Beidou antenna

Abstract

The present invention is applied to the technical field of communication antennas, and relates to a Beidou antenna. The antenna comprises: a first antenna array and a second antenna array which are stacked, wherein the first antenna array is in a truncated cone shape, the bottom diameter of the first antenna array is greater than the top diameter of the first antenna array, and the first antenna array comprises a first fixing body and at least one first radiator; each first radiator is clockwise and spirally fixed on the first fixing body; the second antenna array is cylindrical and comprises a second fixing body and at least one second radiator; and each second radiator is anticlockwise and spirally fixed on the second fixing body. By means of the scheme, the first antenna array can receive electromagnetic wave signals of a large-range frequency band, comprising electromagnetic wave signals of a Beidou short message communication frequency band and electromagnetic wave signals of a Beidou navigation positioning frequency band, and the second antenna array can transmit the electromagnetic wave signals of the Beidou short message communication frequency band. In this way, the Beidou antenna in the present scheme simultaneously realizes a Beidou short message communication function and a high-precision navigation positioning function.

Description

A Beidou antenna Technical Field

[0001] The present invention relates to the technical field of communication antennas, and in particular to a Beidou antenna. Background Art

[0002] With the global deployment of BeiDou-3 satellites now complete, higher requirements are being placed on BeiDou antennas, requiring them to simultaneously function as both communication and high-precision navigation and positioning. However, at present, BeiDou antennas designed for high-precision navigation and positioning cannot function as communication antennas, and vice versa.

[0003] In summary, there is a need for a Beidou antenna that can simultaneously realize communication functions and high-precision navigation and positioning functions.

[0004] Summary of the Invention

[0005] The present invention provides a Beidou antenna for simultaneously realizing Beidou short message communication function and high-precision navigation and positioning function.

[0006] In a first aspect, the present invention provides a Beidou antenna, which includes a first antenna array and a second antenna array arranged in a stacked manner, wherein the first antenna array is in a truncated cone shape with a bottom diameter larger than a top diameter, and includes a first fixed body and at least one first radiator, each first radiator being spirally fixed on the first fixed body in a clockwise manner; the second antenna array is in a cylindrical shape, and includes a second fixed body and at least one second radiator, each second radiator being spirally fixed on the second fixed body in a counterclockwise manner.

[0007] In an embodiment of the present invention, the first antenna array can be used to receive electromagnetic wave signals. By setting the first antenna array to a truncated cone shape and fixing the first radiator in the first antenna array clockwise on the first fixed body, the first antenna array can receive electromagnetic wave signals in a larger frequency band, including electromagnetic wave signals in the Beidou short message communication frequency band and electromagnetic wave signals in the Beidou navigation and positioning frequency band; the second antenna array can be used to transmit electromagnetic wave signals in a larger frequency band, including electromagnetic wave signals in the Beidou short message communication frequency band; therefore, in the present invention, the Beidou antenna can receive and transmit electromagnetic wave signals in the Beidou short message communication frequency band, thereby realizing the communication function. In addition, the Beidou antenna can also receive electromagnetic wave signals in the Beidou navigation and positioning frequency band, thereby realizing high-precision navigation and positioning functions.

[0008] In an optional manner, each first radiator is fixed to the first fixed body in a clockwise spiral at a first spiral angle, and the range of the first spiral angle is [30°, 60°], so that the first antenna element can receive right-handed electromagnetic wave signals in a wider frequency band.

[0009] In an optional manner, the width of the starting end of each first radiator is greater than the width of the cutoff end of the first radiator, the width of the starting end of the first radiator ranges from [30 mm, 40 mm], and the width of the cutoff end of the first radiator ranges from [15 mm, 20 mm].

[0010] In the present invention, the width of the first radiator is set to gradually narrow from the starting end, so that the Beidou antenna has a higher frequency band and achieves high gain, effectively improving the transmission efficiency of electromagnetic wave signals.

