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nfc module suitable for metal shell materials

A metal shell and module technology, applied in antenna equipment with additional functions, radiating element structure, loop antenna, etc., can solve the problems of rarely giving external NFC antennas, performance interference, and small internal space of mobile phones, etc. Achieve the effect of being conducive to overall control, solving radiation difficulties, and saving mobile phone space

Active Publication Date: 2021-03-02
上海德门信息技术有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most NFC mobile phones have a built-in NFC chip and an external NFC antenna. As the mobile phone environment is getting worse and worse, the internal space of the mobile phone is getting smaller and smaller. There is little space for an external NFC antenna. The metal back shell of the mobile phone will become the mainstream. , the performance of the conventional NFC antenna in the environment of the metal back shell will be seriously disturbed, because the shielding of the electromagnetic field by the metal back shell makes the conventional NFC antenna form eddy currents, so it is necessary to propose an NFC module based on the metal back shell to solve the current problem. The problem of using the original metal of the mobile phone to radiate NFC performance

Method used

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  • nfc module suitable for metal shell materials

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Effect test

Embodiment 1

[0025] Such as figure 1 As shown, an NFC module suitable for metal shell materials includes an NFC chip 1 sequentially connected, a laminated antenna 2 and an NFC antenna, and the laminated antenna 2 is connected to the NFC antenna through a wiring 3, and the wiring 3 The end is equipped with feed point b1 and feed point b2 connected to the NFC antenna. NFC chip 1 sends out a differential signal and through the adjustment of the chip's external circuit, the best signal is input to the laminated antenna 2. The laminated antenna 2 changes the distribution of the entire NFC magnetic field. , and then connect to the NFC antenna through the feed point b1 and the feed point b2 to realize the NFC function.

Embodiment 2

[0027] The described laminated antenna 2 is a chip device with double helix wiring, which is a laminated antenna that can reduce or eliminate metal casing interference in the prior art, but the use of a laminated antenna alone cannot have limited applicability, and it is not compatible with the NFC chip. Combined with the laminated antenna, it is made into a module, which can be used to solve the NFC radiation problem of various metal back shells. In this embodiment, a commercially available NFC chip with a voltage configuration of 5V is used. The external circuit of the chip is designed with different impedances according to the requirements of different chips, and the impedance is optimized according to the impedance requirements of the applied NFC chip. The trace 3 width is 2mm. The NFC antenna is a coil antenna. When in use, attach the NFC module to the motherboard of the mobile device or stack it separately on the PCD board for use.

Embodiment 3

[0029] The width of trace 3 is 5mm. The NFC antenna is the metal frame of the mobile phone. All the other are with embodiment 1.

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Abstract

The invention relates to an NFC module suitable for metal shell materials, comprising a sequentially connected NFC chip (1), a stacked antenna (2) and an NFC antenna, and the differential signal sent by the NFC chip is connected through the stacked antenna (2) To the NFC antenna to realize the NFC function. Compared with the prior art, the NFC module of the present invention is suitable for laminating the motherboard, or used independently with the antenna, has wide practicability, and is suitable for various mobile phone environments.

Description

technical field [0001] The invention relates to an NFC module, in particular to an NFC module suitable for metal shell materials. Background technique [0002] FC is a wireless connection technology that provides easy, safe, and rapid communication. NFC has the characteristics of short distance, high bandwidth, and low energy consumption. Second, NFC is compatible with existing contactless smart card technology and has become a formal standard supported by more and more major manufacturers. Thirdly, NFC is also a short-range connection protocol that provides easy, safe, rapid and automatic communication between various devices. Compared with other connection methods in the wireless world, NFC is a close-range and private communication method. NFC plays a huge role in the fields of access control, public transportation, and mobile payment. Most NFC mobile phones have a built-in NFC chip and an external NFC antenna. As the mobile phone environment is getting worse and worse...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q1/24H01Q1/36H01Q1/44H01Q1/50H01Q7/00H01Q21/00
CPCH01Q1/242H01Q1/36H01Q1/44H01Q1/50H01Q7/00H01Q21/00
Inventor 苏志祥马超黎鹏
Owner 上海德门信息技术有限公司
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