the mass matrix is zero
Hello I am trying to simulate my design. In the first step, I tried Mode Analysis but unfortunately I faced this error: The mass matrix is zero Please let me know how can I fix it? Of course I read...
View ArticleWhat's the difference between the "harmonic propagation" and "scattered...
Dear all: IN the RF => In plane wave model ,What's the difference between the "harmonic propagation" and "scattered harmonic propagation"? Q2. if I set the square and draw the rectangle around the...
View Articlephotonic crystal fiber
Hi, I am a beginner of comsol v 4. I tried to design a pcf with hexagonal pattern of airholes (five rings). pitch=2um and d=1 um. I got real part of effective mode index but don't get any imaginary...
View Articleconfinement loss
Hi is imaginary part of refractive index could be positive or negative that means 1.028175433939737e-19 or -1.028175433939737e-19. I found in my simulation positive and negative values for different...
View Articleparameters names must not be empty
Hey, again, this is an error I ha with comsol 4.3: parameters names must not be empty I need a quick help attached is my comsol file, you just need to run it and see the error. and also i attached a...
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 ArticlePhotonic crystal fiber
I am trying to model a photonic crystal fiber with liquid crystal filled holes.. I am a starter and it would be really helpful if any one can help me regarding the resources from where i can learn the...
View Article2 Separate Stranded Coils in Multi-Turn Coil Domain
Hi all, I have 2 separate stranded coils to be modeled for transient behavior (Current Pulse input). Since these coils are not of regular shape (linear or Circular), i had to go with numeric coil type...
View Articlesolid core photonic crystal fibers
hai. Iam doing research on solid core photonic crystal fibers I have doubt in calculating mode field diameter and confinement loss of solid core photonic crystal fiber Presently doing simulation using...
View Article3D RF Module Calculation on Multiple Cores
I am planning to build a computer for running Comsol, and was hoping to find out how well Comsol can utilize multiple cores for RF Module calculations. The most demanding calculation that we would like...
View ArticleHow to mesh very thin films/ layers in MEMS switches? How to make use of...
I want to run electromechanical simulations on MEMS double clamped structure. The problem I am facing is on meshing the thin features in the structure. The top electrode and bottom electrode are each...
View ArticleQuestion on a thermal lens
I have encountered a problem. I put a silicon glass slab exposed under a Gauss beam. Air cooling is added. For the first step I used RF to see how the light transmitting through the slab, which is...
View ArticleGhost domain, bug?
I have a curious problem with Comsol (4.3b and 4.4) with ghost domains. If i look at the geometry and select all domains, i have, ie 10 domains. When assigning materials, then the 11th domain appears...
View Article1D rcs plot of a cylinder with respect to aspect angle
I have simulated rcs of a perfectly conducting cylinder. Results are shown in polar plots & also in 3D plots. But in case of 1D plot i am unsure about the rcs expression for the y axis parameter. I...
View Articleoptical properties versus chemical composition
Dear All, I want to know how Comsol can predict the optical properties of materials versus chemical composition? does Comsol have this capability? If yes, which Madule I have to use. Thank you very...
View ArticleHow do I retrieve cross- and co-polarization T/R data from heterogeneous...
COMSOL'ers: I have a complex periodic array structure (dipole on substrate on ground plane) illuminated by an oblique plane wave. If I were to define an incidence plane (say x-z plane) and launch a TM...
View ArticleLimit number of eigenfrequency solved for
Hi, In my optimization process, I would like to maximize one cavity mode's quality factor. But since there is a neighbor mode has higher quality factor. Comsol always optimizes the neighbor mode...
View ArticleSingular matrix error occurred
I am finding eigen frequency of two helical coils for wireless electricity. every thing is goes well: geometry, materials,Electromagnetic Waves- Frequency Domain & Mesh . But when I compute,...
View ArticleWaveguide Modeling
Hi, I am trying to make a simple model where a light source is incident of an input port of a waveguide and then it passes through a different media. I need to see the output power (Intensity) at port...
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