Radio having a MEMS preselect filter

Telecommunications – Carrier wave repeater or relay system – With frequency conversion

Reexamination Certificate

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Details

C455S118000, C455S307000, C455S339000, C375S350000

Reexamination Certificate

active

07668505

ABSTRACT:
The present invention provides systems and methods for pre-filter in a VHF receiver using Micro-Electro-Mechanical Systems (MEMS) filters. The system includes an antenna, and first and second Micro-Electro-Mechanical Systems (MEMS) filters. The first MEMS filter filters a signal received by the antenna based on a first pre-defined bandwidth, and the second MEMS filter filters the signal filtered by the first MEMS filter based on a second bandwidth. The system also includes an analog to digital converter that converts the signal filtered by the second MEMS filter into a digital signal, a down converter that down converts the digital signal produced by the A to D converter, and a digital signal processor that processes the down converted digital signal produced by the down converter. The first and second MEMS filters or the down converter are adjustable based on a received tuning signal.

REFERENCES:
patent: 6680600 (2004-01-01), Emori et al.
patent: 6680660 (2004-01-01), Nguyen
patent: 7187735 (2007-03-01), Kent et al.
patent: 2003/0027534 (2003-02-01), Swazey
patent: 2004/0092243 (2004-05-01), Hey-Shipton
patent: 2004/0131131 (2004-07-01), Peach et al.
Elliott R. Brown. RF-MEMS Switches for Reconfigurable Integrated Circuits, IEEE Transactions on Microwave Theory and Techniques, vol. 46, No. 11, Nov. 1, 1998, pp. 1868-1880.
Ratazzi E P Ed, Institute of electrical and Electronics Engineers, Microeletromechanical Devices for Multimode Communication Systems, IEEE 2000 National Aerospace and Electronics Conference., Dayton, OH, Oct. 10-12, 2000, vol. CONF. 51, pp. 346-353.

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