A dual circular polarization reconfigurable antenna

Abstract

The present application belongs to the field of antenna technology and relates to a dual-circular polarization reconfigurable antenna, comprising: a dielectric substrate, a radiating layer provided on the upper surface of the dielectric substrate, and a floor layer provided on the lower surface of the dielectric substrate; the radiating layer comprises: a radiating patch, a branch patch, and a microstrip line; the radiating patch is connected to the floor layer; the branch patch is a "V"-shaped structure and is connected to a set of adjacent edges of the radiating patch via a pair of diodes in opposite directions; one end of the microstrip line is connected to the branch patch and the other end is connected to an external RF port, so that the branch patch and the microstrip line form a "Y"-shaped structure; the RF port inputs a DC bias signal, turning on one diode and cutting off the other diode, thereby realizing the dual-circular polarization reconfiguration of the antenna. The present application can embed the diode bias control signal into the RF signal to realize the polarization radiation reconfiguration of the dual-circular polarization electromagnetic waves of the antenna.

Description

Technical Field

[0001] The present application relates to the field of antenna technology, and in particular to a dual circularly polarized reconfigurable antenna. Background Art

[0002] As a device for radiating and receiving electromagnetic waves, antennas play an irreplaceable role in modern wireless communications, detection and perception, electronic countermeasures and other fields.

[0003] Among them, linearly polarized electromagnetic waves are easily interfered with by the environment and other signals, while circularly polarized antennas have advantages such as smaller polarization mismatch and resistance to multipath effects. Therefore, circularly polarized antennas are often used for communication in scenarios where high-stability signal transmission is required. The ability to flexibly switch between dual circularly polarized electromagnetic wave radiation undoubtedly brings double protection to fields such as satellite communications and radar detection, and has huge application potential in the civil, military, and scientific research fields of modern human society.

[0004] In the prior art, dual circularly polarized antenna technologies are mainly divided into the following categories: dual-port excitation based on a 3dB coupler, dual-port excitation based on a single loop, and multi-channel control based on multiple diode bias lines.

[0005] However, the first two technologies undoubtedly increase the design of the RF circuit and add a more complex circuit structure, while the latter technology will introduce a more complex bias design and control. Summary of the Invention

[0006] Based on this, it is necessary to provide a dual circular polarization reconfigurable antenna to address the above technical problems, which can embed the bias control signal of the diode into the radio frequency signal to achieve reconfigurable polarization radiation of the antenna's dual circular polarization electromagnetic waves.

[0007] A dual circular polarization reconfigurable antenna comprises: a dielectric substrate, a radiation layer arranged on the upper surface of the dielectric substrate, and a floor layer arranged on the lower surface of the dielectric substrate;

[0008] The radiation layer includes: a radiation patch, a branch patch, and a microstrip line; the radiation patch is connected to the ground layer; the branch patch is a "V"-shaped structure and is connected to a group of adjacent sides of the radiation patch through a pair of diodes in opposite directions; one end of the microstrip line is connected to the branch patch, and the other end is connected to an external RF port, so that the branch patch and the microstrip line form a "Y"-shaped structure;

[0009] A DC bias signal is input to the RF port to turn on one diode and turn off the other diode, thereby realizing the dual circular polarization reconfiguration of the antenna.

[0010] In one embodiment, the dielectric substrate and the radiation patch are both square structures, and a diagonal line of the dielectric substrate and a diagonal line of the radiation patch form an angle of 45°.

[0011] In one embodiment, a portion of the radiation patch close to the microstrip line is provided with a radiation slot;

[0012] The radiation slot is a strip structure, the symmetry axis of the strip structure is collinear with a diagonal line of the radiation patch, and the length direction of the strip structure is consistent with the length direction of the microstrip line.

[0013] In one embodiment, the ratio of the length to the width of the radiation slot is 10:1.

[0014] In one embodiment, triangular grooves are provided at both ends of the branch patch near the radiation patch.

[0015] In one embodiment, the branch patch includes: a first branch and a second branch;

[0016] The first branch and the second branch are both strip-shaped structures, and the length of the first branch is smaller than the side length of the radiation patch;

[0017] The first branch node and the second branch node are arranged perpendicularly, and the first branch node and the second branch node are distributed in an axisymmetric manner with respect to the microstrip line.

