Construction of a parabolic reflector antenna WiFi performance to improve
A reflector antenna WiFi? There are some good reasons to try to facilitate the receipt of your wifi system, or to increase the signal from the wireless router in a particular direction.
This article gives construction details for an antenna reflector, we have built with tips and advice from other sites on the Internet. Unfortunately it is not sufficient to reach an elevator to reach this goal, the long distances (200 meters) reception, but was better received and would be good for the less ambitiousobjectives.
WiFi Antennas – why are they useful?
With wifi, you have usually one or two small antennas on the router and wireless antenna on your computer to laptops built in a USB dongle. In general, everything you need, but sometimes you need something a bit 'better.
For example, at home, if you study at a distance from the router, you can create a weak signal, or far from the house, a hotel, you have similar problems.
This problemYou can use the antenna on your computer, or home, you can improve the antenna on the router. The idea is that a direction of antenna, so that a more appropriate direction and weak leadership in this regard. With a laptop, usually integrated into the screen panel antenna, and no way to improve it. Then you need a USB WiFi dongle for the purchase of an external antenna connection. Inserting the dongle (USB cable), you can improvereceiving, and installing a larger antenna can improve reception. In both cases it may be sufficient for the problem nothing to worry about directional issues.
But when you have an external antenna, or your computer or router, you can give property management with a suitable reflector, we have, as described below. Another approach is to make your own antenna to the direction from the ground, which is described as a "Cantenna. Basically it is a metal canserve as a guide to the airwaves with a baton in the antenna. On the Web there are many discussions about the optimal size for a Cantenna, with many supporters of a vision paper-fat Pringles.
Our project WiFi Antenna
The background of this project is a stay at a hotel without WiFi, but we know that about 200 yards away there was a restaurant with wifi that I could access the registry (to get a cup of coffee!).
So the challenge was toimprove reception on my laptop, a very weak signal of the restaurant.
So, as always, but I have a number of internet searches, and conversations with friends-tech mind, Jim and Bill. My first thought was to go after a Cantenna, but it seems most appropriate when the signal was strong, and Cantenna was necessary to close the breach or otherwise Cantenna use prohibited on both sides (router and PC) with a sort of pipeline for radiowaves.
But my challenge was to create a very weak signal that needed strengthening, so I went with a different design, with a reflector to focus on a standard antenna. If only a small improvement of the signal is necessary, it follows from the Web, a flat metal reflector behind the antenna enough. But for something more challenging, a parabolic reflector curve is necessary. Technology clincher is that my contact with Bill (an avid amateur, Ohio)decided to go for a parabolic design for what I wanted to do, rather than Cantenna.
Antenna Design
More local design tips, all useful. Ultimately I decided to make a USB WiFi dongle for sale, with an antenna connector, and a large outdoor antenna, a "rubber and a maximum gain of the signal before the reflector. Reflector Would aluminum foil glued to a management structure curved -mountantenna.
The building that I used two types of cards. For the curved reflector, I briefly that was hard, but can be bent into a curve with no creases or cracks. I have a piece of paper used for image processing, about 1.5 mm thick (1 / 16). To support three crescent-shaped, briefly, that is fixed and can not be bent. I used corrugated cardboard from a box, about 3 mm (1 / 8 ").
The shape of the reflector, I used a parabolicCalculator freeware program. I have my desired size in hundredths of a millimeter, for example. Diameter = 30,000 (300mm for example, about 12 ") since the program only works with integers. I wanted the focus to about 6150 (61.50 mm), half of a wavelength of 2.4 (not I'm sure the logic of adjusting, but I think the reflection corresponding to the input signals to focus, rather than disturb him) Then I set the depth of 9146 (eg, 91.46 mm), this to get attention .. His relationshipFocus has a diameter of 0.2 (I read a web page, ideally this relationship should be between 0.3 and 0.6, but I wanted a good diameter for weak signals) program creates a table of point values from a graphic model calculations paper.parabola I also noticed the focal point is the point of the parabola to focus its signal collection.
I use graph paper template to mark and cut three supports drill a hole in each of the focus.Why was the rubber mount and the antenna which is thinner on top, I take less for the upper support. I also have a rectangular strip in the left-most tab, but the crescent, which is necessary if the structure can be strengthened. I also have an additional strip glued here for every piece makes it thicker / stiffer – but I felt it was "over-engineering!
Then I cut the rectangle to the back corner, and two weeks form the support to adjust. Mosttime, I was caught in a library that books gradually making it more curved shape and adapt. Once the form correctly, I glued the curved back support, with the antenna in place to ensure that all lined up. I have the whole band a lot, to be sure, while the glue is dry (I use a glue solvent "Evostik" in case of impact with the water based on the map).
Over the last step was to glue a sheet of aluminum on the back of the curved shape, with a very thinadhesive layers. maps, finally, I glued a view 'at the top of the meeting, so my aim was more accurate in my distant radio source.
Tests and results
The addition of the reflector has a significant improvement in some signs and went into other signals that have never seen before, especially when I experiment with the adjustment (see horizontal vertical) and direction. In reality it was very sensitive to the direction – just a few degrees can make a bigThe difference with the received signal. I use mainly inSSIDer the signal that is useful as a graphic when they go, easier to see how they change, will provide a signal that is experienced tailor.
At home, where at least I have broadband, I could assemble an unprotected Wi-Fi, already out of reach, and go online. So the conclusion is that the principle of interception are useful in wireless system outside the normal range. Unfortunately, the original aim was notreached, because it brings restaurant in diversity! I think I hoped too much of a hole of 200 yards in diameter. I make a new reflector with a greater width, but postage is a problem, and the idea of taking a giant antenna with a hotel receipt …
Copyright Michael D Mitchell
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