground plane layer 110. The feeding substrate layer 120 is provided with a feeding network wire body 121 and a plurality of feeding parts 122. Each feeding part 122 is electrically connected to the feeding network wire body 121, and each feeding part 122 is located in a corresponding avoidance slot 111. The feeding network wire body 121 is respectively used for electrically connecting to a Wilkinson power divider, a Schiffman phase shifter, a first composite left-handed and right-handed transmission line phase shifter, and a second composite left-handed and right-handed transmission line phase shifter. The radiation assembly 200 is provided with a plurality of feeding branch parts 210 and a plurality of radiation bending parts 220. Each feeding branch part 210 penetrates through a corresponding avoidance slot 111 and is electrically connected to a corresponding feeding part 122. A connection area 211 is formed between two adjacent feeding branch parts 210. The plurality of radiation bending parts 220 are arranged at intervals around the center of the radiation assembly 200, and each radiation bending part 220 is located in a corresponding connection area 211. The coupling assembly 300 includes a plurality of first coupling parts 310 and a plurality of second coupling parts 320. The plurality of first coupling parts 310 and the plurality of second coupling parts 320 are arranged alternately around the center of the radiation assembly 200. Each first coupling part 310 and each second coupling part 320 are electrically connected to the ground plane layer 110. Each first coupling part 310 is provided with a first coupling bending part 3111a and a second coupling bending part 3112a oppositely arranged, and each first coupling bending part 3111a is perpendicularly coupled to a corresponding radiation bending part 220. Each second coupling part 320 is provided with a third coupling bending part 3211, and each third coupling bending part 3211 is perpendicularly coupled to a corresponding second coupling bending part 3112a.

[0044] In this embodiment, each feeding part 122 is electrically connected to the feeding network wire body 121, and the feeding network wire body 121 is respectively used for electrically connecting to a Wilkinson power divider, a Schiffman phase shifter, a first composite left-handed and right-handed transmission line phase shifter, and a second composite left-handed and right-handed transmission line phase shifter to form a feeding network.

[0045] Furthermore, the numbers of the feeding unit 122, the avoidance slot 111, the feeding stub unit 210, the radiation bending unit 220, the first coupler 310, and the second coupler 320 are all four, so that the feeding network is a four-feed network. The Wilkinson power divider is a radio frequency device, and the Schiffman phase shifter is used to adjust the phase of the signal to achieve a 180° phase shift of the signal. The composite right / left-handed transmission line phase shifter is used to adjust the phase of the signal to achieve a 90° phase shift of the signal, so that the feeding network forms four signals with a 90° phase difference, so that the feeding network generates an excitation with equal amplitude and a 90° phase difference, so as to make the circularly polarized antenna structure 10 meet the circular polarization requirements.

[0046] Furthermore, the ground plane layer 110 is a grounded metal plate layer, so that the ground plane layer 110 provides a return path for the current of the circularly polarized antenna structure 10 and improves the radiation efficiency of the circularly polarized antenna structure. Moreover, by setting the ground plane layer 110, the circularly polarized antenna structure 10 can enhance the reflection and diffusion of the signal, improve the stability of the circularly polarized antenna structure 10 for receiving signals, and thus reduce the signal loss rate and jitter rate.

[0047] Furthermore, each first coupling bending part 3111a is perpendicularly coupled to the corresponding radiation bending part 220 to form a vertical component of the electric field; each third coupling bending part 3211 is perpendicularly coupled to the corresponding second coupling bending part 3112a to form a horizontal component of the electric field, and the horizontal component of the electric field has the same amplitude as the vertical component of the electric field.

[0048] Figure 8 FIG. 10 is a simulation schematic diagram of the return loss of the circularly polarized antenna structure 10 of an embodiment. It can be seen from the simulation results that the circularly polarized antenna structure 10 of the present disclosure has good standing wave ratio and radiation characteristics in two frequency bands of L1 (1.164 - 1.218 GHz) and L5 (1.559 - 1.61 GHz), so that the circularly polarized antenna structure 10 can achieve multi-band coverage processing; and it can also be seen from Figure 8 that in the L1 and L5 frequency bands, it meets the requirements of the circularly polarized antenna structure 10, that is, less than -10 dB.

[0049] Figure 9 FIG. 16 is a simulation schematic diagram of the gain of the circularly polarized antenna structure 10 at 1.176 GHz of an embodiment. It can be seen from Figure 9 that the gain of the right-handed circular polarization is 3.21 dBi.

[0050] Figure 10 FIG. 22 is a simulation schematic diagram of the axial ratio beam width of the circularly polarized antenna structure 10 at 1.176 GHz of an embodiment. It can be seen from Figure 10 that the 3 dB beam width exceeds 122°, and the axial ratio at the 0° direction is 1.11 dB.

[0051] Figure 11 Schematic diagram of the gain simulation at 1.575 GHz of the circularly polarized antenna structure 10 of an embodiment. As can be seen from Figure 11 it, the gain of the right-handed circular polarization is 3.46 dBi.

[0052] Figure 12 Schematic diagram of the axial ratio beamwidth simulation at 1.575 GHz of the circularly polarized antenna structure 10 of an embodiment. As can be seen from Figure 12 it, the 3 dB beamwidth exceeds 125°, and the axial ratio is 0.67 dB in the 0° direction.

[0053] For the above circularly polarized antenna structure 10, since each feeding part 122 is electrically connected to the feeding network wire body 121, and the feeding network wire body 121 is respectively used for being electrically connected to a Wilkinson power divider, a Schiffman phase shifter, a first composite left-handed and right-handed transmission line phase shifter, and a second composite left-handed and right-handed transmission line phase shifter to form a feeding network, each feeding branch part 210 is electrically connected to the corresponding feeding part 122 so that each feeding part 122 is electrically connected to the radiation assembly 200, each first coupling part 310 and each second coupling part 320 are both electrically connected to the ground plane layer 110, each first coupling bending part 3111a is perpendicularly coupled to the corresponding radiation bending part 220, and each third coupling bending part 3211 is perpendicularly coupled to the corresponding second coupling bending part 3112a to form a signal transmission path; the Wilkinson power divider is a radio frequency device, the Schiffman phase shifter is used for adjusting the phase of a signal to make the signal achieve a 180° phase shift, and the composite left-handed and right-handed transmission line phase shifter is used for adjusting the phase of a signal to make the signal achieve a 90° phase shift, so that the feeding network generates excitations with equal amplitude and a phase difference of 90°, thereby enabling the circularly polarized antenna structure 10 to meet the circular polarization requirements, enabling the circularly polarized antenna structure 10 to work in different frequency bands, enabling the circularly polarized antenna structure 10 to not only cover the frequency band of the low-frequency part but also cover the frequency band of the high-frequency part, thereby enabling the circularly polarized antenna structure 10 to achieve multi-band coverage processing, and further solving the problem in the prior art that the antenna structure realizes multi-band coverage processing through antenna stacking arrangement;

[0054] Since each feeding part 122 is electrically connected to the feeding network wire body 121, and each feeding stub part 210 is electrically connected to the corresponding feeding part 122, so that each feeding part 122 is electrically connected to the radiation component 200, a plurality of first coupling parts 310 and a plurality of second coupling parts 320 are alternately arranged around the center of the radiation component 200, each first coupling part 310 and each second coupling part 320 are electrically connected to the ground plane layer 110, each first coupling bending part 3111a is perpendicularly coupled to the corresponding radiation bending part 220, and each third coupling bending part 3211 is perpendicularly coupled to the corresponding second coupling bending part 3112a, so that the radiation component 200 and the coupling component 300 are arranged on the same layer, completing the layout setting of the circularly polarized antenna structure 10, thus avoiding the problem of antenna layout in the prior art by using the antenna stacked arrangement method, and further solving the problem of multi-band coverage processing of the antenna structure in the prior art by using the antenna stacked arrangement, so that the layout layer number of the circularly polarized antenna structure 10 is less, the material requirement for manufacturing the circularly polarized antenna structure 10 is smaller, and further the manufacturing cost of the circularly polarized antenna structure 10 is lower.

