TWI862082B - Planar antenna structure and signal reader comprising the same - Google Patents

Abstract

The present disclosure provides a planar antenna structure, comprising a first metal layer, a second metal layer, and a buffer insulation layer. The buffer insulation layer is between the first metal layer and the second metal layer. A circuit connector is provided on one side of the second metal layer facing outwards. The signal feed point is insulated from the second metal layer and electrically connected to the first metal layer. There are a first direction and a second direction along the surface of the second metal layer, with the first direction being perpendicular to the second. Along the first direction, there is a first set distance between the center of the signal feed point and the centers of the first metal layer and the second metal layer. Along the second direction, there is a second set distance between the center of the signal feed point and the centers of the first metal layer and the second metal layer.

Description

Planar antenna structure and signal reader including the same

The present invention relates to an antenna structure and a signal reader including the same, and in particular to a planar antenna structure and a signal reader including the same.

Planar antennas have many advantages, such as small size, low cost, simple manufacturing and installation, etc., so they are widely used in the fields of communication and RF applications. In addition, the communication effect is related to the polarization of the antenna, so it is necessary to ensure that the polarization direction of the antenna and the receiver is consistent in order to achieve the best communication effect.

In addition to the characteristics of the antenna itself, there are many dangerous factors in the industrial environment, such as flammable and explosive gases and substances. If electrostatic discharge or other electrical failures occur during the use of the antenna, sparks may be generated, causing these flammable and explosive gases and substances to explode, resulting in damage to the antenna. In many high-risk locations, antenna damage may bring considerable threats and hidden dangers to on-site workers or equipment.

In view of this, the inventor of this case believes that according to the application requirements and installation environment of the antenna, there is still a lot of room for improvement in the conventional planar antenna, and conceives an antenna structure with excellent communication effect and safety to protect the safety of people's lives and property.

The main purpose of the present invention is to provide a planar antenna structure, comprising a first metal layer, a second metal layer, and a buffer insulation layer. The center position of the second metal layer is aligned with the center position of the first metal layer. The buffer insulation layer is arranged between the first metal layer and the second metal layer. A circuit connector is disposed on the outward side of the second metal layer, and the circuit connector includes a signal feed point and a ground feed point. The signal feed point is insulated from the second metal layer and electrically connected to the first metal layer. A first setting distance is provided between the center position of the signal feed point and the center positions in a first direction along the surface of the second metal layer, and a second setting distance is provided between the center position of the signal feed point and the center positions in a second direction along the surface of the second metal layer orthogonal to the first direction.

Furthermore, the first metal layer is an antenna terminal, the second metal layer is a ground terminal, and the surface area of the second metal layer is larger than the surface area of the first metal layer.

Furthermore, the first metal layer and the second metal layer are approximately rectangular, circular, or elliptical in appearance.

Furthermore, the first setting distance is 16 mm, and the second setting distance is 8 mm.

Furthermore, the size of the first metal layer in the first direction is 94.5 mm, and the size in the second direction is 97.5 mm; the size of the second metal layer in the first direction and the second direction are both 120 mm.

Furthermore, the thickness of the buffer insulation layer is 5 mm.

Furthermore, the receiving frequency of the first metal layer is between 902 MHz and 928 MHz.

Furthermore, the material of the first metal layer and/or the second metal layer is aluminum, aluminum alloy, or a conductive metal material; the material of the buffer insulation layer is polycarbonate or an insulating material with a high softening temperature.

Furthermore, an adhesive layer is disposed on two opposite sides of the buffer insulating layer, and the entire surface is attached to the surface of the first metal layer and the second metal layer.

Furthermore, a center positioning mechanism is arranged at the center positions to combine the first metal layer with the second metal layer, and the center positioning mechanism includes a screw and a nut for locking the screw.

Another object of the present invention is to provide a signal reader, comprising the above-mentioned planar antenna structure and a reader housing. The reader housing is used to house the planar antenna structure, and the first metal layer of the planar antenna structure is externally disposed on the reader housing.

Therefore, the planar antenna structure of the present invention is provided with a circuit connector including a signal feed point on the metal layer on one side, and the center position of the signal feed point and the center position of the metal layer have a first setting distance and a second setting distance in two orthogonal directions, respectively, to obtain a better reading rate and reading range. In addition, the first metal layer of the planar antenna structure is placed outside the reader housing, which has an explosion-proof effect.

The detailed description and technical content of the present invention are described below with reference to the accompanying drawings. Furthermore, the drawings in the present invention are for the convenience of explanation, and their proportions may not be drawn according to the actual proportions. Such drawings and their proportions are not intended to limit the scope of the present invention, and are hereby explained in advance.

Please refer to "FIG. 1" and "FIG. 2" below, which are schematic diagrams of the appearance of the planar antenna structure of the present invention at different viewing angles, as shown in the figure: The present invention discloses a planar antenna structure 100, and the planar antenna structure 100 includes a first metal layer 10, a second metal layer 20, and a buffer insulation layer 30. In this embodiment, the first metal layer 10 is an antenna end, and the second metal layer 20 is a ground end, and the surface area of the second metal layer 20 is larger than the surface area of the first metal layer 10.

