Exciting dual antenna with two different frequencies simultaneously

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I am attempting to simulate the structure using COMSOL. Specifically, I am trying to excite a two-antenna array, each with four point sources, simultaneously at two different frequencies. However, I am having difficulty figuring out how to achieve this in COMSOL, as the tool is relatively new to me. I also tried combining the results of frequencies F1 and F2 in post-processing, but the outcomes seem incorrect.

Could you kindly guide me on how to approach this in COMSOL?

P.S: I mean antenna 1 with F1, and antenna 2 with F2 simultaneously.



1 Reply Last Post 03.12.2024, 19:29 GMT-5
Robert Koslover Certified Consultant

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Posted: 1 day ago 03.12.2024, 19:29 GMT-5
Updated: 1 day ago 03.12.2024, 19:36 GMT-5

If your physics is entirely linear (and I suspect it is), then you can combine the two separately computed results just as you described, working in the frequency domain. If there are any non-linear effects of significance, then you need to do this in time domain. (Note: I am assuming you are presently attempting to do this in the frequency domain.) Now, assuming linearity holds, if the outcomes in your model "seem incorrect" to you, then: (1) there may be one or more errors somewhere in the setup of the problem, involving one or both of the two frequencies, and/or in how you endeavored to combine the results, either in post-processing or elsewhere; or (2) another possibility is that the result that concerns you may actually be correct, but is also different from what you expected. To get this resolved, I suggest you post your .mph file to the forum so that other Comsol users reading this can take a look at it and offer you suggestions specific to your model and physics.

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If your physics is entirely linear (and I *suspect* it is), then you can combine the two separately computed results just as you described, working in the frequency domain. If there are any non-linear effects of significance, then you need to do this in time domain. (Note: I am *assuming* you are presently attempting to do this in the frequency domain.) Now, assuming linearity holds, if the outcomes in your model "seem incorrect" to you, then: (1) there may be one or more errors somewhere in the setup of the problem, involving one or both of the two frequencies, and/or in how you endeavored to combine the results, either in post-processing or elsewhere; or (2) another possibility is that the result that concerns you may actually be correct, but is also different from what you expected. To get this resolved, I suggest you post your .mph file to the forum so that other Comsol users reading this can take a look at it and offer you suggestions specific to your model and physics.

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