Title :
A dual-mode bandpass filter with enhanced capacitive perturbation
Author :
Tan, Boon Tiong ; Chew, Siou Teck ; Leong, Mook Seng ; Ooi, Ban Leong
Author_Institution :
DSO Nat. Labs., Singapore
Abstract :
A dual-mode ring bandpass filter with two pairs of capacitors has been designed. The capacitors are used to control the location of the even- and odd-mode frequencies independently, allowing weak coupling for narrow-band filter design with realizable capacitance values. Theoretical expressions have been derived for these frequencies. A 4% bandwidth bandpass filter centered at 1.9 GHz was designed and tested with good agreement between theoretical and measured results.
Keywords :
Q-factor; UHF filters; band-pass filters; equivalent circuits; passive filters; resonator filters; 1.9 GHz; capacitor pairs; dual-mode bandpass filter; even-mode frequencies; narrow-band filter design; odd-mode frequencies; ring bandpass filter; Band pass filters; Capacitance; Capacitors; Dielectric measurements; Frequency; Microstrip resonators; Narrowband; Optical ring resonators; Resonance; Resonator filters;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2003.815264
