Omnidirectional Biquad Antenna for 2 4GHz
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- เผยแพร่เมื่อ 26 ส.ค. 2024
- Directional antennas do have their strengths such as power over distance but sometimes you may need to use a good omnidirectional antenna to produce 360 degrees of coverage over a smaller area.
So this video is a different take on the traditional biquad antenna and I will show you how to make an omnidirectional biquad for 2.4 GHz.
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Very impressive! I made one and attached to a short range/cheap 2.4 hk receiver that normally drops off within a park while maneuvering. The range is unbelievable (way beyond visual) regardless of attitude/orientation... further than my long range "high quality" receivers...thank you for the contribution! I removed the receiver case and soldered directly to the small board to keep weight down.
Wow, these work pretty good. I made one for one of my ESP8266 WiFi modules and get around a 23dB improvement over the ceramic chip antenna on the board.
I used some copper clad steel wire from an rg-6 cable to make the antenna.
Wow 23db ? How did you calculate that ?? Using an equation made by aliens ??
Very cool! I'm looking to modify this for the 915Mhz ISM space for use with LoRA. There's not a lot of construction videos out there for omnis with this type of antenna, so this was a very valuable video for me. Thank you!
having that metal thing 31.5mm is not right. adding a wire itself from both sides makes the antenna side ~33.5mm and that is the setting for ~2200MHz. So, to have it tuned for WiFi frequency, the internal length should be ~28.5mm. Adding wire from both sides makes it 30.5mm (L/4) that corresponds to WiFi middle freq 2450MHz. A lot of people tried to reproduce your variant and they figured out that the gain is not like expected exactly because of the wrong length. 31.5 internal - is wrong for WiFI; 28.5 internal - is right. Hope this correction helps to build a better antenna for other people.
So it won't work if 31.5mm is considered?
I just followed your tutorial here and have to say THANK YOU!. I've been using a huge directional antenna for years trying to grab free hotspots in my neighborhood and honestly the cable connectors are quite shot, the antenna has been banged around for 10 years and it's just been an OK solution. I made your omni bi-quad and got about 30% better performance without having a 75 foot lmr cable running through the house to the back porch. This is a 30% difference *right at the router*. Amazing. Thank you again!
I'm new desperately yneed I WiFi, I'd like to see what the connection to the phone itself and now to configure those wires,,I was gonna use a tyhp that I had handy that has smaller,yel,Rd,BLK,why, small er wired inside Casing,what should I use?
Lots of questions about wire thickness. Thicker wire will give you a wider frequency range with acceptable impedance match to the antenna. We use the word "bandwidth" for that ... but "bandwidth" means something completely different to computer people than it does to radio people :-). So, use what you find convenient. If your wire is too thick, you will have a hard time bending and soldering it. If it is too thin, it will not support itself and hold its shape. If you stay away from those extremes, anything will work. BUT ONLY USE COPPER! (or silver or gold). With such small dimensions, there is not real cost benefit to using fencing wire and it will not work as well or be as easy to solder.
+Robert Ahrens Thanks! I used a more thin wire, better to get more precision while bending it to wave fractions
+paulkazjack. I think brass would be fine. Let us know how it works!
Thanks. I shall put my roll of 6mm high tensile steel fencing wire back in the shed then. Phew! :O)
nice job. thanks for your videos. i've learned so much from them. i wish i owned one of these sweet antennas you have made.
Wow You are the antenna Man. Great design. Stunning performance. I will never buy another wifi antenna again.
I connected this same size of omni directional BiQuad antenna as an RX antenna on my drone. So far It has given me about a mile of seamless control and telemetry. That is if I fly my drone in a horizontal straight line from the TX controller. I have it mounted upside down on the belly of my camera drone. The only time it gives me trouble is when I gain altitude. And the 2.4GHz RX is at a 45 degree angle to the TX BiQuad directional antenna. It will cut out and I get major signal loss. It does not perform as well as my skew planar clover leaf design of about the same size. The LHCP skew planar antenna has no signal problems from most any angle. But this BiQuad antenna matches the 4 leaf clover skew planar receiver in distance. As long as your not at a steep angle to it...
thnx andrew for the detailed video i was need that omni so much cuz its as i see easy to make and powerful !
Thank you Andrew for these videos
I was thinking about just taking your bi-quad and doing something similar the last few days, very interesting video as are all of yours :)
Thanks Dylan glad it was helpful
I'll give it a crack in a few days :)
Shorting of both connectors using antenna ? How that works, I wonder. Because onboard antennas never short both connectors . Isn't it stragne??
did this one, easy to do works great, replaced my dipole on my AP with it, great improvement !
GJ nice design.... the shape looks very nice... and the gain went from 70% to a hardcore stable 94% Thank you for such detailed video . keep researching antennas maybe one day u get communications from an alien :P
The rigid is the best because it's shielding is actually soldered to the sma I have made some great patch antennas with it.
