half1st
Junior Member level 1
hye..currently i am working on branchline coupler design for ka-band frequency range. for simulation, i am using ADS. how i want to know whether the coupler has a good LO/RF isolation or not? i have a s-parameter result of the coupler. which of the parameters (S11, S21, S31 and S41) should i compared to know my coupler has good isolation?