Filtering type broadband beam forming network with non-reflection input and reconfigurable output phase difference

Abstract

The invention discloses a filtering type broadband beam forming network with non-reflection input and reconfigurable output phase difference. The filtering type broadband beam forming network comprises broadband non-reflection filtering power dividers, phase inverters, multi-resonance absorption branches, multi-path multi-phase filtering phase shifters and ports. The broadband non-reflection filtering power divider comprises a five-line coupling structure, an isolation resistor, a first absorption branch knot and a second absorption branch knot. The isolation resistor comprises a first resistor, a second resistor and a third resistor; the first absorption branch knot comprises a first absorption resistor and a first short-circuit line; the second absorption branch knot comprises a second absorption resistor and a second short-circuit line. According to the device, the broadband non-reflection filtering power divider is arranged, and the multi-resonance absorption branch knots are combined, so that broadband filtering response, full-band input non-reflection characteristics and flat output amplitude and phase are obtained; six groups of output phase differences can be obtained by arranging the multi-path multi-phase filtering phase shifters and combining the phase inverters; and the stop-band suppression characteristic of the beam forming network is further optimized by adopting a multi-path multi-phase filtering phase shifter.

Description

Technical Field

[0001] This invention relates to the field of microwave antennas, and more specifically to a filter-type broadband beamforming network with input non-reflection and reconfigurable output phase difference. Background Technology

[0002] Multi-beam antennas can achieve high-precision beamforming, thereby effectively improving spectrum utilization and coverage, and are therefore widely used in wireless communication and radar systems. The beamforming network is the core component of a multi-beam antenna; it excites the antenna array to generate radiating beams with different directions in space by outputting signals with a certain amplitude and phase distribution.

[0003] Among them, beamforming networks with broadband response can provide output signals with specific amplitude and phase distributions over a wide frequency band, offering the advantage of high reliability. In addition to broadband characteristics, beamforming networks with integrated filtering functions or reflection-free characteristics can effectively suppress out-of-band interference signals, thereby improving communication stability. Furthermore, common beamforming networks can only obtain a few fixed output phase differences using input signals from different ports, resulting in limited design flexibility. Therefore, researching filtered beamforming networks with broadband response, reflection-free filtering, and reconfigurable output phase difference characteristics has significant application value. Summary of the Invention