I also built an antenna and did some tests, the result was good, it really improves the signal... I'll test it in the open field in a soybean field, I'm curious about the result... Thank you, greetings from Brazil
You need a better soldering iron. It certainly does not reach the temperature sufficient for this work. Excellent project. Could you make the formula available to find the measurement of the antenna elements? Greetings from Brasil.
thank you. I am using this and it is a massive improvement. how would you make this with circular polarization?...simply a 45 bend of each square?
Great Video, Re jigged for 1090mhz with encouraging results so far.
just built one of these today, the alfa 9dbi omni antenna beats it pretty easily. disappointing for all the pita soldering I had to do to make it.
Most antenna designs I have seen require the inner and outer coax to be isolated ie no continuity the centre goes to the radiating element and the outer goes to the ground plane (isolated)
With this quad antenna design the inner coax is directly connected to the outer coax via the copper wire radiating element, ie not isolated?
Is this because each element is actually a radiating and ground plane element? Would make sense I suppose.
I can see the gains over a traditional dipole would be much increased as the radiating pattern would be flatter, less signal going up vertically and instead going further out horizontally? I'm assuming this design would be suitable for 2.4ghz radio control models?
Wireless Channel Quarter Wavelength
-------------------- -------------------
Channel 5 - 2.432 GHz 30.84 mm
Channel 6 - 2.437 GHz 30.78 mm
Channel 7 - 2.442 GHz 30.71 mm
Channel 8 - 2.447 GHz 30.65 mm
Channel 9 - 2.452 GHz 30.59 mm
Channel 10 - 2.457 GHz 30.53 mm
Channel 11 - 2.462 GHz 30.46 mm
Channel 12 - 2.467 GHz 30.40 mm
Channel 13 - 2.472 GHz 30.34 mm
.
andrew,
your videos are very well done educational and fun, thank you.
i was wondering whether you can make a video about you testing method, HW and SW you use etc. if you already have made one please provide a link to it.
thank you
Micha
Isn't it rg402? 316 is the flexible stuff
Hi Andrew,
Great videos. Could you tell me (or anyone else building a Biquad Antenna) the exact product number for the SMA connectors and for the flex coax? There are so many variations. Never build an antenna before.
Thanks
What is the impedance of an omnidirectional biquad? How does the feed spacing (3mm mentioned @ 2.4 GHz) relate to the frequency? Has anyone made this type before? I searched but you are the only reference I've found.
I started in wireless in 1999 developing WiFi with Cisco but haven't been playing since 3G came out and killed our company but I just figured out I need to get back to it and I really like that you sound like a, well Irish, english, Scottish which my Mother is first descendant. I will watch you and your videos are great. what if you tried using a piece of barb wire do you think that would throw it or catch more? I saw that at a presentation that my friend at Cisco put on
Thank you for this information love it!
Hi Andrew.
I have no previous antenna knowledge but learn a lot from your videos. Thank you.
My Windows 7 computer (Lenovo K410 IdeaCentre) is in a remote location about 30 feet from a Belkin router (unfortunately they both have internal antennas).
I have a question if you don't mind.
Is it possible to strengthen my signal with the antenna limitations I have just mentioned and how? I would like to build your Bi-Quad Uni-Directional antenna assuming there is the possibility for improvement. I am probably closer to one neighbors modem than mine.
Have you measured the the current, dB, and wavelength at the point all antenna leads converge into one wire? What does that wavelength look like? Is is mixed? Noisy?
Would one see enough improvement to change either to 1/2 wave or full wave for the length of each element side? Is the length of the coax critical or could it be 3 to 5 times longer than shown? Thank you for your kind assistance.
can someone please tell me what are the measurements of the biquad antenna shown in the video
Thank you , it is powerfull antenna. you are helping make antenna better and save
money :)
Hi, do you have any idea for an powerful TV omnidirectional antenna? I would like to make one for my camping car. Thanks!
Hi pal, Good video. I was just wondering about the length of the antenna coax. I know it is important but not exactly sure why?? Thank you.
Can you do a new one for 2023 , I want to build two for an ALFA wifi adapter AWUS036ACH any tips for making antennas for this device
So if these work so much better! Why is no one selling them?
hi , thanks for the video, i whant ask you where can i buy materials ??
Great video! I am really starting to get curious to the science behind the antennas. Do you know any good place to start learning a bit about it?
An other question I have is how this compares to the Celtic knot design if I wanted to use it as a wifi antenna?
Hey Andrew, how can we improve on this design please?
I know that you aren't very active on TH-cam lately.... it would be nice and extremely helpful if you could show us a best way to improve this design?
For rooftop of a camper van for example. Thank you so much. 🙏🏻 PS: Your Biquad Yagi Antennas are awesome!
