[1] [1] PONCHAK G E.Coplanar stripline spurline stub resonators with even-mode suppression for bandpass and bandstop filters［C］//USA:IEEE Microwave and Wireless Components Letters,2018,28(12): 1098-1100.

[2] [2] LIANG G Z,CHEN F C.A compact dual-wideband bandpass filter based on open-/short-circuited stubs［J］.IEEE Access,2020,8:20488-20492.

[3] [3] SAGHIR A,QUDDIOUS A,ARAIN S,et al.Single-/dual-BPF using coupled-line stepped impedance resonators(CLSIR)［J］.IEEE Transactions.Circuits Syst II,2019,66(9):1497-1501.

[4] [4] LIU H,WEN P,JIANG H,et al.Wideband and low-loss high-temperature superconducting bandpass filter based on metamaterial stepped-impedance resonator［J］.IEEE Transactions on Applied Superconductivity,2016,26(3): 1-4.

[5] [5] XU K D,LI D,LIU Y.High-selectivity wideband bandpass filter using simple coupled lines with multiple transmission poles and zeros［J］.IEEE Microwave and Wireless Components Letters,2019,29(2):107-109.

[6] [6] AWANG Z.Microwave systems design［M］.USA： Springer Singapore,2014.

[7] [7] POZAR D M.Microwave engineering［M］.USA: Publishing House of Elec,2004.

[8] [8] CHEN H,WANG X,LU G.A compact bandpass filter with multi-reflection zeros and sharp attenuations［C］// Fuzhou,China:2020 Cross Strait Radio Science & Wireless Technology Conference (CSRSWTC),2020: 1-3.

[9] [9] LOVATO R,GONG X.A low-loss continuously tunable phase shifter based on a bandpass filter with reconfigurable transmission zeros［C］// Boston，USA: 2019 IEEE/MTT-S International Microwave Symposium-IMS 2019， IEEE,2019.

[10] [10] ASTUTI D W,MUSLIM M,PUTRA R R.Substrate integrated waveguide bandpass filter using complementary split ring resonator for short range device applications［C］//Yogyakarta,Indonesia:2019 5th International Conference on Science and Technology (ICST),2019:1-4.

[11] [11] SEN D,PACKIARAJ D.Analysis and design of frequency reconfigurable stepped impedance resonator band pass filter［C］//Ahmedabad:2017 IEEE MTT-S International Microwave and RF Conference (IMaRC),2017:1-4.

[12] [12] WANG Y,JING X,YANG H.A new type of microstrip band-stop filter using spurline［C］// Changsha,China: 2015 16th International Conference on Electronic Packaging Technology (ICEPT),2015:1429-1432.

[13] [13] LI K,WANG W,LEI Z,et al.Microstrip bandstop filter using open stub and spurline［C］// Beijing,China:2011 IEEE International Conference on Microwave Technology & Computational Electromagnetics,2011:233-236.

[14] [14] HARIKRISHNA J V S.Compact spiral folded spurline for low-frequency applications［J］.Electronics Letters,2011,47(15):861-862.

[15] [15] ALRWUILI H G,KALKUR T S.A novel tunable dual-band bandstop filter (DBBSF) using spurlines with a stepped impedance resonator［C］// St Petersburg,Russia: Progress In Electromagnetics Research Symposium-Spring (PIERS),2017: 2245-2252.

[17] [17] HONG J S,LANCASTER M J.Microstrip filters for RF/microwave applications［M］.New York:Wiley,2002：62-65.