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Crossed-Field Antenna

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The cross-field antenna is an advanced design patented in Egypt.

Patent holder: Kabbary Antenna Technology Co. (CrossedFieldAntenna.com)

URL: http://www.crossedfieldantenna.com/
The Crossed Field Antenna CFA has been evolved from Aberdeen, Scotland in1986 .
The CFA was approved by Ofcom/Arqiva , as better than the quarter monopole , ( report is included ).
The CFA is extremely small antenna , efficient and independent on wave length.
The CFA operation is based on New Theory The CFA has solved many antenna problems.
Retrieved from http://www.crossedfieldantenna.com/ — 20:18, 12 February 2011 (MST)


Excerpt: Antennex.com

THE CROSSED-FIELD-ANTENNA — PART I

“a completely new concept in antenna theory ”

by Maurice C. Hately (GM3HAT) and Ted Hart (W5QJR)
“One significant engineering application, only fully realized through the reversed form of Maxwell's 4th equation, has been the recent development of revolutionary antenna systems called crossed-field-antennas (CFA) which synthesize directly the Poynting Vector S = E X H from separately stimulated E (electric) and H (magnetic) fields. S is electromagnetic radiation, thus this says there are two (2) components to the radiated field, E and H. The X is defined as the cross product, meaning that they must be properly related both in time, phase, and position. In other words, if you can separately create the two fields and properly combine them, you don't have to have a piece of wire carrying a current. Because of this, A fundamental feature of these antennas is that the physical size of the structure is small and also independent of the radiated wavelength, a truly remarkable concept in relation to present day antenna theory and design techniques. (Frame that and hang it on the wall).

Source: Antennex.com (http://www.antennex.com/preview/cfa/cfa.htm)

Crossed field antenna

Wikipedia.org
http://en.wikipedia.org/wiki/Crossed_field_antenna
“A crossed field antenna, or CFA, is a type of antenna for long and mediumwave broadcasting, patented in 1986, which was claimed to have the same efficiency as a conventional antenna but only one-tenth the overall height. The invention was received with incredulity from experts in electromagnetics and antenna technology owing to the deficient theoretical justifications offered and the lack of viable experimental verification.
The physical structure of a crossed-field antenna is:
  • A horizontal metal disc (or "D-plate") raised above and insulated from the ground plane;
  • A vertical hollow metal cylinder (or "E-plate") of smaller diameter than the disc, which it is mounted concentrically above and insulated from;
  • A metal lattice funnel (or "extended conical section") radiating above and outward from and connected to the top of the cylinder.

See also