[0055] In one embodiment, each feeding part 122 is a feeding probe structure, so that each feeding part 122 can improve the radiation efficiency of the circularly polarized antenna structure 10.

[0056] As Figure 1 , Figure 2 and Figure 5 shown, in one embodiment, the radiation component 200 further includes a radiation sheet body 230, each feeding stub part 210 and each radiation bending part 220 are connected to the radiation sheet body 230, and a plurality of feeding stub parts 210 are arranged around the center of the radiation sheet body 230 at intervals, so that the adjacent two feeding stub parts 210 and the radiation sheet body 230 jointly form a connection area 211; a plurality of radiation bending parts 220 are arranged around the center of the radiation sheet body 230 at intervals. In this embodiment, each feeding stub part 210 and each radiation bending part 220 are connected to the radiation sheet body 230 to improve the radiation efficiency of the circularly polarized antenna structure 10.

[0057] In one embodiment, the radiation sheet body 230, the plurality of feeding stub parts 210 and the plurality of radiation bending parts 220 are an integrally formed structure, so that the radiation component 200 has a higher structural strength.

[0058] Further, the radiation sheet body 230, the plurality of feeding stub parts 210 and the plurality of radiation bending parts 220 are an integrally formed sheet metal structure, which simplifies the manufacturing process of the radiation component 200, so that the manufacturing cost of the radiation component 200 is lower, and thus the manufacturing cost of the circularly polarized antenna structure 10 is lower.

[0059] As Figure 1 ,Figure 2 and Figure 6 As shown in Figure 6 , in one embodiment, each first coupling member 310 includes a connected first coupling plate body 311 and a first stub plate body 312. Each first stub plate body 312 is electrically connected to the ground plane layer 110. Each first coupling plate body 311 is provided with a first coupling bending portion 3111a and a second coupling bending portion 3112a oppositely. In this embodiment, each first stub plate body 312 is a short - circuit stub. Each first stub plate body 312 is electrically connected to the ground plane layer 110, so as to introduce a short - circuit structure in the circularly polarized antenna structure 10, which is used to change the input impedance of the circularly polarized antenna structure 10 to improve the standing - wave ratio of the circularly polarized antenna structure 10.

[0060] In one embodiment, each first coupling plate body 311 and the corresponding first stub plate body 312 are of an integrally formed structure, so that the structural strength of each first coupling member 310 is relatively high.

[0061] Furthermore, each first coupling plate body 311 and the corresponding first stub plate body 312 are of an integrally formed sheet - metal structure, so that the manufacturing process of each first coupling member 310 is simplified, the manufacturing cost of each first coupling member 310 is relatively low, and thus the manufacturing cost of the circularly polarized antenna structure 10 is relatively low.

[0062] As Figure 1 、 Figure 2 and Figure 7 As shown in Figure 7 , in one embodiment, each second coupling member 320 includes a connected second coupling plate body 321 and a second stub plate body 322. Each second stub plate body 322 is electrically connected to the ground plane layer 110. Each second coupling plate body 321 is provided with a third coupling bending portion 3211. In this embodiment, each second stub plate body 322 is a short - circuit stub. Each second stub plate body 322 is electrically connected to the ground plane layer 110, so as to introduce a short - circuit structure in the circularly polarized antenna structure 10, which is used to change the input impedance of the circularly polarized antenna structure 10 to improve the standing - wave ratio of the circularly polarized antenna structure 10.

[0063] In one embodiment, each second coupling plate body 321 and the corresponding second stub plate body 322 are of an integrally formed structure, so that the structural strength of each second coupling member 320 is relatively high.

