CN109586047B - Broadband 3X 4 Butler matrix feed network - Google Patents
Broadband 3X 4 Butler matrix feed network Download PDFInfo
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- CN109586047B CN109586047B CN201811492807.6A CN201811492807A CN109586047B CN 109586047 B CN109586047 B CN 109586047B CN 201811492807 A CN201811492807 A CN 201811492807A CN 109586047 B CN109586047 B CN 109586047B
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/0006—Particular feeding systems
- H01Q21/0075—Stripline fed arrays
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/12—Coupling devices having more than two ports
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/12—Coupling devices having more than two ports
- H01P5/16—Conjugate devices, i.e. devices having at least one port decoupled from one other port
- H01P5/18—Conjugate devices, i.e. devices having at least one port decoupled from one other port consisting of two coupled guides, e.g. directional couplers
- H01P5/184—Conjugate devices, i.e. devices having at least one port decoupled from one other port consisting of two coupled guides, e.g. directional couplers the guides being strip lines or microstrips
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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Abstract
The invention discloses a broadband 3X 4 Butler matrix feed network, which adopts 3 input ports to generate signals with equal amplitude and phase difference in the frequency range of 2GHz-4GHz, and can work in a very wide frequency range. The feed network compensates for signal differences using the coupling characteristics of the broadband bandpass filter to replace the shortcomings of the conventional transmission lines that the phases are not identical at the broadband frequency. The broadband equal power divider used in the feed network is designed on the basis of a coupler, and the power divider is easier to adjust than the traditional power divider. Compared to the conventional butler matrix which cannot provide signals with zero phase difference and thus cannot generate beams in the vertical direction, the feed network can provide signals with zero phase difference and thus can generate beams in the vertical direction.
Description
Technical Field
The invention relates to the technical field of antenna feed, in particular to a broadband 3X 4 Butler matrix feed network.
Background
Due to the rapid development of wireless communication in recent years, the popularization of 4G technology, the hot of the Internet of things and the arrival of 5G are marked by the peak period of the rapid development of wireless technology. On the other hand, with the rapid development of electronic information, the multi-beam antenna can generate different beams with the same radiation aperture and pointing to different directions due to the characteristics of multi-directional high gain, and is widely applied to wireless communication systems. The main technology for solving these problems at present is to use a beam switching smart antenna, and the butler matrix is an important part of the beam switching smart antenna, so that a beam forming network can be realized, and therefore, the beam forming network is also one of research hot spots in recent years. The bandwidth of the multi-beam antenna array is limited due to the bandwidth of the antenna array and the feed network frequency characteristics. In order to expand the operating bandwidth of the multi-beam antenna, a design of a broadband butler matrix feed network is needed.
The structure of the Butler matrix which is more commonly used and more convenient at present is to cross-cascade a 3dB coupler and a phase shifter with a specific angle between an input port and an output port, so that the performance of the Butler matrix can reach the expected index.
The prior art is investigated and known, and the specific steps are as follows:
in 2017, the Krzysztof Wincza team proposed a wideband multi-beam antenna array operating in a frequency multiplication range (1.75 GHz-3.5 GHz). Its feed network is a typical 4 x 4Butler matrix operating at low frequencies, with two outputs cascaded in the middle of the three-segment Butler matrix mentioned above. At low frequencies, the operation is a 4 x 4Butler matrix output, slowly shifting to a 2 x 2Butler matrix as the frequency gets higher. Furthermore, due to the arrangement of the antenna positions, the distance of the antenna elements is a quarter wavelength at low frequency operation, while the slow to high frequency becomes a half wavelength. Due to the good smooth characteristic of the feed network, the whole antenna array can keep the consistency of the wave beams in a frequency multiplication range. But the input ports of the Butler matrix operating at 4 x 4 and the input ports of the Butler matrix operating at 2 x 2 are equally two.
In 2018, tzyh-Guuang Ma et al developed on the basis of a 4X 4Butler matrix. He cascaded two phase shifters at each output of a 4 x 4Butler matrix, which were made up of a T-network of two varactors and a transmission line shorted at one end, equivalent to an inductor. This T-network may be equivalently a section of transmission line. By applying different voltages, the length of the equivalent transmission line can be changed by changing the capacitance value of the varactor. By this simple design method, they are increased from the original 4-port 4 beams to 4-port 16 beams. Although the design is simple, grating lobes can appear if the arrangement is not good. And the bandwidth is very narrow.
In general, there are many studies on butler matrices in existing works, but most focus on how to implement more beams in a narrow band or how to switch different networks to achieve a wide band of operating frequencies. Furthermore, beamforming in the vertical direction is difficult to achieve for all designs of butler matrices. Therefore, it is of great importance to design a novel broadband 3×4 butler matrix.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provide a broadband 3×4 butler matrix feed network which can output equal amplitude in the range of 2GHz-4GHz and the phase difference between adjacent output ports is-90 degrees, 0 degrees and +90 degrees respectively. The phase difference is controlled by the input port, and is input from different input ports, so that different phase differences can be output by the feed network, and the whole structure is symmetrical and convenient to process.
