Microstrip port for Patch

Abhishek K M

I am trying to do Characteristic Mode Analysis (CMA) in FEKO and plotting Modal Excitation Coefficients. Hence I need to provide excitation using port. Since I want to use only the patch and NOT  ground plane and substrate, I am providing microstrip port to the feedline(patch.pnj).

But for some reason, the port excitation is not working, because I am getting this error (error.pnj). I have attached the .cfx herewith.

I am not sure what is wrong here, any help is appreciated!

Regards

Mel

You need a ground and substrate to use the microstrip port. And a port needs a source, such as a voltage source. The CMA plotter tool gives the error because there was no source.

An edge port can be used without dielectric but still it needs to be between two faces. For example, a strip dipole uses a balanced feed in the middle:

A wire port can also be used, but again, it feeds between two points. Below the wire version of the dipole.

You could use a plane wave which does not require a ground.

 

 

Abhishek K M

mel_21333 said:

You need a ground and substrate to use the microstrip port. And a port needs a source, such as a voltage source. The CMA plotter tool gives the error because there was no source.

An edge port can be used without dielectric but still it needs to be between two faces. For example, a strip dipole uses a balanced feed in the middle:

A wire port can also be used, but again, it feeds between two points. Below the wire version of the dipole.

You could use a plane wave which does not require a ground.

 

 

Thanks a lot, I hadn't added the voltage source. Now it is working.