Far field calculation in metasurface

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Hi guys. Now I am facing a problem of getting far field from an array. When calculating the near field, periodic condition is applied and only a single unit is calculated. But when I tried to apply far field node in the model, I think COMSOL only do stratton-chu equation on the single unit but not the whole array. Since I want to calculate the far field from the whole array, I think I need the integral on the whole surface of the whole array. Is there a solution for this problem now? Thanks!


2 Replies Last Post 16 sept. 2025, 20:52 UTC−4
Robert Koslover Certified Consultant

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Posted: 8 hours ago 16 sept. 2025, 20:27 UTC−4
Updated: 8 hours ago 16 sept. 2025, 20:36 UTC−4

I recommend you study the example model: "microstrip_patch_antenna_periodic" in the Comsol-supplied Application Library. "Modeling of a Phased Array Antenna" Application ID: 88011 . See https://www.comsol.com/model/modeling-of-a-phased-array-antenna-88011 . Be sure to read the discussion of how the far field computations are done in the associated .pdf file. You need to apply an array factor.

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Scientific Applications & Research Associates (SARA) Inc.
www.comsol.com/partners-consultants/certified-consultants/sara
I recommend you study the example model: "microstrip_patch_antenna_periodic" in the Comsol-supplied Application Library. "Modeling of a Phased Array Antenna" Application ID: 88011 . See https://www.comsol.com/model/modeling-of-a-phased-array-antenna-88011 . Be sure to read the discussion of how the far field computations are done in the associated .pdf file. You need to apply an array factor.

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Posted: 7 hours ago 16 sept. 2025, 20:52 UTC−4

Yes! From the math structure of stratton-chu, I also found that a phase factor is necessary to solve it but my mates not always agree with me. Your advise is really helpful for my work. I will look at it to if there is a difference between my factor and that factor. Thank you again.

Yes! From the math structure of stratton-chu, I also found that a phase factor is necessary to solve it but my mates not always agree with me. Your advise is really helpful for my work. I will look at it to if there is a difference between my factor and that factor. Thank you again.

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