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113 Threads found on Mode And Waveguide
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 (...)
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 (...)
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 (...)
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
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 (...)
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 (...)
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.
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 (...)
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.
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 (...)
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 (...)
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 (...)
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 : (...)
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 (...)
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 (...)
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 (...)
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, 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 (...)
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 (...)
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 (...)
Drkirby is overly humble :) I would do exactly as he says for the mode information. Have Fun.
Hi jiripolivka, Thank you. Then I can think that in the case of beam-guides that you describe, the waveguide size is so big (radius >> wavelength) that in the central zone ("far" from walls) we have a wave that resembles propagation in free space, a planar wave in TEM mode. In othe words, there is a combination of modes that gives that (...)
I have simulated conductorbacked coplanar waveguide in CST. However I am getting only odd mode fields and not CPW mode ie even mode. Any Suggestions
Hello all, I am trying to design a transition between a 50Ω coax line and a rectangular waveguide with unusual dimension: ~200mm width and ~2mm height (a very wide and short waveguide) The purpose is to excite the TE10 mode with good matching and wide (...)
back to basic always. You know how to do a single step (lamda/4) transition, since you know the lamda/4 impedance matching formula, Zt^2=Zo*ZL So same thing for multi-step transition, we can still choose lamda/4 for each step, and make the matching from load to the source. If you are lazy to calculate it, build a model in ADS etc, and (...)
I'm designing a rectangular to circular taper transition in HFSS and CST, but doesn't seem to get it right. How should I define the TE10 for rectangular and the TE11 for circular (they say this is degenerate but i dont undestand what that means) in CST? or HFSS? Can someone explain this to me, and how to do this properly? (...)
for ur question 1- the embeded port should be to ground ,i.e.,if ur port at z=20 so reference plane should be -20 u run transient solver not frequency solver as u run time not frequency and that method called waveguide method if u use floquet mode(unit cell solver) u should running using frequency solver
I think sv147 is wrong. Yes, it is possible to have modes where Ez and Hz are both different than zero. Those are called hybrid modes. One example is the hybrid mode HE11 in a corrugated waveguide.
Good Afternoon Everyone .. I Would Like To Know What Are The Factors Affecting The Type Of The mode ( TM Or TE ) Traveling Inside A Slab waveguide ?! and Does The Dielectric Constant Er=10.2 Most Probably Gives A Hybrid mode ?! Best Regards .. Thanks Alot !
Boxes and waveguides enable you to specify substrate boundaries in the horizontal direction. A box enables you to set boundaries on four sides of the substrate. A waveguide enables you to set boundaries on two sides. These effects are available only when using the Momentum(microwave) simulation mode, and not (...)
1. Why we always need certain length (λ/2) of interface in a filter? Someone explained that such length is for eliminating high-order modes. But I don't quite comprehend how does this work, need more detail explanation from field or mode point of view. 2. Always have some confusion of resoante mode and tranmit (...)
Recently, I've read paper entitled by "Left-handed transmission characteristics of rectangular waveguide periodically loaded with ferrite", and I want to repeat the dispersion relation shown in fig.2, but I meet the chanllenge to solve the transcendental equation (5), which is deduced from the mode-matching method analysis. (...)
Question about the frequency domain solver. When I open up the Frequency domain solver parameters windows, where I can specify 'excitation settings' and such, there is a section called excitation where you can specify the excitation port and mode. I had been using floquet modes for a while, and the (...)
Im doing my final year project about SIW waveguide using CST..i want to find mode TE and TM in CST...plezz reply immidietly..thank you.
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They have to be connected to carry the commonly used H10 wave mode. Review the waveguide wall current distributions in a RF handbook.
Hi all friend, One problem put me on edge for a couple days. I am using CST to simulat ethe Coplanar waveguide. The basic on, dielectric material with constant 9.6 and 350um thickness, 70um copper, strip width 350um & gap 250 gap. input frequency 1-5G background material air, big waveguide port according to the instruction, ( i (...)
Hi everyone, I have following problem and I believe someone of you will help me. My task is to calculate resonant frequency of rectangular waveguide (operating with TE10 mode) utilizing FDFD method. I know that problem must be formulated as a eiegen value problem, where eigen values are resonant frequencies. I will be grateful (...)
Hi, I am trying to simulate using MEEP the propagation of symmetric plasmonic mode in 2D MDM waveguide. After few time units, the field seems to blow up for some unknown reason. The next thing I did was to add some adequate loss to my metal and that managed to contain things, at least so long as the simulation ran. Is there still some (...)
Assuming a cutoff freq of 150 MHz and a normalized waveguide (a=2b), you need a 1m x 0.5m waveguide for a TE10 mode (a bit large) Are you sure you want to use a waveguide for this freq? In a rectangular waveguide neither m nor m subindex can be 0 for TMmn modes
In general, the lowest order mode, (m + n = 1), is preferred. This is intentionally excited in the guide with a probe or loop at the point where the electric or the magnetic field is maximum. This is why there are a standard set of different sizes so that you can select the one for your frequency and it will have only one (...)
floquet mode using CST be more easy than HFSS you just choose unit cell boundry condition,and use your floquet mode it so easy,i already try it regards