Compact bandpass filters based on dual-plane microstrip/coplanar-waveguide structure with quarter-wavelength resonators
Resource
IEEE Microwave and Wireless Components Letters 17 (3): 178-180
Journal
IEEE Microwave and Wireless Components Letters
Pages
178-180
Date Issued
2007
Date
2007
Author(s)
Kuo, Tsung-Nan
Lin, Shih-Cheng
Wang, Chi-Hsueh
Chen, Chun Hsiung
Abstract
Compact wideband bandpass filters are proposed based on the dual-metal-plane structure consisting of both microstrip and coplanar-waveguide (CPW) quarter-wavelength resonators. By combining the advantages of dual-plane microstrip/CPW structure and stepped-impedance resonators, strong couplings between resonators may be accomplished so that the fourth-order cross-coupled filter with compact size and wide bandwidth may be realized. To further improve the selectivity, the sixth-order cross-coupled filter composed of four microstrip and two CPW resonators is implemented. Specifically, the implemented filters have the merits of compact size, good insertion/return losses, wide fractional bandwidth, and better selectivity. Good agreement between simulated and measured responses of these filters is demonstrated. © 2007 IEEE.
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