Title :
An iterative synthesis scheme for wideband filter based on parallel-coupled three-line
Author :
Chen, Chia-Pang ; Oda, J. ; Kamata, Katsuhiro ; Imashiro, W. ; Anada, Takahisa ; Takeda, Shigeki
Author_Institution :
Dept. of Electr., Kanagawa Univ., Yokohama, Japan
Abstract :
An improved equivalent circuit for parallel-coupled three-line is derived by taking the cross-coupling between non-adjacent lines into consideration. Since the cross-coupling between non-adjacent lines is also dependent on that between adjacent lines, a novel successive iteration synthesis scheme is correspondingly proposed to synthesize the filter. As an example, a two-section three-line filter with a BW of 2.8-5.2GHz are synthesized, simulated and experimentally realized, respectively. The results obtained by our synthesis theory compare very well with those by simulation and experiment, while the model neglecting the cross-coupling between non-adjacent lines shows a 17% error in bandwidth estimation.
Keywords :
UHF filters; coupled transmission lines; equivalent circuits; iterative methods; bandwidth 2.8 GHz to 5.2 GHz; bandwidth estimation; cross-coupling; improved equivalent circuit; nonadjacent lines; parallel-coupled three-line; successive iteration synthesis scheme; synthesis theory; two-section three-line filter; wideband filter; Band-pass filters; Couplings; Equivalent circuits; Filtering theory; Microwave circuits; Microwave filters; Wideband; Wideband Filter; cross-coupling between non-adjacent lines; iteration; parallel-coupled three-line; synthesis;
Conference_Titel :
Microwave Conference (EuMC), 2013 European
Conference_Location :
Nuremberg