[0004] Based on the technical problems disclosed in the prior art, the present invention discloses a filter-type broadband beamforming network with input non-reflection and reconfigurable output phase difference, comprising: a broadband non-reflection filter power divider, an inverter, a multi-resonant absorption stub, a multi-channel multi-phase filter phase shifter, and ports; The broadband non-reflective filter power divider includes a five-wire coupling structure, an isolation resistor, a first absorption stub, and a second absorption stub; the isolation resistor includes a first resistor, a second resistor, and a third resistor; the first absorption stub includes a first absorption resistor and a first shorting circuit; the second absorption stub includes a second absorption resistor and a second shorting circuit. The inverter includes a first inverter, a second inverter, and a third inverter; the first inverter includes a first hammer-shaped wire, a first C-shaped wire, a first dumbbell-shaped floor groove, a first switch, and a second switch; the structure and parameters of the second and third inverters are the same as those of the first inverter; The multi-resonant absorption stub includes a first multi-resonant absorption stub, a second multi-resonant absorption stub, and a third multi-resonant absorption stub; the first multi-resonant absorption stub includes a first transmission line, a third absorption resistor, a third short circuit, a first open circuit, and a second open circuit; the structure and parameters of the second and third multi-resonant absorption stubs are the same as those of the first multi-resonant absorption stub. The multi-channel multiphase filter phase shifter includes a reference line, a first main line, a second main line, a third main line, a fourth main line, and a fifth main line; the reference line includes a first coupling three-line, a second coupling three-line, and a first coupling two-line; the first main line includes a third coupling three-line, a fourth coupling three-line, a second coupling two-line, a first delay line, a second delay line, a seventh switch, and an eighth switch; the second main line (43), the third main line, the fourth main line, and the fifth main line have the same structure as the first main line, but different parameters; The port includes an input port, a first output port, a second output port, and a third output port; The first resistor is connected between the left ends of the first and third lines of the five-wire coupling structure; the second resistor is connected between the left ends of the third and fifth lines of the five-wire coupling structure; the third resistor is connected between the right ends of the second and fourth lines of the five-wire coupling structure; one end of the first absorption resistor is connected to the first shorting line, and the other end is connected to the right end of the second line of the five-wire coupling structure; one end of the second absorption resistor is connected to the second shorting line, and the other end is connected to the right end of the fourth line of the five-wire coupling structure. The first hammer-shaped line and the first C-shaped line of the first inverter are located on the upper layer of the dielectric substrate, and the first dumbbell-shaped ground groove is located on the lower layer of the dielectric substrate; the first switch and the second switch are alternately switched on and off to realize in-phase and inverted outputs, respectively; the switching control methods of the second inverter and the third inverter are the same as those of the first inverter; The first multi-resonant absorption stub, the second multi-resonant absorption stub, and the third multi-resonant absorption stub are connected in parallel to the output ports of the first inverter, the second inverter, and the third inverter, respectively; one end of the third absorption resistor is connected to the lower end of the first transmission line and the left end of the first open line, and the other end is connected to the upper end of the third short line and the left end of the second open line. The left end of the reference line is connected to the output terminal of the first inverter, and the right end is connected to the first output port; the first coupling twin line is connected in series between the first coupling three line and the second coupling three line. The left ends of the first, second, and third main lines are connected to the output of the second inverter via the seventh, ninth, and eleventh switches, respectively, and the right ends are connected to the second output port via the eighth, tenth, and twelfth switches, respectively. The second coupling double line is connected in series between the third and fourth coupling triple lines. The left end of the first delay line is connected to the seventh switch, and the right end is connected to the left end of the third coupling triple line. The right end of the second delay line is connected to the eighth switch, and the left end is connected to the right end of the fourth coupling triple line. By controlling the on / off states of the seventh, eighth, ninth, tenth, eleventh, and twelfth switches, different phase outputs are achieved at the second output port. The left ends of the fourth and fifth main lines are connected to the output terminals of the third inverter via the thirteenth and fifteenth switches, respectively, and the right ends are connected to the third output port via the fourteenth and sixteenth switches, respectively. By controlling the on / off states of the thirteenth, fourteenth, fifteenth, and sixteenth switches, different phase outputs can be achieved at the third output port.

[0005] Furthermore, the relative phase differences of the first principal line, the second principal line, the third principal line, the fourth principal line, and the fifth principal line with respect to the reference line are all different, and their range can cover -180° to 0°.

[0006] Furthermore, when the seventh and eighth switches, the thirteenth and fourteenth switches of the switch combination are closed, and the ninth and tenth switches, the eleventh and twelfth switches, and the fifteenth and sixteenth switches are open, the reference line, the first main line, and the fourth main line in the multi-channel multiphase filter phase shifter are activated to obtain the first type of output phase difference of the beamforming network. Based on this, by controlling the first and second switches, the third and fourth switches, and the fifth and sixth switches to switch from the on / off, on / off, on / off state to the off / on, on / off, off / on state, the second type of output phase difference of the beamforming network is obtained.

[0007] Furthermore, when the ninth and tenth switches, the fifteenth and sixteenth switches are closed, and the seventh and eighth switches, the eleventh and twelfth switches, and the thirteenth and fourteenth switches are open, the reference line, the second main line, and the fifth main line in the multi-channel multiphase filter phase shifter are activated, obtaining the third type of output phase difference of the beamforming network. Based on this, by controlling the switch combination of the first and second switches, the third and fourth switches, and the fifth and sixth switches to switch from the on / off, on / off, on / off state to the off / on, on / off, off / on state, the fourth type of output phase difference of the beamforming network is obtained.

[0008] Furthermore, when the eleventh and twelfth switches, the thirteenth and fourteenth switches are closed, and the seventh and eighth switches, the ninth and tenth switches, and the fifteenth and sixteenth switches are open, the reference line, the third main line, and the fourth main line in the multi-channel multiphase filter phase shifter are activated, obtaining the fifth type of output phase difference of the beamforming network. Based on this, by controlling the switch combination of the first and second switches, the third and fourth switches, and the fifth and sixth switches to switch from the on / off, off / on, off / on state to the off / on, off / on, on / off state, the sixth type of output phase difference of the beamforming network is obtained.