The aim of the invention can be achieved by adopting the following technical scheme:
a broadband 3×4 butler matrix feed network, the feed network includes a first dielectric plate 22, a second dielectric plate 23, and a third dielectric plate 24 that are stacked from bottom to top, a first grounding plate 20 is disposed on the lower surface of the first dielectric plate 22, a second grounding plate 21 is disposed on the upper surface of the third dielectric plate, an upper microstrip line 26 is disposed between the third dielectric plate 24 and the second dielectric plate 23, and a lower microstrip line 25 is disposed between the first dielectric plate 22 and the second dielectric plate 23;
The feed network further comprises a first broadband 3dB/90 DEG directional coupler 31, a second broadband 3dB/90 DEG directional coupler 32, a third broadband 3dB/90 DEG directional coupler 33 and a fourth broadband 3dB/90 DEG directional coupler 34 which are formed by an upper layer microstrip line 26 and a lower layer microstrip line 25, a first input port 11 of the feed network, a second input port 12 of the feed network, a third input port 13 of the feed network, a first output port 14 of the feed network, a third output port 16 of the feed network, a second output port 15 of the feed network, a fourth output port 17 of the broadband crossover network, a first broadband phase compensator 41, a second broadband phase compensator 41, a first broadband phase compensator 42, a second broadband phase compensator 42, a microstrip phase compensator 25, and the like, wherein the first broadband phase compensator is formed by the upper layer microstrip line 26 and the lower layer microstrip line 25;
the first input port 11 of the feed network is connected with the first input port 61 of the broadband equal power distributor, the first output port 62 of the broadband equal power distributor is connected with the second input port 312 of the first broadband 3dB/90 DEG directional coupler, the second output port 63 of the broadband equal power distributor is connected with the first input port 321 of the second broadband 3dB/90 DEG directional coupler, the second input port 12 of the feed network is connected with the first input port 311 of the first broadband 3dB/90 DEG directional coupler, the third input port 13 of the feed network is connected with the second input port 322 of the second broadband 3dB/90 DEG directional coupler, the first output port 313 of the first broadband 3dB/90 DEG directional coupler is connected with the input port 411 of the first broadband phase compensator, the second output port 314 of the first broadband 3dB/90 DEG directional coupler is connected with the first input port 51 of the second broadband cross network, the second output port 421 of the second broadband 3dB/90 DEG directional coupler is connected with the second input port 324 of the second broadband 3dB/90 DEG directional coupler, the second output port 313 of the first broadband phase compensator is connected with the second input port 53 DEG phase compensator, the second output port of the second broadband 3dB/90 DEG directional coupler is connected with the second input port 53 DEG phase compensator, the first output port 333 of the third wideband 3dB/90 ° directional coupler is connected to the first output port 14 of the feed network, the second output port 334 of the third wideband 3dB/90 ° directional coupler is connected to the second output port 15 of the feed network, the first input port 341 of the fourth wideband 3dB/90 ° directional coupler is connected to the second output port 54 of the wideband cross network, the second input port 342 of the fourth wideband 3dB/90 ° directional coupler is connected to the output port 422 of the second wideband phase compensator, the first output port 343 of the fourth wideband 3dB/90 ° directional coupler is connected to the third output port 16 of the feed network, and the second output port 344 of the fourth wideband 3dB/90 ° directional coupler is connected to the fourth output port 17 of the feed network.
Further, when a signal is inputted from the first input port 11 of the feeding network, the inputted signal is isopower-transferred to the first broadband 3dB/90 ° directional coupler 31 and the second broadband 3dB/90 ° directional coupler 32 through the broadband isopower splitter 6, then the first broadband 3dB/90 ° directional coupler 31 splits the signal into the first broadband phase compensator 41 and the broadband crossover network 5, then the first broadband phase compensator 41 inputs the signal into the third broadband 3dB/90 ° directional coupler 33, and the broadband crossover network 5 inputs the signal into the fourth broadband 3dB/90 ° directional coupler 34;
meanwhile, the second broadband 3dB/90 directional coupler 32 distributes the signal into the second broadband phase compensator 42 and the broadband crossover network 5, and then the second broadband phase compensator 42 inputs the signal into the fourth broadband 3dB/90 directional coupler 34, and the broadband crossover network 5 inputs the signal into the third broadband 3dB/90 directional coupler 33;
and finally, the four output ports of the feed network output signals with equal amplitude and equal phase difference.
Further, when a signal is input from the second input port 12 of the feed network, the signal is input to the first broadband phase compensator 41 and the broadband cross network 5 through the first broadband 3dB/90 ° directional coupler 31, then one signal is input to the third broadband 3dB/90 ° directional coupler 33 through the first broadband phase compensator, the other signal is input to the fourth broadband 3dB/90 ° directional coupler 34 through the broadband cross network 5, and finally the four output ports of the feed network output equal amplitude and the phase difference of the adjacent output ports is +90°;
When signals are input from the third input port 13 of the feed network, the signals are input to the second broadband phase compensator 42 and the broadband cross network 5 through the second broadband 3dB/90 directional coupler 32, signals with equal power and +90 DEG phase difference are input to the fourth broadband 3dB/90 DEG directional coupler 34 through the second broadband phase compensator, the other signals are input to the third broadband 3dB/90 DEG directional coupler 33 through the broadband cross network 5, and finally the four output ports of the feed network output equal amplitude and the phase difference of the adjacent output ports is-90 deg.
Further, when a signal is input from the first input port 311 of the first broadband 3dB/90 ° directional coupler, the first output port 313 of the first broadband 3dB/90 ° directional coupler and the second output port 314 of the first broadband 3dB/90 ° directional coupler output an equal-power, i.e., 3dB, signal, and the difference between the signal phase of the first output port 313 of the first broadband 3dB/90 ° directional coupler and the signal phase of the second output port 314 of the first broadband 3dB/90 ° directional coupler is-90 °; when a signal is input from the second input port 312 of the first broadband 3dB/90 ° directional coupler, the first output port 313 of the first broadband 3dB/90 ° directional coupler and the second output port 314 of the first broadband 3dB/90 ° directional coupler output equal-power, i.e., 3dB, signals, and the difference in signal phase of the first output port 313 of the first broadband 3dB/90 ° directional coupler and the signal phase of the second output port 314 of the first broadband 3dB/90 ° directional coupler is +90°.
Further, when a signal is input from the first input port 321 of the second broadband 3dB/90 ° directional coupler, the first output port 323 of the second broadband 3dB/90 ° directional coupler and the second output port 324 of the second broadband 3dB/90 ° directional coupler output an equal power, i.e., 3dB signal, and the difference between the signal phase of the first output port 323 of the second broadband 3dB/90 ° directional coupler and the signal phase of the second output port 324 of the second broadband 3dB/90 ° directional coupler is-90 °; when a signal is input from the second input port 322 of the second broadband 3dB/90 ° directional coupler, the first output port 323 of the second broadband 3dB/90 ° directional coupler and the second output port 324 of the second broadband 3dB/90 ° directional coupler output equal-power, i.e., 3dB, signals, and the difference in signal phase of the first output port 323 of the second broadband 3dB/90 ° directional coupler and the second output port 324 of the second broadband 3dB/90 ° directional coupler is +90°.
