> Motor vehicle police radar detector.
> Covers lots of bands (X,K, Ka) and is already interfaced to a PIC.
> 
> You'll have to be a LOT more specific about what frequency of 
> microwaves you want to detect. The wavelength affects how big 
> the sensor has to be.

I am planning on using it as a proximity sensor similar to the 
microwave field sensors found in car alarms used in convertibles.
Is this called a doppler effect sensor? 

It should be small 3"x3" tops, and be able to sense up to a 360 deg
field around it.. up to maybe 8 or 9 ft. 

Any ideas? I guess using a car alarm sensor would work but they 
are kinda pricy. There must be a cheaper way to get one out there 
or a schematic I could build from scratch. 

Thanks, 
Mike

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