[0018] In one embodiment, one end of the diode is connected to a non-midpoint of a side length on the radiation patch, and the other end is connected to a position on the branch patch close to the triangular groove.

[0019] In one embodiment, the distance between the radiation patch and the branch patch is 0.3 times the width of the branch patch.

[0020] In one embodiment, the side length of the dielectric substrate is more than three times the side length of the radiation patch.

[0021] In one embodiment, the length of the microstrip line is one quarter of the guided wavelength in the dielectric substrate.

[0022] The above-mentioned dual-circularly polarized reconfigurable antenna embeds the bias control signal of the diode into the radio frequency signal (embedded hidden bias line). One bias signal can realize the control of the two diodes. By loading a forward DC voltage or a reverse DC voltage on the antenna feed end, the polarization radiation of the dual-circular polarized electromagnetic wave of the antenna can be reconfigured. Only one structure (microstrip line) is used to realize two functions (the functions of microstrip line and DC bias line in the existing technology), without the need to design an additional bias circuit. The principle is clear, the structure is simple, the processing is convenient, and it is easy to integrate. It has broad application prospects. At the same time, the circular polarization performance of the antenna is good (the difference between the left-hand circular polarization and the right-hand circular polarization in the main radiation direction is more than 10dB, and some frequency points can reach 16dB. The axial ratio curve is below 6 dB, and some are below 3 dB). dB or less); in addition, the antenna only needs one layer of dielectric substrate to achieve dual circular polarization conversion, and there is no need to design a multi-layer dielectric substrate due to the introduction of a 3dB coupler, which reduces the cross-section. It has the characteristics of flexible and reconfigurable dual circular polarization, simple control, flexible installation, and easy processing and manufacturing. It can play an important role in application fields such as satellite communications and radar detection, especially in application scenarios such as the new generation of mobile communications, detection radars, and airborne / spaceborne communication detection antennas that have high requirements on antenna cross-section and aperture efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Schematic diagram of the structure of a dual circular polarization reconfigurable antenna in one embodiment;

[0024] Figure 2 An axial ratio curve diagram of a dual circularly polarized reconfigurable antenna under different dielectric substrates in one embodiment;

[0025] Figure 3 1. A gain curve diagram of a dual circularly polarized reconfigurable antenna under different dielectric substrates in one embodiment;

[0026] Figure 4 A graph showing the regulation of the circular polarization axis ratio resonance point for different radiation slot widths of a dual circularly polarized reconfigurable antenna in one embodiment;

[0027] Figure 5 A graph showing the effect of different microstrip transmission line widths on the antenna reflection coefficient resonance of a dual circularly polarized reconfigurable antenna in one embodiment;

[0028] Figure 6 FIG1 is a top-down dimensional diagram of a dual circularly polarized reconfigurable antenna in one embodiment;

[0029] Figure 7 FIG1 is a bottom-view dimensional diagram of a dual circularly polarized reconfigurable antenna according to an embodiment;

[0030] Figure 8FIG1 is a side dimensional diagram of a dual circularly polarized reconfigurable antenna according to an embodiment;

[0031] Figure 9 is an equivalent circuit diagram of a diode of a dual circularly polarized reconfigurable antenna in an on-state and an off-state in one embodiment;

[0032] Figure 10 1 is a current distribution diagram of a dual circularly polarized reconfigurable antenna in one embodiment when the left PIN diode is turned on at the center frequency (10.5 GHz);

[0033] Figure 11 1 is a current distribution diagram of a dual circularly polarized reconfigurable antenna in one embodiment when the right PIN diode is turned on at the center frequency (10.5 GHz);

[0034] Figure 12 is a port reflection coefficient diagram of a dual circularly polarized reconfigurable antenna in one embodiment;

[0035] Figure 13 A radiation pattern of a dual circularly polarized reconfigurable antenna in one embodiment at a center frequency (10.5 GHz) with the left PIN diode turned on and the right PIN diode turned off to achieve left circular polarization;

