Dual band tuning

Details Dual band tuning Dual band tuning

2005-03-01

2005-03-01

Hudspeth, David (Department: 2681)

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

C455S192300, C455S182300, C331S17700V, C331S179000

Reexamination Certificate

active

06862437

ABSTRACT:
A dual band RF tuning circuit (1) has a first impedance element (4) and a second impedance element (5) between an RF input port (2) and an RF output port (3), tuning being provided by the impedance elements (4, 5) to a first RF signal, and a switching transistor (9) connected to the second impedance element (5) to open circuit the second impedance element (5) for tuning to a second RF signal by the first impedance element (4) alone.

REFERENCES:
patent: 3624514 (1971-11-01), Putzer
patent: 4023106 (1977-05-01), Utsunomiya
patent: 4326295 (1982-04-01), Matsumoto et al.
patent: 4905306 (1990-02-01), Anderson
patent: 5808879 (1998-09-01), Liu et al.
patent: 5995814 (1999-11-01), Yeh
patent: 6134452 (2000-10-01), Hufford et al.
patent: 6311050 (2001-10-01), Welland et al.

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