Antenna Control Device, Reception Device, And Antenna Control Method
First Claim
1. An antenna control device for a communication device that includes:
- an antenna portion that has an antenna which performs radio communication of a signal; and
a signal conversion portion that is connected to the antenna portion via a signal line and converts a signal;
the antenna control device comprising;
a direct-current power supply that is disposed in the signal conversion portion and supplies a direct-current voltage;
a switch portion that is disposed in the signal conversion portion and switches connection between the direct-current power supply and the signal line, thereby applying a direct-current voltage that has either voltage value of a first positive voltage value and a second negative voltage value to the signal line; and
an antenna switch portion that is disposed in the antenna portion and switches a characteristic of the antenna;
wherein based on a voltage value of the direct-current voltage applied to the signal line, the antenna switch portion switches the characteristic of the antenna.
1 Assignment
0 Petitions
Accused Products
Abstract
A reception device includes: a variable-directivity antenna; an antenna amplifier which amplifies a signal inputted from the variable-directivity antenna; a regulator which supplies DC power to the antenna amplifier; a full wave rectification unit which supplies the DC power to the regulator; a signal line; a DC power source; and a switching unit which switches connection with the DC power source. DC voltage is applied to the DC power source by the signal line so as to control the directivity of the variable-directivity antenna. Moreover, the DC power is supplied to the regulator via the full wave rectification unit. When the connection of the switching unit is switched, the DC voltage supplied to the variable-directivity antenna is reversed between positive and negative voltage but the DC voltage supplied to the regulator is not reversed.
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Citations
17 Claims
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1. An antenna control device for a communication device that includes:
- an antenna portion that has an antenna which performs radio communication of a signal; and
a signal conversion portion that is connected to the antenna portion via a signal line and converts a signal;the antenna control device comprising; a direct-current power supply that is disposed in the signal conversion portion and supplies a direct-current voltage; a switch portion that is disposed in the signal conversion portion and switches connection between the direct-current power supply and the signal line, thereby applying a direct-current voltage that has either voltage value of a first positive voltage value and a second negative voltage value to the signal line; and an antenna switch portion that is disposed in the antenna portion and switches a characteristic of the antenna; wherein based on a voltage value of the direct-current voltage applied to the signal line, the antenna switch portion switches the characteristic of the antenna.
- an antenna portion that has an antenna which performs radio communication of a signal; and
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2. A reception device including:
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an antenna portion that has an antenna which receives a signal; and
a demodulation portion that is connected to the antenna portion via a signal line and demodulates an input signal;the reception device comprising; a direct-current power supply that is disposed in the demodulation portion and supplies a direct-current voltage; a switch portion that is disposed in the demodulation portion and switches connection between the direct-current power supply and the signal line, thereby applying a direct-current voltage that has either voltage value of a first positive voltage value and a second negative voltage value to the signal line; and an antenna switch portion that is disposed in the antenna portion and switches a characteristic of the antenna; wherein based on a voltage value of the direct-current voltage applied to the signal line, the antenna switch portion switches the characteristic of the antenna. - View Dependent Claims (3, 4, 5, 6, 7, 8, 10, 11, 12, 13, 14, 15, 16, 17)
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9. An antenna control method for a communication device that includes an antenna portion that has an antenna which performs radio communication of a signal;
- and a signal conversion portion that is connected to the antenna portion via a signal line and converts a signal;
the antenna control method comprising the steps for; applying a direct-current voltage that has either voltage value of a first positive voltage value and a second negative voltage value to the signal line; and controlling a characteristic of the antenna based on a voltage value of the direct-current voltage applied to the signal line.
- and a signal conversion portion that is connected to the antenna portion via a signal line and converts a signal;
Specification