Learning Forum

[Meghjit Majumder]

For Microstrip Patch Antenna using Coaxial Fed, there are two types of solution types available i.e 

Driven Modal and Driven Terminal. Which type of terminal is used in which case?

[Praneeth]

Hi Meghjit,

The Modal solution option is preferred for multimode or higher mode analysis, whereas the Terminal solution option is used for single mode analysis. Note that each of these solution options can be used for your case for a TEM mode excitation from the coaxial feed in your patch antenna.

More information about these two options can be found in "HFSS Help" and "An Introduction to HFSS" documents accessible from the Help menu.

Best regards,
Praneeth.

[Sido V]

 

Hello Meghjit,

Driven Modal is used for calculating the mode-based S-parameters of passive, high-frequency structures such as microstrips, waveguides, and transmission lines which are “driven” by a source, and for computing incident plane wave scattering.
Now, Driven Terminal is used for calculating the terminal-based S-parameters of passive,
high-frequency structures with multi-conductor transmission line ports which are “driven” by a source. This solution type results in a terminal-based description in terms of voltages and currents. Some modal data is also available.
I suppose you want to visualize some Antenna Parameters. Both Driven Modal and Driven Terminal can yield such results. That being said, depending on the design’s needs you can use either.

You can always find this, and more, information in the Help documents. 
Hope this helps!