Further, when a signal is input from the first input port 331 of the third broadband 3dB/90 ° directional coupler, the first output port 333 of the third broadband 3dB/90 ° directional coupler and the second output port 334 of the third broadband 3dB/90 ° directional coupler output an equal-power, i.e., 3dB, signal, and the difference between the signal phase of the first output port 333 of the third broadband 3dB/90 ° directional coupler and the signal phase of the second output port 334 of the third broadband 3dB/90 ° directional coupler is-90 °; when a signal is input from the second input port 332 of the third broadband 3dB/90 ° directional coupler, the first output port 333 of the third broadband 3dB/90 ° directional coupler and the second output port 334 of the third broadband 3dB/90 ° directional coupler output equal-power, i.e., 3dB, signals, and the difference in signal phase of the first output port 333 of the third broadband 3dB/90 ° directional coupler and the signal phase of the second output port 334 of the third broadband 3dB/90 ° directional coupler is +90°.
Further, when a signal is input from the first input port 341 of the fourth broadband 3dB/90 ° directional coupler, the first output port 343 of the fourth broadband 3dB/90 ° directional coupler and the second output port 344 of the fourth broadband 3dB/90 ° directional coupler output an equal-power, i.e., 3dB, signal, and the difference between the signal phase of the first output port 343 of the fourth broadband 3dB/90 ° directional coupler and the signal phase of the second output port 344 of the fourth broadband 3dB/90 ° directional coupler is-90 °; when a signal is input from the second input port 342 of the fourth broadband 3dB/90 ° directional coupler, the first output port 343 of the fourth broadband 3dB/90 ° directional coupler and the second output port 344 of the fourth broadband 3dB/90 ° directional coupler output equal-power, i.e., 3dB, signals, and the difference in signal phase of the first output port 343 of the fourth broadband 3dB/90 ° directional coupler and the signal phase of the second output port 344 of the fourth broadband 3dB/90 ° directional coupler is +90°.
Further, when a signal is inputted from the input port 411 of the first wideband phase compensator, the output port 412 of the first wideband phase compensator is outputted without loss and with a phase shift of-90 °, and the implemented function is kept stable in a wideband range; when a signal is input from the input port 421 of the second wideband phase compensator, the output port 422 of the second wideband phase compensator is output loss-free with a phase shift of-90 deg., and the implemented function remains stable over a wide band.
Further, when a signal is input from the first input port 51 of the broadband crossover network, the signal is output from the second output port 54 of the broadband crossover network without loss, the first input port 51 of the broadband crossover network 5 is used for transmitting the signal from the upper microstrip line 25 to the lower microstrip line 26 without loss, and the implemented function can be kept stable in the broadband range.
When a signal is input from the second input port 52 of the broadband crossover network, the signal is output from the first output port 53 of the broadband crossover network without loss, and the second input port 52 of the broadband crossover network is used for transmitting the signal from the lower microstrip line 26 to the upper microstrip line 25 without loss, so that the implemented function can be kept stable in the broadband range.
Further, when a signal is input from the first input port 61 of the broadband equal power divider, the first output port 62 of the broadband equal power divider and the second output port 63 of the broadband equal power divider output signals having the same amplitude, the broadband equal power divider 6 is used to equally divide the power of the signal into the upper microstrip line 25 and the lower microstrip line 26, and the implemented function can be kept stable in the broadband range.
Compared with the prior art, the invention has the following advantages and effects:
1. the invention is different from the traditional Butler matrix input end structure, and adopts 3 input ports.
2. While the conventional butler matrix cannot provide a signal with a phase difference of zero and thus cannot generate a beam in the vertical direction, the present invention can provide a signal with a phase difference of zero and thus can generate a beam in the vertical direction.
3. The 3X 4 Butler matrix disclosed by the invention can generate signals with equal amplitude and same phase difference in the frequency range of 2GHz-4GHz, and can work in a very wide frequency range.
4. The 3X 4 Butler matrix feed network disclosed by the invention utilizes the coupling characteristic of the broadband band-pass filter to compensate signal difference so as to replace the defect that the phase of the traditional transmission line is inconsistent in broadband frequency.
5. The broadband equal power divider used in the 3X 4 Butler matrix feed network disclosed by the invention is designed on the basis of a coupler, and the power divider is easier to adjust than the traditional power divider.
6. The 3X 4 Butler matrix feed network disclosed by the invention has the advantages of simple and compact structure, simplicity in processing, light weight, low processing cost, wide working bandwidth and good application prospect.
