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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°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°-phase shift bandwidth is more than 64.31%.

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