A dual-band dual-circularly polarized antenna

Abstract

This application belongs to the field of antenna technology and relates to a dual-band dual-circular polarization antenna, comprising: a radiating layer, a first dielectric layer, an air layer, a ground layer, a second dielectric layer, and a feed layer; the radiating layer includes: a radiating patch and a first annular slot and a second annular slot spaced apart; the centers of the radiating patch, the first annular slot, and the second annular slot coincide; notches are provided on the first and second annular slots corresponding to the diagonal positions of the radiating patch, and both the first and second annular slots form a non-closed square annular structure; two feed probes are provided on each diagonal of the radiating patch, one end of the four feed probes is connected to the feed layer, and the other end is connected to the radiating layer; the feed probes are used as feed ports, and two adjacent feed ports form a group, with the excitation phase of each group of feed ports differing by 90 degrees and the excitation amplitude being the same. This application can realize dual-band dual-circular polarization.

Description

Technical Field

[0001] This application relates to the field of antenna technology, and in particular to a dual-band dual-circularly polarized antenna. Background Technology

[0002] Circularly polarized antennas are widely used in satellite communications, Global Navigation Satellite Systems (GNSS, such as GPS, BeiDou, and GLONASS), and mobile wireless communications due to their ability to suppress rain and fog interference, reduce multipath reflection effects, and lower polarization alignment requirements between transmitting and receiving antennas. As modern wireless communication systems evolve towards integration and multi-mode operation, terminal devices urgently require antennas with multi-band operation capabilities and flexible polarization switching capabilities, particularly achieving dual-band dual-circular polarization radiation characteristics where each band exhibits different rotation directions (left-hand circular polarization LHCP and right-hand circular polarization RHCP).

[0003] In the existing technology, the design of dual-band dual-circular polarized antennas is mostly achieved through techniques such as excitation of multiple resonant modes in patch antennas, combination of different radiation structures, and combination of different types of antennas.

[0004] However, the above methods have problems that cannot be ignored:

[0005] 1. Using multiple resonant modes to achieve dual-band dual circular polarization has the limitation that the dual frequencies and polarization modes are difficult to control independently.

[0006] 2. Using different combinations of radiation structures to achieve dual-band dual circular polarization has the limitation of very narrow bandwidth, and it can basically only have circular polarization radiation performance at the resonant frequency.

[0007] 3. Using a combination of different types of antennas (e.g., a combination of patch antennas and dielectric resonator antennas) to achieve dual-band dual circular polarization has the limitation of complex mode control of dielectric resonator antennas, and requires high processing precision.

[0008] In addition, most current dual-band dual-circular polarization antenna designs do not have the ability to switch circular polarization. Summary of the Invention

[0009] Therefore, it is necessary to provide a dual-band dual-circular polarization antenna that can achieve dual-band dual-circular polarization lateral radiation to address the above-mentioned technical problems.

[0010] A dual-band dual-circularly polarized antenna includes, from top to bottom, the following layers stacked in sequence: a radiating layer, a first dielectric layer, an air layer, a ground layer, a second dielectric layer, and a feed layer; The radiation layer includes: a square radiation patch and a first annular groove and a second annular groove disposed on the radiation patch and spaced apart; the centers of the radiation patch, the first annular groove and the second annular groove coincide; the first annular groove and the second annular groove are provided with notches at positions corresponding to the diagonal of the radiation patch, so that the first annular groove and the second annular groove both form a non-closed square annular structure. Two feed probes are provided on each diagonal of the radiation patch. One end of each of the four feed probes is connected to the feed layer, and the other end passes through the second dielectric layer, the floor layer, the air layer and the first dielectric layer in sequence before being connected to the radiation layer. Using a feeding probe as the feeding port, two adjacent feeding ports are grouped together, with the excitation phase of each group of feeding ports differing by 90 degrees and the excitation amplitude being the same.

[0011] In one embodiment, the radiation patch is further provided with four "I"-shaped grooves; One corresponding end of each of the four "I"-shaped slots is located at the center of the radiating patch, and the other corresponding end is connected to the midpoint of the four sides of the radiating patch, so that the four "I"-shaped slots form a cross-shaped structure. The width of the "I"-shaped groove is variable to adjust the bandwidth, resonant position, and resonant depth.

[0012] In one embodiment, the radiation patch is further provided with a square groove at its center; The side length of the square slot is greater than the width of the "I"-shaped slot, and the side length of the square slot is variable to adjust the impedance matching of the dual-band.

[0013] In one embodiment, the distance between the first annular groove and the center of the radiating patch is greater than the distance between the second annular groove and the center of the radiating patch; The first annular groove includes four first strips, and the second annular groove includes four second strips; Both the first strip and the second strip are strip structures of equal width; The length of the first strip is greater than the length of the second strip, and the width of the first strip is less than the width of the second strip.

[0014] In one embodiment, both the first strip and the second strip are symmetrical trapezoidal structures.

[0015] In one embodiment, the waist of the symmetrical trapezoidal structure is arranged parallel to the diagonal of the radiating patch.

[0016] In one embodiment, four I-shaped slots divide the radiating patch into four quadrants, and four feed probes are respectively disposed in the four quadrants, and the four feed probes are rotationally symmetrical about the center of the radiating patch. The distance between the feed probe and the center of the radiating patch is variable to adjust the impedance matching and resonant frequency of the dual-band circuit.

[0017] In one embodiment, the four power supply probes correspond to the first port, the second port, the third port, and the fourth port, which are sequentially adjacent to each other. The excitation phases of the first and second ports differ by 90 degrees and the excitation amplitudes are the same, so as to achieve one type of circular polarization radiation in one frequency band; at the same time, the excitation phases of the third and fourth ports differ by 90 degrees and the excitation amplitudes are the same, so as to achieve another type of circular polarization radiation in another frequency band.

[0018] In one embodiment, the phase of the first port leads the phase of the second port by 90 degrees to achieve left-handed circular polarization in the low-frequency band, while the phase of the fourth port leads the phase of the third port by 90 degrees to achieve right-handed circular polarization in the high-frequency band. The phase of the first port leads the phase of the second port by 90 degrees, achieving left-handed circular polarization in the high-frequency band. At the same time, the phase of the fourth port leads the phase of the third port by 90 degrees, achieving right-handed circular polarization in the low-frequency band. The phase of the first port lags behind the second port by 90 degrees to achieve right-handed circular polarization in the low-frequency band. At the same time, the phase of the fourth port lags behind the third port by 90 degrees to achieve left-handed circular polarization in the high-frequency band. The phase of the first port lags behind the second port by 90 degrees to achieve right-handed circular polarization in the high-frequency band. At the same time, the phase of the fourth port lags behind the third port by 90 degrees to achieve left-handed circular polarization in the low-frequency band.

[0019] In one embodiment, the ratio of the side length of the radiating patch to the side length of the first dielectric layer satisfies [3:10, 3:4] to improve antenna gain.

[0020] The aforementioned dual-band dual-circular polarization antenna features a first and a second annular slot, capable of generating low-frequency and high-frequency bands. Each band has two resonant modes, and both bands can be independently controlled. The radiation patterns of all four resonant modes are lateral, achieving lateral radiation and improving bandwidth. Four feed probes are also designed, with corresponding ports divided into two groups. One group of ports has a 90-degree phase difference and the same amplitude to achieve one type of circular polarization radiation in one band. Simultaneously, the other group of ports has a 90-degree phase difference and the same amplitude to achieve another type of circular polarization radiation in another band. The two circular polarizations can be switched and independently controlled. The high-to-low frequency ratio of the antenna is 5 / 4 = 1.25 < 1.3, achieving a small frequency ratio. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of a dual-band dual-circularly polarized antenna in one embodiment; Figure 2 This is a dimensional diagram of a dual-band dual-circularly polarized antenna in one embodiment; Figure 3 A simulation diagram of the port reflection coefficient of a dual-band dual-circularly polarized antenna in one embodiment; Figure 4 This is a simulation diagram of the circular polarization gain of a dual-band dual-circular polarization antenna in one embodiment.

