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Ultra wide band high-performance NFC antenna system based on metal back shell

A metal back shell and antenna system technology, applied to loop antennas with ferromagnetic material cores, antennas, antenna components, etc., can solve problems such as weakening, and achieve the effect of covering frequency bandwidth, easy implementation, and good experience

Active Publication Date: 2017-07-21
SHENZHEN SUNWAY COMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] As we all know, the NFC antenna is usually pasted on the back shell of the mobile phone. When the back shell of the mobile phone is made of metal, it will greatly weaken or even shield the signal of the NFC antenna. Therefore, when the back shell of the mobile phone is made of metal, how to design a high Performance NFC antenna has become a research topic for many people

Method used

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  • Ultra wide band high-performance NFC antenna system based on metal back shell
  • Ultra wide band high-performance NFC antenna system based on metal back shell
  • Ultra wide band high-performance NFC antenna system based on metal back shell

Examples

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Comparison scheme
Effect test

Embodiment 1

[0041] see figure 1 as shown, figure 1 It is a schematic structural diagram of the NFC antenna system according to the first embodiment of the present invention. In the NFC antenna system described in this embodiment, the coordinate axis +X represents pointing to the handset side along the long side of the mobile phone, -X represents pointing to the button side of the mobile phone along the long side of the mobile phone, +Z represents pointing to the screen direction along the mobile phone, and -Z represents Point the phone in the direction of the back case of the phone.

[0042] Wherein the antenna system includes a back shell, which includes a metal back shell 200 and a non-metallic back shell 202, wherein the material of the non-metallic back shell 202 is usually plastic, glass, resin, foam, etc. or composite materials composed of them, metal The connection between the rear shell 200 and the non-metallic rear shell 202 is usually performed by nano-injection molding proces...

Embodiment 2

[0068] Such as Figure 14 as shown, Figure 14 It is a schematic structural diagram of the NFC antenna system according to the second embodiment of the present invention.

[0069] Compared with Embodiment 1, this embodiment differs in that the resonator set on the non-metal back shell 202 is a sheet metal piece 203, and one end of the sheet metal piece 203 connects with the metal back shell through a metal strip 204. 200, and the other end is connected to the metal rear case 200 through a first adjustment capacitor 2; and the metal rear case 200, the metal strip 204, the sheet metal piece 203, and the first adjustment capacitor 2 form a second resonant current loop, through Adjusting the first adjustment capacitor 2 can make the sheet metal part 203 generate a second resonance.

[0070] The working principle of the antenna system described in this embodiment is: an electric signal is sent from the transmitting end of the NFC chip 1 of the mobile phone, adjusting the peripher...

Embodiment 3

[0078] Such as Figure 15 as shown, Figure 15 It is a schematic structural diagram of the NFC antenna system according to the third embodiment of the present invention.

[0079] Compared with Embodiment 1, the difference between this embodiment and the first embodiment is that the area of ​​the non-metal back shell 202 is greatly reduced; The metal back shell 200 is connected, and the other end is connected to the metal back shell 200 through a first adjustment capacitor 2; and the metal back shell 200, the metal strip 204, the ring metal 201, and the first adjustment capacitor 2 form a second resonant current loop , the ring metal 201 can generate a second resonance by adjusting the first adjustment capacitor 2 .

[0080] The working principle of the antenna system described in this embodiment is: an electric signal is sent from the transmitting end of the NFC chip 1 of the mobile phone, adjusting the peripheral matching circuit of the NFC chip 1 of the mobile phone can ma...

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Abstract

The invention provides an ultra wide band high-performance NFC antenna system based on a metal back shell. By adjusting a matching circuit between a chip and an NFC antenna, the NFC antenna resonance is allowed to be in the first resonance frequency, and the NFC antenna is allowed to motivate sensing current on the metal back shell. On one hand, the metal back shell and the NFC antenna transmit the signal in a near field format to a receiving device and interact with the receiving device together, and on the other hand, current on the metal back shell passes a resonance piece and a first adjusting capacitor and then flows back to the metal back shell to form a current loop. Through the first adjusting capacitor, the resonance of the current loop is allowed to be in the second resonance frequency, thereby achieving overlapping of the second resonance and the first resonance. Compared with the prior art, the system is simple in structure, and easy to realize; wide frequency bands are covered; magnetic field intensity and working distance of a work frequency segment are improved; NFC performance of an electronic device based on metal back shell materials is greatly improved; and better experience is brought to users.

Description

technical field [0001] The invention belongs to the technical field of near-field communication, and specifically relates to antennas, and more specifically, to a multi-resonance ultra-wideband high-performance NFC antenna system, mainly aimed at mobile terminal equipment with metal back shells. Background technique [0002] NFC near-field communication technology is evolved from the integration of non-contact radio frequency identification (RFID) and interconnection technology. The working frequency is 13.56MHz, and it can support three working modes of reading and writing, card simulation and P2P peer-to-peer. Because NFC technology can identify and exchange data with compatible devices within a short distance, full-featured electronic devices with NFC can replace transportation cards, bank cards, wallets, airport boarding passes, building access keys, etc. Provides great convenience. [0003] On the other hand, metal materials such as aluminum, magnesium, stainless steel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q1/24H01Q1/36H01Q23/00H01Q7/06H01Q5/307
CPCH01Q1/244H01Q1/36H01Q5/307H01Q7/06H01Q23/00
Inventor 赵安平艾付强
Owner SHENZHEN SUNWAY COMM
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