Planar 16*16 broadband Butler matrix feed network

Abstract

The invention discloses a planar 16*16 broadband Butler matrix feed network. The network is provided with sixteen input ports, sixteen output ports, eight eight-port couplers, four four-port cross couplers and sixteen broadband phase shifters, and when each input port is used for feeding independently, signals with equal amplitude and phase difference of + / -45 DEG or + / -135 DEG of adjacent ordered output ports are output within 2-4 GHz, two-dimensional beam scanning can be provided for a two-dimensional planar antenna array within a broadband range, and compared with a traditional three-dimensional two-dimensional Baut matrix, the three-dimensional planar Butler matrix has the advantages that a three-layer dielectric plate stacked structure is adopted, connection of microstrip circuits between layers does not exist, and complete planarization of the Butler matrix is achieved, so the Butler matrix has the advantages of being simple in design, low in processing cost, small in size and wide in working frequency band.

Description

technical field [0001] The invention relates to the technical field of communication antennas, in particular to a plane 16×16 broadband Butler matrix feeding network. Background technique [0002] With the rapid development of wireless communication technology, there are higher requirements for the capacity and transmission rate of the communication system. In order to achieve this requirement, the working frequency of 5G communication has also been increased, and higher frequency will bring greater loss. The multi-beam antenna has the characteristics of high gain, narrow beam, and strong anti-interference ability, which is an excellent solutions to address the above problems. As an important part of antenna beam switching, the Butler matrix has become one of the research hotspots in recent years, especially the two-dimensional Butler matrix. At present, most scholars' research on the Butler matrix is ​​one-dimensional. For most wireless communication systems, it is necess...

AI Technical Summary

Problems solved by technology

In this feed network, double-layer back-to-back microstrip lines are used to realize it, specifically by using eight eight-port couplers and four sets of phase shifters, but the network cannot achieve a single-layer structure, and the operating frequency band is narrow

[0005] In 2020, Jiwei Lian et al. proposed a 16×16 planar two-dimensional beamforming network based on substrate integrated waveguides. The beamforming network uses eight eight-port couplers, two eight-port cross couplers , four four-port cross couplers to achieve, in the process of realization, the size of the feed network plane is relatively large, reaching the size of 22λ×16.7λ, resulting in a large insertion loss

At the same time, the introduction of the eight-port cross coupler brings unnecessary high-order mode

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