Resonant cavity combiners/dividers

Hi, do somebody have any material about how to design a resonant cavity combiner? I need to do it but everythig I find is related with the wilkinson's planar designs. I need it for a 476 MHz, spatial and quasi-optical combiner look not to be a good choice. Any hint about all this is well come!
I'm trying to simulate something at HFSS, if some have something to help me, please do it!

Thaks in advance!

Thadeu