Telecommunications – Carrier wave repeater or relay system – With frequency conversion
Reexamination Certificate
2004-09-10
2010-02-23
Pan, Yuwen (Department: 2618)
Telecommunications
Carrier wave repeater or relay system
With frequency conversion
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.
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Bayern Keith A.
Jafri Ijaz H.
Vacanti David C.
Akinyemi Ajibola
Fogg & Powers LLC
Honeywell International , Inc.
Pan Yuwen
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