Title :
Tunable notch characteristics in microstrip ultra-wideband filters
Author :
Mokhtaari, Marjan ; Bornemann, Jens
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Victoria, Victoria, BC, Canada
Abstract :
Tunable notch characteristics are introduced in microstrip ultra-wideband (UWB) filters. The UWB design concept is based on harmonic characteristics of a half-wavelength 50 ¿ transmission line (at the lowest resonance frequency), which is grounded on both sides. The notch performance is first created by additional capacitive-coupled open stubs. Subsequently, these stubs are replaced by a varactor and bypass capacitors which, in combination with the biasing transmission line, provide transmission zeros in the lower stopband. The basic filter layout exhibits flexibility and compactness. Three different commercial field solvers are used to verify the overall performances of the proposed filters and their tunable notch characteristics.
Keywords :
circuit layout; circuit tuning; microstrip filters; microwave filters; notch filters; transmission lines; ultra wideband technology; varactors; UWB design; bypass capacitors; capacitive-coupled open stubs; commercial field solvers; filter layout compactness; filter layout flexibility; harmonic characteristics; microstrip ultrawideband filters; resonance frequency; stopband; transmission line; tunable notch characteristics; varactor; Band pass filters; Frequency; Microstrip filters; Passband; Power harmonic filters; Resonance; Resonator filters; Transmission lines; Ultra wideband technology; Varactors; Microstrip filters; microstrip resonators; notch filters; ultra-wideband filters; varactors;
Conference_Titel :
Microwave Conference, 2009. APMC 2009. Asia Pacific
Conference_Location :
Singapore
Print_ISBN :
978-1-4244-2801-4
Electronic_ISBN :
978-1-4244-2802-1
DOI :
10.1109/APMC.2009.5384323
