Wave transmission lines and networks – Plural channel systems – Having branched circuits
Reexamination Certificate
2007-07-24
2007-07-24
Takaoka, Dean (Department: 2817)
Wave transmission lines and networks
Plural channel systems
Having branched circuits
C333S112000
Reexamination Certificate
active
11132125
ABSTRACT:
A microwave directional coupler includes a microstrip conductor formed on a dielectric substrate and forming a main transmission line having in and out ports that receive signals to be coupled. A substantially U-shaped microstrip conductor is formed over the dielectric substrate adjacent to the main transmission line and forms a secondary transmission line having a coupling section and coupler port. A load resistor is formed within the secondary transmission line, and the coupling section is less than a quarter wavelength of a center frequency.
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Allen Dyer Doppelt Milbrath & Gilchrist, P.A.
Takaoka Dean
Xytrans, Inc.
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