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Antenna with different receive and transmit impedance

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cadour

Computer
Jul 12, 2011
3
Hello,

generally, by design, the receive and transmit loads of an antenna would be the same. Is there a way to have differing loads in transmit and receive modes?

I.e. I want an antenna to be highly reflective to incoming signals but be ideally parametrised when transmitting.

Thanks for any suggestions or help

Cadour
 
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Trying to understand antennas in stealth airplanes where I would think you would want the antenna to reflect as little as possible (the opposite of my question )
 
Hmmm...

In answer to the original question, you'd probably use a simple T/R switch at the feedpoint. When transmitting, the transmitter would be connected straight through. When not transmitting, the "receive" path would be a refective short.

There may be other techniques that could be used such as circulators or quarter-wave directional couplers.

What these all have in common is that the action happens in the feed line, not the antenna as such.
 
Thanks VE1BLL and IRstuff for your help.
Interesting that Plasma antenna- what a brilliant idea (litteraly).
 
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