An Innovative Ultra Wideband Microstrip Phase Shifter Based on the LANGE Coupler

Abstract

Abstract:The method presented in this paper is beased on coupled line in the standard schiffman phase shifters structure and replace it with lange coupler. To having a wider bandwidth, the stronger coupling is required. One way to achieve strong coupling is using of the parallel coupled lines that this property exist in the lange coupler. So this paper discusses the design of fixed broadband phase shifter by using the lange coupler and a novel phase shifters will be introduced according to the standard schiffman phase shifters. Finally optimal parameters to achieve the desired performance will be shown.

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“…From this figure, it can be seen that the group delay of the crossover is more than twice of that of the microstrip line. Therefore, well-known wideband planar designs of Shiffman phase shifter [28], Lange coupler based phase shifters [29,30], or T-shaped open stub [31] and open-short stub phase shifters [32] cannot be used in the proposed Butler matrix design as they provide unit group delay ratio, whereas this particular crossover design requires 2.5 group delay ratio. Therefore, a new design is required to achieve the required group delay ratio and subsequently a stable phase shift over the entire BW.…”