Coupled Composite Right/Left-Handed Leaky-Wave Transmission Lines Based on Common/Differential-Mode Analysis

A systematic analysis for two types of symmetrical coupled composite right/left-handed (CRLH) leaky-wave (LW) transmission lines (TL) based on the common/differential-mode excitations is presented. The first proposed coupled CRLH LW-TL is a 4-port via-free coupled CRLH LW-TL that behaves as a conven...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2010-12, Vol.58 (12), p.3645-3656
Main Authors: Hashemi, M R M, Itoh, T
Format: Article
Language:English
Subjects:
Applied sciences
Capacitors
Circuit properties
Common/differential-mode
composite right/left-handed (CRLH) transmission line
Dispersion
dual polarization
Electric, optical and optoelectronic circuits
Electronics
Equivalent circuits
Exact sciences and technology
Excitation
Grounds
Impedance
Inductors
Integrated circuit modeling
leaky wave (LW)
Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits
Microwaves
Planes
Polarization
Power transmission lines
Studies
Symmetry
Transmission lines
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Summary:A systematic analysis for two types of symmetrical coupled composite right/left-handed (CRLH) leaky-wave (LW) transmission lines (TL) based on the common/differential-mode excitations is presented. The first proposed coupled CRLH LW-TL is a 4-port via-free coupled CRLH LW-TL that behaves as a conventional CRLH LW-TL under differential-mode excitation. But when common-mode excitation is applied, the structure has the ability to suppress the left-handed waves by operating in the cutoff mode, and only supporting right-handed guided as well as radiating waves. The second type of the proposed coupled CRLH LW-TL is a modification of the first type by inserting vias at the center of the left-handed stub of each unit-cell along the symmetry plane to provide a physical short-circuit to the ground. This structure behaves as a conventional CRLH LW-TL under both common- and differential-mode excitations but with orthogonal polarizations when operating in the fast-wave region. As a result, a dual polarized CRLH LW-TL is obtained.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2010.2086371