switches for A/C signals- what component to use?

[Bob Stegmann]

I have an RFID reader circuit for which I wish to switch between two antenna
coils hooked in parallel to the same driver. I want to turn off the coil
driver, switch to a new coil (closing the connection to the first coil),
then turn the driver back on. I will loop this process to use one reader
circuit for two antennas. My question is what component can I use as
switches for the coils? Will FETs in series with the coils do the trick?
What type of FET would be best? My experience with these components is
limited, and I really don't understand all the component types/variations
that I see out there....if someone can point me in the right direction
that'd be great.

Thanks for any advice,
Bob.

 

[Watson A.Name - "Watt Sun]

In article <vp5c0gjhdou63b@corp.supernews.com>, lastname@eai.com
mentioned...

I have an RFID reader circuit for which I wish to switch between two antenna
coils hooked in parallel to the same driver. I want to turn off the coil
driver, switch to a new coil (closing the connection to the first coil),
then turn the driver back on. I will loop this process to use one reader
circuit for two antennas. My question is what component can I use as
switches for the coils? Will FETs in series with the coils do the trick?
What type of FET would be best? My experience with these components is
limited, and I really don't understand all the component types/variations
that I see out there....if someone can point me in the right direction
that'd be great.

PIN diodes are often used to switch RF signals. Depends on signal
levels, etc. One piece of equipment that has switched antennas is the
doppler radio direction finder that hams use to track hidden
transmitters. See http://members.aol.com/homingin/

Thanks for any advice,
Bob.

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