Wave transmission lines and networks – Plural channel systems – Having branched circuits
Reexamination Certificate
2006-04-25
2006-04-25
Summons, Barbara (Department: 2817)
Wave transmission lines and networks
Plural channel systems
Having branched circuits
C333S126000, C333S129000
Reexamination Certificate
active
07034635
ABSTRACT:
An antenna duplexer including: a transmission filter, a reception filter, phase-shift circuits of adjusting phase characteristics on a transmission side and a reception side; and a junction point of connecting an antenna, wherein (1) an absolute value θ1of a difference between a first phase at a predetermined frequency of a pass band of the first filter and a second phase at the predetermined frequency at the time when the reception filter side is viewed from the junction point and (2) an absolute value θ2of a difference between a third phase at a predetermined frequency of a pass band of the reception filter and a fourth phase at the predetermined frequency at the time when the transmission filter side is viewed from the junction point is included in a range of 100 degrees or more and 170 degrees or less.
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Nakamura Hiroyuki
Seki Shun-Ichi
Matsushita Electric - Industrial Co., Ltd.
Summons Barbara
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