Learning Forum

[katherine.duncan]

Hello,

When I draw either a wire dipole or a planar strip dipole,  I receive the following message/note when I set the excitation for a lumped port - "multiple references conductors touching a port must all be connected in the plane of the port."  This error prohibits me from orientating the current on the port.   I have centered the strip between the two dipole arms in the plane and made sure the size of the excitation strip is the diameter of the wire and the length of the gap.

Is there a way to snap the individiual elements (2 dipole arms and the port) together so they are in the same plane and touch?

I appreciate any assistance/sugestions.

Regards.

[Praneeth]

Hi Katherine,

Please provide following information to help us serve you better.

1. Are you referring to the note on the reference conductor sub window while assigning the Lumped port in your post?
2. In the screenshot you have provided, it appears that the model is not set up correctly. If you are new to  antenna simulation then I would suggest you to use Antenna toolkit ACT extension which can create the simulation model of some standard antenna types (Diploe is included). This will guide you for better understanding on how to set up the model. Kindly go through this free video lesson on how to use the Ansys HFSS antenna toolkit - Microstrip Patch Antenna Creation Using Ansys HFSS Antenna Toolkit — Lesson 3 - ANSYS Innovation Courses. You can also go through other free Ansys Innovation Courses here - Electronics Engineering Courses | Ansys Innovation Courses.

Best regards,
Praneeth. 

[katherine.duncan]

Hi Praneeth,

Thank you for your response and the links to the educational materials.

Yes, I am referring to the sub-window.  I do not see any other errors in my model set-up.

To create my models, I opened the software, inserted the HFSS design tool, and drew my structure.  I have drawn the structure multiple ways to determine why I am receiving this error message.   I drew the structure as a wire – 1^st drawing a half wavelength wire and subtracting it from a small gap cylinder, a second method was to draw one arm and mirror it across the plane, and a third way was to create a planar half wavelength strip subtracting a small gap rectangle.  In these three different models, I created an air box approximately a half wavelength bigger than the antenna. I assigned a radiation boundary to the air box.  I next created a small rectangle, orienting it in the plane of the dipole between the two arms of the dipole.  The small rectangle was the same size as the gap and positioned in the center of the arms of the dipole.   I have checked this rectangle to verify that it is the same size as the gap and is centered and touching the arms of the dipole.  I assigned the lumped port excitation on this small rectangle. Instead of the lumped port general window popping up, I received the reference conductors for terminals window.

There is no way to assign an integration line to indicate the direction of the current.  I can click on the excitation under the project manage tab, and the lumped port window opens, but I cannot define the integration line. 

Next, I set up the analysis through the advanced solution set-up – I defined a single frequency and changed the maximum number of passes to 30. I did not edit the frequency sweep – I kept it at the default settings.  I inserted a far-field set-up as an infinite sphere – keeping the default values.

When I validate the model, I receive errors with the boundaries and excitations.  So, I am confident my issue is with the lumped port excitation.  My excitation is within the solution space, so I am sure this is the correct excitation.  The error states “Port “1”: the port has no terminals defined on it.” 

Again I appreciate any suggestions or feedback.

Regards.

[Praneeth]

Hi,

It looks like you are using a driven terminal solution type instead of a driven modal solution type. Please be advised that these two are different in nature. The integration line to define the current will be available in the driven modal type while reference conductors are used in the driven terminal type.

Kindly switch to the driven modal solution type if you like to use the integration line. For more information on these two different types please refer to Ansys HFSS help document.

Best regards,
Praneeth.

[katherine.duncan]

Hi Praneeth,

 

Thank you, that was the trick!