TWI539659B - Antenna structure with double coil - Google Patents

Description

Double coil antenna structure

The present invention relates to an antenna structure, and more particularly to an antenna structure in which a metal plate includes two semi-closed slots.

With the development of wireless communication technology, users can use wireless communication systems to transmit information without being restricted by terrain, making electronic products using wireless communication technologies, such as Notebook Computer (NB) and Personal Digital Assistant (Personal Digital Assistant). The number and types of portable electronic devices such as PDAs and smart phones are increasing day by day, and the antenna for transmitting and receiving electromagnetic signals becomes one of the most important components in wireless communication devices.

In recent years, Near Field Communication (NFC) technology, which is evolved from the integration of non-contact radio frequency identification (RFID) and interconnection technologies, has the widest range of applications, such as traffic. Inductive cards in the MRT system; recently developed for micropayments and portable electronic devices (eg smart phones), users can use NFC antennas installed in portable electronic devices to directly Payment or stored value is performed on the corresponding sensing device. However, in practical applications, there are still many problems. For example, when applied to a portable electronic device with a metal casing, the metal casing shields the magnetic field generated by the NFC antenna and reduces the energy of the antenna coupling; therefore, how to effectively improve the radio frequency identification The effective identification distance and the quality of data transmission are urgent problems for various manufacturers today. The present inventors have devoted themselves to research and cooperate with the application of the theory, and have proposed a present invention which is reasonable in design and effective in improving the above problems.

The main object of the present invention is to provide a double-coil antenna structure, which is designed to effectively improve radio frequency identification by designing coil openings of two coil units of a bare open-air module by two semi-closed slots included in the metal plate. Effective identification distance and data transmission quality.

In order to achieve the above object, the present invention provides a dual coil antenna structure, comprising: an antenna module and a metal plate. The antenna module includes a first coil unit and a second coil unit coupled to each other, and the current direction of the first coil unit is opposite to the current direction of the second coil unit. The metal plate is disposed on one side of the antenna module, and the metal plate includes a first slot and a second slot. The first slot and the second slot are respectively semi-closed slots, and the first slot and the first slot The two slots are disposed on the same side of the metal plate or on the side of the metal plate.

Further, the first coil unit and the second coil unit may be connected in parallel or in series through a connecting member. The first slot and the second slot of the metal plate may be respectively disposed on opposite sides of the metal plate correspondingly or offset. An insulator or air may be disposed in the first slot and the second slot. The direction of the induced current of the metal plate adjacent to the first slot is opposite to the direction of the current of the first coil unit, and the direction of the induced current of the metal plate adjacent to the second slot is opposite to the direction of the current of the second coil unit.

The invention has the beneficial effects that two semi-closed slots are provided through the metal plate for respectively opening the coil openings of the two coil units of the bare open-air module, thereby effectively improving the effective distance of the antenna transmission and the transmission quality thereof. For a better understanding of the features and technical aspects of the present invention, reference should be made to the accompanying drawings.

1‧‧‧Double coil antenna structure

10‧‧‧Metal plates

11‧‧‧First slot

12‧‧‧Second slot

20‧‧‧Antenna Module

21‧‧‧First coil unit

211‧‧‧First coil opening

22‧‧‧second coil unit

221‧‧‧Second coil opening

30‧‧‧Substrate

301‧‧‧Feeding Department

3011‧‧‧First feed point

3012‧‧‧second feed point

31‧‧‧Connecting line

40‧‧‧Insulators

L1‧‧‧First coil unit current direction

L2‧‧‧second coil unit current direction

L3‧‧‧ first slot induced current direction

L4‧‧‧Second slot induced current direction

1 is a first schematic view of a first embodiment of an antenna structure of a dual coil of the present invention.

2 is a second schematic view of a first embodiment of the antenna structure of the dual coil of the present invention.

3 is a first schematic view of an antenna module of an antenna structure of a dual coil according to the present invention.

4 is a second schematic diagram of an antenna module of the antenna structure of the dual coil of the present invention.

