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US 7,403,158 B2Granted
Compact circular polarized antenna
AssigneeApplied Wireless Identification Group, Inc.
InventorVadim Kikin
Life of this patent
Estimating the term…
Abstract
A circular polarized antenna having an electrically conductive element having a generally annular outer portion and first and second inner members coupled to the outer portion. A ground shield is spaced from the element, the ground shield providing an effective ground plane. A dielectric material is positioned between the element and at least a portion of the ground shield.
Claims30
A circular polarized antenna, comprising:
- an electrically conductive element having:
- a generally annular outer portion, the outer portion having an outer periphery and an inner periphery;
- and
- first and second elongate inner members coupled to the outer portion;
- a ground shield spaced from the element, the ground shield providing an effective ground plane, the effective ground plane having a maximum width in a direction parallel to a plane of the element of less than about one-half of an operating wavelength;
- and
- a dielectric material positioned between the element and at least a portion of the ground shield.
4 more elements
A circular polarized antenna, comprising:
- a substantially square-shaped electrically conductive element having a plurality of voids defined therein, edges of the element along the voids defining an outer portion of the element and at least two elongate inner members of the element;
- a ground shield spaced from the element and having a substantially square-shaped outer periphery, the ground shield providing an effective ground plane, the effective ground plane having widths in a direction parallel to a plane of the element and perpendicular to each other and perpendicular to straight sections of the outer periphery of less than about one-third of an operating wavelength;
- and
- a dielectric material positioned between the element and at least a portion of the ground shield.
1 more element
A circular polarized antenna, comprising:
- a substantially square-shaped electrically conductive element having a plurality of voids defined therein, edges of the element along the voids defining an outer portion of the element and at least two elongate inner members of the element;
- a ground shield spaced from the element and having a substantially square-shaped outer periphery, the ground shield providing an effective ground plane, the effective ground plane having widths in a direction parallel to a plane of the element and perpendicular to each other and perpendicular to straight sections of the outer periphery of less than about one-third of an operating wavelength, wherein a portion of the ground shield lies on a same plane as the element;
- and
- a dielectric material positioned between the element and at least a portion of the ground shield.
1 more element
A circular polarized antenna, comprising:
- an electrically conductive element having a generally annular outer portion and inner members extending from an inner periphery of the outer portion and lying in about the same plane as the outer portion;
- a ground shield spaced from the element, the ground shield providing an effective ground plane, the effective ground plane having a maximum width in a direction parallel to a plane of the element of less than about one-half of an operating wavelength;
- and
- a dielectric material positioned between the element and at least a portion of the ground shield, the dielectric material having a dielectric constant less than about 2 at 0° C.
1 more element
Dependencies are inferred from the claim text.