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

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

The number of modes can be set in the port definition window. If you like to see higher order mode excitations, you need to set the number of modes properly. For example, you need to set at least 2 modes if you like to see common and differential modes together.