Figure 5 is a first schematic view of a second embodiment of the antenna structure of the dual coil of the present invention.

Figure 6 is a second schematic view of a second embodiment of the antenna structure of the dual coil of the present invention.

Figure 7 is a first schematic view of a third embodiment of the antenna structure of the dual coil of the present invention.

Figure 8 is a second schematic view of a third embodiment of the antenna structure of the dual coil of the present invention.

Figure 9 is a first schematic view showing a fourth embodiment of the antenna structure of the dual coil of the present invention.

Figure 10 is a second schematic view of a fourth embodiment of the antenna structure of the dual coil of the present invention.

Figure 11 is a schematic view showing a fifth embodiment of the antenna structure of the dual coil of the present invention.

[First Embodiment]

Please refer to FIG. 1 and FIG. 2 together, which is a first embodiment of the antenna structure of the dual coil of the present invention. As shown in the figure, the antenna structure 1 of the dual coil includes a metal plate 10 and an antenna module 20, and the metal plate 10 is disposed on one side of the antenna module 20. The metal plate 10 includes a first slot 11 and a second slot 12, and the first slot 11 and the second slot 12 are semi-closed slots, and the first slot 11 and the second slot 12 can They are respectively disposed on the opposite sides of the metal plate 10. The antenna module 20 includes a first coil unit 21 and a second coil unit 22 coupled to each other, and includes a first coil opening 211 and a second coil opening 221, respectively. The current direction L1 of the first coil unit 21 is opposite to the current direction L2 of the second coil unit 22. Preferably, the first slot 11 and the second slot 12 can have the same shape and size.

As shown in FIG. 2, the metal plate 10 is disposed above the antenna module 20, and the first slot 11 of the metal plate 10 corresponds to at least a portion of the first coil opening 211 of the exposed first coil unit 21; and the metal plate 10 The second slot 12 corresponds to at least a portion of the second coil opening 221 of the bare second coil unit 22. In the actual application, the metal plate 10, the first coil unit 21, and the second coil unit 22 may be made of copper.

Specifically, the metal plate 10, the first slot 11 and the second slot are shown in the drawings. The shape of the 12 is exemplified by a rectangle, but the practical application is not limited thereto, and may be changed according to requirements, such as a circle, an arbitrary quadrangle or a polygon, etc.; the first coil unit 21 and the second coil unit 22 are For example, a square-like shape can also be circular or can be changed as needed. Preferably, the outer shape of the first slot 11 and the second slot 12 of the metal plate 10 may be an outer shape corresponding to the first coil opening 211 and the second coil opening 221 of the first coil unit 21, thereby When the metal plate 10 is disposed on the antenna module 20, the first slot 11 and the second slot 12 of the metal plate 10 can effectively expose the first coil opening 211 and the second coil opening 221.

As shown in FIG. 3 and FIG. 4 , in the practical application, the antenna module 20 can be disposed on a substrate 30 , and the first coil unit 21 and the second coil unit 22 can be disposed on the same surface of the substrate 30 . The first coil unit 21 and the second coil unit 22 may be disposed on the substrate 30 by bonding, gluing, soldering, printing, etc., and the substrate 30 may preferably be a non-metallic material, for example, It is a fiberglass substrate such as FR4. Of course, the shape of the substrate 30 can also be changed according to practical needs. In the drawings, only the rectangle is taken as an example, but is not limited thereto.

As shown in FIG. 3 , the substrate 30 can include a feeding portion 301 , and the feeding portion 301 can include a first feeding point 3011 and a second feeding point 3012 . One ends of the first coil unit 21 and the second coil unit 22 may be respectively connected to the first feeding point 3011 and the second feeding point 3012 of the feeding portion 301, and the first coil unit 21 and the second coil unit 22 are The other end may be connected to each other through a connection line 31 provided on the other surface of the substrate 30, whereby the first coil unit 21 and the second coil unit 22 may be disposed on the substrate 30 in series. Briefly, one end of the first coil unit 21 is connected to the first feed point 3011, the other end is connected to the second coil unit 22 through the connection line 31, and the other end of the second coil unit 22 is connected to the second feed point. 3012.

