Design of Full-360° Reflection-Type Phase Shifter Using Trans-Directional Coupler With Multi-Resonance Loads

Abstract

In this paper, a full-360 • reflection-type phase shifter (RTPS) using a trans-directional (TRD) coupler with multi-resonance loads is presented. It features the characteristics of wide bandwidth, small size, wide phase shifts with a compact structure and inherent DC blocking. Influences of the multi-resonance loads on the phase shifts and insertion losses of the RTPS are analyzed, and design procedures are given for guidance. For validation, a prototype is designed at 2 GHz. The overall size is 0.56λ g × 0.17λ g . Measured results show a bandwidth of 20% under the criterion of more than 10-dB return loss. Meanwhile, a relative phase variation of 425 • with a maximum insertion loss of 3.6 dB is achieved when the varactor capacitance is varied among 0.35 pF ∼ 3.2 pF.

A compact dual-band patch coupler design for modern wireless applications

“…Therefore, the directional coupler [1], being an important passive device, must be redesigned to meet these requirements. These passive devices are widely used in various applications such as phase shifters [2], mixers, power amplifiers and bridging of many microwave circuits [3]. There are three main topologies for hybrid couplers.…”