Wave transmission lines and networks – Plural channel systems – Having branched circuits
Reexamination Certificate
2005-03-01
2005-03-01
Summons, Barbara (Department: 2817)
Wave transmission lines and networks
Plural channel systems
Having branched circuits
C333S193000
Reexamination Certificate
active
06861925
ABSTRACT:
A surface acoustic wave filter includes an antenna terminal, an antenna, a transmitting filter, a branching line and a receiving filter. The antenna is coupled to the antenna terminal. The transmitting filter is coupled to the antenna terminal. The transmitting filter receives an electrical power. The branching line is coupled to the antenna terminal. The branching line has a first length that is longer than λ/4 length so that the electrical power received by the transmitting filter when the antenna terminal is opened is smaller than when the antenna terminal is terminated, wherein λ is a wave length of a center frequency of transmitted and received bands of the surface acoustic wave filter. The receiving filter is coupled to the branching line.
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Ehara Hisanori
Komazaki Tomokazu
O-hashi Wataru
Oki Electric Industry Co. Ltd.
Summons Barbara
Volentine Francos & Whitt PLLC
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