Wave transmission lines and networks – Plural channel systems – Having branched circuits
Reexamination Certificate
2006-08-01
2006-08-01
Takaoka, Dean (Department: 2817)
Wave transmission lines and networks
Plural channel systems
Having branched circuits
C333S117000, C333S101000
Reexamination Certificate
active
07084717
ABSTRACT:
In a quadrature hybrid circuit which has first and second two-port circuits11and12inserted between I/O ports P1and P2and between I/O ports P4and P3, respectively, and third and fourth two-port circuits inserted between I/O ports P1and P4and between I/O ports P2and P3, respectively, and which is configured so that under the condition that the I/O ports P1to P4are matched, a high-frequency signal fed via the I/O port P1is divided between the I/O ports P2and P3and the divided two signals are output 90° out of phase with each other but no signal is provided to the I/O ports P4, there are provided SPST switches7and8responsive to external control to control electromagnetic connections or coupling across a plane of symmetry5of the quadrature hybrid circuit passing through intermediate points of symmetry23and24of the third and fourth two-port circuits21and22.
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Tetsuo Hirota, et al., “Reduced-Size Branch-Line and Rat-Race Hybrids for Uniplanar MMIC's”, IEEE Transactions on Microwave Theory and Techniques, vol. 38, No. 3, Mar. 1990, pp. 270-275.
Fukuda Atsushi
Hirota Tetsuo
Okazaki Hiroshi
NTT DoCoMo Inc.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Takaoka Dean
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