Mini Helical Antenna 2.4GHz
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- Опубліковано 5 кві 2013
- Although this helical antenna only has 3 turns it is portable and the performance, only slightly less than a 14 turn helical antenna.
templates can be downloaded here: docs.google.com/file/d/0BzmJx...
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Email: andrewantennas@gmail.com - Наука та технологія
I was having a look at the template and spent a good half 2 minutes thinking how to flip the design to get the opposite polarization then I noticed that there were both left hand polarzied and right hand polarized antenna designs. Thanks for that :)
this is pretty awesome. thanks for the video Andrew
nice job! like the matching stub! thanks for posting!
Thanks loads This without a doubt is my best wifi antenna to date thanks to your video. Its portable waterproof. Outstanding.video mate.
I think circular polarized waves change too when they are reflected. Left hand to right hand and vice versa.
Linear polarized waves do not reverse from horizontal to vertical on each reflection they may or may not change polarization at all depending on the shape of the reflector. No single reflector I've ever seen can change pure vertical to pure horizontal or vice versa. Two reflectors could if constructed just right.
If linear polarized signals shifted 90 degrees with each bounce then parabolic reflectors would need a vertical feed to receive a horizontal signal.
Circular polarized waves on the other hand will reverse left hand to right hand or vice versa on each reflection.
This is how if both ends of a link are CP it can greatly reduce multipath interference.
Single reflected signals are ignored by a good CP antenna because the rotation is going the wrong way. Signals that are reflected twice are rotating the correct direction but are usually greatly reduced compared to the main signal.
Great video! Thanks Andrew!
Comments have been said I'm sure but I too don't agree with the analysis. You're right that reflections are a problem with linear but it isn't because the signal is reduced its because it stays the same. A cp signal on the other hand is reduced as the polarization is reversed. What that means is that cp antennas reject multipathing better than linear
Hi Andrew. It was a real pleasure watching your video. Thank you for sharing your wealth of knowledge. Do you have any pdf templates for a 1900-2100Mhz Helical?
Another great video mate.
Outstanding brother. Cheers. ♥
Great vids....... Can you do a vid compairing all the antennas you make.... would be interesting and fun to watch....
Dji's extended antenna kit w/amp, are conical-helical, made of silver-wire, it is the most ultimate compact antenna.
could you explain the no. of turns and width of windings also coper cable size. awesome video
thank u.. keep going...
Hello, thank you for this template, but can you tell us any size in this project ? I have problem with making reflector because i don't know R diameter size.
Nice video. My question is 'why solder the metal shin with the sharp edge facing upwards instead of downwards? cos the shin is supposed to bring down the impedance down to the sharp.edge'
Thank you.
Hi Andrew! What type of antenna do you recommend for a place, where there are lots of trees (mountain region)? Would the helical antenna be the right one for me?
Andrew, your videos are sooo fun in a nerdy sort of way. (Nerds rule!)
nice work!
Hair style day is bangin' mate!!!..
any diameter of the circle of metal, the base is it ? iv got all the parts from radio shack, im at the wrapping my wire part. will copper wire from the middle of home arial coax do ? its 1.00 mm in dia on my digi calipers. Thanks for showing us your stuff. will this be ok from flat 1 to reach up to flat 4 above. basic terraced house size?
good video. The little triangle what materia is,, is posible to do the same material like reflector, thanks,,
Hai. If I using cooper wire, how about the matching impedance? Are same with your design? Thanks.
Thanks Anndrew, I did it, but i doesn´t get better than a 3 dbi omnidirectional antenna. Any advice?
What if we are only required to create an 800Mhz helica antenna? What are the adjustments that we are going to consider? Thankyou
Don't CP signals change direction when reflected?
In this video you stated to use a cardboard tube. I am assuming that the cardboard tub's dialectic properties is closer to air, than to say a PVC pipe. Could you make a template for PVC supported tubs?
you are the best, thank you
Great job.
tnx for info i have finish building it and it is working fine but i need some info about it to put in my textual part of a exam so do you have something like some wiki page abut mini helical antenna
how do i know how many turns or the spacing between the wires for a specific frequency?
how you are connecting to laptop usb or it only increases wifi capacity.
how about the connection? its good but not detailed, may I ask where did you connect it? thank you
Very nice video but: 1. your bnc feed connector seems quite a bit offset to the side so the first coil is not really a coil. 2. in all the helix designs I've seen the first coil is starting very close to the ground plane and then gradually going up so that impedance should be close to 50 Ohms. 3. The hypotenuse side of the tin stub is usually soldered to the cable. I am a little puzzled about this type of feeding the cable to the connector...
