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US 8,797,227 B2Granted
Slot halo antenna with tuning stubs
AssigneeSkywave Antennas, Inc.
InventorRoger Owens
Life of this patent
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Abstract
An antenna of the present disclosure has a housing having a shallow cavity in the housing and a flat, disk-shaped radiating element disposed in the shallow cavity, the radiating element having an arc shape slot. In addition, the antenna has a substantially circular parasitic element disposed in the shallow cavity on the bottom of the housing. The antenna operates as a half-wave antenna at a frequency range of 450 MHz to 470 MHz and as a full-wave antenna at a frequency range of 902 MHz to 928 MHz.
Claims22
An antenna, comprising:
- a housing having a shallow cavity;
- a substantially disk-shaped and substantially flat radiating element disposed in the shallow cavity, the radiating element having an arc-shape slot, the arc-shaped slot comprising a first straight end, a second straight end, an outer arc-shaped edge, and an inner arc-shaped edge the slot having a length substantially greater than a width of the slot, the radiating element further comprising a first tuning stub associated with a the first end of the a slot and a second tuning stub associated with the second end of the slot, the first and second tuning stubs each comprising extensions from the radiating element circumferentially aligned with an outer perimeter of the radiating element and in the same plane as the radiating element, the extensions forming partial slots near the first and second ends of the slot;
- a substantially circular parasitic element parallel to and spaced apart from the radiating element, the parasitic element being substantially disk-shaped and substantially flat.
An antenna, comprising:
- a substantially flat, disc-shaped radiating element having an arc-shaped slot formed therein, the radiating element comprising a first tuning stub associated with a first end of the slot and a second tuning stub associated with a second end of the slot, the radiating element, the slot, the first tuning stub, and the second tuning stub all lying in substantially the same plane;
- a substantially flat, disk-shaped parasitic element substantially parallel to the radiating element and separated from the radiating element by a dielectric material;
- and
- a cable electrically connected to the radiating element.
1 more element
Dependencies are inferred from the claim text.