Learning Forum

[parksb2002]

Hi,

 

I'm trying to simulate RF harvesting circuit with Ansys HFSS.

What I want to know is how to calculate the received energy of antenna with non-port excitation sources(plane wave, spherical wave, near field data, far field data). If I have clear transmitting source driven by wave, lumped port, then I can easily calculate the S21 for two ports. However, my excitation is actually near field data computed by other numerical tools. 

I set the port of antenna as lumped port. Edit sources->0W on the port.

So my questions are

1. How to calculate the received power on antenna from incident wave excitation. (Sum of poynting vector, surface current, etc)
2. Can I get the more detailed waveform or voltage/current from antenna port. If can, How?

I'm sorry for repeated question that others already posted. But lack of my understanding, I need more clear answer about it:(

Thank you.

[Faezeh Ladani]

Hi Park, 

You can calculate the current flowing on the antenna port as well as the induced voltage across the port using fields calculator. Online help has examples which explicitly show how to calculate these quantities. Search for "Calculating the Current along a Wire or Trace" and "Calculating the Voltage Drop along a Line". Note that if you have several incident sources, super position applies to fields, but not power, so you need to have all the sources on for total field when you calculate the power. 

 

[parksb2002]

Thank you for your reply!

But I have a question about the last part of your answer, what does it mean "all the sources on for total field"?

[Савоненко Артем]

 

 

 

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[marketing]

Simulating RF harvesting circuits in Ansys HFSS with non-port excitation sources like plane waves or near field data can be challenging. To calculate the received power on the antenna from incident wave excitation, you can indeed use the Poynting vector method. Integrating the Poynting vector over the surface area of the antenna will give you the total power received. Alternatively, using surface currents and the antenna impedance can also help you calculate the power.

As for obtaining a more detailed waveform or voltage/current from the antenna port, you can set up field probes or use HFSS's post-processing tools to extract these details. This will allow you to visualize and analyze the voltage and current distributions directly. It's similar to how healthcare technology developers analyze data and signals in medical devices to ensure precision and effectiveness. Using the right analysis methods and tools is crucial for accurate simulation and optimization

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To calculate received power excited by non-port excitations, you’ll need to break down the electromagnetic fields and apply the right boundary conditions. It’s often tricky when you don’t have direct port access, but integrating over the surface of interest can help. If you need detailed guidance or help with these kinds of calculations, sometimes it’s easier to consult experts. Services like this one academicghostwriter.org can provide support with complex technical writing or research. Keep in mind that accuracy in defining excitation sources and analyzing the results is key when working with non-standard setups.

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