A dual-circularly polarized co-aperture transmit-receive simultaneous antenna

Abstract

The present invention discloses a co-aperture transmit-receive simultaneous antenna with dual circular polarization, which includes a dielectric substrate, an electromagnetic bandgap array, and a sequential rotation array. The electromagnetic bandgap array and the sequential rotation array are disposed on the upper surface of the dielectric substrate, and a metal ground is provided on the lower surface, and the metal ground forms a circular defect ground array. In the co-aperture transmit-receive simultaneous antenna with dual circular polarization of the present invention, the connected transmit feed network forms a right-handed circular polarization, and the receive feed network forms a left-handed circular polarization. Since in the co-aperture transmit-receive simultaneous antenna with dual circular polarization, the electromagnetic bandgap array and the circular defect ground array are loaded at the symmetric position in the middle of the sequential rotation array, the coupling between the transmit antenna and the receive antenna can be reduced; on the other hand, the transmit function and the receive function of the co-aperture transmit-receive simultaneous antenna with dual circular polarization share the same microstrip patch antenna element, and the required components are integrated on one layer of dielectric substrate, which has the advantages of low profile, small volume, and low cost. The present invention is widely applied to the field of antenna technology.

Description

Technical Field

[0001] The present invention relates to the technical field of antennas, and in particular to a co-aperture transmit-receive simultaneous antenna with dual circular polarization. Background Art

[0002] Co-aperture transmit-receive simultaneous antennas have been widely used and developed in transmit-receive simultaneous or full-duplex systems in recent years due to their many advantages such as small volume, strong echo signal detection at close range, and low cost. Since the transmit antenna and the receive antenna share the same aperture, that is, the same antenna is used for both transmission and reception. Therefore, in order not to affect the simultaneous and co-frequency operation of the transmitter and the receiver, the coupling between the transmit antenna and the receive antenna is the core problem that needs to be solved urgently for co-aperture transmit-receive simultaneous antennas.

[0003] To address the serious coupling problems faced by co-aperture transmit-receive simultaneous antennas, the existing methods can mainly be divided into three categories: ① The polarization modes of the transmit and receive antennas are orthogonal; ② A duplexer or isolation device is introduced; ③ The radiation patterns of the transmit antenna and the receive antenna are orthogonal. However, the method of using orthogonal polarization of the transmit and receive antennas can usually only be used in the fields of communication and electronic warfare, and cannot be used in the field of radar detection; the method of introducing a duplexer or isolator increases the volume and weight of the system, and the transmit-receive decoupling effect is usually only 15 - 20 dB, which cannot meet the actual requirements; although using different modes of the transmit antenna and the receive antenna can improve the isolation between transmission and reception to a certain extent, the similarity of the radiation patterns of the transmit antenna and the receive antenna is very poor, resulting in a decrease in the quality of the received echo signal. Summary of the Invention

[0004] Aiming at the technical problems of large volume, poor isolation between transmission and reception, poor similarity of directivity, and poor quality of echo signals existing in the current related technologies, the purpose of the present invention is to provide a co-aperture transmit-receive simultaneous antenna with dual circular polarization.

[0005] The co-aperture transmit-receive simultaneous antenna with dual circular polarization in the embodiment includes:

[0006] A dielectric substrate; the dielectric substrate includes an upper surface and a lower surface that are opposite to each other;

[0007] An electromagnetic bandgap array; the electromagnetic bandgap array is disposed on the upper surface; the electromagnetic bandgap array includes a first electromagnetic bandgap sub-array, a second electromagnetic bandgap sub-array, a third electromagnetic bandgap sub-array, and a fourth electromagnetic bandgap sub-array; the extending directions of the first electromagnetic bandgap sub-array, the second electromagnetic bandgap sub-array, the third electromagnetic bandgap sub-array, and the fourth electromagnetic bandgap sub-array divide the dielectric substrate into a first region, a second region, a third region, and a fourth region;

[0008] Sequential rotation array; the sequential rotation array is disposed on the upper surface; the sequential rotation array includes a first microstrip patch unit, a second microstrip patch unit, a third microstrip patch unit, and a fourth microstrip patch unit; the first microstrip patch unit is located in the first region, the second microstrip patch unit is located in the second region, the third microstrip patch unit is located in the third region, and the fourth microstrip patch unit is located in the fourth region;

[0009] The lower surface is provided with a metal ground, and the metal ground forms an annular defected ground array; the annular defected ground array includes a first annular defected ground sub-array, a second annular defected ground sub-array, a third annular defected ground sub-array, and a fourth annular defected ground sub-array; the first annular defected ground sub-array is located in the first region, the second annular defected ground sub-array is located in the second region, the third annular defected ground sub-array is located in the third region, and the fourth annular defected ground sub-array is located in the fourth region; the projection of the first annular defected ground sub-array surrounds the first microstrip patch unit, the projection of the second annular defected ground sub-array surrounds the second microstrip patch unit, the projection of the third annular defected ground sub-array surrounds the third microstrip patch unit, and the projection of the fourth annular defected ground sub-array surrounds the fourth microstrip patch unit.

[0010] Further, the first electromagnetic bandgap sub-array, the second electromagnetic bandgap sub-array, the third electromagnetic bandgap sub-array, and the fourth electromagnetic bandgap sub-array respectively include a plurality of electromagnetic bandgap units, and the electromagnetic bandgap units in the same electromagnetic bandgap sub-array are arranged to extend along a straight line direction.

[0011] Further, the electromagnetic bandgap unit is a square metal patch, a metal post is disposed at the center of the electromagnetic bandgap unit, and the metal post passes through the dielectric substrate and is connected to the metal ground; the electromagnetic bandgap unit is provided with a plurality of slits, and each slit starts from around the metal post and radiates towards the periphery of the electromagnetic bandgap unit.

[0012] Further, the first annular defected ground sub-array, the second annular defected ground sub-array, the third annular defected ground sub-array, and the fourth annular defected ground sub-array respectively include a plurality of annular defected ground units, and the annular defected ground units in the same annular defected ground sub-array are sequentially connected end to end to form a circle.

[0013] Further, the annular defected ground unit includes a first circular slit, a second circular slit, and an arc-shaped slit, the first circular slit is located at the head end of the arc-shaped slit, and the second circular slit is located at the tail end of the arc-shaped slit; the arc-shaped slit respectively passes through the centers of the first circular slit and the second circular slit without passing out of the first circular slit or the second circular slit.

[0014] Further, the first microstrip patch unit, the second microstrip patch unit, the third microstrip patch unit, and the fourth microstrip patch unit are all square metal patches;

[0015] The first microstrip patch unit is provided with a first port and a second port, the second microstrip patch unit is provided with a third port and a fourth port, the third microstrip patch unit is provided with a fifth port and a sixth port, and the fourth microstrip patch unit is provided with a seventh port and an eighth port;

[0016] Further, the line connecting the first port to the center of the first microstrip patch unit and the line connecting the second port to the center of the first microstrip patch unit form a right angle; the line connecting the third port to the center of the second microstrip patch unit and the line connecting the fourth port to the center of the second microstrip patch unit form a right angle; the line connecting the fifth port to the center of the third microstrip patch unit and the line connecting the sixth port to the center of the third microstrip patch unit form a right angle; the line connecting the seventh port to the center of the fourth microstrip patch unit and the line connecting the eighth port to the center of the fourth microstrip patch unit form a right angle;

[0017] The right angle formed by the first port and the second port is opposite to the right angle formed by the fifth port and the sixth port; the right angle formed by the third port and the fourth port is opposite to the right angle formed by the seventh port and the eighth port.

[0018] Further, the co-aperture transmit-and-receive simultaneous antenna further includes:

[0019] A transmit feeding network; the transmit feeding network is connected to the sequential rotation array;

[0020] A receive feeding network; the receive feeding network is connected to the sequential rotation array.

[0021] Further, the transmit feeding network includes a first 90° hybrid, a first 180° hybrid, and a second 180° hybrid;

[0022] The first 90° hybrid is respectively connected to the Diff port of the first 180° hybrid and the Sum port of the second 180° hybrid;

[0023] The 0° port of the first 180° hybrid is connected to the first port, and the 180° port of the first 180° hybrid is connected to the third port; the 0° port of the second 180° hybrid is connected to the fifth port, and the 180° port of the second 180° hybrid is connected to the seventh port.

[0024] Further, the receiving feeding network includes a second 90° bridge, a third 180° bridge, and a fourth 180° bridge;

[0025] The first 90° bridge is respectively connected to the Diff port of the third 180° bridge and the Sum port of the fourth 180° bridge;

[0026] The 0° port of the third 180° bridge is connected to the second port, and the 180° port of the third 180° bridge is connected to the fourth port; the 0° port of the fourth 180° bridge is connected to the sixth port, and the 180° port of the fourth 180° bridge is connected to the eighth port

[0027] The beneficial effects of the present invention are as follows: For a dual-circularly polarized common-aperture transmit-receive simultaneous antenna in an embodiment, when the connected transmitting feeding network forms a right-handed circular polarization and the receiving feeding network forms a left-handed circular polarization, since in the dual-circularly polarized common-aperture transmit-receive simultaneous antenna, an electromagnetic bandgap array and a circular defected ground array are loaded at the middle symmetric position of the sequential rotation array, the coupling between the transmitting antenna and the receiving antenna can be reduced; on the other hand, the transmitting function and the receiving function of the dual-circularly polarized common-aperture transmit-receive simultaneous antenna share the same microstrip patch antenna unit, and the required components are integrated on one layer of dielectric substrate, having the advantages of low profile, small volume, and low cost. Description of the Drawings

[0028] Figure 1 and Figure 2 is a schematic structural diagram of the dual-circularly polarized common-aperture transmit-receive simultaneous antenna in the embodiment;

[0029] Figure 3 is a schematic structural diagram of the circular defected ground unit in the embodiment;

[0030] Figure 4 is a schematic structural diagram of the electromagnetic bandgap unit in the embodiment;

[0031] Figure 5 is a schematic diagram of the feeding network structure of the dual-circularly polarized common-aperture transmit-receive simultaneous antenna in the embodiment;

[0032] Figure 6 is a schematic diagram of the scattering parameter curve of the dual-circularly polarized common-aperture transmit-receive simultaneous antenna in the embodiment;

[0033] Figure 7 is a schematic diagram of the gain and axial ratio of the dual-circularly polarized common-aperture transmit-receive simultaneous antenna in the embodiment. Detailed Embodiments

[0034] Refer to Figure 1, in this embodiment, the basic component of the dual-circularly polarized co-aperture transmit-receive simultaneous antenna is a dielectric substrate. The shape of the dielectric substrate can be square. The two surfaces of the dielectric substrate are the upper surface and the lower surface respectively. For example, Figure 1 the surface shown in the same plane as the paper is the upper surface, and the other surface is the lower surface. That is, a double-sided metal-coated double-sided board can be used as the dielectric substrate. The board material is polytetrafluoroethylene, its dielectric constant is 3.5, and the board thickness is 1.5 mm.

[0035] Referring to Figure 1 , through printed circuit technology, an electromagnetic bandgap array and a sequential rotation array can be fabricated on the upper surface of the dielectric substrate. For example, metal is coated on the upper surface of the dielectric substrate, and the electromagnetic bandgap array and the sequential rotation array are fabricated through metal etching.

[0036] A metal layer is coated on the lower surface of the dielectric substrate. This metal layer can serve as a ground wire, that is, a metal ground. Through etching and other treatments on the metal ground, part of the metal ground is missing, and the missing part forms an annular defect ground array. Figure 1 In figures such as, the dielectric substrate is seen in perspective, which is equivalent to projecting the electromagnetic bandgap array, the sequential rotation array, and the annular defect ground array on the dielectric substrate onto the same plane to facilitate the explanation of the principle of the dual-circularly polarized co-aperture transmit-receive simultaneous antenna.

[0037] Referring to Figure 1 , the electromagnetic bandgap array includes components such as a first electromagnetic bandgap sub-array, a second electromagnetic bandgap sub-array, a third electromagnetic bandgap sub-array, and a fourth electromagnetic bandgap sub-array.

[0038] Referring to Figure 2 , the dotted lines therein are the extension directions of the first electromagnetic bandgap sub-array, the second electromagnetic bandgap sub-array, the third electromagnetic bandgap sub-array, and the fourth electromagnetic bandgap sub-array. These extension directions of the electromagnetic bandgap sub-arrays divide the dielectric substrate into a first region, a second region, a third region, and a fourth region. Among them, regions such as the first region, the second region, the third region, and the fourth region are regions marked for explaining the positions of various components. When actually using the dual-circularly polarized co-aperture transmit-receive simultaneous antenna, it is not necessary to physically divide the dielectric substrate into these regions.

[0039] In this embodiment, the first electromagnetic bandgap sub-array, the second electromagnetic bandgap sub-array, the third electromagnetic bandgap sub-array, and the fourth electromagnetic bandgap sub-array are rotationally symmetric about the center of the dielectric substrate. For example, referring to Figure 1 and Figure 2 , if the first electromagnetic bandgap sub-array is rotated 90° around the center of the dielectric substrate, the first electromagnetic bandgap sub-array will coincide with the second electromagnetic bandgap sub-array.

[0040] Referring to Figure 1 and Figure 2, The sequential rotation array includes a first microstrip patch unit, a second microstrip patch unit, a third microstrip patch unit, and a fourth microstrip patch unit. The first microstrip patch unit is located in the first region, the second microstrip patch unit is located in the second region, the third microstrip patch unit is located in the third region, and the fourth microstrip patch unit is located in the fourth region.

[0041] In this embodiment, the first microstrip patch unit, the second microstrip patch unit, the third microstrip patch unit, and the fourth microstrip patch unit are rotationally symmetric about the center of the dielectric substrate. For example, referring to Figure 1 and Figure 2 , if the first microstrip patch unit is rotated 90° about the center of the dielectric substrate, the first electromagnetic bandgap sub-array coincides with the second microstrip patch unit.

[0042] Referring to Figure 1 and Figure 2 , a metal ground on the lower surface of the dielectric substrate forms an annular defected ground array, and the annular defected ground array includes a first annular defected ground sub-array, a second annular defected ground sub-array, a third annular defected ground sub-array, and a fourth annular defected ground sub-array.

[0043] Referring to Figure 1 and Figure 2 , through the projection perpendicular to the dielectric substrate, the first annular defected ground sub-array is located in the first region, the second annular defected ground sub-array is located in the second region, the third annular defected ground sub-array is located in the third region, and the fourth annular defected ground sub-array is located in the fourth region.

[0044] In this embodiment, referring to Figure 1 and Figure 2 , the first microstrip patch unit, the second microstrip patch unit, the third microstrip patch unit, and the fourth microstrip patch unit are all square metal patches.

[0045] In this embodiment, the first annular defected ground sub-array, the second annular defected ground sub-array, the third annular defected ground sub-array, and the fourth annular defected ground sub-array are all composed of multiple Figure 3 shown annular defected ground cells. For example, taking the first annular defected ground sub-array as an example, referring to Figure 1 and Figure 2 , the first annular defected ground sub-array is composed of 4 Figure 3 shown annular defected ground cells, and these 4 annular defected ground cells are connected end to end in sequence, thus forming the first annular defected ground sub-array with a circular main shape.

[0046] Referring to Figure 3, the annular defected ground unit is composed of an arc-shaped slit with an opening facing the patch, and a first circular slit and a second circular slit at both ends. The radian measure of the central angle of the arc-shaped slit is between 45° and 90°, and its radius is much larger than the radii of the circular slits at both ends. The arc-shaped slit passes through the centers of the first circular slit and the second circular slit at both ends, but does not exceed the radius of the first circular slit or the second circular slit. The widths of the arc-shaped slit, the first circular slit, and the second circular slit are all about 0.5 - 1 mm, and are much smaller than their own circumferences.

[0047] In this embodiment, referring to Figure 1 and Figure 2 , the projection of the first annular defected ground sub-array surrounds the first microstrip patch unit, the projection of the second annular defected ground sub-array surrounds the second microstrip patch unit, the projection of the third annular defected ground sub-array surrounds the third microstrip patch unit, and the projection of the fourth annular defected ground sub-array surrounds the fourth microstrip patch unit. Specifically, the projection of the circular first annular defected ground sub-array is circumscribed to the square first microstrip patch unit, the projection of the circular second annular defected ground sub-array is circumscribed to the square second microstrip patch unit, the projection of the circular third annular defected ground sub-array is circumscribed to the square third microstrip patch unit, and the projection of the circular fourth annular defected ground sub-array is circumscribed to the square fourth microstrip patch unit.

[0048] Referring to Figure 1 and Figure 2 , in the same annular defected ground sub-array, the 4 annular defected ground units do not intersect each other, and there is a spacing of 3 - 5 mm between the circular slits of two annular defected ground units, which can isolate the coupling effects in the horizontal and vertical directions.

[0049] Since the projection of the annular defected ground sub-array surrounds the corresponding microstrip patch unit, and the annular defected ground units are distributed around the metal patch, and its distribution diameter is larger than the length and width of the metal patch, it can reduce the backward radiation.

[0050] In this embodiment, the first electromagnetic bandgap sub-array, the second electromagnetic bandgap sub-array, the third electromagnetic bandgap sub-array, and the fourth electromagnetic bandgap sub-array are rotationally symmetric about the center of the dielectric substrate. For example, referring to Figure 1 and Figure 2 , if the first electromagnetic bandgap sub-array is rotated 90° around the center of the dielectric substrate, the first electromagnetic bandgap sub-array coincides with the second electromagnetic bandgap sub-array.

[0051] In this embodiment, the first electromagnetic bandgap sub-array, the second electromagnetic bandgap sub-array, the third electromagnetic bandgap sub-array, and the fourth electromagnetic bandgap sub-array respectively include a plurality of electromagnetic bandgap units, and the electromagnetic bandgap units in the same electromagnetic bandgap sub-array are arranged along a straight line direction.

[0052] Referring toFigure 1 and Figure 2 Taking the first electromagnetic bandgap sub-array as an example, it includes 4 electromagnetic bandgap units. These 4 electromagnetic bandgap units are arranged unidirectionally and uniformly, and the distance between two adjacent electromagnetic bandgap units is only about 0.2 mm. It is placed at the center line position of two microstrip patch antennas.

[0053] In this embodiment, the structure of the electromagnetic bandgap unit that composes the electromagnetic bandgap sub-array is as Figure 4 shown. Referring to Figure 4 , the electromagnetic bandgap unit is a square metal patch. A metal post is arranged at the center of the electromagnetic bandgap unit. The metal post passes through the dielectric substrate and is connected to the metal ground; the electromagnetic bandgap unit is provided with multiple slits, and each slit radiates from around the metal post to the periphery of the electromagnetic bandgap unit.

[0054] Referring to Figure 4 , the width of each slit in the electromagnetic bandgap unit is 0.8 mm and the length is 1.7 mm. By setting the slits, the current path can be increased, thereby reducing the size of the electromagnetic bandgap unit. The metal post at the center position of the metal patch of the electromagnetic bandgap unit is connected upward to the metal patch of the electromagnetic bandgap unit and downward to the metal ground on the lower surface of the dielectric substrate. The whole electromagnetic bandgap unit is completely symmetric about the center. The function of the metal post is equivalent to an inductor, and the function of the metal patch is equivalent to a capacitor. Therefore, the electromagnetic bandgap unit can achieve LC resonance.

[0055] In this embodiment, Figure 1 and Figure 2 The principle of the dual circular polarization common aperture transmit-receive simultaneous antenna shown lies in that: the first microstrip patch unit and the second microstrip patch unit can be connected to the transmit feeding network to achieve transmit feeding; the third microstrip patch unit and the fourth microstrip patch unit can be connected to the transmit feeding network to achieve receive feeding; when the transmit feeding network forms a right-handed circular polarization and the receive feeding network forms a left-handed circular polarization, since in the dual circular polarization common aperture transmit-receive simultaneous antenna, the electromagnetic bandgap array and the circular defected ground array are loaded at the symmetric position in the middle of the sequential rotation array, the coupling between the transmit antenna and the receive antenna can be reduced; on the other hand, the transmit function and the receive function of the dual circular polarization common aperture transmit-receive simultaneous antenna share the same microstrip patch antenna unit, and the required components are integrated on one layer of dielectric substrate, which has the advantages of low profile, small volume and low cost.

[0056] In this embodiment, referring to Figure 1 and Figure 2 , the first microstrip patch unit is provided with a first port P1 and a second port P2, the second microstrip patch unit is provided with a third port P3 and a fourth port P4, the third microstrip patch unit is provided with a fifth port P5 and a sixth port P6, and the fourth microstrip patch unit is provided with a seventh port P7 and an eighth port P8.

[0057] Specifically, referring to Figure 2 , the line connecting the first port P1 to the center of the first microstrip patch unit forms a right angle with the line connecting the second port P2 to the center of the first microstrip patch unit; the line connecting the third port P3 to the center of the second microstrip patch unit forms a right angle with the line connecting the fourth port P4 to the center of the second microstrip patch unit; the line connecting the fifth port P5 to the center of the third microstrip patch unit forms a right angle with the line connecting the sixth port P6 to the center of the third microstrip patch unit; the line connecting the seventh port P7 to the center of the fourth microstrip patch unit forms a right angle with the line connecting the eighth port P8 to the center of the fourth microstrip patch unit.

[0058] Referring to Figure 2 , the right angle formed by the first port P1 and the second port P2 is opposite to the right angle formed by the fifth port P5 and the sixth port P6; the right angle formed by the third port P3 and the fourth port P4 is opposite to the right angle formed by the seventh port P7 and the eighth port P8. That is, these four right angles are equivalent to the interior angles of a rectangle formed by connecting the centers of the first microstrip patch unit, the second microstrip patch unit, the third microstrip patch unit, and the fourth microstrip patch unit.

[0059] Among the eight ports such as the first port P1, the second port P2, the third port P3, the fourth port P4, the fifth port P5, the sixth port P6, the seventh port P7, and the eighth port P8,

[0060] In this embodiment, Figure 1 and Figure 2 the antennas shown in can be connected to the transmitting feed network and the receiving feed network. Specifically, the transmitting feed network is connected to the sequential rotation array, and the receiving feed network is connected to the sequential rotation array. The transmitting feed network and the receiving feed network also become components of the dual circularly polarized co-aperture transceiver antenna.

[0061] In this embodiment, referring to Figure 5 , the transmitting feed network includes a first 90° bridge, a first 180° bridge, and a second 180° bridge. The first 90° bridge is respectively connected to the Diff port of the first 180° bridge and the Sum port of the second 180° bridge; the receiving feed network includes a second 90° bridge, a third 180° bridge, and a fourth 180° bridge. The first 90° bridge is respectively connected to the Diff port of the third 180° bridge and the Sum port of the fourth 180° bridge.

[0062] In this embodiment, referring to Figure 5, the 0° port of the first 180° bridge is connected to the first port P1, and the 180° port of the first 180° bridge is connected to the third port P3; the 0° port of the second 180° bridge is connected to the fifth port P5, and the 180° port of the second 180° bridge is connected to the seventh port P7; the 0° port of the third 180° bridge is connected to the second port P2, and the 180° port of the third 180° bridge is connected to the fourth port P4; the 0° port of the fourth 180° bridge is connected to the sixth port P6, and the 180° port of the fourth 180° bridge is connected to the eighth port P8.

[0063] Through Figure 5 In the connection mode shown, each microstrip patch antenna unit has two mutually perpendicular feeding ports, and its feeding method is coaxial backfeeding. In each microstrip patch antenna unit, one of the two ports is for transmitting (receiving), and the other is for receiving (transmitting). The transmitting ports of each element are connected through a transmitting feeding network, and the receiving ports of each element are connected through a receiving feeding network. The coupling between the transmitting port and the receiving port is reduced by using electromagnetic bandgap and defected ground technologies. Specifically, the ports for transmitting are P1, P3, P5, P7; the ports for receiving are P2, P4, P6, P8.

[0064] Referring to Figure 4 , both the transmitting and receiving feeding networks are composed of a 90° bridge and two 180° bridges, which are lumped devices respectively. The feeding network at the transmitting end is connected to the four transmitting ports and forms phases of 0°, 90°, 180°, and 270° respectively to excite the antenna to form a right-handed circular polarization; the feeding network at the receiving end is connected to the remaining four receiving ports and forms phases of 0°, -90°, -180°, and -270° respectively to excite the antenna to form a left-handed circular polarization. The transmitting end of the transmitting feeding network is connected in sequence from left to right to a 90° 3dB bridge, two parallel 180° 3dB bridges, and the 4 transmitting ports (P1, P3, P5, P7) of the sequential rotation array. The receiving end of the receiving feeding network is connected in sequence from right to left to a 90° 3dB bridge, two parallel 180° 3dB bridges, and the 4 receiving ports (P2, P4, P6, P8) of the sequential rotation array. The 90° 3dB bridge and the two parallel 180° 3dB bridges are commercial devices and have nothing to do with specific manufacturers, parameters, and performances. After connecting the antenna through the transmitting and feeding networks, since the transmitting antenna is right-handed circular polarization and the receiving antenna is left-handed circular polarization, the isolation of the transmit-receive simultaneous antenna cannot be cancelled by phase. Based on the electromagnetic bandgap array and circular defected ground array technologies of the present invention, the coupling from the transmitting end to the receiving end can be reduced and reduced to 38 dB.

[0065] For Figure 1The simulation of the dual-circularly polarized co-aperture transmit-receive simultaneous antenna shown below is carried out, and the scattering parameter curves obtained are as Figure 6 shown, and the gain and axial ratio are as Figure 7 shown. Through Figure 6 and Figure 7 it can be seen that through the feed network, an isolation of 38 dB between the transmit port and the receive port is achieved in the frequency range of 4.25 - 4.35 GHz. At the same time, the transmit and receive antennas maintain almost the same pattern and axial ratio performance, which is suitable for miniaturized designs in fields such as radar detection.

[0066] It should be noted that unless otherwise specified, when a certain feature is referred to as "fixed" or "connected" to another feature, it can be directly fixed or connected to the other feature, or indirectly fixed or connected to the other feature. In addition, the up, down, left, right, etc. descriptions used in this disclosure are only relative to the mutual positional relationship of the various components of this disclosure in the drawings. The singular forms of "a", "the", and "said" used in this disclosure are also intended to include the plural forms unless the context clearly indicates otherwise. In addition, unless otherwise defined, all the technical and scientific terms used in this embodiment have the same meanings as those commonly understood by those skilled in the technical field of this application. The terms used in the description of this embodiment are only for describing specific embodiments and are not intended to limit the present invention. The term "and / or" used in this embodiment includes any arbitrary combination of one or more of the related listed items.

[0067] It should be understood that although the terms first, second, third, etc. may be used in this disclosure to describe various elements, these elements should not be limited to these terms. These terms are only used to distinguish elements of the same type from each other. For example, without departing from the scope of this disclosure, the first element may also be referred to as the second element, and similarly, the second element may also be referred to as the first element. The use of any and all examples or exemplary languages ("for example", "such as", etc.) provided in this embodiment is only intended to better illustrate the embodiments of the present invention and will not impose a limitation on the scope of the present invention unless otherwise required.

[0068] It should be recognized that embodiments of the present invention can be implemented or carried out by computer hardware, a combination of hardware and software, or by computer instructions stored in a non-transitory computer-readable memory. The methods can be implemented in a computer program using standard programming techniques - including a non-transitory computer-readable storage medium configured with the computer program, wherein the storage medium so configured causes the computer to operate in a specific and predefined manner - according to the methods and drawings described in the specific embodiments. Each program can be implemented in a high-level procedural or object-oriented programming language to communicate with the computer system. However, if desired, the program can be implemented in assembly or machine language. In any case, the language can be a compiled or interpreted language. In addition, for this purpose the program is capable of running on a programmed application-specific integrated circuit.

[0069] In addition, the operations of the processes described in this embodiment can be performed in any suitable order, unless this embodiment otherwise indicates or is otherwise clearly contradictory to the context. The processes described in this embodiment (or variations and / or combinations thereof) can be executed under the control of one or more computer systems configured with executable instructions, and can be implemented as code (e.g., executable instructions, one or more computer programs, or one or more applications) executed jointly on one or more processors, by hardware, or a combination thereof. The computer program includes a plurality of instructions executable by one or more processors.

[0070] Furthermore, the method can be implemented in any type of computing platform operably connected, including but not limited to personal computers, minicomputers, mainframes, workstations, network or distributed computing environments, separate or integrated computer platforms, or communicating with charged particle tools or other imaging devices, etc. Aspects of the present invention can be implemented in machine-readable code stored on a non-transitory storage medium or device, whether removable or integrated into the computing platform, such as a hard disk, optical read and / or write storage medium, RAM, ROM, etc., such that it can be read by a programmable computer and, when the storage medium or device is read by the computer, can be used to configure and operate the computer to execute the processes described herein. In addition, the machine-readable code, or portions thereof, can be transmitted via a wired or wireless network. When such media include instructions or programs that implement the above-described steps in conjunction with a microprocessor or other data processor, the invention described in this embodiment includes these and other different types of non-transitory computer-readable storage media. When programmed according to the methods and techniques of the present invention, the present invention also includes the computer itself.

[0071] A computer program can be applied to input data to perform the functions described in this embodiment, thereby converting the input data to generate output data stored in a non-volatile memory. The output information can also be applied to one or more output devices such as a display. In a preferred embodiment of the present invention, the converted data represents physical and tangible objects, including a specific visual depiction of the physical and tangible objects generated on the display.

[0072] As described above, it is only a preferred embodiment of the present invention. The present invention is not limited to the above embodiments. As long as it achieves the technical effects of the present invention by the same means, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the scope of protection of the present invention. Within the scope of protection of the present invention, its technical solutions and / or implementation manners can have various different modifications and changes.

Claims

1. A dual-circularly polarized co-aperture transmit-receive simultaneous antenna, characterized in that, The co-aperture transmit-receive simultaneous antenna includes: A dielectric substrate; the dielectric substrate includes an upper surface and a lower surface opposite to each other; An electromagnetic bandgap array; the electromagnetic bandgap array is disposed on the upper surface; the electromagnetic bandgap array includes a first electromagnetic bandgap sub-array, a second electromagnetic bandgap sub-array, a third electromagnetic bandgap sub-array, and a fourth electromagnetic bandgap sub-array; the extending directions of the first electromagnetic bandgap sub-array, the second electromagnetic bandgap sub-array, the third electromagnetic bandgap sub-array, and the fourth electromagnetic bandgap sub-array divide the dielectric substrate into a first region, a second region, a third region, and a fourth region; A sequential rotation array; the sequential rotation array is disposed on the upper surface; the sequential rotation array includes a first microstrip patch unit, a second microstrip patch unit, a third microstrip patch unit, and a fourth microstrip patch unit; the first microstrip patch unit is located in the first region, the second microstrip patch unit is located in the second region, the third microstrip patch unit is located in the third region, and the fourth microstrip patch unit is located in the fourth region; The lower surface is provided with a metal ground, and the metal ground forms an annular defected ground array; the annular defected ground array includes a first annular defected ground sub-array, a second annular defected ground sub-array, a third annular defected ground sub-array, and a fourth annular defected ground sub-array; the first annular defected ground sub-array is located in the first region, the second annular defected ground sub-array is located in the second region, the third annular defected ground sub-array is located in the third region, and the fourth annular defected ground sub-array is located in the fourth region; the projection of the first annular defected ground sub-array surrounds the first microstrip patch unit, the projection of the second annular defected ground sub-array surrounds the second microstrip patch unit, the projection of the third annular defected ground sub-array surrounds the third microstrip patch unit, and the projection of the fourth annular defected ground sub-array surrounds the fourth microstrip patch unit.

