Title :
High performance direct coupled bandpass filters on coplanar waveguide
Author :
Everard, Jeremy K A ; Cheng, Kwok K M
Author_Institution :
Dept. of Electron., York Univ., UK
fDate :
9/1/1993 12:00:00 AM
Abstract :
This paper describes the design and performance of shunt inductively coupled bandpass filters implemented on an open coplanar waveguide. This new structure exhibits low radiation loss due to the removal of the capacitively coupled gaps encountered in end or edge coupled filters. Unloaded Qs greater than 540 have been achieved in unshielded single section resonators at 4 GHz on very thin substrates. These high Qs enable the design of filters with low insertion loss and good stopband rejection. Applications include low insertion loss, high and printed filters where no screening is required, low noise oscillators and superconducting filters
Keywords :
Q-factor; band-pass filters; linear network synthesis; microwave filters; waveguide components; 350 MHz; 4.6 GHz; CPW filter structure; direct coupled bandpass filters; immittance inverters; impedance transformers; low insertion loss; low noise oscillators; low radiation loss; open coplanar waveguide; printed filters; shunt inductively coupled bandpass filters; stopband rejection; superconducting filters; unloaded Q; unshielded single section resonators; Band pass filters; Conductors; Coplanar waveguides; Fabrication; Insertion loss; Microstrip; Resonance; Resonator filters; Shunt (electrical); Superconducting filters;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
