[1] [1] EISENSTADT W R,STENGEL B,THOMPSON B M.Microwave differential circuit design using mixed-mode S-parameters［M］.Boston,MA:Artech Hourse,2006.

[2] [2] LIU H,LIU T,ZHANG Q,et al.Compact balanced bandpass filter design using asymmetric sir pairs and spoof surface plasmon polariton feeding structure［J］.IEEE Microwave and Wireless Components Letters,2018:1-3.

[3] [3] GMEZ-GARCA R,LOECHES-SNCHEZ R,PSYCHOGIOU D,et al.Multi-stub-loaded differential-mode planar multiband bandpass filters［J］.IEEE Transactions on Circuits and Systems II:Express Briefs,2018,65(3):271-275.

[5] [5] SANS M,SELGA J,VELEZ P,et al.Optimized wideband differential-mode bandpass filters with broad stopband and common-mode suppression based on multi-section stepped impedance resonators and interdigital capacitors［C］//［S.l.］:IEEE Mtt-s International Conference on Numerical Electromagnetic & Multiphysics Modeling & Optimization for RF IEEE,2017:10-12.

[6] [6] ZHANG X Y,WANG Y,LEE J C.A novel differential bandpass filter with ultra-wide band common-mode suppression［J］.Microwave and Optical Technology Letters,2019,61(8):1988-1992.

[7] [7] KHALED A，HONG J S.Wideband differential-mode bandpass filters with stopband and common-mode suppression［J］.IEEE Microwave and Wireless Components Letters,2020,30(3):233-236.

[8] [8] GAO X,CHE W,FENG W.High selectivity wideband balanced filter based on modified coupled lines structures［C］// ［S.l.］:Symposium on Millimeter-waves IEEE,2017:47-49.