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Hi,
I face a quite challenging problem...I am interested in simulating a current source with infinite length, inside a waveguide with finite length, terminated by two CFS-PML layers. The current source is in the form of hollow surface with components on x,y, and z axis, varying with the time...
Consider a rectangular tapered waveguide, reminiscent a horn antenna. Of course, the inclined PEC walls cannot accurately be represented by the Yee grid due to the staircase approximation. Here comes the CFDTD where in the cut-cells, the integral form of Faraday law for H field is applied...
Hello,
As far as I know, S Balance denotes the dissipated power from a structure's ports, and it is equal to unity for a lossless structure.
I considered the following simplified structure: A smooth cylindrical waveguide where its middle section has a larger radius compared to that of the...
Hi all,
I have developed a FDTD code employing CFS-PML layers for the BC, and simulating waveguide structures. For this reason, the PML conductivity is scaled along z-axis and as a consequence, only the transverse field components (Er,Ephi,Hr,Hphi) "feel" the PML layer. By using a waveguide...
Hello,
According to Lumerical's help for the mode expansion monitor, am and bm coefficients represent complex transmission coefficient for mode m. However such and explanation is not clear to me enough. My first question is how these coefficients are related to the scattering matrix? Can we...
Hi all,
I have a simplified model to study, which is the excitation of a smooth cylindrical waveguide usint a TEmp mode. Up to now, I used hard sources and therefore the transverse components of the electric field on the boundary was forced to specific values, according to the mode...
In my case this is not valid. Note that I excite with TE11 and measure the S11 and S21 of the same mode. I have simulated in CST studio a holow waveguide with a "brick" inside, and measure S11 and S21 and |S11|^2 + |S21|^2 = 1 is not the case. I suspect mode conversion due to the obstacle
Hello,
I'm trying to calculate scattering parameters from a 3D FDTD code. I consider an "abritrary shaped" scatterer within a smooth waveguide. In order to calculate the S parameters, I express the fields on the basis of modal eigen fields at two different ports as a sum of a forward and a...
Hello,
I calculate S parameters using an FDTD code. I have monomode excitation and I calculate S-Parameters for more than 1 modes. I see that the |S11| below cutoff frequency of each mode is positive and very large. I know that this is due to the fact that each mode, below cutoff, is purely...
Hello,
I am looking for analyzing a signal on transverse plane (x,y) to a certain number of modes. I found a paper but I cannot find it anymore.
I have a basis of modes and I would like to analyze the transverse field distribution on this basis. I know there is a way to do this using integrals...
Why square the magnitude? To take the reflection coefficient of Power? But in order to square the magnitude and go from voltages to power calculations, power waves according to Kurokawa have to be supposed
Thank you for the answer, I suppose the fact that the waves are guided makes the method inappropiate. One more question, in reflection coefficient should I take the magnitude of the ratio \[\frac{Z-Z_0}{Z+Z_0}\] or the ratio of the magnitudes, \[\frac{|Z|-|Z_0|}{|Z|+|Z_0|}\]. I know that these...
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