[0011] In an optional embodiment, the Beidou antenna also includes a first circuit board, which is located at the bottom of the first antenna element; the first circuit board includes a first feeding network, which is connected to the first radiator through a first feeding point and is used to process the first signal received by the first radiator.

[0012] In the embodiment of the present invention, the right-handed electromagnetic wave signal received by the first radiator is processed by the first feeding network.

[0013] In an optional manner, the first antenna array includes N first radiators, where N is an even number, and the N first radiators are arranged sequentially from bottom to top of the first antenna array; the Beidou antenna also includes N first feeding points corresponding one-to-one to the N first radiators, and the signal amplitudes of the N first feeding points are equal, and the phases differ by 90° in a clockwise direction.

[0014] In an embodiment of the present invention, an even number of first feeding points are provided so that the first feeding points can be evenly distributed in an axisymmetric manner, thereby reducing reflection of electromagnetic wave signals in the Beidou antenna.

[0015] In an optional manner, the diameter range of the bottom of the first fixed body is: [80 mm, 110 mm], and the diameter range of the top of the first fixed body is: [30 mm, 40 mm].

[0016] In an embodiment of the present invention, by setting the above parameters, the first antenna element can receive electromagnetic wave signals in a wider frequency band, that is, it can receive electromagnetic wave signals in the Beidou short message communication frequency band as well as electromagnetic wave signals in the Beidou navigation and positioning frequency band, thereby enabling the Beidou antenna to simultaneously realize communication functions and high-precision navigation and positioning functions.

[0017] In an optional manner, each second radiator is fixed to the second fixing body in a counterclockwise spiral at a second spiral angle, and the range of the second spiral angle is [30°, 60°].

[0018] In an optional embodiment, the width of the starting end of each second radiator is greater than or equal to the width of the cutoff end of the second radiator, the width of the starting end of the second radiator is in the range of [3mm, 4mm], and the width of the cutoff end of the second radiator is in the range of [3mm, 4mm].

[0019] In an optional embodiment, the Beidou antenna also includes a second circuit board, which is located at the bottom of the second antenna array; the second circuit board includes a second feeding network, which is connected to the second radiator through a second feeding point, for processing the second signal and forwarding the processed second signal to the second radiator.

[0020] In an optional embodiment, the second antenna array includes M second radiators, where M is an even number, and the M second radiators are arranged sequentially from bottom to top of the second antenna array; the Beidou antenna also includes M second feeding points corresponding one-to-one to the M second radiators, and the signal amplitudes of the M second feeding points are equal, and the phases differ by 90° in a counterclockwise direction.

[0021] In an optional manner, the diameter range of the bottom of the second fixing body is: [25 mm, 30 mm].

[0022] In an optional manner, the Beidou antenna further includes a support column, which is used to fix the first antenna array and the second antenna array and is also used for signal transmission.

[0023] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] FIG1 is a schematic structural diagram of a Beidou antenna provided by an embodiment of the present invention;

[0026] FIG2 is a schematic structural diagram of a first feeding network provided by an embodiment of the present invention;

[0027] FIG3 is a schematic structural diagram of a second feeding network provided by an embodiment of the present invention;

[0028] FIG4 is a schematic structural diagram of a radome provided in an embodiment of the present invention;

[0029] FIG5 is a directional diagram of an electromagnetic wave signal in the Beidou navigation and positioning frequency band received by a Beidou antenna provided by an embodiment of the present invention;

[0030] FIG6 is a directional diagram of an electromagnetic wave signal in the Beidou navigation and positioning frequency band received by a Beidou antenna provided by an embodiment of the present invention;

[0031] FIG7 is a directional diagram of an electromagnetic wave signal received by a Beidou antenna in a Beidou short message communication frequency band according to an embodiment of the present invention;

[0032] FIG8 is a directional diagram of an electromagnetic wave signal transmitted in the Beidou short message communication frequency band by a Beidou antenna provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0033] To make the objectives, technical solutions, and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the embodiments described herein are merely some, not all, of the present invention. Furthermore, all other embodiments derived by persons of ordinary skill in the art based on the embodiments herein without inventive effort are intended to fall within the scope of protection of the present invention.