As shown in FIG. 4, the first coil unit 21 and the second coil unit 22 may be disposed on the substrate 30 in parallel. In detail, the first coil unit 21 and One end of the second coil unit 22 is connected to the first feeding point 3011, and the other ends of the first coil unit 21 and the second coil unit 22 are connected to the second through the connecting line 31 disposed on the other surface of the substrate 30. Feed point 3012. In other words, the two ends of the first coil unit 21 are respectively connected to the first feed point 3011 and the second feed point 3012, and the two ends of the second coil unit 22 are also respectively connected to the first feed point 3011 and the second feed. Entry point 3012.

[Second embodiment]

Please refer to FIG. 5 and FIG. 6 together, which are schematic views of a second embodiment of the present invention. As shown, the antenna structure 1 of the dual coil includes a metal plate 10, an antenna module 20, and a substrate 30. The metal plate 10 includes a first slot 11 and a second slot 12 which are offset from each other. For example, the first slot 11 and the second slot 12 may be offset from the metal as shown in the figure. Both sides of the board 10. The antenna module 20 includes a first coil unit 21 and a second coil unit 22 disposed on the same side of the substrate 30. The substrate 30 can include a feed portion 301 that can include a first feed point 3011 and a second feed point 3012. The first coil unit 21 and the second coil unit 22 of the antenna module 20 may be disposed on the substrate 30 in series (as shown in FIG. 3) or in parallel (as shown in FIG. 4) according to actual needs. Referring to the above embodiments, no further details are provided herein.

As shown in FIG. 6 , when the metal plate 10 is disposed on the antenna module 20 , the first slot 11 and the second slot 12 of the metal plate 10 correspond to the first of the first coil unit 21 of the bare open circuit module 20 . The coil opening 211 and the second coil opening 221 of the second coil unit 22. In practice, the first slot 11 and the second slot 12 may be completely exposed to the first coil opening 211 and the second coil opening 221, respectively, or only a portion of the bare coil opening. In addition, the substrate 30 may be smaller than or equal to the size of the metal plate 10, and preferably the side of the substrate 30 may be aligned with the metal plate 10. It is to be noted that the antenna module 20 is preferably smaller than the size of the metal plate 10; that is, when the metal plate 10 is disposed on the antenna module 20, except for the first slot 11 and the second slot 12 Except for the first coil opening 211 of the first coil unit 21 and the second coil opening 221 of the second coil unit 22, the remaining portion of the antenna module 20 is shielded by the metal plate 10.

[Third embodiment]

Please refer to FIG. 7 and FIG. 8 together, which is a schematic diagram of a third embodiment of the antenna structure of the dual coil of the present invention. As shown, the antenna structure 1 of the dual coil includes a metal plate 10, an antenna module 20, and a substrate 30. The first slot 11 and the second slot 12 of the metal plate 10 may be disposed on the same side of the metal plate 10, and the side of the substrate 30 may be a metal plate. 10 is provided with the first slot 11 and the side of the second slot 12 being aligned. For example, the figure is disposed on the long side of the metal plate 10, and of course, it may be disposed on the short side of the metal plate 10. In addition, the first coil unit 21 and the second coil unit 22 are The serial form is an example, but is not limited thereto.

[Fourth embodiment]

Please refer to FIG. 9 and FIG. 10 , which are a fourth embodiment of the antenna structure of the dual coil of the present invention. As shown in the figure, the antenna structure 1 of the dual coil includes: a metal plate 10 and an antenna module. 20 and a substrate 30. The first slot 11 and the second slot 12 of the metal plate 10 may be disposed on adjacent sides of the metal plate 10, and the two sides of the substrate 30 may be respectively separated from the above embodiments. The two side edges of the first slot 11 and the second slot 12 are respectively aligned with the metal plate 10 to be aligned. The appearance of the first coil unit 21 and the second coil unit 22 in the drawing and the manner of connection thereof are not limited to the aspects in the drawings.