[0022] Figure label: Radiation layer 1, radiation patch 11, first annular groove 12, second annular groove 13, "I" shaped groove 14, square groove 15; First dielectric layer 2; Air layer 3; Floor layer 4, isolation hole 41; Second dielectric layer 5; Feed layer 6; Feed probe 7; First port A, second port B, third port C, fourth port D. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0024] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0025] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. In the description of this application, "multiple sets" means at least two sets, such as two sets, three sets, etc., unless otherwise explicitly specified.

[0026] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection, an electrical connection, a physical connection, or a wireless communication connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0027] Furthermore, the technical solutions of the various embodiments of this application can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this application.

[0028] This application provides a dual-band dual-circularly polarized antenna, such as... Figure 1 As shown, in one embodiment, it includes: a radiating layer, a first dielectric layer, an air layer, a ground layer, a second dielectric layer, a feed layer, and a feed probe; wherein the radiating layer, the first dielectric layer, the air layer, the ground layer, the second dielectric layer, and the feed layer are stacked sequentially from top to bottom.

[0029] The radiation layer includes: a radiation patch, a first annular groove, a second annular groove, an "I"-shaped groove, and a square groove; the first annular groove, the second annular groove, the "I"-shaped groove, and the square groove are all located on the radiation patch, and their centers coincide with the center of the radiation patch.

[0030] The radiating patch has a square structure and is located at the center of the first dielectric layer. Two feed probes are provided on each diagonal of the radiating patch.

[0031] The first annular groove generates a low-frequency band with two resonant modes. As the groove width increases, the impedance matching of the low-frequency band improves, and the bandwidth increases. At the same time, the high-frequency band shifts to even lower frequencies. The second annular groove generates a high-frequency band with two resonant modes. As the groove width increases, the impedance matching of the high-frequency band improves, and the bandwidth increases. At the same time, the low-frequency band shifts to even lower frequencies. Notches are provided on the first and second annular grooves at the diagonal positions corresponding to the radiating patches, so that both the first and second annular grooves form non-closed square annular structures.

[0032] There are four "I"-shaped slots. One corresponding end of each of the four "I"-shaped slots is located at the center of the radiating patch, and the other corresponding end is connected to the midpoint of the four sides of the radiating patch, so that the four "I"-shaped slots form a cross shape. The width of the "I"-shaped slots is variable to adjust the bandwidth, resonant position and resonant depth (when the width of the "I"-shaped slots increases, the bandwidth can be increased and the resonant depth can be increased).

[0033] The side length of the square slot is greater than the width of the "I" shaped slot, and the side length of the square slot is variable to adjust the impedance matching of the dual frequency bands (when the side length of the square slot is increased, better impedance matching of the high frequency band can be achieved, and both frequency bands are shifted to higher frequencies).

[0034] Preferably, the distance between the center of the first annular groove and the center of the radiating patch is greater than the distance between the center of the second annular groove and the center of the radiating patch, that is, the first annular groove is spaced out on the outside of the second annular groove; the first annular groove includes four first strips, and the second annular groove includes four second strips; the first strips and the second strips are both strip structures of equal width; the length of the first strip is greater than the length of the second strip, and the width of the first strip is less than the width of the second strip.

[0035] More preferably, both the first and second stripes are symmetrical trapezoidal structures to improve the bandwidth of the low-frequency and high-frequency bands and optimize impedance matching.

[0036] More preferably, the waist of the symmetrical trapezoidal structure is arranged parallel to the diagonal spacing of the radiating patch to further improve the bandwidth of the low-frequency and high-frequency bands, further optimize impedance matching, and improve the circular polarization gain.

[0037] More preferably, the distance between the first strip and the edge of the radiation layer is smaller than the distance between the first strip and the second strip, so that the coupling between all the first strips realizes the dual resonant mode in the low frequency band, and the coupling between the second strips realizes the dual resonant mode in the high frequency band, thereby improving the bandwidth of the excitation of the dual resonant mode in both the low frequency and high frequency bands.

