Title :
Compact Bandpass Filters Based on Dual-Plane Microstrip/Coplanar-Waveguide Structure With Quarter-Wavelength Resonators
Author :
Kuo, Tsung-Nan ; Lin, Shih-Cheng ; Wang, Chi-Hsueh ; Chen, Chun Hsiung
Author_Institution :
Dept. of Electr. Eng. & Graduate Inst. of Commun. Eng., Nat. Taiwan Univ., Taipei
fDate :
3/1/2007 12:00:00 AM
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
Keywords :
band-pass filters; coplanar waveguides; microstrip filters; resonator filters; compact bandpass filters; coplanar waveguide structure; cross coupling; dual-metal-plane structure; dual-plane microstrip structure; fourth-order cross-coupled filter; quarter-wavelength resonators; sixth-order cross-coupled filter; stepped-impedance resonators; wideband bandpass filters; Band pass filters; Bandwidth; Circuits; Coplanar waveguides; Insertion loss; Microstrip filters; Microstrip resonators; Q factor; Resonator filters; Wideband; Bandpass filter (BPF); coplanar waveguide (CPW); cross coupling; microstrip; quarter-wavelength stepped-impedance resonator;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2006.890460
