Antenna device and wireless communication apparatus
AssigneeKabushiki Kaisha Toshiba
InventorsMakoto HIGAKI, Shuichi Obayashi
Life of this patent
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Abstract
An antenna device of an embodiment includes: an antenna; a variable impedance matching circuit that is connected to the antenna; a probe that receives power from the antenna; a power detector that is connected to the probe; a control circuit controlling the variable impedance matching circuit based on a value of power measured by the power detector; a first arithmetic circuit calculating a variation in the value of power measured by the power detector; a comparator circuit that compares the variation with a predetermined numerical value range; and a starter circuit that activates the control circuit based on a result of the comparison performed by the comparator circuit.
Claims20
An antenna device comprising:
- an antenna;
- a variable impedance matching circuit connected to the antenna;
- a probe receiving power from the antenna;
- a power detector connected to the probe;
- a control circuit controlling the variable impedance matching circuit based on a power value measured by the power detector;
- a first arithmetic circuit calculating a variation in the power value measured by the power detector;
- a comparator circuit comparing the variation with a predetermined numerical value range;
- and
- a starter circuit activating the control circuit based on a result of the comparison performed by the comparator circuit.
A wireless communication apparatus comprising:
- an antenna device including:
- an antenna;
- a variable impedance matching circuit connected to the antenna;
- a probe receiving power from the antenna;
- a power detector connected to the probe;
- a control circuit controlling the variable impedance matching circuit based on a power value measured by the power detector;
- a first arithmetic circuit calculating a variation in the power value measured by the power detector;
- a comparator circuit comparing the variation with a predetermined numerical value range;
- and a starter circuit activating the control circuit based on a result of the comparison performed by the comparator circuit;
- a radio connected to the opposite side of the variable impedance matching circuit from the antenna;
- and
- a power amplifier connected between the variable impedance matching circuit and the radio.
An antenna device comprising:
- an antenna;
- a variable impedance matching circuit connected to the antenna;
- a probe receiving power from the antenna;
- a first power detector connected to the probe;
- a control circuit controlling the variable impedance matching circuit based on a power value measured by the first power detector;
- a second power detector connected to the opposite side of the variable impedance matching circuit from the antenna;
- a comparator circuit comparing a first power value measured by the first power detector with a second power value measured by the second power detector;
- and
- a starter circuit activating the control circuit based on a result of the comparison performed by the comparator circuit.
A wireless communication apparatus comprising:
- an antenna device including:
- an antenna;
- a variable impedance matching circuit connected to the antenna;
- a probe receiving power from the antenna;
- a first power detector connected to the probe;
- a control circuit controlling the variable impedance matching circuit based on a power value measured by the first power detector;
- a second power detector connected to the opposite side of the variable impedance matching circuit from the antenna;
- a comparator circuit comparing a first power value measured by the first power detector with a second power value measured by the second power detector;
- and a starter circuit activating the control circuit based on a result of the comparison performed by the comparator circuit;
- a radio connected to the opposite side of the variable impedance matching circuit from the antenna;
- and
- a power amplifier connected between the variable impedance matching circuit and the radio.
Dependencies are inferred from the claim text.