Can anybody help me to design a blocking network for a DC bias network in an amplifier

i want a capacitor in parallel and an inductor in series
and i want the output of the blocking to be around -30dB
need help to determine the values of the inductors and capacitors
multi-stage network is preferred

thanks

 

the ampliofier is working at 2-4 GHz

 

The inductor will do the blocking - adding a cap in parallel to it will just make a path around the inductor and effectively remove it from the circuit. You might want to use the cap to shunt AC to ground on the power side of the inductor.

In the GHz range, picofarad caps and one turn inductors should do the trick.

 

I tried to put a capacitor to ground and a series inductor
but the problem is at the output of the amplifier everything is fine i get a -30dB over the frequency range but at the input its -30dB at certain freq.

I also tried to have a quarter wavelength TL instead of the inductor ... did not work at well

if u plz could help me with a blocking network with numbers
frequency range 2-4 GHz