Amateur radio hf fractal antenna

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QRZ Forums. I believe it was an Amateur radio guy that helped the devolopment of the fractal antenna, which is what every cell phone uses today. Since it is very broadband antenna and can be made multiband also, is it practical for HF work?

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Fractal antennas are aerials whose design is based on the fractal geometric shape, typically generated by computer programs, feature a compact size, wideband and good performances. These antennas are usually flat and are used mainly in very high frequencies, therefore are ideal for use in mobile, military and security applications. HF Fractal antennas offer a very compact size, a good performance and a large bandwidth, but are very unusual aerials.

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Call Search. New to Ham Radio? My Profile.

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New To HF? Ham Radio News! Ham Radio Videos!

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Fractals are more than just intricate shapes and appealing pictures. They encompass our lives, appearing in places as tiny as blood vessels and as widespread as the patterns of tree branches. Yet, what is a fractal?

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Before the HRS antenna became the default design for high power broadcasting in the s, Sterba curtains were used. Sterba curtains are modest-gain single-band curtain array antennas. They are named after Ernest J.

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One reason this is interesting is because of the possible role of charge transfer in the DNA repair mechanism. See the work of Jacqueline Barton's group at Caltech [1] for more information. Here was how it was described when she was awarded the National Medal of Science: "For discovery of a new property of the DNA helix, long-range electron transfer, and for showing that electron transfer depends upon stacking of the base pairs and DNA dynamics.

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It is used for military and paramilitary communications, broadcasting, [1] especially in the tropics, and by radio amateurs for nearby contacts circumventing line-of-sight barriers. The radio waves travel near-vertically upwards into the ionospherewhere they are refracted back down and can be received within a circular region up to km miles from the transmitter. There is no fundamental difference between NVIS and conventional skywave propagation; the practical distinction arises solely from different desirable radiation patterns of the antennas near vertical for NVIS, near horizontal for conventional long-range skywave propagation.

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The Symphony-SP represents a material improvement to existing solutions, delivering wideband coverage in a highly reduced size and weight. And this coverage comes in a surprisingly small package. FRACTAL today announced upcoming issuance of a fundamental patent on unidirectional antennas, that replace existing applications with smaller, more versatile and visually pleasing options and form factors. The new fractal metamaterial technology offers a superior alternative to Yagi-Uda antennas.

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