Wave transmission lines and networks – Plural channel systems – Having branched circuits
Reexamination Certificate
2006-05-02
2006-05-02
Pascal, Robert (Department: 2817)
Wave transmission lines and networks
Plural channel systems
Having branched circuits
C333S133000, C333S193000
Reexamination Certificate
active
07038557
ABSTRACT:
An antenna duplexer has an antenna terminal;a transmitting phase-shift circuit, one side of which is connected to the antenna terminal;a receiving phase-shift circuit, one side of which is connected to the antenna terminal;a transmitting filter connected to the other side of the transmitting phase-shift circuit and a transmitting terminal; anda receiving filter connected to the other side of the receiving phase-shift circuit and a receiving terminal;wherein the transmitting filter and/or the receiving filter is a composite filter, and the composite filter attains a characteristic having an attenuation pole at simultaneous transmission and reception time when transmission and reception are simultaneously performed, and controls respective impedances by the transmitting phase-shift circuit and the receiving phase-shift circuit to operate as a sharing unit and attains a characteristic where the attenuation pole is removed at non simultaneous transmission and reception time when transmission and reception are not performed simultaneously.
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Adachi Hisashi
Ishizaki Toshio
Itokawa Hiroyuki
Kosugi Hiroaki
Nakamura Hiroyuki
Glenn Kimberly
Pascal Robert
RatnerPrestia
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