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US 6,606,069 B2Granted
Antenna device
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsHirokazu Kitamura, Masashi Yasuda, Masao Onishi, Yoshihiro Nakashima
Life of this patent
Estimating the term…
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.
Claims32
An antenna device comprising:
- an antenna element;
- a variable capacitor disposed closely to said antenna element and coupled with said antenna element, said variable capacitor having a capacitance determined by a tuning signal;
- a tuning signal supply terminal for supplying said tuning signal 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.
3 more elements
An antenna device comprising:
- 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.
2 more elements
An antenna device comprising:
- a plurality of antenna elements having antenna lengths different from each other;
- a plurality of resonance circuits, each resonance circuit including one of said antenna elements and a variable capacitor having a capacitance determined by a tuning signal;
- 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.
2 more elements
An antenna device comprising:
- an antenna element;
- a variable capacitor disposed closely to said antenna element, being coupled with said antenna element, said variable capacitor having a capacitance determined by a tuning signal;
- a tuning signal supply terminal for supplying said tuning signal 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.
3 more elements
An antenna device comprising:
- 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 signals determining capacitances of said variable capacitors 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.
4 more elements
An antenna device comprising:
- 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.
5 more elements
An antenna device comprising:
- an antenna element having an 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 signal supply terminal for supplying a tuning signal 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.
3 more elements
Dependencies are inferred from the claim text.