Biasing a diode transmission line

Hello,

I am trying to bias a diode by any approach but this does not work.
I have tried the approaches advised in https://www.edaboard.com/thread101503.html, my choke is a printed Square spiral but I can not see a change at the output. I am developing a doubler at 40 GHz. So with an increase in Dc bias I should see a small increase in Output power at 80 GHz which remains unaffected. I have even tried used a bias tee arrangement that is a very thin quarter wave length transmission line with a grounded capacitor.

What Am I doing wrong , can anyone please advice?

Thanks in advance.