Communications: radio wave antennas – Antennas – Logarithmically periodic
Patent
1987-02-26
1988-08-09
Sikes, William L.
Communications: radio wave antennas
Antennas
Logarithmically periodic
343793, 343807, 343811, H01Q 1110
Patent
active
047631317
ABSTRACT:
In a log-periodic monopole antenna array of the type described in U.S. Pat. No. 3,286,268, each antenna of the array having active elements spaced over the top surface of a ground structure and grounded parasitic elements interspersed between the active elements, the improvement of means for mechanically and electrically connecting the parasitic elements to a non-solderable ground structure comprising an elongated block compressed into a correspondingly shaped groove in the structure. Screw means threadedly engage the ground structure in a direction transversely of the top surface thereof and abut against the block. The lower strip portion of the parasitic elements is disposed in the groove between the block and a groove side wall and is compressed therebetween when the screw means is tightened into the structure and against the block. In one embodiment, one side of the block and the adjacent side of the groove are tapered toward the opposite side of the groove so as to force the block against the strip when the screw means is tightened. In another embodiment the block abutting surface of the head of the screw means is tapered and forces the block against the strip when the screw means is tightened. A tight mechanical and electrical connection of the parasitic element strip portions in the array of antennas is thus achieved in a minimum of space.
REFERENCES:
patent: 2480154 (1949-08-01), Masters
patent: 2869125 (1959-01-01), Bouchard
patent: 3056960 (1962-10-01), Wickersham
patent: 3101474 (1963-08-01), Wickersham
patent: 3123827 (1964-03-01), Arnold
patent: 3286268 (1966-11-01), Barbano
patent: 3308470 (1967-03-01), Bell
patent: 3396399 (1968-08-01), Winegard
patent: 3427659 (1969-02-01), Finneburgh
Bird Gustavo E.
Davis Robert E.
Kuo Samuel C.
Rosser William D.
Gilbert Douglas M.
GTE Government Systems Corporation
Lawler John F.
Le Hoang-anh
Sikes William L.
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