Drawings
FIG. 1 is a block diagram of a wideband 3X 4 Butler matrix feed network disclosed in the present invention;
FIG. 2 is a dielectric block diagram of a wideband 3X 4 Butler matrix feed network disclosed in the present invention;
fig. 3 is a block diagram of a 3dB/90 directional coupler used in a wideband 3 x 4 butler matrix feed network in accordance with the present invention;
FIG. 4 is a block diagram of a wideband phase compensator for use in a wideband 3X 4 Butler matrix feed network as disclosed in the present invention;
fig. 5 is a block diagram of a wideband crossover network used in a wideband 3 x 4 butler matrix feed network as disclosed in the present invention;
fig. 6 is a block diagram of a wideband equal power divider used in a wideband 3×4 butler matrix feed network disclosed in the present invention;
fig. 7 is a schematic diagram of a wideband 3 x 4 butler matrix feed network connection as disclosed in the present invention;
fig. 8 is a diagram of simulation results when a first input port of a feed network in a broadband 3×4 butler matrix feed network disclosed in the present invention is fed;
fig. 9 is a diagram of simulation results when a second input port of a feeding network in a broadband 3×4 butler matrix feeding network disclosed in the present invention is fed;
FIG. 10 is a graph of simulation results of phase differences between adjacent output ports of a wideband 3X 4 Butler matrix feed network disclosed in the present invention when signals are input at each input port;
wherein the first input port of the 11-feed network, the second input port of the 12-feed network, the third input port of the 13-feed network, the first output port of the 14-feed network, the second output port of the 15-feed network, the third output port of the 16-feed network, the fourth output port of the 17-feed network; 20-a first grounding plate, 21-a second grounding plate, 22-a first dielectric plate, 23-a second dielectric plate, 24-a third dielectric plate, 25-a lower microstrip line and 26-an upper microstrip line; 31-a first broadband 3dB/90 DEG directional coupler, 311-a first input port of the first broadband 3dB/90 DEG directional coupler, 312-a second input port of the first broadband 3dB/90 DEG directional coupler, 313-a first output port of the first broadband 3dB/90 DEG directional coupler, 314-a second output port of the first broadband 3dB/90 DEG directional coupler; 32-a second broadband 3dB/90 DEG directional coupler, 321-a first input port of the second broadband 3dB/90 DEG directional coupler, 322-a second input port of the second broadband 3dB/90 DEG directional coupler, 323-a first output port of the second broadband 3dB/90 DEG directional coupler, 324-a second output port of the second broadband 3dB/90 DEG directional coupler; 33-third broadband 3dB/90 ° directional coupler, 331-first input port of third broadband 3dB/90 ° directional coupler, 332-second input port of third broadband 3dB/90 ° directional coupler, 333-first output port of third broadband 3dB/90 ° directional coupler, 334-second output port of third broadband 3dB/90 ° directional coupler; 34-fourth broadband 3dB/90 ° directional coupler, 341-first input port of fourth broadband 3dB/90 ° directional coupler, 342-second input port of fourth broadband 3dB/90 ° directional coupler, 343-first output port of fourth broadband 3dB/90 ° directional coupler, 344-second output port of fourth broadband 3dB/90 ° directional coupler; 41-a first wideband phase compensator, 411-an input port of the first wideband phase compensator, 412-an output port of the first wideband phase compensator; 42-second wideband phase compensator, 421-input port of second wideband phase compensator, 422-output port of second wideband phase compensator; a 5-broadband crossover network, a first input port of a 51-broadband crossover network, a second input port of a 52-broadband crossover network, a first output port of a 53-broadband crossover network, a second output port of a 54-broadband crossover network; 6-broadband equal power divider.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Examples
Referring to fig. 1 and 2, the 3×4 butler matrix feeding network for broadband disclosed in this embodiment includes a first dielectric plate 22, a second dielectric plate 23, and a third dielectric plate 24 that are stacked from bottom to top, where a first grounding plate 20 is disposed on a lower surface of the first dielectric plate 22, a second grounding plate 21 is disposed on an upper surface of the third dielectric plate, an upper microstrip line 26 is disposed between the third dielectric plate 24 and the second dielectric plate 23, and a lower microstrip line 25 is disposed between the first dielectric plate 22 and the second dielectric plate 23;
the feed network further comprises a first broadband 3dB/90 DEG directional coupler 31, a second broadband 3dB/90 DEG directional coupler 32, a third broadband 3dB/90 DEG directional coupler 33, a fourth broadband 3dB/90 DEG directional coupler 34 which are formed by an upper layer microstrip line 26 and a lower layer microstrip line 25, a first input port 11 of the feed network which is formed by a second grounding plate 21 and the upper layer microstrip line 26, a second input port 12 of the feed network, a third input port 13 of the feed network which is formed by the first grounding plate 20 and the lower layer microstrip line 25, a first output port 14 of the feed network which is formed by the second grounding plate 21 and the upper layer microstrip line 26, a third output port 16 of the feed network, a second output port 15 of the feed network which is formed by the first grounding plate 20 and the lower layer microstrip line 25, a broadband crossover network 5 which is formed by the upper layer microstrip line 26 and the lower layer microstrip line 25, a first broadband phase compensator 41 which is formed by the upper layer microstrip line 26 and the lower layer microstrip line 25, a second broadband phase compensator 41 which is formed by the upper layer microstrip line 26 and the lower layer microstrip line 25, and the like.
In the design of this embodiment, the dielectric constants of the first dielectric plate 22, the second dielectric plate 23 and the third dielectric plate 24 are all 2.55, and the loss tangent is 0.0029. The thickness of the first dielectric plate 22 and the third dielectric plate 4 is 1.5 mm; the thickness of the second dielectric plate 23 is 0.25 mm.
Referring to fig. 3, a wideband 3dB/90 directional coupler in a wideband 3 x 4 butler matrix feed network of the present invention is shown. The figure includes a first input port 311 of a first wideband 3dB/90 directional coupler, a second input port 312 of the first wideband 3dB/90 directional coupler; including a first output port 313 of the first broadband 3dB/90 directional coupler, and a second output port 314 of the first broadband 3dB/90 directional coupler. The figure includes a first input port 321 of a second wideband 3dB/90 DEG directional coupler, and a second input port 322 of the second wideband 3dB/90 DEG directional coupler; a first output port 323 including a second wideband 3dB/90 directional coupler, a second output port 324 including a second wideband 3dB/90 directional coupler. The figure includes a first input port 331 of a third wideband 3dB/90 ° directional coupler, a second input port 332 of the third wideband 3dB/90 ° directional coupler; a first output port 333 comprising a third wideband 3dB/90 deg. directional coupler, a second output port 334 comprising a third wideband 3dB/90 deg. directional coupler. The figure includes a first input 341 of a fourth wideband 3dB/90 deg. directional coupler, a second input 342 of a fourth wideband 3dB/90 deg. directional coupler; including a first output port 343 of a fourth wideband 3dB/90 deg. directional coupler, a second output port 344 of a fourth wideband 3dB/90 deg. directional coupler. When a signal is input from the first input port 311 of the first broadband 3dB/90 ° directional coupler, the first output port 313 of the first broadband 3dB/90 ° directional coupler and the second output port 314 of the first broadband 3dB/90 ° directional coupler output equal-power, i.e., 3dB, signals, and the difference between the signal phase of the first output port 313 of the first broadband 3dB/90 ° directional coupler and the signal phase of the second output port 314 of the first broadband 3dB/90 ° directional coupler is-90 °; when a signal is input from the second input port 312 of the first broadband 3dB/90 ° directional coupler, the first output port 313 of the first broadband 3dB/90 ° directional coupler and the second output port 314 of the first broadband 3dB/90 ° directional coupler will output an equal power, i.e., 3dB, signal, and the difference between the signal phase of the first output port 313 of the first broadband 3dB/90 ° directional coupler and the signal phase of the second output port 314 of the first broadband 3dB/90 ° directional coupler is +90°; the other three wideband 3dB/90 DEG directional couplers operate in the same principle.
