S-parameters
Hello! I am using COMSOL RF module (emw, frequency domain) to simulate transmission line antennas. I excite my antennas using a lumped port. This is because I want to define a ground plane. Now, in the...
View Articlecoordinate stretching in PML
Hi Mr.Sergei Yushanov Can you tell me need of coordinate stretching in PML option.I found two options: polynomial and ration.so,please tell me when should i use this option?
View Articlehow to excite a plane wave in comsol
Guys: Anybody know how to excite a plane wave excitation in COMSOL? Really appreciate it Best Meng
View ArticlePort Definition in "Plasmonic Wire Grating" Model of COMSOL
Hi Everybody, In the solved model “Plasmonic Wire Grating” 6 Ports are defined for measuring different order of grating scattering. I tried to remove Ports 3, 4, 5 and 6 just to measure T0...
View Articleoptical absorption in GaAs
Hi, I am studying the plasmonic effects of gold photoconductive antenna on a substrate of GaAs and I follow the model of Plasmonic Wire Grating. I try to calculate the optical absorption on each point...
View ArticleMaxwell Stress Tensor
Hello all, I'm new to Comsol and Im having a little difficulty getting my head around how the Maxwell Stress Tensor operates. I understand its operation when applied to parallel wires (Like in the...
View ArticleNaN or Inf found when solving linear system using SOR
Hi COMSOL colleague, I had a problem in simulating trench waveguide. The structure is attached. I tried boundary mode analysis, and it works well. But if I perform the frequency domain computation, it...
View ArticleMetal-dielectric matrial interface
I want to design a dielectric block inside circular waveguide.our model is not time dependent,only frequency dependent so i want to use RF module.so,can any one tell me how to interface metal and...
View ArticleSearch for modes around... in Mode Analysis (RF module)
Hello, I'm trying to obtain the dispersion relation of a graphene waveguide which I previously analyzed via Matlab and on paper. In order to do this I set up a parametric sweep on frequency (angular...
View ArticleMaterial Data entering into COMSOL from LUMERICAL
Hi, I started using COMSOL recently, and whenever we need to add material data to it, for example, the permittivity as function of lambda we must upload an xl file with a table containing the material...
View Articleunequal number of points for vector field exported from a surface
I am interested in exporting the evaluated electric field vectors on a surface corresponding to the designed geometry (rectangular block). 1. I have defined the surface as a data set in the Results...
View ArticleWaveguide analysis
Hi , Can anybody tell me , how can we animate the slice plots in comsol 4.2 version ? With Best Regards R.K Jakhmola
View ArticleWhy did I get error with NaN/Inf ?
Hello, I am running a simulation for a solid oxide fuel cell, with three physics interfaces, accounting for fluid flow, mass transport and current distribution. But I can not get it converged, so I...
View ArticleSimulation error
Hi , I am getting this type of error whey i am trying to start simulation. "Variables property does not include all variables in Xmesh" Could anybody can give me any solution/ suggestion. Thank you...
View ArticlePMLs problem in Fresnel equations model
Hi, I have a problem with using PMLs (Perfectly Matched Layers) on the sides of a simulation. We want to simulate finite microstructures but first we decided to simlify the problem to a well-known one....
View ArticleHow to get the effective wave vector in infinite PhC
1.In the model "Bandgap Analysis of a Photonic Crystal", we use a set of wave vector to calculate the eigen-frequency, when loss is introduced (example: metal) ,how can I get the effective wave vector...
View ArticleLaunching TE11 mode in 2D axisymmetric
hi, i want to simulate a circular waveguide in 2D axisymmetric and want to launch TE11 mode.so,can any body tell me how to launch this mode.actually i am not getting desired result.
View Articlelaunching two modes simultaneously on same port
hi, if i want to launch TE11 and TM11 modes simultaneously on same port.Is it possible to do so?
View ArticleNot showing green tick mark for loss tangent in RF Module
Hi, I want to introduce loss tangent as material property in my model using RF Module.but whenever i add this property and it's value,it doesn't show green tick mark.so, what is solution for this?
View Articleoptical absorption in GaAs
Hi, I am studying the plasmonic effects of gold photoconductive antenna on a substrate of GaAs and I follow the model of Plasmonic Wire Grating. I try to calculate the optical absorption on each point...
View Article