HF+6M lowpass and 4M highpass
Higpass Ltspice analysis setup:
Highpass frequency analysis ( insertion loss, insertion phase, and return loss):
Highpass Z-in and Z out analysis:
Lowpass LTspice analysis setup:
Lowpass filter frequency analysis ( insertion loss, insertion phase, and return loss):
Lowpass filter Z-in and Z out:
Inductors:
https://github.com/Supermagnum/diplexer/blob/main/Inductors.pdf