When a signal is input from the first input port 321 of the second broadband 3dB/90 ° directional coupler, the first output port 323 of the second broadband 3dB/90 ° directional coupler and the second output port 324 of the second broadband 3dB/90 ° directional coupler will output an equal power, i.e., a 3dB signal, and the difference between the signal phase of the first output port 323 of the second broadband 3dB/90 ° directional coupler and the signal phase of the second output port 324 of the second broadband 3dB/90 ° directional coupler is-90 °; when a signal is input from the second input port 322 of the second broadband 3dB/90 ° directional coupler, the first output port 323 of the second broadband 3dB/90 ° directional coupler and the second output port 324 of the second broadband 3dB/90 ° directional coupler output equal power, i.e., 3dB, signals, and the difference between the signal phase of the first output port 323 of the second broadband 3dB/90 ° directional coupler and the signal phase of the second output port 324 of the second broadband 3dB/90 ° directional coupler is +90°.
When a signal is input from the first input port 331 of the third broadband 3dB/90 ° directional coupler, the first output port 333 of the third broadband 3dB/90 ° directional coupler and the second output port 334 of the third broadband 3dB/90 ° directional coupler output equal power, i.e., 3dB, signals, and the difference between the signal phase of the first output port 333 of the third broadband 3dB/90 ° directional coupler and the signal phase of the second output port 334 of the third broadband 3dB/90 ° directional coupler is-90 °; when a signal is input from the second input port 332 of the third broadband 3dB/90 ° directional coupler, the first output port 333 of the third broadband 3dB/90 ° directional coupler and the second output port 334 of the third broadband 3dB/90 ° directional coupler output equal power, i.e., 3dB, signals, and the difference in signal phase of the first output port 333 of the third broadband 3dB/90 ° directional coupler and the signal phase of the second output port 334 of the third broadband 3dB/90 ° directional coupler is +90°.
When a signal is input from the first input port 341 of the fourth broadband 3dB/90 ° directional coupler, the first output port 343 of the fourth broadband 3dB/90 ° directional coupler and the second output port 344 of the fourth broadband 3dB/90 ° directional coupler output an equal-power, i.e., 3dB, signal, and the difference between the signal phase of the first output port 343 of the fourth broadband 3dB/90 ° directional coupler and the signal phase of the second output port 344 of the fourth broadband 3dB/90 ° directional coupler is-90 °; when a signal is input from the second input port 342 of the fourth broadband 3dB/90 directional coupler, the first output port 343 of the fourth broadband 3dB/90 directional coupler and the second output port 344 of the fourth broadband 3dB/90 directional coupler output equal-power, i.e., 3dB, signals, and the difference between the signal phase of the first output port 343 of the fourth broadband 3dB/90 directional coupler and the signal phase of the second output port 344 of the fourth broadband 3dB/90 directional coupler is +90°.
Referring to fig. 4, a wideband phase compensator in a wideband 3 x 4 butler matrix feed network of the present invention is shown. The figure comprises an input port 411 of a first wideband phase compensator and an output port 412 of the first wideband phase compensator, an input port 421 of a second wideband phase compensator and an output port 422 of the second wideband phase compensator. When a signal is inputted from the input port 411 of the first wideband phase compensator, the output port 412 of the first wideband phase compensator is outputted without loss with a phase shift of-90 °, and the implemented function can be kept stable in a wideband range. The function of the second wideband phase compensator is the same as the function of the first wideband phase compensator. When a signal is inputted from the input port 421 of the second wideband phase compensator, the output port 422 of the second wideband phase compensator is outputted without loss with a phase shift of-90 °, and the implemented function can be kept stable in a wideband range.
Referring to fig. 5, a broadband crossover network in a broadband 3 x 4 butler matrix feed network of the present invention is shown. The figure comprises a first input port 51 of the broadband crossover network, a second input port 52 of the broadband crossover network, a first output port 53 of the broadband crossover network, and a second output port 54 of the broadband crossover network. When a signal is input from the first input port 51 of the broadband crossover network, the signal is output from the second output port 54 of the broadband crossover network without loss, and the first input port 51 of the broadband crossover network 5 mainly acts to transmit the signal from the upper microstrip line 25 to the lower microstrip line 26 without loss, so that the implemented function can be kept stable in the broadband range.
When a signal is input from the second input port 52 of the broadband crossover network, the signal is output from the first output port 53 of the broadband crossover network without loss, and the second input port 52 of the broadband crossover network mainly acts to transmit the signal from the lower microstrip line 26 to the upper microstrip line 25 without loss, so that the implemented function can be kept stable in the broadband range.
Referring to fig. 6, a broadband equal power splitter in a broadband 3 x 4 butler matrix feed network of the present invention is shown. The figure comprises a first input port 61 of a broadband equal power divider, a first output port 62 of the broadband equal power divider, and a second output port 63 of the broadband equal power divider. When a signal is input from the first input port 61 of the broadband equal power divider, the first output port 62 of the broadband equal power divider and the second output port 63 of the broadband equal power divider output signals with equal amplitudes, the main function of the broadband equal power divider 6 is to equally divide the power of the signal into the upper microstrip line 25 and the lower microstrip line 26, and the implemented functions can be kept stable in the broadband range.
