Four-port microwave networks with intrinsic broad-band suppression of common-mode signals

Author

Fathelbab, Wael M. ; Steer, Michael B.

Author_Institution

Dept. of Electr. & Comput. Eng., North Carolina State Univ., Raleigh, NC, USA

Volume

53

Issue

5

fYear

2005

fDate

5/1/2005 12:00:00 AM

Firstpage

1569

Lastpage

1575

Abstract

Two classes of four-port microwave networks are defined with discriminative even- and odd-mode transmission characteristics. Design of the networks is based on filter prototypes with predefined sets of transmission zeros and, consequently, a desired response can be synthesized. A configuration consisting of a pseudodifferential active circuit in cascade with either class results in a sub-system with high common-mode rejection ratio over a broad frequency range. A pseudodifferential circuit implementation demonstrated low common-mode gain over a 3:1 operating bandwidth ranging from 250 to 750 MHz.

Keywords

interference suppression; microwave circuits; multiport networks; poles and zeros; 250 to 750 MHz; common-mode signals; filter prototypes; four-port microwave networks; intrinsic broadband suppression; pseudodifferential active circuit; transmission characteristics; transmission zeros; Active circuits; Circuit synthesis; Coupling circuits; Filtering theory; Matched filters; Microwave filters; Network synthesis; Network topology; Prototypes; Signal synthesis; Common-mode signals; four-port networks; matching/filtering; pseudodifferential circuits; transmission zeros;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/TMTT.2005.847046

Filename

1427959