A high-power second-order and n-order butler matrix based on rectangular waveguide
A rectangular waveguide, high-power technology, applied in the field of passive phased array radar, can solve the problems of difficult phase shift, difficult phase difference of output signal, difficult to apply, etc., and achieve the effect of high power, low loss and low loss
Active Publication Date: 2020-05-01
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Although the above implementation is simple and low in cost, because the electrical length of the microstrip line is related to the frequency, it is difficult to have a relatively flat phase shift in the working frequency band, and it is difficult for the output signal of the Butler matrix to be formed by the above implementation in a wide range. In addition, the Butler matrix composed of microstrip transmission lines is difficult to apply to beamforming occasions with high peak power and high average power, such as: using shorter wavelengths (C-band, X-band, Ku-band and millimeter wave band) centralized high-power transmitter or passive phased array radar with several high-power transmitters
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[0037] In order to make the technical features and technical content of the present invention clearer, the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments:
[0038] The Butler matrix is an N×N network consisting of directional couplers and phase shifters with fixed phase shifts. The essence of the Butler matrix is to distribute the energy of the incident wave into different paths, and finally reach different output ports. In an ideal matrix, each input port or each output port is isolated from each other, and the signal is input from the input port and then According to the power level, it is evenly distributed to each output port output, and at the same time, a constant phase difference is maintained between the output signals of each output port, so that the main beam of the antenna array points to a fixed direction. Different input ports correspond to different phase differences, so that the main...
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The invention provides a high-power second-order and N-order Butler matrix based on a rectangular waveguide, belonging to the technical field of passive phased array radar. The present invention adopts a microwave transmission line method different from the traditional planar microstrip line—rectangular waveguide. The rectangular waveguide has the advantages of lower loss and higher power. The present invention is based on the ferrite difference phase shift section designed by the rectangular waveguide. The phase shifter makes the output signal have a relatively flat phase difference and low loss in the operating frequency band, which is beneficial to be applied to high-power beamforming occasions; °The three-port device formed by the combination of rectangular waveguide ferrite difference phase-shift pairs replaces the conventional 3dB coupling bridge used at the input end. Through this improvement, the switch selection feature is incorporated into the system, making the input port of the signal The number is halved, and the number of stages of the Butler matrix front-end switch in the beamforming system is simplified.
Description
technical field [0001] The invention belongs to the technical field of passive phased array radar, in particular to a high-power second-order and N-order Butler matrix based on a rectangular waveguide. Background technique [0002] A smart antenna is an antenna array with direction-finding and beam-forming capabilities. It was originally widely used in radar, sonar, and military communications. A smart antenna is an antenna technology that can adjust or select its own parameters according to its own electromagnetic environment, so as to maintain the best communication status. According to its working principle, it can be divided into the following two categories: multi-beam smart antenna and adaptive smart antenna. In comparison, adaptive smart antennas have better performance, but due to the disadvantages of complex system algorithms, slow transient response, and high cost, their wide application in practice still needs time. In the multi-beam smart antenna, as a common i...
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IPC IPC(8): H01Q1/50H01Q21/00
CPCH01Q1/50H01Q21/00
Inventor 刘颖力高黎文王雨刘谦巫崇胜曾千骞张怀武
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA