A circularly polarized antenna based on multiple orthogonal coupled radiating elements

Abstract

The present invention discloses a circularly polarized antenna based on multiple orthogonal coupling radiation units, which relates to the technical field of microwave antennas, and includes an antenna floor, a dielectric substrate and a plurality of radiation patches, wherein the dielectric substrate is arranged on the upper surface of the antenna floor, and the size of the dielectric substrate is the same as that of the antenna floor; the radiation patches are rectangular patches, which are alternately arranged on the upper surface of the dielectric substrate in the horizontal and vertical directions; there are gaps between adjacent radiation patches, and the bottom edge of each radiation patch is arranged on a horizontal line parallel to the bottom edge of the dielectric substrate; a feeding hole penetrating the radiation patch, the dielectric substrate and the antenna floor is provided on the first radiation patch arranged in the horizontal direction, and the feeding hole is arranged on the horizontal center line of the first radiation patch arranged in the horizontal direction. The present invention has a simple structure, a small volume, is easy to process, does not require a feeding network, and significantly expands the bandwidth of the circularly polarized antenna.

Description

Technical Field

[0001] The present invention relates to the technical field of microwave antennas, and more specifically, to a circularly polarized antenna based on multiple orthogonal coupled radiation units. Background Art

[0002] With the development of wireless communication technology, circularly polarized antennas have been widely used and have become a key technology for various wireless systems, such as satellite communication, mobile communication, and global navigation satellite system (GNSS). Compared with ordinary microwave antennas, microstrip antennas have the advantages of low cost, small size, thin profile, easy conformality, and easy integration; however, due to the narrow bandwidth of the microstrip antenna itself, the working bandwidth of the circularly polarized microstrip antenna is also very narrow. Therefore, how to obtain a circularly polarized microstrip antenna that can achieve both miniaturization and wide bandwidth has become a popular research direction. At present, the technologies for achieving broadband circular polarization mainly include single feed, dual feed, and multi-feed. Most single-feed circularly polarized antennas have simple structures, but the axial ratio bandwidth and impedance bandwidth are very narrow, which is not suitable for the needs of high data rate communication between modern interactive systems; the dual-feed point type circularly polarized antenna is realized by using a power divider cascaded broadband 90° phase shifter to realize its feeding network. Although this method broadens the antenna impedance and axial ratio bandwidth, the antenna and the feeding network are designed separately, which greatly reduces the overall efficiency of the antenna. The multi-feed point type circularly polarized antenna needs to feed the antenna in different directions, which makes the design of the feeding network difficult and does not significantly broaden the antenna bandwidth.

[0003] The prior art discloses a wide bandwidth beam low profile circularly polarized antenna, which belongs to the field of wireless communication. The antenna includes an antenna radiation component and an antenna feeding component; the antenna radiation component includes a main radiation patch, four coupling patches of the same structure placed around the main radiation patch and an upper dielectric substrate, and the antenna radiation component is used to radiate signals; the antenna feeding component includes a lower dielectric substrate, a power divider printed on the lower surface of the lower dielectric substrate that outputs four equal amplitude and 90° phase difference signals, and four copper pillars that pass through the upper dielectric substrate and the lower dielectric substrate, and the feeding component is used to feed the main radiation patch. Although this application solves the problems of narrow bandwidth, narrow beam, and high profile of existing circularly polarized antennas to a certain extent, it has a complex structure and needs to be configured with a feeding component, which reduces the overall efficiency of the antenna, and does not significantly widen the antenna bandwidth. Summary of the invention

[0004] In order to overcome the defect that the above-mentioned existing circularly polarized antenna cannot have both miniaturization and wide bandwidth, the present invention provides a circularly polarized antenna based on multiple orthogonal coupled radiating units, which has a simple structure, a small size, does not require a feeding network, and greatly expands the bandwidth.

