Dual circular polarization reconfigurable antenna

Abstract

The invention belongs to the technical field of antennas, and relates to a dual circular polarization reconfigurable antenna which 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. The radiation layer comprises a radiation patch, a branch patch and a microstrip line; the radiation patch is connected with the floor layer; the branch patch is of a V-shaped structure and is connected with a group of adjacent edges of the radiation patch through a pair of diodes in opposite directions; one end of the microstrip line is connected with the branch patch, and the other end of the microstrip line is connected with an external radio frequency port, so that the branch patch and the microstrip line form a Y-shaped structure; a direct current bias signal is input into the radio frequency port, so that one diode is switched on, and the other diode is switched off, and dual circular polarization reconfiguration of the antenna is realized. According to the invention, the bias control signal of the diode can be embedded into the radio frequency signal, and the polarization radiation reconfiguration of the dual-circular polarization electromagnetic wave of the antenna is realized.

Description

Technical Field

[0001] The present application relates to the field of antenna technology, and in particular to a dual circular polarization 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 by the environment and other signals, while circularly polarized antennas have the advantages of 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 circular polarization antenna technologies are mainly divided into the following categories: dual-port excitation based on 3dB coupler, dual-port excitation based on 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; 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 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; A DC bias signal is input into the RF port to turn on one diode and turn off the other diode, so as to realize the dual circular polarization reconfiguration of the antenna.

[0008] 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°.

[0009] In one embodiment, a portion of the radiation patch close to the microstrip line is provided with a radiation slot; 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.

[0010] In one embodiment, the ratio of the length to the width of the radiation slot is 10:1.

[0011] In one embodiment, triangular grooves are provided at two ends of the branch patch near the radiation patch. In one embodiment, the branch patch includes: a first branch node and a second branch node; 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 vertically arranged, and the first branch node and the second branch node are axially symmetrically distributed about the microstrip line.

[0012] 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.

[0013] In one embodiment, the distance between the radiation patch and the branch patch is 0.3 times the width of the branch patch.

[0014] In one embodiment, the side length of the dielectric substrate is more than three times the side length of the radiation patch.

[0015] In one embodiment, the length of the microstrip line is one quarter of the guided wavelength in the dielectric substrate.

[0016] The 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 two diodes. The polarization radiation of the dual circularly polarized electromagnetic waves of the antenna can be reconfigured by loading a forward DC voltage or a reverse DC voltage on the antenna feed end. Only one structure (microstrip line) is used to realize two functions (the functions of microstrip line and DC bias line in the prior art). No additional bias line needs to be designed. The principle is clear, the structure is simple, the processing is convenient, and the integration is easy. The application prospect is broad. At the same time, the circular polarization performance of the antenna is good (the difference between the left-handed circular polarization and the right-handed 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 realize the conversion of dual circular polarization. There is no need to design a multi-layer dielectric substrate due to the introduction of a 3dB coupler, which reduces the profile. 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, airborne / satellite-borne communication detection antennas, etc., which have high requirements on antenna profile and aperture efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of a dual circular polarization reconfigurable antenna in one embodiment; Figure 2 An axial ratio curve diagram of a dual circular polarization reconfigurable antenna under different dielectric substrates in one embodiment; Figure 3 A gain curve diagram of a dual circular polarization reconfigurable antenna under different dielectric substrates in one embodiment; Figure 4 A control curve diagram of different radiation slot widths versus circular polarization axis ratio resonance points of a dual circular polarization reconfigurable antenna in one embodiment; Figure 5 A graph showing the influence of different microstrip transmission line widths on the antenna reflection coefficient resonance of a dual circular polarization reconfigurable antenna in one embodiment; Figure 6 is a top-down dimension diagram of a dual circular polarization reconfigurable antenna in one embodiment; Figure 7 is a bottom-up dimension diagram of a dual circular polarization reconfigurable antenna in one embodiment; Figure 8 is a side-view dimensional diagram of a dual circular polarization reconfigurable antenna in one embodiment; Fig. 9 is an equivalent circuit diagram of a diode of a dual circular polarization reconfigurable antenna in an on state and an off state in an embodiment; Fig.10is a current distribution diagram of a left PIN diode of a dual circular polarization reconfigurable antenna in one embodiment at a center frequency (10.5 GHz); Fig.11 is a current distribution diagram of a dual circular polarization reconfigurable antenna in an embodiment when the right PIN diode is turned on at the center frequency (10.5 GHz); Fig.12 is a port reflection coefficient diagram of a dual circular polarization reconfigurable antenna in one embodiment; Fig.13 A dual circular polarization reconfigurable antenna in one embodiment has a radiation pattern in which the left PIN diode is turned on and the right PIN diode is turned off at a center frequency (10.5 GHz) to achieve left circular polarization; Fig.14 A radiation pattern of a dual circular polarization reconfigurable antenna in an embodiment at a center frequency (10.5 GHz) with a left PIN diode turned on and a right PIN diode turned off to achieve right circular polarization; Fig.15 A radiation pattern of a dual circular polarization reconfigurable antenna in an embodiment, in which the left PIN diode is cut off and the right PIN diode is turned on at a center frequency (10.5 GHz) to achieve left circular polarization; Fig.16 A radiation pattern of a dual circular polarization reconfigurable antenna in an embodiment at a center frequency (10.5 GHz) with a left PIN diode turned off and a right PIN diode turned on to achieve right circular polarization; Fig.17 A graph showing gain variation with frequency for left circular polarization and right circular polarization of a dual circular polarization reconfigurable antenna in one embodiment; Fig.18 is a schematic diagram of a cross circular polarization level (left circular polarization minus right circular polarization gain) of a dual circular polarization reconfigurable antenna in one embodiment; Fig.19 FIG. 6 is a 6 dB axial ratio curve diagram of a dual circular polarization reconfigurable antenna in an embodiment.

[0018] Reference numerals: Radiation patch 1; Branch patch 2, first branch 21, second branch 22; Microstrip line 3; Diode 4 Radiation slot 5; Dielectric substrate 6. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0020] 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 components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0021] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "multiple groups" means at least two groups, such as two groups, three groups, etc., unless otherwise clearly and specifically defined.

[0022] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, a physical connection, or a wireless communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0023] 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 the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0024] 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. The dielectric substrate is a load-bearing component that provides loading space for the radiation layer and the floor layer.

[0025] 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, and includes: a radiation patch, a branch patch, and a microstrip line.

[0026] The radiation 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, and 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.

[0027] The branch patch has a "V"-shaped structure and is connected to a set of adjacent sides of the radiation patch through a pair of diodes (such as PIN diodes) in opposite directions.

[0028] The microstrip line is a rectangular structure, one end of which is connected to the corner end of the branch patch, and the other end is connected to the external RF port, so that the branch patch and the microstrip line as a whole form a "Y"-shaped structure.

[0029] The floor layer is a grounding component, which is arranged on the lower surface of the dielectric substrate, and is specifically a full-coverage floor.

[0030] 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, and the dual circular polarization reconfiguration of the antenna is achieved.

[0031] 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 an angle of 45°, 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.

[0032] 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 circular polarization performance and the decrease of gain, and facilitate miniaturization. Figure 2 and Figure 3 As shown, "this application" refers to the situation that "the side length of the dielectric substrate is more than three times the side length of the radiation patch", and "others" refers to other situations except "the side length of the dielectric substrate is more than three times the side length of the radiation patch".

[0033] More preferably, a portion of the radiation patch close to the microstrip line is provided with a radiation slot; the radiation slot is a strip structure, the symmetry axis of the strip structure is colinear 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 changes to a low frequency, thereby regulating the circular polarization resonant current, such as Figure 4 shown.

[0034] 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.

[0035] 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 RF current and a control voltage circuit of the diode, thereby realizing circularly polarized radiation and polarization reconfigurable control.

[0036] In one embodiment, 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 less than the side length of the radiation patch; the first branch and the second branch are vertically arranged, and the first branch and the second branch are axially symmetrically distributed about the microstrip line. The above arrangement enables the branch patch and the radiation patch to form a strongly coupled slot structure to achieve more optimized radiation current resonance, increase the radiation performance of the antenna, and achieve symmetrical radiation of two circular polarizations.

[0037] 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. 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 10.5 GHz is achieved, and the circularly polarized radiation performance is good.

[0038] In one embodiment, one end of the diode is connected to a non-midpoint of the side length on the radiation 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.

[0039] 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.

[0040] 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 prior art and will not be described in detail here.

[0041] The 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 two diodes. The polarization radiation of the dual circularly polarized electromagnetic waves of the antenna can be reconfigured by loading a forward DC voltage or a reverse DC voltage on the antenna feed end. Only one structure (microstrip line) is used to realize two functions (the functions of microstrip line and DC bias line in the prior art). No additional bias line needs to be designed. The principle is clear, the structure is simple, the processing is convenient, and the integration is easy. The application prospect is broad. At the same time, the circular polarization performance of the antenna is good (the difference between the left-handed circular polarization and the right-handed 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 realize the conversion of dual circular polarization. There is no need to design a multi-layer dielectric substrate due to the introduction of a 3dB coupler, which reduces the profile. 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, airborne / satellite-borne communication detection antennas, etc., which have high requirements on antenna profile and aperture efficiency.

