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

Volume

1

fYear

2003

Firstpage

543

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Symposium Digest, 2003 IEEE MTT-S International

ISSN

0149-645X

Print_ISBN

0-7803-7695-1

Type

conf

DOI

10.1109/MWSYM.2003.1210996

Filename

1210996