Log-periodic monopole antenna

Details Log-periodic monopole antenna Log-periodic monopole antenna

1979-02-26

1981-08-25

Lieberman, Eli

Communications: radio wave antennas

Antennas

Logarithmically periodic

343846, H01A 1110

Patent

active

042862710

ABSTRACT:
A vertically-polarized log-periodic monopole antenna comprises two closely spaced arrays of elements over a ground plane and connected to a balanced feed source, i.e, the arrays are separately excited out of phase by the source. The elements of each array taper from minimum dimensions at the feed end to maximum at the other end in progressive increments of a predetermined ratio .tau. and are open at their inner ends proximate to the ground plane. Each array preferably comprises an electrically continuous wire-like conductor configured to define the profile of the elements and to constitute the interelement connecting lines. Preferred shapes of the elements are trapezoidal, pseudo-trapezoidal and triangular. The antenna provides very broadband (20 to 750 MHz) frequency independent performance at minimum VSWR (<2.0 to 1) and has non-critical design parameters.

REFERENCES:
patent: 2977597 (1961-03-01), Du Hamel et al.
patent: 3271775 (1966-09-01), Yang
patent: 3355740 (1967-11-01), Mayes
patent: 3383693 (1968-05-01), Kahn et al.
patent: 3696430 (1972-10-01), Cory et al.

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