Easy to Build WIFI 2 4GHz Yagi Antenna

This antenna w ill extend the range of your WiFi or 2.4GHz devices (like surveillance cameras) intomany miles and kilometers. A yagi antenna is basically a telescope for radio w aves. I tired thepringle can antenna and the Yagi beats it hands dow n in performance.

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Easy to Build WIFI 2.4GHz Yagi Antenna by Biotele (/member/Biotele/)

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This is an absolutely easy project.

You need an ink jet printer/ ComputerPopsicle sticksWhite glueCrazy glueBig paper clips (you could use any stiff solid metal w ire instead)USB WIFI, preferably w ith an antenna extension OR a 2.4 GHz devicesoldering iron and leadSanding papersScissorsPliers or preferably a nibbler (see photo below , available at radio shack)a metric ruler w ith millimeters or a metric caliper.

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Sep 21, 2013. 1:35 AM Reply (CFPF7NGHLSGSBH3)

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Saarducci (/member/Saarducci/) says:

Okay well I read through the entirepost and I saw many things thatmade a lot of sense, also saw a lot ofunnecessary flaming, but I do have afew comments to make. Right off thebat the one individual that askedabout having his modem in thebasement with a rotating antenna onthe roof needs a reality check.Overlooked in the connecting theUSB dongle to the antenna was thetransmission line length, for thesefrequencies it should be as short aspossible and a multiple of 1/2wavelength I'd suggest as close to2.41 inches as one could manage(use a small diameter 50 ohm coax).Take the dongle apart and connect aUSB extension cable to it and mountit directly on the antenna assembly.Paper clips vs copper, at thisfrequency it's not going to makemuch difference, however thespecific model was generated using14awg copper. Someone said glue itall to cardboard then cover it withmore cardboard actually a strong andstable design, original author saidbuild around popsicle sticks(wooden),both are subject to absorbingmoisture from the air and either canhave a poor dielectric constant, Iwould suggest some kind of plastic(they make popsicles with plasticsticks). The lengths of the elements,the spacing between them, andkeeping them all in the same planeand parallel to each other is the mostimportant consideration. The drivenelement, #2 in this design: that one Iwould make from 14awg copper, I'dmake a simple dipole rather than afolded dipole, I would take twopieces of wire make 90 degree bendsin them cut the bent part to about 1/8inch and attach my transmission line.Take a piece of heat shrink cut twonotches in it about 1/4 inch apart andinsert the wires into it and shrink it,maybe reinforce the space in thecenter (break a tooth from my comband stick it in the middle beforeheating the shrink?) cut it down to thecorrect overall length and insert itlast. If you use the folded dipolemake sure the folded part isperpendicular to the plane of the restof the antenna and use 300 ohm twinlead to connect to the dongle, butyour SWR will probably be muchhigher, reducing your effective gainand possibly resulting in early failureof the dongle. Horizontal vs vertical,after you have your antennaconnected and have connected tosome network you can try rotating itabout its horizontal axis to see if youcan get a better aspect on the otherantenna (more bars). All in all thoughgood job to Biotele, it's cheap, it'seasy, and if done right will provideexcellent results. I did not build this


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Apr 29, 2013. 9:43 AM Reply (C4WOF5THFPTELJN)

antenna, but I built 2 antennae very similar before reading this post, My son and I l ive almost2 miles apart and either of us can stream 1080p movies from the other's house during athunderstorm.

michi (/member/michi/) says:

Please provide better pictures, I can see absolutely nothing here...: Step 7: Connect theAntenna to the Wifi Modem, first picture. Which wire goes were?

michi (/member/michi/) says:

I did built this antenna, but it does not work. There is absolutely no gain. Instead it is worsethen before.It is also not clear how you need to solder the antenna to the board. One wire, two wires?

brian-kn (/member/brian-kn/) says:

Hi Having made the antenna how or what do i need to connect it to my laptop to increase theextra antenna power, Kind Regards Brian UK


Hi, I thank you very much for the reply about the antenna wiring it is more clear now that youhave explained, Kind Regards Brian UK


Hi can the wires from the yagi antenna be connected with the wires in a a usb connecter andconnect directly into my laptop. kind regards brian

popefelix (/member/popefelix/) in reply to brian-kn

If you mean just soldering aUSB connector on to thefeedline for this antenna, no,that won't work. You sti l l needsomething to handle theactual generation andreception of the wirelesssignal.

