Antenna unit and planar wireless device
An object of the present invention is to provide a planar type antenna unit and a planar type wireless device capable of reducing a projecting area of the wireless device. To achieve the above object, the planar type wireless device of the present invention is provided with a grounded planar antenna 10 which includes a radiating element 11 and a ground plate 12 , a thin-film battery 20 which includes a positive-electrode current collector 21 opposing a negative-electrode current collector which is formed by the ground plate 12 , and a transmitter/receiver IC arranged at a power feeding point 13 of the grounded planar antenna 10 and including a transmitter-receiver circuit which receives power from the negative-electrode current collector of the thin-film battery 20 and the positive-electrode current collector 21 of the thin-film battery 20 , and transmits and receives signals by operating the radiating element 11 of the grounded planar antenna 10.
1. An antenna unit, comprising:
a grounded planar antenna including a radiating element and a ground plate; and
a thin-film battery including a positive-electrode current collector opposing a negative-electrode current collector which is formed by the ground plate,
wherein the ground plate and the positive-electrode current collector are overlapped, and
wherein the radiating element and the positive-electrode current collector are not overlapped.
2. The antenna unit according to claim 1 , wherein a mirror image of the radiating element is arranged within a plane of the ground plate.
3. A planar type wireless device, comprising:
the antenna unit according to claim 2 ; and
a circuit which receives power from the negative-electrode current collector of the thin-film battery and the positive-electrode current collector of the thin-film battery, and at least transmits or receives signals by operating the radiating element of the grounded planar antenna,
wherein the circuit is arranged at a power feeding point of the grounded planer antenna.
4. The antenna unit according to claim 1 , wherein a projecting area of the positive-electrode current collector is smaller than a projecting area of the negative-electrode current collector.
5. A planar type wireless device, comprising:
the antenna unit according to claim 4 ; and
a circuit which receives power from the negative-electrode current collector of the thin-film battery and the positive-electrode current collector of the thin-film battery, and at least transmits or receives signals by operating the radiating element of the grounded planar antenna,
wherein the circuit is arranged at a power feeding point of the grounded planer antenna.
6. The antenna unit according to claims 1 , wherein the positive-electrode current collector has a mesh structure.
7. A planar type wireless device, comprising:
the antenna unit according to claim 6 ; and
a circuit which receives power from the negative-electrode current collector of the thin-film battery and the positive-electrode current collector of the thin-film battery, and at least transmits or receives signals by operating the radiating element of the grounded planar antenna,
wherein the circuit is arranged at a power feeding point of the grounded planer antenna.
8. The antenna unit according to claim 1 , wherein the positive-electrode current collector is arranged at a position not overlapping with a mirror image of the radiating element.
9. A planar type wireless device, comprising:
the antenna unit according to claim 8 ; and
a circuit which receives power from the negative-electrode current collector of the thin-film battery and the positive-electrode current collector of the thin-film battery, and at least transmits or receives signals by operating the radiating element of the grounded planar antenna,
wherein the circuit is arranged at a power feeding point of the grounded planer antenna.
10. A planar type wireless device, comprising:
the antenna unit according to claim 1 ; and
a circuit which receives power from the negative-electrode current collector of the thin-film battery and the positive-electrode current collector of the thin-film battery, and at least transmits or receives signals by operating the radiating element of the grounded planar antenna,
wherein the circuit is arranged at a power feeding point of the grounded planer antenna.
11. A planar type wireless device, comprising:
an antenna unit, comprising:
a grounded planar antenna including a radiating element and a ground plate; and
a thin-film battery including a positive-electrode current collector opposing a
negative-electrode current collector which is formed by the ground plate; and
a circuit which receives power from the negative-electrode current collector of the thin-film battery and the positive-electrode current collector of the thin-film battery, and at least transmits or receives signals by operating the radiating element of the grounded planar antenna,
wherein the circuit is arranged at a power feeding point of the grounded planer antenna.
12. The planar type wireless device according to claim 11 , wherein a mirror image of the radiating element is arranged within a plane of the ground plate.
13. The planar type wireless device according to claim 11 , wherein a projecting area of the positive-electrode current collector is smaller than a projecting area of the negative-electrode current collector.
14. The planar type wireless device according to claims 11 , wherein the positive-electrode current collector has a mesh structure.
15. The planar type wireless device according to claim 11 , wherein the positive-electrode current collector is arranged at a position not overlapping with a mirror image of the radiating element.