» Building Antenna 2.4 GHz Double Quad
1. Double Quad (Bow Tie)
* A compact directional antenna useful for workshop and hand-held operation
* Fair gain (14 dBi)
* Wide bandwidth (full 802.11b/g spectrum)
* More compact than Yagi or circular waveguide types of equivalent gain
* Fits a wide range of microwave cooking food containers
* Ideal as a feed to a standard domestic satellite dish
* Liberal mechanical tolerances
* useful as reference antenna
* Easy to replicate (- but do use correct gauge wire and thickest & best microwave coax you can afford !)
* Can use a 120mm CD as a reflector with slightly diminished performance at 2.4GHz
* Can omit the "Sleeve Balun" for ordinary Wi-Fi use
* Scalable for many frequencies
* See equally practical other variants on this page..
Originally from a German Amateur Radio Microwave Compendium design concept of the 1980's this
antenna concept has proven popular for broadband Amateur TV and I have made examples of these from 600MHz to 6GHz.
It exploits the 6dB gain from solid plane reflector (not everyone knows that ! )
Henry - G8OTA
You can utilize salvage your TV satellite dish, to make this antenna.
Author: Trevor Marshall
"That's all there is to it, folks -- you now have a dish with 27-31 dBi of gain and negligable sidelobe radiation (<40dB). The beamwidth is about 4 degrees."
http://trevormarshall.com/biquad.htm
* A compact directional antenna useful for workshop and hand-held operation
* Fair gain (14 dBi)
* Wide bandwidth (full 802.11b/g spectrum)
* More compact than Yagi or circular waveguide types of equivalent gain
* Fits a wide range of microwave cooking food containers
* Ideal as a feed to a standard domestic satellite dish
* Liberal mechanical tolerances
* useful as reference antenna
* Easy to replicate (- but do use correct gauge wire and thickest & best microwave coax you can afford !)
* Can use a 120mm CD as a reflector with slightly diminished performance at 2.4GHz
* Can omit the "Sleeve Balun" for ordinary Wi-Fi use
* Scalable for many frequencies
* See equally practical other variants on this page..
Originally from a German Amateur Radio Microwave Compendium design concept of the 1980's this
antenna concept has proven popular for broadband Amateur TV and I have made examples of these from 600MHz to 6GHz.
It exploits the 6dB gain from solid plane reflector (not everyone knows that ! )
Henry - G8OTA
2. Bi Quad Feed for Primestar Satellite Dish
"That's all there is to it, folks -- you now have a dish with 27-31 dBi of gain and negligable sidelobe radiation (<40dB). The beamwidth is about 4 degrees."
http://trevormarshall.com/biquad.htm
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