However, if you meanconnecting the antenna to aUSB wireless adaptor, that'spossible, provided you connectthe feedline from the antennato the antenna connector onthe wireless adaptor. If theadaptro doesn't have one,you'd have to tear it apart andfind where the internalantenna was connected.

popefelix (/member/popefelix/) says:

If you mean just soldering a USB connector on to the feedline for this antenna, no, that won'twork. You sti l l need something to handle the actual generation and reception of the wirelesssignal.

However, if you mean connecting the antenna to a USB wireless adaptor, that's possible,provided you connect the feedline from the antenna to the antenna connector on the wirelessadaptor. If the adaptro doesn't have one, you'd have to tear it apart and find where the


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internal antenna was connected.

sololife.sai (/member/sololife.sai/) says:

Can i use a wire if so what is thediameter. Thank you

Biotele (/member/Biotele/) (author) in reply to sololife.sai

Of course, it has to be stiffand solid. I don't think it hasto be exactly a certaindiameter. Maybe someonewith antenna theory canenlighten us further.

Dr.Bill (/member/Dr.Bill/) in reply to Biotele

I think a larger diameter wirewill result in a larger bandwithantenna.For a router with 2 antennas,why not build 2 yagi's and stackthem?A stacked phased array just l ikethe EME array's for moonbounce.

iamdarkyoshi (/member/iamdarkyoshi/) says:

I have a major problems that needssolving quick: how exactly do iconnect the driven element to theantenna? as you can see, the antennaboom is missing the element, becausei popped in my original antenna withthe usb card, and worked fine, but notthe strongest signal. why didnt it workwith the copper wire? because i justtook the 2 wires coming off my board,and put them on each end of theelement, completely skipping theoriginal antenna? how is the wiringdiagram? any help would be greatlyappreciated, as im bored of trying toget around the schools internet fi lter,with this i can mooch off of someoneelses:D

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estefan2020 (/member/estefan2020/) says:

here is a matching using a piece of coax to get the 300ohm down to 50ohm


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http://www.k7mem.com/Electronic_Notebook/antennas/yagi_vhf_feed.html


@kiranrpatil01 if your phone has anexternal wifi jack, or you plan onopening ypur phone and solderingsome lmr-400 cable to your phoneand have a 2ft antenna attached, gofor it.


here is an online yagi calc for 2.437ghz, gives more options

http://www.k7mem.com/Electronic_Notebook/antennas/yagi_vhf.html

chrislarkin (/member/chrislarkin/) says:

it did not work because you were completing the circuit at the end of the coaxial cablestopping the signal from traveling through your antena

estefan2020 (/member/estefan2020/) in reply to chrislarkin

if this was dc theory, yes, butthis is ac theory. the driverelement acts much like aloop. just l ike the old circleuhf antenna, this way iscalled a folded loop, whenthe folds are the samedistance. dc looks like ashort, ac does not.

estefan2020 (/member/estefan2020/) in reply to estefan2020

http://www.youtube.com/watch?v=BGdwIXMexCY&feature=rell ist&playnext=1&list=PLD7A103946CE9C072

here is another yagi foldedantenna with apropratematching cable for 50 ohms.

if you need a wifi withdetachable antenna, alfa onfleebay is a good choice


I would suggest ether placing glue onyour sticks and let it dry, or using plasticwrap around the sticks. this will preventmoisture from the wood interfiering withthe antenna.

kiranrpatil01 (/member/kiranrpatil01/) says:

is there any danger by using it ,l ike l icence for WiFi and can it be connected to android


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mobile to accessinternet?


for cable ebay 'rp-sma lmr 400' 3ft1mcable $13 this is the only thingyou don't want to skimp on, as it isfor these frequency's cable signalloss can eat up the gain.

you can get 'RP-SMA male flange'and connect your antenna to yourusb antenna adapters jack, andavoid the cable loss. just mount thedriver element so it hooks up at thebottom instead of the top.

