Log Periodic Antenna 3G 4G LTE 850MHz to 2.7GHz

Log Periodic Antenna 3G 4G LTE 850 MHz to 2.7 GHz Gain 10/12 dBi
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[@acestudioscouk-Ace-G0ACE]

Thanks for making this, I had heard of log periodics but knew nothing about them, so your video was a real enlightenment.

[@stridermt2k]

That is beautiful! I really like the techniques you employed! These antennas can look really forbidding, but when I watch you break it down they are really quite accessible. Great work! 73 de N2NLQ

[@gammaleader96]

I would be interested to see the S11 response of the antenna without the impedance tab, might be interesting. Nice work, the antenna looks really clean while still being easy to build.

[@zulfiqaralich6136]

What a great professional and rebust built. It shall help me a lot to design mine one which I am planing to install at my form house in a remote area far from cellular singnal tower in Pakistan. Thanks for hard work and share.

[@erod435]

the antenna works great on 4G. used for a hunting camera. original antenna 2 bars, with this jagi antenna there is a full signal. thanks Andrew

[@SimonShaws]

Really nice build. Some great design ideas as well for working with aluminium which I always struggle with due to difficulties soldering it. Could the placement of the coax run also be influencing the build, right up the center looks much better than the Ebay design. I actually like working with brass. Holds its shape better than copper or aluminium. Has spring to it, if you knock something it tends to flex rather than bend. And you can solder it.

[@stevemacbr]

@Andrew McNeil - time line 17:13 showing the finished boom assembly. - Perhaps I'm wrong,... but are the TWO final 90mm long tubes TOP & BOTTOM - not on the WRONG side of each boom ??? ( i.e the TOP progression from front to rear - shortest to longest, left - right, left - -right, left- -right, left - right ,... shouldn't the last 90mm = LEFT ?? and opposite for the bottom boom ??? ) . .

[@aligharachorloo5781]

Thanks for your wonderful video. Would you please explain the functionality of that impedance tab (?) or dipole balun at the low frequency side of the antenna a little bit more ? Where exactly should it be and what is the optimum shape and size of it ? Regards.

[@mikenr]

Many thanks for the video - I would like to build one of these - can you tell me where I can find the tubing and what coax ought to be used? Thanks again!!!

[@Muck-qy2oo]

Great work, looks very professional. I would like to know if the dipole elements can have smaller spaces in between them, if one wants more elements on less place. Or does it always need to have enough spacing for resonance?

[@scottdol2099]

great vid as usual, but didn't see how you attach the coax to Al

[@jakedillingham]

Hey Andrew, question. If you have used a different gauge of aluminium on the boom and for the elements wouldn’t that change the impedance characteristics of the antenna? If so, how to you go about checking it's match?

[@ghlscitel6714]

If you use alcohol (C2H5-OH) as cutting agent/lubricant the threads will come out much cleaner.

[@FirstLast-jf9on]

Hey Andrew, I just want to ask if which is better: Log periodic antenna or Yagi antenna.? Thanks. By the way, I'm 4 to 5 kilometers away from the cell tower.

[@yahmk3978]

Thank you!

[@MrFrobbo]

Would repeating the shorter lengths and spacing increase gain for the 1.8 to 2.1GHz (B3 and B1)? Might give this a go as not interested in B20 as it's simply not fast enough (2Mbs).

[@djtahir7752]

Good job sir ...

[@openbabel]

can I use an old UHF tv similar ariel by adjusting the lenght of the dipoles to 23 mm to acheive 4g and 5G LTE reception?

[@khalifamohsin7]

Thank you so much for the video I have questions sir is it cut the dipole half off full dipole in log periodic antenna please sajest mee thank you

[@noahswarz4914]

​ @andrew mcneil I know it's been a while but could you confirm the dimension for the impedance tab? you have 135mm by 25mm, it doesn't match the rest of your dimensions, looks more like 35x15? Thank you

[@reza80]

Hi Andrew. Thank you so much for this video. I'm trying to make one of these antenna. I couldn't understand that how we going to make the tip of antenna? So two aluminum bars are isolated from each other and joined at the end? What happens to the coaxial wire because it's only one wire and one string. How did you connect it to both of aluminum bars? I got a little worry to make something which might hurt my router cause i remember you said about it in wifi gun video.. if they are not isolated, it can hurt WiFi card... I need help. Please explain about it Thanks again 🙏

[@bgfelagund]

Hi, did you find the answer elsewhere? I came here to ask the same (for isolation). In other antennas I see both bars are isolated from each other (bracket plate side) whilst in the front they connect inner coax to top bar and grounding to bottom bar. Then a lightning arrester to the plug.

