RF modulator and switch having high antenna isolation

Details RF modulator and switch having high antenna isolation RF modulator and switch having high antenna isolation

2005-06-21

2005-06-21

Tran, Pablo N. (Department: 2685)

Telecommunications

Receiver or analog modulated signal frequency converter

With wave collector

C455S082000, C455S083000, C455S133000, C455S266000, C333S103000, C333S104000

Reexamination Certificate

active

06909885

ABSTRACT:
An RF modulator/switch selectably couples a locally generated and conducted RF signal or an antenna RF signal to a broadcast radio receiver. A local RF input receives the conducted RF signal. An antenna RF input receives the antenna RF signal in response to a radiated RF broadcast in a broadcast band. A resonant network has a first node coupled to the antenna RF input and has a resonant frequency corresponding to the broadcast band. A first relay has a first output selectably coupled to either the antenna RF input or a second node of the resonant network. A second relay has a second output selectably coupled to either the local RF input or the first output of the first relay. When the second relay selects the local RF input then the first relay selects the second node of the resonant network and when the second relay selects the first output of the first relay then the first relay selects the antenna RF input.

REFERENCES:
patent: 5319716 (1994-06-01), McGreevy
patent: 5970390 (1999-10-01), Koga et al.
patent: 6535719 (2003-03-01), Suzuki et al.
patent: 6650199 (2003-11-01), Dobrovolny
patent: 6782239 (2004-08-01), Johnson et al.
patent: 6799028 (2004-09-01), Bauer
patent: 6810233 (2004-10-01), Patsiokas
patent: 2002/0058475 (2002-05-01), Patsiokas
patent: 2003/0071698 (2003-04-01), Dobrovolny

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