Andrew, could you write the measurements of that biquad antenna?
hello, would this also work for 2.4ghz wifi? and would is be possible to combine both 2.4ghz and 5 ghz into such an antenna? And what is the exact wire diameter in mm? regards
Good work, good video´s. Clear spoken and good explanation.
Question: What the best antenna for a sender. Like for FPV-Copter in 2.37-2.42GHz?
Hi andrew.
You videos are awesome, really informative and creative. Is it possible to buy one of the antennas you make? I am really keen on buying this specific one.
Hi, the class was good, I have some doubts, it is with respect to the material that would be used for its construction, specifically, the type of cable or cables that could be used and what would be the difference between one or the other; Example: the ideal is the 50 Ohm RG58 coaxial cable, some use other 75 Ohms cables, and even since they use electric rigid cable from 1.5 millimeters to just over 3 millimeters. Diameter of cable, etc. Regardless of the type of antenna being built, whether type Biquad, Yagi, Dipole, etc. The serious question: Knowing that it would work for base frequency 2.44 Ghz, which would be the best cable to use, for the elaboration of an antenna for the WIFI, either to use it as receiver or emitter of such signal. And that made so much difference in using one cable or another. I have known that using cables with 75 Ohm can damage the network card or the equipment used. How true is this?
Sorry for my bad english
I learnt a lot from your videos
hi Andrew ... can you please cover some antennas for mobile technologies like gsm,lte etc .. thanks
could you do a cp of this one?..just bend the qauds to an angle? I love the performance of this thing.
How did you arrive to 50 Ohm feedpoint impedance ?
Can I use this design to boost 4G data signal from a telecom service provider, inside a metal bunk house by placing one antenna outside and other inside; provided, both are connected via a TV coaxial cable?
Also, what is the ideal wire thickness & specifications for both antenna and it's coaxial cable.
Please reply urgently.
Thanks for the tutorial. Can I use it for tx, on web I found that biquad can't be used for tx due to rf wVe reflection from antenna. Plz tell me how can I use this for tx. I want to use also omni double biquad for tx and rx
Hi Andrew, great work.. excelent video´s. Thank you.
One Question: I want to use at a copter, a skew planar (2303-2402Mhz) only for sending (video-Broadcast) and at ground I would use a 3times diversity receiver, with different Antennas, to solve different distances and Area-angels.
My Idea, to use two Helix 4turn or I´f seen in your other video, two Biquad-Yagi for the far range, and a clover Leaf in near range and around me.
Do you think that will work?
Should the thicknes of wire the same as in your´s?
For each Antenna I have another Wifi-Stick (TP-Link W722N) with modified driver special for 2.3GHz.
As TX I use a Alfa AWUS036NHA, also modified driver.
The diversity and the broadcast is working today, but the distance is not really good, so I would improve this.
I use it not in GB.
Great excellent work Andrew I need you to help me if you can to make a biquad antenna for 4G in 1800Mhz and an antenna that is powerful to transmit wifi over long distance
Hello Andrew, thanks for the video. I do have a D Link wireless router which has a SIM card, the quality of the signal is poor in the house. Can the above help in improving the signal. Thank you
ok , great antenna, like video and design . What is the scope of your project's antenna ?
can i use it for mobile signal boosting without feeding to any amplifier and similar antenna to other end of coax in my indoor
Can I the copper wire inside the coaxial cable for building the antenna? Also,can I use this for boosting 3G signals?
Can this type of antenna be used for 850 MHz on a Gilsat dish to improve my mobile phone reception in a passive system. Great explanation. Thanks
I need to understand a small thing, so this method of solder cable on the antenna is shorted between center and shield from cable , right ?
Can you add 4 of the directional antennas to the same connection and point them in 4 directions?
I'm trying to integrate your design so that it would fit discreetly into my laptop. Would it work if I break your design into two antenas? I'd have one biquad inbuilt into the back my LCD assembly and another would be built into the bottom of the portable's chassis. Both antenas would lead into the same Wifi stick.
Have you plotted directional pattern? Just looking at the design I'd expect peaks broadside to the component biquads, with weaker signal in between.
when making the element does it matter what the outside measurement is as long as the inside is 31.25 mm and 62.5 mm or would it make any difference making the measurement center to center on the wire ??? thanks for the help
Hi Andrew just found your channel as looking for a wifi antenna to fit on the roof of our touring caravan, I would love to make one myself as back in the early days I always made my own shortwave and CB antennas so have all the required tools to make a wifi antenna. Would be looking for omnidirectional antenna which I could permanently fit onto my caravan roof, is there one of your videos you would recommend to follow. Thanks and keep up the great videos from a new subscriber.
which type of networking we have to use to do the whole 21 floor building wireless internet use?
hi andrew. thanks for making this video. its so helpful. i would like to ask. how to make 16dbi omni directional biquad antenna? please make a video for it. Thanks
What the antenna isolation gives? and how to know which parts of an antenna need to be isolated?
