A new Ka-band 180° hybrid coupler

Abstract

A new wide band 1800 hybrid coupler is proposed in microstrip line structure, which is easy to fabricate and suitable for microwave integrated circuits (MICs) and monolithic microwave integrated circuits (MMICs). The hybrid consists of a Wilkinson power splitter and a short circuit stub 1800 differential phase shifter. Due to the simplicity of structure, this circuit is easy to implement at very high frequency band. Based on the proposed configuration, a Ka-band (26.5 to 40 GHz) 1800 hybrid coupler is designed and implemented on RF/duroid 5880 dielectric material. The phase variation of ±5° and the amplitude difference of ±O.4 dB were measured from 26.5 GHz to 40 GHz. The experiment verified the theoretical results favorably.