A dual circular polarization sum-difference network

Abstract

The invention belongs to a sum-difference network. In order to solve the technical problem that in the existing sum-difference network structure, each module is connected by a cable, which increases the difficulty of debugging, a dual circular polarization sum-difference network is provided. The network comprises a first dielectric plate, a first adhesive plate, a second dielectric plate, a second adhesive plate, a third dielectric plate, a third adhesive plate and a fourth dielectric plate which are stacked in sequence. Both sides of the first dielectric plate, one side of the second dielectric plate close to the second adhesive plate, one side of the third dielectric plate close to the second adhesive plate and both sides of the fourth dielectric plate are printed with a metal grounding structure. A left-handed sum-difference network structure is printed on a surface of the second dielectric plate close to the first adhesive plate, and a right-handed sum-difference network structure is printed on a surface of the third dielectric plate close to the third adhesive plate. A feeding hole is provided in the left-handed sum-difference network structure on the second dielectric plate, and mutually interpenetrating feeding through holes are provided on the second adhesive plate, the third dielectric plate, the third adhesive plate and the fourth dielectric plate at positions corresponding to the feeding hole.

Description

Technical Field

[0001] The invention belongs to a sum-difference network, and in particular relates to a dual circular polarization sum-difference network. Background Art

[0002] In recent years, with the development of phased array related electronic systems, sum and difference network technology has also developed rapidly.

[0003] The sum-and-difference network is mainly composed of couplers, sum-and-differentiators, phase shifters, filters, etc. As a key component in the antenna field, it is used to complete signal power synthesis and distribution. In the existing technical solutions, the couplers, sum-and-differentiators, phase shifters, filters, etc. in the sum-and-differentiator network are all separate modules, and the modules are connected by cables. However, the cables have phase requirements, which increases the difficulty of debugging. Summary of the invention

[0004] The present invention provides a dual circular polarization sum-difference network to solve the technical problem that in the existing sum-difference network structure, each module is connected by a cable, which increases the difficulty of debugging.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A dual circular polarization sum-difference network, which is special in that it comprises a first dielectric plate, a first adhesive plate, a second dielectric plate, a second adhesive plate, a third dielectric plate, a third adhesive plate and a fourth dielectric plate which are stacked in sequence;

[0007] Metal grounding structures are printed on both sides of the first dielectric plate, one side of the second dielectric plate close to the second adhesive plate, one side of the third dielectric plate close to the second adhesive plate, and both sides of the fourth dielectric plate;

[0008] The surface of the second dielectric plate close to the first adhesive plate is printed with a left-handed sum-difference network structure;

[0009] The surface of the third dielectric plate close to the third adhesive plate is printed with a right-handed sum-difference network structure;

[0010] The first dielectric plate, the first adhesive plate, the second dielectric plate, the second adhesive plate, the third dielectric plate, the third adhesive plate and the fourth dielectric plate are all provided with connecting through holes at corresponding positions, and the connecting through holes are connected in sequence;

[0011] A feeding hole is provided in the left-handed sum-and-difference network structure on the second dielectric plate, and mutually penetrating feeding through holes are provided on the second adhesive plate, the third dielectric plate, the third adhesive plate and the fourth dielectric plate at positions corresponding to the feeding hole.

[0012] Further, the left-handed sum-difference network structure includes a first left-handed subnetwork structure, a second left-handed subnetwork structure, a third left-handed subnetwork structure, a fourth left-handed subnetwork structure, a first bridge, a second bridge, a third bridge and a fourth bridge;

[0013] The input ends of the first left-handed sub-network structure and the fourth left-handed sub-network structure are respectively connected to the two output ends of the first bridge, and the input ends of the second left-handed sub-network structure and the third left-handed sub-network structure are respectively connected to the two output ends of the second bridge;

[0014] One input end of the first bridge is connected to the output end of the third bridge corresponding to the azimuth difference input, and the other input end is connected to the output end of the fourth bridge corresponding to the pitch difference input through a sixth 90° phase shifter;

[0015] One input end of the second bridge is connected to the output end of the third bridge corresponding to the port input through the seventh 90° phase shifter, and the other input end is connected to the output end of the fourth bridge corresponding to the load input;

[0016] Feeding holes are provided in the four network units.

