Antenna device and wireless communication apparatus
First Claim
1. An antenna device comprising:
- a first antenna unit including a feed electrode, a first radiation electrode, and a first frequency-variable circuit connected between the first radiation electrode and the feed electrode; and
a second antenna unit including the feed electrode, a second radiation electrode, and a second frequency-variable circuit connected between the second radiation electrode and the feed electrode;
whereinthe first frequency-variable circuit includes a first reactance circuit connected to the feed electrode, the first reactance circuit consisting of a first coil connected in series with a first variable-capacitance diode whose capacitance is variable using a control voltage; and
a second reactance circuit connected between the first reactance circuit and the first radiation electrode, the second reactance circuit consisting of a second coil connected in series with a second variable-capacitance diode whose capacitance is variable using the control voltage;
the second frequency-variable circuit includes the first reactance circuit; and
a third reactance circuit connected between the first reactance circuit and the second radiation electrode, the third reactance circuit consisting of a third coil connected in series with a third variable-capacitance diode whose capacitance is variable using the control voltage; and
the first radiation electrode has a loop shape and includes an open end that faces the feed electrode with a gap therebetween, a reactance of the first antenna unit is provided by the gap between the open end of the first radiation electrode and the feed electrode;
whereincathodes of the first, second, and third variable-capacitance diodes are connected to each other, and the control voltage is configured to be applied where the cathodes are connected to each other.
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Abstract
An antenna device and a wireless communication apparatus that are capable of obtaining a plurality of resonant frequencies and varying the plurality of resonant frequencies over a wide range are provided. A first antenna unit of an antenna device includes a feed electrode, a first radiation electrode, and a first frequency-variable circuit. The first frequency-variable circuit includes first and second reactance circuits each including a variable-capacitance diode. A control voltage is applied to the first frequency-variable circuit, and the resonant frequency of the first antenna unit can thus be varied. A second antenna unit includes the feed electrode, a second radiation electrode, and a second frequency-variable circuit. The second frequency-variable circuit includes first and third reactance circuits each including a variable-capacitance diode. A control voltage is applied to the second frequency-variable circuit, and the resonant frequency of the second antenna unit can thus be varied.
12 Citations
6 Claims
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1. An antenna device comprising:
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a first antenna unit including a feed electrode, a first radiation electrode, and a first frequency-variable circuit connected between the first radiation electrode and the feed electrode; and a second antenna unit including the feed electrode, a second radiation electrode, and a second frequency-variable circuit connected between the second radiation electrode and the feed electrode;
whereinthe first frequency-variable circuit includes a first reactance circuit connected to the feed electrode, the first reactance circuit consisting of a first coil connected in series with a first variable-capacitance diode whose capacitance is variable using a control voltage; and
a second reactance circuit connected between the first reactance circuit and the first radiation electrode, the second reactance circuit consisting of a second coil connected in series with a second variable-capacitance diode whose capacitance is variable using the control voltage;the second frequency-variable circuit includes the first reactance circuit; and
a third reactance circuit connected between the first reactance circuit and the second radiation electrode, the third reactance circuit consisting of a third coil connected in series with a third variable-capacitance diode whose capacitance is variable using the control voltage; andthe first radiation electrode has a loop shape and includes an open end that faces the feed electrode with a gap therebetween, a reactance of the first antenna unit is provided by the gap between the open end of the first radiation electrode and the feed electrode;
whereincathodes of the first, second, and third variable-capacitance diodes are connected to each other, and the control voltage is configured to be applied where the cathodes are connected to each other. - View Dependent Claims (2, 3, 4)
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5. A wireless communication apparatus comprising:
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an antenna device comprising; a first antenna unit including a feed electrode, a first radiation electrode, and a first frequency-variable circuit connected between the first radiation electrode and the feed electrode; and a second antenna unit including the feed electrode, a second radiation electrode, and a second frequency-variable circuit connected between the second radiation electrode and the feed electrode;
whereinthe first frequency-variable circuit includes a first reactance circuit connected to the feed electrode, the first reactance circuit consisting of a first coil connected in series with a first variable-capacitance diode whose capacitance is variable using a control voltage; and
a second reactance circuit connected between the first reactance circuit and the first radiation electrode, the second reactance circuit consisting of a second coil connected in series with a second variable-capacitance diode whose capacitance is variable using the control voltage;
the second frequency-variable circuit includes the first reactance circuit; and
a third reactance circuit connected between the first reactance circuit and the second radiation electrode, the third reactance circuit consisting of a third coil connected in series with a third variable-capacitance diode whose capacitance is variable using the control voltage; andthe first radiation electrode has a loop shape and includes an open end that faces the feed electrode with a gap therebetween, a reactance of the first antenna unit is provided by the gap between the open end of the first radiation electrode and the feed electrode;
whereincathodes of the first, second, and third variable-capacitance diodes are connected to each other, and the control voltage is configured to be applied where the cathodes are connected to each other; and at least one of a transmitter or a receiver connected to the feed electrode. - View Dependent Claims (6)
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Specification