[0036] Figure 14 A radiation pattern of a dual circularly polarized reconfigurable antenna in one embodiment at a center frequency (10.5 GHz) with the left PIN diode turned on and the right PIN diode turned off to achieve right circular polarization;

[0037] Figure 15 The radiation pattern of a dual circularly polarized reconfigurable antenna in one embodiment is as follows: the left PIN diode is cut off and the right PIN diode is turned on at the center frequency (10.5 GHz) to achieve left circular polarization;

[0038] Figure 16 The radiation pattern of a dual circularly polarized reconfigurable antenna in one embodiment is as follows: the left PIN diode is cut off and the right PIN diode is turned on at the center frequency (10.5 GHz) to achieve right circular polarization;

[0039] Figure 17 A graph showing gain variation versus frequency for left circular polarization and right circular polarization of a dual circular polarization reconfigurable antenna in one embodiment;

[0040] Figure 18 is a schematic diagram of the cross-circular polarization level (left circular polarization gain minus right circular polarization gain) of a dual circular polarization reconfigurable antenna in one embodiment;

[0041] Figure 19 FIG. 6 is a 6 dB axial ratio curve diagram of a dual circularly polarized reconfigurable antenna in one embodiment.

[0042] Reference numerals:

[0043] Radiation patch 1;

[0044] Branch patch 2, first branch 21, second branch 22;

[0045] Microstrip line 3;

[0046] Diode 4

[0047] Radiation trough 5;

[0048] Dielectric substrate 6. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solutions and advantages of this application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely for explaining this application and are not intended to limit this application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in this application without creative work are within the scope of protection of this application.

[0050] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0051] In addition, the terms "first," "second," and so on, used in this application are for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this application, "multiple groups" means at least two groups, such as two groups, three groups, and so on, unless otherwise specifically defined.

[0052] In this application, unless otherwise specified or limited, the terms "connect," "fix," etc. should be understood in a broad sense. For example, "fix" can mean a fixed connection, a detachable connection, or an integral connection; 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 internal communication between two elements or an interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0053] In addition, the technical solutions between the various embodiments of the present application can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0054] The present application provides a dual circular polarization reconfigurable antenna, such as Figure 1 As shown, in one embodiment, it includes: a dielectric substrate, a radiation layer and a floor layer.

[0055] The dielectric substrate is a load-bearing component that provides loading space for the radiation layer and the floor layer.

[0056] The radiation layer is a radiation component, serving as the radiation body of the antenna, and is arranged on the upper surface of the dielectric substrate. It includes: a radiation patch, a branch patch, and a microstrip line.

[0057] The radiating patch has a square structure, and a group of adjacent sides are connected to the branch patch through a pair of diodes (such as PIN diodes) in opposite directions (that is, one side is connected to the branch patch through a diode, and the other side is connected to the branch patch through another diode. These two sides are adjacent sides, and the directions of the two diodes are opposite), and are connected to the ground layer through metal wires (or metal through-holes or metal columns) to form a resonant current loop.

[0058] The branch patch has a "V"-shaped structure and is connected to a group of adjacent sides of the radiation patch through a pair of diodes (such as PIN diodes) with opposite directions.

[0059] The microstrip line has a rectangular structure, one end of which is connected to a corner end of the branch patch, and the other end is connected to an external RF port, so that the branch patch and the microstrip line as a whole form a "Y"-shaped structure.

[0060] The floor layer is a grounding component, which is provided on the lower surface of the dielectric substrate, and is specifically a full-coverage floor.

[0061] In this embodiment, a DC bias signal is input to the RF port to turn on one diode and turn off the other diode, so that one control signal is used to control the two diodes. The current flowing through the branch patch and the radiation patch is controlled by turning on or off the diodes, thereby realizing the dual circular polarization reconfiguration of the antenna.

[0062] Preferably, the dielectric substrate and the radiating patch are both square structures, and the diagonal of the dielectric substrate and the diagonal of the radiating patch form a 45° angle, so that the radiating patch can better fit with the branch patch and the microstrip line, generate a stronger circularly polarized resonant current and form a "V"-shaped resonance, thereby increasing the resonance depth of the antenna reflection coefficient.

