Antenna Basics” The Single Biquad” 2.4GHz

[@andreww.6507]

I love this video in particular. So many memories coming up :) I would give 4 likes if I could. To share the story, when my friend and I were about 15, although we went to an information technology related school, his dad only allowed him 1 hour of internet access a day through their router. So we went ahead and bought a Linksys wrt54g, flashed it with Tomato and built two double-biquad antennas to have a directional link to another friends house :) My friends dad is a professor at a university so he is pretty smart and he kept asking questions about that thing mounted to the window but in the end he never figured out what it was haha

[@chriswf]

That's an awesome story lol. When I was a teenager if I spent too much time on my computer, my mom would take it away. So I built the computer into a dresser drawer. And left the case in her closet. I used my TV with S-Video to play games. Covered my keyboard with my bed covers. She never caught on either. She got very close though, many times. Like "I thought I heard a keyboard!" Good times.

[@masameer1177]

Please can you make a dual band 15dbi Yagi antenna

[@NamdhariInfotech]

I am only got 1 lpda antenna gain extra long elements with 4g router to 10 to 15 dbm gain but i am searching and making aome 4g router outdoor model need to know get which can help me to work with 4g routers and get network even in no network area or very low areas outside i mean

[@louemon7836]

That is a cool looking antenna!

[@cyberjack]

you really treating us ... thank you appreciate your videos and your time

[@ellenorbjornsdottir1166]

If you ever feel like an impractical project... directional biquad for broadcast FM radio - or 3.331 meters. A quarter wave (the basic unit of the biquad, made of 8 of them) would be 83cm. That's a lot of wire. 6.662 meters for the driven, to be exact. I might some day build a yagi version.

[@acestudioscouk-Ace-G0ACE]

This is handy, I still use CDs in my job and have a few cases around. As you say, they are not easy to find now.

[@thecentralscrutinizer5105]

Another incredible primer, Thank You sir ;) Cheers

[@kavindugilshan]

Is it good 2 biquad element put x polarized on top each other without touching as an LTE antenna for parabolic feeder ?? Or is there a better solution for LTE MIMO with parabola ?

[@catalinalb1722]

Hello Andrew, you remember the small 💿? Can they be used as elements for a yagi setup? And the big 💿 as reflector all lineup on a plastic stick / tube...

[@ibnurachmat8444]

it means that both poles (+) dan (-) connected, right? is it good for the router? since (+) dan (-) are shorted.

[@gammaleader96]

Nice, this one feels pretty nostalgic. I actually built one of these around 12 or 13 years ago. I didn't know about groundplanes back in the day so I used a CD as a back reflector, which doesn't work very well at all. (The hole in a CD fits pretty nicely on a bulkhead BNC connector however) The CD box makes for a nice, somewhat weatherproof enclosure.

[@manwhoeatsfishinbedwithlig3791]

I would like to make a diy antenna for 4g lte for a cellular wifi router Would you recommend the 4g rail gun or another diy antenna

[@NickD331]

I'm probably overthinking this, but... when you butt up your pliers to the measure, then bend, the last few millimetres become the radius of the bend, so is it OK that the actual straight leg of each section is less than the desired length?

[@andrewmcneil]

Your over thinking it Nick. Now mm wave frequencies it would be a problem.

[@NickD331]

@@andrewmcneil I made my first antenna, your "piequad" (pie was lovely :-).... and the first thing I did after construction was attach it to my NanoVNA to check it out. I can imagine being my first attempt, I've made some heinous errors, but didn't expect the SWR to be around 12. Don't really fancy attaching it to the Alpha and transmitting, I'm too chicken. Can you tell me what SWR I should be expecting from the piequad build? What's the SWR of your's? If I had a benchmark to aim at, I'd be trying to do better.

[@andrewmcneil]

@@NickD331 A biquad has an average VSWR of 1.5 to 1.8 similar to most Yagi's

[@DAVIDGREGORYKERR]

What about a Microwave version of the DB4 Antenna for 2.4GHZ which is balanced and uses a Coaxial Balun.

[@sipansibabdreddknot5179]

another good content tutorials, ive build like this one, and move to biquad yagi 5 elements 3d printed

[@TuttleScott]

me too, I got the model from thingiverse and its the best performing antenna I've ever made.

[@djbertinho1984]

Can be used as parabolic "lnb" for long distance WiFi?

[@ellenorbjornsdottir1166]

Try it! Let us know how it goes

[@yassinouakka126]

lovely video!

[@stridermt2k]

That is certainly an accessible antenna! Great stuff!

[@nxs_ayt]

👍

[@rtv1196]

Hi, Andrew. Thanks for your very useful videos about antennas. I've already did omnidirectional biquad antenna from your video and it works pretty good. I also need some simple directional antenna to boost my 2.4GHz (ch6) WiFi signal to connect some outdoor IoT devices. What design could you suggest? Signle biquad or single patch antenna like in this your video: kzbin.info/www/bejne/qIulgJyEecyKrsU?