CN104682005A - Antenna structure - Google Patents

Abstract

The invention provides an antenna structure, which comprises a metal plate and a coil unit. The metal plate includes a slit penetrating the metal plate to divide the metal plate into a first metal plate region and a second metal plate region. The center of the coil unit includes a coil opening. The coil unit is arranged on one side of the metal plate, and at least one part of the coil opening of the coil unit is exposed by the gap of the metal plate.

Description

antenna structure

technical field

The invention relates to an antenna structure, in particular to an antenna structure with slots on a metal plate.

Background technique

Near Field Communication (NFC) is a short-distance high-frequency wireless communication technology. Its main feature is to enable rapid non-contact point-to-point data transmission between electronic devices within a short distance. Since devices with near field communication chips can sense each other without contact, there are considerable advantages when the near field communication technology is applied to mobile commerce, e-commerce, and identification. With the gradual popularization of mobile phones, there are currently near-field communication technologies applied to mobile phones to increase the convenience of consumers' lives. For example, a mobile phone with a near-field communication chip card can use The near-field communication chip card is used as an electronic currency wallet to purchase commodities, or the near-field communication chip card is used as an identification certificate. In this way, consumers only need to take their mobile phones with them when they go out, instead of carrying their wallets and certificates to go out.

However, in various applications of near-field communication technology today, due to the limited sensing distance between the vehicle and the sensing device, it often happens that the user must put the vehicle close to the sensing device to perform the sensing operation, which causes many problems. It is inconvenient to use, and if NFC is applied to a vehicle with a metal casing, the metal casing will shield the magnetic field used by NFC to transmit signals and energy, reducing the sensing distance between the vehicle and the sensing device. In view of this, the inventors have devoted themselves to research and combined with the application of theories, and proposed an invention with a reasonable design and an effective solution to the above-mentioned problems.

Contents of the invention

The main purpose of the present invention is to provide an antenna structure, which effectively improves the effective identification distance and data transmission quality of radio frequency identification by opening a slit in the metal plate to expose the coil opening of the coil unit.

In order to achieve the above object, the present invention provides an antenna structure, which includes: a metal plate and a coil unit. The metal plate includes a slit, and the slit penetrates the metal plate to separate the metal plate into a first metal plate area and a second metal plate area. The center of the coil unit includes a coil opening, the coil unit is disposed on one side of the metal plate, and the gap of the metal plate corresponds to at least a part of the coil opening of the bare coil unit.

Furthermore, an insulator may be provided in the slot to connect the first metal plate area and the second metal plate area. The metal plate is arranged on one side of the coil unit, and the gap of the metal plate can expose at least one-third of the coil opening. The slit includes at least two slit parts, and each of the slit parts communicates with each other. The slit includes a first slit portion and a second slit portion, the first slit portion and the second slit portion communicate with each other, when the metal plate is arranged on one side of the coil unit, the first slit portion or the second slit portion The second slit part exposes the coil opening of the coil unit; the slit includes a first slit part, a second slit part and a third slit part, and the second slit part is connected to the first slit part and the third slit part respectively. The slits communicate with each other, and when the metal plate is disposed on one side of the coil unit, the first slit, the second slit or the third slit exposes the coil opening of the coil unit. Openings at both ends of the slit can be respectively arranged on different sides or the same side of the metal plate; for example, the metal plate can include a first short side, a second short side, a first A rectangular plate body with a long side and a second long side, the opening at one end of the slit can be arranged on one of the first short side, the second short side, the first long side and the second long side, and the other end of the slit The opening may be disposed on one of the first short side, the second short side, the first long side and the second long side. The coil unit is disposed on a base plate, and the metal plate is covered on the base plate. The slit of the metal plate corresponds to exposing at least a part of the coil opening of the coil unit. The substrate also includes a feed-in portion, and the feed-in portion includes two feed-in points, and two ends of the coil unit are respectively connected to each of the feed-in points. The current direction of the coil unit is the same as the induced current direction of the first metal plate area and the second metal plate area of the metal plate.

The beneficial effects of the present invention may be that, the present invention is provided with a slit penetrating through the metal plate on the metal plate in the antenna structure to expose the coil opening of the coil unit, thereby effectively improving the effective identification distance of radio frequency identification and its Data transmission quality.