[Fifth Embodiment]

Please refer to FIG. 11, which is a fifth embodiment of the present invention. As shown, the antenna structure 1 of the dual coil includes a metal plate 10, an antenna module 20, a substrate 30, and an insulator 40. The metal plate 10 includes a first slot 11 and a second slot 12; the antenna module 20 is disposed on the substrate 30 and includes a first coil unit 21 and a second Coil unit 22. The insulator 40 is optionally filled into the first slot 11 and the second slot 12 of the metal plate 10.

In a preferred embodiment, the antenna structure of the dual coil of the present invention can be applied to a handheld electronic communication device, such as a smart phone, a tablet computer, etc., wherein the metal plate 10 can be a handheld electronic communication device. The back cover, and the first slot 11 and the second slot 12 of the metal plate 10 are filled with the insulator 40; or the hand-held electronic communication device has a plastic back cover, and the metal plate 10 is disposed on the back The inner side of the cover, and the inner side of the back cover protrudes from the first slot 11 and the second slot 12 of the metal plate 10 with corresponding protrusions, thereby forming the first slot 11 and the second slot 12 Cards and each other.

In addition, it is worth mentioning that when the antenna module 20 is energized, the first coil unit 21 and the second coil unit 22 have different current directions, and the induced current direction L3 of the first slot 11 of the metal plate 10 Then, the current direction L1 of the first coil unit 21 is opposite, and the induced current direction L4 of the second slot 12 is opposite to the current direction L2 of the second coil unit 22; in other words, the induced current direction L3 of the first slot 11 is The current direction L2 of the second coil unit 22 is the same, and the induced current direction L4 of the second slot 12 is the same as the current direction L1 of the first coil unit 21.

The above is only the preferred embodiment of the present invention, and is not intended to limit the scope of the invention, and the equivalents of the present invention and the equivalents of the drawings are all included in the present invention. Within the scope of protection, it is given to Chen Ming.

10‧‧‧Metal plates

11‧‧‧First slot

12‧‧‧Second slot

20‧‧‧Antenna Module

21‧‧‧First coil unit

211‧‧‧First coil opening

22‧‧‧second coil unit

221‧‧‧Second coil opening

L1‧‧‧First coil unit current direction

L2‧‧‧second coil unit current direction

Claims (8)

An antenna structure of a dual coil, comprising: an antenna module comprising a first coil unit and a second coil unit coupled to each other, and a current direction of the first coil unit and a current of the second coil unit The metal plate is disposed on one side of the antenna module, and the metal plate includes a first slot and a second slot, and the first slot and the second slot are respectively half a first slot and the second slot are disposed on a same side of the metal plate or a side opposite to the metal plate; wherein the first coil unit and the second coil unit respectively comprise a first coil opening and a second coil opening, and a portion of the first coil opening and a portion of the second coil opening are respectively exposed by the first slot and the second slot, and the first coil opening The other portion and the other portion of the second coil opening are respectively covered by a metal plate. The antenna structure of the dual coil of claim 1, wherein the first coil unit and the second coil unit are connected in parallel or in series through at least one connecting member. The antenna structure of the double coil of claim 1, wherein the first slot and the second slot of the metal plate are respectively disposed on opposite sides of the metal plate. The antenna structure of the double coil according to claim 1, wherein the first slot and the second slot of the metal plate are respectively disposed offset on opposite sides of the metal plate. The antenna structure of the double coil of claim 1, wherein the first slot is provided with an insulator or air. The antenna structure of the double coil of claim 1, wherein the second slot is provided with an insulator or air. The antenna structure of the dual coil of claim 1, wherein an induced current direction of the metal plate adjacent to the first slot is opposite to a current direction of the first coil unit, and The direction of the induced current of the metal plate adjacent to the second slot is opposite to the direction of the current of the second coil unit. The antenna structure of the dual coil of claim 1, wherein the antenna module further comprises a substrate, the first coil unit and the second coil unit are disposed on the substrate, and the first coil unit and the first The two coil units are connected in parallel or in series.