![]() ![]() It is not easy to find 16 mm drill bits in the UK, so we bought a 20 mm cone cutter. We calculated from this the value for 1/4 L g (a quarter of the standing wavelength inside the can), measured this far up from the bottom of the can and drilled a small pilot hole, then drilled the hole out large enough for a chassis mount N-type connector. Constructionįirst we selected a can with a diameter of 96 mm. Also the larger the area of the mouth of the can, the more energy can be tranferred, so the greater the received and transmitted signal. ![]() This suggests the larger acceptable diameters should be used so the can may be shorter. The smaller the diameter, the longer the guide wavelength. Tables of values below) and is dependent upon the diameter of the can. The ARRL (Amateur Radio Relay League) say that the required waveguide length is at least two guide wavelengths - The guide wavelength is the value of L g (in the See appendix for a list of cans found suitable so far. performance will diminish increasingly beyond these sizes.įrom practical use we have found that strength is a good virtue, and a fitting plastic lid is almost a must for waterproofing. These are not a "brickwall" limits, but rather roll-off points. For 2.4 GHz the calculations indicate that the can should have a diameter between 70 mm (millimetres) and 100 mm. The dipole-less " yagi" bit inside is fiddly to make, and initial tests show the waveguide cans to work better.įrom studies of waveguide theory, which gets complicated, it seems that a waveguide antenna or "can-tenna" should have parallel sides, be a good conductor, preferably shiny, and the end needs to be be perpendicular to the sides. The Pringle's can, being cardboard, does not last long in a storm, and it is very hard to affix connectors securely. This was evolved primarily since the Pringle's can antenna. It is not for FM / AM / SW / LW radio useage. Note - This antenna is for use with 802.11b or 802.11g wireless computer networks or 2.4 GHz video sending equipment. One of the antennas made from a J&B whiskey tin. All that was required was fitting, in the correct place, a driven element consisting of a short piece of copper wire soldered into the centre of an N-type connector. We have been experimenting with waveguide antenna, made from old food cans, to massively extend the range of 802.11b wireless networks. Calculate dimensions from a table of values.Latest version of this document | More articles Waveguide Antenna 2.4 GHz for 802.11b (WiFi) WLAN Circular Waveguide Antenna for 2.45 GHz / 802.11b / WiFi / WLAN ![]()
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