[0009] Furthermore, by adjusting the impedance ratio of the first transmission line and the third short path in the first multi-resonant absorbing stub, the operating bandwidth is broadened; by adjusting the impedance values ​​of the first open path and the second open path, the position of the transmission zero point is changed; the performance impact of the second and third multi-resonant absorbing stubs is the same as that of the first multi-resonant absorbing stub.

[0010] Furthermore, by adjusting the linewidth of each coupling three-line and coupling two-line in the multi-channel multi-phase filter phase shifter, the position of the transmission zero point of the multi-channel multi-phase filter phase shifter can be changed; by adjusting the gap width of the coupling three-line and coupling two-line from the first main line to the fifth main line, a flat output phase difference of the multi-channel multi-phase filter phase shifter in the broadband range can be obtained.

[0011] Due to the adoption of the above technical solutions, the filter-type broadband beamforming network with reconfigurable input non-reflection and output phase difference proposed in this invention has the following advantages: (1) By setting up a broadband non-reflection filter power divider and combining it with a multi-resonant absorption stub, a broadband filter response, full-band input non-reflection characteristics, and flat output amplitude and phase are obtained; (2) By setting up a multi-channel multi-phase filter phase shifter and combining it with an inverter, a total of six sets of output phase differences can be obtained; (3) By adopting a multi-channel multi-phase filter phase shifter, the stopband suppression characteristics of the beamforming network are further optimized. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the structure of the filter-type broadband beamforming network with input non-reflection and reconfigurable output phase difference described in this invention; Figure 2 This is a graph showing the S-parameter results of the filter-type broadband beamforming network with input non-reflection and output phase reconfigurability described in this invention in State 1 and State 2. Figure 3 This is a graph showing the S-parameter results of the filter-type broadband beamforming network with input non-reflection and output phase reconfigurability described in this invention in State 3 and State 4. Figure 4 This is a graph showing the S-parameter results of the filter-type broadband beamforming network with input non-reflection and output phase difference reconfigurable as described in this invention in State 5 and State 6. Figure 5This is a diagram showing the phase difference between the output ports of the filter-type broadband beamforming network described in this invention, which has no input reflection and reconfigurable output phase difference, in State 1 and State 2. Figure 6 This is a diagram showing the phase difference between the output ports of the filter-type broadband beamforming network described in this invention, which has no input reflection and reconfigurable output phase difference, in State 3 and State 4. Figure 7 This is a diagram showing the phase difference between the output ports of the filter-type broadband beamforming network described in this invention, which has no input reflection and reconfigurable output phase difference, in State 5 and State 6.

[0014] In the picture: 1. Broadband non-reflective filter power divider; 11. Five-wire coupling structure; 12. Isolation resistor; 13. First absorption stub; 14. Second absorption stub; 121. Including the first resistor; 122. Second resistor; 123. Third resistor; 131. First absorption resistor; 132. First short circuit; 141. Second absorption resistor; 142. Second short circuit. 2. Inverter; 21. First inverter; 22. Second inverter; 23. Third inverter; 211. First hammer wire; 212. First C-wire; 213. First dumbbell-shaped floor groove; 214. First switch; 215. Second switch; 221. Second hammer wire; 222. Second C-wire; 223. Second dumbbell-shaped floor groove; 224. Third switch; 225. Fourth switch; 231. Third hammer wire; 232. Third C-wire; 233. Third dumbbell-shaped floor groove; 234. Fifth switch; 235. Sixth switch; 3. Multiresonant absorption stub, 31. First multiresonant absorption stub, 32. Second multiresonant absorption stub, 33. Third multiresonant absorption stub, 311. First transmission line, 312. Third absorption resistor, 313. Third short circuit, 314. First open circuit, 315. Second open circuit, 321. Second transmission line, 322. Fourth absorption resistor, 323. Fourth short circuit, 324. Third open circuit, 325. Fourth open circuit, 331. Third transmission line, 332. Fifth absorption resistor, 333. Fifth short circuit, 334. Fifth open circuit, 335. Sixth open circuit; 4. Multi-channel multi-phase filter phase shifter, 41. Reference line, 42. First main line, 43. Second main line, 44. Third main line, 45. Fourth main line, 46. Fifth main line, 411. First coupling three-line, 412. Second coupling three-line, 413. First coupling two-line, 421. Third coupling three-line, 422. Fourth coupling three-line, 423. Second coupling two-line, 424. First delay line, 425. Second delay line, 426. Seventh switch, 427. Eighth switch, 431. Fifth coupling three-line, 432. Sixth coupling three-line, 433. Three-coupled double line, 434, third delay line, 435, fourth delay line, 436, ninth switch, 437, tenth switch, 441, seventh-coupled triple line, 442, eighth-coupled triple line, 443, fourth-coupled double line, 444, fifth delay line, 445, sixth delay line, 446, eleventh switch, 447, twelfth switch, 451, ninth-coupled triple line, 452, tenth-coupled triple line, 453, fifth-coupled double line, 454, seventh delay line, 455, eighth delay line, 456, thirteenth switch, 457, fourteenth switch; 461. Eleventh Coupled Three-Line, 462. Twelfth Coupled Three-Line, 463. Sixth Coupled Two-Line, 464. Ninth Delay Line, 465. Tenth Delay Line, 466. Fifteenth Switch, 467. Sixteenth Switch; 5. Port, 51. Input port, 52. First output port, 53. Second output port, 54. Third output port; Detailed Implementation To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. 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 should fall within the scope of protection of the present invention.

