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modes cylindrical waveguide
as is well known, a waveguide (take rectangular waveguide for example) is able to support several modes at a single frequency if this operating frequency is beyond the cutoff frequency of these modes.
Here my question is, what determines the very mode that exists in...
parallel plate waveguide cst
Is it possible to simulate the parallel-plate waveguide, with PEC on the top and bottom, waveport at the right and left? I'm wondering what boundary condition whould I specify for the faces on the front and back, since actually they are infinitly long. Did I...
Re: slow-wave factor
yes, transmission lines with periodically loaded C and L are one typical slow-wave structure.
in one paper i'm examining at the moment, it seems the "slow-wave factor" is used to described any wave-guiding structure (even, e.g a parralel plate waveguide filled with...
slow waves microwaves101
hi vfone,
thanks for your information!
according to its definition, the slow-wave factor also eaquals to β/k0, where β is the phase constant of the slow-wave structure and k0 is determined by the constitutive parameters of the media, and also eaquals to the index of...
i'm looking for some structures(or discontinuities) that can cause phase shift within a very short physical range.
would u pls kindly let me know if u have this experience?
thank you!
hi zhiweisim,
well, u know it's not easy to explain this with only a few words.
i suggest u examine the chapter that discribes antenna array(for ur questino, the basic two-element-array theory is enough) in any antenna textbook. it pays to do that and won't take much time.
good luck!
how to model a coaxial fed antenna with cst
hi zhiweisim,
i almost agree with shahid78.
at the initial step of our simulation, due to the limited discretization of the model, the results of the port (e.g Zc) may not be that accurate. personally, Zc between 45ohm and 55ohm(even 43 or 42ohm) is...
in CST, i successfully constructed my model and got resonable results.
the E field vector plot in "2D results" also gives a desired figure.
now i want a 2-D curve showing the E magnitude along a specifical line(e.g x axis). however, the results given by the Template Based Postprocessing is...
in the far field, the poynting vertor, rather than the E field, points towards the normal direction outwardly.
i'm sure it will be of help if u take a look at the farfiled analysis of a patch from a "two equivalent magnetic current source" point of view. most antenna textbooks have this content.
thank you for ur suggestion!
i'm now working on this 5/8 wavelength vertical monopole design, and i'll show here if i get the desired results.
Added after 58 minutes:
hi shahid78,
thanks for ur comment!
i show the radiation pattern at 1.92Ghz here (not at 1.8Ghz, i suppose u are interested in...
insert feed antenna probe feed antenna
hi zhiweisim,
when it comes to the physical size of the coax line, basically, it largely depends on the size of your antenna. It's not appropriate to use a very thick coax line to feed an antenna with compact size. In addition, I suggest you first contact...
patch antenna cst
That's not difficult. u may simply take a look at a example in CST, a four circular patch antenna array which are all fed by coaxial line from the bottom of the Ground Plane. The Tutorial.pdf gives every detail and the corresponding model could be found in "Examples".
good luck.
to shameemkabir:
usually i check the Z(impedance) plot to judge at which frequency the antenna is resonating. does the antenna have a resonance where the curve forms a knot in the smith chart? i shall check it again and show the smith chart here later.
to Shahid: i suppose it does resonate at...
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