Antenna and antenna module
First Claim
1. An antenna comprising:
- a first coil electrode having a planar coil shape and including a first end portion and a second end portion;
a second coil electrode that is spaced apart from the first coil electrode by a predetermined distance, has a planar coil shape and includes a third end portion and a fourth end portion;
a first connection electrode and a second connection electrode arranged to allow the second end portion of the first coil electrode and the fourth end portion of the second coil electrode to be connected to an external device; and
a central electrode that is arranged between the fourth end portion and the second connection electrode;
whereinthe first coil electrode, the second coil electrode, the first connection electrode, the second connection electrode and the central electrode are arranged such that the first end portion and the third end portion are capacitively coupled, the second end portion and the first connection electrode are capacitively coupled, the fourth end portion and the central electrode are capacitively coupled, and the central electrode and the second connection electrode are capacitively coupled; and
a coupling capacitance between the first end portion and the third end portion is larger than a coupling capacitance between the second end portion and the first connection electrode and a coupling capacitance between the fourth end portion and the central electrode is larger than a coupling capacitance between the central electrode and the second connection electrode.
1 Assignment
0 Petitions
Accused Products
Abstract
An antenna includes a flexible sheet, a first coil electrode being formed on a first main surface of the flexible sheet and a second coil electrode being formed on a second main surface of the flexible sheet. Another end portion of the first coil electrode and another end portion 32B of the second coil electrode oppose each other with the flexible sheet there between. One end portion of the first coil electrode opposes an electrode pad, which has a smaller area than the one end portion, with a mounting substrate there between. One end portion of the second coil electrode and a central electrode oppose each other with the flexible sheet there between, and the central electrode opposes an electrode pad, which has a smaller area than the central electrode, with the mounting substrate there between.
9 Citations
10 Claims
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1. An antenna comprising:
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a first coil electrode having a planar coil shape and including a first end portion and a second end portion; a second coil electrode that is spaced apart from the first coil electrode by a predetermined distance, has a planar coil shape and includes a third end portion and a fourth end portion; a first connection electrode and a second connection electrode arranged to allow the second end portion of the first coil electrode and the fourth end portion of the second coil electrode to be connected to an external device; and a central electrode that is arranged between the fourth end portion and the second connection electrode;
whereinthe first coil electrode, the second coil electrode, the first connection electrode, the second connection electrode and the central electrode are arranged such that the first end portion and the third end portion are capacitively coupled, the second end portion and the first connection electrode are capacitively coupled, the fourth end portion and the central electrode are capacitively coupled, and the central electrode and the second connection electrode are capacitively coupled; and a coupling capacitance between the first end portion and the third end portion is larger than a coupling capacitance between the second end portion and the first connection electrode and a coupling capacitance between the fourth end portion and the central electrode is larger than a coupling capacitance between the central electrode and the second connection electrode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An antenna module comprising:
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a wireless communication IC device; a first coil electrode having a planar coil shape and including a first end portion and a second end portion; a second coil electrode that is spaced apart from the first coil electrode by a predetermined distance, has a planar coil shape and includes a third end portion and a fourth end portion; a first connection electrode and a second connection electrode arranged to allow the second end portion of the first coil electrode and the fourth end portion of the second coil electrode to be connected to the wireless communication IC device; and a central electrode that is arranged between the fourth end portion and the second connection electrode;
whereinthe first coil electrode, the second coil electrode, the first connection electrode, the second connection electrode and the central electrode are arranged such that the first end portion and the third end portion are capacitively coupled, the second end portion and the first connection electrode are capacitively coupled, the fourth end portion and the central electrode are capacitively coupled, and the central electrode and the second connection electrode are capacitively coupled; and a coupling capacitance between the first end portion and the third end portion is larger than a coupling capacitance between the second end portion and the first connection electrode, and wherein a coupling capacitance between the fourth end portion and the central electrode is larger than a coupling capacitance between the central electrode and the second connection electrode.
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10. An antenna module comprising:
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a wireless communication IC device that includes a first mounting land electrode and a second mounting land electrode; a first coil electrode having a planar coil shape and including a first end portion and a second end portion; a second coil electrode that is spaced apart from the first coil electrode by a predetermined distance, has a planar coil shape and includes a third end portion and a fourth end portion; and a central electrode that is arranged between the fourth end portion and the second mounting land electrode;
whereinthe first coil electrode, the second coil electrode and the central electrode and the wireless communication IC device is arranged with respect to the first coil electrode and the second coil electrode such that the first end portion and the third end portion are capacitively coupled, the second end portion and the first mounting land electrode are capacitively coupled, the fourth end portion and the central electrode are capacitively coupled and the central electrode and the second mounting land electrode are capacitively coupled; a coupling capacitance between the first end portion and the third end portion is larger than a coupling capacitance between the second end portion and the first mounting land electrode; and a coupling capacitance between the fourth end portion and the central electrode is larger than a coupling capacitance between the central electrode and the second mounting land electrode.
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Specification