[0034] It should be noted that the terms "first," "second," and the like in the present invention are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present disclosure described herein can be implemented in an order other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are merely examples of devices and methods consistent with certain aspects of the present invention as detailed in the appended claims.

[0035] As shown in Figure 1, a schematic diagram of the structure of a Beidou antenna provided in an embodiment of the present invention is shown. The Beidou antenna 10 includes a first antenna element 11 and a second antenna element 12 arranged in a stacked manner. The first antenna element 11 is in the shape of a truncated cone with a base diameter larger than a top diameter. It includes a first fixed body 111 and at least one first radiator 112 (four of which are identified in Figure 1). Each first radiator 112 is spirally fixed to the first fixed body 111 in a clockwise manner. The second antenna element 12 is in the shape of a cylinder and includes a second fixed body 121 and at least one second radiator 122 (only one of which is identified in Figure 1). Each second radiator 122 is spirally fixed to the second fixed body 121 in a counterclockwise manner.

[0036] Each component is introduced below.

[0037] The first antenna element 11 is truncated cone-shaped, with a larger diameter at the bottom than at the top. It includes a first fixed body 111 and at least one first radiator 112. The first fixed body 111 can be a flexible printed circuit (FPC), also known as a flexible printed circuit board (FPC), a highly reliable printed circuit board made from a polyimide or polyester film substrate. The first radiator 112 is fixed to the first fixed body 111 in a clockwise spiral and is designed to receive right-handed electromagnetic wave signals. The first radiator 112 can receive electromagnetic wave signals across a wide range of frequency bands, including those in the Beidou short message communication band and the Beidou navigation and positioning band, such as B1 (1575.42±16.368MHz), B2a (1176.45±10.23MHz), B2b (1207.14MHz±10.23MHz), and B3 (1268.52±10.23MHz). The first radiator 112 may be made of metal, alloy, or ceramic, and there is no specific limitation. The number of first radiators 112 may be one or more, and there is no specific limitation. In the example of FIG1 , there are four first radiators 112 .

[0038] The second antenna element 12 is cylindrical and includes a second fixed body 121 and at least one second radiator 122. The second fixed body 121 may be an FPC. The second radiator 122 is fixed to the second fixed body 121 in a counterclockwise spiral and is configured to emit left-handed electromagnetic wave signals. The second radiator 122 can transmit electromagnetic wave signals across a wide frequency range, including the Beidou short message communication frequency band. The material of the second radiator 122 may be metal, alloy, or ceramic, without specific limitation. The number of second radiators 122 may be one or more, without specific limitation. In the example of Figure 1, there are four second radiators 122.

[0039] It should be noted that in the example of Figure 1, the second antenna array 12 is located above the first antenna array 11. In other examples, the first antenna array 11 may be located above the second antenna array 12. The present invention does not specifically limit the relative position of the second antenna array 12 and the first antenna array 11.

[0040] In the above scheme, the Beidou antenna can receive and transmit electromagnetic wave signals in the Beidou short message communication frequency band, thus realizing the communication function. In addition, the Beidou antenna can also receive electromagnetic wave signals in the Beidou navigation and positioning frequency band, thus realizing the high-precision navigation and positioning function, because this scheme can realize both the communication function and the high-precision navigation and positioning function.

[0041] Optionally, the diameter of the bottom of the first fixed body 111 ranges from 80 mm to 110 mm, and the diameter of the top of the first fixed body 111 ranges from 30 mm to 40 mm. The specific values ​​of the diameter of the bottom and top of the first fixed body 111 can be determined through simulation based on the required antenna dimensions and actual performance. In one possible implementation, the diameter of the bottom of the first fixed body 111 is 108 mm, and the diameter of the top of the first fixed body 111 is 38 mm.