Referring to fig. 7, a schematic diagram of a broadband 3×4 butler matrix feed network is provided in this embodiment. The first input port 11 of the feed network is connected to the first input port 61 of the broadband equal power divider; the first output port 62 of the broadband equal power splitter is connected to the second input port 312 of the first broadband 3dB/90 directional coupler; the second output port 63 of the broadband equal power splitter is connected with the first input port 321 of the second broadband 3dB/90 directional coupler; the second input port 12 of the feed network is connected to the first input port 311 of the first broadband 3dB/90 directional coupler; the third input port 13 of the feed network is connected to the second input port 322 of the second broadband 3dB/90 directional coupler; the first output port 313 of the first wideband 3dB/90 directional coupler is connected to the input port 411 of the first wideband phase compensator; the second output port 314 of the first broadband 3dB/90 directional coupler is connected to the first input port 51 of the broadband crossover network; the second output port 324 of the second wideband 3dB/90 directional coupler is connected to the input port 421 of the second wideband phase compensator; the first output port 323 of the second broadband 3dB/90 directional coupler is connected with the second input port 52 of the broadband crossover network; the first input port 331 of the third wideband 3dB/90 ° directional coupler is connected to the output port 412 of the first wideband phase compensator; the second input port 332 of the third broadband 3dB/90 directional coupler is connected to the first output port 53 of the broadband crossover network; the first output port 333 of the third broadband 3dB/90 deg. directional coupler is connected with the first output port 14 of the feed network; the second output port 334 of the third broadband 3dB/90 directional coupler is connected to the second output port 15 of the feed network; the first input port 341 of the fourth broadband 3dB/90 ° directional coupler is connected to the second output port 54 of the broadband crossover network; the second input port 342 of the fourth wideband 3dB/90 directional coupler is connected to the output port 422 of the second wideband phase compensator; the first output port 343 of the fourth broadband 3dB/90 deg. directional coupler is connected to the third output port 16 of the feed network; the second output port 344 of the fourth broadband 3dB/90 directional coupler is connected to the fourth output port 17 of the feed network; the connecting line used is a 50 Ω microstrip line.
When a signal is input from the first input port 11 of the feed network, the input signal is equi-power transferred to the first broadband 3dB/90 deg. directional coupler 31 and the second broadband 3dB/90 deg. directional coupler 32 through the broadband equi-power splitter 6. Subsequently, the first wideband 3dB/90 directional coupler 31 distributes the signal into the first wideband phase compensator 41 and the wideband crossover network 5, and then the first wideband phase compensator 41 inputs the signal into the third wideband 3dB/90 directional coupler 33 and the wideband crossover network 5 inputs the signal into the fourth wideband 3dB/90 directional coupler 34. Whereas the signal transmission analysis in the second wideband 3dB/90 deg. directional coupler 32 is the same as the signal transmission analysis in the first wideband 3dB/90 deg. directional coupler 31. The second wideband 3dB/90 directional coupler 32 distributes the signal into the second wideband phase compensator 42 and the wideband crossover network 5, then the second wideband phase compensator 42 inputs the signal into the fourth wideband 3dB/90 directional coupler 34 and the wideband crossover network 5 inputs the signal into the third wideband 3dB/90 directional coupler 33.
And finally, the four output ports of the feed network can output signals with equal amplitude and equal phase difference.
When signals are input from the second input port 12 of the feed network, the signals are input to the first broadband phase compensator 41 and the broadband cross network 5 through the first broadband 3dB/90 DEG directional coupler 31, signals with equal power and-90 DEG phase difference are input to the third broadband 3dB/90 DEG directional coupler 33 through the first broadband phase compensator, the other signals are input to the fourth broadband 3dB/90 DEG directional coupler 34 through the broadband cross network 5, and finally the four output ports of the feed network can output signals with equal amplitude and the phase difference of the adjacent output ports is +90 deg.
When a signal is input from the third input port 13 of the feed network, the analysis is identical to the second input port 12 of the feed network, except that the output signals are out of phase by-90 °. The signals are respectively input into the second broadband phase compensator 42 and the broadband cross network 5 through the second broadband 3dB/90 DEG directional coupler 32, then one path of signals are input into the fourth broadband 3dB/90 DEG directional coupler 34 through the second broadband phase compensator, the other path of signals are input into the third broadband 3dB/90 DEG directional coupler 33 through the broadband cross network 5, finally, four output ports of the feed network can output signals with equal amplitude and the phase difference of adjacent output ports is-90 deg.
Referring to fig. 8, there is shown the simulation results of a broadband 3 x 4 butler matrix feed network of the present invention when fed from the first input port 11 of the feed network. From the simulation results, it can be seen that each output port outputs substantially equal power in the 2GHz-4GHz range.
Referring to fig. 9, simulation results of a broadband 3 x 4 butler matrix feed network of the present invention when fed from the second input port 12 of the feed network are shown. From the simulation results, it can be seen that each output port outputs substantially equal power in the 2GHz-4GHz range.
Referring to fig. 10, a broadband 3 x 4 butler matrix feed network of the present invention is shown with the phase differences of adjacent output ports as signals are input at each input port. From the simulation results, it can be seen that the phase difference between the respective output ports is substantially stable in the range of 2GHz to 4 GHz. When a signal is input from the first input port 11 of the feed network, the phase difference of the output ports is 0 DEG, which is shown as P1 in the figure; when a signal is input from the second input port 12 of the feed network, the phase difference of the output ports is +90°, shown as P2 in the figure; when a signal is input from the third input port 13 of the feed network, the phase difference of the output ports is-90 °, shown as P3. The characteristics of the matrix conform to the characteristics of the butler matrix well, and are different from the traditional butler phase distribution. The working bandwidth also reaches 2GHz-4GHz, and a frequency multiplication range is achieved. P4-P5 in the figure represent the signal of the first output port 14 of the feed network minus the signal of the second output port 15 of the feed network. P5-P6 in the figure represent the signal of the second output port 15 of the feed network minus the signal of the third output port 15 of the feed network. P6-P7 in the figure represent the signal of the third output port 15 of the feed network minus the signal of the fourth output port 17 of the feed network.
The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the equivalent manner, and the embodiments are included in the protection scope of the present invention.
