QUESTION:
Do you have an example demonstrating the procedure for modeling a single pole antenna located above an infinite conductor plane, but not touching the plane? I want to add a voltage excitation. I am interested in
- Close Field
- Far Field
- Antenna Impedance
- Total Current along the antenna
My questions are:
- Do I need to mesh the antenna as a volume or a line?
- If I have to volume mesh the antenna, do I need to use a 'skin' thickness, as I am interested in the current around the antenna, and not the internal current?
- How can I apply the voltage ( where do I apply the 2 values to create the difference of voltage)?
- How far do I need to mesh around the antenna?
- How can I use symmetries in the model?
- Which elements should I use on the boundaries?
ANSWER:
See the attached example (ANSYS input file) plots and animation.
In words, answers to questions are:
- I would model the antenna as a cylindrical void. The surface should be PEC.
- Apply voltage with a COAX port
- Extent of mesh neednot be much more than 0.5 times antenna length. Experiment with parameters using the input file to make sure.
- Model 90 degree sector with PMC (naturally occurring) at 0 and 90 degrees.
- For PML ('perfectly matched layers') surround the computational domain with elements having keyopt(4) set to 1.
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QUESTION: Do you have an example demonstrating the procedure for modeling a single pole antenna located above an infinite conductor plane, but not touching the plane? I want to add a voltage excitation. I am interested in - Close Field - Far Field - Antenna Impedance - Total Current along the antenna My questions are: - Do I need to mesh the antenna as a volume or a line? - If I have to volume mesh the antenna, do I need to use a `skin` thickness, as I am interested in the current around the antenna, and not the internal current? - How can I apply the voltage ( where do I apply the 2 values to create the difference of voltage)? - How far do I need to mesh around the antenna? - How can I use symmetries in the model? - Which elements should I use on the boundaries? ANSWER: See the attached example (ANSYS input file) plots and animation. In words, answers to questions are: - I would model the antenna as a cylindrical void. The surface should be PEC. - Apply voltage with a COAX port - Extent of mesh neednot be much more than 0.5 times antenna length. Experiment with parameters using the input file to make sure. - Model 90 degree sector with PMC (naturally occurring) at 0 and 90 degrees. - For PML (`perfectly matched layers`) surround the computational domain with elements having keyopt(4) set to 1. |
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