Communications: radio wave antennas – Antennas – Logarithmically periodic
Patent
1987-12-14
1990-03-06
Hille, Rolf
Communications: radio wave antennas
Antennas
Logarithmically periodic
343802, 343807, H01Q 1110
Patent
active
049070118
ABSTRACT:
A foreshortened log-periodic antenna which includes variously configured dipole elements and a tapered feedline is disclosed. The dipole elements are arranged in four regions. A first region, located nearest to a feed end of the antenna, includes solid triangular dipoles having constant base-to-height ratios. A second region, adjacent to the first region, includes solid triangular dipoles having decreasing base-to-height ratios. A third region, located adjacent to the second region, includes a single linear dipole. A fourth region, located adjacent to the third region and nearest to a low frequency end of the antenna, includes foreshortened dipoles. The feedline may be implemented either in coaxial or microstrip form so that a lower characteristic impedance is pressed at the feed end of the antenna than at the low frequency end of the antenna. Specifically, for a coaxial feedline having individual conductors separated by a distance "d" at the feed end of the antenna, the individual conductors taper relative to each other so that they are separated by a distance of 2d-5d at the low frequency end of the antenna.
REFERENCES:
patent: 2981951 (1961-04-01), Wickersham et al.
patent: 3123827 (1964-03-01), Arnold et al.
patent: 3134979 (1964-05-01), Bell
patent: 3543277 (1970-11-01), Pullara
patent: 3732572 (1973-05-01), Kuo
patent: 4673948 (1987-06-01), Kuo
patent: 4754287 (1988-06-01), Kuo
Kuo; "Size Reduce Log Periodic Dipole Array"; 1970, G-AP International Symposium; pp. 151-158; 1970.
Kuo; "Size Reduce Log Periodic Dipole Array Antenna"; Microwave Journal (GB); vol. 15, No. 12, pp. 27-33, 1972.
GTE Government Systems Corporation
Hille Rolf
Le Hoang-anh
Odozynski John A.
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