Omnidirectional broadband antennas
First Claim
Patent Images
1. An omnidirectional broadband antenna comprising:
- a ground element;
an antenna element electrically isolated from the ground element, the antenna element having at least one portion that is substantially conical, that has a substantially hexagonal pyramidal shape, or that tapers in a longitudinal direction; and
an annular patch element electrically grounded to the ground element, the annular patch element surrounding at least a portion of the antenna element and parasitically coupled to the antenna element;
wherein the antenna is vertically polarized and operable at frequencies between about 380 MHz and about 6000 MHz with a voltage standing wave ratio (VSWR) less than or equal to about three to one (3;
1), whereby the annular patch antenna element is configured to be operable as a λ
/4 wave trap for an operating frequency band of 400 MHz to thereby broaden bandwidth.
2 Assignments
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Accused Products
Abstract
Disclosed are exemplary embodiments of omnidirectional broadband antennas. In an exemplary embodiment, an antenna generally includes a ground element, an antenna element, and an annular patch element. The antenna element may be electrically isolated from the ground element. The antenna element may include at least one portion that is substantially conical, substantially pyramidal, and/or that tapers in a longitudinal direction. The annular patch element is electrically grounded to the ground element. The annular patch element surrounds at least a portion of the antenna element and is parasitically coupled to the antenna element.
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Citations
20 Claims
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1. An omnidirectional broadband antenna comprising:
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a ground element; an antenna element electrically isolated from the ground element, the antenna element having at least one portion that is substantially conical, that has a substantially hexagonal pyramidal shape, or that tapers in a longitudinal direction; and an annular patch element electrically grounded to the ground element, the annular patch element surrounding at least a portion of the antenna element and parasitically coupled to the antenna element; wherein the antenna is vertically polarized and operable at frequencies between about 380 MHz and about 6000 MHz with a voltage standing wave ratio (VSWR) less than or equal to about three to one (3;
1), whereby the annular patch antenna element is configured to be operable as a λ
/4 wave trap for an operating frequency band of 400 MHz to thereby broaden bandwidth. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. An omnidirectional broadband antenna comprising:
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a ground element; an antenna element electrically isolated from the ground element, the antenna element having at least one portion that is substantially conical, that has a substantially hexagonal pyramidal shape, or that tapers in a longitudinal direction; and an annular patch element electrically grounded to the ground element, the annular patch element surrounding at least a portion of the antenna element and parasitically coupled to the antenna element, wherein; the antenna is configured for mounting to a ceiling inside of a building; and the antenna is vertically polarized and operable at a range of operating frequencies between about 380 MHz and about 6000 MHz with a voltage standing wave ratio (VSWR) less than three to one (3;
1), whereby the annular patch antenna element is configured to be operable as a λ
/4 wave trap for an operating frequency band of 400 MHz to thereby broaden bandwidth.
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Specification