Search results
Results from the WOW.Com Content Network
A. A. Oliner (principal investigator), Lumped-Element and Leaky-Wave Antennas for Millimeter Waves, Final Report on RADC Contract No. F19628-81-K-0044,Polytechnic Institute of New York, 1984. F. J. Zucker, "Surface and leaky-wave antennas," Chapter 16 of Antenna Engineering Handbook, H. J. Jasik, Editor, McGraw-Hill, New York, 1961.
The most common monopole is a vertical, 1 / 4 wave tall, which is the minimum size for it to self-resonate. [n] A one-quarter wave monopole has a gain of 5.12 dBi when mounted over a good ground plane.
This means that for example a 1 / 4 wave antenna at 27 MHz is 2.7 m (110 inches; 8.9 feet) long and is physically quite unsuitable for mobile applications. The reduced size of a helical provides the same radiation pattern in a much more compact physical size with only a slight reduction in signal performance.
Often random wire antennas are also (inaccurately) referred to as long-wire antennas.There is no accepted minimum size, but actual long-wire antennas must be greater than at least a quarter-wavelength ( 1 / 4 λ) or perhaps greater than a half ( 1 / 2 λ) at the frequency the long wire antenna is used for, and even a half-wave may only be considered "long-ish" rather than "truly ...
The length of a whip antenna is determined by the wavelength of the radio waves it is used with. Their length varies from compact electrically short antennas 1 / 10 wavelength long, up to 5 / 8 wavelength to improve directivity. The most common type is the quarter-wave whip, which is approximately 1 / 4 wavelength long.
American Teacher is a feature-length documentary created and produced by The Teacher Salary Project. Following the format of the book Teachers Have It Easy: The Big Sacrifices and Small Salaries of America’s Teachers, the film utilizes a large collection of teacher testimonies and contrasts the demands of the teaching profession alongside interviews with education experts and education ...
Lehigh Career and Technical Institute (LCTI) is a career and technical institute located in Schnecksville, Pennsylvania in the Lehigh Valley region of eastern Pennsylvania. It is one of the largest career and technical institutes in the United States. LCTI has a variety of programs offered to all of its students, and also offers an academic option.
For instance, if a radio wave passing a given location has a flux of 1 pW / m 2 (10 −12 Watts per square meter) and an antenna has an effective area of 12 m 2, then the antenna would deliver 12 pW of RF power to the receiver (30 microvolts RMS at 75 ohms). Since the receiving antenna is not equally sensitive to signals received from all ...