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Behold the Beerquad [Jun. 27th, 2006|02:28 pm]
As they (don't) say in Italy

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That's right, Double Biquad luv! Twice the copper, twice the pleasure.

Ahhh, the art of the Cantenna. There's nothing like finishing off a reliable DIY 2.4GHz antenna to fill oneself with pride. When $10 of shopping nets you a $100 antenna plus lunch, you begin to appreciate junkfood in a new way. As a project approaches, each Pringle tastes sweeter and sweeter (or saltier and saltier, so many flavors!)

Alas, there are many cans. They come in many shapes and many sizes. Not all are well suited for cantennas. Thus, the world of the Beer Cantennas is lonely, with few examples.

Ladies and gents, kids of all ages, THAT HAS CHANGED! I sumbit my latest, greatest invention. An invention that utilizes cans of any shape or size! An invention that revolutionizes the way we do wireless! A tool that will turn the world of cantennas INSIDE OUT!

Behold! The Beerquad!

Biquads aren't new. Just googling for biquad nets lots of results.

The hard part is making a reflector that is 123 X 123mm, or, for a double, 246 X 123mm (or 110 X 110mm for use with a dish, see Google links.) For a biquad, 14oz Guinness cans are perfect. For a Double Biquad, the Labatt's Blue at 25oz was a TIGHT fit (practice your cutting!)

Alas, I am not the authority for wireless works. This is, literally, my first antenna of any shape or size. Compared to other double biquads, it rates on par (others are around 45dB SNR, mine peaked at 48dB with sustained of 46dB. Without a side by side comparison, though, these numbers are meaningless.)

My project was an answer to the fact that, indeed, beercans aren't used for cantennas, and that's just wrong. All garbage is created equal, some pieces more equal than others. Beer cans? Beer cans can be a symbol of taste and pride. Besides, they can be made to look damn cool.

So the following isn't the worlds best guide to how to make a biquad, it's merely an example of how to make a beerquad.

I'm Labattman!
I really like how this turned out. I was split between whether I should keep both logos or just go for one, but since this is a double biquad, it made sense to go for double theme. I'm glad I did because it looks great, and I didn't have to drill or solder through the logo.

Cementing this much aluminum to acrylic isn't easy, and was almost as hard as drinking 25oz of beer before it went flat (a task I failed.) People interested in trying this, you need to find a good way to vice the two surfaces together. When cured, you'll see where the contact failed. Adjust, and make another.

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Turning the world of Cantennas inside out!

The reflector is 244x122mm so it's quit large for, say, a laptop mount. I'm going to do it anyway because it's 1337! This IS a stand alone unit. I won't be using this with a dish.

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Note where the antenna would intersect itself. I have a little jog there to prevent problems

There aren't many tricks to my application. For the brushed aluminum, I used a Dremel and a steel brush (I wanted to use the brass brush, but it didn't live long.) For the element, I was especially careful in preventing the wire from touching itself. Otherwise, I pretty much followed the instructions from Engadget.

It works fantastic. I haven't had a Pepsi (Labatt's?) challenge with anyone else's equipment, but my readings with netstumbler look typical.

I have 3 more to build, all Guinness. Two for my dishes, and another standalone. All of these are single biquads.

Fun stuff!

I just made a mounting system out of 3 PVC joints and some thumb screws. Pictures later. I SHOULD be writing my final essay.

[User Picture]From: xothia
2006-06-27 09:53 pm (UTC)
Forgive my ignorance, but what is it?
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[User Picture]From: demi0urgos
2006-06-27 09:57 pm (UTC)
No, forgive me. I should have explained. I'll get to that. It's for wireless networking. It's a directional antenna using the finest Candian has to offer. You should be proud!
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labatt blue - (Anonymous) Expand
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[User Picture]From: n6ko
2006-06-27 11:53 pm (UTC)
As we in the US westend say, wootisimo.

Will a guiness antennae without dish do 100 meters or so?
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[User Picture]From: demi0urgos
2006-06-28 12:10 am (UTC)
Easily. With dishes, they should do miles.
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From: (Anonymous)
2006-06-29 05:52 pm (UTC)
Check this out!

It's my first cantenna. I made it when I was 10. Which is a freaking long time ago now. My dad saved it... That part I don't get, but at least I have proof that I was a visionary and ahead of my time, even as a child. :) Anyway, it worked pretty good for UHF. I could slide the cans around on the stick and get different channels...

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[User Picture]From: demi0urgos
2006-06-29 09:52 pm (UTC)
Hehehe, if your dad is as geeky as I think he is, of course he'd save it.
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From: (Anonymous)
2006-06-29 08:45 pm (UTC)

Great job

As a Canadian I think you have a great taste in cans :)

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[User Picture]From: demi0urgos
2006-06-29 09:54 pm (UTC)

Re: Great job


I don't know much about beer, but the Labatts wasn't bad. On more reason to run away to canada when the bushit hits the fan.
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[User Picture]From: nancychan
2006-06-30 01:46 am (UTC)
Congrats, you've made it to the digg.com front page~
Awesome work.
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[User Picture]From: demi0urgos
2006-06-30 01:56 am (UTC)
You love me! You really love me!

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From: (Anonymous)
2006-06-30 09:33 am (UTC)

No lips?

According to this site (http://www.lecad.uni-lj.si/~leon/other/wlan/biquad/), lips on the biquad significantly affect the SWR of the overall antenna. I'm not sure how you're going to get that with a beer can, but a lot of your antenna's efficiency is currently being wasted. HTH.
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From: (Anonymous)
2006-06-30 02:59 pm (UTC)
Looks like the hardest part was drinking the beer (aweful).
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From: (Anonymous)
2006-06-30 03:45 pm (UTC)

This is Great.

I beat you to it though, back in October '05 :P I used busch and smashed the can between to layers of a CD case, The cd case just so happened to be with the 110mm size, and I could attach zip ties to hold the work together. (no glue, I was to lazy to go to the store :P ) work quite marvelously. Mine was only a biquad, not a dual. Mine was also not constucted with any mind to proper dimensions, well sorta, I had limited suplies - so its quality shows - I guess I'll have to post pictures too. Hats off the the great work though!! Long live the beer cans!

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[User Picture]From: demi0urgos
2006-07-04 07:59 am (UTC)


Woot! I've make'd it!
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From: (Anonymous)
2006-08-23 11:43 pm (UTC)

Silly Question, but....

How did you straighten(flaten)the beer can?
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[User Picture]From: demi0urgos
2006-08-24 03:03 am (UTC)

Re: Silly Question, but....

Glue. Lots and lots of glue. I got 1.4" plastic and viced the can to the plastic.
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