Title :
Compact Wideband CPW Bandpass Filters With Transmission Zeros Based on Stepped Impedance Resonators (SIR)
Author :
Durán-Sindreu, Miguel ; Bonache, Jordi ; Martín, Ferran
Author_Institution :
Dept. d´´Eng. Electron., Univ. Autonoma de Barcelona, Bellaterra, Spain
Abstract :
Compact wideband and highly selective bandpass filters (BPFs) implemented in coplanar waveguide technology are presented. The high frequency selectivity is achieved by the presence of shunt-connected stepped impedance resonators which introduce a transmission zero at both band edges. The circuit model of the filter as well as the design procedure to synthesize the required bandwidth, based on such model, is presented. An order-3 prototype BPF with 38% fractional bandwidth, central frequency fo = 6.3 GHz and 0.03 dB bandpass ripple is designed and fabricated as proof-of-concept demonstrator. The measured filter response is in good agreement with the model predictions. Filter dimensions are as small as 0.16λ0 × 0.29λ00 , λ0 being the free-space wavelength at the central filter frequency.
Keywords :
band-pass filters; coplanar waveguides; electric impedance; resonators; band edge; bandpass ripple; central filter frequency; coplanar waveguide technology; filter circuit model; filter response measurement; fractional bandwidth; free-space wavelength; frequency 6.3 GHz; high frequency selectivity; model prediction; order-3 prototype BPF; proof-of-concept demonstrator; shunt-connected stepped impedance resonator; transmission zero; wideband CPW bandpass filter; Band pass filters; Coplanar waveguides; Filtering theory; Impedance; Integrated circuit modeling; Microwave filters; Resonant frequency; Bandpass filters (BPFs); coplanar waveguide (CPW); stepped impedance resonators (SIR);
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2011.2170671
