Wireless device
According to an embodiment, a wireless device includes an interposer, a semiconductor chip, electrodes, and a slot antenna. The interposer includes conductive layers disposed at least at a side of a component mounting surface and a side of a reverse surface opposite to the component mounting surface. The semiconductor chip is mounted on the component mounting surface and includes a built-in transceiving circuit. The electrodes are disposed in a conductive layer disposed at the side of the reverse surface of the interposer so as to be electrically connected to an outside of the wireless device. At least a portion of the slot antenna is disposed in at least one of the conductive layers of the interposer. A shortest distance between an end in a width direction of the slot antenna and the electrodes is smaller than a sum of a minimum line width and a minimum line space of the interposer.
1. A wireless device comprising:
an interposer that includes conductive layers disposed at least at a side of a component mounting surface and a side of a reverse surface which is opposite to the component mounting surface;
a semiconductor chip that is mounted on the component mounting surface of the interposer and that includes a built-in transceiving circuit;
a plurality of electrodes that are disposed in a conductive layer disposed at the side of the reverse surface of the interposer so as to be electrically connected to an outside of the wireless device; and
a slot antenna, at least a portion of the slot antenna disposed in at least one of the conductive layers of the interposer, wherein
a shortest distance between an end in a width direction of the slot antenna and the plurality of electrodes is smaller than a sum of a minimum line width and a minimum line space of the interposer.
2. The device according to claim 1 , further comprising:
a non-conductor that is placed on the component mounting surface of the interposer and that seals the semiconductor chip; and
a conductive film that covers a surface of the non-conductor and a side surface of the interposer, and that is electrically connected to at least one of the conductive layers of the interposer, wherein
the slot antenna is disposed across a principal surface portion of the conductive film which faces the component mounting surface of the interposer, a side surface portion of the conductive film which faces the side surface of the interposer, and one of the conductive layers of the interposer.
3. The device according to claim 2 , wherein the portion of the slot antenna disposed in at least one of the conductive layers of the interposer is formed of a insulating portion between a conductor pattern, which is formed in the at least one of the conductive layers and is separated from the side surface of the interposer, and the side surface portion of the conductive film.
4. The device according to claim 2 , wherein the portion of the slot antenna disposed in at least one of the conductive layers of the interposer is formed of a non-conductive portion between a first conductor pattern, which is disposed in the at least one of the conductive layers and is separated from the side surface of the interposer, and a comb-shaped second conductor pattern, which is disposed in the at least one of the conductive layers and is adjacent to the side surface of the interposer and which is electrically connected to the side surface portion of the conductive film.
5. The device according to claim 1 , wherein
the plurality of electrodes includes an electrode used for communicating a signal with the outside of the wireless device and an electrode having a ground potential, and
at least the portion of the slot antenna disposed in at least one of the conductive layers of the interposer is disposed from neighborhood of the electrode having the ground potential to neighborhood of the electrodes used for communicating the signal, and a width of the slot antenna at a position closest to the electrode having the ground potential is greater than a width at a position closest to the electrodes used for communicating the signal.