A near field communication antenna device

Abstract

The invention belongs to the field of wireless communication, and relates to an antenna device used in a short-distance wireless communication system. The antenna device is an antenna device formed in a mobile electronic device, including: a coil conductor, a flexible substrate, a magnetic material and a shell conductor layer. The coil conductor is an annular or helical coil with the winding center as the coil opening, and the flexible substrate attached to it is assembled on the surface of the magnetic sheet material. The shell conductor layer divides the shielding of the coil conductor into two areas: the first area is the shielding part of the non-shell conductor layer, that is, the actual magnetic link coupling part of the antenna, and the coil conductor of this part adopts a narrow line width design or most of it adopts a narrow line width design , and use the parallel design of double conductor layers; the second area is the shielding part of the shell conductor layer, and the coil conductor in this area is designed with wide lines. The invention has the positive effects of not destroying the structural integrity of the metal part of the casing of the mobile device, occupying a small space and having high performance.

Description

technical field [0001] The present invention relates to an antenna device used in an RFID system, an NFC system, and a short-distance wireless communication system that communicate 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, especially the promotion and application of NFC systems in the financial field. In order to communicate between mobile electronic devices or between mobile electronic devices and basic card reading devices, each device, especially the handheld mobile electronic device, is equipped with a communication antenna for the NFC system. 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 r...

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Problems solved by technology

[0004] However, the solution provided by it has the following problems: 1. The structure of this scheme needs to open a hole in the conductor layer covered by the antenna, and needs to make a gap on one side of the hole, which structurally destroys the integrity of the conductor layer. The design of the shell structure of the equipment does not allow openings to damage its appearance integrity or structural support characteristics, so this solution is subject to great application restrictions; 2. In this solution, the electromagnetic field generated by the antenna needs to bypass the conductor layer, and the electromagnetic field 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. The solution is that the antenna is assembled on a wider conductor layer, that is, when the metal casing moves larger In the device terminal, its effect will be affected

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