作者: Fu-Chang Chen , Qing-Xin Chu
DOI: 10.1109/TMTT.2008.2008963
关键词:
摘要: A novel approach for designing tri-band bandpass filters with independently controllable center frequencies and improved stopband rejection characteristic is presented in this paper. The assembled resonator constructed by a stepped impedance common half-wavelength employed to obtain response. designed operate at the first third passbands other second passband. Two kinds of filter configurations cascaded pseudointerdigital formats are proposed. Based on lossless lumped-element equivalent circuit, it found that both structures can introduce transmission zeros between passbands. To verify proposed approach, two fabricated, measured results exhibit responses high selectivity.