About defining a TE/TM mode incidental light in 3D waveguide structure
Hi, everyone. Since we know we can use a 2D cross-section of waveguide to fine the effective refractive index. Incident light at the designed port can be difined as "Rectangle" with TE/TM mode. Here I...
View ArticleHow to plot the S11 plot of the patch antenna
I want to know how to plot the S11 plot for the patch antenna
View ArticleApplying bias electric field in RF module
Hello, I need to apply bias DC field on some material in my simulation. My simulation is running using Rf module. How can I combine this function in my simulation? I tried to add manually to the field...
View ArticleLaunch a Gaussian beam on a interior surface of a 3D model
Hi all, I'm trying to simulate a Gaussian beam shining on a finite size nanostructure, which is surrounded by PML. The Gaussian beam is launched on a interior surface and propagate along -z direction....
View ArticleIs "mphinterp" in comsol5.1 not working??
I am simply trying to extract the refractive index profile of a geometry using mphinterp(model, 'emw.nxx', 'coord', grid00, 'solnum', 14). However, it just returns a constant value. Is it another bug?
View ArticleRegarding RF Module
Hi, Problem: Interaction of structures with cylindrical EM wave. My question is "How can we excite a cylindrical EM wave in 'Electromagnetic Waves' node of RF module?". Plane wave can easily be defined...
View Articlevery large negative attenuation coefficient
I'm simulating a waveguide for Terahertz. Comsol returns me a very large negative attenuation coefficient in order of e11 when I extract "Real(-lambda)". Any help?
View ArticleWhere to enter dielectric loss
Hi, I am just confused, where should I enter the value of dielectric loss in the material properties? I have seen some topics inte the forum, mentios that I can write it in the relative permittivity as...
View ArticleHow to calculate photonic band gap, transmission and reflection spectra?
We want to get photonic band gap, transmission and reflection spectra of 1D or 2D PC. Could you help me how can I obtain band gap and Transmission/Reflection spectra of 1D or 2D photonic crystal? Or...
View ArticleDielectric Loss in RF transient simulation
Hello, I am trying to simulate a dielectric with losses in an RF transient (temw) simulation in Comsol 5.1. When doing frequency-domain simulations (emw), I set the permittivity of the material to be...
View ArticleMulti-Port S-parameter Calculation Simultaneously
Hi, Is Comsol able to calculate the S-parameters of multiports in s single computing ? For example, if i want to know s11 s21, s12 and s22 , i have to first set port 1 on port 2 off and compute to get...
View ArticleHow do I simulate a non-periodic nano-structures for plasmonics?
Hello. I want to simulate a non-periodic structure for plasmonics. for now, I can simulate periodic plasmonic nano-structures.(e.g. nano-hole array, post, grating, etc.) by using periodic ports and...
View ArticleZero boundary condition
Hi, I'm using the comsol version 5.1 and tryning to calculate chromatic dispersion of optical fibers. My question is about boundary conditions. I found PEC(perfectly electric conductor), PMC(perfectly...
View ArticleHow to set up the port?
Dear all, I use RF module constructing 2 models, which have same structures except the length. The input power and other parameters are also the same. But after simulation, the power at the incident...
View ArticleEffective mode area
Does anyone know how to caculate the effective mode area of the fundemental mode in an optical fiber using COMSOL 3.5?
View ArticleElectric field propagation in air
Hi. I want to make electric field propagate through air. But the electric field never propagate at all in my model. I want to see the temperature change of Aluminium nanoparticle with the electric...
View ArticleSampling of interpolating function at a particular point
Hello, I would like to sample the interpolating function defined under the "Global Definitions" node at a particular point. In my case this functions depicts the real part of the complex dielectric...
View ArticleSelective electric field Convergence at Chi3 contribution
Hi, I am looking for convergence of electric field distribution in a 3D tri-layer metal-dielectric system with the metal and dielectric material's electric susceptibility (chi3) contributions at...
View ArticlePeriodic boundary conditions
Hi everyone! I have a box with air and a wave that propagates through y – direction. On the sides I have periodic boundary conditions( floquet periodicity ). But the strange thing – the solution has...
View ArticleIs it possible to introduce phase discontinuity for rf/wave optics/ray optics...
Hi all, As we know that an ultra-thin meta-surface could introduce additional phase interrupt at the interface of two mediums, I'm wondering if we can apply certain boundary condition at the interface...
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