HFSS: Port on a microstrip without a ground plane.

- March 28, 2022 at 4:21 pm
  
  Hyperion
  Subscriber
  
  How might I implement a port on a microstrip that does not have a ground plane along the entire bottom surface of the substrate? I'm quite new to HFSS and don't know exactly what to use. I'm trying to get the field patterns and S parameters for an RFID antenna. It has two ports, and it's possible that one is meant to act as the ground point and the other as the active portion, so I have tried putting a lumped port across the two and a voltage source across the two as different options. Neither seems to work, but it may also be due to a lack of understanding of the needed integration lines (I seem to have a hard time finding what exactly they describe and how to set them up).
- March 30, 2022 at 11:48 am
  
  Anchal Singh
  Ansys Employee
  
  May I know how you provide a return path for the signal if there is no ground plane? You must have a ground plane in your design not necessarily at the bottom of the substrate but it may be there in the same plane where the active portion of your design lies.
  You may follow the course Ansys HFSS Port Types - ANSYS Innovation Courses to have a better understanding of ports types in Ansys HFSS.
  Hope this helps
  Thanks
  Anchal
- April 8, 2022 at 9:29 am
  
  Hyperion
  Subscriber
  
  Hello Anchal This antenna has two ports, one of which is a feed-in and the other end of the lumped port is on the other port. Thanks for referencing those courses - unfortunately I'm still having no luck.
  H
- April 8, 2022 at 9:29 am
  
  Hyperion
  Subscriber
  
  Hello AncSingh This antenna has two ports, one of which is a feed-in and the other end of the lumped port is on the other port. Thanks for referencing those courses - unfortunately the antenna simulation still does not match what is expected. Below is a simplified version of the antenna I'm trying to test.

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