Limit 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...
View Articlethe 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 ArticleExporting Far-field Polar plots data
I would like to export the Far-Field Polar plots data. When I tried to export , I cant plot similar to Polar plots in COMSOL. Any suggestions. It will be really helpful. Thank you.
View ArticlePeriodic boundary conditions
Hi I want to calculate transmission/ reflection coefficients from a periodic scatterer. If my incident wavelength becomes smaller than the period, COMSOL gives erroneous results. I guess its due to the...
View Articlecoordinates of geometry objects
Hi all! How can I access the coordinates of geometric objects/domains for using in an expression? Alternately: how can I use distance of a domain or primitive center from a plane in an expression?...
View ArticleIrregular grating modeling using ports or background field
Dear all, I am a novice at comsol and has been building my first model for some time. I want to calculate the scattered field caused by a plane wave incident upon an irregular grating (with dozens of...
View Articlex and y polarization calculation
Hi all, I am doing Photonic Crystal Fiber project. I want to analyze the birefringence, for that how can I calculate the the effective indexes in x and y polarization method? I think it is with post...
View ArticleRe-ordering of null vectors failed?
Hi, I'm wondering if anyone knows what "Re-ordering of null vectors failed" mean. I'm doing light propagates through a patterned nanostructure with periodic boundary condition, where the light has an...
View ArticleAC/DC
Hey. How can I view the field lines of electric and magnetic field? Thank you. Bye.
View Article2D axisymmetric numeric port settings
Dear all, I am trying to model EM wave propagation through a tapered step-index fiber. Because of the large size of my geometry and the symmetry of the problem I use the 2D axisymmetric settings. My...
View Articleidentity pair,assembly and port
Dear Ivar： My name is Guanjun Wang, a Chinese undergraduate student, i'm very appreciated of your selfless and accurate reply to many questioners, so i wanna ask you a question too, if convenient. I...
View Articleidentity pair,assembly and port
My name is Guanjun Wang, a Chinese undergraduate student, recently, I had encountered a problem about the identity pair. Using the assembly between two unions and creating a identity pair which...
View Articleidentity pair,assembly and port
DearEdgar： My name is Guanjun Wang, a Chinese undergraduate student, i'm very appreciated of your selfless and accurate reply to many questioners, so i wanna ask you a question too, if convenient. I...
View Articledielectric heat up in capacitor
I am modeling the dielectric heat up in parallel plate capacitor using microwave heating. I have watched all the relevant videos available and tried a lot of possible ways to change my model, but it...
View ArticleTransmission and Reflection of a Three layered Structure
Hi All, I had designed a three layered structure. Using PORT 1, I excited the EM wave from the top of the ITO(Indium Tin Oxide) and placed second port(PORT 2) at the bottom of Ag(Silver). I had...
View Articleidentity pair,assembly and port
My name is Guanjun Wang, a Chinese undergraduate student, recently, I had encountered a problem about the identity pair. Using the assembly between two unions and creating a identity pair which...
View ArticleWhy does my S11 parameter change when adding a 2nd inactive port?
When looking at off-normal reflection from a periodic structure, my S11 results change when I add a second, unexcited periodic port (S2x). My first periodic port is sending a TM mode in Hy, with...
View ArticleOpening older files
Hi, I just upgraded my mac OS and the admin installed a newer version of COMSOL (4.4). I was wondering if I still can open my simulations made in older version of COMSOL. I think I had 4.2 or 4.3 .....
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