Antenna device
First Claim
Patent Images
1. An antenna device comprising:
- an antenna element;
a variable capacitor disposed closely to said antenna element and coupled with said antenna element;
a tuning voltage supply terminal for supplying a tuning voltage to said variable capacitor;
a resonance circuit including said antenna element and said variable capacitor; and
a signal power terminal capable of at least one of sending a signal power to said resonance circuit and receiving a signal power from said resonance circuit.
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Abstract
An antenna device having a high gain is presented. The device includes an antenna element, a variable capacitor disposed closely to the antenna element and connected to the antenna element in series or parallel to form a resonance circuit, a tuning voltage supply terminal for supplying a tuning voltage for varying a capacitance of the variable capacitor, and an signal power terminal capable of at least one of sending a signal power to the resonance circuit and receiving a signal power from the resonance circuit.
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Citations
32 Claims
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1. An antenna device comprising:
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an antenna element;
a variable capacitor disposed closely to said antenna element and coupled with said antenna element;
a tuning voltage supply terminal for supplying a tuning voltage to said variable capacitor;
a resonance circuit including said antenna element and said variable capacitor; and
a signal power terminal capable of at least one of sending a signal power to said resonance circuit and receiving a signal power from said resonance circuit. - View Dependent Claims (2, 3, 4, 5, 6, 25, 27, 28)
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7. An antenna device comprising:
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an antenna element;
a plurality of variable capacitors disposed closely to said antenna element, being coupled with said antenna element;
a plurality of resonance circuits including said antenna element and said variable capacitors, respectively; and
a signal power terminal capable of at least one of sending a signal power to said resonance circuits and receiving a signal power from said resonance circuits. - View Dependent Claims (8, 9, 10, 11, 12, 14, 15, 16, 18, 19, 20, 21, 22, 23, 24, 26, 30)
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13. An antenna device comprising:
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a plurality of antenna elements having antenna lengths different from each other;
a plurality of resonance circuits including said antenna elements, respectively;
a first switch capable of at least one of sending a signal power to said resonance circuits and receiving a signal power from said resonance circuits; and
a signal power terminal coupled with said first switch.
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17. An antenna device comprising:
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an antenna element;
a variable capacitor disposed closely to said antenna element, being coupled with said antenna element;
a tuning voltage supply terminal for supplying a tuning voltage to said variable capacitor;
a resonance circuit including said antenna element and said variable capacitor; and
a signal power terminal for receiving a signal power from said resonance circuit.
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29. An antenna device comprising:
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an antenna element;
a plurality of variable capacitors disposed closely to said antenna element, said variable capacitors being coupled with said antenna element, said variable capacitors receiving tuning voltages independently; and
a plurality of resonance circuits including said antenna element and said variable capacitors, respectively, wherein outputs of said resonance circuits are coupled with a tuner circuit, wherein a feedback signal is generated from an output of said tuner circuit, and wherein a capacitance of each of said variable capacitors is varied on the basis of the feedback signal.
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31. An antenna device comprising:
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a plurality of antenna elements having antenna lengths different from each other;
a plurality of variable capacitors coupled with said antenna elements, respectively;
a plurality of resonance circuits including said antenna elements and said variable capacitors, respectively; and
a switch for selecting signal powers from said resonance circuits, wherein an output of said switch is coupled with a tuner circuit, wherein a feedback signal is generated from an output of said tuner circuit, and wherein a capacitance of each of said variable capacity capacitors is varied on the basis of the feedback signal.
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32. An antenna device comprising:
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an antenna element having a inductance being variable;
a capacitor disposed closely to said antenna element, being coupled with said antenna element;
a resonance circuit including said antenna element and said capacitor;
a tuning voltage supply terminal for supplying a tuning voltage for varying the inductance of said antenna element; and
a signal power terminal capable of at least one of sending a signal power to said resonance circuit and receiving a signal power from said resonance circuit.
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Specification