Transmission of a pulse through cylindrical waveguide
Hi,
I have modeled a cylindrical waveguide of radius, a = 38.1 mm. For this dimension, the first (TE11) and second (TM01) cut-off frequencies are at 2.3055 GHz and 3.0118 GHz, respectively. The model, has therefore, been simulated between 2.2 - 3.1 GHz.
I want to transmit a pulse through the structure, and obtain the near-field response at a specific distance from the waveguide. For this purpose, I used the analytical form of the time-domain signal (under consideration) and generated data points using MATLAB. These data points are used as the input time signal in POSTFEKO. Next, I tried observing the output response and obtained the following error message: "The simulated frequency range and signal bandwidth have insufficient overlap". The .cfx and .pfs files are attached here.
How can I observe the output response correctly?
-Thanks,
Bidisha
Answers
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Have a look at the Section 3.13 "Guidelines for Defining a Time Signal" in the User Manual.
Also note that you do not have to run Feko with a discrete frequency loop. You can use continuous frequency sampling and POSTFEKO will do frequency interpolation to obtain the full bandwidth's frequency response.
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Bidisha - In addition to material in the user manual, you may also watch the webinar -
Time Domain Responses from Frequency Domain Results
- https://www.altair.com/resource/time-domain-responses-from-frequency-domain-results
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Altair Employee