[0015] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0016] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0017] The technical specifications used in this embodiment are as follows: Frequency range: 0 GHz ~ 5 GHz; Return loss: >10dB (across the entire frequency band); Filter bandwidth: >70%; Out-of-band suppression: >20dB; Output port amplitude: -4.77±0.5dB (excluding insertion loss of the switch); The phase difference between the output ports of the beamforming network in State 1 and State 2 is -30°±5° and 150°±5°, respectively. Phase difference between the output ports of the beamforming network in State 3 and State 4: -90°±5° and 90°±5°; The phase difference between the output ports of the beamforming network in State 5 and State 6 is 60°±5° and -120°±5°, respectively. like Figure 1 The illustrated filter-type broadband beamforming network with input non-reflection and reconfigurable output phase difference includes: a broadband non-reflection filter power divider 1, an inverter 2, a multi-resonant absorption stub 3, a multi-channel multi-phase filter phase shifter 4, and a port 5.

[0018] The broadband non-reflective filter power divider 1 includes a five-wire coupling structure 11, an isolation resistor 12, a first absorption stub 13, and a second absorption stub 14; the isolation resistor 12 includes a first resistor 121, a second resistor 122, and a third resistor 123; the first absorption stub 13 includes a first absorption resistor 131 and a first shorting circuit 132; the second absorption stub 14 includes a second absorption resistor 141 and a second shorting circuit 142.

[0019] The inverter 2 includes a first inverter 21, a second inverter 22, and a third inverter 23; the first inverter 21 includes a first hammer-shaped wire 211, a first C-shaped wire 212, a first dumbbell-shaped floor groove 213, a first switch 214, and a second switch 215; the structure and parameters of the second inverter 22 and the third inverter 23 are the same as those of the first inverter 21.

[0020] The multi-resonant absorption stub 3 includes a first multi-resonant absorption stub 31, a second multi-resonant absorption stub 32, and a third multi-resonant absorption stub 33; the first multi-resonant absorption stub 31 includes a first transmission line 311, a third absorption resistor 312, a third short circuit 313, a first open circuit 314, and a second open circuit 315; the structure and parameters of the second multi-resonant absorption stub 32 and the third multi-resonant absorption stub 33 are the same as those of the first multi-resonant absorption stub 31.

[0021] The multi-channel multiphase filter phase shifter 4 includes a reference line 41, a first main line 42, a second main line 43, a third main line 44, a fourth main line 45, and a fifth main line 46. The reference line 41 includes a first three-coupled line 411, a second three-coupled line 412, and a first two-coupled line 413. The first main line 42 includes a third three-coupled line 4221, a fourth three-coupled line 422, a second two-coupled line 423, a first delay line 424, a second delay line 425, a seventh switch 426, and an eighth switch 427. The second main line 43, the third main line 44, the fourth main line 45, and the fifth main line 46 have the same structure as the first main line 42, but different parameters.

[0022] The port 5 includes an input port 51, a first output port 52, a second output port 53, and a third output port 54.

[0023] The first resistor 121 is connected between the left ends of the first and third lines of the five-wire coupling structure 11; the second resistor 122 is connected between the left ends of the third and fifth lines of the five-wire coupling structure 11; and the third resistor 123 is connected between the right ends of the second and fourth lines of the five-wire coupling structure 11. One end of the first absorption resistor 131 is connected to the first shorting line 132, and the other end is connected to the right end of the second line of the five-wire coupling structure 11. One end of the second absorption resistor 141 is connected to the second shorting line 142, and the other end is connected to the right end of the fourth line of the five-wire coupling structure 11.

[0024] The first hammer-shaped line 211 and the first C-shaped line 212 of the first inverter 21 are located on the upper layer of the dielectric substrate, and the first dumbbell-shaped floor groove 213 is located on the lower layer of the dielectric substrate; the first switch 214 and the second switch 215 are alternately switched on and off to achieve in-phase and inverted outputs respectively; the switching control methods of the second inverter 22 and the third inverter 23 are the same as those of the first inverter 21.

[0025] The first multi-resonant absorption stub 31, the second multi-resonant absorption stub 32, and the third multi-resonant absorption stub 33 are connected in parallel to the output ports of the first inverter 21, the second inverter 22, and the third inverter 23, respectively; one end of the third absorption resistor 312 is connected to the lower end of the first transmission line 311 and the left end of the first open line 314, and the other end is connected to the upper end of the third short line 313 and the left end of the second open line 315.

[0026] The left end of the reference line 41 is connected to the output of the first inverter 21, and the right end is connected to the first output port 52; the first coupling double line 413 is connected in series between the first coupling triple line 411 and the second coupling triple line 412.

[0027] The left ends of the first main line 42, the second main line 43, and the third main line 44 are connected to the output terminal of the second inverter 22 via the seventh switch 426, the ninth switch 436, and the eleventh switch 446, respectively, and the right ends are connected to the second output port 53 via the eighth switch 427, the tenth switch 437, and the twelfth switch 447, respectively. The second coupling double line 423 is connected in series between the third coupling triple line 421 and the fourth coupling triple line 422. The left end of the first delay line 424 is connected to the seventh switch 426, and the right end is connected to the left end of the third coupling triple line 421. The right end of the second delay line 425 is connected to the eighth switch 427, and the left end is connected to the right end of the fourth coupling triple line 422. By controlling the on / off state of the switch combinations 426 and 427, 436 and 437, and 446 and 447, different phase outputs can be achieved at the second output port 53.

[0028] The left ends of the fourth main line 45 and the fifth main line 46 are connected to the output terminal of the third inverter 23 through the thirteenth switch 456 and the fifteenth switch 466, respectively, and the right ends are connected to the third output port 54 through the fourteenth switch 457 and the sixteenth switch 467, respectively. By controlling the on and off of the switch combinations 456 and 457, 466 and 467, different phase outputs can be achieved at the third output port 54.

[0029] The relative phase differences of the first principal line 42, the second principal line 43, the third principal line 44, the fourth principal line 45 and the fifth principal line 46 with respect to the reference line 41 are -30°, -90°, -120°, -60° and -180°, respectively.

[0030] When the switch combinations 7 (switches 426 and 427), 13 (switches 456 and 14 (switches 457)) and 9 (switches 436 and 10 (switches 437), 11 (switches 446 and 12 (switches 447), 15 (switches 466 and 16 (switches 467)) are closed, the reference line 41, the first main line 42, and the fourth main line 45 in the multi-channel multiphase filter phase shifter 4 are operational. By controlling the switch combinations 1 (switches 214 and 215), 3 (switches 224 and 425), 5 (switches 234 and 6 (switches 235) to switch from an on / off, on / off, on / off state to an off / on, on / off, off / on state, the output phase difference of the beamforming network changes from -30° to 150°. These two operating modes are named State1 and State2, respectively.

[0031] When the ninth switch 436, tenth switch 437, fifteenth switch 466, and sixteenth switch 467 are closed, and the seventh switch 426, eighth switch 427, eleventh switch 446, twelfth switch 447, thirteenth switch 456, and fourteenth switch 457 are open, the reference line 41, the second main line 43, and the fifth main line 46 in the multi-channel multi-phase filter phase shifter 4 are operational. By controlling the switch combinations first switch 214 and second switch 215, third switch 224 and fourth switch 225, fifth switch 234, and sixth switch 235 to switch from an on / off, on / off, on / off state to an off / on, on / off, off / on state, the output phase difference of the beamforming network changes from -90° to 90°. These two operating modes are named State3 and State4, respectively.

