#Omnidirectional vlf receiver antenna tv#

Nearly isotropic antennas are used as reference antennas for testing other antennas and for field strength measurements, and for backup antennas on satellites which work without the satellite being oriented towards a communication station.ДЄn 'isotropic antenna' should not be confused with an ' omnidirectional antenna' an isotropic antenna radiates equal power in all three dimensions, while an omnidirectional antenna radiates equal power in all horizontal directions, with the power radiated varying with elevation angle, but decreasing to zero along the antenna's vertical axis.Д¬orner reflector UHF TV antenna with 'bowtie' dipole driven element at its center The smaller the antenna, the more nearly isotropic it will be. Nearly isotropic antennas can be constructed using multiple small elements, and regardless of type, any antenna very much smaller than a wavelength (say, в‰І 1 / 16 wave) will be approximately isotropic.

No real antenna can produce a truly isotropic radiation pattern, but the isotropic radiation pattern serves as a 'worst case' reference for comparing the degree to which other antennas, regardless of type, can project radiation in one direction.

It is a mathematical model that is used as the base of comparison to calculate the directionality or gain of real antennas. 19, 1934 532,164 Great Britain Jan.An isotropic antenna ( isotropic radiator) is a hypothetical antenna that radiates equal signal power in all directions. 5, 1950 FOREIGN PATENTS Number Country Date 362,530 Great Britain Dec. References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 2,280,562 Weagant Apr.

H01Q7/00- Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop.

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Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Application filed by Toth Emerick filed Critical Toth Emerick Priority to US209502A priority Critical patent/US2690509A/en Application granted granted Critical Publication of US2690509A publication Critical patent/US2690509A/en Anticipated expiration legal-status Critical Status Expired - Lifetime legal-status Critical Current Links Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Lifetime Application number US209502A Inventor Toth Emerick Original Assignee Toth Emerick Priority date (The priority date is an assumption and is not a legal conclusion.

#Omnidirectional vlf receiver antenna pdf#

Google Patents Omnidirectional loop antenna systemДownload PDF Info Publication number US2690509A US2690509A US209502A US20950251A US2690509A US 2690509 A US2690509 A US 2690509A US 209502 A US209502 A US 209502A US 20950251 A US20950251 A US 20950251A US 2690509 A US2690509 A US 2690509A Authority US United States Prior art keywords antenna circuit coupling circuits frequency Prior art date Legal status (The legal status is an assumption and is not a legal conclusion.

Google Patents US2690509A - Omnidirectional loop antenna system US2690509A - Omnidirectional loop antenna system