band pass cavity tune

i need document or paper to tune and adjust a band pass cavity used on antenna combiner arround 450mhz

I'have not docs about.
but if you have a cilindrical cavity, in few words:
1) Tune the Fo: Shortener heigh will increase frequency.

2) shortener (or place nearer to the wall) the lauchers (the loop wires) will increase the Q (will reduce the bandwidth).

thanks it is cylindric cavity ,i need a methode with generator spectre analyser etc dummy load 50ohm like this