Communications: radio wave antennas – Antennas – With lumped reactance for loading antenna
Patent
1978-09-08
1980-06-10
Lieberman, Eli
Communications: radio wave antennas
Antennas
With lumped reactance for loading antenna
343822, 343882, H01Q 916
Patent
active
042075742
ABSTRACT:
A portable antenna construction is provided for high frequency radio transmission and reception. A physically and electrically shortened center-fed dipole, the antenna includes a driven element assembly 62, a center insulator assembly 60, a center loading coil assembly 74, two end loading coil assemblies 70 and 72, two capacity hat assemblies 64 and 68, and a mast assembly 63, each such assembly constructed from parts allowing for easy assembly and disassembly. The antenna further includes a carrying case 78 of sufficient size to hold all disassembled parts, so that such disassembled parts can be easily transported. Center loading coil assembly 74 includes a center loading coil 76 having multiple tap points 77 for transmission line connection, thereby permitted impedance match at any frequency to which the antenna is tuned. End loading coil assemblies 70 and 72 include end loading coils 71 and 73 respectively, each having multiple tap points, permit the antenna to be specifically tuned to resonate at the desired frequency. This linearly polarized antenna, requiring no ground and is easily pivoted between horizontal and vertical modes of polarization. When utilized in the vertical mode, the lower dipole half acts as an image counterpoise so that no ground plane is necessary. Large center 76 and end loading coils 71 and 73 provide high Q for maximum radiation at the tuned frequency.
REFERENCES:
patent: 2119692 (1938-06-01), Voigt
patent: 2563243 (1951-08-01), Hills
Lieberman Eli
Rosenberg Morton J.
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