how to transform a frequency domain model to a time domain model?
Hi, I have a simple question (Comsol 3.5a). For example, I build a waveguide in 2d harmonic TM modes. Then solve it for different frequencies and saw some wave proportions patterns. Now I want to turn...
View ArticleForce per unit length or area
Dear all From a solution of 2D structure I get Maxwell stress tensor over a boundary, which I further want to apply, in a separate problem but on the same 2D structure and boundary, (using solid...
View ArticleResonant cavity modelling - works in 2D, not in 3D
I've got a question about how resonant cavity modelling is properly done in COMSOL (specifically 3D). I'm modelling a cylindrical cavity and applying a high frequency signal by a small coax probe at...
View ArticleBackground field
Hello to everyone, Does anyone know, if I can use solution from one component as a background field for another component? Geometries are the same(all sizes and shapes) If yes, how?
View ArticleSuperconductor in RF module
Hi all, Is there a simple way to define a superconductor material and directly assign it to a boundary in emw simulations? I saw some papers using PEC instead of a real superconductor but I'm not sure...
View ArticleScattering problems, background field
Hi! Does anyone know how to define background filed ( in Ewfd, solve for scattered field) as an interpolated function from Comsol?
View ArticleHow can I do coupled simulation with Electromagnetic Field Transient (RF...
I am working in COMSOL 5.1 and 4.4. I am trying to model a coaxial cable with coupled simulation having Electromagnetic Field Transient (RF module) and Electrostatics(AC/DC) solvers?.. Please tell me...
View ArticleThird-order non-linear response (optics)
Hello COMSOL Community, How can I simulate the value of the coefficient χ(3) for an geometry i build in COMSOL. Best wishes, Fabian
View ArticleComplex conductivity in RF transient model and absorption boundaries
I have been studying a Gaussian beam incidents on an absorbing material. The result is reasonable before the wave hits the material, but starting to give strange results afterwards. Especially, when...
View ArticleDielectric heating between parallel plate electrodes
Hello all, I'm fairly new to Comsol. What I'm trying to do is model the heating of a dielectric in between two parallel plate electrodes at a frequency of 27.12 MHz. I would appreciate any suggestion...
View ArticleDifferent Solution when "Non-Relevant" Parameter is Changed in 3D (but not in...
Hi all First of, thanks in advance for reading and hopefully reply to this thread. The main problem is, that when I change a parameter in a 2D simulation, the results do not alter and that's how it's...
View ArticleHow to export the data of far-field pattern
Hi! I am a newbie to COMSOL and I just managed to compute the scattering of electromagnetic wave by a PEC ellipsoid. I exported the data of far-field pattern to a csv file. As far as I know, the...
View ArticleSAW: Change of propagation mode from Rayleigh to Love mode
Hi All, I am learning about SAW(Surface Acoustic Waves on Piezo substrates) and I tried few examples for designing filters which uses Rayleigh mode as the propagation wave. But, I could not find...
View ArticleDefining a permittivity and permeability tensor in the RF module
Hi Guys, I'm relatively new to Comsol, I'd like to model an anisotropic material in comsol, however my material should have a permeability and permittivity that are tensors as opposed to scalars, and I...
View ArticleSimulating chiral media
Hi, I am trying to simulate chiral media as explained in "alphard.ethz.ch/hafner/Workshop/Comsol2009.pdf". My understanding of adding the chiral expression for the electric displacement is that I add a...
View ArticleBi-anisotropic medium
Hello, I am using COMSOL 4.3a and its RF module to simulate electromagnetic structures. I would like to know if it is possible (and if yes, how) to implement fully bi-anisotropic medium ? So far, I was...
View ArticleThe field of graphene-based plasmonic waveguide
Hi, everyone. I have recently simulated graphene-based plasmonic waveguide at 10 THz. The thickness of graphene is set to be 0.7nm. I use relative permittivity to represents the graphene. Now, when the...
View ArticleSimulating a magneto-electric media
Hi, has anyone used COMSOL to simulate the magneto-electric media. If yes, please do contact me, i need some discussion. Thanks
View ArticleExporting Ex field in MATLAB function
Hi to all i would like to export the value of the Ex field in a MATLAB function (this is just because i would like to express the electrical conuctivity as a function of Ex), but none of my attempts...
View Articlenonlinear refractive index
Hello COMSOL Community, How can I determine the value of the nonlinear refractive index for an geometry i build in COMSOL? Best wishes, Fabian
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