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US 7,002,527 B2Granted
Variable-directivity antenna and method for controlling antenna directivity
AssigneeRicoh Company, Ltd.
InventorSatoru Sugawara
Life of this patent
Estimating the term…
Abstract
A variable-directivity antenna comprises an omnidirectional antenna element, a transmission line connected to the antenna element, and an electric field adjusting structure provided in a boundary region between the antenna element and the transmission line. The electric field adjusting structure is configured to change electric field distribution of the transmission line to a desired direction.
Claims21
A variable-directivity antenna comprising:
- an omnidirectional antenna element;
- a transmission line connected to the antenna element;
- and
- an electric field adjusting structure provided in a boundary region between the antenna element and the transmission line and configured to change electric field distribution of the transmission line to a desired direction.
1 more element
A method for controlling directivity of an antenna, the method comprising the steps of:
- feeding a radio signal through a transmission line of the antenna;
- and
- varying electric field distribution of the transmission line in a boundary region between the transmission line and an antenna element connected to the transmission line, such that the electric field distribution turns to a desired direction.
Dependencies are inferred from the claim text.