BiQuad 802.11b Antenna
11dBi, wide band
***Engadget builds and tests a BiQuad/Primestar combination ***
Miikka Raninen (OH3GPJ) builds and tests the biquad
Click here for details of Mark LaPierre's 1100ft link through forest canopy, and comparison with Pringles can performance.
Click here to link to Koen Weijand's page on using an 18inch dish and feed details
Link to my tutorial 'Antennas Enhance WLAN Security' from BYTE.com, October, 2001
Click here to read about the High Gain (15-17dBi) Slotted Waveguide WLAN antennas
Need a little bit more range for your cellphone? You can make a Biquad for 1900 MHz exactly the same as the one above, but start with a 304 mm long pice of wire, fold it into 8 arms approximately 39.5 and 38.5 mm long. The ground plane needs to be a little larger, use one about 160 mm (6.2 inches) square. If you don't have a coaxial RF input jack on your cellphone you can couple the signal into its existing antenna using a single quad as a matching stub. It's not perfect, but in practice it works well. Solder an alligator clip to either of the high voltage apex (39mm from the feed) of a single 152 mm loop, and clip that to the antenna stub you are currently using. Now you can put 100 ft of coax between your phone and use a roof antenna (the BiQuad) to operate even in fringe areas.
Link to my article 'Antennas Enhance WLAN Security' in BYTE.com, October, 2001
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