[0032] When the eleventh switch 446 and the twelfth switch 447, the thirteenth switch 456 and the fourteenth switch 457 are closed, and the seventh switch 426 and the eighth switch 427, the ninth switch 436 and the tenth switch 437, the fifteenth switch 466 and the sixteenth switch 467 are open, the reference line 41, the third main line 44 and the fourth main line 45 in the multi-channel multi-phase filter phase shifter 4 are activated. After the control switch combination of the first switch 214 and the second switch 215, the third switch 224 and the fourth switch 225, the fifth switch 234 and the sixth switch 235 are switched from the on / off, off / on, off / on state to the off / on, off / on, on / off state, the output phase difference of the beamforming network changes from 60° to -120°. These two working modes are named State5 and State6, respectively. By adjusting the impedance ratio of the first transmission line 311 and the third shorting line 313 in the first multi-resonant absorption stub 31, the operating bandwidth can be broadened; by adjusting the impedance values ​​of the first open line 314 and the second open line 315, the position of the transmission zero point can be changed; the second multi-resonant absorption stub 32 and the third multi-resonant absorption stub 33 have the same performance impact as the first multi-resonant absorption stub 31.

[0033] By adjusting the line width of each coupling three-wire and coupling two-wire in the multi-channel multi-phase filter phase shifter 4, the position of the transmission zero point of the multi-channel multi-phase filter phase shifter 4 can be changed; by adjusting the gap width of the coupling three-wire and coupling two-wire in the first main line to the fifth main line 42-46, a flat output phase difference of the multi-channel multi-phase filter phase shifter 4 in the broadband range can be obtained.

[0034] Table 1 shows the phase difference between output ports generated by different reference line main line combinations when each switch combination switches to different states.

[0035] Table 1

[0036] Figure 2 , Figure 3 , Figure 4 The S-parameter results of the proposed filter-type broadband beamforming network with input-free reflection and reconfigurable output phase difference are presented in State 1 and State 2, State 3 and State 4, and State 5 and State 6. |S11| is less than -10dB across the entire frequency band, demonstrating input-free reflection characteristics. The 3-dB filtering bandwidths are 81.5% (1.13 ~ 2.76 GHz), 77% (1.18 ~ 2.72 GHz), and 82% (1.12 ~ 2.76 GHz), respectively, with out-of-band rejection greater than 20dB. The S-parameter results meet the technical requirements of broadband filter beamforming networks, indicating that the beamforming network proposed in this invention exhibits good impedance matching and input-free reflection characteristics over a wide frequency range.

[0037] Figure 5 , Figure 6 , Figure 7 The results of the phase difference between the output ports of the proposed filter-type broadband beamforming network with input non-reflection and reconfigurable output phase difference are shown in State 1 and State 2, State 3 and State 4, and State 5 and State 6. Six output phase differences (-30° and 150°, -90° and 90°, 60° and -120°) can be achieved within a relative bandwidth greater than 40% (1.6 ~ 2.4 GHz), and the phase error is less than ±5° for all of them. This demonstrates that the beamforming network proposed in this invention exhibits high flatness in its output phase difference.

