Antenna apparatus and communication method employing it
First Claim
Patent Images
1. An antenna apparatus comprising:
- a monopole antenna forming an antenna element having a metal shell body,a reflecting plate disposed between a power supply part and the antenna element and not connected to the antenna element such that the reflecting plate covers and shields the power supply part side of the antenna element, wherein;
said antenna element has an approximately conical part, a vertex of which is on the side of a power supply part;
said antenna apparatus is disposed in a vehicle cabin for receiving radio waves from a transmitter mounted in a wheel;
said transmitter comprises respective transmitters mounted in respective wheels; and
said antenna apparatus is disposed at a position of a vehicle body roof part approximately equidistant from the respective wheels in such a manner that a head part of the antenna element faces vertically downward.
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Accused Products
Abstract
An antenna apparatus includes a monopole antenna forming an antenna element having a metal shell body, and the antenna element has an approximately conical part, a vertex of which is on the side of a power supply part.
10 Citations
8 Claims
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1. An antenna apparatus comprising:
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a monopole antenna forming an antenna element having a metal shell body, a reflecting plate disposed between a power supply part and the antenna element and not connected to the antenna element such that the reflecting plate covers and shields the power supply part side of the antenna element, wherein; said antenna element has an approximately conical part, a vertex of which is on the side of a power supply part; said antenna apparatus is disposed in a vehicle cabin for receiving radio waves from a transmitter mounted in a wheel; said transmitter comprises respective transmitters mounted in respective wheels; and said antenna apparatus is disposed at a position of a vehicle body roof part approximately equidistant from the respective wheels in such a manner that a head part of the antenna element faces vertically downward. - View Dependent Claims (2, 3, 4)
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5. An antenna apparatus comprising;
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a monopole antenna forming an antenna element having a metal shell body, and a capacitative member at a head part of the antenna element located on a side opposite to said power supply part side, wherein; said antenna element has an approximately conical part, a vertex of which is on the side of a power supply part, and said capacitative member is a flat plate; and said antenna apparatus is disposed in a vehicle cabin for receiving radio waves from a transmitter mounted in a wheel.
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6. An antenna apparatus comprising;
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a monopole antenna forming an antenna element having a metal shell body, and a reflecting plate disposed between a power supply part and the antenna element and not connected to the antenna element such that the reflecting plate covers and shields the power supply part side of the antenna element;
wherein;said antenna element has a rotationally symmetrical shape, and has a part having a radius different along an axis of said rotationally symmetrical shape; said antenna apparatus is disposed in a vehicle cabin for receiving radio waves from a transmitter mounted in a wheel; said transmitter comprises respective transmitters mounted in respective wheels; and said antenna apparatus is disposed at a position of a vehicle body roof part approximately equidistant from the respective wheels in such a manner that a head part of the antenna element faces vertically downward. - View Dependent Claims (7, 8)
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Specification