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Hi there impedance,
you'll want your slots to be roughly have a wavelength and you'll want the distance seperating adjacent slots to be roughly have a guide wavelength. To get a good match, and thus minimize the power reflected back to the source, you will need to appropriately offset the...
Hi Frogger, unfortunately I don't know much about AutoCAD so I can't help you much there. Perhaps you already know this but I forgot to mention in my last post that the lengths of the slots should be about half a wavelength and the seperation between adjacent slots should be about half a guide...
Hello there frogger, the return loss (vswr or s11) is definetly a problem. You'll want a return loss better than 20dB or less than a 1.2 VSWR. To get this I suggest you divided your model into two parts. The first part being the waveguide with the slots and the second part being the transition...
If I understand you question correctly when you apply a radiation boundary to the 4 faces of your transmission line some power is lost due to unwanted radiation of the TL. When you don't added any radiation boundaries HFSS automatically assigns ground planes to the 4 faces and the power is...
To plot the TE01 mode rotate the TE10 mode by 90°. This is used a lot in satellite transmission because it enables you to carry double the information on the same bandwidth.
And for kohi TEM don't exist in waveguides.
antenna array gain
I wouldn't use the fillet to miter the bends, you should use the chamfer (right next to the fillet) you'll have to vary how much you need to chop off the bends and see which gives you the better return loss.
microstrip pach antenna array
I would suggest to keep the spacing between 0.6-0.9 lambda, once the spacing becomes a full wavelength or more grating lobes will appear. For the coporate feed I would design the t-junctions and impedance transformers on there own and then merge them togerther and...
microstrip transmission line calculator
hi there arthury, S11 will never be zero because no matter how well your ports are matched there will always be some small reflections and loss. Only mathematical equations will give you zero. Also make sure that your waveports are not renormalized, this...
hi abees, to orient the electric field in a waveport you must define an integration line (one of the options when defining a waveport). If you want the TM11 mode in your waveguide you must increase the number of modes to be excited at the waveport. You do this on the same tab when defining the...
Re: HFSS boundary
yes it will be a perfect E, you can review your boundary conditions before you simulate using the boundary solver command under the HFSS tab. A perfectly matched layer just means that the fields will be absorbed. It depends if you want the fields to be reflected back to your...
Re: HFSS boundary
By default if you don't assign a boundary HFSS will make it a perfect E boundary. This means that your antenna will be modeled as if it was placed inside a metallic box an opening at the top. You can create your own surrounding dieletric to imitate the ground that will cover...
circular waveguide rectangular transition
Hi mauloftin, I have done some circular to rectangular waveguide transitions. The usual way to go about it is to make some intermediate sections that have the shape of a hexangon. Usually three sections should do the trick, maybe even two. Then vary the...
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