A CTS antenna with two-dimensional sum and difference beam scanning function

Abstract

This invention discloses a CTS antenna with two-dimensional sum-difference beamforming capability, comprising: a two-dimensional sum-difference beamforming network and a CTS array disposed in close contact with the two-dimensional sum-difference beamforming network; the two-dimensional sum-difference beamforming network includes a first dielectric substrate, a second dielectric substrate disposed in close contact with the first dielectric substrate, and a third dielectric substrate and a fourth dielectric substrate integrally connected to the second dielectric substrate respectively; the CTS array includes a fifth dielectric substrate disposed in close contact with the second dielectric substrate and a sixth dielectric substrate disposed in close contact with the fifth dielectric substrate; a first feed port is provided at one edge of the first dielectric substrate, a second feed port is provided on one side of the first feed port, a third feed port is provided opposite to the first feed port, and a fourth feed port is provided on one side of the third feed port. According to this invention, the antenna array has an overall planar structure, low profile, small size, and is easy to integrate with other modules, facilitating the miniaturization design of the system. The antenna requires no additional assembly process, which is more conducive to mass production.

Description

Technical Field

[0001] This invention relates to the field of antenna technology, and in particular to a CTS antenna with two-dimensional sum-difference beam scanning function. Background Technology

[0002] Monopulse radar can acquire the azimuth and range information of a target within a single pulse cycle. It boasts precise positioning and strong anti-jamming capabilities, making it a highly efficient and accurate tracking and directional radar. As a key component of a monopulse radar system, the monopulse antenna directly affects the radar's performance. Furthermore, compared to fixed-beam radars that rely on servo systems for mechanical scanning, radars using antennas with beam scanning capabilities offer advantages such as lower profile, faster scanning speed, and shorter response time.

[0003] As a crucial component of monopulse antennas, the performance of the sum-difference beam network directly impacts the radar's tracking and direction-finding capabilities. Currently, commonly used sum-difference beam networks are primarily based on metallic waveguides and microstrip line structures. The former is bulky, hindering the miniaturization and weight reduction of radar systems, while the latter typically requires a separate shielding cavity for electromagnetic shielding, increasing structural complexity and limiting system integration. Furthermore, due to the limitations of the sum-difference beam network's structure and function, most existing monopulse antennas can only achieve one-dimensional sum-difference beam scanning, while monopulse antennas with two-dimensional sum-difference beams struggle to achieve beam scanning. Traditional monopulse radars often employ reflector antennas, metallic waveguide slot antennas, lens antennas, etc. While these antennas offer good performance, their complex structure, large size, heavy weight, and difficulty in integrating with other planar circuits hinder the lightweighting and cost reduction of radar systems. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a CTS antenna with two-dimensional sum-difference beam scanning capability. The antenna array has a planar structure with a low profile and small size, facilitating integration with other modules and promoting system miniaturization. The antenna is fabricated using PCB technology, eliminating the need for additional assembly processes and further promoting mass production. To achieve the above-mentioned objectives and other advantages of the present invention, a CTS antenna with two-dimensional sum-difference beam scanning capability is provided, comprising:

[0005] A two-dimensional sum-difference beamforming network and a CTS array disposed in close proximity to the two-dimensional sum-difference beamforming network;

[0006] The two-dimensional sum-difference beamforming network includes a first dielectric substrate, a second dielectric substrate attached to the first dielectric substrate, and a third and a fourth dielectric substrate that are integrally connected to the second dielectric substrate respectively.

[0007] The CTS array includes a fifth dielectric substrate disposed in close contact with the second dielectric substrate and a sixth dielectric substrate disposed in close contact with the fifth dielectric substrate;

[0008] A first power supply port, a second power supply port located on one side of the first power supply port, a third power supply port located opposite to the first power supply port, and a fourth power supply port located on one side of the third power supply port are provided at one edge of the first dielectric substrate. A first bent SIW and a second bent SIW located side by side are provided between the third power supply port and the first power supply port.

[0009] The second medium board is provided with a first power divider, a second power divider disposed opposite to the first power divider, and a third and fourth bent SIWs, both of which are connected to the second power divider.

[0010] Preferably, the first power supply port and the second power supply port are connected to the first power divider through the first coupling power supply gap and the second coupling power supply gap, respectively;

[0011] The third power supply port and the fourth power supply port are respectively connected to the second power divider through the third coupling power supply gap and the fourth coupling power supply gap.

[0012] Preferably, the first power divider is connected to the first bent SIW and the second bent SIW through the first coupling gap and the second coupling gap, respectively;

[0013] The second power divider is connected to the third and fourth bend SIWs.

[0014] Preferably, a third coupling gap and a fourth coupling gap are respectively opened on the first bending SIW and the second bending SIW, and a fifth coupling gap, a sixth coupling gap, a seventh coupling gap and an eighth coupling gap are respectively opened on both sides of the first bending SIW and the second bending SIW.

[0015] Preferably, a first output port and a second output port are disposed on the second dielectric board between the first power divider and the second power divider. The first bent SIW and the second bent SIW are respectively connected to the first output port and the second output port through the third coupling gap and the fourth coupling gap. The third bent SIW is connected to the first output port through the fifth coupling gap and the seventh coupling gap, and the fourth bent SIW is connected to the second output port through the sixth coupling gap and the eighth coupling gap.

[0016] Preferably, a first SIW reflective surface and a second SIW reflective surface are respectively provided on the third dielectric plate and the fourth dielectric plate, and a first parabolic coupling slot and a second parabolic coupling slot are respectively opened on one side of the first SIW reflective surface and the other side of the second SIW reflective surface.

[0017] Preferably, the fifth dielectric substrate is provided with a third SIW reflective surface corresponding to the first SIW reflective surface and a fourth SIW reflective surface corresponding to the second SIW reflective surface.

[0018] Preferably, the sixth dielectric substrate is provided with a first radiation array and a second radiation array, and the fifth dielectric substrate is provided with a first radiation slot and a second radiation slot respectively corresponding to the first radiation array and the second radiation array.

[0019] Compared with existing technologies, the advantages of this invention are as follows: The antenna has four independent feed ports, each corresponding to the sum or difference beam in the xoz and yoz planes. By translating the dielectric substrate with the feed ports along its long side, the antenna can achieve two-dimensional sum and difference beam scanning. The antenna uses slot-coupled feeding via SIW, improving the isolation between the feed ports. The antenna's two-dimensional sum and difference beam network design based on SIW has excellent electromagnetic shielding characteristics, effectively suppressing interlayer crosstalk without requiring a separate shielding cavity for electromagnetic shielding. The antenna uses PCB fabrication technology, eliminating the need for additional assembly processes and facilitating mass production. The linear array has a planar structure with a low profile and small volume, making it easy to integrate with other modules. This allows for effective control of the overall system's profile height, weight, and volume, facilitating miniaturization design. Attached Figure Description

[0020] Figure 1 A three-dimensional exploded view of the CTS antenna with two-dimensional sum-difference beam scanning function according to the present invention;

[0021] Figure 2 A top view of the first dielectric substrate of the CTS antenna with two-dimensional sum-difference beam scanning function according to the present invention;

[0022] Figure 3 This is a top view of the second, third, and fourth dielectric substrates of the CTS antenna with two-dimensional sum-difference beam scanning function according to the present invention.

[0023] Figure 4 A top view of the fifth dielectric substrate of the CTS antenna with two-dimensional sum-difference beam scanning function according to the present invention;

[0024] Figure 5 This is a top view of the sixth dielectric substrate of the CTS antenna with two-dimensional sum and difference beam scanning function according to the present invention. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Reference Figure 1-5 A CTS antenna with two-dimensional sum-difference beamforming function includes: a two-dimensional sum-difference beamforming network and a CTS array disposed in close contact with the two-dimensional sum-difference beamforming network;

[0027] The two-dimensional sum-difference beamforming network includes a first dielectric substrate 101, a second dielectric substrate 201 disposed in contact with the first dielectric substrate 101, and a third dielectric substrate 202 and a fourth dielectric substrate 203 respectively integrally connected to the second dielectric substrate 201;

[0028] The CTS array includes a fifth dielectric substrate 301 disposed in close contact with the second dielectric substrate 201 and a sixth dielectric substrate 401 disposed in close contact with the fifth dielectric substrate 301;

[0029] A first power supply port 111, a second power supply port 112 disposed on one side of the first power supply port 111, a third power supply port 113 disposed opposite to the first power supply port 111, and a fourth power supply port 114 disposed on one side of the third power supply port 113 are provided at one edge of the first dielectric substrate 101. The first power supply port 111 and the third power supply port 113 are used to excite the TE20 mode, and the second power supply port 112 and the fourth power supply port 114 are used to excite the TE10 mode. When the first power supply port 111 is excited, in the xoz and yoz planes... All generate a sum beam. When the second feed port 112 is excited, a difference beam and a sum beam are generated in the xoz and yoz planes, respectively. When the third feed port 113 is excited, a sum beam and a difference beam are generated in the xoz and yoz planes, respectively. When the fourth feed port 114 is excited, a difference beam is generated in both the xoz and yoz planes. A first bend SIW 115 and a second bend SIW 116 arranged side by side are provided between the third feed port 113 and the first feed port 111.

[0030] The second dielectric board 201 is provided with a first power divider 211, a second power divider 212 disposed opposite to the first power divider 211, and a second power divider 212 and a fourth bend SIW 214 both connected to the second power divider 212. The first power divider 211 and the second power divider 212 divide the input signal into two paths of equal amplitude.

[0031] This antenna can be used as an antenna for monopulse radar and other radars. It features four independent feed ports: a first feed port 111, a second feed port 112, a third feed port 113, and a fourth feed port 114. Each feed port corresponds to a sum or difference beam in the xoz and yoz planes, respectively. Two-dimensional sum and difference beam scanning can be achieved by translating the dielectric substrate with the feed ports along its long side. Based on a SIW structure, the antenna can be fabricated using PCB technology, offering advantages such as low cost and ease of integration with other planar circuits.

[0032] Furthermore, the first power supply port 111 and the second power supply port 112 are respectively connected to the first power divider 211 through the first coupling power supply gap 117 and the second coupling power supply gap 118;

[0033] The third power supply port 113 and the fourth power supply port 114 are respectively connected to the second power divider 212 through the third coupling power supply gap 119 and the fourth coupling power supply gap 120.

[0034] Furthermore, the first power divider 211 is connected to the first bent SIW 115 and the second bent SIW 116 through the first coupling gap 121 and the second coupling gap 122, respectively.

[0035] The second power divider 212 is connected to the third bend SIW 213 and the fourth bend SIW 214.

[0036] Furthermore, a third coupling gap 123 and a fourth coupling gap 124 are respectively provided on the first bend SIW115 and the second bend SIW116, and a fifth coupling gap 125, a sixth coupling gap 126, a seventh coupling gap 127 and an eighth coupling gap 128 are respectively provided on both sides of the first bend SIW115 and the second bend SIW116.

[0037] Furthermore, a first output port 215 and a second output port 216 are provided on the second dielectric substrate 201 between the first power divider 211 and the second power divider 212. The first bent SIW 115 and the second bent SIW 116 are respectively connected to the first output port 215 and the second output port 216 through the third coupling gap 123 and the fourth coupling gap 124. The third bent SIW 213 is connected to the first output port 215 through the fifth coupling gap 125 and the seventh coupling gap 127, and the fourth bent SIW 214 is connected to the second output port 216 through the sixth coupling gap 126 and the eighth coupling gap 128.

[0038] Furthermore, the third dielectric substrate 202 and the fourth dielectric substrate 203 are respectively provided with a first SIW reflector 217 and a second SIW reflector 218 to convert the quasi-cylindrical waves generated by the first output port 215 and the second output port 216 into quasi-plane waves. A first parabolic coupling slot 219 and a second parabolic coupling slot 220 are respectively opened on one side of the first SIW reflector 217 and the other side of the second SIW reflector 218 to couple the quasi-plane waves from the third dielectric substrate 202 and the fourth dielectric substrate 203 to the fifth dielectric substrate 301.

[0039] Furthermore, the fifth dielectric plate 301 is provided with a third SIW reflective surface 311 corresponding to the first SIW reflective surface 217 and a fourth SIW reflective surface 312 corresponding to the second SIW reflective surface 218.

[0040] Furthermore, the sixth dielectric plate 401 is provided with a first radiation array 411 and a second radiation array 412 to radiate electromagnetic energy into free space, and the fifth dielectric plate 301 is provided with a first radiation slot 313 and a second radiation slot 314 corresponding to the first radiation array 411 and the second radiation array 412, respectively.

[0041] The number of devices and processing scale described herein are for the purpose of simplifying the description of the invention, and applications, modifications and variations thereof will be apparent to those skilled in the art.

[0042] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A CTS antenna with two-dimensional sum-difference beam scanning function, characterized in that, include: A two-dimensional sum-difference beamforming network and a CTS array disposed in close proximity to the two-dimensional sum-difference beamforming network; The two-dimensional sum-difference beamforming network includes a first dielectric plate (101), a second dielectric plate (201) disposed in contact with the first dielectric plate (101), and a third dielectric plate (202) and a fourth dielectric plate (203) integrally connected to the second dielectric plate (201). The third dielectric plate (202) and the fourth dielectric plate (203) are respectively provided with a first SIW reflective surface (217) and a second SIW reflective surface (218), and a first parabolic coupling slot (219) and a second parabolic coupling slot (220) are respectively opened on one side of the first SIW reflective surface (217) and the second SIW reflective surface (218). The CTS array includes a fifth dielectric plate (301) disposed in close contact with the second dielectric plate (201) and a sixth dielectric plate (401) disposed in close contact with the fifth dielectric plate (301). The fifth dielectric plate (301) is provided with a third SIW reflective surface (311) corresponding to the first SIW reflective surface (217) and a fourth SIW reflective surface (312) corresponding to the second SIW reflective surface (218). A first power supply port (111), a second power supply port (112) disposed on one side of the first power supply port (111), a third power supply port (113) disposed opposite to the first power supply port (111), and a fourth power supply port (114) disposed on one side of the third power supply port (113) are provided at one side of the first power supply port (113). A first bent SIW (115) and a second bent SIW (116) disposed side by side with the first bent SIW (115) are provided between the third power supply port (113) and the first power supply port (111). The second medium plate (201) is provided with a first power divider (211), a second power divider (212) disposed opposite to the first power divider (211), and a third bent SIW (213) and a fourth bent SIW (214) both connected to the second power divider (212).

2. A CTS antenna with two-dimensional sum-difference beam scanning function as described in claim 1, characterized in that, The first power supply port (111) and the second power supply port (112) are connected to the first power divider (211) through the first coupling power supply gap (117) and the second coupling power supply gap (118), respectively. The third power supply port (113) and the fourth power supply port (114) are connected to the second power divider (212) through the third coupling power supply gap (119) and the fourth coupling power supply gap (120), respectively.

3. A CTS antenna with two-dimensional sum-difference beam scanning function as described in claim 2, characterized in that, The first power divider (211) is connected to the first bent SIW (115) and the second bent SIW (116) through the first coupling gap (121) and the second coupling gap (122), respectively; The second power divider (212) is connected to the third bent SIW (213) and the fourth bent SIW (214).

4. A CTS antenna with two-dimensional sum-difference beam scanning function as described in claim 3, characterized in that, A third coupling gap (123) and a fourth coupling gap (124) are respectively provided on the first bent SIW (115) and the second bent SIW (116), and a fifth coupling gap (125), a sixth coupling gap (126), a seventh coupling gap (127) and an eighth coupling gap (128) are respectively provided on both sides of the first bent SIW (115) and the second bent SIW (116).

5. A CTS antenna with two-dimensional sum-difference beam scanning function as described in claim 4, characterized in that, On the second dielectric substrate (201), a first output port (215) and a second output port (216) are provided between the first power divider (211) and the second power divider (212). The first bent SIW (115) and the second bent SIW (116) are respectively connected to the first output port (215) and the second output port (216) through the third coupling gap (123) and the fourth coupling gap (124). The third bent SIW (213) is connected to the first output port (215) through the fifth coupling gap (125) and the seventh coupling gap (127). The fourth bent SIW (214) is connected to the second output port (216) through the sixth coupling gap (126) and the eighth coupling gap (128).

6. A CTS antenna with two-dimensional sum-difference beam scanning function as described in claim 1, characterized in that, The sixth dielectric plate (401) is provided with a first radiation array (411) and a second radiation array (412), and the fifth dielectric plate (301) is provided with a first radiation slot (313) and a second radiation slot (314) corresponding to the first radiation array (411) and the second radiation array (412), respectively.

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