Transmission device and near field communication device using the same

摘要

A transmission device for a near field communication (NFC) device includes a matching circuit, a connecting interface with a first width for connecting an operating circuit of the NFC device, a first transmission line electrically connected between an antenna of the NFC device and the matching circuit, and a second transmission line electrically connected between connecting interface and the matching circuit, including an increasing width portion and a constant width portion, wherein a width of the second transmission increases from the first width to a second width within the increasing width portion and keeps the second width within the constant width portion, wherein the second width is greater than and related to the first width.

主权项

1. A transmission device for a near field communication device, comprising:
a matching circuit; a connecting interface with a first width, for connecting an operating circuit of the near field communication device, wherein the connecting interface comprises a plurality of detachable pins to take the connecting interface off the operating circuit; a first transmission line, electrically connected between an antenna of the near field communication device and the matching circuit; and a second transmission line comprising a plurality of metal wires, electrically connected between the connecting interface and the matching circuit, comprising an increasing width portion and a constant width portion, wherein the first transmission line or the second transmission line is flexible, wherein one of the metal wires of the second transmission line is configured for grounding and has a width larger than widths of the other metal wires of the second transmission line, wherein a width of the second transmission line within the increasing width portion increases from the first width to a second width, a width of the second transmission line within the constant width portion substantially maintains the second width, and the second width is greater than and related to the first width.