A near field communication antenna device

Abstract

The invention provides a near-field communication antenna device, which belongs to the field of wireless communication. The antenna device is an antenna device formed in a mobile electronic device, including: a shell conductor layer, an insulating layer, a coil conductor, a flexible substrate and a magnetic material layer; The other side of the flexible substrate to which it is attached is equipped with a magnetic material; the shell conductor layer divides the shielding of the coil conductor into two areas: the first area is the non-shell conductor layer shielding part, that is, the actual magnetic link coupling part of the antenna. The area is covered with magnetic materials to improve the magnetic field radiation capability of the antenna; the second area is the shielding part of the shell conductor layer, which is not covered with magnetic materials to reduce the ohmic loss of the antenna caused by the loss of magnetic materials and reduce the The magnetic field density in the area is improved, while reducing the eddy current loss caused by the conductor layer, and improving the reading and writing distance of the antenna device.

Description

technical field [0001] The invention relates to an antenna device used in an RFID system, an NFC system, and a short-distance near-field communication system for communicating with a counterpart device through an electromagnetic field signal. Background technique [0002] In recent years, with the continuous promotion and use of RFID systems and NFC systems, in order to communicate between mobile electronic devices or between mobile electronic devices and basic card reading devices, various devices, especially handheld mobile electronic devices, are equipped with NFC system Communication Antenna. Due to the line width, the existing RFID or NFC antennas are mostly designed with 3 to 4 turns, and are assembled inside the casing of the mobile device. With the emergence of mobile electronic devices equipped with metal casings, the service life of mobile electronic devices and the wear resistance of the device casing have been greatly improved, providing users with a better expe...

AI Technical Summary

Problems solved by technology

However, this solution has the following problems: First, the structure needs to have holes on the conductor layer covering the antenna, and a gap needs to be made on one side of the hole, which structurally destroys the integrity of the conductor layer. If the shell of the mobile device If the structural design does not allow opening holes to destroy its appearance integrity or structural support characteristics, the structure will be subject to great application restrictions; second, in this structure, the electromagnetic field generated by the antenna needs to bypass the conductor layer, and the electromagnetic field is in the In the process of bypassing the conductor layer, the conductor layer will cause greater attenuation to the electromagnetic field, and the degree of attenuation is related to the length of the conductor layer bypassed. Therefore, this structure is used when the antenna is assembled on a wider conductor layer, that is, in a mobile device with a larger metal casing. In the terminal, its communication effect will be affected

Images