[0063] Further preferably, the side length of the dielectric substrate is more than three times the side length of the radiation patch to ensure the impedance distribution and current distribution on the surface of the radiation layer, avoid the shift of the circular polarization performance and the decrease of the gain, and facilitate miniaturization. Figure 2 and Figure 3 As shown, "this application" refers to the situation where "the side length of the dielectric substrate is more than three times the side length of the radiation patch", and "other" refers to other situations except "the side length of the dielectric substrate is more than three times the side length of the radiation patch".

[0064] More preferably, a radiation slot is provided on the portion of the radiation patch close to the microstrip line; the radiation slot is a strip structure, the symmetry axis of the strip structure is collinear with a diagonal line of the radiation patch, and the length direction of the strip structure is consistent with the length direction of the microstrip line. The provision of the radiation slot can improve the broadband circular polarization characteristics of the antenna. As the width of the radiation slot increases, the circular polarization resonance point shifts to a low frequency, thereby regulating the circular polarization resonant current, such as Figure 4 shown.

[0065] More preferably, the ratio of the length to the width of the radiation slot is 10:1, so as to generate a tuned axial ratio resonance point without affecting the antenna resonant current, thereby maximizing the overlap between the circular polarization resonance point and the reflection coefficient resonance point of the antenna at a center frequency of 10.5 GHz.

[0066] More preferably, the radiation patch is arranged at the center of the upper surface of the dielectric substrate, and the center of the radiation patch is connected to the center of the floor layer to form a resonant circuit of the radio frequency current and a control voltage circuit of the diode, thereby realizing circularly polarized radiation and polarization reconfigurable control.

[0067] In one embodiment, the branch patch includes a first branch and a second branch; both the first branch and the second branch are strip-shaped, with the length of the first branch being shorter than the side length of the radiating patch; the first branch and the second branch being arranged perpendicularly and axially symmetrically with respect to the microstrip line. This arrangement enables the branch patch and the radiating patch to form a strongly coupled slot structure, thereby achieving more optimized radiation current resonance, increasing the antenna's radiation performance, and achieving symmetrical radiation of two circular polarizations.

[0068] Preferably, symmetrical triangular grooves are provided at both ends of the branch patch near the radiation patch, that is, a triangular groove is provided at the end of the first branch that is not connected to the second branch and the end of the second branch that is not connected to the first branch, and the two triangular grooves are axially symmetrically distributed so that the feed current can pass through the edge of the branch patch more smoothly, reducing the signal reflection generated by the right-angle structure of the edge, thereby avoiding the influence of the reflected signal on the main radiation structure of the antenna and enhancing the resonance performance of the antenna.

[0069] Further preferably, the distance between the radiation patch and the branch patch is 0.3 times the width of the branch patch, so as to affect the resonant current of the antenna, ensure the antenna radiation gain and the axial ratio of the circular polarization, and obtain excellent circular polarization characteristics; specifically, when the distance Bias=0.3, broadband circularly polarized radiation within the center frequency of 10.5GHz is achieved, and the circularly polarized radiation performance is good.

[0070] In one embodiment, one end of the diode is connected to a non-midpoint of the side length of the radiating patch, and the other end is connected to a position close to the triangular groove on the branch patch to generate a better circularly polarized resonant current, reduce signal reflection, expand bandwidth, and achieve a wider impedance bandwidth.

[0071] In one embodiment, the length of the microstrip line is one-quarter of the guided wavelength in the dielectric substrate, and the width of the microstrip line corresponds to the impedance of the microstrip line, so as to further expand the bandwidth of the antenna, enhance the resonance depth, and improve the impedance matching characteristics of the antenna. Figure 5 shown.

[0072] It should be noted that the radiation layer and the floor layer are both made of metal materials, and the dielectric substrate is made of non-metallic materials. The specific materials are known in the art and will not be described in detail here.