[0038] This invention has the advantages of no input reflection, wide passband bandwidth, good out-of-band suppression performance, flat amplitude and phase difference between output ports, reconfigurable output phase difference, as well as simple design, high flexibility and low cost.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A filter-type broadband beamforming network with no input reflection and reconfigurable output phase difference, characterized in that... include: Broadband non-reflective filter power divider (1), inverter (2), multi-resonant absorption stub (3), multi-channel multi-phase filter phase shifter (4) and port (5); The broadband non-reflective filter power divider (1) includes a five-wire coupling structure (11), an isolation resistor (12), a first absorption stub (13), and a second absorption stub (14); the isolation resistor (12) includes a first resistor (121), a second resistor (122), and a third resistor (123); the first absorption stub (13) includes a first absorption resistor (131) and a first shorting circuit (132); the second absorption stub (14) includes a second absorption resistor (141) and a second shorting circuit (142). The inverter (2) includes a first inverter (21), a second inverter (22), and a third inverter (23); the first inverter (21) includes a first hammer-shaped wire (211), a first C-shaped wire (212), a first dumbbell-shaped floor groove (213), a first switch (214), and a second switch (215); the structure and parameters of the second inverter (22) and the third inverter (23) are the same as those of the first inverter (21); The multi-resonant absorption stub (3) includes a first multi-resonant absorption stub (31), a second multi-resonant absorption stub (32), and a third multi-resonant absorption stub (33); the first multi-resonant absorption stub (31) includes a first transmission line (311), a third absorption resistor (312), a third short circuit (313), a first open circuit (314), and a second open circuit (315); the structure and parameters of the second multi-resonant absorption stub (32) and the third multi-resonant absorption stub (33) are the same as those of the first multi-resonant absorption stub (31); The multi-channel multiphase filter phase shifter (4) includes a reference line (41), a first main line (42), a second main line (43), a third main line (44), a fourth main line (45), and a fifth main line (46); the reference line (41) includes a first coupling three-line (411), a second coupling three-line (412), and a first coupling two-line (413); the first main line (42) includes a third coupling three-line (421), a fourth coupling three-line (422), a second coupling two-line (423), a first delay line (424), a second delay line (425), a seventh switch (426), and an eighth switch (427); the second main line (43), the third main line (44), the fourth main line (45), and the fifth main line (46) have the same structure as the first main line (42), but different parameters; The port (5) includes an input port (51), a first output port (52), a second output port (53), and a third output port (54); The first resistor (121) is connected between the left ends of the first and third lines of the five-wire coupling structure (11), the second resistor (122) is connected between the left ends of the third and fifth lines of the five-wire coupling structure (11), and the third resistor (123) is connected between the right ends of the second and fourth lines of the five-wire coupling structure (11); one end of the first absorption resistor (131) is connected to the first shorting line (132), and the other end is connected to the right end of the second line of the five-wire coupling structure (11); one end of the second absorption resistor (141) is connected to the second shorting line (142), and the other end is connected to the right end of the fourth line of the five-wire coupling structure (11); The first hammer-shaped line (211) and the first C-shaped line (212) of the first inverter (21) are located on the upper layer of the dielectric substrate, and the first dumbbell-shaped floor groove (213) is located on the lower layer of the dielectric substrate; the first switch (214) and the second switch (215) are switched on and off alternately to achieve in-phase and inverted outputs respectively; the switching control methods of the second inverter (22) and the third inverter (23) are the same as those of the first inverter (21); The first multi-resonant absorption stub (31), the second multi-resonant absorption stub (32), and the third multi-resonant absorption stub (33) are connected in parallel to the output ports of the first inverter (21), the second inverter (22), and the third inverter (23), respectively; one end of the third absorption resistor (312) is connected to the lower end of the first transmission line (311) and the left end of the first open line (314), and the other end is connected to the upper end of the third short line (313) and the left end of the second open line (315); The left end of the reference line (41) is connected to the output of the first inverter (21), and the right end is connected to the first output port (52); the first coupling double line (413) is connected in series between the first coupling triple line (411) and the second coupling triple line (412); The left ends of the first main line (42), the second main line (43), and the third main line (44) are connected to the output of the second inverter (22) via the seventh switch (426), the ninth switch (436), and the eleventh switch (446), respectively, and the right ends are connected to the second output port (53) via the eighth switch (427), the tenth switch (437), and the twelfth switch (447), respectively; the second coupling double line (423) is connected in series between the third coupling triple line (421) and the fourth coupling triple line (422); the first delay line ( The left end of the second delay line (424) is connected to the seventh switch (426), and the right end is connected to the left end of the third coupling line (421); the right end of the second delay line (425) is connected to the eighth switch (427), and the left end is connected to the right end of the fourth coupling line (422); by controlling the on and off of the seventh switch (426), the eighth switch (427), the ninth switch (436), the tenth switch (437), the eleventh switch (446), and the twelfth switch (447), different phase outputs are achieved at the second output port (53); The left ends of the fourth main line (45) and the fifth main line (46) are connected to the output of the third inverter (23) through the thirteenth switch (456) and the fifteenth switch (466) respectively, and the right ends are connected to the third output port (54) through the fourteenth switch (457) and the sixteenth switch (467) respectively. By controlling the on and off of the thirteenth switch (456), the fourteenth switch (457), the fifteenth switch (466) and the sixteenth switch (467), different phase outputs are achieved at the third output port (54).

2. The filter-type broadband beamforming network with input non-reflection and output phase difference reconfigurability according to claim 1, characterized in that: The relative phase difference between the first principal line (42), the second principal line (43), the third principal line (44), the fourth principal line (45) and the fifth principal line (46) with respect to the reference line (41) is different and can cover the range of -180° to 0°.

3. The filter-type broadband beamforming network with input non-reflection and output phase difference reconfigurability according to claim 1, characterized in that: When the seventh switch (426) and the eighth switch (427), the thirteenth switch (456) and the fourteenth switch (457) of the switch combination are closed, and the ninth switch (436) and the tenth switch (437), the eleventh switch (446) and the twelfth switch (447), the fifteenth switch (466) and the sixteenth switch (467) are open, the reference line (41), the first main line (42) and the fourth main line (45) in the multi-channel multi-phase filter phase shifter (4) are working to obtain the first type of output phase difference of the beamforming network; on this basis, by controlling the first switch (214) and the second switch (215), the third switch (224) and the fourth switch (225), the fifth switch (234) and the sixth switch (235) to switch from the on / off, on / off, on / off state to the off / on, on / off, off / on state, the second type of output phase difference of the beamforming network is obtained.

4. The filter-type broadband beamforming network with input non-reflection and output phase difference reconfigurability according to claim 1, characterized in that: When the ninth switch (436) and the tenth switch (437), the fifteenth switch (466) and the sixteenth switch (467) are closed, and the seventh switch (426) and the eighth switch (427), the eleventh switch (446) and the twelfth switch (447), the thirteenth switch (456) and the fourteenth switch (457) are open, the reference line (41), the second main line (43) and the fifth main line (46) in the multi-channel multi-phase filter phase shifter (4) are working to obtain the third type of output phase difference of the beamforming network; on this basis, by controlling the switch combination of the first switch (214) and the second switch (215), the third switch (224) and the fourth switch (225), the fifth switch (234) and the sixth switch (235) to switch from the on / off, on / off, on / off state to the off / on, on / off, off / on state, the fourth type of output phase difference of the beamforming network is obtained.

5. The filter-type broadband beamforming network with input non-reflection and output phase difference reconfigurability according to claim 1, characterized in that: When the eleventh switch (446) and the twelfth switch (447), the thirteenth switch (456) and the fourteenth switch (457) are closed, and the seventh switch (426) and the eighth switch (427), the ninth switch (436) and the tenth switch (437), the fifteenth switch (466) and the sixteenth switch (467) are open, the reference line (41), the third main line (44) and the fourth main line (45) in the multi-channel multi-phase filter phase shifter (4) are working to obtain the fifth type of output phase difference of the beamforming network; on this basis, by controlling the switch combination of the first switch (214) and the second switch (215), the third switch (224) and the fourth switch (225), the fifth switch (234) and the sixth switch (235) to switch from the on / off, off / on, off / on state to the off / on, off / on, on / off state, the sixth type of output phase difference of the beamforming network is obtained.

6. The filter-type broadband beamforming network with input non-reflection and output phase difference reconfigurability according to claim 1, characterized in that: By adjusting the impedance ratio of the first transmission line (311) and the third short line (313) in the first multi-resonant absorption stub (31), the working bandwidth is broadened; by adjusting the impedance values ​​of the first open line (314) and the second open line (315), the position of the transmission zero point is changed; the performance effects of the second multi-resonant absorption stub (32) and the third multi-resonant absorption stub (33) are the same as those of the first multi-resonant absorption stub (31).

7. The filter-type broadband beamforming network with input non-reflection and output phase difference reconfigurability according to claim 1, characterized in that: By adjusting the line width of each coupling three-line and coupling two-line in the multi-channel multi-phase filter phase shifter (4), the position of the transmission zero point of the multi-channel multi-phase filter phase shifter (4) can be changed; by adjusting the gap width of the coupling three-line and coupling two-line in the first main line to the fifth main line (42-46), a flat output phase difference of the multi-channel multi-phase filter phase shifter (4) in the broadband range can be obtained.

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