[@0MikeG]

I started building one... actually two for MIMO. Similar materials but my 6mm aluminum rod has won't hold a M4 screw by I managed to tap with M5. There is less variety in shorter (10-16mm) M5 screws with small heads found something suitable nearby.

[@maukaman]

How’d the antenna turn out? Thinking of building a couple myself.

[@0MikeG]

@@maukaman All the bits are still in the box… it’s been a crazy year.

[@maukaman]

@@0MikeG yeah I feel ya on that! Do you mean you cut the pieces to length but never assembled? Was just wondering if it’s worth the time to build. May still be but time is hard to set aside for stuff like this

[@orijuelalouisamarie2661]

Good day, Sir! Do you have a visualization of the radiation pattern of this antenna? Thank you!

[@seyisland]

Just curious: Why 850Mhz instead of 800Mhz? I am asking this because band 20 is between 790 MHz to 870 MHz right? Thanks for your instructionals videos

[@samadm9646]

the length and width of matching piece is not clear , and also the position distance (coordinates ) ,please reply to this inquiry

[@shawntilton9170]

After I make the antenna, what am I supposed to hook it up with? I bought a cellphone antenna booster, from US Cellular, because it is still the best service where I live. Everyone else with other big name brands, don't get a single at all, at my house. The antenna connects to the indoor booster. Is it ok to hook up to this, or is there something better? I'm assuming that it's signal is only for US Cellular. However, I could be wrong.

[@bernardolorenzini8153]

Hi there. What is the distance between the two booms of this antenna project?

[@jeffryrubaya2856]

Can I recreate this using thin copper wires? What is the alternative material to create this?

[@hasanhoseiny7347]

Hi andrew; I want to build an outdoor FDD TDD Reinforcement antenna for Huawei Modem B612S-25D 600mhz-3600mhz . Which video do you get help؟ tnx

[@erod435]

Very nicely presented video. Can I use a support bar made of aluminum 1x1cm, and the elements aluminum fi 5mm?

[@andrewmcneil]

You can

[@erod435]

@@andrewmcneil I'm going to work on the antenna. I need a 4G LTE 1800mhz for a hunting camera. I hope it will strengthen the signal.

[@dodi073]

Hello ! Let me ask you, what is the distance between the 2 machines?

[@razblack]

Is the ground on the top or bottom bar? i couldn't quite tell.

[@atomicant4511]

This antenna will work for Huawei B535-232 4g on Three network

[@luiscoelho6985]

very nice

[@imek8892]

Why you put the first two elements at the top? you didn't make one over one under one over one under..... Why?

[@alimekkaoui3713]

Question Isn't there a short circuit? I mean you have insulated the two aluminium bars from each others but in the end you connected them together in the same aluminium sheet ?

[@kevinrtres]

Interesting impedance changes happen when different frequencies are encountered. That's why the antenna works - each set of wavelength tuned stubs creates a resonance around them at the frequency they've tuned at - changing the impedance the co-ax will see.

[@dineshvenkatachalam3764]

Where can we get the carbon copy of the antenna design?

[@Paulman50]

That's an easy build, just what I'm after thanks.

[@andrewmcneil]

No problem

[@mohdshakif1602]

Where you connect wire

[@w2q2r]

My LPDA ANTENNA DOES NOT HAVE ANY IMPEDANCE CAB, COULD THAT BE A REASON FOR NOT WORKING PROPERLY?

[@rajeshcr9800]

My lpda antena stopped working suddenly when I trying to find out signal why..?

[@jml5926]

How about making a log periodic with sleeve monopole elements? Or an LPDA with dual band elements.

[@andrewmcneil]

And it is ideas like these why I make videos

[@alexnolasco4660]

Can I use this antenna in wemos d1 pro?

[@truthpopup]

For wideband use, the log periodic is far better than a yagi, which is an inherently narrowband antenna. It isn't just about gain. If designed properly, a log periodic can have low SWR across its entire range, whereas the SWR of a yagi in a wideband application is all over the place.

[@MrFrobbo]

What's the difference between LP and Yagi out of interest?

[@truthpopup]

@@MrFrobbo You can learn a lot by googling the topic, but in brief, the LP is an array of diploes, each one tuned to one of many frequencies in the band of interest. The elements are connected by transmission lines. A yagi has one dipole and many parasitic elements, all tuned to the same frequency. Cutting the elements to resonate at different frequencies results in an antenna that is poorly-tuned for any one frequency.

