Wave transmission lines and networks – Plural channel systems – Having branched circuits
Reexamination Certificate
2008-05-16
2011-12-06
Takaoka, Dean (Department: 2817)
Wave transmission lines and networks
Plural channel systems
Having branched circuits
C333S109000, C333S120000
Reexamination Certificate
active
08072289
ABSTRACT:
High-frequency couplers and coupling techniques are described utilizing artificial composite right/left-handed transmission line (CRLH-TL). Three specific forms of couplers are described; (1) a coupled-line backward coupler is described with arbitrary tight/loose coupling and broad bandwidth; (2) a compact enhanced-bandwidth hybrid ring coupler is described with increased bandwidth and decreased size; and (3) a dual-band branch-line coupler that is not limited to a harmonic relation between the bands. These variations are preferably implemented in a microstrip fabrication process and may use lumped-element components. The couplers and coupling techniques are directed at increasing the utility while decreasing the size of high-frequency couplers, and are suitable for use with separate coupler or couplers integrated within integrated devices.
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Caloz Christophe
Itoh Tatsuo
Lin I-Hsiang
Okabe Hiroshi
O'Banion John P.
Takaoka Dean
The Regents of the University of California
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