[0073] The above-mentioned dual-circularly polarized reconfigurable antenna embeds the bias control signal of the diode into the radio frequency signal (embedded hidden bias line). One bias signal can realize the control of the two diodes. By loading a forward DC voltage or a reverse DC voltage on the antenna feed end, the polarization radiation of the dual-circular polarized electromagnetic wave of the antenna can be reconfigured. Only one structure (microstrip line) is used to realize two functions (the functions of microstrip line and DC bias line in the existing technology), without the need to design an additional bias circuit. The principle is clear, the structure is simple, the processing is convenient, and it is easy to integrate. It has broad application prospects. At the same time, the circular polarization performance of the antenna is good (the difference between the left-hand circular polarization and the right-hand circular polarization in the main radiation direction is more than 10dB, and some frequency points can reach 16dB. The axial ratio curve is below 6 dB, and some are below 3 dB). dB or less); in addition, the antenna only needs one layer of dielectric substrate to achieve dual circular polarization conversion, and there is no need to design a multi-layer dielectric substrate due to the introduction of a 3dB coupler, which reduces the cross-section. It has the characteristics of flexible and reconfigurable dual circular polarization, simple control, flexible installation, and easy processing and manufacturing. It can play an important role in application fields such as satellite communications and radar detection, especially in application scenarios such as the new generation of mobile communications, detection radars, and airborne / spaceborne communication detection antennas that have high requirements on antenna cross-section and aperture efficiency.

[0074] In a specific embodiment, the dielectric substrate is made of F4B255 material, which has a dielectric constant of 2.55, a dielectric loss of 0.001, a length and width of 22 mm, and a thickness of 1 mm; the side length of the radiation patch is 7.2 mm, the length of the radiation groove is 2 mm, and the width is 0.2 mm; the length of the branch patch is 6.5 mm, the width is 1 mm, and the right-angled side length of the triangular groove is 0.5 mm; the distance between the radiation patch and the branch patch is 0.3 mm; the diode is located at a position 0.9 mm away from the microstrip line at the midpoint of the edge of the radiation patch; the length of the microstrip line is 4.8 mm, and the width is 1.5 mm; the length and width of the floor layer are 22 mm, and the thickness is 0.035 mm; the diameter of the metal column connecting the radiation patch and the floor layer is 0.6 mm; the specific dimensions are as follows Figures 6 to 8 shown.

[0075] like Figure 9 As shown, a diode inherently has inductive properties. When conducting, it behaves like an inductor in series with a resistor, and when off, it behaves like a capacitor in series with a resistor. By setting up equivalent circuits for both on and off states within electromagnetic full-wave simulation software to characterize the diode's operating state, we can simulate a reconfigurable design (i.e., achieving both left- and right-handed circular polarization).

[0076] like Figure 10 and Figure 11 As shown in the figure, when the left diode is turned on, a current flow path is formed between the left branch (the first branch) and the left side of the radiating patch. The feed signal flows through the left diode into the radiating patch, forming a left-circularly polarized current resonant circuit, thereby generating the radiation of left-handed circularly polarized electromagnetic waves. Similarly, when the right diode is turned on, it connects the right branch (the second branch) and the right side of the radiating patch, resulting in the generation of right-handed circularly polarized electromagnetic waves. Therefore, by controlling one diode to be turned on and the other to be turned off, the radiation of two circularly polarized electromagnetic waves can be controlled (specifically, when the left diode is turned on and the right diode is turned off, the radiation of left-handed circularly polarized electromagnetic waves is achieved; when the left diode is turned off and the right diode is turned on, the radiation of right-handed circularly polarized electromagnetic waves is achieved). Moreover, the radiation of the two circular polarization states can be reconfigured simply by adding a forward or reverse DC bias voltage to the RF feed line (microstrip line), without having to set up both the microstrip line and the DC bias control line.

[0077] like Figure 12 As shown, the -10dB impedance bandwidth is 10.1GHz-11GHz, the center frequency band is about 10.5GHz, the resonance depth near the center frequency is less than -20dB, the reflection coefficient is good, and the port matching characteristics of the antenna are excellent.

[0078] like Figure 13 and Figure 14As shown, when the left diode is turned on and the right diode is turned off, the antenna radiates left circularly polarized electromagnetic waves. The gain of the left circularly polarized electromagnetic waves is 7.02dBi, the gain of the right circularly polarized electromagnetic waves is -5.8dBi, the cross-polarization level is 12.28dB, and the circular polarization characteristics are good.