[0005] In order to solve the above technical problems, the technical solution of the present invention is as follows:

[0006] The present invention provides a circular polarization antenna based on multiple orthogonal coupling radiation units, comprising: an antenna floor, a dielectric substrate and a plurality of radiation patches;

[0007] The dielectric substrate is arranged on the upper surface of the antenna floor, and the size of the dielectric substrate is the same as that of the antenna floor;

[0008] The radiation patches are rectangular patches, which are alternately arranged on the upper surface of the dielectric substrate in the horizontal and vertical directions; there are gaps between adjacent radiation patches, and the bottom edge of each radiation patch is arranged on a horizontal line parallel to the bottom edge of the dielectric substrate;

[0009] A feeding hole penetrating the first transversely arranged radiation patch, the dielectric substrate and the antenna floor is provided on the first transversely arranged radiation patch, and the feeding hole is arranged on the horizontal center line of the first transversely arranged radiation patch.

[0010] The present invention arranges a plurality of radiation patches in a horizontal and vertical direction alternately on the upper surface of a dielectric substrate, that is, the odd-numbered radiation patches are arranged in the same direction, the even-numbered radiation patches are arranged in the same direction, and the bottom edge of each radiation patch is arranged on the same horizontal line parallel to the bottom edge of the dielectric substrate; two adjacent radiation patches are perpendicular to each other and have a gap, so as to form an orthogonal coupling relationship; the gap between the radiation patches is the coupling distance, and the smaller the coupling distance, the greater the coupling coefficient between the radiation patches, and the larger the coupling distance, the smaller the coupling coefficient between the radiation patches; the first horizontally arranged radiation patch is provided with a through-hole through the radiation patch The invention relates to a feeding hole of a patch, a dielectric substrate and an antenna floor, wherein the feeding hole is arranged on the horizontal center line of the first laterally arranged radiation patch; a feeding probe is inserted from the feeding hole to generate an electromagnetic field between the antenna floor and the radiation patch, and by changing the coupling distance between the radiation patches, the voltage amplitude ratio of the vertical component to the horizontal component of the signal is made equal to 1, and the signal phase difference is ±90°, so as to obtain a minimum point of the axial ratio frequency response; when the number of the radiation patches is n, n-1 minimum points of the axial ratio frequency response are obtained, and the antenna has a broadband axial ratio response within a 3dB band, thereby realizing the broadband characteristics of the circularly polarized antenna.

[0011] Preferably, the aspect ratio of each of the radiation patches is [1.5, 2.5].

[0012] Preferably, each of the radiation patches has an equal width.

[0013] Preferably, the distance between the horizontal line where the bottom edge of each radiation patch is located and the bottom edge of the dielectric substrate is:

[0014]

[0015] Wherein, l represents the distance between the horizontal line and the bottom edge of the dielectric substrate, and λ represents the operating wavelength.

[0016] Preferably, the gap d between adjacent radiation patches is in the range of: 0 mm <d<5mm。

[0017] Preferably, the gaps between adjacent radiating patches are unequal.

[0018] Preferably, the resonant frequency of each of the radiation patches is the same.

[0019] Preferably, the antenna floor is a metal floor.

[0020] Preferably, the dielectric constant of the dielectric substrate is [2, 5] and the thickness is 0.5 mm-5 mm.

[0021] Preferably, the antenna floor and the dielectric substrate are both rectangular.

[0022] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0023] The circularly polarized antenna based on multiple orthogonal coupling radiating units provided by the present invention sets the dielectric substrate of the same size on the upper surface of the antenna floor, and sets a plurality of radiating patches alternately horizontally and vertically on the upper surface of the dielectric substrate; there is a gap between adjacent radiating patches, and the bottom edge of each radiating patch is set on a horizontal line parallel to the bottom edge of the dielectric substrate; because a plurality of radiating patches are alternately set horizontally and vertically, the adjacent radiating patches are perpendicular to each other, forming an orthogonal coupling relationship; by adjusting the coupling distance between the radiating patches, the coupling coefficient between the radiating patches is changed, so that the voltage amplitude ratio of the two orthogonal signal components is equal to 1, and the phase difference is ±90°, and multiple in-band axis ratio frequency minimum points are obtained, thereby realizing the characteristics of a broadband circularly polarized antenna. The present invention has a simple structure, a small volume, is easy to process, does not need to configure a feeding network, and significantly expands the bandwidth of the circularly polarized antenna. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the structure of a circularly polarized antenna based on multiple orthogonal coupled radiating units described in Example 1.

