Communications: radio wave antennas – Antennas – Logarithmically periodic
Patent
1987-06-15
1988-11-15
Sikes, William L.
Communications: radio wave antennas
Antennas
Logarithmically periodic
343878, 343879, H01Q 1110
Patent
active
047853077
ABSTRACT:
A crossed log-periodic dipole antenna having a unique feedline/boom structure providing improved antenna performance. The antenna is assembled from a pair of orthogonally displaced log-periodic antennas each having a pair of half-dipole structures, each structure having a half-dipole assembly and a central feed boom. The half-dipole assembly comprises a single sheet of conducting material formed to provide a central boom portion and a plurality of half-dipole elements projecting radially from opposite sides of the boom. The boom portion has a reduced thickness, a shape which complements that of the outer surface of the boom, and is press-fitted against and bonded to the boom exterior to form an integrated rigid unit. This configuration minimizes the force required to connect each half-dipole assembly with the adjacent boom, decreases the offset distance between the two dipole halves of each antenna, and reduces the electrical shadowing effect of the booms on the antennas.
The invention also comprehends a method of making such an antenna.
REFERENCES:
patent: 2888677 (1959-05-01), Masters
patent: 3500423 (1970-03-01), Church
patent: 3683392 (1972-08-01), White
Gilbert Douglas M.
GTE Government Systems Corporation
Lawler John F.
Le Hoang-anh
Sikes William L.
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