 Without any further ado!… Before we go on, here are the formula. 1L = 300/2437ghz (channel 6 as centre frequency) = 123 mm To start with.. my initial approach for the element material was to use an electrical copper wire with a size of 2mm in diameter, I found one and I start to bend it based on “Franklin Array” theory using the waveguide for my element size, after the bending work I found out that the wire is too soft and it won’t stand straight so I scrap it, I went to my backyard and I found a copper plated welding rod with the same diameter, the rod is hard to bend (which is good!) and the only thing I hate with it.. is it takes a lot of curved at the corner edges ( approx. 2mm), I have to adjust my measurement and deduct the edges size to give me an exact element size, instead of bending the wire at 30.5 mm I bend the wire at 28.5, the result was exactly 30.5 from the tip of the wire to the edge of the corner. (the element dimension will be at the bottom of this page), I made two elements. |
 My first idea for the reflector is to use a strip of tin can or a brass sheet, I already have this material at hand so I started making it, I cut a size of 61.5mm x 495mm (the actual length should be 492mm or 1 wavelength x 4) but I added another 2 mm for the connector space, then I drilled a hole in the middle for the N-Type connector, after making it and mounting the connector I am not satisfied with it as it tends to bend in the middle, both material is too heavy and it bends (with the connector attached), I went to buy some pcb board but the store do not have a board a size of 61mm, all they have is a pre-cut of 40mm x 40mm only, this is another setback for my project, instead of giving-up, I found 6 pieces of my unused 1mm aluminium plate from my previous project (biquad project) the aluminium was already cut to 123mm x 123mm (I almost throw it a week ago!) anyways, I only need to cut the aluminium to 61.5mm as the length is already 123 mm, I cut 4 pieces of it, I kept the excess part for joining them together, I drill a hole in each corner and attached it at the back for support then I use rivet to bolt them together, after doing all riveting (which is a real pain) I drill a hole in the centre, I was very surprised with the aluminium reflector, it doesn’t bend it is lighter compared to tin and brass ( I guess this is the way to go!) I reckon the excess aluminium that I use to support the backside to join the plate helped the whole structure not to bend, I am not sure if using a whole two 61.5 x 123mm of plate on the top of each other will provide the same stiffness, I will try it later when I get a chance to buy a big size aluminium plate. |
 At first I thought of using a rigid coax cable such as RG213 as a feed line directly connected to the element but I was worried it will not hold strong, instead I opted to use a N-Type connector, For the feed line I cut a 29mm length of copper tube with an outside diameter of 9mm and inside diameter of 8mm, then I cut a 45mm RG213 coax cable and removed the outer shield and the braid shielding, I solder the coax I prepared to the centre pin of the N-Type connector, (make sure to solder it on the pin as close as possible. After soldering the coax, I inserted the copper tube and solder the whole edge at the base of the N-type connector. |
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November 28th, 2005 at 14:34
Wow! very impressive.
I’ve build several antenna for wifi but have never found a design for a sector before.
I look forward to you long distance results.
Dan
November 29th, 2005 at 17:59
Got the idea, I am building a sector antenna based on your design, but will be using a different radiating element.
January 14th, 2006 at 16:42
I too live in Saudi Arabia, Rabigh is home for me, Facing the same problem, need 150 metes of WIFI coverage. Any help or joined support, would be great.
Regards
Lamar
April 12th, 2006 at 23:42
What is the dimension of center element copper wire.
May 9th, 2006 at 16:31
What are the dimensions of center element.
May 23rd, 2006 at 13:25
Great job guys… Thank for you work…
June 11th, 2006 at 17:35
Perhaps you should put a link to the original design ?
http://www.qsl.net/yu1aw/vhf_ant.htm
June 15th, 2006 at 1:03
@foobar
what makes you think that the link you provided is the original design? are you aware that the 4NEC2 has a template for that particular design? are you also aware that i have the pdf documents the chap did mentioned? he clearly states how he did his and none of your so called “orginal design” has the same dimemsion he used, although it has the same design look. That doesn’t mean he copied it or got the idea from your so called “original” design.
incase you are not familiar with the things i mentioned, STFU.!
give the chap some credit.
June 25th, 2006 at 6:26
Great.
Can we increase the gain by increasing the number of elements.
July 17th, 2006 at 20:53
My first project was a radio telescope 10 years ago, now I would like to build something that is
VERY directional and can send and recieve to and from wifi devices with a range of over 2km
what type of antenna is required I would rather build the thing myself if possible
Please help
August 14th, 2006 at 16:29
Did yoy see amos 9 sector antenna? http://www.qsl.net/yu1aw/vhf_ant.htm Ithink it is a good antenna, i have made one and it works better than pacific wireless SA24-90-17 antenna, and i did not make it with perfect reflector. If some one try to make one i have interesting solutions for easyer making, contact me one zoran.s@verat.net.
August 19th, 2006 at 12:15
I am going to build it soon and let gives u the result