Particle tracing in RF module
Hello everyone: I want to trace a particle in the optical gradient field(In the RF module I have get the magnitude of the optical force). The optical force drag the particle into the center of the...
View Article2D Optical nanoantenna - results is not same as literature
Hi all, I tried to simulate the 2D optical dipole nanoantenna but have the result is not same as the literature. The literature said that the simulations were performed by launching a plane wave at...
View ArticleElectromagnet (Electromagnetic needle)
I am trying to model an "electromagnetic needle" that is relatively simple, but I want to be able to adjust parameters and optimize geometry, There will be somewhere in the range of 1,000 turns of...
View Articlehow to get the DEP force
Hi everyone How to get the DEP force in the particle tracing module? I add the DEP force in the particle tracing module and than study it. But the errors are as follows: Failed to evaluate variable...
View ArticleRF module coupled with particle tracing module
Hello everyone: I use the RF module to simulate a 'bowtie' structure. The 'bowte' generates the gradient field due to the plasmon resonance. On the base of the RF module ,I want to simulate the...
View ArticleInductive sheet impedance in transient simulation
Hello, I am using the transient RF module in Comsol 4.4. I want to assign a sheet impedance, Zs, on a boundary such that Etan=Zs*Js, where Etan is the tangential electric field on the boundary and Js...
View Articlegeometrical optics
hello, I need to plan a system that include a parabolic mirror. I'm OK with the parabola's geometric , but don't know how to define it as a mirror. I mean how making that an incoming plane wave...
View ArticleFloquet boundary conditions in multilayer structure.
Hi all, I am trying to simulate a multi junction solar cell (for eg: Si/SiO2/Al) and trying to study the electromagnetic behavior of it. For periodic conditions I had used floquet boundary conditions,...
View Articlehow to fix port boundary shown as "not applicable"
hi, I am a student studying COMSOL in Korea. I have a problem to model a electromagnetic waves, frequency domain. The problem is that I can only choose Port boundary as the outside boundary. In...
View ArticleProblems Solving Model - 2D Parallel Plate Waveguide w/Coupler
All, I'm trying to model a 2D parallel-plate waveguide that has coupling structures attached to the parallel-plate (very similar to conical horn antennae). I want to simulate the waveguide using THz...
View ArticleHi Ivar Kjelberg....please help me to solve this.Dielectric slab interfacing...
Hello, Ivar Kjelberg I am new with COMSOL 4.3b RF Module. I have to model a dielectric slab into a circular over sized wave guide.I am confused that how to interface it and how to apply boundary...
View ArticleHow to plot the permeability?
Hi all, I'm making a simulation about meta-material. And now I try to plot a graph about the permeability (real part). I try to do this by some ways, but all of this ways are only plotted the...
View ArticleERROR: Complex number encountered in real expression(when calculate the DEP...
Hello everyone: I use Particle tracing module for fluid to calculate the DEP force exerted on the nano-sized particles. When calculate the DEP I encountered a problem as follows: Complex number...
View Articleproblem with geometry & draw reflectinn spectrum of gating wave guide
Hi, I am trying to simulate Bragg grating in SOI waveguide(attached to the massage) but I have a problem with drawing the geometry: First: the horizontal scale is much larger than the vertical one so I...
View ArticleSurface conductivity in RF module
Hi all, I am calculating the mode profiles and effective indices a dielectric waveguide using the Frequency Domain module. I was wondering if it is possible to introduce a surface with a specific...
View ArticleNeed of applying scattering boundary condition in comsol
Hi Mr.Ivar, i am new with Comsol and using 4.3b version.I have a silly question.please,tell me what is need of applying scattering boundary condition in software..actually,for which purpose it is being...
View ArticleCoordinate stretching type
Hi, Can anybody 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 ArticleUndefined value found
I had great trouble meshing a geometry. After I refined the mesh and was finally able to mesh it, I clicked the compute button. 78 seconds later, I got this message: Undefined value found. - Detail:...
View Articleimplement both magnetic field and electric field boundary condition along the...
Hi everyone. I am using the RF module of COMSOL 4.4. My problem is to solve the vector wave equation in frequency domain (add physics-->radio frequency-->electromagnetic waves, frequency domain...
View ArticleBand Structures Calculation
Hi, Could you sent me the file of your calculation about the square lattice? Because I cannot get the same result which you attached. My email address is changyuhuhu@gmail.com. Thanks! Best Changyu
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