Negative transmittance in comsol
Hello everyone I am simulating a model for periodic silver sphere for in-plane and out-plane polarization. But when i am plotting the transmittance in case of in-polarization with angle of incident 50...
View Articleextract the eigenvalue from Mode analysis via Matlab code
Hi, I know in version 3.5, use "fem.sol.lambda" to extract the eigenvalues. But I suffered a problem in version 5.0. How to extract the effective mode index or eigenvalues in version 5.0 with Matlab...
View ArticleCircular port excitation fails with piecewise stacked circular waveguide
Based on the "h bend waveguide 3d" model in version 4.3b I try to simulate a dielectic loaded circular waveguide geometry. The waveguide consists of three cylinders with identical inner diameter and...
View Articleeffect of temperature on antenna radiation pattern
Hi Everyone. I have a Dielectric Resonator antenna. I have its radiation pattern and gain. Now I want to set dielectric block temperature to some degrees, say 50degC. And now I want to check its...
View ArticleBehavior at Axis of Symmetry
I am simulating a 25 nm radius gold wire in a dielectric cladding. I am measuring the characteristic impedance of the mode of the wire. I have run it in both 2-D axisymmetric and in eigenmode analysis....
View ArticleHow to plot quantum efficiency
Hi all, I'm a new COMSOL 4.4 user. For my master study I'm trying to learn RF module applications in COMSOL. My topic is quantum well infrared detectors with prism and pyramid geometry. I have...
View ArticleEffect of one physics in another physics
Hi Everyone. I want to ask a question about physics coupling. My question is , how to see the effect of one physics in another physics. For example, I want to see the heat transfer effect in Radio...
View ArticleCoupling Heat Transfer w/ RF Module
Hi I am wondering if it is possible to use the RF module as a heating source, similar to the tutorial model that uses joule heating. I am attempting to do so, but I keep running in to this error....
View ArticleVery Urgent: Piezoelectric Filter Lumped Port Problem
Hi I am trying to find the s parameters of a mechanically coupled piezoelectric filter with lumped port. But even though I have defined the perfect conductor, I get this error: Errors during...
View ArticleSimple 3D Plane Wave (RF module)
Dear Community, As a first step to a more complex problem, I would like to model a simple 3D electromagnetic plane wave. To do so I tried the following: - draw a simple box, set material as air -...
View ArticleHow to couple multiple physics
Hello, I have a big issue when I try to model harmonic generation in plasmonic nanoantennas with the RF module. But this can be a general issue when you must couple multiple physics. I am simulating...
View ArticleInfinite dipole in high frequency
Hello. I'm a beginner in Comsol simulations and i want do simulate a infinite eletric dipole to see the far-field pattern and compare with analytic models, but when I approach the frequency to 1GHz the...
View Articleplot 3d surface image
Dear all, I have built an 3d RF geometry and excited it with light. By plotting the electric field surface on this geometry, I want to display the surface without built-in electric field applied on the...
View ArticleS-parameter and port BC
Hi everyone I am studying the emissivity of a surface. In order to consider higher orders of reflection or transmission, we need to add several port BCs. for example in my case I am trying to obtain...
View Articlemode analysis of a waveguide
Dear all, I'm trying to reproduce the results which is on www.comsol.com/cd/direct/conf/.../11847_frezza_presentation.pdf (Comsol conference 2011, page 7, symmetric case, neff). Could you let me know...
View Article"Geometry number out of range" in comsol43a
Hi everyone, I am trying to combine the results of two different simulations and don't manage to do it. First I simulate a 3D structure, and I export in a .txt file the tangential electric field on a...
View ArticleWaveguide filter based on resonator: External quality factor
Hi Comsol community, I try to design a waveguide filter based on resonant cavities. From the filter theory I can obtain the needed coupling factors between the cavities and the needed external quality...
View Articlecapacitance between multiple plates
good morning; i have a three plate 2D problem and i would like to calculate the capacitance between the relevant plates. over what surface do i need to integrate to get capacitance? when i calculate...
View ArticleReducing computation time of model by splitting about symmetry plane - help...
Hi, I am doing a model where I want to compute the eigen solutions of a system of two coupled split-rings at different separation distances. In order to reduce computation time, i have split the system...
View ArticleHow to vary the magnetic field?
Dear All, In Wave Optics ----> Electromagnetic Waves I wish to study the effective refractive index variation w.r.t. variation of the magnetic field. Here, I need to know how to vary the magnetic...
View Article