Helical antenna having a solid dielectric core
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United States of America Patent
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Dec 29, 1998
Grant Date -
N/A
app pub date -
Dec 6, 1994
filing date -
Aug 25, 1994
priority date (Note) -
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Abstract
An antenna for use at UHF and upwards has a cylindrical ceramic core with a relative dielectric constant of at least 5. A three-dimensional radiating element structure, consisting of helical antenna elements on the cylindrical surface of the core and connecting radial elements on a distal end face of the core, is formed by conductor tracks plated directly on the core surfaces. At the distal end face the elements are connected to an axially located feed structure in a plated axial passage of the core. The antenna elements are grounded on a plated sleeve covering a proximal part of the core which, in conjunction with the feeder structure, forms an integral balun for matching to an unbalanced feeder.
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