Modifying a 2 4 GHz dipole antenna to 5 GHz

[@jabbawok944]

I was just about to say the thing about the 2.4ghz 1/4 being near enough a 5ghz 1/2 wave length. It’s great to see someone backing up their reasoning with evidence. Nice work.

[@FourQ]

Thanks Andrew for this. I need some sacrificial 2.4GHz aerials. We're completely oversaturated with wifi in our area so a properly tuned radio might just give that extra performance we're looking for.

[@brititalia]

Allbeit late but Congrats. from an old timer...! glad the RF rules are still respected and observed...Thank you and 73!

[@trahim2]

Love these videos. I find all things RF fascinating.

[@ronparker6489]

Excellent video, "Bloke." lol I always enjoy watching/listening to folks with a "British" accent. I spent over two years in England during the early 60s in the USAF. Really appreciated the people there, especially the ladies. :) Keep up the good work! Ron

[@deanwade5611]

We don't have an "accent" - it's called "English"

[@Marc23zx]

@@deanwade5611 How to explain that those born in Argentina are also americans.

[@seavil17]

awesome video thank you! Can you make a video on how to Tune a dipole antenna with the decoupler/metal casing. I would really appreciate it thanks

[@Hoverbot1TV]

I'm going to be aking a pair of patch and biquads in 5.8ghz and your vids help a lot.

[@ruddyruff2729]

If u still have spares for the 5ghz antenna, do u mind selling 'em on ebay? I would buy them !

[@salat]

About the super exact measurements: The 5 GHz band is really wide (goes from ~5,1 to 5,7 GHz in EU - that's a wavelength difference of ~6mm), so that the exact length you measure is only valid for about one particular channel, right? I guess that was what the fellow ham wanted to get over. Just go for the middle :) Also, don't underestimate the influence of the sleeve material as it adds capacitance. We used some layers of simple heat shrink tubing to modify a 70cm band rubber antenna from 470 MHz to 435 MHz - that'll work on those little 5 GHz ones,too - also any hardware/wall/plant/whatever in the near proximity of the antenna might change it's resonance frequency. If you wanted another 500m range I'd rather use some stacked antenna version like you built before. Please excuse my English - it's a little rusty and may sound a little harsh (really not intended) :) Keep up the good work!

[@andrewmcneil]

"so that the exact length you measure is only valid for about one particular channel, right? Correct. The go for the middle is ok for 2.4GHz as it is smaller I tend to aim for channel 6. The screen shot in the video shows the difference in signal strength between a true 5GHz and a stock 2.4GHz. There is some difference there but if you lived in a small house it probably would not be a problem.

[@kenknerr7226]

Is there a difference in impedance matching between the two antennae?

[@MrTerrymiff]

I'd like to know whether your spectrum analyser/network tester reads out in volts or watts? If it is in watts then the difference between the two antennae is only about 0.4dB or 0.8dB if it reads in volts. Either way the gain seems, to me, to be nothing to write home about. Also, you did not appear to put any insulation between the tube and the braid back behind the solder joint. If you didn't then the tube would have no effect on the properties of the antenna w.r.t. just cutting the braid off and having no tube.

[@MACYNET323]

it's better use copper for antenna instead stainlesss?

[@derekblankmccoy]

Hi, whats a good place to buy the antennas from?

[@kavindugilshan]

How did you calculate 13.4mm ?? Please explain

[@andrewmcneil]

It is imposable to answer your question here in the comments. To understand this antenna and work out other frequencies you need a firm understanding of calculus. This is why you will not find an online calculator for this antenna or any other youtube video explaining the hertzian dipole in any great detail. On this channel I built an adjustable test rig for this antenna a few years ago and that is as far as you can go without calculus. There is a Wikipedia page on it but you will not get far without understanding the equations.

[@kavindugilshan]

I also read some articles about hertzian dipole . They all have heavy mathematics . Still little bit heavy for me . Anyway i learnt so many things about rf antennas from your youtube channel . Some videos i have watched more than 10 times . Everytime when i watch understand something new 😀 Thank you !!

[@PUNKSTER690]

How do you work out the length of the loading coil?

[@filozof71]

Hello, And what with dual band antennas? I have got Asus N66U router and would like to provide it with better antennas.

