Broadband dipole antenna system having three collinear radiators
First Claim
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1. A broadband antenna having, in combination, three successive in-line cylindrical antenna elements comprising first, center, and third elements, with gaps defined between the first and center, and center and third elements;
- and coaxial feed-line means disposed along the elements with the inner line thereof extending across the gap between the first and center elements, and the outer line thereof extending along the center element to form a transmission line section therewith and then connecting with the third element, said outer line being insulated from said center element for radio frequency energy in the operating frequency band;
the length of the in-line elements being large compared with the cross-section of the elements.
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Abstract
This disclosure deals with a three-element unit array (or stacked groups of the same) that enables the use of very large length-to-diameter dipole elements to cover broad frequency bands, greater than 2:1 in frequency ratio, by novel feed structures exciting the element gaps.
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10 Claims
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1. A broadband antenna having, in combination, three successive in-line cylindrical antenna elements comprising first, center, and third elements, with gaps defined between the first and center, and center and third elements;
- and coaxial feed-line means disposed along the elements with the inner line thereof extending across the gap between the first and center elements, and the outer line thereof extending along the center element to form a transmission line section therewith and then connecting with the third element, said outer line being insulated from said center element for radio frequency energy in the operating frequency band;
the length of the in-line elements being large compared with the cross-section of the elements. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- and coaxial feed-line means disposed along the elements with the inner line thereof extending across the gap between the first and center elements, and the outer line thereof extending along the center element to form a transmission line section therewith and then connecting with the third element, said outer line being insulated from said center element for radio frequency energy in the operating frequency band;
Specification