I C Hunter,J D Rhodes.Electronically tunable microwave bandpass filters[J].IEEE Trans Microw Theory Tech,1982,30(9):1354-1360.
[2]
Byung-Wook Kim,Sang-Won Yun.Varactor-tuned combline bandpass filter using step-impedance microstrip lines[J].IEEE Trans Microw Theory Tech,2004,52(4):1279-1283.
[3]
Mohammed A EI-Tanani,Gabriel M Rebeiz.Corrugated microstrip coupled lines for constant absolute bandwidth tunable filters[J].IEEE Trans Microw Theory Tech,2010,58(4):956-963.
[4]
Yi-Chyun Chiou,G M Rebeiz.A quasi elliptic function 1.75-2.25GHz 3-pole bandpass filter with bandwidth control[J].IEEE Trans Microw Theory Tech,2012,60(2):244-249.
[5]
M Sanchez-Renedo,R Gomez-Garcia,J I Alonso,C Briso-Rodriguez.Tunable combline filter with continuous control of center frequency and bandwidth[J].IEEE Trans Microw Theory Tech,2005,53(1):191-199.
[6]
Andrew C Guyette.Intrinsically switched varactor- tuned filters and filter banks[J].IEEE Trans Microw Theory Tech,2012,60(4):1044-1056.
[7]
G L Matthaei,L Young,E M T Jones.Microwave Filters Impedance-Matching Networks,and Coupling Structures[M].Norwood,MA:Artech House,1980.
[8]
Yuan Chun Li,Xiu Yin Zhang,Quan Xue.Bandpass filter using discriminating coupling for extended out-of-band suppression[J].IEEE Microw Wireless Compon Lett,2010,20(7):369-371.