Claims (10)
1. The broadband 3X 4 Butler matrix feed network is characterized by comprising a first dielectric plate (22), a second dielectric plate (23) and a third dielectric plate (24) which are arranged in a stacked mode from bottom to top, wherein a first grounding plate (20) is arranged on the lower surface of the first dielectric plate (22), a second grounding plate (21) is arranged on the upper surface of the third dielectric plate, an upper microstrip line (26) is arranged between the third dielectric plate (24) and the second dielectric plate (23), and a lower microstrip line (25) is arranged between the first dielectric plate (22) and the second dielectric plate (23);
the feed network further comprises a first broadband 3dB/90 directional coupler (31) consisting of an upper microstrip line (26) and a part of a lower microstrip line (25), a second broadband 3dB/90 directional coupler (32), a third broadband 3dB/90 directional coupler (33), a fourth broadband 3dB/90 directional coupler (34), a first input port (11) of the feed network consisting of a second ground plate (21) and a part of an upper microstrip line (26), a second input port (12) of the feed network, a third input port (13) of the feed network consisting of a first ground plate (20) and a part of a lower microstrip line (25), a first output port (14) of the feed network consisting of a second ground plate (21) and a part of an upper microstrip line (26), a third output port (16) of the feed network consisting of a first ground plate (20) and a part of a lower microstrip line (25), a second output port (15) of the feed network consisting of a fourth ground plate (20) and a part of a lower microstrip line (26), a fourth input port (12) of the feed network, a third input port (13) of the feed network consisting of a first ground plate (20) and a part of a lower microstrip line (25), a phase compensator (41) of the upper microstrip line (25) consisting of a wideband (26) and a part of a microstrip line (25), a broadband equal power divider (6) composed of a part of the upper microstrip line (26) and a part of the lower microstrip line (25);
The first input port (11) of the feed network is connected with the first input port (61) of a broadband equal power divider, the first output port (62) of the broadband equal power divider is connected with the second input port (312) of a first broadband 3dB/90 DEG directional coupler, the second output port (63) of the broadband equal power divider is connected with the first input port (321) of a second broadband 3dB/90 DEG directional coupler, the second input port (12) of the feed network is connected with the first input port (311) of the first broadband 3dB/90 DEG directional coupler, the third input port (13) of the feed network is connected with the second input port (322) of the second broadband 3dB/90 DEG directional coupler, the first output port (313) of the first broadband 3dB/90 DEG directional coupler is connected with the input port (411) of the first broadband phase compensator, the second output port (314) of the first broadband 3dB/90 DEG directional coupler is connected with the second input port (311) of the second broadband 3dB/90 DEG directional coupler, the second input port (324) of the first broadband 3dB/90 DEG directional coupler is connected with the second input port (314) of the second broadband 3dB/90 DEG directional coupler, the first input port (331) of the third wideband 3dB/90 ° directional coupler is connected to the output port (412) of the first wideband phase compensator, the second input port (332) of the third wideband 3dB/90 ° directional coupler is connected to the first output port (53) of the wideband cross network, the first output port (333) of the third wideband 3dB/90 ° directional coupler is connected to the first output port (14) of the feed network, the second output port (334) of the third wideband 3dB/90 ° directional coupler is connected to the second output port (15) of the feed network, the first input port (341) of the fourth wideband 3dB/90 ° directional coupler is connected to the second output port (54) of the wideband cross network, the second input port (342) of the fourth wideband 3dB/90 ° directional coupler is connected to the output port (422) of the second wideband phase compensator, the second output port (334) of the fourth wideband 3dB/90 ° directional coupler is connected to the fourth output port (17) of the fourth wideband 3dB/90 ° directional coupler;
When signals are input from a first input port (11) of the feed network, the four output ports of the last feed network output signals with equal amplitude and equal phase difference;
when signals are input from a second input port (12) of the feed network, the four output ports of the last feed network output equal amplitude and the phase difference of the adjacent output ports is +90°;
when a signal is input from a third input port (13) of the feed network, the four output ports of the last feed network output equal amplitudes and the phase difference of adjacent output ports is-90 °.
2. A broadband 3 x 4 butler matrix feed network as claimed in claim 1, characterized in that when a signal is input from a first input port (11) of the feed network, the input signal is equipower transferred via a broadband equipower splitter (6) into a first broadband 3dB/90 ° directional coupler (31) and a second broadband 3dB/90 ° directional coupler (32), then the first broadband 3dB/90 ° directional coupler (31) splits the signal into a first broadband phase compensator (41) and a broadband crossover network (5), then the first broadband phase compensator (41) inputs the signal into a third broadband 3dB/90 ° directional coupler (33), and the broadband crossover network (5) inputs the signal into a fourth broadband 3dB/90 ° directional coupler (34);
Meanwhile, the second broadband 3dB/90 DEG directional coupler (32) distributes signals into the second broadband phase compensator (42) and the broadband cross network (5), then the second broadband phase compensator (42) inputs signals into the fourth broadband 3dB/90 DEG directional coupler (34), and the broadband cross network (5) inputs signals into the third broadband 3dB/90 DEG directional coupler (33);
and finally, the four output ports of the feed network output signals with equal amplitude and equal phase difference.
3. A broadband 3 x 4 butler matrix feed network as claimed in claim 1, characterized in that when signals are input from the second input port (12) of the feed network, the signals are input to the first broadband phase compensator (41) and broadband crossover network (5) respectively through the first broadband 3dB/90 ° directional coupler (31) with equal power and-90 ° phase difference, then one signal is input to the third broadband 3dB/90 ° directional coupler (33) through the first broadband phase compensator, the other signal is input to the fourth broadband 3dB/90 ° directional coupler (34) through the broadband crossover network (5), finally the four output ports of the feed network output equal amplitude and the phase difference of adjacent output ports is +90 °;
When signals are input from a third input port (13) of the feed network, the signals are input to a second broadband phase compensator (42) and a broadband cross network (5) through a second broadband 3dB/90 DEG directional coupler (32) respectively, one signal is input to a fourth broadband 3dB/90 DEG directional coupler (34) through the second broadband phase compensator, the other signal is input to the third broadband 3dB/90 DEG directional coupler (33) through the broadband cross network (5), and finally, four output ports of the feed network output equal amplitude and the phase difference of adjacent output ports is-90 deg.
4. A broadband 3 x 4 butler matrix feed network as claimed in claim 1, characterized in that when a signal is input from the first input port (311) of the first broadband 3dB/90 ° directional coupler, the first output port (313) of the first broadband 3dB/90 ° directional coupler and the second output port (314) of the first broadband 3dB/90 ° directional coupler output equal power, i.e. 3dB, signals, and the difference of the signal phase of the first output port (313) of the first broadband 3dB/90 ° directional coupler and the signal phase of the second output port (314) of the first broadband 3dB/90 ° directional coupler is-90 °; when a signal is input from a second input port (312) of the first broadband 3dB/90 DEG directional coupler, a first output port (313) of the first broadband 3dB/90 DEG directional coupler and a second output port (314) of the first broadband 3dB/90 DEG directional coupler output equal-power, i.e., 3dB, signals, and the difference between the signal phase of the first output port (313) of the first broadband 3dB/90 DEG directional coupler and the signal phase of the second output port (314) of the first broadband 3dB/90 DEG directional coupler is +90 DEG.
5. A broadband 3 x 4 butler matrix feed network as claimed in claim 1, characterized in that when a signal is input from the first input port (321) of the second broadband 3dB/90 ° directional coupler, the first output port (323) of the second broadband 3dB/90 ° directional coupler and the second output port (324) of the second broadband 3dB/90 ° directional coupler output equal power, i.e. 3dB, signals, and the difference of the signal phase of the first output port (323) of the second broadband 3dB/90 ° directional coupler and the signal phase of the second output port (324) of the second broadband 3dB/90 ° directional coupler is-90 °; when a signal is input from a second input port (322) of the second broadband 3dB/90 DEG directional coupler, a first output port (323) of the second broadband 3dB/90 DEG directional coupler and a second output port (324) of the second broadband 3dB/90 DEG directional coupler output a signal of equal power, namely 3dB, and a difference between a signal phase of the first output port (323) of the second broadband 3dB/90 DEG directional coupler and a signal phase of the second output port (324) of the second broadband 3dB/90 DEG directional coupler is +90 DEG.
6. A broadband 3 x 4 butler matrix feed network as claimed in claim 1, wherein when a signal is input from the first input port (331) of the third broadband 3dB/90 ° directional coupler, the first output port (333) of the third broadband 3dB/90 ° directional coupler and the second output port (334) of the third broadband 3dB/90 ° directional coupler output equal power, i.e. 3dB, signals, and the difference in signal phase of the first output port (333) of the third broadband 3dB/90 ° directional coupler and the signal phase of the second output port (334) of the third broadband 3dB/90 ° directional coupler is-90 °; when a signal is input from the second input port (332) of the third broadband 3dB/90 DEG directional coupler, the first output port (333) of the third broadband 3dB/90 DEG directional coupler and the second output port (334) of the third broadband 3dB/90 DEG directional coupler output equal-power, i.e., 3dB, signals, and the difference between the signal phase of the first output port (333) of the third broadband 3dB/90 DEG directional coupler and the signal phase of the second output port (334) of the third broadband 3dB/90 DEG directional coupler is +90 DEG.
7. A broadband 3 x 4 butler matrix feed network according to claim 1, characterized in that when a signal is input from the first input port (341) of the fourth broadband 3dB/90 ° directional coupler, the first output port (343) of the fourth broadband 3dB/90 ° directional coupler and the second output port (344) of the fourth broadband 3dB/90 ° directional coupler output equal power, i.e. 3dB, signals, and the difference of the signal phase of the first output port (343) of the fourth broadband 3dB/90 ° directional coupler and the signal phase of the second output port (344) of the fourth broadband 3dB/90 ° directional coupler is-90 °; when a signal is input from the second input port (342) of the fourth broadband 3dB/90 ° directional coupler, the first output port (343) of the fourth broadband 3dB/90 ° directional coupler and the second output port (344) of the fourth broadband 3dB/90 ° directional coupler output equal-power, i.e., 3dB, signals, and the difference between the signal phase of the first output port (343) of the fourth broadband 3dB/90 ° directional coupler and the signal phase of the second output port (344) of the fourth broadband 3dB/90 ° directional coupler is +90°.
8. A broadband 3 x 4 butler matrix feed network as claimed in claim 1, wherein when a signal is input from the input port (411) of the first broadband phase compensator, the output port (412) of the first broadband phase compensator is lossless-outputted with a-90 ° phase shift and the implemented function remains stable over the broadband range; when a signal is input from the input port (421) of the second wideband phase compensator, the output port (422) of the second wideband phase compensator outputs without loss and with a phase shift of-90 DEG, and the implemented function remains stable over a wideband range.
9. A broadband 3 x 4 butler matrix feed network as claimed in claim 1, wherein when a signal is input from a first input port (51) of a broadband crossover network, the signal is a lossless output signal from a second output port (54) of the broadband crossover network, the first input port (51) of the broadband crossover network is used for lossless transmission of the signal from an upper microstrip line (26) to a lower microstrip line (25), the implemented function being stable over the broadband range;
when a signal is input from a second input port (52) of the broadband crossover network, the signal is output from a first output port (53) of the broadband crossover network without loss, the second input port (52) of the broadband crossover network is used for transmitting the signal from a lower microstrip line (25) to an upper microstrip line (26) without loss, and the realized function can be kept stable in a broadband range.
10. A broadband 3 x 4 butler matrix feed network as claimed in claim 1, characterized in that when signals are input from the first input port (61) of the broadband equal power divider, the first output port (62) of the broadband equal power divider and the second output port (63) of the broadband equal power divider output signals of equal amplitude, the broadband equal power divider (6) is adapted to equally split the signals input to the upper layer microstrip line (26) and the lower layer microstrip line (25), and the implemented functions remain stable over the broadband range.
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| CN105742828A (en) * | 2016-03-31 | 2016-07-06 | 广东通宇通讯股份有限公司 | Dual-polarization three-beam antenna and feed network device thereof |
| CN106229685A (en) * | 2016-09-22 | 2016-12-14 | 京信通信技术(广州)有限公司 | Wave-packet shaping network and dual polarization five beam antenna |
| CN108448221A (en) * | 2018-03-09 | 2018-08-24 | 电子科技大学 | A kind of broad band multilayer micro-strip Butler Wave-packet shaping network matrix arrangements |
| CN207852927U (en) * | 2017-12-28 | 2018-09-11 | 京信通信系统（中国）有限公司 | 3 × 3Butler matrix feed networks and antenna |
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| CN105742828A (en) * | 2016-03-31 | 2016-07-06 | 广东通宇通讯股份有限公司 | Dual-polarization three-beam antenna and feed network device thereof |
| CN106229685A (en) * | 2016-09-22 | 2016-12-14 | 京信通信技术(广州)有限公司 | Wave-packet shaping network and dual polarization five beam antenna |
| CN207852927U (en) * | 2017-12-28 | 2018-09-11 | 京信通信系统（中国）有限公司 | 3 × 3Butler matrix feed networks and antenna |
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