[0038] More preferably, the ratio of the width of the first band to the width of the second band is 5:7, so as to improve the impedance matching of the dual-band and reduce the frequency ratio, thereby achieving a low-frequency-ratio dual-band.

[0039] More preferably, the distance between the first strip and the second strip is equal to one-tenth of the length of the second strip, so as to achieve tight coupling between the first annular groove and the second annular groove, avoid high-frequency movement, and further reduce the frequency ratio.

[0040] More preferably, the ratio of the side length of the radiating patch to the side length of the first dielectric layer satisfies [3:10, 3:4] to improve the antenna gain.

[0041] More preferably, the ratio of the side length of the radiating patch to the side length of the floor layer is less than 3:10 to ensure the bandwidth of the high-frequency band.

[0042] The first dielectric layer serves as a support layer, providing loading space for the radiation layer.

[0043] The setup of the air layer is existing technology and will not be elaborated here. The thickness of the air layer is adjusted to regulate the impedance matching of the dual-band system.

[0044] The floor layer is a full-coverage floor (that is, the shape and size of the floor layer are exactly the same as the second dielectric layer), or the side length of the floor layer is smaller than the side length of the second dielectric layer; a through hole is provided on the floor corresponding to the position of the power supply probe, and the diameter of the through hole is larger than the diameter of the power supply probe, so as to serve as an isolation hole to achieve isolation and avoid power supply short circuit.

[0045] The second dielectric layer serves as a support layer, providing loading space for the floor layer and the power supply layer.

[0046] The feed layer is connected to an external excitation source to receive radio frequency signals, which are then transmitted to the radiating layer by the feed probe. The specific feed layer is existing technology; for example, it could be a microstrip line.

[0047] The feed probe is a metal pillar structure, with one end connected to the feed layer and the other end passing through the second dielectric layer, the ground layer, the air layer and the first dielectric layer in sequence before connecting to the radiation layer. The feed probe is used as the feed port, and two adjacent feed ports are grouped together. The excitation phase of each group of feed ports differs by 90 degrees and the excitation amplitude is the same.

[0048] Preferably, four I-shaped slots divide the radiating patch into four quadrants, and four feed probes are respectively located in the four quadrants, with the four feed probes being rotationally symmetrical about the center of the radiating patch; the distance between the feed probes and the center of the radiating patch is variable to adjust the impedance matching and resonant frequency of the dual-band (when the distance between the feed probes and the center of the radiating patch decreases, i.e., when the feed probes move inward along the diagonal, better high-frequency impedance matching and a better low-frequency resonant frequency can be achieved).

[0049] In this embodiment, the four feed probes correspond to the first port, the second port, the third port, and the fourth port in sequence. The excitation phases of the first port and the second port are 90 degrees apart and the excitation amplitudes are the same, so as to achieve one type of circular polarization radiation in one frequency band. At the same time, the excitation phases of the third port and the fourth port are 90 degrees apart and the excitation amplitudes are the same, so as to achieve another type of circular polarization radiation in another frequency band.

[0050] Specifically: The phase of the first port leads the phase of the second port by 90 degrees, achieving left-handed circular polarization in the low-frequency band. At the same time, the phase of the fourth port leads the phase of the third port by 90 degrees, achieving right-handed circular polarization in the high-frequency band. Alternatively, the phase of the first port leads the phase of the second port by 90 degrees to achieve left-handed circular polarization in the high-frequency band, while the phase of the fourth port leads the phase of the third port by 90 degrees to achieve right-handed circular polarization in the low-frequency band. Alternatively, the phase of the first port lags behind the second port by 90 degrees to achieve right-handed circular polarization in the low-frequency band, while the phase of the fourth port lags behind the third port by 90 degrees to achieve left-handed circular polarization in the high-frequency band. Alternatively, the phase of the first port lags behind the second port by 90 degrees to achieve right-handed circular polarization in the high-frequency band, while the phase of the fourth port lags behind the third port by 90 degrees to achieve left-handed circular polarization in the low-frequency band.