2. The dual-circularly polarized co-aperture transmit-receive simultaneous antenna according to claim 1, wherein The first electromagnetic bandgap sub-array, the second electromagnetic bandgap sub-array, the third electromagnetic bandgap sub-array, and the fourth electromagnetic bandgap sub-array respectively include a plurality of electromagnetic bandgap units, and the electromagnetic bandgap units in the same electromagnetic bandgap sub-array are arranged along a straight line direction.

3. The dual-circularly polarized co-aperture transmit-receive simultaneous antenna according to claim 2, wherein The electromagnetic bandgap unit is a square metal patch, a metal column is arranged at the center of the electromagnetic bandgap unit, and the metal column passes through the dielectric substrate and is connected to the metal ground; the electromagnetic bandgap unit is provided with a plurality of slits, and each slit radiates from around the metal column to the periphery of the electromagnetic bandgap unit.

4. The dual-circularly polarized co-aperture transmit-receive simultaneous antenna according to claim 1, characterized in that, The first annular defected ground sub-array, the second annular defected ground sub-array, the third annular defected ground sub-array, and the fourth annular defected ground sub-array respectively include a plurality of annular defected ground units, and the annular defected ground units in the same annular defected ground sub-array are sequentially connected end to end to form a circle.

5. The dual-circularly polarized co-aperture transmit-receive simultaneous antenna according to claim 4, wherein The annular defected ground unit includes a first circular slit, a second circular slit, and an arc-shaped slit, the first circular slit is located at the head end of the arc-shaped slit, and the second circular slit is located at the tail end of the arc-shaped slit; The arc-shaped slots respectively pass through the centers of the first circular slot and the second circular slot, without passing out of the first circular slot or the second circular slot.

6. The dual-circularly polarized co-aperture transmit-receive simultaneous antenna according to claim 4, wherein The first microstrip patch unit, the second microstrip patch unit, the third microstrip patch unit, and the fourth microstrip patch unit are all square metal patches; The first microstrip patch unit is provided with a first port and a second port, the second microstrip patch unit is provided with a third port and a fourth port, the third microstrip patch unit is provided with a fifth port and a sixth port, and the fourth microstrip patch unit is provided with a seventh port and an eighth port.

7. The co-aperture simultaneous transmit and receive antenna with dual circular polarization according to claim 6, wherein: The line connecting the first port to the center of the first microstrip patch unit and the line connecting the second port to the center of the first microstrip patch unit form a right angle; the line connecting the third port to the center of the second microstrip patch unit and the line connecting the fourth port to the center of the second microstrip patch unit form a right angle; the line connecting the fifth port to the center of the third microstrip patch unit and the line connecting the sixth port to the center of the third microstrip patch unit form a right angle; the line connecting the seventh port to the center of the fourth microstrip patch unit and the line connecting the eighth port to the center of the fourth microstrip patch unit form a right angle; The right angle formed by the first port and the second port is opposite to the right angle formed by the fifth port and the sixth port; the right angle formed by the third port and the fourth port is opposite to the right angle formed by the seventh port and the eighth port.

8. The dual-circularly polarized common-aperture transmit-receive simultaneous antenna according to claim 6 or 7, characterized in that, The co-aperture simultaneous transmit and receive antenna further includes: A transmit feeding network; the transmit feeding network is connected to the sequential rotation array; A receive feeding network; the receive feeding network is connected to the sequential rotation array.

9. The dual-circularly polarized co-aperture transmit-receive simultaneous antenna according to claim 8, wherein The transmit feeding network includes a first 90° hybrid, a first 180° hybrid, and a second 180° hybrid; The first 90° hybrid is respectively connected to the Diff port of the first 180° hybrid and the Sum port of the second 180° hybrid; The 0° port of the first 180° hybrid is connected to the first port, and the 180° port of the first 180° hybrid is connected to the third port; the 0° port of the second 180° hybrid is connected to the fifth port, and the 180° port of the second 180° hybrid is connected to the seventh port.

10. The dual-circularly polarized co-aperture transmit-receive simultaneous antenna according to claim 9, wherein The receive feeding network includes a second 90° hybrid, a third 180° hybrid, and a fourth 180° hybrid; The first 90° hybrid is respectively connected to the Diff port of the third 180° hybrid and the Sum port of the fourth 180° hybrid; The 0° port of the third 180° hybrid is connected to the second port, and the 180° port of the third 180° hybrid is connected to the fourth port; the 0° port of the fourth 180° hybrid is connected to the sixth port, and the 180° port of the fourth 180° hybrid is connected to the eighth port.

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