A near field communication antenna device

Abstract

A near-field communication antenna device belongs to the field of wireless communication. The antenna device is an antenna device constituted in electronic equipment, including a shell conductor layer, a first insulating layer, a first coil conductor, a flexible substrate, a second coil conductor, a second insulating layer and a magnetic material layer; the first coil conductor and the The second coil conductors are respectively located on both sides of the flexible substrate and connected through via holes; when looking down on the first coil conductor, the first coil conductor is divided into: the first area, the wires of the first coil conductor and the second coil conductor completely overlap or partially overlap ; In the second area, the wires of the first coil conductor and the second coil conductor do not overlap at all or partially; the surfaces of the coil conductors on both sides of the flexible substrate are insulated; the shell conductor layer completely covers the second area and does not cover the second area at all. an area. The antenna device realizes long-distance communication without damaging the metal structure of the shell of the electronic equipment; and on the basis of ensuring the communication distance of the antenna, the size of the antenna device is reduced.

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, 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...

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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

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