Yagi Prototyping What have we learned? 

Please feel free to ask any questions that I have not answered. Although it is fair to say I still have questions myself but that is why I love this subject!

Hey Andrew love your videos and have made a number of your ants. Also modified frequency for my needs. Great work. In relation to the shift in frequency with to additional length, if I remember my lessons on wave guid theory, some decades ago now. It may have something to do with the inner diameter and the mode of propagation with in a wave guide. I could be wrong but worth a thought for you and any one more learners than I. But I am very interested in you experiments. It keeping my brain very active. Great content and look forward to more. Richard.

this remembers me years ago when i was setup a 5 element yagi for the HF spectrum on a flat roof; the distance above the roof did make a lot , indeed swifting the center freq for best SWR, i needed hours to get it right. My idea for the Cantenna is not cut down a working wifi antenna but change the diameter size of the tube....

Very nice experiment. Neil, what you call capacitance, can also be internal wave resonance. It is over 50 years I got a few lessons on Technical University Eindhoven. But until 10 years ago it did not interest me so much. Go on please 🙂👏

These are very interesting insights. Thank You for making all your innovative experiments and videos. 1. I am not so much into microwave stuff, but I think in general most of my HAM experience in UHF applies here too. So I totally aggree, most of the frequency shift in the pipe must be caused by adding capacitance to the arrangement. We know that a so called capacity hat lengthens a wire antenna electrically, making its resonant frequency shift down. Should be the same here, I guess. 2. I think you needn‘t care too much when there are low return loss ‚spikes‘, as you call them, as long as your transmitted signal is ‚clean‘ enough to not hit these spots.

Excellent experiment! Andrew could you go back and compare your bifiliar antenna from 8 years ago against your biquad antenna from 5y ago? You never had a spectrum analyzer and I would like to see these 2 omnidirectional antennas pitted against each other !! Thank you!

`scratching my head` count - 173

Really enjoyed this many thanks

Andrew, I love your videos. Have you considered a circular patch as the DE for the waveguide? That might decrease the capacitive coupling by not having corners so near the waveguide walls. I also have a feeling it might decrease the Q a bit and broaden the bandwidth.

it is close to SWR DISCLOSURE type of video which some of your subscribers requested before (:

Hi Andrew, thank you very much for all your superb videos! I watched a lot of them, but i am still unsure which antenna type is best to use as a wifi "sniper". Is it the Patch fed Yagi (cantenna?), Biquad Yagi (cantenna?) or else? The mk2 is too huge for me :D Thank you!

Cool. Have you tried just forward angle parasitic reflection plates / rods on the sides to make it more directional? Or under and above it. Closed sylinder will have static charge around it. Anything over half a ball / tube will have positive charge on the surface and negative charge inside.

I always have questions that i didnt before. Most of them are probably fundamental mistakes new people make. But i really want to know what you think about AI in somehow aiding design? Do you think it would hinder results or speed them up, maybe ai will see things we might not? I first encountered developmental design watching the americas cup as a kid. And the behind the scenes of team new zealand. It just interests me watching things improve.

Have you done any kind of software modelling of the cantenna style yagis? I'm interested to see if they have superior gain or f/b patterns compared to a standard yagi

Great video with nice explanations. The only question I have got is, why have you chosen the 2.4 wifi frequency ? Where on a typical wifi range for internet access (house + garden + shed...) It is rather simple to use cables and add AP. Is it more relevant to work on mobile internet access for mobilehomes or isolated homes ? I don't know 😁 you have probably good reasons 😁

line the inside of tube with ceramic or some dielectric to decrease capacitance?

Layman here: I get that the increased capacitance throwing off the frequency and that's bad, but are there any advantages to having a larger driven element?

Hey, could you or someone from the community point me towards your latest video about diy cantennas? I saw the one from 8 years ago, but not owning test equipment of my own i'm afraid to damage the wireless adapter if the antenna has an high SWR.< Thanks

Hi andrew i was working on making 698-6000mhz log periodic dipole antenna with 11+1dbi gain my calculation in the end is not accurate for as per the testing results last dip stuck around 3800mhz, Can you get around making this antenna ? and maybe your previous aluminum tube lpda antenna can be modified with some calculation to target max 6000 mhz a great 4g5g lpda antenna video can be done on this too !!