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Single Layered $4\times4$ Butler Matrix Without Phase-Shifters and Crossovers
Traditional design of 4 x 4 Butler matrix (BM) uses couplers, phase shifters (PS) and crossovers. Due to some troublesome issues related to PS and the crossovers involved in the design of BM which degrades its performance, this paper presents a planar 4 x 4 BM without PS and crossovers. It is accomplished with the help of a modified coupler. The modified coupler is realized to have a 45 0 output phase difference which replaces the function of the 45 0 phase shifters. The 45 0 output phasedoi:10.1109/access.2018.2881605 fatcat:eavlhvys7jbrra2j7jwxhyjuza