Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
October 24, 2006
Patent Application Number
10649829
Date Filed
August 28, 2003
Patent Primary Examiner
Patent abstract
A frequency conversion apparatus has a high-frequency amplifier for amplifying an input high-frequency signal, a mixer for mixing the output signal of the high-frequency amplifier with a local oscillation signal, a filter for restricting the band of the output signal of the mixer to permit passage of only components within a predetermined band, and a variable filter provided between the high-frequency amplifier and the mixer and having a controllable cut-off frequency. With this configuration, it is possible to reduce back talk at low cost without inviting variation of input return loss characteristics.
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