Title :
Compact planar ultra-wide pass-band filters with source-load coupling and impedance stubs
Author :
Mokhtaari, Marjan ; Bornemann, Jens ; Amari, Smain
Author_Institution :
Victoria Univ., Victoria
Abstract :
New configurations of folded and compact planar ultra-wideband filters with source- load cross coupling and impedance stubs are presented. Stepped impedance resonators and coupled-line sections as inverter circuits form the basic filter structures. High-low impedance lines connect individual resonators. Effective techniques such as open-stub lines and source-load cross coupling are utilized in order to add return-loss poles in the pass-band and create transmission zeros in the lower/upper stop-band region. Several filters are designed with 3dB fractional bandwidths of 80 percent, computed insertion losses better than 1 dB and return losses larger than 10 dB. Rejection levels in the upper/lower stop-bands are better than 35 dB. The designs are verified by results obtained with commercial electromagnetic software packages.
Keywords :
band-pass filters; electric impedance; invertors; microstrip filters; resonator filters; compact planar ultra-wide pass-band filters; coupled-line sections; electromagnetic software packages; impedance stubs; inverter circuits; microstrip filters; source-load cross coupling; stepped impedance resonators; stop-band region; transmission zeros; Band pass filters; Bandwidth; Coupling circuits; Filtering theory; Impedance; Insertion loss; Inverters; Poles and zeros; Resonator filters; Ultra wideband technology; Filter design; microstrip filters; stepped impedance resonators; ultra-wideband filters;
Conference_Titel :
Microwave Conference, 2006. APMC 2006. Asia-Pacific
Conference_Location :
Yokohama
Print_ISBN :
978-4-902339-08-6
Electronic_ISBN :
978-4-902339-11-6
DOI :
10.1109/APMC.2006.4429398