John_li
Full Member level 5
Hi friends,
I am designing a 2.4GHz bandpass filter for approval.I try two solutions(in fact ,they are not too good for small PCB size),and get the results :modification#1 and modification#2.when i measured them alone as filter by VNA.It is obvious that modification#2 is better than modification#1 at 1.6GHz.But when i put the filter into system,i found i got the inverse result by spectrum analyzer.Any friend kindly help me find the root cause?
Thanks
I am designing a 2.4GHz bandpass filter for approval.I try two solutions(in fact ,they are not too good for small PCB size),and get the results :modification#1 and modification#2.when i measured them alone as filter by VNA.It is obvious that modification#2 is better than modification#1 at 1.6GHz.But when i put the filter into system,i found i got the inverse result by spectrum analyzer.Any friend kindly help me find the root cause?
Thanks