Question regarding Gain & Radiation Efficiency?

- September 18, 2023 at 7:57 am
  
  imtiaz
  Subscriber
  
  Hello, Good day. I have a question about gain and radiation efficiency in the interest of frequency region. According to S11, my interest in frequency bands ranges from 3.24 GHz to 8.74 GHz. However, if you look at the gain vs frequency graph, it drops after 3.24 GHz and then rises. The same thing happened in the radiation efficiency graph.
  I'm not sure why this is happening; do you have any ideas about the graph's behavior?
  Many thanks for considering my request.
- September 18, 2023 at 2:29 pm
  
  GioF
  Ansys Employee
  
  Hi imtiaz,
  It is expected for the results of Radiation efficiency and Gain to have this behavior.
  The Radiation Efficiency and Gain are calculated using the Accepted Power. Accepted Power is calculated using the s11 parameter.
  Please have a look at the following links of AEDT Help,
  Ansys HFSS 2023 R2 - Accepted Power
  Ansys Electronics 2023 R2 - Radiation Efficiency
  Ansys HFSS 2023 R2 - Peak Gain