DUAL BAND SLEEVE DIPOLE ANTENNA
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United States of America Patent
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app pub date -
Oct 30, 2001
filing date -
Oct 30, 2001
priority date (Note) -
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Abstract
An antenna comprising a center-fed coaxial dipole having a first element, configured as a whip and a second element having a first and second portion for transmitting/receiving in dual frequency bands. The first element, first portion and second portion having a length equal to one-quarter wavelength of the mid-range frequency of the frequency band. The first portion configured as an inner conductive cylindrical sleeve coaxially aligned with the whip. The second portion, an outer conductive cylindrical sleeve, coaxially aligned with inner sleeve. A coaxial conductor having an inner conductor electrically connected to the whip and an outer conductor connected to the second element. A coaxial choke axially aligned with the conductor, having a length of one-quarter wavelength of the mid-range frequency band, a first end of the choke connected to the outer conductor and a second end being spaced from the second element an equivalent distance as the choke length.
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