Antenna damping circuit and high frequency receiver...

Details Antenna damping circuit and high frequency receiver... Antenna damping circuit and high frequency receiver...

2005-11-07

2010-12-07

Phu, Sanh D (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

C455S193200, C455S195100, C455S192200, C455S234100

Reexamination Certificate

active

07848721

ABSTRACT:
An antenna damping circuit in which the frequency characteristics of damping amount can be made substantially flat by providing a resistor (Ra) between PIN diodes (D1, D2) having a resistance varying upon application of a control voltage (Vc) and a capacitive dummy antenna circuit (10), and setting its resistance high enough to neglect the capacity of the dummy antenna circuit (10) sufficiently when the dummy antenna circuit (10) is viewed from the side of the PIN diodes (D1, D2) thereby substantially eliminating the influence of capacity of the dummy antenna circuit (10).

REFERENCES:
patent: 5196845 (1993-03-01), Myatt
patent: 6229797 (2001-05-01), Cho
patent: 2005/0237220 (2005-10-01), Nolan et al.
patent: 56130342 (1981-10-01), None
patent: 58158545 (1983-10-01), None
patent: 60260220 (1985-12-01), None
patent: 05009029 (1993-02-01), None
patent: 2002111524 (2002-04-01), None
patent: 2002171149 (2002-06-01), None

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