Wideband Sharp-Rejection Signal Interference Bandstop Filter Using Branch-Line Coupler

Author

Velidi, Vamsi Krishna ; Rath, Subhalaxmi ; Sanyal, Subrata

Author_Institution

Dept. of Electron. & Electr. Commun. Eng., Indian Inst. of Technol. Kharagpur, Kharagpur, India

fYear

2011

fDate

24-25 Feb. 2011

Firstpage

1

Lastpage

4

Abstract

A novel design of micostrip bandstop filter (BSF) based on branch-line coupler structure is presented. The present BSF is obtained by modifying the branch-line coupler with open-circuits at the coupled and isolated ports. The usefulness of the present topology is demonstrated by comparing the filter performances with a standard two transmission line (TTL) signal interference BSF of same total electrical length. The proposed structure does not increase the physical dimension of the BSF, but improves the performance significantly. For given impedance ratio, the transmission zero separation bandwidth of the proposed BSF is always larger than the TTL-BSF. Measured prototype at 1.0 GHz validates the design approach.

Keywords

band-stop filters; broadband networks; interference (signal); microstrip filters; waveguide couplers; bandstop filter; branch-line coupler; frequency 1.0 GHz; impedance ratio; open-circuits; signal interference; two transmission line; wideband sharp-rejection; Band pass filters; Bandwidth; Couplers; Filtering theory; Impedance; Interference; Microwave filters;

fLanguage

English

Publisher

ieee

Conference_Titel

Devices and Communications (ICDeCom), 2011 International Conference on

Conference_Location

Mesra

Print_ISBN

978-1-4244-9189-6

Type

conf

DOI

10.1109/ICDECOM.2011.5738520

Filename

5738520