[0025] Figure 2 This is a schematic diagram of the structure of a circularly polarized antenna based on multiple orthogonal coupled radiating units as described in Example 2.

[0026] Figure 3 This is a schematic diagram of a theoretical curve of the axial ratio frequency response of a circularly polarized antenna that varies with frequency as described in Example 2.

[0027] Figure 4 This is a schematic diagram of the reflection coefficient curve of the circularly polarized antenna that varies with frequency as described in Example 2.

[0028] Figure 5This is a schematic diagram of the actual gain curve of the right-hand circular polarization of the circularly polarized antenna that varies with frequency as described in Example 2.

[0029] Figure 6 This is a schematic diagram of an actual curve of the axial ratio frequency response of the circularly polarized antenna that varies with frequency as described in Example 2.

[0030] Figure 7 It is the two-dimensional polarization pattern of the circularly polarized antenna described in Example 2 at the center frequency of 3.27 GHz.

[0031] Figure 8 This is a schematic diagram of the structure of a circularly polarized antenna based on multiple orthogonally coupled radiating units described in Example 3.

[0032] Fig. 9 This is a schematic diagram of a theoretical curve of the axial ratio frequency response of a circularly polarized antenna that varies with frequency as described in Example 3.

[0033] Fig.10 This is a schematic diagram of the reflection coefficient curve of the circularly polarized antenna that varies with frequency as described in Example 3.

[0034] Fig.11 This is a schematic diagram of the actual gain curve of the right-hand circular polarization of the circularly polarized antenna that varies with frequency as described in Example 3.

[0035] Fig.12 This is a schematic diagram of an actual curve of the axial ratio frequency response of the circularly polarized antenna that varies with frequency as described in Example 3.

[0036] Fig.13 This is the two-dimensional polarization pattern of the circularly polarized antenna described in Example 3 at a center frequency of 3.25 GHz.

[0037] In the figure, 1-antenna floor, 2-dielectric substrate, 3-radiation patch, 4-feeding hole, 31-first radiation patch, 32-second radiation patch, 33-third radiation patch, 34-fourth radiation patch. DETAILED DESCRIPTION

[0038] The drawings are for illustrative purposes only and should not be construed as limiting the present patent;

[0039] In order to better illustrate the present embodiment, some parts in the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product;

[0040] It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0041] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0042] Example 1

[0043] This embodiment provides a circularly polarized antenna based on multiple orthogonal coupled radiating elements, such as Figure 1 As shown, it includes: an antenna floor 1, a dielectric substrate 2 and a plurality of radiation patches 3;

[0044] The dielectric substrate 2 is arranged on the upper surface of the antenna floor 1, and the size of the dielectric substrate 2 is the same as that of the antenna floor 1;

[0045] The radiation patches 3 are rectangular patches, which are alternately arranged on the upper surface of the dielectric substrate 2 in the horizontal and vertical directions; there is a gap between adjacent radiation patches 3, and the bottom edge of each radiation patch 3 is arranged on a horizontal line parallel to the bottom edge of the dielectric substrate 2;

[0046] A feeding hole 4 penetrating the first laterally arranged radiation patch 3 is provided on the radiation patch, the dielectric substrate 2 and the antenna floor 1 , and the feeding hole is arranged on the horizontal center line of the first laterally arranged radiation patch 3 .