Made this antenna the other day with the idea to upgrade the two modified antennas on sky box. Good easy build but I'm not getting any improvement on signal compared to std antennas! Any ideas where I went wrong?
Can I use this antenna with wifi router to extend my router coverage?
Yes
Gostei! Fiz aqui, não ficou igual e nem perfeito, mas o resultado foi bom.
Hello,
I have watched this video a couple of times and am in the process of attempting to build this.
Couple of doubts I have :
- Can aluminum be used. I have lots of 2mm aluminum wire readily available, the kind used in power cabling. If yes, will the design differ in terms of wire lengths etc.
- Your measuring tool is 31.5 mm. Shouldn't it be 30.6 mm. (Average Quarter wavelength - Mid of Channel 8 & Channel 9)
hi Andrew, very good video and interesting antenna model, the dbi at that size as I understand are 8 to 9dbi, you know if increasing the size can reach 15 or 20 dbi?.
Hi andrew,
How the diameter of copper wire affect the antenna's performance?
thinner is better
thicker is more durable
When going from the 1st bend to the 2nd one do you actually put the 1st bend underneath your measuring tool?IE: inside / inside from the wire is 31.5mm?
чтото подобное я и искал, спасибо) thks ))
Really awesome video! I'm in no way an expert or anything, but isnt it the RG316 that is the thinner wire and RG402/RG405 the thicker silver wire? At 4:20 in the video. Great video though and I will subscribe for more :)
Andrew, I may have answered my own question by watching your USB Wireless Antenna Mod. Will a USB wireless antenna work on a desktop or just a laptop. Thanks again.
Maybe i´ll build one in dimensions for 4G. Thanks for showing this.
A few days ago i´ve build a biquad for DAB+. With standard antenna i got only one transmitter with some ensembles, but with the biquad there are four with 89 stations! So i think it should be worth to try a double-biquad, or a multidirectional one for it.
What´s about an omnidirectional double-biquad :-) ?
Hello Sir, I am looking to purchase two of those and antennas. Please provide a link to purchase.
andrew mcneil I have a need for a directional antenna with a wider angle of coverage. Looking into making one I stumbled across your videos. Do you have any suggestions for an antenna that would do closer to a 180 degree radiation pattern? I don't need the signal to go behind the antenna at all and would like a little more range out front.
What do you suggest about LHCP or RHCP? for 5.8Ghz VTX/VRX antennas they are using that curved polarization too.
how to connect this antena to Wifi router or if I have a 3G Usb dongle how can i connect it tow this antenna
Does it have to be 1/4 wavelength, could I make an antenna of this design but change the length to 1/2 or 1 wavelength? would they give me better results? obviously the 1/2 and 1 wavelength model s would be much bigger.
Hi, how you measure the signal strength of the connection, are you connected to a WIFI hot spot? what is the program you use for that, do you use some hardware?
and Another question? This one should be on the plane right? so can I use the path Directional with it, or do you have a good idea for the ground station antenna too?
Thank you....:)
Could I use this antenna on a 2.4ghz radio transmitter for RC planes? The receiver on the plane is eg a FrSky (D8R-II Plus) with twin antennas that are normally arranged at 90° to each other. The stock antenna on an RC radio is normally a "rubber ducky" type. Thanks
Outstanding Video!!!
Hi Andrew.
Thanks for your very nice and informative videos. Havn't seen them all yet, but will. I noticed that you used a software called Vistumbler when you compared the antennas.
I've installed it now. May I ask how you get the info into your computer. I get all wifis nearby, but can I catch my 433mHz telemetry, my 5.8GHz video and my 2.4GHz control traffic into this software too? If I can, how? Any special interface?
Hi..I was wondering, my friends and I wanted to make this and we wondered how we could innovate this to a better one? So do you have any idea how we could do that?
Where do you get the semi rigid coax? Is there a part # or name for that specific coax?
Can you please show me how can I set this antenna on mobile phone?
can I use this antenna to receive an RF signal? cause I have my thesis about rf harvesting and I really need a good antenna for that. thanks in advance
Please pardon my ignorance. Can this sort of antenna be used for over the air television?
Hi Andrew. so if I want to build that biquad antenna I have to know the quarter wavelength of my transmitter?
where do you get the software to analyze the signal?
Hey Andrew, do you have a design for drone antenna? one for transmitter and if possible one for received (drone part)?
Hi, can I know what is the diameter of the copper wire used as antenna in this video ? sooryy. :)
Andrew, great video, do you know how many square feet covered indoor, just I want to extend the same ssid for my outdoor IP cameras. I get a wifi extender but it make another wifi ssid, so cameras can not see my pvr.
gives me a idea for a ADSB antenna !