Title :
A Novel Millimeter-Wave Ultra-Wideband Bandpass Filter Using Microstrip Dual-Mode Ring Resonators Loaded with Open Tuning Stubs of Different Lengths
Author :
Ma, Zhewang ; Cai, Peng ; Guan, Xuehui ; Kobayashi, Yoshio ; Anada, Tetsuo
Author_Institution :
Saitama Univ., Saitama
Abstract :
In this paper, a millimeter-wave ultra-wideband (UWB) bandpass filter is developed by cascading two microstrip dual-mode ring resonators loaded with lambda0/4 and 3lambda0/4 open tuning stubs, respectively. The ring resonators are analyzed by using the even-and odd-mode method, and closed-form formulas are derived to facilitate the design of transmission zeros of these resonators. The filter has a midband frequency of 25.5 GHz and a 3-dB bandwidth of 5 GHz (20%). Due to the multiple transmission zeros produced in both the lower and upper stopbands, the filter exhibits sharp attenuations near the passband and very wide stopbands. Over 13-35 GHz, the Federal Communications Commissions indoor limit is satisfied quite well.
Keywords :
band-pass filters; circuit tuning; microstrip filters; microstrip resonators; millimetre wave filters; poles and zeros; resonator filters; UWB bandpass filter; bandwidth 5 GHz; closed-form formulas; even-mode method; microstrip dual-mode ring resonators; millimeter-wave filter; odd-mode method; open tuning stubs; transmission zeros; ultra-wideband bandpass filter; Band pass filters; Filtering theory; Frequency; Microstrip filters; Microstrip resonators; Millimeter wave technology; Optical ring resonators; Resonator filters; Tuning; Ultra wideband technology; Dual-mode ring resonator; bandpass filter; millimeter-wave; ultra-wideband;
Conference_Titel :
Microwave Symposium, 2007. IEEE/MTT-S International
Conference_Location :
Honolulu, HI
Print_ISBN :
1-4244-0688-9
Electronic_ISBN :
0149-645X
DOI :
10.1109/MWSYM.2007.380046
