Wideband antenna matching

[KaS]

Hi everybody,

I'm developping a wideband antenna using a monopole wich operates below resonance. I want to match this antenna to a 50 ohms matched filter. For the moment, i have tried placing an attenuator after the antenna, but the filter response is still modified.
Do you know other methods to achieve this wideband matching?

Thank you.

 

[kleinesmurf69]

Hello,

What is the bandwidth of your filter? This will determine the bandwidth of the matching network and it would be useful to know this to select a possible solution.

Best regards.

 

[KaS]

In fact my filter is supposed to re-shape the antenna frequency response. Therefore it's important not to modify its response for the whole system bandwith (800 - 2200 MHz). I must match my antenna in this band so that the filter sees 50 ohm at its input.

Thanks again

 

[zorro]

Hi KaS,

Take into account the Bode-Fano constraints, that limit the bandwidth over which you can get a given matching for a prescribed load.
Regards

Z