simultaneous excitation in the resonant cavities

i have a resonant cavity fed with two ports. now i want to excite the two ports simultaneously and see the fields in the resonator cavity at the resonant frequency. whether can it be done in the CST MWS or HFSS. i will be thankful for your reply.

do you khow how i can design re simple rectangular cavity resonator in hfss?

Simultaneous excitation is definitely possible in CST. With HFSS I didn't worked, so i don't know about it.