[0042] In an embodiment of the present invention, by setting the above parameters (the diameter of the bottom of the first fixed body 111, the diameter of the top of the first fixed body 111, and the height of the first fixed body), the first antenna element can receive electromagnetic wave signals in a wider frequency band, that is, it can receive electromagnetic wave signals in the Beidou short message communication frequency band and electromagnetic wave signals in the Beidou navigation and positioning frequency band, thereby enabling the Beidou antenna to simultaneously realize communication functions and high-precision navigation and positioning functions.

[0043] Optionally, each first radiator 112 is fixed to the first fixed body in a clockwise spiral at a first spiral angle, wherein the first spiral angle ranges from [30° to 60°], thereby enabling the first antenna element 11 to receive right-handed electromagnetic wave signals over a wide frequency range. In one possible implementation, the first spiral angle is 35°.

[0044] Optionally, the width of the starting end of each first radiator 112 is greater than the width of the ending end of the first radiator 112. The width of the starting end of the first radiator 112 ranges from [30 mm, 40 mm], and the width of the ending end of the first radiator 112 ranges from [15 mm, 20 mm]. It should be noted that the starting end of the first radiator 112 is located at the bottom of the side surface of the first fixed body 111, and the ending end of the first radiator 112 is located at the top of the side surface of the first fixed body 111.

[0045] In a possible implementation, the width of the starting end of the first radiator 112 is 38 mm, and the width of the ending end of the first radiator 112 is 16 mm.

[0046] In the present invention, the width of the first radiator 112 is set to gradually narrow from the starting end, so that the Beidou antenna has a higher frequency band and achieves high gain, effectively improving the transmission efficiency of electromagnetic wave signals.

[0047] Continuing with FIG1 , optionally, the first antenna element 11 includes N first radiators 112 , where N is an even number and arranged sequentially from bottom to top of the first antenna element 11 . The Beidou antenna 10 also includes N first feeding points 13 (two of which are identified in FIG1 ) corresponding one-to-one to the N first radiators. The signals at the N first feeding points 13 have equal amplitudes and phases that differ by 90° in a clockwise direction. The N first feeding points 13 are axially symmetrically distributed.

[0048] In the example shown in Figure 1 , the first antenna element 11 includes four first radiators 112 arranged sequentially from bottom to top of the first antenna element 11. The Beidou antenna 10 also includes four first feeding points 13 corresponding to each of the four first radiators. The signals at these four first feeding points 13 have equal amplitudes and phases that differ by 90° in a clockwise direction. The four first feeding points 13 are arranged axially symmetrically.

[0049] In an embodiment of the present invention, an even number of first feeding points are provided so that the first feeding points can be evenly distributed in an axisymmetric manner, thereby reducing reflection of electromagnetic wave signals in the Beidou antenna.

[0050] Please continue to refer to Figure 1. Optionally, the Beidou antenna also includes a first circuit board 14, which is located at the bottom of the first antenna element 11; the first circuit board 14 includes a first feeding network, which is connected to the first radiator 112 through the first feeding point 13, and is used to process the first signal received by the first radiator.

[0051] The thickness of the first circuit board 14 is in the range of [0.9 mm, 2 mm]. The first circuit board 14 may be a printed circuit board (PCB). A printed circuit board is a circuit board manufactured using electronic printing technology and is used to connect and support electronic components. It has advantages such as high stability, high reliability, and ease of maintenance.