[0051] It should be noted that the equal-amplitude orthogonal phase signal required to achieve circularly polarized radiation is realized by a feed network consisting of a power divider and a phase shifter, which is existing technology and will not be elaborated here.

[0052] The aforementioned dual-band dual-circular polarization antenna features a first and a second annular slot, capable of generating low-frequency and high-frequency bands. Each band has two resonant modes, and both bands can be independently controlled. The radiation patterns of all four resonant modes are lateral, achieving lateral radiation and improving bandwidth. Four feed probes are also designed, with corresponding ports divided into two groups. One group of ports has a 90-degree phase difference and the same amplitude to achieve one type of circular polarization radiation in one band. Simultaneously, the other group of ports has a 90-degree phase difference and the same amplitude to achieve another type of circular polarization radiation in another band. The two circular polarizations can be switched and independently controlled. The high-to-low frequency ratio of the antenna is 5 / 4 = 1.25 < 1.3, achieving a small frequency ratio.

[0053] In one specific embodiment, both the first and second dielectric layers are made of Rogers 4003C substrate with a relative permittivity of 3.55 and a thickness of 0.813 mm. The gap (air layer) between the two dielectric layers is 5 mm. The isolation hole diameter is 1.4 mm, and the feed probe diameter is 1 mm. The radiating patch is square with the following dimensions: side length 30 mm, feed point spacing 11.2 mm, square slot side length 7 mm, and "I"-shaped slot width 2 mm. The first annular slot is 1.2 mm from the edge of the radiating patch and has a slot width of 1 mm. The second annular slot is 1.9 mm from the first annular slot and has a slot width of 1.4 mm. The four feed probes, the first annular slot, and the second annular slot are all symmetrical about the structural center, as shown below. Figure 2 As shown.

[0054] The above antenna was simulated to achieve dual-band dual-circular polarization radiation performance, and the results are as follows: Figure 3 and Figure 4 As shown.

[0055] like Figure 3 As shown, the simulated S-parameters reveal that the -10dB bandwidth in the low-frequency band is 0.37GHz, covering the range of 3.9-4.27GHz, while the -10dB bandwidth in the high-frequency band is 0.35GHz, covering the range of 4.94-5.29GHz. Furthermore, it can be observed that both the low-frequency and high-frequency bands exhibit two resonant modes. The two resonant modes in the low-frequency band are located at 4GHz and 4.22GHz; the two resonant modes in the high-frequency band are located at 5GHz and 5.24GHz. The resonant mode at 4GHz is generated due to coupling between the four first bands, while the resonant mode at 4.22GHz is generated due to weakened coupling between the first bands. Similarly, the resonant mode at 5GHz is generated due to coupling between the four second bands, and the resonant mode at 5.24GHz is also generated due to weakened coupling between the second bands.

[0056] like Figure 4 As shown, the simulated low-frequency band 3dB left-handed circular polarization gain bandwidth is 0.49GHz, covering 3.81-4.3GHz; the simulated high-frequency band 3dB right-handed circular polarization gain bandwidth is 0.43GHz, covering 5.41-4.98GHz.

[0057] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0058] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0059] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended application documents.

Claims

1. A dual-band dual-circular polarization antenna, characterized in that, It includes, from top to bottom, the following layers stacked together: radiation layer, first dielectric layer, air layer, floor layer, second dielectric layer, and feed layer; The radiation layer includes: a square radiation patch and a first annular groove and a second annular groove disposed on the radiation patch and spaced apart; the centers of the radiation patch, the first annular groove and the second annular groove coincide; the first annular groove and the second annular groove are provided with notches at positions corresponding to the diagonal of the radiation patch, so that the first annular groove and the second annular groove both form a non-closed square annular structure. Two feed probes are provided on each diagonal of the radiation patch. One end of each of the four feed probes is connected to the feed layer, and the other end passes through the second dielectric layer, the floor layer, the air layer and the first dielectric layer in sequence before being connected to the radiation layer. Using a feeding probe as the feeding port, two adjacent feeding ports are grouped together, with the excitation phase of each group of feeding ports differing by 90 degrees and the excitation amplitude being the same.

