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There's no contradiction. Any propagating field other than a plane-wave, in particular fields which are confined in space or fields with space-dependent amplitude like the one you described (if I understand correctly), can be described as a superposition of plane-waves propagating in different...
After you simulate, make a plot of S21 (between one port and the other) and it will give you the ratio between the power received by one antenna and the power inserted into the other one. If you simulated in one frequency only, go to the simulation information window (forgot how it's called...
Well, if you draw and simulate your antenna, you can plot the antenna impedance as seen from the port. That way you can see if it matches. To get a particular impedance out of the antenna is a different matter. Perhaps you can find an approximate analytical formula somewhere, that will give you...
Sounds like you left your antenna open circuited. In that case, the power from the incident wave has nowhere to go but back to the port, so you see full reflection.
Terminate the antenna with a conjugate matched load or some sort of port with the proper impedance and you will see proper absorption.
Hi guys,
I'm using HFSS to simulate an antenna, and I've run into an interesting problem.
The antenna is surrounded by a standard airbox, lambda/8 at the longest wavelength away from the antenna, as recommended.
I'm interested in simulating the effect of an infinite ground plane on the...
Hi,
Just a thought, HFSS computes the antenna parameters at the solution frequency by default. Make sure you solve at the correct resonant frequency and then compute the parameters. I don't recall now, but maybe if you do a fast sweep and tell it to save all the fields, you can also calculate...
FFT for cos+cos
Hi,
First of all, to clarify, we are talking about the Fourier Transform, not FFT. FFT is a discrete-time transform that may yield entirely different results based on the frequency of the cosine function and the sampling frequency.
Now, regarding the FT of a cosine function...
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