Converting decoupling capacitors in RF amplifiers to microstrip length and width

Is there anyway decoupling capacitors in RF amplifier circuits can be converted to microstrip length and width?

At high frequencies you can use radial stubs.
http://www.microwaves101.com/encyclo...wave.cfm#stubs

i read the notes but i am not sure how to implement the radial stubs in my design as the decoupling capacitor?

i am doing 12GHz LNA. i need the the decoupling capacitor( or radial stubs) for my DC vgs source and VDD source.

A radial Stub is a Capacitor basically that u can put after an λ/4 line. What u want is no signal at 12GHz to go through your DC path and fed back at the input. A high impedance λ/4 with a radial stub at the top will do the work. is working like a bias tee L-C network. Simulated and u will see is simple.

In general, you do not want to do that. That amplifier at 10 GHz that has 12 dB of gain, also probably has 40 dB of gain at 2 MHz. If you do not have some big decoupling caps that have low reactance at the lower frequency, it is easy to turn the amp into an oscillator.

i implemented the radial stubs to replace the decoupling capacitor in my 12GHz microstrip LNA design but i m not sure about the calculation involved in getting the angle and width of the radial stubs(i used λ/4 as the length).

I hope someone can guide me on this aspect.thanks

Download Simons book and go to page 318
https://www.edaboard.com/viewtopic.php?t=35081