Antenna and wireless communication device
First Claim
1. An antenna comprising:
- a first antenna section in which a radiating electrode having an open distal end is connected to a feeding electrode via a frequency-changing circuit; and
a second antenna section including an additional radiating electrode and the feeding electrode, the additional radiating electrode having an open distal end and being connected to a middle portion of the frequency-changing circuit;
whereinthe frequency-changing circuit includes a first reactance circuit and a second reactance circuit connected to each other, the first reactance circuit being connected to the feeding electrode and having a reactance that is variable according to a direct-current control voltage, and the second reactance circuit being connected to the radiating electrode of the first antenna section; and
the additional radiating electrode of the second antenna section branches from a node defined between the first and second reactance circuits.
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Accused Products
Abstract
An antenna and a wireless communication device are adapted to have a plurality of resonant frequencies changed simultaneously by a desired range at a low voltage. The antenna includes a first antenna section and a second antenna section. The first antenna section includes a feeding electrode, a frequency-changing circuit, and a radiating electrode, and the second antenna section includes the feeding electrode, a first reactance circuit, and an additional radiating electrode. The frequency-changing circuit has a circuit configuration in which the first reactance circuit and the second reactance circuit are connected. When a control voltage Vc is applied to a node P, the reactances of the first and second reactance circuits change in accordance with the magnitude of the control voltage Vc, so that a resonant frequency f1 of the first antenna section and a resonant frequency f2 of the second antenna section change simultaneously.
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Citations
17 Claims
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1. An antenna comprising:
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a first antenna section in which a radiating electrode having an open distal end is connected to a feeding electrode via a frequency-changing circuit; and a second antenna section including an additional radiating electrode and the feeding electrode, the additional radiating electrode having an open distal end and being connected to a middle portion of the frequency-changing circuit;
whereinthe frequency-changing circuit includes a first reactance circuit and a second reactance circuit connected to each other, the first reactance circuit being connected to the feeding electrode and having a reactance that is variable according to a direct-current control voltage, and the second reactance circuit being connected to the radiating electrode of the first antenna section; and the additional radiating electrode of the second antenna section branches from a node defined between the first and second reactance circuits. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification