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184 Threads found on edaboard.com: Mode Waveguide
If you have electronics desktop 17, 2D extractor seems pretty good for doing this type of solving. If you're just using regular HFSS, a scattering analysis should give you a good indication of how much power is lost for your excited mode(s).
Eigen mode solver is not the right choice to study waveguide modes you want as Eigen mode solver takes every structure as cavity and calculates the resonant modes as this is from where this name Eigen comes from. I think for your purpose simulate your waveguide with frequency domain solver. (...)
It means that based on the size of the waveport, additional modes might propagate rather than just the fundamental mode. When assigning waveport increase the number of modes to include them in the simulation.
Hello. I am trying to simulate a simple waveguide using wave port in both ends. All seems to work, but I get several warnings saying: Discrete solution, process hf3d: Port Port1 supports an additional propagating and/or slowly decaying mode whose attenuation is xxxx and propagation constant is xxxx -- Simulating on machine: localhost
You can probably excite two coaxial modes on the pins (one on each). In HFSS, lumped ports should be OK.
For Filter design Driven mode is good specially if it is waveguide based filter. As in S-matrix solutions will be expressed in terms of the incident and reflected powers of waveguide modes. In case of microstrip based structure you can choose Driven Terminal, as S-matrix solutions of multi-conductor transmission line ports (...)
How to calculate cut off Frequency of hybrid mode(HE/EH) for circular waveguide ?
Hi Terminator3, I guess you are telling slots like "f" and "g" in this figure (waveguide in TE10 mode). Right? 130941 There is a bit of information in "modern Antenna Design, 2nd Edition" by Thomas Milligan (Wiley-IEEE Press, 2005), section 5-24 . (I saw more information in some other book, but now I don't remember
Hi arve9066, You can set the waveport excitation levels under HFSS->Fields->Edit Sources. The ports automatically "terminate" the structure, so long as the incident mode is solved on the port.
I am starting off with a simple case of lossless dielectric filled waveguide with lossy dielectric segments on it's sides. I did a parameter sweep varying loss and looking at Ez. I am interested in TM11 mode and hence would like Ez to be high. I am using the transient solver to run this. I put in curves at the input and output waveguide (...)
I'm trying to simulate a waveguide filter that has quite a large BW. I know from the simulating frequency that the second TE mode can propagate. However, when I add a second mode to the waveports I still get the following warning: Discrete solution, process hf3d: Port 2 (or 1) supports an additional propagating and/or slowly decaying mo
Each mode in a waveguide has a specific wavelength which is larger than the free space wavelength. Review the derivationtion in your favorite RF engineering text book.
Hi ktx2222, If your ports are each exciting more than one mode, then your S-parameters will have four indices (e.g., S(1:1,2:1)). The number after the colon is the mode index, so if your TE20 mode is mode 2, then S(1:2,2:2) is the transmission coefficient of the TE20 mode from port 1 to port 2. S(1:2,1:2) (...)
Hi please if any one knows how to do coaxial probe feeding please fix my feeding so it can be 50 ohms. uploading my design. waveguide excitation is not available here only connectors so kindly fix it for me. I have used Hfss software for my design. The horn is a transition from a TE10 mode in a waveguide to fre
hiii , i have to excite te11 and te21 mode in circular waveguide using coax feed . how to get the length and diameter of coax conductor protruding inside the circular wg. it will be changed in order to meet the waveguide impedence which is much greater than 50 ohm coax line impedence. similarly for te21 modes 4 coax excita
Waves of different mode propagate independently, generally all modes above the respective cut-off frequency are propagable. You'll usually try to avoid higher modes by the waveguide transition design, also in some cases special mode filter elements. - - - Updated - - - I mean different (...)
I guess cut-off frequency of regular wave guide, divided by square root (Er). Also depends on a particular mode.
Hello, I have a coaxial line of length L. run it at frequency f. No dielectric just one PEC cylinder in a vacuum cylinder. Defined waveguide ports. since this is a TEM mode, I would expect the s21 phase to be 2*pi*L/wl. It's not! What am I missing? Thanks
Hi,guys I am trying to correctly excite the TE21 mode in circular waveguide with HFSS. I set the number of modes as 5. The first two correspond to TE11 mode. And the third one corresponds to TM01 mode. The last two corrspond to TE21 mode. I used two perpendicular integration lines for (...)
Dear All, I am simulating with Lumerical: mode solutions (2013) a single mode Si waveguide on SiO2; the numerical method used by this simulator is EigenmodeExpansion. The geometry I am using as a reference is similar to a standard 500x220nm, which corresponds to very low simulated losses (it has already been (...)