[0052] In one example, FIG2 illustrates a schematic structural diagram of a first feeding network provided by an embodiment of the present invention, taking the first antenna element 11 as including four first radiators 112 and the Beidou antenna 10 as including four first feeding points 13 corresponding one-to-one to the four first radiators. The first feeding network includes a first phase shifter, a second phase shifter, a third phase shifter, a 1 / 4λ phase shifter (λ is a wavelength of electromagnetic waves propagating in a vacuum), and a low-noise amplifier module. The first phase shifter can be a 3dB phase shifter, the second phase shifter can be a 3dB phase shifter, and the third phase shifter can be a 3dB phase shifter. The second and third phase shifters divide the electromagnetic wave signals received from the first radiator 112 into a 3-port signal, a 4-port signal, a 5-port signal, and a 6-port signal. The 3-port signal through the 6-port signal have the same amplitude, and the 3-port signal has a 90-degree phase delay compared to the 4-port signal. The 4-port signal has a 90-degree phase delay compared to the 5-port signal, and the 5-port signal has a 90-degree phase delay compared to the 6-port signal. In this embodiment of the present invention, by setting the amplitudes of the various port signals to be the same and the phases to be 90 degrees delayed, the first feeding network can process right-handed electromagnetic wave signals received by the first radiator.

[0053] Specifically, when the first antenna element 11 is operating, in the first feed network, the input signal from the Input 1 port to the first feed network is split into two signals of equal amplitude and a 90° phase difference (the 1-port signal and the 2-port signal). The 1-port signal then passes through a second phase shifter and is split into two signals of equal amplitude and a 90° phase delay (the 3-port signal and the 4-port signal). The 2-port signal passes through a 1 / 4λ phase shifter and then a third phase shifter, splitting it into two signals of equal amplitude and a 90° phase delay (the 5-port signal and the 6-port signal). The amplitudes of the 3-port signal and the 6-port signal are equal, and the phases are sequentially delayed by 90°. The first feed network completes the operation of the Beidou antenna's four feed sources.

[0054] Optionally, the diameter of the bottom of the second fixed body 121 ranges from 25 mm to 30 mm. The specific value of the diameter of the bottom of the second fixed body 121 can be determined through simulation based on the antenna's size requirements and actual performance. In one possible embodiment, the diameter of the bottom of the second fixed body 121 is 28 mm.

[0055] In an embodiment of the present invention, by setting the parameters of the diameter of the bottom of the second fixed body 121, the second antenna array can transmit electromagnetic wave signals in a wider frequency band, including electromagnetic wave signals in the Beidou short message communication frequency band, so that the Beidou antenna can realize the communication function.

[0056] Optionally, each second radiator 122 is fixed to the second fixing body 121 in a counterclockwise spiral at a second spiral angle, and the range of the second spiral angle is [30°, 60°].

[0057] In an embodiment of the present invention, the second radiator is fixed in a counterclockwise spiral at a second spiral angle, so that the second antenna array can emit left-handed electromagnetic wave signals. Since the first antenna array is used to receive right-handed electromagnetic wave signals, the Beidou antenna in the present invention receives right-handed electromagnetic wave signals and emits left-handed electromagnetic wave signals, so that the two signals are transmitted along different polarization directions, respectively, reducing interference between signals and realizing dual polarization of the Beidou antenna.

[0058] Optionally, the width of the starting end of each second radiator 122 is greater than or equal to the width of the ending end of the second radiator 122. The width of the starting end of the second radiator 122 is in the range of [3 mm, 4 mm], and the width of the ending end of the second radiator 122 is in the range of [3 mm, 4 mm]. It should be noted that the starting end of the second radiator 122 is located at the bottom of the side surface of the second fixed body 121, and the ending end of the second radiator 122 is located at the top of the side surface of the second fixed body 121.

[0059] In one possible implementation, the width of the starting end of the first radiator 112 is 4 mm, and the width of the ending end of the first radiator 112 is 3 mm; in another possible implementation, the width of the starting end of the first radiator 112 is 4 mm, and the width of the ending end of the first radiator 112 is 4 mm.

[0060] In the embodiment of the present invention, the width of the second radiator 122 is set to gradually narrow from the starting end, so that the Beidou antenna has a higher frequency band and achieves high gain, effectively improving the transmission efficiency of electromagnetic wave signals.

