Foreshortened dipole antenna with triangular radiators
First Claim
1. A log periodic antenna having a maximum width, W, and comprising:
- a first group of triangular dipoles having substantially mutually equivalent base-to-height ratios,a linear dipole having a length substantially equal to W; and
a second group of triangular dipoles interposed between the first group of triangular dipoles and the linear dipole and having respective base-to-height ratios that decrease in the direction from the first group of triangular dipoles to the linear dipole.
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Accused Products
Abstract
A foreshortened log periodic antenna includes variously configured dipole elements which are arranged in four regions along the axis of the array. The first region includes a series of solid, triangular dipoles characterized by substantially constant base/height ratios. The second region similarly includes a series of solid, triangular dipoles. However, these elements are characterized by decreasing base/height ratios so as to afford a gradual transition into the third region, which includes a single linear dipole. The fourth region includes a series of solid or hollow rectangular elements connected by respective stems to the antenna feedline. In a manner set forth in U.S. Pat. No. 3,732,572, entitled "Log Periodic Antenna with Foreshortened Dipoles", the rectangular elements effect a reduction in the width of the array without a substantial affect on electrical performance.
102 Citations
25 Claims
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1. A log periodic antenna having a maximum width, W, and comprising:
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a first group of triangular dipoles having substantially mutually equivalent base-to-height ratios, a linear dipole having a length substantially equal to W; and a second group of triangular dipoles interposed between the first group of triangular dipoles and the linear dipole and having respective base-to-height ratios that decrease in the direction from the first group of triangular dipoles to the linear dipole. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A log periodic dipole antenna comprising a feed line to which is attached a plurality of dipole elements, the elements arranged in at least three regions along the length of the feedline, wherein the three regions include:
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a first region comprising a series of triangular dipoles characterized by a substantially constant base/height ratio; a second, transition, region comprising a series of triangular dipoles characterized by a gradually decreasing base/height ratio; and a third region comprising at least one linear dipole. - View Dependent Claims (16)
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17. A foreshortened log periodic antenna comprising a feedline to which are attached a plurality of dipole elements, the elements arranged in four regions along the length of the feedline so as to include:
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a first region comprising a series of solid triangular dipoles characterized by substantially constant base/height ratios; a second region comprising a series of solid triangular dipoles characterized by decreasing base/height ratios; a third region comprising at least one linear dipole; and a fourth region comprising a series of foreshortened dipoles. - View Dependent Claims (18, 19)
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20. A foreshortened log periodic antenna comprising a feedline to which are attached a plurality of dipole elements, the elements arranged in four regions along the length of the feedline so as to include:
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a first region comprising a series of solid triangular dipoles characterized by substantially constant base/height ratios; a second region comprising a series of solid triangular dipoles characterized by decreasing base/height ratios; a third region comprising at least one linear dipole; and a fourth region comprising a series of foreshortened dipoles, each of the foreshortened dipoles comprising a generally rectangularly perimetered body portion attached through a stem portion to the feedline. - View Dependent Claims (21, 22, 23, 24, 25)
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Specification