Hallo,
thanks for your reply.
So, we try to completely reflect the RF power arising at the VDD port.
What S21 values are preferred, if Iperform S-Parameter S-Parameter Simulations
(50 Ohm at VDD and 50 Ohm at Supply_Output!!!) on shunt-C's from Murata
GRM188, GRM155, GRM033.
Many Cs in parallel with different Series Resonant Frequencies will produce frequency areas with very low impedance and spikes inbetween with significant transmission from VDD to supply_output.
Added after 1 hours 4 minutes:
@mfding:
Below, you see the rejection and transmission of a murata 0402 10pF capacitor GRM155.
Self Resonance @ 2GHz, nearly no rejection / high transmission up to 20GHz.