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184 Threads found on 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).
Hello, can the HFSS eigenmode solver be used for structures which are not completely surrounded by metallic walls? (for instance a parallel plate waveguide, without side walls). If so, what type of boundary should I choose? I tried for rectangular waveguide and the resonance found are those of a rectangular cavity, not of the (...)
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
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 (...)
Also depends on a particular mode. O.K., it's not only multiplying the wavelength with √Er, you also have to put in the reduction factor for width and height when calculating the cut-off frequency. But in case of a completely filled waveguide, it's just a geometry factor.
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 (...)
just select the face and set it into waveguide port. you don't need to set the mode just set the harmonic order
Sounds like you are talking about coplanar waveguides. In contrast to usual pipe-like waveguides they are transmission lines with a center conductor, operating in TEM (transverse electro magnetic mode). My suggestion is to study the basic stuff about transmission lines and conducted electromagnet
Also, be careful of your tone of writing. Condescension isn't appreciated on this forum. As far as I'm aware of, jiripolivka is acting courteously and polite in forum discussions. I guess he stumbled upon you "have been studying through microwave engineering books" and - apparently don't understand the nature of TEM waves. To mak
May be you reading something into the term "excitation" that it doesn't mean. It simply means that you are feeding a high frequent signal to the waveguide and it propagates therein as an electromagnetic wave of a specific form or "mode". The wave mode is commanded by the field pattern of the transition (capacitive or inductive coupler, (...)
Hi, In fact, you can define the number of mode you want and after excite (with the edit sources) your bend (on one wave port : eg 1 or 2) with one mode. After simulation, you can plot the S parameters. Ex : S(1:1,2:1 ) who means transfer S parameter from port 1 to port 2 only for mode 1 (ie : TE10) other examples : S(1:2,2:1) transfer from (...)
Hi question is that while simulating a mpa at 2.45ghz I got error message that reads "the first mode at inhomogeneous port 1 is hybrid .this could lead to an inaccurate energy balance ." How can I remove This... 2.second error is " inaccurate definition of internal waveguide port" Please help...
In my knowledge, TE mode with the angle of incident wave =0, that is TEM mode.
i want to use coupling loop to be the coupler of a hollow dual mode rectangular waveguide cavity resonator. The question is no matter what the angle between the coupler and the magnetic field in the cavity, The H field direction in one of the mode will be parallel and the other one will be perpendicular to the coupling loop. So the S21 (...)
Hi, I am working on waveguide filters synthesis, which contain T junction. I use mode matching method to analyze the structure then I find 3x3 scattering matrix, but I don?t know how to make the cascade of two T junctions. Can I convert the 3x3 scattering matrix to ABCD matrix? If yes who to find the final ABCD matrix 93886[/AT
Some options: First, increase the number of modes for the waveguide and look at which frequency this mode is propagating. Maybe you can reduce your frequency span. Second, change the dimension of the waveguide! Regards
Hi everyone, i will need to design a 4-port waveguide coupler for square waveguide and the center frequency in 19GHz. Each kind of dimensions for the 2 square waveguides, holes or other are good. In addition, the waveguide should be parallel in order to connect other downstream levels To start, it can be good also a (...)
Hi, defining a wave port for CPW even mode need too take into account different aspects such your CPW aspect ratio. A simple way to define ports for CPW is to use Lumped ports. I recommend you to review the following thread (specially the attached
The wr-22 waveguide covers 33 to 50 GHz band which is named Q-band. I do not understand the picture you show. The multi-hole couplers have the coupling holes in the wider guide sides (or narrow sides) but I do not know the arrangement shown in your picture. Both waveguides must use TE10 propagation mode which is dominant. Typical standard (...)
You can you the prorogation constant, which is the im(gamma(portNumber:mode)). If you could be more specific as to what you are trying to optimize about the waveguide it would be helpful.
