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Radio-frequency (RF) engineering is a subset of electrical engineering involving the application of transmission line, waveguide, antenna, radar, and electromagnetic field principles to the design and application of devices that produce or use signals within the radio band, the frequency range of about 20 kHz up to 300 GHz. [1] [2] [3]
The second part of this article winds up the construction phase of the project and introduces the software. Robert Ward: 52/7: July 1981 Lumitron-4 light sequencer: Final construction and checkout and a fascinating light display. David L. Holmes: 52/7: July 1981 Satellite TV antenna: The 8-Ball—a satellite TV antenna you can build for under $750.
In 1924 he joined the Western Electric Company, and in 1925 became a research engineer at Bell Telephone Laboratories, where he helped develop short-wave radio receivers and field strength measuring equipment, and designed directional antennas for short-wave radio communication, including his celebrated rhombic antenna (1931).
Chahat specializes in antenna design and electromagnetic interference and compatibility (EMI/EMC) analysis for space missions. [8] He also works across a wide range of frequencies, from UHF to THz, applied in communications, RADAR, imaging systems, satellite communications antennas, wearable and flexible antennas, and antennas for remote sensing and radio astronomy.
He built amateur radio equipment in high school, a radio telescope for which he won second place at the 1997 International Science and Engineering Fair in Louisville, KY, and developed many radar sensors in college. He earned PhD (2007), [3] [6] MSc (2003), and BSc (2002) degrees in electrical engineering from Michigan State University. [3]
The two-element design gives modest directivity (about 2.0 dB) with a null towards the rear of the antenna, yielding a high front-to-back ratio: Gain up to 9.7 dBi can be achieved at 28 MHz. [3] Because the placement and size of the parasitic reflector both depend highly on wavelength, each Moxon antenna functions properly on the frequency band ...
In a directional antenna designed to project radio waves in a particular direction, the lobe in that direction is designed larger than the others and is called the "main lobe". The other lobes usually represent unwanted radiation and are called "sidelobes". The axis through the main lobe is called the "principal axis" or "boresight axis".
He attended high school in Stockton [1] then went to Leland Stanford University, graduating in 1903 with an Bachelors of Arts degree in electrical engineering. [1] [24] Austin married Eleanor Briggs on December 28, 1907, in New York City. [3] In 1919, Eleanor was killed (and Arthur injured) in an automobile accident on Massachusetts's Mohawk ...