CN201303054Y - Electronic terminal device and near-field communication antenna thereof - Google Patents

Abstract

The utility model discloses an electronic terminal device and its near-field communication antenna. The near-field communication antenna includes an antenna bottom plate, an inductance coil on the front of the bottom plate, and an inductance coil on the back of the bottom plate. The center is covered with a magnetic core. The utility model not only reduces the size of the antenna so as not to affect the volume of the NFC electronic terminal product, but also ensures a sufficient working distance through the arrangement of the double-sided coil and the coating of the magnetic core at the center of the coil.

Description

An electronic terminal device and its near-field communication antenna

technical field

The utility model relates to the field of electronic terminal equipment, in particular to an electronic terminal equipment and its near field communication (NFC, Near Field Communication) antenna.

Background technique

NFC technology is a short-range wireless communication technology that works at 13.56MHz. It is evolved from the fusion of radio frequency identification (RFID, Radio Frequency Identification) technology and interconnection technology. After the electronic terminal equipment adopts the NFC solution, it can support non-contact IC card simulation, non-contact IC card reader simulation and short-distance point-to-point communication functions, thereby expanding the application range of electronic terminal equipment.

In the electronic terminal equipment using NFC technology, the transmitting and receiving performance of the NFC antenna determines the communication distance of the NFC electronic terminal equipment and the overall EMC (ElectroMagnetic Compatibility, electromagnetic compatibility) and EMI (electromagnetic interference) performance of the NFC electronic terminal equipment. At present, most of the NFC antennas of NFC electronic terminal equipment are single-sided FPC (Flexible Printed Circuit, flexible circuit board) coil antennas. Smaller NFC antennas, but due to their relatively short communication distances, are only between 0 and 4cm. According to the requirements of the international NFC communication protocol, near-field communication applications require normal operation within a distance of 0 to 10cm. Therefore, how to ensure that the NFC antenna does not affect the size of the NFC electronic terminal product, and how to ensure its sufficient working distance is an urgent problem to be solved.

Utility model content

In view of this, the utility model provides an electronic terminal device and its near-field communication antenna, which can not only ensure that the NFC antenna does not affect the volume of the NFC electronic terminal product, but also ensure its sufficient working distance.

In order to solve the above technical problems, the utility model adopts the following technical solutions:

A near-field communication antenna for electronic terminal equipment, comprising an antenna base plate, an inductance coil on the front of the base plate, and an inductance coil on the back of the base plate.

The magnetic core may be a flexible ferrite core.

The inductance coil on the front side of the base plate and the inductance coil on the back side of the base plate may be fed directly or not.

The antenna base plate is a PCB board or an FPC board.

The winding manner of the inductance coil on the front of the base plate and the inductance coil on the back of the base plate may be a mirror image; the same winding manner may also be adopted.

The shape of the inductance coil on the front side of the bottom plate and the inductance coil on the back side of the bottom plate may be rectangular, circular or spiral.

The utility model also discloses an electronic terminal device including the above-mentioned near-field communication antenna.

The electronic terminal device may be a mobile terminal or a personal digital assistant device.

The utility model not only reduces the size of the antenna so as not to affect the volume of the NFC electronic terminal product, but also ensures a sufficient working distance through the arrangement of the double-sided coil and the coating of the magnetic core at the center of the coil.

Description of drawings

Fig. 1-a is the schematic diagram of the double-sided inductive coil antenna (the front coil and the back coil are wound in the same way) that the front inductive coil does not directly feed power to the back inductive coil according to the specific embodiment of the utility model;

Fig. 1-b is a schematic diagram of a double-sided inductive coil antenna in which the front inductive coil does not directly feed power to the back inductive coil (the winding mode of the front coil and the back coil is a mirror image relationship) according to the specific embodiment of the utility model;

Fig. 2 is a schematic diagram of a double-sided inductive coil antenna in which the front inductive coil directly feeds power to the rear inductive coil according to a specific embodiment of the present invention.

Detailed ways

The utility model will be described in detail below with reference to the accompanying drawings and in conjunction with specific embodiments.

