hello, there is a cavity filled with dielectrics shown bellow,it was planned to resonate at 12.5GHz.
i want to couple it using an RF-proble(coax line) represented by a descrete port connected to a cylinder shown bellow.
I have very few parameters , probe length which controls the resonant frequency and inductance
probe width which controls the capacitance .
The only good resuld i got is when my rfproble radius is 0.01mm as shown bellow.
And still i got only S11=-5db at resonance.
is there a way i could have a probe diametre of 1mm and get a good couling to the coax probe?
when i put a 0.2mm diameter i get a smith chart as shown in the end backly open circuit .
is there a way for compensation of thicker coax probe to get the result as i got in 0.01 radius?
Thanks.