Hi. I´m doing simulations with a patch antenna, fed by a CB-CPW line... And though I thought i knew CB-CPW well... Some doubts have shown up... Your help will be kindly appreciated. I now there are more modes in this structure but i guess the usual propagating one is the CB-CPW mode, from center strip to lateral and bottom ground planes. I alway
the most obious thing is the inner diameter-if it is too big waveguide modes can propagate in addition to the mode on the coaxial cable. that would be bad there is a N connector that works to 18 ghz. It has a special inside shield connection to reduce the maximum internal diameter.
S(3:2,4:2) means S(3,4) in mode 2 excitation at port 4 to mode 2 response at port 3
Hi, I suppose that your port is a waveguide port... and then the CST meshing need to have 3 meshcells free (no PEC!) to calculate mode, impedance... that means that you have metal or other PEC in this area of the port. Then check your port excitation, background properties and boundary conditions ! Other solution, if
i'm looking to plot power patters in a multi mode rectangular waveguide. in matlab i would make electric and magnetic field expressions and find the poynting vector magnitude on a two dimensional plane. but my work for now is just a feasibility study, what are my quicker options in doing this? cheers
You might find Moreno or Southworth helpful references for circular waveguide modes. The mode numbers in HFSS do not often match the numbering conventions in the literature. That adds fun to the effort.
Hello, Usually one can see circular waveguides to be excited in certain waveguide modes. But, how REAL waveguides are being excited via current sources? I'm particularly interested in exciting TE01 mode using a thin (or arbitary fat!) wire of a certain current density distribution in order to excite this (...)
Hello, I've managed to develop a FDTD code, in cylindrical coordinates, for studying mode propagation in a cylindrical waveguide. I have to cite that there is no PML region attached yet, so the waveguide is treated as a cylindrical cavity. At z=0 I explicitly set a certain waveguide field distribution, for the Electric (...)
I tried to design a DRA antenna in CST MWS whose file is attached along with.But I am not getting desired S parameters which may be because of ambiguity in applying ports to the antenna.I am applying a waveguide port at the feed line which is feeding the slot. I am supposed to generate TE mode in that waveguide port.Discrete port is applied (...)
Hello, I don't know how to theoretically explain following behaviour of TE01 mode in a square ridged waveguide: When I select width of a ridge to be considerable compared to the size of a waveguide (e.g. 1/3, 1/2) and simultaneously I am increasing the height of a ridge (parameter v in a picture) the cutoff frequency is changing (...)
I am working on mode converter..i have two issues as follows:- to give a TM01 mode to a circular bent waveguide in CST microwave studio..? to check on the output different modes coming out of circular waveguide in cst. The dominant mode of circular (...)
at volker muehlhaus: Sonnet EM does always use waveguide ports with defined reference impedance. This 2.5D EM cannot impress the pure evanescent mode. For this 3D model with waveguides, I used the Empire XCcell 3D FDTD
A "monopole" stuck into a waveguide (assuming along the centerline to excite a TE10 mode) will have a certain efficiency related to the impedance match over your operating bandwith and the conductor and dielectric losses of the actual feed. So, on average, assume 0.95 of the power gets thru (assuming a well matched launch). Then the (...)
Hi I developed a WR90 HFSS model for 10Ghz (TE10 mode) frequency. I got the results (graphs/plots) accordingly. My requirement is to get a table of Ey components of propagating wave inside waveguide at plane perpendicular to propagation of wave. Can i get such data from HFSS?
Yes, it is typical. You have vivaldi antenna and the end is very similar as waveguide horn antenna. Do you know something about waveguide mode? Your structure is too large (for > 14 GHz) and is it possible, that in your structure is next waveguide mode. That mean it is better set in properties of port (...)
looking in 2nd picture of transition from finline. @maurymw the picture on the right side shows the transition from unilateral finline (bottom) to hollow waveguide (top). The whole substrate is placed in parallel to the electric field maximum of TE10 mode in hollow waveguide.