Wirelessly-communicable memory card
A memory card includes a substrate, a nonvolatile memory on the substrate, a memory controller on the substrate and configured to control access to the nonvolatile memory, an interface terminal for external wired connection, on the substrate, an antenna, a plain region surrounded by the antenna including a first region that overlaps with the substrate and a second region that does not overlap with the substrate, and a communication controller disposed on the substrate, electrically connected to the antenna, and configured to wirelessly communicate with an external device through the antenna, using power generated at the antenna by an electromagnetic induction caused by the external device.
1. A memory card, comprising:
a substrate;
a nonvolatile memory on the substrate;
a memory controller on the substrate and configured to control access to the nonvolatile memory;
an interface terminal for external wired connection, on the substrate;
an antenna, a region surrounded by the antenna including a first region that overlaps with the substrate and a second region that does not overlap with the substrate; and
a communication controller on the substrate, electrically connected to the antenna, and configured to wirelessly communicate with an external device through the antenna, using power generated at the antenna by an electromagnetic induction caused by the external device.
2. The memory card according to claim 1 , further comprising:
a second substrate on which the antenna is formed.
3. The memory card according to claim 2 , wherein
the substrate includes a first pad that is electrically connected to the communication controller and a second pad that is electrically separated from the nonvolatile memory, the memory controller, the interface terminal, and the communication controller, and
the second substrate includes a third pad that is soldered with the first pad and a fourth pad that is soldered with the second pad, the communication controller and the antenna being electrically connected through an electrical connection of the first pad and the third pad.
4. The memory card according to claim 3 , wherein
one of the third and fourth pads is located on the second substrate within the region, and the other of the third and fourth pads is located outside the region.
5. The memory card according to claim 2 , wherein
a thickness of the second substrate is less than a thickness of the substrate.
6. The memory card according to claim 1 , wherein
at least one of the nonvolatile memory, the memory controller, and the communication controller is located outside the region.
7. The memory card according to claim 1 , wherein
the substrate includes an antenna portion that is electrically connected to the antenna and serves as a single antenna together with the antenna.
8. The memory card according to claim 7 , wherein
the antenna portion is disposed along a periphery of the substrate.
9. The memory card according to claim 7 , wherein
the antenna portion includes a first sub-portion formed on a first surface of the substrate and a second sub-portion formed on a second surface of the substrate opposite to the first surface.
10. The memory card according to claim 9 , wherein
the interface terminal is formed on the second surface of the substrate, and the first sub-portion of the antenna portion overlaps with the interface terminal.
11. The memory card according to claim 1 , wherein
the substrate includes a ground terminal in a region on which the nonvolatile memory or the memory controller is disposed.
12. The memory card according to claim 1 , further comprising:
a sealing resin layer formed on the substrate and covering the nonvolatile memory, the memory controller, and the communication controller.
13. The memory card according to claim 1 , further comprising:
a housing including a first member and a second member, the substrate and the antenna being disposed in a space formed by the first and second members.
14. The memory card according to claim 13 , wherein
the first member includes a first recessed portion in which the antenna is disposed, and
the second member includes a second recessed portion in which at least part of the substrate is disposed.
15. The memory card according to claim 13 , wherein
the antenna is embedded in one of the first and second members.
16. The memory card according to claim 13 , further comprising:
a label fixed to one of the first and second members, the antenna being embedded in the label.
17. A memory card, comprising:
a substrate;
a nonvolatile memory on the substrate;
a memory controller on the substrate and configured to control access to the nonvolatile memory;
an interface terminal for external wired connection on the substrate;
an antenna; and
a communication controller disposed on the substrate, electrically connected to the antenna, and configured to wirelessly communicate with an external device through the antenna, using power generated at the antenna by an electromagnetic induction caused by the external device, wherein
a region surrounded by the antenna, that includes a first region that overlaps with at least one of the nonvolatile memory and the communication controller, and a second region that does not overlap with the substrate.
18. The memory card according to claim 17 , further comprising:
a second substrate on which the antenna is formed.
19. The memory card according to claim 18 , wherein
a thickness of the second substrate is less than a thickness of the substrate.
20. The memory card according to claim 17 , wherein
at least one of the nonvolatile memory, the memory controller, and the communication controller is located outside the region.