[@maukaman]

That was an expert level response there! Explaining radio science to layman is no easy task but you painted a picture in a couple sentences there. 👍@@truthpopup

[@vishmithalanka]

how get dimension for 2.4GHz LPDA antenna?

[@andrewshudson]

Hi Andrew. Great video. Thank you. In the video you mention a PDF, but you do not mention where this can be located and/or downloaded? Could you please let me know where I can find the PDF for this project. Thanks in anticipation. (another) Andrew.

[@andrewshudson]

OK found the PDF. New iPad seems to hide info until you look hard,!

[@Watchyn_Yarwood]

Could you further elaborate on the impedance tab? It's purpose, dimensions, size in relationship to the frequency, etc?

[@Munkfish-TV]

I'm interested to find out about this too.

[@biglonniegruhn]

I’m also interested as the dimensions aren’t listed in the pdf file

[@siplekgiovani9518]

@andrew mcneil whether the coax cable that is soldered separately will eventually connect because it uses an aluminum bar on the back, please reply or help answer

[@STE41k]

The wire attach separately at the tip and the signal meets at the back where it connects. He mentions this in the previous video where he opens a commercial made Log-periodic antenna.

[@siplekgiovani9518]

@@STE41k thank you for your answer

[@jayatechno9752]

Good 👍👍 Indonesia hadir

[@alexlubaytv9892]

You have 32dbi can I buy sir

[@muadalmashareh7621]

Thanks for this awesome video, I have only one problem that stops me from going on is that I could not find 50 ohms coax cable in my country only 75 are available, dose it work?

[@andrewmcneil]

No 75ohms will have a detrimental affect on performance

[@muadalmashareh7621]

@@andrewmcneil is there a way to bridge or make a balun, or even hacking a cable? Your reply is extremely appreciated

[@beansfoundhere]

I would assume that by using round tubing instead of flat steel, you have increased your "skin in the game" I believe they call it, and with that your bandwidth.

[@andrewmcneil]

I was thinking the same more surface area due to the skin effect

[@siplekgiovani9518]

@@andrewmcneil whether the coax cable that is soldered separately will eventually connect because it uses an aluminum bar on the back, please reply or help answer

[@stevemacbr]

@@andrewmcneil - time line 17:13 showing the finished boom assembly. - Perhaps I'm wrong,... but are the TWO final 90mm long tubes TOP & BOTTOM - not on the WRONG side of each boom ??? ( i.e the TOP progression from front to rear - shortest to longest, left - right, left - right, left -right, left - right ,... shouldn't the last 90mm = LEFT ?? and opposite for the bottom boom ??? )

[@tier009gaming5]

sir i want to know which is better yagi or cantenna.please

[@andrewmcneil]

That all depends on what you want to use it for every antenna has its strengths and weaknesses

[@Watchyn_Yarwood]

Tube cutter amzn.to/2J2AXMO If you mount the antenna outside, put a dab of epoxy in the open ends of the elements to keep water and bugs out.

[@Munkfish-TV]

I've ordered up the parts for this build and also some PVC caps for the elements, will look nice and was only a few pounds for 100

[@Watchyn_Yarwood]

@@Munkfish-TV 👍

[@pointman028]

Cracker antenna. Cheers for sharing.

[@bibhutibal5617]

Hi I have try and make it work

[@claudiocastellikurageart]

Thank You! would this antenna have a 10/12 dBi?

[@andrewmcneil]

Yes or could be a little more

[@user93237]

No. The gain will be around 5-7 dBi.

[@claudiocastellikurageart]

