Log-periodic slot antennas

Details Log-periodic slot antennas Log-periodic slot antennas

1989-01-13

1990-05-01

Hille, Rolf

Communications: radio wave antennas

Antennas

Slot type

3437925, H01Q 1110

Patent

active

049222627

ABSTRACT:
A log-periodic slot antenna has adjacent radiating elements connected by off-center co-planar lines thereby providing the required phase reversal and modifying the element impedance to match that of the co-planar line. By providing a ground plane restricted in size to that of the element array a difference pattern can be formed by the single antenna giving a sharp null in the longitudinal direction of the antenna. A dual log-periodic antenna formed from two such single antennas can be fed in-phase and produce two difference patterns one in the co-planar plane and one in the cross-polar plane.

REFERENCES:
patent: 3369243 (1968-02-01), Greiser
patent: 3633207 (1972-01-01), Ingerson et al.
patent: 3696438 (1972-10-01), Ingerson
patent: 4594595 (1986-06-01), Struckman
Ingerson et al., "Log-Periodic Antennas with Modulated Impedance Feeders", IEEE Trans. on Antennas and Prop., vol. AP-16, No. 6, Nov. 1968, pp. 633-642.
"Millimeter Wave Engineering and Applications" by P. Bhartia and I. J. Bahl, A Wiley-Interscience Publication, 1984.

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