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I recently set up a group
https://groups.io/g/antenna-research
The group was set up to provide a forum for discussion of moderately advanced to advanced antenna research. Typically this will mean from undergraduate research projects in universities to more advanced topics.
Here's a Wiki...
As
An RF engineer, who specializes in the design of VNA cal kits (https://www.kirkbymicrowave.co.uk/)
A company director
I can see why a CEO would question what is required, and what is not. That seems good business sense to me. The CEO should also budget for a cal kit and phase stable...
I wanted to reply to this thread
https://www.edaboard.com/showthread.php?140944-VNA-accuracy-without-a-calibration-kit
but it is closed, so I can't. I don't really see the point in closing threads, since if someone can add something useful, even years later, why not let it be added...
FWIW, the book Antenna Theory, 3rd edition, by Constantine A. Balanis, givens in equation 5.14-a for the radiation resistance Rr of a loop as
Rr = 20 π2 (C/λ)4N2 Ω
where λ is the wavelength, C is the circumference, N the number of turns. Sticking that in, for λ=2.08 m, diameter=225 mm, N=1...
I want this horizontally polarized. A horizontal dipole has two nulls.
A small loop, with a circumference << λ has a virtually constant current, so the pattern is close to symmetrical. One book I have says < 0.016 λ, but I've no idea what that number comes from. That does lead to unacceptably...
I did wonder if the balance/unbalance issue. I'm not convinced that is the case though.
This loop is totally closed, rather than have a gap in the middle. You are thinking of something quite different when you say 150 Ω.
I want to make an omnidirectional pattern. I think this means the loop...
Re: Why is this HFSS model NOT showing similar results to VNA?
Somehow I stuck the title wrong. The model is NOT showing results like the VNA is measuring
I tried to create a loop antenna, consisting of a single closed loop for 144.3 MHz. I wanted to set the diameter so the real part of the input impedance was 50 Ohms, and then tune out the inductive part with a capacitor. So I set up this HFSS model, and found a radius for the loop where the...
I believe you misunderstood me - note I mentioned the word "torus"
https://en.wikipedia.org/wiki/Torus
I want a loop like a torus, but with a gap - see image. I'm looking for something to fabricate out of copper pipe, not something on a PCB.
I simulated that with a circumference of 1.0 m...
I want to model a loop antenna, but are not sure how to draw the loop. I have seen this done in the past, and if I recall correctly, a circle is drawn, and then that swept along a arc. But I can't seem to find out / recall how to do it.
I did think of drawing a torus, then chopping a bit out...
Why two lumped ports? Why is one not sufficient? I found this answer
https://www.edaboard.com/threads/227831/
to a somewhat similar problem, answered by tallface65, who seems an HFSS guru. He only used one lumped port. That was two square capacitor plate. I've changed this to a geometry which...
I've put some background information to my problem. If you don't want to read that, just skip the section marked "Background" and go directly to the section marked "HFSS problem".
Background.
I purchased cheaply an HP 16453A Dielectric Material Test Fixture. A picture of which is shown.
It...
As someone commented a link budget analysis would be useful. But I suspect that you don't know what the transmitter power is or what is the minimum signal to noise ratio needed. So that is almost vertainly impractical.
An axial mode helical antenna is worth thinking about. They are easy to...
Just a few comments, based on the many interesting replies. There are too many to make it practical to comment on each individually, so here is a summary.
1) Yes I had considered using Droitwich @ 198 kHz, and might well do that, although according to Wikipedia, it use a rubidium frequency...
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