two ports antennna's radiation pattern

i want to design a dual-frequency microstrip antenna use two ports.so i want to know,if i want to see it's radiation pattern at one frequency,what should i do with two ports?

if you want control the antenna from ports one bye one while assign a voltage source to one port, you should assign 50 ohms load to other port.

hi
simulators not differs between 1 or n port antenna and in experimental it occur as same as software and test effect of all port at same time

When observing fields, HFSS references the 'Edit Sources' menu to determine the users desired excitation of the model. To modify this, by scaling the magnitude or changing the phase, go to HFSS -> Fields -> Edit Sources. Here you can turn on and off antennas in your model, or likewise have two ports out of phase with one another, ie CP radiation.

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