[0064] Furthermore, each second coupling plate body 321 and the corresponding second stub plate body 322 are of an integrally formed sheet - metal structure, so that the manufacturing process of each second coupling member 320 is simplified, the manufacturing cost of each second coupling member 320 is relatively low, and thus the manufacturing cost of the circularly polarized antenna structure 10 is relatively low.

[0065] As Figures 3 to 4As shown, in one embodiment, the feeding substrate layer 120 is further provided with a plurality of connecting columns 123, which are arranged at intervals. Each connecting column 123 is electrically connected to the feeding network wire 121. In this embodiment, each connecting column 123 is a short-circuit metal column structure, and each connecting column 123 is used to change the current distribution of the circularly polarized antenna structure 10, thereby improving the radiation efficiency of the circularly polarized antenna structure 10.

[0066] As Figures 1 to 7 shown, further, in one embodiment, the radiation sheet 230 includes a radiation portion 231 and a plurality of extension portions 232. Each extension portion 232 is connected to the radiation portion 231, and the plurality of extension portions 232 are arranged at intervals around the center of the radiation portion 231; each feeding branch portion 210 is connected to the radiation portion 231, and the plurality of feeding branch portions 210 are arranged at intervals around the center of the radiation portion 231, so that a connection area 211 is jointly formed by two adjacent feeding branch portions 210 and the radiation portion 231; each radiation bending portion 220 is connected to the corresponding extension portion 232. In this embodiment, each feeding branch portion 210 is connected to the radiation portion 231, and each feeding branch portion 210 is used to achieve impedance matching and energy transmission, so as to improve the radiation efficiency of the circularly polarized antenna structure 10.

[0067] Furthermore, in one embodiment, the radiation assembly 200 is in the shape of a windmill, so that the radiation efficiency of the circularly polarized antenna structure 10 is relatively high.

[0068] Further, in one embodiment, each radiation bending portion 220 and the corresponding extension portion 232 are integrally bent and formed structures, which is convenient for the forming of each radiation bending portion 220, simplifies the manufacturing process of the radiation assembly 200, and makes the manufacturing cost of the circularly polarized antenna structure 10 relatively low.

[0069] Further, in one embodiment, each feeding branch portion 210 includes a connecting feeding plate 213 and a branch main body 212 which are connected. Each branch main body 212 is connected to the radiation portion 231, and each connecting feeding plate 213 passes through the corresponding avoidance groove 111 and is electrically connected to the corresponding feeding portion 122, so that the radiation portion 231 is conducted to the plurality of feeding portions 122 through the plurality of feeding branch portions 210, and the radiation efficiency of the circularly polarized antenna structure 10 is relatively high.

[0070] Furthermore, in one embodiment, each connecting feeding plate 213 is provided with a feeding wire (not shown in the figure), and each feeding wire is electrically connected to the corresponding feeding portion 122, so that each connecting feeding plate 213 is electrically connected to the corresponding feeding portion 122, reducing the energy loss between each connecting feeding plate 213 and the corresponding feeding portion 122.

[0071] Further, in one embodiment, each first coupling sheet body 311 includes a connected first coupling portion 3111 and a second coupling portion 3112. The second coupling portion 3112 is connected to the first branch sheet body 312. Each first coupling portion 3111 is provided with a first coupling bending portion 3111a, and each second coupling portion 3112 is provided with a second coupling bending portion 3112a, so that the structure of each first coupling sheet body 311 is compact.

[0072] Furthermore, in one embodiment, each first coupling bending portion 3111a is provided with a first coupling surface 3111b, and each second coupling bending portion 3112a is provided with a second coupling surface 3112b. The extending direction of the first coupling surface 3111b is parallel to the extending direction of the second coupling surface 3112b, so that the radiation efficiency of the circularly polarized antenna structure 10 is relatively high.

[0073] Further, in one embodiment, each first branch sheet body 312 includes a connected first branch portion 3121 and a first welding plate 3122. Each first branch portion 3121 is connected to the corresponding second coupling portion 3112, and each first welding plate 3122 is electrically connected to the ground plane layer 110, which is used to improve the standing wave ratio of the circularly polarized antenna structure 10, so that the radiation efficiency of the circularly polarized antenna structure 10 is relatively high.

[0074] Furthermore, in one embodiment, each first welding plate 3122 is welded to the ground plane layer 110, so that the connection strength between each first welding plate 3122 and the ground plane layer 110 is relatively good.

[0075] Further, in one embodiment, each second branch sheet body 322 includes a connected second branch portion 3221 and a second welding plate 3222. Each second branch portion 3221 is connected to the corresponding second coupling sheet body 321, and each second welding plate 3222 is electrically connected to the ground plane layer 110, which is used to improve the standing wave ratio of the circularly polarized antenna structure 10, so that the radiation efficiency of the circularly polarized antenna structure 10 is relatively high.

[0076] Furthermore, in one embodiment, each second welding plate 3222 is welded to the ground plane layer 110, so that the connection strength between each second welding plate 3222 and the ground plane layer 110 is relatively good.

[0077] The present disclosure also provides a vehicle-mounted satellite navigation system, including the circularly polarized antenna structure 10 of any one of the above embodiments.

[0078] Compared with the prior art, the present disclosure has at least the following advantages:

[0079] 1. Since each feeding part 122 is electrically connected to the feeding network wire body 121, and the feeding network wire body 121 is respectively used to be electrically connected to a Wilkinson power divider, a Schiffman phase shifter, a first composite right - hand and left - hand transmission line phase shifter, and a second composite right - hand and left - hand transmission line phase shifter to form a feeding network, each feeding branch part 210 is electrically connected to the corresponding feeding part 122, so that each feeding part 122 is electrically connected to the radiation component 200. Each first coupling part 310 and each second coupling part 320 are both electrically connected to the ground plane layer 110. Each first coupling bending part 3111a is perpendicularly coupled to the corresponding radiation bending part 220, and each third coupling bending part 3211 is perpendicularly coupled to the corresponding second coupling bending part 3112a to form a signal transmission path. The Wilkinson power divider is a radio - frequency device. The Schiffman phase shifter is used to adjust the phase of the signal to achieve a 180° phase shift of the signal. The composite right - hand and left - hand transmission line phase shifter is used to adjust the phase of the signal to achieve a 90° phase shift of the signal, so that the feeding network generates excitations with equal amplitude and a 90° phase difference, thus enabling the circularly polarized antenna structure 10 to meet the circular polarization requirements, enabling the circularly polarized antenna structure 10 to operate in different frequency bands, enabling the circularly polarized antenna structure 10 to cover not only the frequency band of the low - frequency part but also the frequency band of the high - frequency part, so that the circularly polarized antenna structure 10 can achieve multi - band coverage processing, and further solving the problem in the prior art that the antenna structure realizes multi - band coverage processing through antenna stacking settings;

[0080] 2. Since each feeding part 122 is electrically connected to the feeding network wire body 121, and each feeding branch part 210 is electrically connected to the corresponding feeding part 122, so that each feeding part 122 is electrically connected to the radiation component 200. A plurality of first coupling parts 310 and a plurality of second coupling parts 320 are arranged alternately around the center of the radiation component 200. Each first coupling part 310 and each second coupling part 320 are both electrically connected to the ground plane layer 110. Each first coupling bending part 3111a is perpendicularly coupled to the corresponding radiation bending part 220, and each third coupling bending part 3211 is perpendicularly coupled to the corresponding second coupling bending part 3112a, so that the radiation component 200 and the coupling component 300 are arranged on the same layer, completing the layout setting of the circularly polarized antenna structure 10, thus avoiding the problem in the prior art that the antenna structure uses the antenna stacking setting method for antenna layout, and further solving the problem in the prior art that the antenna structure realizes multi - band coverage processing through antenna stacking settings, so that the layout layer number of the circularly polarized antenna structure 10 is less, the material requirement for manufacturing the circularly polarized antenna structure 10 is smaller, and thus the manufacturing cost of the circularly polarized antenna structure 10 is lower.

