Title :
A miniaturized double-surface CPW bandpass filter improved spurious responses
Author :
Tsujiguchi, Tatsuya ; Matsumoto, Haruo ; Nishikawa, Toshio
Author_Institution :
Kanazawa Murata Manuf. Co. Ltd., Ishikawa, Japan
fDate :
5/1/2001 12:00:00 AM
Abstract :
A novel miniaturized double-surface coplanar waveguide (CPW) filter has been developed. The filter is constructed by an electrode pattern of half-wavelength resonators on a double-sided circuit board with a high dielectric constant. A miniaturized pattern can be obtained by optimization of the electrode layout without any deterioration in unloaded Q. We use a particular pattern of via holes to reduce spurious responses. The filter is 38% smaller in size than the conventional λ/4 CPW filter. Spurious responses up to the third harmonic are suppressed by 13 dB, and satisfy the performance level required for industrial-scientific-medical band equipment. The measurement results agree well with the results of simulation
Keywords :
band-pass filters; coplanar waveguide components; waveguide filters; ISM band; Q-factor; dielectric constant; double-sided circuit board; electrode pattern; half-wavelength resonator; harmonic suppression; layout optimization; miniaturized double-surface CPW bandpass filter; spurious response; via hole; Band pass filters; Conductors; Coplanar waveguides; Dielectric substrates; Electrodes; Electromagnetic waveguides; Finite element methods; High-K gate dielectrics; Microwave filters; Resonator filters;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