@@andrewmcneil I was thinking building something bigger.. Accordingly to the online calculator, a very similar design to this should have a smaller gain. I'm very ignorant regarding this kind of technology.. is there something I'm missing? The measures from the calculator seems extremely similar to these... **** Logarithmic Periodic Dipole Antenna **** www.changpuak.ch/electronics/lpda.php JavaScript Version 12.01.2014, based on ARRL ANTENNA BOOK, 17th ED. ------------------------------------------------------------------------------ Min. Frequency : 800 MHz Max. Frequency : 2600 MHz Boomlength : 288.0 mm Gain : 7.18 dB Elements : 11 tau : 0.835 sigma : 0.152 ------------------------------------------------------------------------------ Bandwidth (active region) : 1.87 Bandwidth (structural) : 6.09 Bandwidth (effective) : 3.25 ------------------------------------------------------------------------------ Element 1, Rod : 93.8 mm, Position : 0.0 mm, Diameter : 1.9 mm Element 2, Rod : 78.3 mm, Position : 56.9 mm, Diameter : 1.6 mm Element 3, Rod : 65.3 mm, Position : 104.5 mm, Diameter : 1.3 mm Element 4, Rod : 54.5 mm, Position : 144.2 mm, Diameter : 1.1 mm Element 5, Rod : 45.5 mm, Position : 177.3 mm, Diameter : 0.9 mm Element 6, Rod : 38.0 mm, Position : 204.9 mm, Diameter : 0.8 mm Element 7, Rod : 31.7 mm, Position : 228.0 mm, Diameter : 0.6 mm Element 8, Rod : 26.5 mm, Position : 247.3 mm, Diameter : 0.5 mm Element 9, Rod : 22.1 mm, Position : 263.4 mm, Diameter : 0.4 mm Element 10, Rod : 18.5 mm, Position : 276.8 mm, Diameter : 0.4 mm Element 11, Rod : 15.4 mm, Position : 288.0 mm, Diameter : 0.3 mm ------------------------------------------------------------------------------

[@SimonShaws]

I doubt it. Log periodics have reasonable gain but a Yagi would have more. The main benefit of log periodic is wider usable bandwidth than a Yagi. A Yagi has a smaller bandwidth but increased gain. As Andrew says, its basically stacked dipoles.

[@SimonShaws]

@@user93237 where is he selling this antenna? The only one i can see is the Cantenna which is different.

[@suwalalmeena]

i like and iam making properly info to indian person.

[@djo7831]

Nice

[@andrewmcneil]

You should have said first LOL

[@djo7831]

@@andrewmcneil you did it so next time lol

[@omiga191]

Why do we find excitement between the cause and the obligation of my alpha

[@razblack]

which material is better for an antenna and also for a reflector? aluminum or copper?

[@SimonShaws]

Copper is best, or silver, better. For obvious reasons a silver antenna is impractical. Aluminium and brass also good. Copper corrodes and can be too soft. Most people use Aluminium or brass. Steel works but its conductivity is lower and unless stainless, rusts.

[@SimonShaws]

@Luiz Gonçalves Some good points. I'm always scared to paint mine or epoxy them due to it altering electrical length. Any tips on this? Brass and aluminium together look cool :)

[@razblack]

@Luiz Gonçalves wow, thank you for that information! I love the internet sometimes. Would it be best to use an acrylic spray or enamel? or would it make much difference, .. i'm asking cause i'm budget minded, and Krylon is cheap ;)

[@razblack]

uh.. just read this :( "Hello. All of our paints could possibly contain trace metals as this could occur during production. We do not recommend any of our products for an application that conducts electricity. Regards, Krylon Customer Support"

[@SimonShaws]

@@razblack Yeah I would ignore that, it's still not going to be conductive. Most paint uses TiO2 which although a metal oxide, is basically non conductive.

[@bpm74]

What is the impedance tab do?? What happens without it??

[@andrewmcneil]

You have high VSWR

[@bpm74]

@@andrewmcneil How to calculate this , I am building an LPDA , out of 9.4 mm brass tube and 4mm copper rods.

[@noahswarz4914]

​@@andrewmcneil I know it's been a while but could you confirm the dimension for the impedance tab? you have 135mm by 25mm, it doesn't match the rest of your dimensions, looks more like 35x15? Thank you

[@andrewmcneil]

@@noahswarz4914 It is 35mm x 15mm

[@danielr.schafer9504]

very interesting, ... but Im very green, as in new to this, is there a diagram as to the way the signal is acheaved? some sort of something like a wirering diagram?

[@SimonShaws]

Unsure what you mean, the antenna attaches to whatever device you wish to use with it via the coaxial cable feed.

[@aldos.308]

Hi, I’m from Brasil 🇧🇷. Do you have antena for 700 MHZ like this? Thanks

[@maukaman]

You can make a good antenna for 700mhz using an old UHF TV antenna! That’s what I’ve been using, works great!

[@aldos.308]

@@maukaman thanks man ✅

[@chessdachaska915]

Can u make an antenna of 868mhz? Thanks.

[@andrewmcneil]

What do you want to use it for?

[@chessdachaska915]

For a helium miner, yagi or collinear one? Thank you

[@andrewmcneil]

@@chessdachaska915 Ok leave it with me

[@chessdachaska915]

Thanks.

[@Abdullah-dv5lv]

Why white people have so much knowledge

[@samadm9646]

the length and width of matching piece is not clear , and also the position distance (coordinates ) ,please reply to this inquiry