I built a helical antenna 2.4 ghz, I have to dajarla uncovered? If I put a plastic tube closing completely lost profit? It is just a glass of plastic tube ... appreciate your answer greetings, thanks,,
Looks nifty, might try this for r/c
hey i am building this for my finial exam in high school and am having some trubble finding that bnc conector that you are using so if you can give ma a exact name of it i would apricite
HOW TO CALIBRATE THIS ANTENA ON THE SWR METER YOU ONLY MAKE THIS ANTENNA BUT WHEN YOU CONECT WITH AMPLIFIER OR WITH ANY EQIPMENT TX 2,4GHZ IT,S POSSIBILE TO BROKEN TO BURN THE TRANSISTOR FINAL
BNC Female connectors chassis panel mount. Have a look on ebay, maplins or rapid electronics.
Show the template dimention
What does the metal shim do?
I need helical antenna 20dBi on 5.8G,is it possible and how many turns i need?
Please tell me the measurements i don't have printer :(
what size paper are you printing the templates on to? if the printer re-sizes its all gone to pot. is there a dimension these templates should be?
A4 just make sure adobe is not resizing it.
thank you
what material is this little piece of metal you use for adjust the impedance is made of?
Can I use a soda can, for instance?
What gives better maximum range (gain) than Helical Antenna? Windsurfer 9dbi, bigger windsurfer 11.4dbi or Double BiQuad 13dbi?
Your answer is in your question. The number you gave on each antenna is the gain.
good stuff
One should design a convertible antennae that the cup could be compressed into a disk and bounce back in a few seconds.
for the cardboard tube, can i use toilet paper or kitchen towel paper tube?
Listen at 2:48
he said you could. the critical part is to use the template
Thanke you :)
I wanna put that on my goggles...the first one lol
Make a video showing us how to make it because this video doesn't do it.
What is the diameter of the coils, what is the distance between the coils, how to know what size shim I need, how to know what size reflector I need, and finally fine tuning after its working.
thanks mate.
I put one together quickly and I get an extra 5-6 db but thats it
Did you not notice the PDF in the description
@@andrewmcneil haha nooo ty. I made this best I could and it was only slightly better and all most placebo I guess Im not sure what to expect so not sure if I failed or not.
Using Ubuntu airodump-ng for rough data
Nice Hairs!!!
decent af
How much gain can i get with this antenna?
Around 9db
BNC connectors are not very good at frequencies above 500 MHz. You should use a bulkhead TNC or RP-TNC connector.
I thought that too (lower bandwidth threshold) till I actually researched the matter. They are good up to 4Ghz.
You sure thats not TNC?
Adriel Elfnet TNC is good to 15Ghz and is basically a threaded BNC connector to combat vibration issues.
N connectors only with lmr400 only.
what lol where did you hear that? We use "{N" connectors for many types of cable from RG-8 to heliax
which noodles you recommend? 😂
bombay bad boy
nice hairs
dus not look like a true Helical its looks like a sprint antenna a Helical has loops in the wire every so often
I always assumed John D. Kraus invented the helical antenna
+vorkev1 andrew's video is a shortened helical antenna with only 3 turns. Instead of loops like you might see in a loop antenna, helix antenna loops/turns are pulled out like a screw and when operate in axial mode give high gain on its tuned center frequency.
gd
I had to stop watching at 2:48 when my bullshit threshold was exceeded. Cross polarized signals (linear or circular) lose about 10 db of gain. Cross polarization is when you transmit with vertical polarization, and receive with horizontal, or if you transmit with right-hand CP and receive with left-hand CP. Using a CP antenna to receive a LP signal loses about 3 db of gain. Every time a circular polarized signal reflects off metal, it reverses handedness. If you send it out left-hand CP, it reflects right-hand CP, and vice-versa. Reflecting linear polarized (LP) signals off metal does not change the polarization at all. The advantage of using a CP antenna to receive LP signals is you don't have to match polarization, but at the cost of 3db of signal. This is especially useful if the source is rotating (such as a satellite), and the polarization orientation may not be known, so you can avoid periodic deep cross polarization nulls.
does this mean a cloverleaf antenna is adequate to receive the signal of a dipole at the expense of 3db? (5.8 GHz video signal)