[0047] In the specific implementation process, the present embodiment arranges a plurality of radiation patches 3 alternately in the horizontal and vertical directions on the upper surface of the dielectric substrate 2, that is, the odd-numbered radiation patches 3 are arranged in the same direction, and the even-numbered radiation patches 3 are arranged in the same direction, and the bottom edge of each radiation patch 3 is arranged on the same horizontal line parallel to the bottom edge of the dielectric substrate 2; two adjacent radiation patches 3 are perpendicular to each other and leave a gap to form an orthogonal coupling relationship; the gap between the radiation patches 3 is the coupling distance, and the smaller the coupling distance, the greater the coupling coefficient between the radiation patches, and the larger the coupling distance, the smaller the coupling coefficient between the radiation patches; a feeding probe is inserted from the feeding hole to generate an electromagnetic field between the antenna floor and the radiation patch, and by changing the coupling distance between the radiation patches, the voltage amplitude ratio of the vertical component to the horizontal component of the signal is equal to 1, and the signal phase difference is ±90°, so as to obtain the minimum point of the axial ratio frequency response; n radiation patches can obtain n-1 minimum points of the axial ratio frequency response, with a broadband axial ratio response within the 3dB band, realizing the broadband characteristics of the circularly polarized antenna.

[0048] Example 2

[0049] This embodiment provides a circularly polarized antenna based on multiple orthogonal coupled radiating elements, such as Figure 2 As shown, it includes: an antenna floor 1, a dielectric substrate 2 and a plurality of radiation patches 3;

[0050] The dielectric substrate 2 is arranged on the upper surface of the antenna floor 1, and the size of the dielectric substrate 2 is the same as that of the antenna floor 1;

[0051] The radiation patches 3 are rectangular patches, which are alternately arranged on the upper surface of the dielectric substrate 2 in the horizontal and vertical directions; there is a gap between adjacent radiation patches 3, and the bottom edge of each radiation patch 3 is arranged on a horizontal line parallel to the bottom edge of the dielectric substrate 2;

[0052] A feeding hole 4 penetrating the first laterally arranged radiation patch 3 is provided on the radiation patch, the dielectric substrate 2 and the antenna floor 1 , and the feeding hole is arranged on the horizontal center line of the first laterally arranged radiation patch 3 .

[0053] The aspect ratio of each of the radiation patches 3 is [1.5, 2.5], and the widths are equal;

[0054] The distance between the horizontal line where the bottom edge of each radiation patch 3 is located and the bottom edge of the dielectric substrate 2 is:

[0055]

[0056] Wherein, l represents the distance between the horizontal line and the bottom edge of the dielectric substrate, and λ represents the operating wavelength.

[0057] The gaps between adjacent radiation patches 3 are not equal, and the value range of the gap d is: 0mm <d<5mm;

[0058] The resonant frequency of each of the radiation patches 3 is the same, and the resonant frequency is the same as the center frequency of the circularly polarized antenna. The radiation patch 3 is equivalent to a parallel resonator of conductance, inductance and capacitance near the resonant frequency.

[0059] The antenna floor 1 and the dielectric substrate 2 are both rectangular. The antenna floor 1 is a metal floor. The dielectric constant of the dielectric substrate 2 is [2, 5] and the thickness is 0.5 mm-5 mm.

