ANTENNA UNIT AND MOBILE TERMINAL THEREWITH
First Claim
Patent Images
1. An antenna unit, comprising:
- a coil section formed on a magnetic sheet;
a transmission circuit in which an inductor, a first capacitor, and the coil section are connected in series; and
a reception circuit in which the coil section, the first capacitor, a resistance part, and a second capacitor are connected in series;
wherein the coil section is formed as one turn and the size of the coil and the resistance part involves the following relationship;
R=(S×
μ
e×
H×
Q×
2π
f)2/W where S;
Product of dimensions of length and width of the coil section, R;
Resistance value of the resistance part, W;
Drive power at the IC chip receiving time, H;
Magnetic field strength in the coil section, Q;
Antenna performance, μ
e;
Effective magnetic permeability of the magnetic sheet, and f;
Frequency at the transmitting-receiving time.
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Accused Products
Abstract
An antenna unit includes an antenna formed on a magnetic sheet. A transmission circuit includes an inductor, a matching capacitor, and the antenna connected in series, and a reception circuit includes the antenna, the matching capacitor, a resistor, and a capacitor connected in series. The antenna is formed as one turn, and the size of the antenna and the resistor involves a predetermined relationship.
49 Citations
11 Claims
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1. An antenna unit, comprising:
-
a coil section formed on a magnetic sheet; a transmission circuit in which an inductor, a first capacitor, and the coil section are connected in series; and a reception circuit in which the coil section, the first capacitor, a resistance part, and a second capacitor are connected in series; wherein the coil section is formed as one turn and the size of the coil and the resistance part involves the following relationship;
R=(S×
μ
e×
H×
Q×
2π
f)2/Wwhere S;
Product of dimensions of length and width of the coil section, R;
Resistance value of the resistance part, W;
Drive power at the IC chip receiving time, H;
Magnetic field strength in the coil section, Q;
Antenna performance, μ
e;
Effective magnetic permeability of the magnetic sheet, and f;
Frequency at the transmitting-receiving time. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An antenna unit, comprising:
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a first coil composed of one turn formed on a magnetic sheet; a second coil composed of one turn formed on the same plane as the first coil on the magnetic sheet; a first connection terminal connected to one end part of the first coil; a second connection terminal connected to one end part of the second coil; a third connection terminal connected to an opposite end part of the second coil and selectively connected to an opposite end part of the first coil; and a fourth connection terminal selectively connected to the opposite end part of the first coil. - View Dependent Claims (9, 10)
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11. An antenna unit, comprising:
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a coil section formed on a magnetic sheet; a transmission circuit in which an inductor, a first capacitor, and the coil section are connected in series; and a reception circuit in which the coil section, the first capacitor, a resistance part, and a second capacitor are connected in series; wherein the magnetic sheet is composed of at least a plurality of fixed piece magnetic substances and the resistance part involves the following relationship;
R=(S×
μ
e×
H×
Q×
2π
f)2/Wwhere S;
Product of dimensions of length and width of the coil section, R;
Resistance value of the resistance part, W;
Drive power at the IC chip receiving time, H;
Magnetic field strength in the coil section, Q;
Antenna performance, μ
e;
Effective magnetic permeability of the magnetic sheet, andf;
Frequency at the transmitting-receiving time.
-
Specification