[0017] Further, the first left-handed sub-network structure, the second left-handed sub-network structure, the third left-handed sub-network structure and the fourth left-handed sub-network structure all include a fifth bridge, a sixth bridge, a seventh bridge, an eighth bridge, a first Wilkinson power divider, a second Wilkinson power divider and a third Wilkinson power divider, wherein the first left-handed sub-network structure and the second left-handed sub-network structure also include a first 90° phase shifter; one end of the first 90° phase shifter is the input end of the first left-handed sub-network structure or the second left-handed sub-network structure, and the other end is connected to the input end of the second Wilkinson power divider;

[0018] The two output ends of the second Wilkinson power divider are respectively connected to the input end of the first Wilkinson power divider and the input end of the third Wilkinson power divider;

[0019] The two output ends of the first Wilkinson power divider are respectively connected to an input end of the fifth bridge and an input end of the seventh bridge; the two output ends of the third Wilkinson power divider are respectively connected to an input end of the sixth bridge and an input end of the eighth bridge;

[0020] The feeding holes are respectively arranged at two output ends of the fifth bridge, two output ends of the sixth bridge, two output ends of the seventh bridge and two output ends of the eighth bridge.

[0021] Further, the first right-handed sub-network structure, the second right-handed sub-network structure, the third right-handed sub-network structure, the fourth right-handed sub-network structure, the ninth bridge, the tenth bridge, the eleventh bridge and the twelfth bridge;

[0022] The input ends of the third right-handed sub-network structure and the fourth right-handed sub-network structure are respectively connected to an output end of the ninth bridge and an output end of the tenth bridge;

[0023] The input end of the second right-handed sub-network structure is connected to another output end of the ninth bridge via a second 90° phase shifter, and the input end of the first right-handed sub-network structure is connected to another output end of the tenth bridge via a third 90° phase shifter;

[0024] One input end of the ninth bridge is connected to the output end of the eleventh bridge corresponding to the port input, and the other input end is connected to the output end of the twelfth bridge corresponding to the load input through a fourth 90° phase shifter;

[0025] One input end of the tenth bridge is connected to the output end of the eleventh bridge corresponding to the azimuth difference input through the fifth 90° phase shifter, and the other input end is connected to the output end of the twelfth bridge corresponding to the pitch difference input.

[0026] Further, the connecting through holes are respectively arranged at the other input ends of the fifth bridge, the sixth bridge, the seventh bridge and the eighth bridge;

[0027] A plurality of metallized through holes are arranged circumferentially outside each connecting through hole, and the metallized through holes penetrate the first dielectric plate, the first adhesive plate, the second dielectric plate, the second adhesive plate, the third dielectric plate, the third adhesive plate and the fourth dielectric plate, forming a coaxial structure with the connecting through hole.

[0028] Further, the first right-handed sub-network structure, the second right-handed sub-network structure, the third right-handed sub-network structure, and the fourth right-handed sub-network structure all include a fourth Wilkinson power divider, a fifth Wilkinson power divider, and a sixth Wilkinson power divider;

[0029] The fifth Wilkinson power divider input end in the second right-handed sub-network structure is connected to the second 90° phase shifter, the fifth Wilkinson power divider input end in the first right-handed sub-network structure is connected to the third 90° phase shifter, the fifth Wilkinson power divider input end in the third right-handed sub-network structure is connected to an output end of the ninth bridge, and the fifth Wilkinson power divider input end in the fourth right-handed sub-network structure is connected to an output end of the tenth bridge;

[0030] Two output ends of the fifth Wilkinson power divider are connected to input ends of the fourth Wilkinson power divider and the sixth Wilkinson power divider respectively;

[0031] The two output ends of the fourth Wilkinson power divider and the sixth Wilkinson power divider are electrically connected to the corresponding feeding through holes on the third dielectric plate respectively.

[0032] Furthermore, the isolation resistors of the first Wilkinson power divider, the second Wilkinson power divider, the third Wilkinson power divider, the fourth Wilkinson power divider, the fifth Wilkinson power divider and the sixth Wilkinson power divider all adopt a 0402 package size.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] 1. The dual circular polarization sum-difference network of the present invention is provided with a plurality of dielectric plates and a plurality of bonding plates, and the metal grounding structure, the left-handed sum-difference network structure and the right-handed sum-difference network structure are respectively arranged on the two sides of different dielectric plates, and a multi-level sum-difference network structure is formed by bonding plates, and the overall structure is compact, the integration is high, and the volume of the sum-difference network structure is reduced. At the same time, left-handed circular polarization and right-handed circular polarization can also be achieved, and it has strong practicality. In addition, the present invention adopts a stripline structure, and the top layer and the bottom layer are both provided with metal grounding structures, so that energy is not easily leaked during transmission, and at the same time, it is not easily affected by external interference.

[0035] 2. The dual circular polarization and difference network structure of the present invention has good symmetry, amplitude and phase consistency.

[0036] 3. The left-handed sum-difference network structure and the right-handed sum-difference network structure of the present invention both use Wilkinson power dividers, which improve the isolation between ports, increase the working bandwidth, and solve the shortcomings of T-junction power dividers that cannot match all ports and have no isolation. In addition, the feed holes are flexible in spatial distribution as output ports, which can meet the application of more complex structural environments.

[0037] 4. The isolation resistors of all Wilkinson power dividers in the present invention adopt 0402 package size, which is small in size, easy to integrate, and easy to assemble.

[0038] 5. The left-handed sum-difference network structure uses connecting through holes at the circular polarizer, which plays a role of vertical transition and can connect each layer of the network. A circle of metallized through holes is provided around the connecting through holes, forming a coaxial structure with the connecting through holes, thus avoiding the impedance mismatch problem. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of the structure of the dual circular polarization sum-difference network of the present invention;

[0040] Figure 2 A schematic diagram of a left-handed sum-and-difference network structure in a dual circularly polarized sum-and-difference network embodiment of the present invention;

[0041] Figure 3 A schematic diagram of a right-handed sum-and-difference network structure in a dual circularly polarized sum-and-difference network embodiment of the present invention;

[0042] Figure 4A schematic diagram of an antenna array using a dual circular polarization sum-difference network of the present invention;

[0043] Figure 5 It is a schematic diagram of the principle of the dual circular polarization sum-difference network of the present invention;

[0044] Figure 6 It is a simulation diagram of the return loss of an antenna array using the dual circular polarization sum-difference network of the present invention;

[0045] Figure 7 It is a simulation diagram of insertion loss from the azimuth difference port to each port using the dual circular polarization sum-difference network of the present invention;

[0046] Figure 8 A phase characteristic curve diagram from the azimuth difference port to each port using the dual circular polarization sum-difference network of the present invention;

[0047] Fig. 9 It is a simulation diagram of insertion loss from the sum port to each port of the dual circular polarization sum-difference network of the present invention;

[0048] Fig.10 A phase characteristic curve diagram from the sum port to each port of the dual circular polarization sum-difference network of the present invention;

[0049] Fig.11 It is a simulation diagram of insertion loss from the elevation difference port to each port using the dual circular polarization sum-difference network of the present invention;

[0050] Fig.12 A phase characteristic curve diagram from the elevation difference port to each port using the dual circular polarization sum-difference network of the present invention;

[0051] Fig.13 The antenna array using the dual circular polarization sum-difference network of the present invention simulates the left-hand azimuth and difference beam pattern of the antenna at 2.25 GHz;

[0052] Fig.14 Simulated directional pattern of antenna left-hand pitch and difference beams at 2.25 GHz for an antenna array using the dual circular polarization and difference network of the present invention;

[0053] Fig.15 The antenna array using the dual circular polarization sum-difference network of the present invention simulates the antenna right-hand azimuth and difference beam pattern at 2.25 GHz;

[0054] Fig.16 The invention provides a right-hand pitch and difference beam simulation pattern of an antenna array using the dual circular polarization and difference network of the present invention at 2.25 GHz.

[0055] Wherein: 1-first dielectric plate, 2-second dielectric plate, 3-third dielectric plate, 4-fourth dielectric plate, 5-first adhesive plate, 6-second adhesive plate, 7-third adhesive plate, 8-first left-handed subnetwork structure, 9-first bridge, 10-second bridge, 11-third bridge, 12-fourth bridge, 13-fifth bridge, 14-sixth bridge, 15-seventh bridge, 16-eighth bridge, 17-first Wilkinson power divider, 18-second Wilkinson power divider, 19-third Wilkinson power divider, 20-first 90° phase shifter, 21-feeding hole, 22-ninth bridge, 23-tenth bridge, 24-eleventh bridge, 25-twelfth bridge, 26-fourth 90° phase shifter, 27-fifth 90° phase shifter, 28-second 90° phase shifter, 29-third 90° phase shifter, 30-seventh 90° phase shifter, 31-fourth Wilkinson power divider, 32-fifth Wilkinson power divider, 33-sixth Wilkinson power divider, 34-first right-handed sub-network structure, 35-sixth 90° phase shifter, 36-metal grounding structure, 37-left-handed sum and difference network structure, 38-right-handed sum and difference network structure, 39-second left-handed sub-network structure, 40-third left-handed sub-network structure, 41-fourth left-handed sub-network structure, 42-second right-handed sub-network structure, 43-third right-handed sub-network structure, 44-fourth right-handed sub-network structure. DETAILED DESCRIPTION

[0056] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0057] like Figure 1 As shown, the present invention provides a dual circular polarization sum-difference network of a strip line, comprising a first dielectric plate 1, a first adhesive plate 5, a second dielectric plate 2, a second adhesive plate 6, a third dielectric plate 3, a third adhesive plate 7 and a fourth dielectric plate 4 which are stacked in sequence. Metal grounding structures 36 are printed on both sides of the first dielectric plate 1, on one side of the second dielectric plate 2 close to the second adhesive plate 6, on one side of the third dielectric plate 3 close to the second adhesive plate 6, and on both sides of the fourth dielectric plate 4.

[0058] The surface of the second dielectric plate 2 close to the first adhesive plate 5 is printed with a left-handed sum-difference network structure 37. Figure 2As shown, the left-handed sum-difference network structure 37 includes a first left-handed sub-network structure 8, a second left-handed sub-network structure 39, a third left-handed sub-network structure 40, a fourth left-handed sub-network structure 41, a first bridge 9, a second bridge 10, a third bridge 11 and a fourth bridge 12. The first left-handed sub-network structure 8, the second left-handed sub-network structure 39, the third left-handed sub-network structure 40 and the fourth left-handed sub-network structure 41 all include a fifth bridge 13, a sixth bridge 14, a seventh bridge 15, an eighth bridge 16, a first Wilkinson power divider 17, a second Wilkinson power divider 18 and a third Wilkinson power divider 19, wherein the first left-handed sub-network structure 8 and the second left-handed sub-network structure 39 also include a first 90° phase shifter 20. One end of the first 90° phase shifter 20 is the input end of the first left-handed sub-network structure 8 or the second left-handed sub-network structure 39, and the other end is connected to the input end of the second Wilkinson power divider 18. The two output ends of the second Wilkinson power divider 18 are respectively connected to the input end of the first Wilkinson power divider 17 and the input end of the third Wilkinson power divider 19. The two output ends of the first Wilkinson power divider 17 are respectively connected to an input end of the fifth bridge 13 and an input end of the seventh bridge 15; the two output ends of the third Wilkinson power divider 19 are respectively connected to an input end of the sixth bridge 14 and an input end of the eighth bridge 16. A plurality of feeding holes 21 are respectively arranged at the two output ends of the fifth bridge 13, the two output ends of the sixth bridge 14, the two output ends of the seventh bridge 15, and the two output ends of the eighth bridge 16.