Referring to Fig. 1-a, Fig. 1-b and Fig. 2, the near-field communication antenna according to the specific embodiment of the present invention is provided with an inductance coil on the front and back of the antenna base plate, and the double-sided inductance coil is used to reduce the size of the antenna. Size, and the Q value of the coil is further enhanced by pasting high-permeability flexible ferrite cores 10, 11, 12, 13, 14, and 15 at the center of the front coil and the back coil.

Double-sided inductive coils include two forms: the front coil feeds directly to the back coil and does not feed. Taking the rectangular inductance coil as an example, Fig. 1 is an example diagram of a double-sided inductance coil antenna in which the front inductance coil does not directly feed the back inductance coil. In Fig. 1-a, the front coil and the back coil are wound in the same way. The positive and negative coils are superimposed, and the signal of this double-sided inductive coil antenna is more than 10% stronger than that of the single-sided coil antenna within a distance of 0-10cm. In Figure 1-b, the winding method of the front coil and the back coil is a mirror image relationship. Compared with the single-sided coil antenna, the signal of this double-sided inductive coil antenna is increased by more than 15% within a distance of 0-10cm.

Fig. 2 is the example diagram of the double-sided induction coil antenna that front side induction coil and back side induction coil are directly fed by two feeding points 16, in this example, the winding mode of front side coil and back side coil is mirror image relationship, this direct The double-sided inductive coil antenna in the feed form has a stronger signal than the antenna in the form of no direct feed shown in Figure 1, and can further reduce the size of the coil antenna.

The NFC antenna includes a PCB (printed circuit board) inductive coil antenna and an FPC inductive coil antenna, that is, the antenna bottom plate can be a PCB board or an FPC board. Coil antennas can be wound into rectangular, circular, helical and other shapes.

The utility model adopts the form of a double-sided inductance coil and a flexible ferrite core covered with high magnetic permeability to increase the inductance value and Q value of the coil antenna, increase the mutual inductance of the coil, and thus compensate the small cross-sectional size of the coil , so the coil size can be reduced without reducing the inductance and Q value, ensuring that the near field communication distance will not be shortened.

The utility model is suitable for electronic terminal equipment installed with NFC antennas such as mobile terminals (mobile phones), personal digital assistant equipment (PDA, Personal Digital Assistant).

The above content is a further detailed description of the utility model in combination with specific preferred embodiments, and it cannot be assumed that the specific implementation of the utility model is only limited to these descriptions. For a person of ordinary skill in the technical field to which the utility model belongs, without departing from the concept of the utility model, some simple deduction or substitutions can also be made, which should be regarded as belonging to the protection scope of the utility model.

Claims (10)

1. A near-field communication antenna for an electronic terminal device, characterized in that it comprises an antenna base plate, an inductor coil on the front side of the base plate, and an inductor coil on the back side of the base plate, and the centers of the front inductor coil on the base plate and the inductor coil on the back side of the base plate are covered with magnetic core. 2. The near field communication antenna according to claim 1, wherein the magnetic core is a flexible ferrite core. 3 . The near field communication antenna according to claim 1 , wherein the inductive coil on the front side of the base board is directly fed to the inductive coil on the back side of the base board. 4 . 4 . The near field communication antenna according to claim 1 , wherein the inductive coil on the front side of the base board and the inductive coil on the back side of the base board are not directly fed. 5. The near-field communication antenna according to claim 1, wherein the antenna base plate is a PCB board or an FPC board. 6 . The near field communication antenna according to claim 1 , wherein the winding mode of the inductance coil on the front side of the base board and the inductance coil on the back side of the base board is a mirror image relationship. 7 . 7 . The near field communication antenna according to claim 1 , wherein the inductance coil on the front side of the base board is wound in the same manner as the inductance coil on the back side of the base board. 8 . 8 . The near field communication antenna according to claim 1 , wherein the shape of the inductance coil on the front side of the base board and the inductance coil on the back side of the base board is rectangular, circular or spiral. 9. An electronic terminal device, characterized by comprising the near field communication antenna according to any one of claims 1 to 8. 10. The electronic terminal device according to claim 9, wherein the electronic terminal device is a mobile terminal or a personal digital assistant device.

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