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Query: fractal
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A Quad Fractal Antenna for 20 meters band by F3DD -
An experimental fractal Quad antenna for 10 meter band project by AG1LE -
Solution to your OEM needs and can meet your design or vended antenna requirements for antennas from 400MHz to 10 GHz. -
Fractal Antennas are a new generation of multiband antennas for wireless communications. Based on a new design concept, fractal technology. -
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The aim of the project is test if fractal antennas can work acceptably on HF bands. -
Presents the construction of a 10-meter Fractal Quad Yagi (FQY) antenna, detailing the design principles and practical build steps. The article highlights the antenna's compact size, with elements measuring just over 4 feet per side, making it suitable for easy erection and rotation with a TV rotator. It claims an impedance close to 50 ohms, allowing direct feed with 50-ohm coax, and specifies a 3 dBd gain with a front-to-back ratio exceeding 25 dB. Bandwidth is reported at 500 kHz for less than 2:1 VSWR. The resource includes a segment chart (Fig. 1) illustrating the precise lengths for each wire segment of the driven element and reflector, noting adjustments for different wire diameters. Construction utilizes readily available materials such as #9 aluminum ground wire and plastic water pipe for spreaders. The author, _KF7BS_, describes fabricating the framework, bending the fractal elements, and mounting them, including modifications like adding a small stub for reflector tuning. A materials list is provided, detailing items like 40-ft rolls of #9 Radio Shack aluminum ground wire and 1/2-inch plastic water pipe. Scaling equations for the driven element are discussed for different frequencies, such as designing for the CW band. The article references _Chip Cohen NIIRV_'s_ original _Fractenna_ website as the inspiration for the design. -
Since they were first described by the French mathematician Benoit Mandelbrot in the mid-1970s, repeating geometric figures known as fractals have fascinated computer scientists, mathematicians and graphic artists. -
Remotely-Operated 1200 Baud AX.25 Narrowband Packet Radio and APRS on a Baofeng UV-5RA and Raspberry Pi 2 -
Observing how fractal antennas might exhibit characteristics that are correlated to their form by kb7qhc -
A course on fractals antennas theory provided by La Ecole nationale superieure de techniques avancees in France. Course is in French.