Title :
New parallel /spl lambda//2-microstrip line filters with transmission zeros at finite frequencies
Author :
Amari, S. ; Tadeson, G. ; Cihlar, J. ; Rosenberg, U.
Author_Institution :
Dept. of Electr. & Comput. Eng., Mil. Coll. of Canada, Kingston, Ont., Canada
Abstract :
The paper presents a new class of /spl lambda//2-microstrip line filters with transmission zeros at finite frequencies. The filters take advantage of the difference between the propagation constants of the even and odd modes of two symmetric coupled microstrip lines to generate the transmission zeros in addition to the reflection zeros of the passband. A simple model is used to show that the transmission zeros are not due to cross-coupling of nonadjacent resonators but rather to internal anti-resonances in the structure. The results obtained from a full-wave solution using a commercial software package are in good agreement with those of the model. Examples of filters with transmission zeros in the lower or upper stop-bands are presented.
Keywords :
UHF filters; band-pass filters; elliptic filters; microstrip filters; microstrip resonators; microwave filters; passive filters; poles and zeros; resonator filters; elliptic function filters; even modes; finite frequencies; internal anti-resonances; model; odd modes; parallel /spl lambda//2-microstrip line filters; propagation constants; pseudo-elliptic filters; reflection zeros; symmetric coupled microstrip lines; transmission zeros; Couplings; Filtering theory; Frequency; Magnetic separation; Microstrip filters; Passband; Propagation constant; Resonator filters; Software packages; Superconducting filters;
Conference_Titel :
Microwave Symposium Digest, 2003 IEEE MTT-S International
Print_ISBN :
0-7803-7695-1
DOI :
10.1109/MWSYM.2003.1210996
