Diffraction grating of SPR
error specifying "selection is empty" during parameter sweep computation . What does it mean?
View Articlehow to simulate negative refractive index material by transient solver
Hi Does anyone know how to simulate negative refractive index material by using transient solver? I tried to simulate superlens in time domain but can't get convergent solution． best
View ArticleAdding Refractive Index
Hi I m a beginner in COMSOL. I m working on GaAs-Air interface. I want to know how to add refractive index to GaAs manually from material properties. I searched in material properties but couldn't...
View ArticleNormalized far field scattering plot of metamaterial invisibility cloak
How to plot the far field scattering plot of different designs of invisibility cloaks (like linear cloak, square root cloak, etc.) which are normalized to the far field pattern of bare PEC cylinder....
View ArticleProblems about Periodic Conditions in the tutorial model “Periodic Boundary...
Hi all, Recently I confront one confusion about periodic conditions in the tutorial model - Periodic Boundary Condition. In Periodic Condition, it selects only boundaries 1 and 6 which are parallel...
View ArticleSimple optimization in comsol 5.0
Hey Everyone I'm trying to do A simple optimization in Comsol 5.0 However it keeps giving me an error. In the attached image you can se how I set it up. A quick summary: under definitions I have...
View Article2d & 3d results mismatching
hello sir, i am designing the resonator structure using piezoelectric module. i designed the device and plotted all required results but my problem is that i designed the devise in both 2d and 3d model...
View Article2d circular waveguide TM and TE modes
Hi, everyone. Excuse my poor english. I'm working on a comsol (5.0) model (mode analysis, RF module) on step-index fiber (2d circular waveguide), following the idea of...
View ArticleEigenmode simulation
Hi, I was wondering to ask if I can simulate eigenmode solving in RF module. In fact, I can do that in Optics module, but I want to know if it is possible to do that in RF module. In first attempt I...
View Articlemeshing metals intelligently in rf problems
From what I’ve been able to figure out, COMSOL doesn’t really know how to mesh bulk metals (where the minimum dimensions are much greater than the rf skin depth) intelligently. There is no rf field...
View ArticleHow to draw a periodic waveguide?
Hi all, I have a simple question towards for geometry for which I didn't a lot of search but still confused. So how do you draw a periodic waveguide that has a simple mathematical expression in 3D? For...
View ArticleExpressions for time stepping are invalid
Hello I keep getting the error "Expressions for time stepping are invalid" no matter how I try to change the information about the time steping. I am using the RF module, Time explicit The expression I...
View ArticlePort boundary condition: what's relation between "port input power" and "E...
The port boundary condition is quite useful for exciting the model with an EM wave. However, the description of the port boundary condition's "Port Mode Settings - User Defined" in "RF Module: User's...
View ArticleArtefact on the periodic boundary
Hi all, I am trying to reproduce the results for the structure studied in Phys. Rev. B 85, 245401 (2012). (I have attached the schematic of the plasmonic structure.) I can obtain a reflection dip...
View ArticleBoundary selection for ports
Hiİ am simulating the model files of waveguide: :www.comsol.com/model/download/....dielectric_slab_waveguide.pdf and i have following question,İn this model they have used the entire left boundary as...
View ArticleCan S11 or S21 be less than 0?
Hi, All In the module 'Frequency Selective Surface, Periodic Complementary Split Ring Resonators' on the website of COMSOL, we can get analysis of S-Parameter by 1D plot group. The module has already...
View ArticleNear-field magnetic field simulation of RF antenna
Hello, We are trying to maximise the magnetic field produced by a loop antenna driven at 300 MHz, at a distance of ~20 cm from its centre. We wish to simulate it both in free space, and with a sheet of...
View ArticleLight Propagation in Tissue
i just want to simulate the propagation of monochromatic light (800nm) in a 3 Layer tissue model 3D. Does anyone know a working Comsol solution? Problem: to many elements with this wavelength. Setup: 3...
View ArticleRF Module: Simulation of an Axisymmetric structure without axisymmetric...
Hi, I am facing an issue with a 2D axisymmmetric model, in the RF module. I my 2D geometry (simple rectangule for the moment) I set the top boundary to be a Port, where I want a certain excitation with...
View ArticleHow to mesh very thin films/ layers in MEMS switches? How to make use of...
I want to run electromechanical simulations on MEMS double clamped structure. The problem I am facing is on meshing the thin features in the structure. The top electrode and bottom electrode are each...
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