In order to further understand the features and technical contents of the present invention, please refer to the following detailed description and drawings related to the present invention. However, the attached drawings are provided for reference and illustration only, and are not intended to limit the present invention.

Description of drawings

Fig. 1 is the first schematic diagram of the first embodiment of the antenna structure of the present invention;

2 is a second schematic diagram of the first embodiment of the antenna structure of the present invention;

Fig. 3 is another schematic diagram of the first embodiment of the antenna structure of the present invention;

Fig. 4 is the first schematic diagram of the second embodiment of the antenna structure of the present invention;

5 is a second schematic diagram of a second embodiment of the antenna structure of the present invention;

Fig. 6 is another schematic diagram of the second embodiment of the antenna structure of the present invention;

7 is a first schematic diagram of a third embodiment of the antenna structure of the present invention;

8 is a second schematic diagram of a third embodiment of the antenna structure of the present invention;

FIG. 9 is another schematic diagram of the third embodiment of the antenna structure of the present invention;

FIG. 10 is a schematic diagram of a fourth embodiment of the antenna structure of the present invention.

Explanation of reference signs:

1-antenna structure; 10-metal plate; 101-first metal plate area; 102-second metal plate area; 11-slot; 111-first slot; 112-second slot; 113-third slot ;20-coil unit; 201-coil opening; 30-substrate; 301-feed-in part; 31-connecting line; 40-insulator; H1-slot width; H2-coil opening width; L1-coil unit current direction; L2- The first metal plate area induces the current direction; L3-the second metal plate area induces the current direction.

Detailed ways

In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will describe in detail with reference to the drawings and specific embodiments.

[First embodiment]

Please refer to FIG. 1 and FIG. 2 together, which are schematic views of the first embodiment of the antenna structure of the present invention. As shown in the figure, the antenna structure 1 includes: a metal plate 10 and a coil unit 20 . The metal plate 10 includes a slit 11 . Openings at both ends of the slit 11 are respectively arranged on different sides of the metal plate 10, for example, on two corresponding long sides (or short sides) of the metal plate 10, and the metal plate 10 is divided into one according to this. A first metal plate area 101 and a second metal plate area 102 . In practical applications, the openings at both ends of the slit 11 can be respectively arranged on the corresponding two sides or the adjacent two sides of the metal plate 10 according to the requirement, which is not limited in the drawing; The shape of the metal plate 10 can also be any shape according to requirements.

The center of the coil unit 20 has a coil opening 201 . As shown in FIG. 2 , when the metal plate 10 is covered on the coil unit 20 , the gap 11 of the metal plate 10 exposes at least a part of the coil opening 201 of the coil unit 20 . In practical applications, preferably, the width H1 of the slit 11 may be at least one-third greater than the width H2 of the coil opening 201; mathematically, it may be expressed as: H1>H2/3. Wherein, the material of the metal plate 10 and the coil unit 20 can be selected according to actual requirements, preferably copper. In addition, the shape (similar to a rectangle) of the coil unit 20 in the drawing is only one example and is not limited thereto. For example, it may also be a circle. In particular, the shape of the two corresponding sides of the slit 11 of the metal plate 10 in the figure is taken as an example of two approximately parallel sides, which are not limited to this in practical applications. For example That is to say, the two sides of the slit 11 may also be non-parallel, that is to say, the openings at both ends of the slit 11 may be arranged at non-corresponding positions of the metal plate 10 .

As shown in FIG. 3 , the slit 11 may correspond to the position of the coil opening 201 of the coil unit 20 and have different widths. For example, the position of the slit 11 corresponding to the coil opening 201 may have a relatively large width (compared to Preferably, it is larger than one-third of the coil opening 201 ), while the width of the rest of the slit 11 (the part not used to expose the coil opening 201 ) can be relatively small. It is worth mentioning that, in this embodiment, the central part of the slit 11 with a wider width is taken as a rectangle as an example. In actual application, it can be designed according to actual needs. For example, it can be based on the shape of the coil opening 201. The outer shape is determined, for example, the coil opening 201 is circular, and the center width of the slit 11 is relatively wide, which can be correspondingly circular.

[Second Embodiment]

Please refer to FIG. 4 and FIG. 5 together, which are schematic diagrams of a second embodiment of the antenna structure of the present invention. Different from the above-mentioned embodiments, the openings at both ends of the slit 11 of the metal plate 10 are respectively arranged on the corresponding two sides of the metal plate 10, for example, on the two long sides and the two short sides. Openings at both ends of the slit 11 are respectively arranged on adjacent sides of the metal plate 10, for example, one end of the slit 11 is set on the long side of the metal plate 10, and the other end of the slit 11 is set on the short side of the metal plate 10 superior. As shown in the figure, the antenna structure 1 includes: a metal plate 10 , a coil unit 20 and a substrate 30 . The metal plate 10 includes a slit 11 , which penetrates the metal plate 10 and thereby separates the metal plate 10 into a first metal plate region 101 and a second metal plate region 102 . Openings at both ends of the slit 11 are respectively arranged on one of the short sides and one of the long sides of the metal plate 10, and present a shape similar to L; furthermore, the slit 11 may include a first slit portion 111 and a second The slit portion 112 , and the first slit portion 111 and the second slit portion 112 communicate with each other. In particular, the slit 11 in the drawings of this embodiment is taken as an example to include two interconnected first slit parts 111 and second slit parts 112, but it is not limited thereto. Composition of gaps. The coil unit 20 includes a coil opening 201 , and the coil unit 20 is disposed on the substrate 30 . Preferably, the substrate 30 may be a copper-free substrate, such as a glass fiber material (FR4 material).

The metal plate 10 is disposed on the substrate 30 , and the slit 11 of the metal plate 10 exposes at least a part of the coil opening 201 of the coil unit 20 (preferably, at least one-third of the coil opening 201 is exposed). Wherein, the base plate 30 may be smaller than or equal to the size of the metal plate 10, and the coil unit 20 may be fixed on the base plate 30 by bonding, gluing, welding, etc., and there is no limitation here. It is worth mentioning that although the first slit 111 of the metal plate 10 is used to expose the coil opening 201 of the coil unit 20 in the drawings, it is not limited thereto, and the metal plate 10 can pass through any position of the slit 11 ( For example: the second slit portion 112 or the joint between the two slit portions) to expose the coil opening 201 of the coil unit 20 .

In addition, as shown in FIG. 6 , in other aspects, the slit 11 may be in the shape of a circular arc, and the coil opening 201 of the coil unit 20 is exposed through the middle arc section of the slit 11 . It is particularly emphasized that the width and shape of the slits shown in the drawings of this embodiment are just one example, which can be changed according to actual needs.

[Third Embodiment]

Please refer to FIG. 7 and FIG. 8 together, which are schematic diagrams of a third embodiment of the antenna structure of the present invention. As shown in the figure, the antenna structure 1 includes: a metal plate 10, a coil unit 20 and a substrate 30; the difference between this embodiment and the above embodiment is that the openings at both ends of the slit 11 of the metal plate 10 can be arranged on On the same side of the metal plate 10; the slit 11 can include a first slit portion 111, a second slit portion 112 and a third slit portion 113, and the second slit portion 112 is respectively connected to the first slit portion 111 and the third slit portion. The slits 113 communicate with each other. As shown in Figure 8, the size of the substrate 30 and the location thereof can be changed according to actual needs, for example, the substrate 30 can be smaller than or equal to the size of the metal plate 10, and at least one side of the substrate 30 can be made of metal The plates 10 are aligned, and the coil opening 201 of the coil unit 20 can be located at the corresponding position of the second slit 112; The second slit portion 112 of the metal plate 10 is used to expose the coil opening 201 of the coil unit 20; of course, in other aspects, it can also be connected by using the first slit portion 111, the third slit portion 113 of the metal plate 10, or each slit portion part to expose the coil opening 201 of the coil unit 20 . As shown in Fig. 9, in another special application, the slit 11 of the metal plate 10 can have an arc shape; and one side of the substrate 30 can be flush with the metal plate 10, and can be made of The coil opening 201 of the coil unit 20 is exposed in the middle arc portion of the slit 11 of the board 10 .

