Antenna device and radio communication apparatus
First Claim
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1. An antenna device, comprising:
- an antenna main body having at least three electricity feeding points; and
a feeder circuit for feeding an electrical signal to the antenna main body,wherein the feeder circuit includes a strip line for connecting each feeding point, the strip line having a first path and a second path, wherein the second path has a phase delay; and
a switch which switches between the first path and the second path of said strip line, and wherein the feeder circuit feeds electrical signals different in at least one of amplitude and phase to the electricity feeding points, andwherein the antenna main body includes an antenna layer, a dielectric layer, a ground layer, a cylindrical conductor for electrically connecting a center part of the antenna layer to a center part of the ground layer, and conductors connected to the antenna layer at the electricity feeding points.
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Abstract
An antenna device includes an antenna main body having at least three electricity feeding points and a feeder circuit for feeding an electrical signal to the antenna main body. The feeder circuit feeds electrical signals different in at least one of amplitude and phase to the electricity feeding points. The device enables to control the directivity with the use of a single antenna.
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Citations
9 Claims
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1. An antenna device, comprising:
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an antenna main body having at least three electricity feeding points; and a feeder circuit for feeding an electrical signal to the antenna main body, wherein the feeder circuit includes a strip line for connecting each feeding point, the strip line having a first path and a second path, wherein the second path has a phase delay; and a switch which switches between the first path and the second path of said strip line, and wherein the feeder circuit feeds electrical signals different in at least one of amplitude and phase to the electricity feeding points, and wherein the antenna main body includes an antenna layer, a dielectric layer, a ground layer, a cylindrical conductor for electrically connecting a center part of the antenna layer to a center part of the ground layer, and conductors connected to the antenna layer at the electricity feeding points. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification