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

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 consi...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2005-05, Vol.53 (5), p.1569-1575
Main Authors: Fathelbab, W.M., Steer, M.B.
Format: Article
Language:English
Subjects:
Active circuits
Applied sciences
Bandwidth
Cascades
Circuit properties
Circuit synthesis
Circuits
Common-mode signals
Coupling circuits
Electric, optical and optoelectronic circuits
Electronics
Exact sciences and technology
Filtering theory
four-port networks
Frequency ranges
Gain
Matched filters
matching/filtering
Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits
Microwave filters
Microwaves
Network synthesis
Network topology
Networks
Prototypes
pseudodifferential circuits
Rejection
Signal synthesis
transmission zeros
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Description
Summary: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.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2005.847046