Title :
A Tune-All Wideband Filter Based on Perturbed Ring-Resonators
Author :
Beukman, T.S. ; Geschke, Riana H.
Author_Institution :
Dept. of Electr. & Electron. Eng., Univ. of Stellenbosch, Stellenbosch, South Africa
Abstract :
A dual-mode resonator is presented for tunable wideband filters, which allows tunability in both the centre frequency and bandwidth. It is based on a new perturbation arrangement in a ring-resonator that is electronically tuned with varactor diodes. A filter is designed for a radio astronomy receiver application. It consists of 6 cascaded dual-mode resonators with a 49% bandwidth in the L-band. High selectivity and low insertion losses are achieved. The centre frequency is tunable by 9% and the bandwidth by 25.3%. This design is unique in that it achieves wide bandwidth, is realisable in microstrip and tunable in both the centre frequency and bandwidth.
Keywords :
microstrip filters; radioastronomy; resonator filters; varactors; cascaded dual-mode resonator; microstrip; perturbation arrangement; perturbed ring-resonator; radio astronomy receiver; tunable wideband filter; tune-all wideband filter; varactor diode; Capacitors; Microstrip; Passband; Resonant frequency; Tuning; Wideband; Bandwidth tunability; cascaded filter; dual-mode resonator; microstrip filter; perturbed ring-resonator; tunable wideband filter; tune-all filter; varactor diodes;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2013.2245643
