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Log-periodic-monopole-antenna

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Log-periodic monopole antenna

Details

Inventors: Barbano, Normand; Kuo, Samuel C.;
Assignee: GTE Products Corporation (Stamford, CT)
Primary Examiner: Lieberman; Eli
Assistant Examiner:
Attorney, Agent or Firm: Lawler; John F.

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.

DETAILED DESCRIPTION What is claimed is: 1.
A balanced-fed log-periodic vertically polarized monopole antenna comprising first and second angularly spaced arrays proximately spaced from and on the same side of an electrically conductive ground plane, each of said arrays comprising a plurality of longitudinally spaced radiating elements and interelement connector lines connecting said elements in series, said elements of each array extending in a direction away from and in a plane normal to said ground plane, each of said elements being open at the inner end proximate to the ground plane and closed at the outer end remote from the ground plane, the elements of each of said arrays having dimensions which progressively increase from one end to the other in progressive increments of a predetermined ratio, the space between adjacent elements of one of said arrays being opposite an element of the other of said arrays, and means to connect said one ends of said arrays to a balanced feed source.
2.
The antenna according to claim 1 in which each of said arrays comprise an electrically continuous wire-like conductor.
3.
The antenna according to claim 1 in which the interelement spacing of each array progressively increases from said one end in increments of said predetermined ratio, the width of the space between adjacent elements of one array being equal to the width of the opposite element of the other array.
4.
The antenna according to claim 3 in which the planes of said arrays diverge from each other from said one ends thereof, said connector lines of said arrays lying in a plane diverging from said ground plane from said one ends of the arrays.
5.
The antenna according to claim 3 in which each of said elements has two sides connected to the adjacent connector lines, respectively, and disconnected from each other adjacent to the ground plane.
6.
The antenna according to claim 5 in which said element sides are parallel, and a conductive jumper interconnecting the ends of said sides of each element remote from said line conductor

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