[0079] like Figure 15 and Figure 16 As shown, when the left diode is cut off and the right diode is turned on, the antenna radiates right circularly polarized electromagnetic waves. The gain of the left circularly polarized electromagnetic waves is -5.4dBi, the gain of the right circularly polarized electromagnetic waves is 6.9dBi, the cross-polarization level is 11.3dB, and the circular polarization characteristics are good.

[0080] like Figure 17 As shown, the antenna can achieve normal radiation of dual circularly polarized electromagnetic waves, with a maximum gain of 7.02dBi. The entire calculated frequency band (10GHz-11GHz) is within the 3dB gain bandwidth, and the broadband gain characteristic is good.

[0081] like Figure 18 and Figure 19 As shown, within the 10.296 GHz to 10.773 GHz bandwidth, a cross-circular polarization level exceeding 10 dB can be achieved. Furthermore, the range in which its circular polarization axial ratio is less than 6 dB essentially overlaps with the aforementioned frequency band. At the center frequency of 10.5 GHz, the optical fiber exhibits the best circular polarization characteristics, with an axial ratio of 2.48 dB and a cross-polarization level of 16.99 dB in the main radiation direction, demonstrating excellent circular polarization characteristics.

[0082] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0083] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, 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.

[0084] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended claims.

Claims

1. A dual circular polarization reconfigurable antenna, characterized in that: include: A dielectric substrate, a radiation layer provided on the upper surface of the dielectric substrate, and a floor layer provided on the lower surface of the dielectric substrate; The radiation layer includes: a radiation patch, a branch patch and a microstrip line; the radiation patch is connected to the floor layer; The branch patch has a "V"-shaped structure and is connected to a group of adjacent sides of the radiating patch through a pair of diodes in opposite directions; one end of the microstrip line is connected to the branch patch, and the other end is connected to the external RF port, so that the branch patch and the microstrip line form a "Y"-shaped structure; A DC bias signal is input to the RF port to turn on one diode and turn off the other diode, thereby realizing the dual circular polarization reconfiguration of the antenna.

2. The dual circular polarization reconfigurable antenna according to claim 1, characterized in that: The dielectric substrate and the radiation patch are both square structures, and a diagonal line of the dielectric substrate and a diagonal line of the radiation patch form an angle of 45°.

3. The dual circular polarization reconfigurable antenna according to claim 2, characterized in that: A radiation slot is provided on the portion of the radiation patch close to the microstrip line; The radiation slot is a strip structure, the symmetry axis of the strip structure is collinear with a diagonal line of the radiation patch, and the length direction of the strip structure is consistent with the length direction of the microstrip line.

4. The dual circular polarization reconfigurable antenna according to claim 3, characterized in that: The ratio of the length to the width of the radiation slot is 10:

1.

5. The dual circular polarization reconfigurable antenna according to claim 4, characterized in that: Triangular grooves are provided at positions near the radiation patch at both ends of the branch patch.

6. The dual circular polarization reconfigurable antenna according to any one of claims 1 to 5, characterized in that: The branch patch includes: a first branch and a second branch; The first branch and the second branch are both strip-shaped structures, and the length of the first branch is smaller than the side length of the radiation patch; The first branch node and the second branch node are arranged perpendicularly, and the first branch node and the second branch node are distributed in an axisymmetric manner with respect to the microstrip line.

7. The dual circular polarization reconfigurable antenna according to claim 5, characterized in that: One end of the diode is connected to a non-midpoint of a side length on the radiation patch, and the other end is connected to a position on the branch patch close to the triangular groove.

8. The dual circular polarization reconfigurable antenna according to any one of claims 1 to 5, characterized in that: The distance between the radiation patch and the branch patch is 0.3 times the width of the branch patch.

9. The dual circular polarization reconfigurable antenna according to any one of claims 1 to 5, characterized in that: The side length of the dielectric substrate is more than three times the side length of the radiation patch.

10. The dual circular polarization reconfigurable antenna according to any one of claims 1 to 5, characterized in that: The length of the microstrip line is one quarter of the guided wavelength in the dielectric substrate.

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