[0060] In the specific implementation process, this embodiment uses three radiation patches with the same resonant frequency, namely the first radiation patch 31, the second radiation patch 32 and the third radiation patch 33; the antenna floor 1 and the radiation patch are both conductive metals, the first radiation patch 31 and the third radiation patch 33 are arranged horizontally, and the second radiation patch 32 is arranged vertically. The bottom edges of the three radiation patches are located on the same horizontal line, and the distance between the horizontal line and the bottom edge of the dielectric substrate 2 is A feeding hole 4 is provided on the horizontal midline of the first radiation patch 31, which passes through the first radiation patch 31, the dielectric substrate 2 and the antenna floor 1. A feeding probe is inserted from the feeding hole 4 to generate an electromagnetic field between the antenna floor 1 and the radiation patch. The three radiation patches are all rectangular patches with aspect ratios of 1.9, 2, and 2.1, respectively, and the same width. The gap d1 between the first radiation patch 31 and the second radiation patch 32 is different from the gap d2 between the second radiation patch 32 and the third radiation patch 33. In this embodiment, the first radiation patch 31 is The gap d1 between the radiating patch 31 and the second radiating patch 32 is smaller than the gap d2 between the second radiating patch 32 and the third radiating patch 33, so the coupling degree between the first radiating patch 31 and the second radiating patch 32 is stronger, and the values ​​of the three gaps are all between 0 mm and 5 mm; the gaps d1 and d2 are further adjusted to make the voltage amplitude ratio of the vertical component to the horizontal component of the signal equal to 1, the phase difference is ±90°, and the number of radiating patches is n=3, at this time, two axis ratio response minimum points are generated in the working frequency band; Figure 3 As shown in FIG. 1 , the theoretical curve of the axial ratio frequency response of this embodiment with frequency changes is shown. It can be seen that within the axial ratio response 3dB frequency band, two axial ratio response minimum points are generated at the frequency point when the signal is orthogonal, and a hump waveform is formed between the two minimum points. Figure 4 As shown in FIG. 1 , the reflection coefficient curve of this embodiment varies with frequency. It can be seen from the figure that in the 3.14-3.42 GHz frequency band, the reflection coefficient is lower than -10 dB, and the corresponding relative bandwidth is 8.61%. Figure 5 As shown in FIG. 1 , the actual gain curve of right-hand circular polarization varying with frequency in this embodiment is shown, and the maximum gain is 8.54 dBi; wherein the frequency band corresponding to the 3 dB gain is 3.09-3.56 GHz; Figure 6 As shown in FIG. 1 , the actual frequency response curve of the axial ratio of this embodiment with the change of frequency is shown. The frequency band corresponding to the 3dB axial ratio is 3.20-3.34GHz. There are two axial ratio minimum points in this frequency band, which are 3.23GHz and 3.31GHz. A hump waveform is formed between these two minimum points. The corresponding relative bandwidth is 4.12%, which has a broadband axial ratio characteristic. Figure 7 As shown, it is the two-dimensional polarization pattern of this embodiment at the center frequency of 3.27GHz, including the xoz plane and the yoz plane. The solid line in the figure is the right-hand circular polarization component, the dotted line is the left-hand circular polarization component, the maximum radiation direction is the direction of the vertical circular polarization antenna surface, and the circular polarization antenna is mainly right-hand circular polarization. In summary, this embodiment uses three radiating patches with the same resonant frequency, and the vertical component and the horizontal component of the excitation signal are orthogonalized to obtain two minimum points within the 3dB axial ratio frequency response, thereby realizing the broadband characteristics of the circularly polarized antenna.

[0061] Example 3

[0062] This embodiment provides a circularly polarized antenna based on multiple orthogonal coupled radiating elements, such as Figure 8 As shown, it includes: an antenna floor 1, a dielectric substrate 2 and a plurality of radiation patches 3;

[0063] The dielectric substrate 2 is arranged on the upper surface of the antenna floor 1, and the size of the dielectric substrate 2 is the same as that of the antenna floor 1;

[0064] The radiation patches 3 are rectangular patches, which are alternately arranged on the upper surface of the dielectric substrate 2 in the horizontal and vertical directions; there is a gap between adjacent radiation patches 3, and the bottom edge of each radiation patch 3 is arranged on a horizontal line parallel to the bottom edge of the dielectric substrate 2;

[0065] A feeding hole 4 penetrating the first laterally arranged radiation patch 3 is provided on the radiation patch, the dielectric substrate 2 and the antenna floor 1 , and the feeding hole is arranged on the horizontal center line of the first laterally arranged radiation patch 3 .

[0066] The aspect ratio of each of the radiation patches 3 is [1.5, 2.5], and the widths are equal;

[0067] The distance between the horizontal line where the bottom edge of each radiation patch 3 is located and the bottom edge of the dielectric substrate 2 is:

[0068]

[0069] Wherein, l represents the distance between the horizontal line and the bottom edge of the dielectric substrate, and λ represents the operating wavelength.

[0070] The gaps between adjacent radiation patches 3 are not equal, and the value range of the gap d is: 0mm <d<5mm;

[0071] The resonant frequency of each of the radiation patches 3 is the same, and the resonant frequency is the same as the center frequency of the circularly polarized antenna. The radiation patch 3 is equivalent to a parallel resonator of conductance, inductance and capacitance near the resonant frequency.

[0072] The antenna floor 1 and the dielectric substrate 2 are both rectangular. The antenna floor 1 is a metal floor. The dielectric constant of the dielectric substrate 2 is [2, 5] and the thickness is 0.5 mm-5 mm.

[0073] In the specific implementation process, this embodiment uses four radiation patches with the same resonant frequency, namely the first radiation patch 31, the second radiation patch 32, the third radiation patch 33 and the fourth radiation patch 34; the antenna floor 1 and the radiation patch are both conductive metals, the first radiation patch 31 and the third radiation patch 33 are arranged horizontally, the second radiation patch 32 and the fourth radiation patch 34 are arranged vertically, and the bottom edges of the four radiation patches are located on the same horizontal line, and the distance between the horizontal line and the bottom edge of the dielectric substrate 2 is A feeding hole 4 that penetrates through the first radiation patch 31, the dielectric substrate 2, and the antenna floor 1 is provided on the horizontal center line of the first radiation patch 31. A feeding probe is inserted through the feeding hole 4 to generate an electromagnetic field between the antenna floor 1 and the radiation patch. The four radiation patches are all rectangular patches, with aspect ratios of 1.8, 1.9, 2, and 2.1 respectively, and the same width. The gaps d1 between the first radiation patch 31 and the second radiation patch 32, the gap d2 between the second radiation patch 32 and the third radiation patch 33, and the gap d3 between the third radiation patch 33 and the fourth radiation patch 34 are all different. In this embodiment, the three gaps satisfy d1 < d2 < d3. Therefore, the coupling degree between the first radiation patch 31 and the second radiation patch 32 is stronger, and the values of the three gaps are all within 0 mm - 5 mm. Further adjust the gaps d1, d2, d3 so that the voltage amplitude ratio of the vertical component to the horizontal component of the signal is equal to 1, and the phase difference is ±90°. When the number of radiation patches is n = 4, three axial ratio response minimum points are generated within the working frequency band; as Fig. 9 shown, it is the theoretical curve of the axial ratio frequency response changing with frequency in this embodiment. It can be seen that within the 3 dB frequency band of the axial ratio response, three axial ratio response minimum points are generated at the frequency points when the signals are orthogonal, and a hump waveform is formed between two adjacent minimum points, with a total of two hump waveforms formed; as Fig.10 shown, it is the reflection coefficient curve changing with frequency in this embodiment. It can be seen from the figure that within the frequency band of 3.10 - 3.45 GHz, the reflection coefficient is lower than -10 dB, and the corresponding relative bandwidth is 10.64%; as Fig.11 shown, it is the actual right - hand circular polarization gain curve changing with frequency in this embodiment, and the maximum gain is 8.80 dBi; among them, the frequency band corresponding to the 3 dB gain is 3.04 - 3.56 GHz; as Fig.12 shown, it is the actual curve of the axial ratio frequency response changing with frequency in this embodiment. The frequency band corresponding to the 3 dB axial ratio is 3.15 - 3.36 GHz. There are three axial ratio minimum points within this frequency band, which are at 3.18 GHz, 3.25 GHz, and 3.33 GHz respectively. A hump waveform is formed between two adjacent minimum points, and two continuous hump waveforms are formed within the 3 dB frequency band. The corresponding relative bandwidth is 6.21%, which is wider than the bandwidth of the circular polarization antenna in Embodiment 2; as Fig.13 shown, it is the two - dimensional polarization pattern of this embodiment at the center frequency of 3.25 GHz, including the xoz plane and the yoz plane. The solid line in the figure is the right - hand circular polarization component, and the dashed line is the left - hand circular polarization component. The maximum radiation direction is perpendicular to the surface direction of the circular polarization antenna, and the circular polarization antenna is mainly right - hand circular polarization. In summary, this embodiment uses four radiation patches with the same resonant frequency to orthogonalize the vertical component and the horizontal component of the excitation signal, obtaining three minimum points within the 3 dB axial ratio frequency response, and further expanding the bandwidth of the circular polarization antenna.

