High-Performance Compact Reflection-Type Phase Shifter operating at 2 GHz Using a Transdirectional Coupler

In this paper, a compact and high-performance Reflection-Type Phase Shifter operating around 2 GHz is proposed. It is realized in standard PCB technology by using a very compact transdirectional coupler and simple tunable reflection loads. The circuit size is equal to 0.29 • 0.1$\lambda _g^2$. This small size is achieved without sacrificing performance; the figure of merit, given by the ratio of the maximum phase shift divided by the maximum insertion loss reaches 169°/dB at 2.15 GHz, which is comparable to the average performance published in the literature. The demonstrated small size paves the way for the realization of very compact RF feeding networks for phased arrays.