[0059] The input ends of the first left-handed sub-network structure 8 and the fourth left-handed sub-network structure 41 are respectively connected to the two output ends of the first bridge 9, and the input ends of the second left-handed sub-network structure 39 and the third left-handed sub-network structure 40 are respectively connected to the two output ends of the second bridge 10. One input end of the first bridge 9 is connected to the output end of the third bridge 11 corresponding to the azimuth difference input, and the other input end is connected to the output end of the fourth bridge 12 corresponding to the pitch difference input through the sixth 90° phase shifter 35. One input end of the second bridge 10 is connected to the output end of the third bridge 11 corresponding to the port input through the seventh 90° phase shifter 30, and the other input end is connected to the output end of the fourth bridge 12 corresponding to the load input.

[0060] The surface of the third dielectric plate 3 close to the third adhesive plate 7 is printed with a right-handed sum-difference network structure 38. Figure 3As shown, the right-handed sum and difference network structure 38 includes a first right-handed sub-network structure 34, a second right-handed sub-network structure 42, a third right-handed sub-network structure 43, a fourth right-handed sub-network structure 44, a ninth bridge 22, a tenth bridge 23, an eleventh bridge 24 and a twelfth bridge 25. The first right-handed sub-network structure 34, the second right-handed sub-network structure 42, the third right-handed sub-network structure 43, and the fourth right-handed sub-network structure 44 all include a fourth Wilkinson power divider 31, a fifth Wilkinson power divider 32 and a sixth Wilkinson power divider 33. The input end of the fifth Wilkinson power divider 32 in the second right-handed sub-network structure 42 is connected to the second 90° phase shifter 28, the input end of the fifth Wilkinson power divider 32 in the first right-handed sub-network structure 34 is connected to the third 90° phase shifter 29, the input end of the fifth Wilkinson power divider 32 in the third right-handed sub-network structure 43 is connected to an output end of the ninth bridge 22, the input end of the fifth Wilkinson power divider 32 in the fourth right-handed sub-network structure 44 is connected to an output end of the tenth bridge 23, the two output ends of the fifth Wilkinson power divider 32 are respectively connected to the input ends of the fourth Wilkinson power divider 31 and the sixth Wilkinson power divider 33, and the two output ends of the fourth Wilkinson power divider 31 and the sixth Wilkinson power divider 33 are respectively electrically connected to the corresponding feeding through holes on the third dielectric plate 3.

[0061] The input ends of the third right-handed sub-network structure 43 and the fourth right-handed sub-network structure 44 are respectively connected to an output end of the ninth bridge 22 and an output end of the tenth bridge 23, the input end of the second right-handed sub-network structure 42 is connected to the other output end of the ninth bridge 22 through the second 90° phase shifter 28, the input end of the first right-handed sub-network structure 34 is connected to the other output end of the tenth bridge 23 through the third 90° phase shifter 29, one input end of the ninth bridge 22 is connected to the output end of the eleventh bridge 24 corresponding to the port input, and the other input end is connected to the output end of the twelfth bridge 25 corresponding to the load input through the fourth 90° phase shifter 26, one input end of the tenth bridge 23 is connected to the output end of the eleventh bridge 24 corresponding to the azimuth difference input through the fifth 90° phase shifter 27, and the other input end is connected to the output end of the twelfth bridge 25 corresponding to the pitch difference input.

[0062] The first dielectric plate 1, the first adhesive plate 5, the second dielectric plate 2, the second adhesive plate 6, the third dielectric plate 3, the third adhesive plate 7 and the fourth dielectric plate 4 are all provided with connecting through holes, and the connecting through holes are sequentially connected. The second adhesive plate 6, the third dielectric plate 3, the third adhesive plate 7 and the fourth dielectric plate 4 are all provided with feeding through holes that are connected to each other at positions corresponding to the feeding holes 21.

[0063] like Figure 4As shown, the dual circular polarization sum-difference network is connected to a 4*4 unit antenna array to build an antenna. Among them, the materials of the first dielectric plate 1, the second dielectric plate 2, the third dielectric plate 3 and the fourth dielectric plate 4 are all Rogers 5880, with a relative dielectric constant of 2.2 and a thickness of 0.508mm. The first adhesive plate 5, the second adhesive plate 6 and the third adhesive plate 7 are all made of FR4 material, with a relative dielectric constant of 4.4 and a thickness of 0.1mm. The isolation resistors of all Wilkinson power dividers are packaged in 0402 size. By slotting the front and back sides of the PCB board, the resistors can be directly welded in the slots. Among them, A1, A2, A3, and A4 form a small array in area A, B1, B2, B3, and B4 form a small array in area B, C1, C2, C3, and C4 form a small array in area C, and D1, D2, D3, and D4 form a small array in area D. Areas A, B, C, and D correspond to the first left-handed subnetwork structure 8, the second left-handed subnetwork structure 39, the third left-handed subnetwork structure 40, and the fourth left-handed subnetwork structure 41, respectively. When building the antenna, an aluminum plate is installed at the bottom of the fourth dielectric plate 4, and an antenna array is set on the surface of the aluminum plate away from the fourth dielectric plate 4. For example, in the small array in area A, A1, A2, A3, and A4 are respectively connected to the feeding holes 21 at the two output ends of the fifth bridge 13, the sixth bridge 14, the seventh bridge 15, and the eighth bridge 16 in the first left-handed subnetwork structure 8 through probes. Figure 5 As shown, when A, B, C, and D are input ports, they pass through four independent branches, combined with a 90° phase shifter and a bridge, and are output from the four ports M, N, P, and Q respectively. The sum port is (A+B+C+D), the azimuth difference is (A+C)-(B+D), the elevation difference is (A+B)-(C+D), and the load is (B+C)-(A+D). It can be seen that the output from the M port is the superposition of four signals, the output from the N port is the phase difference between the sum signal in the azimuth plane, the output from the P port is the phase difference between the sum signal in the elevation plane, and the signal obtained from the Q port has no practical meaning. It is generally used to connect a matching load to absorb excess power when it is not fully matched.

[0064] The antenna of the above embodiment is simulated by using Ansoft HFSS software, and the Figures 6 to 12 The simulation results are shown, where 17 represents the azimuth difference port, 18 represents the sum port, 19 represents the elevation difference port, A1 and A2 are two feeding points of any circular polarizer in area A, with a phase difference of 90°, B1 and B2 are two feeding points of any circular polarizer in area B, with a phase difference of 90°, C1 and C2 are two feeding points of any circular polarizer in area C, with a phase difference of 90°, and D1 and D2 are two feeding points of any circular polarizer in area D, with a phase difference of 90°. Figure 6The return loss of each port is shown. It can be seen that within the 2.2GHz-2.3GHz bandwidth, the return loss is less than -13dB, achieving good port matching. Figure 7 is the insertion loss from the azimuth difference port to each port. It can be seen that within the frequency band, the insertion loss from the azimuth difference port to each port is around -17dB, and the imbalance is within 1dB. Figure 8 This is the phase characteristic curve from the azimuth difference port to each port. It can be seen that within the frequency band, the output signals of area A and area C always remain in phase and have good phase consistency. The output signals of area B and area D always remain in phase and have good phase consistency. The outputs of area A and area C and area B and area D are strictly reversed. Fig. 9 The insertion loss diagram from the sum port to each port shows that within the frequency band, the insertion loss from the sum port to each port is around -17dB, and the imbalance is within 1dB. Fig.10 It is the phase characteristic curve diagram from the sum port to each port. It can be seen that within the working frequency band, the output signals of A1, B1, C1, and D1 always remain in phase, the output signals of A2, B2, C2, and D2 always remain in phase, and the phase difference between the two groups of signals is 90 degrees. Fig.11 FIG. 1 is the insertion loss diagram from the elevation difference port to each port. It can be seen that within the working bandwidth, the insertion loss from the elevation difference port to each port is around -17dB, and the imbalance is within 1dB. Fig.12 This is the phase characteristic curve from the pitch difference port to each port. It can be seen that within the working bandwidth, the output signals of area A and area B always remain in phase and have good phase consistency. The output signals of area C and area D always remain in phase and have good phase consistency. The outputs of area A, area B and area C, and area D are strictly reversed. Fig.13 The simulation results of the left-hand azimuth and difference beam patterns of the antenna at 2.25 GHz show that the gain of the sum pattern can reach about 20 dB, and the zero depth of the difference pattern is less than -20 dB. Fig.14 The simulation results of the left-hand pitch and difference beam patterns of the antenna at 2.25GHz show that the gain of the sum pattern can reach about 20dB, and the zero depth of the difference pattern is less than -20dB. Fig.15 The simulation results of the right-hand azimuth and difference beam patterns of the antenna at 2.25 GHz show that the gain of the sum pattern can reach about 20 dB, and the zero depth of the difference pattern is less than -20 dB. Fig.16 The simulation results of the right-hand pitch and difference beam patterns of the antenna at 2.25GHz show that the gain of the sum pattern can reach about 20dB, and the zero depth of the difference pattern is less than -20dB.