[0061] Continuing with FIG1 , the second antenna array 12 optionally includes M second radiators 122 , where M is an even number and arranged sequentially from bottom to top of the second antenna array 12 . The Beidou antenna 10 also includes M second feeding points 15 (only one of which is shown in FIG1 ) corresponding one-to-one to each of the M second radiators 122 . The signals at the M second feeding points 15 have equal amplitudes and phases that differ by 90° in a counterclockwise direction. The M second feeding points 15 are axially symmetrically distributed.

[0062] Continuing with reference to FIG1 , optionally, the Beidou antenna further includes a second circuit board 16 , which is located at the bottom of the second antenna array; the second circuit board 16 includes a second feeding network, which is connected to the second radiator 122 through a second feeding point 15 , for processing the second signal and forwarding the processed second signal to the second radiator.

[0063] The thickness of the second circuit board 16 is in the range of [0.9 mm, 2 mm]. The second circuit board 16 may be a printed circuit board. The detailed description of the printed circuit board can be found above and will not be repeated here.

[0064] In one example, the second antenna array 12 includes two second radiators 122, and the Beidou antenna 10 also includes two second feed points 15 corresponding one-to-one with the two second radiators 122. FIG3 shows a schematic diagram of the structure of a second feed network provided by an embodiment of the present invention. The second feed network includes a power amplifier module and a fourth phase shifter. The fourth phase shifter can be a 3dB phase shifter. The second feed network processes the second signal, and the processing process is as follows:

[0065] The second signal input from the Input2 port is divided into two signals (7-port signal and 8-port signal) with equal amplitude and a phase difference of 90° through the fourth phase shifter. The amplitudes of the signals from the 7-port signal to the 8-port signal are equal and the phases differ by 90° respectively. The processed second signal is then forwarded to the second radiator 122.

[0066] Continuing with Figure 1 , the Beidou antenna optionally includes a support column 17 , which is used to secure the first antenna element 11 and the second antenna element 12 and also facilitates signal transmission. Support column 17 may be a semi-rigid cable. A semi-rigid cable is a coaxial transmission line composed of a metal tube, capable of transmitting high-frequency signals. The metal tube is typically made of copper, forming the outer conductor, with a metal wire conductor located in the center.

[0067] Optionally, the Beidou antenna also includes a radome, as shown in Figure 4, which is a schematic diagram of the structure of a radome according to an embodiment of the present invention. The radome surrounds the first and second antenna elements, providing a structural weatherproof enclosure that protects the Beidou antenna and external electronic equipment from external environmental influences such as rain, sunlight, and wind.

[0068] In embodiments of the present invention, the Beidou antenna is capable of optimally receiving and transmitting electromagnetic wave signals. Figure 5 shows a directional pattern of a Beidou antenna receiving electromagnetic wave signals in the Beidou navigation and positioning frequency band. The Beidou antenna receives right-handed electromagnetic wave signals at a frequency of 1.268 GHz, and its antenna gain is 5.1024 dBi. In practical applications, a higher antenna gain indicates better antenna performance. Typically, an antenna with an antenna gain greater than 0.7 dBi can be used. This indicates that the Beidou antenna of the present invention is capable of optimally receiving electromagnetic wave signals.

[0069] Figure 6 shows a directional pattern of a Beidou antenna receiving electromagnetic wave signals in the Beidou navigation and positioning frequency band. The Beidou antenna receives right-handed electromagnetic wave signals at a frequency of 1.576 GHz, and its antenna gain is 5.8678 dBi. It can be concluded that the Beidou antenna of the present invention is capable of receiving electromagnetic wave signals well.

[0070] Figure 7 shows the directional pattern of a Beidou antenna receiving electromagnetic wave signals in the Beidou short message communication frequency band. The Beidou antenna receives right-handed electromagnetic wave signals at a frequency of 2.492 GHz, and its antenna gain is 4.2767 dBi. It can be concluded that the Beidou antenna of the present invention is capable of receiving electromagnetic wave signals well.

