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His research group at Harvard spent the 1940s and 1950s developing the theory of antenna, using the cylindrical antenna as a boundary value problem subject to Maxwell's equations. Also, scattering and diffraction of electromagnetic waves from spheres, cylinders, strips, and disks, conducted within earth, under water or in tissue. [ 5 ]
Friis' original idea behind his transmission formula was to dispense with the usage of directivity or gain when describing antenna performance. In their place is the descriptor of antenna capture area as one of two important parts of the transmission formula that characterizes the behavior of a free-space radio circuit.
Forms of the reciprocity theorems are used in many electromagnetic applications, such as analyzing electrical networks and antenna systems. [1] For example, reciprocity implies that antennas work equally well as transmitters or receivers, and specifically that an antenna's radiation and receiving patterns are identical.
He has authored multiple books on antenna and microwave engineering, including Antenna Design Using Personal Computers (1985), Microwave Engineering (1990) and Microwave and RF Design of Wireless Systems (2000). [2] [3] Pozar introduced the widely used printed antenna feed techniques of aperture coupling [5] in 1984 and proximity coupling in ...
Antenna directivity is the ratio of maximum radiation intensity (power per unit surface) radiated by the antenna in the maximum direction divided by the intensity radiated by a hypothetical isotropic antenna radiating the same total power as that antenna. For example, a hypothetical antenna which had a radiated pattern of a hemisphere (1/2 ...
In radio propagation, horizontal plane is used to plot an antenna's relative field strength in relation to the ground (which directly affects a station's coverage area) on a polar graph. Normally the maximum of 1.000 or 0 dB is at the top, which is labeled 0 o, running clockwise back around to the top at 360°. Other field strengths are ...
International Journal of Antennas and Propagation is a peer reviewed, scientific open access journal that publishes original and review articles in all areas of antennas and propagation. The editor-in-chief is Slawomir Koziel.
Author: farnaz: Short title: Pages from 6661_Master_2004-3.p.PDF: Date and time of digitizing: 23:22, 29 March 2004: File change date and time: 23:22, 29 March 2004