[0081] The above-described embodiments merely represent several implementation manners of the present disclosure. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the disclosed patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present disclosure, several modifications and improvements can still be made, and these all fall within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure patent shall be subject to the appended claims.

Claims

1. A circularly polarized antenna structure, characterized in that: include: A feed board body, comprising a connected ground plate layer and a feed substrate layer, wherein the ground plate layer is provided with a plurality of avoidance grooves, and the plurality of avoidance grooves are arranged around and spaced along the center of the ground plate layer; the feed substrate layer is provided with a feed network line body and a plurality of feed parts, each of the feed parts is electrically connected to the feed network line body, and each of the feed parts is located in a corresponding avoidance groove; the feed network line body is respectively used to be electrically connected to a Wilkinson power divider, a Schiffman phase shifter, a first composite left-handed transmission line phase shifter, and a second composite left-handed transmission line phase shifter; A radiation component is provided with a plurality of feeding branches and a plurality of radiation bends, each of the feeding branches is passed through the corresponding avoidance groove and is electrically connected to the corresponding feeding part, and a connection area is formed between two adjacent feeding branches; a plurality of radiation bends are arranged around and spaced along the center of the radiation component, and each of the radiation bends is located in the corresponding connection area; A coupling component includes a plurality of first coupling members and a plurality of second coupling members, wherein the plurality of first coupling members and the plurality of second coupling members are alternately arranged around the center of the radiation component, and each of the first coupling members and each of the second coupling members are electrically connected to the ground plane layer; each of the first coupling members is relatively provided with a first coupling bending portion and a second coupling bending portion, and each of the first coupling bending portions is vertically coupled with the corresponding radiation bending portion; each of the second coupling members is provided with a third coupling bending portion, and each of the third coupling bending portions is vertically coupled with the corresponding second coupling bending portion.

2. The circularly polarized antenna structure according to claim 1, characterized in that: Each of the feeding parts is a feeding probe structure.

3. The circularly polarized antenna structure according to claim 1, characterized in that: The radiation component also includes a radiation sheet, each of the feed branch portions and each of the radiation bend portions are connected to the radiation sheet, and multiple feed branch portions are arranged around the center of the radiation sheet so that two adjacent feed branch portions and the radiation sheet form the connection area together; multiple radiation bend portions are arranged around the center of the radiation sheet.

4. The circularly polarized antenna structure according to claim 3, characterized in that: The radiation sheet, the plurality of feeding branch portions and the plurality of radiation bending portions are an integrally formed structure.

5. The circularly polarized antenna structure according to claim 1, characterized in that: Each of the first coupling members includes a first coupling sheet and a first branch sheet connected to each other. Each of the first branch sheets is electrically connected to the grounding plate layer. Each of the first coupling sheets is provided with the first coupling bending portion and the second coupling bending portion opposite to each other.

6. The circularly polarized antenna structure according to claim 5, characterized in that: Each of the first coupling sheets and the corresponding first branch sheet are an integrally formed structure.

7. The circularly polarized antenna structure according to claim 1, characterized in that: Each of the second coupling members includes a second coupling sheet and a second branch sheet connected to each other. Each of the second branch sheets is electrically connected to the grounding plate layer. Each of the second coupling sheets is provided with the third coupling bending portion.

8. The circularly polarized antenna structure according to claim 7, characterized in that: Each of the second coupling sheets and the corresponding second branch sheet are an integrally formed structure.

9. The circularly polarized antenna structure according to claim 1, characterized in that: The feed substrate layer is also provided with a plurality of connection columns, which are arranged at intervals, and each of the connection columns is electrically connected to the feed network line body.

10. A vehicle-mounted satellite navigation system, characterized in that: The circularly polarized antenna structure comprises the circularly polarized antenna structure described in any one of claims 1 to 9.

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