[0071] Figure 8 shows the directional pattern of a Beidou antenna transmitting electromagnetic wave signals in the Beidou short message communication frequency band. The Beidou antenna transmits a left-handed electromagnetic wave signal at a frequency of 1.616 GHz, and its antenna gain is 5.8862 dBi. It can be concluded that the Beidou antenna of the present invention is capable of transmitting electromagnetic wave signals preferably.

[0072] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0073] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A Beidou antenna, characterized in that: It includes a first antenna array and a second antenna array which are stacked; The first antenna element is in a truncated cone shape, with a bottom diameter larger than a top diameter, and includes a first fixed body and at least one first radiator, each of the first radiators being spirally fixed on the first fixed body in a clockwise manner; The second antenna element is cylindrical in shape, and includes a second fixed body and at least one second radiator, and each of the second radiators is fixed on the second fixed body in a counterclockwise spiral.

2. The Beidou antenna according to claim 1, characterized in that: Each of the first radiators is fixed on the first fixing body in a clockwise spiral at a first spiral angle, and the range of the first spiral angle is [30°, 60°].

3. The Beidou antenna according to claim 1, characterized in that: The width of the starting end of each of the first radiators is greater than the width of the cutting-off end of the first radiator. The width of the starting end of the first radiator ranges from [30 mm, 40 mm], and the width of the cutting-off end of the first radiator ranges from [15 mm, 20 mm].

4. The Beidou antenna according to claim 1, characterized in that: It also includes a first circuit board, which is located at the bottom of the first antenna element; The first circuit board includes a first feeding network, which is connected to the first radiator through a first feeding point and is used to process a first signal received by the first radiator.

5. The Beidou antenna according to claim 1, characterized in that: The first antenna array includes N first radiators, where N is an even number, and the N first radiators are arranged in sequence from the bottom to the top of the first antenna array; The Beidou antenna also includes N first feeding points corresponding to the N first radiators respectively, and the signal amplitudes of the N first feeding points are equal and the phases differ by 90° in a clockwise direction.

6. The Beidou antenna according to claim 1, characterized in that: The diameter range of the bottom of the first fixing body is: [80mm, 110mm], and the diameter range of the top of the first fixing body is: [30mm, 40mm].

7. The Beidou antenna according to claim 1, characterized in that: Each of the second radiators is fixed on the second fixing body in a counterclockwise spiral at a second spiral angle, and the range of the second spiral angle is [30°, 60°].

8. The Beidou antenna according to claim 1, characterized in that: The width of the starting end of each second radiator is greater than or equal to the width of the cutting-off end of the second radiator, the width of the starting end of the second radiator is in the range of [3mm, 4mm], and the width of the cutting-off end of the second radiator is in the range of [3mm, 4mm].

9. The Beidou antenna according to claim 1, characterized in that: Also includes a second circuit board, wherein the second circuit board is located at the bottom of the second antenna element; The second circuit board includes a second feeding network, which is connected to the second radiator via a second feeding point, and is used for processing a second signal and forwarding the processed second signal to the second radiator.

10. The Beidou antenna according to claim 1, characterized in that: The second antenna array includes M second radiators, where M is an even number, and the M second radiators are arranged in sequence from the bottom to the top of the second antenna array; The Beidou antenna also includes M second feeding points corresponding to the M second radiators respectively, and the signal amplitudes of the M second feeding points are equal and the phases differ by 90° in a counterclockwise direction.

11. The Beidou antenna according to claim 1, characterized in that: The diameter range of the bottom of the second fixing body is: [25mm, 30mm].

12. The Beidou antenna according to claim 1, characterized in that: Also includes support columns, The support column is used to fix the first antenna array and the second antenna array, and is also used for signal transmission.

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