Butler matrix based on substrate integrated waveguide and multi-beam antenna

Abstract

The invention provides a Butler matrix based on a substrate integrated waveguide and a multi-beam antenna. The Butler matrix is characterized in that an output port of a first power divider is respectively connected with an input port and a fifth output port of a third phase shifter; the output port of the second power divider is connected with the input port of the fourth phase shifter and the sixth output port, and the output port of the third power divider is connected with the input port of the fifth phase shifter and the seventh output port. The output port of the fourth power divider is respectively connected with the input port and the eighth output port of the sixth phase shifter; the output port of the third phase shifter is connected with the first output port, the output port of the fourth phase shifter is connected with the second output port, the output port of the fifth phase shifter is connected with the third output port, and the output port of the sixth phase shifter is connected with the fourth output port. The frequency divider can be reduced from original five groups to one group through the double-layer Butler matrix, so that the use volume is reduced, and the processing cost is low.

Description

technical field [0001] The present application relates to the field of wireless communication, in particular to a Butler matrix and multi-beam antenna based on a substrate integrated waveguide. Background technique [0002] The Butler matrix is ​​a popular beamforming network used in multi-beam array antennas. Compared with other beamforming networks such as mirrors and Rotman lenses, Butler matrices have the advantages of broadband and flexible configuration. [0003] The classical Butler matrix is ​​an N×N network for generating uniform magnitude and linear phase distributions. In fact, based on antenna array theory, the sidelobe level of a uniformly excited linear array is about –13 dB. Furthermore, considering the mutual coupling between the elements, the achieved sidelobe level is about –10 dB. An effective method for sidelobe suppression is to use a tapered amplitude profile. Based on this approach, the 4×8 Butler matrix is ​​a very popular beamforming network for ...

AI Technical Summary

Problems solved by technology

The main factor of the complex structure is the introduction of a large number of waveguide cross structures in the classic 4×8 Butler matrix

[0005] refer to figure 1 , is a schematic diagram of a classic Butler matrix. For such an eight-output (#5-#12) Butler matrix, there are five groups of waveguide intersections in the classic 4 × 8 Butler matrix, which usually leads to the classic 4 × 8 Butler matrix is ​​very complex and bulky

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