RFC Choke Question

Hello all,

I have a question related to RF Choke. I have gone through the thread https://www.edaboard.com/thread147856.html. But contrary, when I place a choke between the diode and the dc bias, it alters the results. The circuit works well if the inductance is low when it is high it alters the results. Why that?

Choke should be as high as possible and for DC act like a wire isn't it?

CAn anybody figure out the reason why.

Well it mite help to know what freq you are working at ? then a suitable value and design of RFC could be suggested :)

Dave

I am working at 5.25 - 10.5GHz.

OK then a RFC for that freq range is likely to consist of a "U" shape printed track on a PCB approx dimensions of ~ 6mm sqr going by the ones on my 5.8 and 10 GHz transceiver gear I work with. Am sure one of the design programs could give more precise measurements taking into account PCB type etc....
What I'm getting at is at those freq's... it IS NOT going to be a wire coil wound on a former or even a purely couple of turn airspaced one or even some sort of SMD inductor :)

cheers Dave

Could you please give any reference material/ links to know more about this stuff?