[0042] In a specific embodiment, the dielectric substrate is made of F4B255 material, whose dielectric constant is 2.55, dielectric loss is 0.001, length and width are both 22mm, and thickness is 1mm; the side length of the radiation patch is 7.2mm, the length of the radiation groove is 2mm, and the width is 0.2mm; the length of the branch patch is 6.5mm, the width is 1mm, and the right-angle side length of the triangular groove is 0.5mm; the distance between the radiation patch and the branch patch is 0.3mm; the diode is located at a position where the midpoint of the edge of the radiation patch is offset 0.9mm away from the microstrip line; the length of the microstrip line is 4.8mm and the width is 1.5mm; the length and width of the floor layer are both 22mm, and the thickness is 0.035mm; the diameter of the metal column connecting the radiation patch and the floor layer is 0.6mm; the specific dimensions are as follows Figures 6 to 8 shown.

[0043] like Fig. 9 As shown, the diode itself has inductance properties. When it is turned on, it is equivalent to an inductor series resistor, and when it is turned off, it is equivalent to a capacitor series resistor. By setting the diode's on or off equivalent circuit in the electromagnetic full-wave simulation software to characterize the diode's working state, the simulation calculation of the reconfigurable (i.e., left circular polarization and right circular polarization) design can be realized.

[0044] like Fig.10 and Fig.11 As shown, after the left diode is turned on, a current flow path will be formed between the left branch (first branch) and the left side of the radiation patch, and the feeding signal will flow into the radiation patch through the left diode to form a left circularly polarized current resonant circuit, thereby generating the radiation of left-handed circularly polarized electromagnetic waves; similarly, after the right diode is turned on, the right branch (second branch) and the right side of the radiation patch are connected, resulting in the generation of right-handed circularly polarized electromagnetic waves. Therefore, by controlling one diode to be turned on and the other diode to be turned off, the control of the radiation of two circularly polarized electromagnetic waves can be achieved (specifically, when the left diode is turned on and the right diode is turned off, the radiation of left circularly polarized electromagnetic waves is achieved; when the left diode is turned off and the right diode is turned on, the radiation of right circularly polarized electromagnetic waves is achieved), and the radiation of two circular polarization states can be reconfigured by adding a forward or reverse DC bias voltage to the RF feed line (microstrip line) without having to set up the microstrip line and the DC bias control line at the same time.

[0045] like Fig.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 point is less than -20dB, the reflection coefficient is good, and the port matching characteristics of the antenna are excellent.

[0046] like Fig.13 and Fig.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.

[0047] like Fig.15 and Fig.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.

[0048] like Fig.17 As shown, the antenna can achieve normal radiation of dual circularly polarized electromagnetic waves, with a maximum gain of 7.02dBi. The entire calculation frequency band (10GHz-11GHz) is within the 3dB gain bandwidth, and the broadband gain characteristic is good.

[0049] like Fig.18 and Fig.19 As shown in the figure, within the bandwidth of 10.296GHz to 10.773GHz, the cross-circular polarization level can be higher than 10dB, and the circular polarization axial ratio is less than 6dB, which basically coincides with the above-mentioned frequency band. At the center frequency of 10.5GHz, it has the best circular polarization characteristics, with an axial ratio of 2.48dB and a cross-polarization level of 16.99dB in the main radiation direction, and excellent circular polarization characteristics.

[0050] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0051] The technical features of the above embodiments may 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.

[0052] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A dual circular polarization reconfigurable antenna, characterized in that: include: A dielectric substrate, a radiation layer disposed on the upper surface of the dielectric substrate, and a floor layer disposed 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 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; A DC bias signal is input into the RF port to turn on one diode and turn off the other diode, so as to realize the dual circular polarization reconfiguration of the antenna.

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

3. A dual circular polarization reconfigurable antenna according to claim 2, characterized in that: A radiation slot is provided on the radiation patch at a portion 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 two ends of the branch patch near the radiation patch.

6. A dual circular polarization reconfigurable antenna according to any one of claims 1 to 5, characterized in that: The branch patch includes: a first branch node and a second branch node; 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 vertically arranged, and the first branch node and the second branch node are axially symmetrically distributed about 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. A 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. A 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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