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I don't know about this, but is it possible to increase (or shape) your beamwidth of the anti-podal Vivaldi by extending and shaping (maybe a semi-circle) your substrate well past the Vivaldi's aperture? Think of it as a 'radome' or 'WAIM' (I think it's called wide aperture impedance matching)...
Dear h_cet,
Sorry for the delay. This is what I meant:
https://obrazki.elektroda.pl/60_1187317882.gif
I still couldn't get over the part of your design not having a ground-plane. I don't know if this will work when you don't have a ground for your LumpedRLC 50 ohm boundary's other end. Do...
Dear SAJ25,
As spirals are pretty wideband, you will have to expect to use a wideband balun. For a two-arm spiral, I've seen people discussing about using a 100:1 coax wideband balun. The paper should be lying around the internet somewhere, do google or see if you could get a copy in this...
Dear h_cet,
For your situation, maybe what you can try is:
At the input end to your wire antenna, draw a coax and assign it as a waveport that you seem to know of.
At the termination end of your wire antenna, do a small break just before reaching the end of the wire. Then at the break, assign...
how to measure di-electric constant
To roderick81,
I don't really know if this idea is what you want, or in fact whether it will work at all.
But then maybe what you can do is etch away the copper cladding on your PCB, use two horn antennas connected to your network analyser with the bare...
bow-tie antenna hfss
To chamonz,
I've written something about the bow-tie antennas in other threads, but I won't mind re-iterating myself again! ;)
After reading your post, I sorta understood what you're trying to say. So, we shall just constrain ourselves to a bow-tie DIPOLE etched on a...
To ZengLei,
I don't know if this is helpful for what you want, but perhaps you can try this reference in IEEExplore:
"Folded unipole antennas
Leonhard, J.; Mattuck, R.; Pote, A.
Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988]
Volume 3, Issue 3, Jul 1955 Page(s): 111 - 116"...
Dear Jurbrian,
I concur some of the repliers are right. With that high power handling, plus you want it to be in an array in the end, it is wiser to use waveguides instead. These elements are well known to handle high power feeding.
Or maybe, something you can think about, micro-machined...
Dear Azulykit,
There is the rather common planar "volcano-smoke" PCB antenna that you can look into for starters. I am assuming here that you are trying to look at it as a simple transceiver first. It's a whole different ball-game if you're looking at a radar system point of view.
Its design...
Re: 50 ohm termination
tq,
the termination is "automatically" shown to you when you have to assign ports. else, it is already pre-assigned for you even if you'd forgotten to set your impedance/calibration lines.
sometimes it is better to try to read carefully through the pop-ups as you do...
Dear tjunqueira,
This is what I think I would answer to your queries:
(1) In my honest opinion, you have to choose your solution to be 'driven terminal' if you know your antenna is to be of wideband response (e.g. biconicals). 'Driven modal' is normally chosen if you know what modes that you...
To peter-gr,
You could be in luck! I believe the latest 3rd edition of Balanis' 'Antenna Theory' has updated his Fortran codes into MATLAB as well. Give it a shot!
Hope this helps,
Dave
To kkhtkkht,
I'm sure it's not the only solution, however you can...
(1) introduce 'cuts' onto your radiating patch
(2) introduce another 'image patch' fed with 180-degrees-out-of-phase to the main signal, like a dipole! ;)
Hope it helps.
Dave
To goodsunday,
I'm sure it's not the only solution, but unfortunately if you want a 30 - 400MHz 'small' wideband antenna, it has to be of wire structures (or its variants). You might like to try reading the recently published Doug Miron's 'Small Antenna Design' book. It'll give you a better...
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