.

frankortega (/member/frankortega/) says:

I found a company and there antennaare not too expensive, I try to buildtwo type of antenna in (easybuild2.4GHz), but sti l l lacking someimformation, and its end up lossingmy time, need more information,kindofcable,connector,and how longthe maximum leght of the cable.thanks

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jbaker22 (/member/jbaker22/) in reply to frankortega

I have a Cisco wrt120n. It has2 antenna how do I make theyagi antenna?

Biotele (/member/Biotele/) (author) in reply to frankortega

I don't understand yourquestion. You build thisantenna but you can't connectit to the usn wifi receiver? Canyou post a picture of what youbuild so far? Thanks.

jbaker22 (/member/jbaker22/) in reply to Biotele

This is router what other info.Do you need?


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It has 2 antena like thisshows. The metal partson the side are theantenna. I would l ike toattach an all igator clipto 1 antenna whichshould I clip it to?Then I wil l attach theother end to the Yagiantenna.

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nzammit (/member/nzammit/) says:

Hey great instructable! It might be a bit off topic but I have a few old disused TV antennas.Could I somehow change those to receiving WIFI? Thanks.

dbartley (/member/dbartley/) says:

Anyone with experience of reflections from the coax itself? I built a 4-element verticallypolarized 850-MHz Yagi antenna. With the coax dangling haphazardly from the boombehind, there seemed to be tremendous problems. These problems seem to disappear bylooping the coax behind from boom to the mast, forming ROUGHLY another half reflector.

dbartley (/member/dbartley/) in reply to dbartley

The ARRL Antenna Book(Chapter 27, 1991) describesthis problem of antennacurrents on the transmissionlines somewhat. The outsideof the coax is actually part ofthe antenna, being directlyattached to an active antennaelement, though it isperpendicular in this region.But also its metal further backinteracts inductively withother antenna elements in itsvicinity. Directing the coaxback along the boom, with alarge loop (about 1.5wavelengths) behind anddown to the wooden mastimproves receptionconsistency somewhat, ratherthan haphazard arrangement.But the ideal loop seems tobe obtained from the tightestpossible. Because of thepeculiar geometry and thelack of actual measurementrather than qualitativeevaluation, it's hard tounderstand why this is.


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jbaker22 (/member/jbaker22/) says:

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Biotele (/member/Biotele/) (author) in reply to jbaker22

you can use a 2.4 GHZ coaxcable with adapter hooked toyour router.


(removed by author orcommunity request)

Biotele (/member/Biotele/) (author) in reply to jbaker22

get a solid piece of copper wirethat fits into the router'santenna socket, and connect toone side of the dipole. Thewire should short.


It has no socket. I have tosolder and hope I don't ruinthe router.

frisbeechamp1983 (/member/frisbeechamp1983/) says:

If I added like a reflector to the backto send all waves forward, the put iton a slow rotation like radar, would itsti l l work? It would be attached to amodem in my basement,the wired tothe roof of my house.

andrew101 (/member/andrew101/) in reply to frisbeechamp1983

actually if you look at yagiantenna theory, the wire justbehind the driven wire actslike a reflector If you added adish behind the antenna,and the spacing was wrong,you would cause undueinterference for yourself, andchances are it would workagainst you.

a possibil ity would be to addsomething covering the backthat was grounded, it wouldact as a shield tointerference, and not areflector though.

Biotele (/member/Biotele/) (author) in reply to frisbeechamp1983

Yes that will work. Can you post a picture that sounds like a great idea.


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khan0daulatzai (/member/khan0daulatzai/) says:

guy can any paste a video of thistest,,,plzz

Computothought (/member/Computothought/) says:

Made your antenna, but have nottested it yet. have to rescue a cablefirst.

Biotele (/member/Biotele/) (author) in reply to Computothought

you don't need a cable atiny short wire between theactive strip on the board andone side of the loop willwork. Photo's please. thanks

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Easy to Build WIFI 2 4GHz Yagi Antenna