I'm simulating a receiving antenna with a plane wave excitation. In my structure, I have a resistor and capacitor in parallel (RLC parallel lumped element) to the port so I wanted to know is it always necessary to use a port in such simulations?
As I understand your question my answer is yes, it is always necessary to use a port in any antenna simulations, but ports can be different.
You don't need a port, you could model your antenna feed point as a lumped element load (but it might not be a very good model). But if it isn't a port then things that CST does automatically for ports won't happen. You need something to absorb the incoming wave, if you want to model the antenna receiving power as it will in reality. You could also model an absorbing material in the feed, to absorb the received power.
Hello,
If you aim to compute the amount of power that will be absorbed by your
lumped element it's ok, you can connect the impedance element to your port and
CST will do.
But if you want to check also how much your lumped element is matched with the
whole structure, i advice you to use the discrete port instead lumped element .
Best lucks,
There very good reasons to handle this kind problem in the Rf and microwave range using ports. Of course you can always find a workaround but its less efficient.
It should be kept in mind that when you are using ports with say 50 Ohm (can be any other value if handled consistently) that then generator is automatically matched to this characteristic impedance and absorbs any (possibly ) reflected wave the object under investigation by definition(similar to a well (open short load or electronically calibrated) vector networkanalzyer even when the ports of the VNA are not very well matched without calibration.
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