[@illfather7066]

Interesting.. thanks for the knowledge

[@MrOmiez]

Andrew it would be interesting to show how to make a dual-band antenna to use with routers that have simultaneous 2,4 and 5ghz like WDR-4300 Tp-Link. Can you make a tutorial for an antenna with 8db or more?

[@andrewmcneil]

That would be hard to do as it would work well in one band and not so good in the other. Early dual band routers used the same antennas for both bands. This resulted in good 2.4 but bad 5GHz signals. This is still the same for most laptops with dual band cards. I have looked at some patients for antennas though but most are PCB type.

[@MrOmiez]

Thank you for your answer Andrew. I am using 2 Tp-Link WDR4300 and on this model it seems they use dual-band antennas. Or am i wrong and this router uses PCB antennas for 5Ghz? A solution to have a better 5Ghz band in my case, if the router doesn´t have PCB antenna would be using one in only 2,4Ghz and the other in 5Ghz only with some nice antenna. If the router works with the antennas which one would you propose to use for 5Ghz? The first unit is in the center of my home which i would use with his stock antennas becouse they are covering good. the second unit is about 10 meters away at about 2 meters high. Thanks in advance.

[@aminkhan1292]

Hi Andrew, hope you are well, I was wondering if you can recommend cheap 5ghz only antenna, I'm modding a router that has existing 5ghz pcb antenna

[@TiengAnh.Online]

how can we help each other?

[@atrioxne]

does it work?

[@Cast3DAkademi]

i will try

[@shwegamecentershwegamecent9688]

silver.... antenna ?

[@robbrugman5815]

Please buy a analyzer To show what frequentie the mod ant really works Whit out blow your tx

[@andrewmcneil]

What's an analyser

[@djtahir7752]

Good job sir ...

[@christophreiser7789]

Hi Andrew, I am a Novis to Wifi and antennas and find your videos very informative and easy to understand. I need to extend my WIFI signal about 200m through several outbuildings, I guess two roofs from cement tiles and perhaps five standard brick walls. I am hesitant to put my antenna outside, as I live in a world highest lightning area, and am under the impression that a wet cement tile roof, prevents the lightning from hitting my equipment. I do have two CPE's (Airlive Airmax2 X 2) but only get a very poor link (inbuilt 10dBi patch antenna) on each unit. The CPE's have the option to connect an external Antennas with R-SMA connectors. What antenna would you recommend, and is there already an existing video on how its done? Thank you for your time and effort spent in attending to my inquiry Looking forward to your reply Regards Christoph

[@laroybafih]

Please make a wifi gun in 5ghz frek

[@olivrob2535]

hello, this antenna is not dipole! for a true dipole has no gain, and the two conductor elements have the same diameter! and the same length. what you show is an antenna has skirt and a self, which she has gain !!!

[@pwns4cash]

very nice!

[@darouachahmed1869]

Hey andrew i lost me antenna and i nedd one please send me one antenna

[@txm100]

ebay.com

[@darouachahmed1869]

No imean send me one

[@txm100]

Ok maybe get a brain first.

[@mikewoods1288]

this man isn't your parent and GET A DAMM JOB, AND ASKING A GROWN MAN WHILE BEING A GROWN MAN IS MESSED UP I DONT OR CANT EVEN IMAGINE HOW YOU DO THAT ASKING FOR A 2 DOLLAR ANTENNA FROM HIM

[@bennock1017]

These antenna are not Dipoles, they are colinear, phased verticals.

[@andrewmcneil]

No your wrong Ben they are hertzian dipoles. A collinear uses completely different math

[@bennock1017]

​@@andrewmcneil No, dipoles are symmetrical, as are doublets. This is a 1/4wave 30mm or so phased with a 1/2 wave or such. Still, you call it what you like.

[@andrewmcneil]

Again no they are 25mm / 25mm two ¼ wavelengths. It’s a capacitive design so instead of the normal 31.25 ¼ wavelength they work at a much shorter wavelength. The math: farside.ph.utexas.edu/teaching/em/lectures/node94.html More info here: en.wikipedia.org/wiki/Dipole_antenna#Hertzian_dipole And it is the most common wifi antenna on the planet

[@ecotts]

I found this interesting...

[@bibbidi_bobbidi_bacons]

Neat

[@Dark-uh6sc]

SPANISH????

[@charlescasmichelgerarrd9746]

FRENCH???? (Oh wait, I took the effort to actually LEARN L'anglaise)

[@sanjuparmar1438]

osmin w

[@atrioxne]

does it work?