[0065] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A dual circular polarization sum-difference network, characterized in that: It comprises a first dielectric plate (1), a first adhesive plate (5), a second dielectric plate (2), a second adhesive plate (6), a third dielectric plate (3), a third adhesive plate (7) and a fourth dielectric plate (4) which are stacked in sequence; Metal grounding structures (36) are printed on both sides of the first dielectric plate (1), on one side of the second dielectric plate (2) close to the second adhesive plate (6), on one side of the third dielectric plate (3) close to the second adhesive plate (6), and on both sides of the fourth dielectric plate (4); The surface of the second dielectric plate (2) close to the first adhesive plate (5) is printed with a left-handed sum-difference network structure (37); The surface of the third dielectric plate (3) close to the third adhesive plate (7) is printed with a right-handed sum-difference network structure (38); The first dielectric plate (1), the first adhesive plate (5), the second dielectric plate (2), the second adhesive plate (6), the third dielectric plate (3), the third adhesive plate (7) and the fourth dielectric plate (4) are all provided with connecting through holes at corresponding positions, and the connecting through holes are connected in sequence; A feeding hole (21) is provided in the left-handed sum-and-difference network structure (37) on the second dielectric plate (2), and mutually interpenetrating feeding through holes are provided at positions corresponding to the feeding hole (21) on the second adhesive plate (6), the third dielectric plate (3), the third adhesive plate (7) and the fourth dielectric plate (4).

2. A dual circular polarization sum-difference network as claimed in claim 1, characterized in that: The left-handed sum-difference network structure (37) comprises a first left-handed sub-network structure (8), a second left-handed sub-network structure (39), a third left-handed sub-network structure (40), a fourth left-handed sub-network structure (41), a first bridge (9), a second bridge (10), a third bridge (11) and a fourth bridge (12); The input ends of the first left-handed subnetwork structure (8) and the fourth left-handed subnetwork structure (41) are respectively connected to the two output ends of the first bridge (9), and the input ends of the second left-handed subnetwork structure (39) and the third left-handed subnetwork structure (40) are respectively connected to the two output ends of the second bridge (10); One input end of the first bridge (9) is connected to the output end of the third bridge (11) corresponding to the azimuth difference input, and the other input end is connected to the output end of the fourth bridge (12) corresponding to the elevation difference input via a sixth 90° phase shifter (35); One input end of the second bridge (10) is connected to the output end of the third bridge (11) corresponding to the port input through a seventh 90° phase shifter (30), and the other input end is connected to the output end of the fourth bridge (12) corresponding to the load input; Feeding holes (21) are provided in the four network structures.

3. A dual circular polarization sum-difference network as claimed in claim 2, characterized in that: The first left-handed sub-network structure (8), the second left-handed sub-network structure (39), the third left-handed sub-network structure (40) and the fourth left-handed sub-network structure (41) all include a fifth bridge (13), a sixth bridge (14), a seventh bridge (15), an eighth bridge (16), a first Wilkinson power divider (17), a second Wilkinson power divider (18) and a third Wilkinson power divider (19), wherein the first left-handed sub-network structure (8) and the second left-handed sub-network structure (39) also include a first 90° phase shifter (20); one end of the first 90° phase shifter (20) is the input end of the first left-handed sub-network structure (8) or the second left-handed sub-network structure (39), and the other end is connected to the input end of the second Wilkinson power divider (18); The two output ends of the second Wilkinson power divider (18) are respectively connected to the input end of the first Wilkinson power divider (17) and the input end of the third Wilkinson power divider (19); The two output ends of the first Wilkinson power divider (17) are respectively connected to an input end of the fifth bridge (13) and an input end of the seventh bridge (15); the two output ends of the third Wilkinson power divider (19) are respectively connected to an input end of the sixth bridge (14) and an input end of the eighth bridge (16); The feeding holes (21) are respectively arranged at two output ends of the fifth bridge (13), two output ends of the sixth bridge (14), two output ends of the seventh bridge (15) and two output ends of the eighth bridge (16).

4. A dual circular polarization sum-difference network as claimed in claim 3, characterized in that: The connecting through holes are respectively arranged at the other input ends of the fifth bridge (13), the sixth bridge (14), the seventh bridge (15), and the eighth bridge (16); A plurality of metallized through holes are also arranged outside each connecting through hole along the circumferential direction, and the metallized through holes penetrate the first dielectric plate (1), the first adhesive plate (5), the second dielectric plate (2), the second adhesive plate (6), the third dielectric plate (3), the third adhesive plate (7) and the fourth dielectric plate (4), forming a coaxial structure with the connecting through hole.

5. A dual circular polarization sum-difference network as claimed in any one of claims 1 to 4, characterized in that: The right-handed sum-difference network structure (38) includes a first right-handed sub-network structure (34), a second right-handed sub-network structure (42), a third right-handed sub-network structure (43), a fourth right-handed sub-network structure (44), a ninth bridge (22), a tenth bridge (23), an eleventh bridge (24) and a twelfth bridge (25); The input ends of the third right-handed sub-network structure (43) and the fourth right-handed sub-network structure (44) are respectively connected to an output end of the ninth bridge (22) and an output end of the tenth bridge (23); The input end of the second right-handed sub-network structure (42) is connected to the other output end of the ninth bridge (22) through the second 90° phase shifter (28), and the input end of the first right-handed sub-network structure (34) is connected to the other output end of the tenth bridge (23) through the third 90° phase shifter (29); One input end of the ninth bridge (22) is connected to the output end of the eleventh bridge (24) corresponding to the port input, and the other input end is connected to the output end of the twelfth bridge (25) corresponding to the load input through a fourth 90° phase shifter (26); One input end of the tenth bridge (23) is connected to the output end of the eleventh bridge (24) corresponding to the azimuth difference input through a fifth 90° phase shifter (27), and the other input end is connected to the output end of the twelfth bridge (25) corresponding to the elevation difference input.

6. A dual circular polarization sum-difference network as claimed in claim 5, characterized in that: The first right-handed sub-network structure (34), the second right-handed sub-network structure (42), the third right-handed sub-network structure (43), and the fourth right-handed sub-network structure (44) all include a fourth Wilkinson power divider (31), a fifth Wilkinson power divider (32), and a sixth Wilkinson power divider (33); The input end of the fifth Wilkinson power divider (32) in the second right-handed sub-network structure (42) is connected to the second 90° phase shifter (28), the input end of the fifth Wilkinson power divider (32) in the first right-handed sub-network structure (34) is connected to the third 90° phase shifter (29), the input end of the fifth Wilkinson power divider (32) in the third right-handed sub-network structure (43) is connected to an output end of the ninth bridge (22), and the input end of the fifth Wilkinson power divider (32) in the fourth right-handed sub-network structure (44) is connected to an output end of the tenth bridge (23); The two output ends of the fifth Wilkinson power divider (32) are respectively connected to the input ends of the fourth Wilkinson power divider (31) and the sixth Wilkinson power divider (33); The two output ends of the fourth Wilkinson power divider (31) and the sixth Wilkinson power divider (33) are respectively electrically connected to corresponding feeding through holes on the third dielectric plate (3).

7. A dual circular polarization sum-difference network as claimed in claim 6, characterized in that: The isolation resistors of the first Wilkinson power divider (17), the second Wilkinson power divider (18), the third Wilkinson power divider (19), the fourth Wilkinson power divider (31), the fifth Wilkinson power divider (32) and the sixth Wilkinson power divider (33) all adopt a 0402 package size.

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