Design of Ultra-Wideband Reconfigurable Microwave Phase Shifter

An ultra-wideband microwave reconfigurable phase shifter is presented in this paper. Stub-loaded is introduced to control harmonic response freely thus forming an UWB branch-loaded phase shifter with multiple modes. As a proof of concept, a prototype phase shifter covering 6-18GHz is designed, fabricated, and measured. The measured results agree well with the simulated ones. The experimental results show that the designed phase shifter relative bandwidth reaches 100% with VSWR less than 2. Moreover, benefiting from multi-branch loading, the maximum phase deviation (
$PD_{max}$
) of the phase shifter in whole frequency band is less than 15°. The proposed phase shifter is a promising candidate for polarization reconfigurable applications of UWB phased array in the future.