Title :
Parallel-Coupled Coplanar-Waveguide Bandpass Filter With Multiple Transmission Zeros
Author :
Wu, Chao-Huang ; Wang, Chi-Hsueh ; Lin, Yo-Shen ; Chen, Chun Hsiung
Author_Institution :
Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei
Abstract :
A compact parallel-coupled coplanar-waveguide bandpass filter with good selectivity and stopband response is proposed. By using the quarter-wavelength resonators in implementation, the filter size can be reduced and no spurious passband is observed at twice the center frequency (2f0). In addition, by suitably introducing the capacitive and inductive cross-coupling effects, four transmission zeros around the passband edges may be created for improving the filter selectivity. For design purpose, the equivalent-circuit models are also established. In this study, the compact fourth-order filter with multiple transmission zeros for improving the selectivity is implemented, and its stopband is extended up to 3.43f0 with a rejection better than -30dB
Keywords :
band-pass filters; coplanar waveguide components; poles and zeros; BPF; CPW; bandpass filter; coplanar waveguide; coupled lines; multiple transmission zeros; parallel coupling; Band pass filters; Chaotic communication; Coplanar waveguides; Coupling circuits; Fabrication; Filtering theory; Frequency; Microstrip filters; Passband; Resonator filters; Bandpass filter (BPF); coplanar waveguide (CPW); coupled lines;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2006.890334
