Television antennas
First Claim
1. A television antenna exhibiting a bandwidth including the entire VHF and UHF broadcast bands, a low voltage standing wave ratio, and an essentially omnidirectional radiation pattern, the antenna comprisingpair of antenna elements configured as a dipole, each of the elements being formed as a sheet including an electrically resistive material, each sheet having a free end and a feedpoint end opposite the free end,the resistive material of each sheet being configured to define a pattern of voids and non-voids the voids and non-voids being arranged so that the resistance per unit length of the sheet increases with distance from the feedpoint.
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Abstract
A television antenna exhibiting a bandwidth including VHF and UHF, a low standing wave ratio, and an essentially omnidirectional radiation pattern. The antenna includes a sheet-like antenna element having a feedpoint, and an electromagnetic characteristic having non-uniform variation with distance from the feedpoint.
109 Citations
26 Claims
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1. A television antenna exhibiting a bandwidth including the entire VHF and UHF broadcast bands, a low voltage standing wave ratio, and an essentially omnidirectional radiation pattern, the antenna comprising
pair of antenna elements configured as a dipole, each of the elements being formed as a sheet including an electrically resistive material, each sheet having a free end and a feedpoint end opposite the free end, the resistive material of each sheet being configured to define a pattern of voids and non-voids the voids and non-voids being arranged so that the resistance per unit length of the sheet increases with distance from the feedpoint.
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24. A television antenna comprising
a pair of antenna elements configured as a dipole, each of the elements comprising a planar dielectric sheet bearing a coating of conductive material, the coating having a pattern of voids and non-voids that varies with distance along the element and, a balun connected to feed the pair of elements, the resistance per unit length of each of the antenna elements varying with distance along the element from its feed point as a result of the pattern.
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25. A television antenna exhibiting a bandwidth including the entire VHF and UHF broadcast bands, a low standing voltage wave ratio, and an essentially omnidirectional radiation pattern, the antenna comprising
a dipole pair of antenna elements, each of the elements being formed as a flat sheet of a resistive material having substantially uniform thickness, each of the elements having a feedpoint, the sheet having a pattern of voids of the resistive material arranged so that the resistance per unit length increases with distance along the element from the feedpoint, and the pattern of voids includes reduced thickness areas in the sheet where the resistance per unit length of the sheet at points along the sheet is controlled by arrangement of the size and quantity of void areas in the sheet.
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26. An antenna comprising
an antenna element being formed as a sheet, including electrically resistive material having a predetermined resistance per unit length, the sheet having a free end and a feedpoint end opposite the free end, the resistive material of the sheet being configured to define a pattern of voids and non-voids being arranged to provide the sheet with a resistance per unit length having a magnitude which varies along the antenna element from its feedpoint end.
Specification