Hi everyone! I tried to research what kind of triplexer designs are currently used by others. However, I was unable to find much useful information. I am working on my own design and naturally try to avoid possible mistakes that others may already have made before me.
Here's my first prototype PCB. It uses a Mini Circuits 50 to 75 Ohm transformer for proper impedance match. Simple T networks with corner frequencies of around 30 MHz and 120 MHz provide Ref-Clock and IF isolation. After transforming to 75 Ohms system impedance, the DC voltage is injected trhough a RFC.
Here's a better design I implemented in DipTrace that I might send off to a PCB manufacturer for initial tests. The IF traces are kept a lot shorter in comparison to the REF IN traces. Can't wait to check its performance on a VNA.
And this is the schematic of revision 0.1: