Application of near field communication (NFC) antenna in completely closed metal frame

A metal frame and antenna technology, which is applied in the field of wireless communication, can solve problems such as unsatisfactory design solutions, achieve great flexibility and design freedom, reduce design process complexity, and reduce costs

Active Publication Date: 2016-11-09
HUIZHOU SPEED WIRELESS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The NFC antenna solution with metal frame and back cover has been the focus of research and development in the industry in recent years, and most of them are aimed at mobile terminals with three-stage metal back cover. For the design of NFC antenna with a fully closed metal frame, especially in In mobile terminals, it is necessary to minimize the mutual influence between the NFC antenna and the mobile communication antenna. For mobile terminals with a fully closed metal frame, a better design solution has not yet been obtained.

Method used

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  • Application of near field communication (NFC) antenna in completely closed metal frame
  • Application of near field communication (NFC) antenna in completely closed metal frame
  • Application of near field communication (NFC) antenna in completely closed metal frame

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Embodiment 1

[0027] Such as figure 1 As shown, the application of an NFC antenna in a fully closed metal frame, in a mobile terminal with a fully closed metal frame 1, and its back cover 2 is also all metal, and there is a gap between the back cover 2 and the metal frame 1 3. The metal frame 1 is completely closed without any cracks. Except for the necessary openings such as the camera hole 21, the flash hole 22 and the fingerprint recognition hole 23, there are no other redundant holes on the metal back cover, and the gap between the holes is Do not open any narrow or wide gaps. The gap 3 between the metal frame 1 and the back cover 2 is used to separate the frame and the back cover so as to realize the radiation function of the antenna. The present invention can arbitrarily select a part of the metal frame 1 as the main antenna radiator of NFC. At the same time, mobile communication antennas such as main antenna, diversity antenna, GPS antenna and WiFi antenna can be realized through th...

Embodiment 2

[0034] Such as Figure 4 Shown is a schematic structural diagram of the implementation of the NFC antenna in this embodiment. Compared with Embodiment 1, the difference lies in the positions of the feeding point A and the grounding point B. The feeding point A and the grounding point B are in the whole The position on the closed metal frame can be selected according to the needs. The longer the conductor distance between A and B, the larger the area of ​​the circular current loop, that is, the larger the NFC antenna magnetic field working area. In different feed point A and ground point B position schemes , it is necessary to adjust the matching circuit to achieve the required signal frequency band.

[0035] The other unmentioned technical solutions of this embodiment are the same as those of Embodiment 1.

Embodiment 3

[0037] Such as Figure 5 As shown, the difference from other embodiments is that the NFC antenna of this embodiment and the mobile communication antenna share a ground point B, and point B can be directly connected to the ground without connecting any impedance components in series.

[0038] The other unmentioned technical solutions of this embodiment are the same as those of Embodiment 1.

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Abstract

The invention provides application of a near field communication (NFC) antenna in a completely closed metal frame. A mobile terminal with the completely closed metal frame also comprises a rear cover, two arbitrary points on the metal frame are taken as a feeding point and a grounding point of the NFC antenna, meanwhile, two arbitrary points on the metal frame are taken as a feeding point and a grounding point of a mobile communication antenna, the feeding point of the NFC antenna is connected with a radio frequency identification circuit module through a first inductor, and the feeding point of the mobile communication antenna is connected with a mobile communication radio frequency circuit module through a first capacitor. Aiming at the NFC antenna design of the mobile terminal with the completely closed metal frame, the NFC antenna is applied to the mobile terminal with the completely closed metal frame; the problem of mutual influence with various mobile communication antennas is solved by connecting impedance components to the feeding points; and meanwhile, greater flexibility and design freedom are brought to the arrangement of the feeding points and the grounding points by debugging a matching circuit.

Description

technical field [0001] The invention relates to the field of wireless communication, and more specifically, relates to the application of an NFC antenna in a fully enclosed metal frame. Background technique [0002] The rise of wireless payment has brought widespread attention to near-field communication, and the NFC function has almost become a standard configuration of communication terminal equipment. The traditional NFC antenna is implemented by FPC plus ferrite, which is mainly attached to the back cover of the plastic terminal device. However, as the market increasingly favors the use of metal materials, most communication terminal devices use metal frames and metal back covers as their external structures. Because metal materials have shielding and interference characteristics for electromagnetic wave radiation, traditional NFC performance There is a large inhibition, and even the complete loss of NFC function. Therefore, implementing the NFC function on metal frame...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q1/44H01Q1/50H01Q1/52H01Q1/48H01Q1/22
CPCH01Q1/2208H01Q1/44H01Q1/48H01Q1/50H01Q1/52
Inventor 李娜娜龚斯乐俞斌
Owner HUIZHOU SPEED WIRELESS TECH CO LTD
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