Wideband filtering phase shifters using vertically installed planar structure

In this letter, A wideband filtering phase shifter is proposed based on vertically installed planar (VIP) circuit structures, where the VIP circuit is used to realize a tight coupling. The even-odd mode analysis is adopted to analyze the whole structure. Then, a 45 degrees filtering phase shifter is designed to verify the validity of the design methodology. The simulated and measured results demonstrate that the proposed phase shifter has low insertion losses (<0.5 dB) and excellent return losses (<-15 dB). The 3 degrees-phase shift bandwidth is more than 64.31%.