Multiplex communications – Duplex – Transmit/receive interaction control
Reexamination Certificate
2007-05-08
2011-10-11
Vu, Huy (Department: 2461)
Multiplex communications
Duplex
Transmit/receive interaction control
C370S297000
Reexamination Certificate
active
08036148
ABSTRACT:
A high-frequency circuit for wireless communications selectively using a first frequency band and a second frequency band lower than the first frequency band, comprising an antenna terminal; first and second transmission terminals to which transmitting signals in the first and second frequency bands are input; first and second receiving terminals from which received signals in the first and second frequency bands are output; a diplexer circuit for branching a first-frequency-band-signal path and a second-frequency-band-signal path; a switch circuit for switching a path for a transmitting signal and a path for a received signal; a low-noise amplifier circuit disposed between the switch circuit and the second receiving terminal for amplifying a received signal in the second frequency band; and first and second filter circuits disposed between the antenna terminal and the low-noise amplifier circuit in this order from the antenna terminal, both filter circuits passing a received signal in the second frequency band but blocking a frequency band lower than the second frequency band, and the band blocked by the first filter circuit being lower than the band blocked by the second filter circuit.
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Fukamachi Keisuke
Hagiwara Kazuhiro
Kemmochi Shigeru
Chery Dady
Hitachi Metals Ltd.
Sughrue & Mion, PLLC
Vu Huy
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