How-to : Transmission Spectra vs Wavelength
Hi I had attached the concept of my simulation as picture where you can understand my idea. For obtaining Wavelength vs Transmission spectra I need to include all Refractive index (n and K values of...
View ArticleLight reflectivity and transmitivity of periodic surface structures
Hello, I am trying to simulate the reflectivity and transmitivity of different wavelengths of light on a periodic surface structure. 1) I am using a 2D simulation using the RF module to create a basic...
View ArticleNeed to simulate very thin layer with permittivity and permeability tensors
I am simulating an antenna structure in the RF module. Unfortunately, due to 3 dimensions of variability, no 2D models are suitable. Therefore, I am using a 3D solver. I have an impedance sheet...
View ArticleLight propagation in silver nanowire
Dear all, I am trying to simulate the light propagation in silver nanowire by exciting its one end of nanowire. Kindly please suggest me how to do it. Thanks
View ArticleRecovering desired eigenfrequencies
Hi, I'm performing an eigenfrequency analysis of a model in the Comsol 4.3a RF module. My problem is that, though I ask for only 1 eigenfrequency, Comsol ALWAYS gives me 2 eigenfrequencies: one purely...
View ArticleHow to get only real frequencies
Hello. I am running eigenfrequency study in RF module. I set the frequency and amount of solutions to find. And I am getting among good solutions some complex eigenfrequencies corresponding to non...
View ArticleInitial parameter value effects parametric sweep
I am using a parametric sweep to vary the wavelength of incident light for a nanophotonics simulation, but I'm finding that the initial value of my wavelength parameter effects the results. The...
View ArticleNaN or Inf found when solving liner system using SOR,RF devices,...
Hello All, I designed a Non-Reciprocal device using Ni78-Fe20. I like to plot the real and imaginary part of s-parameters, so I enable the (split complex terms) under solver but when I am trying to do...
View Articleinconsistency between "neff" and "beta"?
I am using "Mode Analysis" study to find a guided mode in a structure. I can ask Comsol to compute separately the effective index of the mode (neff) and the propagation constant (beta). The...
View ArticleConvergence: when should I stop the model?
Hi everyone I have been working on models that take several days to solve. One of them is running at the moment, and I just have a general question. When I look at the Convergence Plot 2, which is...
View Articleapplying plane wave
I am modeling Shielding effectiveness of the block (in 2D), so I am applying plane wave in the x direction and considering periodic boundary condition for boundires in y direction. To have plane wave I...
View ArticleIntegral over a arbitrary path
I am new to COMSOL. I am interested to calculate the characteristic impedance of a co-planar waveguide in the RF module. I am referring the example "Finding the Impedance of a Coaxial Cable" for the...
View ArticlePatch Antenna S11 Problem
Dear All, I have been simulating very basic patch antennas. However when I compare simulations with measurements I always get very different plots (please see the attachment). Can it be about COMSOL's...
View ArticleInitial condition drift when sequencing COMSOL through Matlab
Hello, I’ll start with my question and then explain the problem which gave rise to it. Is there a way to insure that the initial temperature condition in a transient heat transfer problem is the same...
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 Articleradiative deccay rate & nonradiative decay of the fluorescence molecule
Hello everyone I want to calculate the radiative deccay rate & nonradiative decay rate of the fluorescence molecule near the rough metal surface. I want to know whether the molecule should be...
View ArticleHow to realize PI controller ?
How to set relate parameters? For example , voltage control temperature . thanks.
View ArticleAbout optical force calculation of particles manipulated by microring resonator
Hi,everyone. I want to simulate a structure which includes two bus waveguides and one microring resonator to form an on-chip optical tweezer. One microparticle is placed in the gap area between one...
View ArticleDoes size of Geometry affect the solution ?
I am looking for electric field distribution in a coaxial waveguide. Now if my waveguide is of order of mm range, the electric field pattern is uniform and matches the analytical solution for TEM mode....
View ArticleRF field - initial value - comsol 4.1
Dear forum, I ask for an advice in the following things: 1) Is there a predefined Poynting vector in RF module?& where exactly can I list through the comsol-names for physical quantities? 2) I have...
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