[Fourth Embodiment]

Please refer to FIG. 10 , which is a schematic diagram of a fourth embodiment of the antenna structure of the present invention. As shown in the figure, the antenna structure 1 includes a metal plate 10 , a coil unit 20 and a substrate 30 . The metal plate 10 includes a slit 11, the slit 11 penetrates the metal plate 10, and thereby separates the metal plate 10 into a first metal plate area 101 and a second metal plate area 102, and an insulating material is filled in the slit 11. The object 40 is used for connecting the first metal plate area 101 and the second metal plate area 102 of the metal plate 10 . Wherein, the insulator 40 can be selected according to actual requirements, such as plastic or glass. The coil unit 20 is disposed on the substrate 30 . The substrate 30 may include a feed-in portion 301, which may include two feed-in points (not labeled), and the two ends of the coil unit 20 may be respectively connected to each of the feed-in points; The other side of the coil unit 20 may include a connection wire 31 , the two ends of which are respectively connected to the feeding point of the unconnected coil unit 20 and the terminal at the center of the coil unit 20 . In addition, it is worth mentioning that the pattern of the slit 11 of the metal plate 10 in the drawings of this embodiment can be the pattern of any of the above-mentioned embodiments, or can be changed according to requirements, and is not limited to the drawings.

In a preferred practical application, the above-mentioned embodiment may be applied to handheld electronic communication devices, such as smart phones, tablet computers, and the like. And the metal plate 10 can be used as the shell of the handheld electronic communication device; or the metal plate 10 can be arranged inside the plastic shell of the handheld electronic communication device, and can be the plastic shell and the above-mentioned stuffing in the metal plate 10 The insulator 40 of the slot 11 is connected.

In addition, it is particularly noted that when the coil unit 20 is energized, the induced currents L2 and L3 induced by the first metal plate area 101 and the second metal plate area 102 of the metal plate 10 can be in the same direction as the coil unit 20. L1 is the same, for example, it is counterclockwise as shown in the figure.

However, the above descriptions are only preferred embodiments of the present invention, and are not intended to limit the scope of patent protection of the present invention. Therefore, all equivalent changes made by using the description and drawings of the present invention are all included in the scope of the present invention. Within the scope of rights protection, I agree with Chen Ming.

Claims (10)

1. an antenna structure, is characterized in that, described antenna structure comprises:

One metallic plate, it comprises a slot, and this slot penetrates this metallic plate, this metallic plate to be divided into one first metal plate area and one second metal plate area; And

One coil unit, wherein pericardium is containing a coil aperture, and this coil unit is arranged at the side of this metallic plate, and this coil aperture of corresponding this coil unit exposed of this slot of this metallic plate at least partially.

2. antenna structure according to claim 1, is characterized in that, this slot is provided with an insulant, to connect this first metal plate area and this second metal plate area.

3. antenna structure according to claim 1, is characterized in that, this metallic plate is arranged at the side of this coil unit, and this coil aperture of this slot exposed 1/3 of this metallic plate.

4. antenna structure according to claim 1, is characterized in that, this slot comprises at least two slot portions, and respectively this slot portion is interconnected.

5. antenna structure according to claim 1, it is characterized in that, this slot comprises one first slot portion and one second slot portion, this the first slot portion and this second slot portion are interconnected, when this metallic plate is arranged at the side of this coil unit, this coil aperture of this first slot portion or this second slot portion this coil unit exposed.

6. antenna structure according to claim 1, it is characterized in that, this slot comprises one first slot portion, one second slot portion and a treble-slot portion, this the second slot portion is interconnected with this first slot portion and this treble-slot portion respectively, when this metallic plate is arranged at the side of this coil unit, this coil aperture of this first slot portion, this second slot portion or this treble-slot portion this coil unit exposed.

7. antenna structure according to claim 1, is characterized in that, the both ends open of this slot is arranged at the different dual-side of this metallic plate or identical side respectively.

8. antenna structure according to claim 1, is characterized in that, this coil unit is arranged on a substrate, and this metallic plate is covered on this substrate, and this coil aperture of corresponding this coil unit exposed of this slot of this metallic plate at least partially.

9. antenna structure according to claim 8, is characterized in that, this substrate also comprises a feeding portion, and this feeding portion comprises two load points, and the two ends of this coil unit are connected to respectively this load point respectively.

10. antenna structure according to claim 1, is characterized in that, the sense of current of this coil unit is identical with the inductive current direction of this first metal plate area of this metallic plate and this second metal plate area.