5GHz Cantenna Part Two Shows why the Can Diameter is so Important
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- เผยแพร่เมื่อ 18 ต.ค. 2024
- Testing to see how a larger diameter can affect the performance of a 5 GHz cantenna
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Not quite the outcome I was expecting but still interesting. And if someone asks in the future if they can use a larger diameter I now know the answer.
Just for information: based on this link (mbharris.co.uk/articles/antenna/waveguide/#calculator):
Lower/Upper cutoff @ 53 mm ID = 3315.628/4331.134 MHz
Lower/Upper cutoff @ 40 mm ID = 4393.207/5738.753 MHz (5 GHz is in the middle)
So around 40 mm ID cantenna would be the optimum.
I wonder how much the position of the element is important vs the dimension of the resonant cavity.
What about mounting a driven element on a micrometer adjustment ? With a slot on those cantenna, it would be interesting to see if they can be tuned on the spectrometer.
I know this is kind of a stupid question, but how does these two compare in terms of transmission? Does the diameter make a big difference when broadcasting the frequency vs. recieving it. This is especially important for wifi 6 as it uses both 2.4 and 5 Ghz simultaneously.
Can you combine these with a satellite dish and give it another go? I'd really like to see the results, I have a hardware store cross from my house and an old Sat Dish..
Interesting work. The waveguides I worked with have always been rectangular. Do you think a proper waveguide shape would offer any improvement, at least with polarization?
hi you seem to be the most informative youtuber on here ,so thought you may be able to help quite new to this radio scanning ,and just bought a Watson SDRX1 100KHz-2GHz Ultra Wideband SDR Receiver for my laoptop ,just wondering if you have built a desktop Arial suitable for wideband receiving in the 100khz to 2ghz range ,if not any recommendations?
Can I use a 3" PVC pipe wrapped outside with heavy alluminium foil to make a Cantenna?
My concern, as the conductor wrapped outside an insulator, won't it effect the antenna performance or gain?
I'm trying to make a 2300 MHz LTE antenna, so the diameter is within the cut off frequency range.
Anyone with proper knowledge, please consider answering this question.
Did you try it?
@andrew mcnell: Are you sure the better behaviour is related to the diameter and not the positioning of the active element from the "Reflector"? That should be in resonance as well to get optimum output power, right? And on first glance I'd say your feeding point at your black design is completely at another position than that of your blue one. And even more I'd expect not too much of a difference caused by the diameter if all *other* dimensions (feeding point from bottom, length of the active element) stay exactly the same as long as there will be enough room for about 1.6 to maximum double the wavelength of your signal.
I've chosen double wavelength in vacuum intentionally as you wanted to separate from 2.4 GHz and that would be blocked out if you do see the "tube" as an wave guide construction but everything bigger than the minimum diameter should work fine with about the same loss, no?
Do you still sell these ? I want a 5ghz one
Hi Andrew thank you for the video.
Heres a question. What would happen if a cantenna like one of these was built, but with both ends open? Could you get a directional antenna in two directions or would it not work that way? Ofcourse i appreciate the gain would be less, but still, does anyone know?
Cheers !
It is indeed a thing you would get a pattern similar to a discone antenna on its side also slot antennas (waveguide family) do this also
@@andrewmcneilAwesome cheers ill look into it.
thank you for getting back to me!
Great video as usual, Android boxes are very popular now but wifi can be an issue on them as you cant use a dongle on them for obvious reasons but could you do some kind of mod on one as i think it could be a popular video? Pardon my lack of knowledge if this is a daft question
I could but have not used one myself for some time. What is the popular models people are using these days?
There are quite a few models on the market and seems like most households have 1 nowadays. I've seen a few forums discussing WiFi issues and thought it could be something else for you to look at as your videos on modding routers are great! Great to see you back doing video's again Andrew :-)
It would be really cool to make a variable length and diameter cantenna and try a range of dimensions. :)
I am going to make a telescopic cantenna but I can't see a way of making one with variable diameter though
Thanks!
hi sir,is there any antenna design for offset dish feeder?
can use the cantenna with parabolic dish Answer me, please. I trust you.
Yes but a shorter one
@@andrewmcneil thank you ❤🙏🏼
How much can I buy a 2.4 Ghz cantenna from you for Andrew?
There will be amazon shop soon
I will definitely be on the look out, thank you sir. You sure know your stuff and I admire your knowledge of radio frequencies. You're videos are awesome and I would love to own one of your antennas for my Alfa AWUS036NHA.
Agree with you Andrew. Can you compare router with 3 antennas like ac68u and maybe hook up to two 2.4ghz yagis and one 5.4 yagi and compare with that splitter. Is gain with 3 antenna router only +3dbi per additional antenna
There is a lot of information about antenna stacking in the ham radio community. The maximum gain by stacking two antennas is 3db, with optimal distance between antennas, every time you want an other 3db you have to Doble the antennas, so 2 antennas is 3db 4 antennas are 6db ower a single antenna. This everything is a cost off sharper radiation path. The same role off thumb goes with yagi antenna after the first 3 elements, you always have to Doble the amount of elements to gain 3db
Have a look at this dish feed for 5GHz
www.antennas-amplifiers.com/feed-Illuminator-satellite-offset-dish-fd-0.5-0.8
www.dropbox.com/s/u6w6wspshvd5qh7/800px-PCB_dish_feed.JPG?dl=1
www.dropbox.com/s/mjbad1ixkennm66/800px-PCB_dish_feed2.JPG?dl=1
ALSO
What is the Frequency Bandwidth of your Blue 5GHz cantenna
Do you think you could make one of the above dish feeds using copper tape on perspex?
I dont own one of those feeds but I am thinking of purchasing one, I wonder if you have any comments on the design etc they cost 20Euros
Here's an idea for a future build. I did this (www.reddit.com/r/techsupportmacgyver/comments/6pp2l5/4g_wasnt_very_good_so_used_a_old_dish/) with a mobile phone and a satellite dish to improve my signal recently, is there any way to improve on it.
I have to say I did like that and it would work until you picked it up to answer it
andrew mcneil lol it's a spare phone with a separate contact. So it will not be picked up