[0074] The same or similar reference numerals correspond to the same or similar components;

[0075] The terms used in the drawings to describe positional relationships are only used for illustrative purposes and should not be construed as limiting this patent;

[0076] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A circularly polarized antenna based on multiple orthogonally coupled radiating elements, characterized in that: include: Antenna floor (1), dielectric substrate (2) and a plurality of radiation patches (3); The dielectric substrate (2) is arranged on the upper surface of the antenna floor (1), and the size of the dielectric substrate (2) is the same as that of the antenna floor (1); The radiation patches (3) are rectangular patches, and are alternately arranged horizontally and vertically on the upper surface of the dielectric substrate (2); there is a gap between adjacent radiation patches (3), and the bottom edge of each radiation patch (3) is arranged on the same horizontal line parallel to the bottom edge of the dielectric substrate (2); A feeding hole (4) penetrating the radiation patch, the dielectric substrate (2) and the antenna floor (1) is provided on the first radiation patch (3) disposed laterally, and the feeding hole (4) is disposed on the horizontal center line of the first radiation patch (3) disposed laterally; Two adjacent radiation patches (3) are perpendicular to each other and have a gap therebetween, forming an orthogonal coupling relationship; the gap between the radiation patches (3) is the coupling distance, and the smaller the coupling distance, the greater the coupling coefficient between the radiation patches (3), and the larger the coupling distance, the smaller the coupling coefficient between the radiation patches (3); a feeding probe is inserted from the feeding hole (4) to generate an electromagnetic field between the antenna floor (1) and the radiation patch (3), and by changing the coupling distance between the radiation patches (3), the voltage amplitude ratio of the vertical component to the horizontal component of the signal is equal to 1, and the signal phase difference is ±90°, thereby obtaining a minimum value point of the axial ratio frequency response; The aspect ratio of each of the radiation patches (3) is [1.5, 2.5]; The width of each of the radiation patches (3) is equal; The distance between the horizontal line where the bottom edge of each radiation patch (3) is located and the bottom edge of the dielectric substrate (2) is: Where l represents the distance between the horizontal line and the bottom edge of the dielectric substrate, and λ represents the operating wavelength; The value range of the gap d between adjacent radiation patches (3) is: 0mm <d<5mm; The gaps between adjacent radiation patches (3) are not equal; The resonance frequency of each of the radiation patches (3) is the same.

2. The circularly polarized antenna based on multiple orthogonal coupled radiating elements according to claim 1, characterized in that: The antenna floor (1) is a metal floor.

3. The circularly polarized antenna based on multiple orthogonal coupled radiating elements according to claim 1, characterized in that: The dielectric constant of the dielectric substrate (2) is [2, 5] and the thickness is 0.5 mm-5 mm.

4. The circularly polarized antenna based on multiple orthogonal coupled radiating elements according to claim 1, characterized in that: The antenna floor (1) and the dielectric substrate (2) are both rectangular.

Images