Antennas -- in 50 Minutes or Less!. Cynthia Furse Department of Electrical and Computer Engineering Utah State University [email protected] Introduction to Antennas. Antenna Parameters Types of Antennas Where to find out more. Antenna Parameters. Radiation Pattern Directivity Gain
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SENSOR SYSTEMS L1
SENSOR SYSTEMS L1 WITH CHOKE RING
Two Elements -- Pattern adds
constructively or destructively
Changing the phases on the element
feeds can make a scanning array.
HAARP (High frequency Active Auroral Research Program) is to be a major Arctic facility for upper atmospheric and solar-terrestrial research. HAARP is being built on a DoD-owned site near Gakona, Alaska.
The HF antenna system to be used for Active Ionospheric Research at the HAARP site will assist other facility instruments in the study the overhead ionosphere. As a result, it too has been designed to optimize or restrict the transmission pattern to lie within a narrow overhead region. To achieve this desirable antenna pattern, the HAARP system uses an "array" of individual antenna elements. The HAARP antenna array is similar or identical to many other types of directive antenna types in use for both military and civilian applications including air traffic control radar systems, long range surveillance systems, steerable
communication systems and navigation systems.
Lowe Industries :http://www.lowe.co.uk/antrev2.htmlhttp://www.lowe.co.uk/antrev2.html
Antenna Calibration: http://gracie.grdl.noaa.gov/GRD/GPS/Projects/ANTCAL/index.shtml
North Country Radio: http://www.northcountryradio.com/techtips.htm
Antenna Elmer: http://www.qth.com/antenna/antenna.htm
HAARP Observatory: http://server5550.itd.nrl.navy.mil/projects/HAARP/ant3.html
Arecibo Obervatory: http://www.naic.edu/aboutao.htm