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About waveguide port usage

Question asked by wangyiliu99 on Dec 20, 2011
Latest reply on Dec 22, 2011 by HSLEE
Hi, all,

in EMPro Waveguide Ports Editor,

(1)as for the Waveguide Port Definition, there are two options,
50 Ohm voltage source and 1 W modal power feed
according to the user manual, modal power feed is useful if modal
analysis of the structure needs to be carried.

(2)as for the Number of Modes, the number is editable.

My questions are
(a) for waveguide port definition, are there any rule-of-thumb on
the selection of source? Whether the 50 Ohm voltage or 1 W modal.
Can it be interpreted as, 1 W modal power feed would get all the
1 Watt fed into the structure through the port, no matter the connected
part is 50 Ohm or not; while 50 Ohm voltage source would have power
reflected if the connected part is not 50 Ohm.

(b) for the number of modes, how to determine the exact value.
Would it be based on the user's guess of the interested structure?
Would the simulation result vary greatly if the number of modes is set differently?

Thank you very much!

Yours,
Yiliu  

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