2. The dual-band dual-circular polarization antenna according to claim 1, characterized in that, The radiation patch is also provided with four "I" shaped grooves; One corresponding end of each of the four "I"-shaped slots is located at the center of the radiating patch, and the other corresponding end is connected to the midpoint of the four sides of the radiating patch, so that the four "I"-shaped slots form a "+" shaped structure. The width of the "I"-shaped groove is variable to adjust the bandwidth, resonant position, and resonant depth.

3. A dual-band dual-circular polarization antenna according to claim 2, characterized in that, The center of the radiation patch is also provided with a square groove; The side length of the square slot is greater than the width of the "I"-shaped slot, and the side length of the square slot is variable to adjust the impedance matching of the dual-band.

4. A dual-band dual-circularly polarized antenna according to any one of claims 1 to 3, characterized in that, The distance between the first annular groove and the center of the radiating patch is greater than the distance between the second annular groove and the center of the radiating patch; The first annular groove includes four first strips, and the second annular groove includes four second strips; Both the first strip and the second strip are strip structures of equal width; The length of the first strip is greater than the length of the second strip, and the width of the first strip is less than the width of the second strip.

5. A dual-band dual-circular polarization antenna according to claim 4, characterized in that, Both the first strip and the second strip are symmetrical trapezoidal structures.

6. A dual-band dual-circular polarization antenna according to claim 5, characterized in that, The waist of the symmetrical trapezoidal structure is arranged parallel to the diagonal of the radiating patch.

7. A dual-band dual-circularly polarized antenna according to claim 2 or 3, characterized in that, Four "I"-shaped slots divide the radiating patch into four quadrants, and four feeding probes are respectively located in the four quadrants, and the four feeding probes are rotationally symmetrical about the center of the radiating patch. The distance between the feed probe and the center of the radiating patch is variable to adjust the impedance matching and resonant frequency of the dual-band circuit.

8. A dual-band dual-circularly polarized antenna according to any one of claims 1 to 3, characterized in that, The four power supply probes correspond to the first port, the second port, the third port, and the fourth port, respectively, in sequence. The excitation phases of the first and second ports differ by 90 degrees and the excitation amplitudes are the same, so as to achieve one type of circular polarization radiation in one frequency band; at the same time, the excitation phases of the third and fourth ports differ by 90 degrees and the excitation amplitudes are the same, so as to achieve another type of circular polarization radiation in another frequency band.

9. A dual-band dual-circularly polarized antenna according to claim 8, characterized in that: The phase of the first port leads the phase of the second port by 90 degrees, achieving left-handed circular polarization in the low-frequency band. At the same time, the phase of the fourth port leads the phase of the third port by 90 degrees, achieving right-handed circular polarization in the high-frequency band. The phase of the first port leads the phase of the second port by 90 degrees, achieving left-handed circular polarization in the high-frequency band. At the same time, the phase of the fourth port leads the phase of the third port by 90 degrees, achieving right-handed circular polarization in the low-frequency band. The phase of the first port lags behind the second port by 90 degrees to achieve right-handed circular polarization in the low-frequency band. At the same time, the phase of the fourth port lags behind the third port by 90 degrees to achieve left-handed circular polarization in the high-frequency band. The phase of the first port lags behind the second port by 90 degrees to achieve right-handed circular polarization in the high-frequency band. At the same time, the phase of the fourth port lags behind the third port by 90 degrees to achieve left-handed circular polarization in the low-frequency band.

10. A dual-band dual-circularly polarized antenna according to any one of claims 1 to 3, characterized in that, The ratio of the side length of the radiating patch to the side length of the first dielectric layer satisfies [3:10, 3:4] to improve antenna gain.

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