In one embodiment, the material of the first metal layer 10 and/or the second metal layer 20 is, for example but not limited to, aluminum alloy, copper, copper alloy, or any conductive metal material, and the metal material can be any single metal or other alloy type; and the material of the buffer insulation layer 30 is, for example but not limited to, any engineering plastic material, or an insulating material with a high softening temperature. In this embodiment, the material of the first metal layer 10 and the second metal layer 20 is aluminum, and the material of the buffer insulation layer 30 is polycarbonate.

The first metal layer 10 has a center position, and the center position of the second metal layer 20 is aligned with the center position of the first metal layer 10. The buffer insulation layer 30 is disposed between the first metal layer 10 and the second metal layer 20.

Next, please refer to "Figure 3" which is a front view schematic diagram of one side of the planar antenna structure of the present invention, and please refer to "Figure 1" to "Figure 2" again, as shown in the figure: a circuit connector 21 is provided on the outward side of the second metal layer 20, and the circuit connector 21 includes a signal feed point 211 and a ground feed point 212. The signal feed point 211 is insulated from the second metal layer 20 and electrically connected to the first metal layer 10. The signal feed point 211 is provided with an insulating member 213 on its periphery to insulate the ground feed point 212 and the second metal layer 20. The present invention does not intend to limit the specific implementation contents such as the material and type of the insulating member 213, which are described in advance. In this embodiment, the ground feed point 212 is fixedly arranged on the second metal layer 20 via at least one positioning mechanism F. The positioning mechanism F is a screw locked in a lock hole (not shown) on the outer side of the second metal layer 20, so that the ground feed point 212 is electrically connected to the second metal layer 20.

Next, please refer to "Figure 4" and "Figure 5" together, which are schematic front views and partially transparent side views of the other side of the planar antenna structure of the present invention, and please refer to "Figure 3" again, as shown in the figure: a center positioning mechanism F1 is set on the center positions (the center position of the first metal layer 10 and the center position of the second metal layer 20) to combine the first metal layer 10 with the second metal layer 20. The center positioning mechanism F1 includes a screw F11 and a nut F12 for locking the screw F11, wherein the center positions of the first metal layer 10 and the second metal layer 20 respectively have a through hole (not shown) for the screw F11 to pass through. The present invention forms a loop by the aforementioned "the signal feed point 211 is insulated from the second metal layer 20 and electrically connected to the first metal layer 10", and the ground feed point 212 is electrically connected to the second metal layer 20 through the positioning mechanism F, and then the signal feed point 211 is electrically connected to the ground feed point 212 on the second metal layer 20 through the first metal layer 10 through the center positioning mechanism F1.

The center position of the signal feed point 212 has a first setting distance S1 with respect to the center positions (the center position of the first metal layer 10 and the center position of the second metal layer 20) in a first direction D1 along the surface of the second metal layer 20, and the center position of the signal feed point 212 has a second setting distance S2 with respect to the center positions (the center position of the first metal layer 10 and the center position of the second metal layer 20) in a second direction D2 along the surface of the second metal layer 20 that is orthogonal to the first direction D1.

In this embodiment, the first setting distance S1 is 16 mm, the second setting distance S2 is 8 mm; and the appearance of the first metal layer 10 and the second metal layer 20 is roughly rectangular; and the dimension S3 of the first metal layer 20 in the first direction D1 is 94.5 mm, and the dimension S4 in the second direction D2 is 97.5 mm; and the dimension S5 of the second metal layer 10 in the first direction D1 is 120 mm, and the dimension S6 in the second direction D2 is 120 mm; and the thickness S7 of the buffer insulation layer 30 is 5 mm, and the thickness S7 determines the receiving frequency range of the antenna. The planar antenna structure 100 of the present invention adopts the above-mentioned structural design, so that the receiving frequency of the first metal layer 10 is between 902MHz and 928MHz, and the circular polarization ensures the stability and reliability of the signal, which helps to reduce multi-path interference and improve the problem of signal attenuation or distortion, thereby achieving the effect of obtaining a better reading rate and reading range.

In another embodiment, the appearance of the first metal layer 10 and the second metal layer 20 can be roughly circular, elliptical or other shapes that can be implemented accordingly, and the dimensions of the first metal layer 10, the second metal layer 20, and the buffer insulation layer 30 can be planned and designed according to the requirements of the receiving frequency, which is described here first.

In order to enhance the compactness between the structures, an adhesive layer 40 is provided on two opposite sides of the buffer insulation layer 30, and the adhesive layer 40 is entirely attached to the surface of the first metal layer 10 and the second metal layer 20. The present invention does not intend to limit the specific implementation contents such as the material, type, or coating thickness of the adhesive layer 40, which are described here in advance.

Next, please refer to FIG. 6 , which is a perspective view of the signal reader of the present invention, and refer to FIG. 2 , as shown in the figure:

The present invention further discloses a signal reader R, which includes the planar antenna structure 100 as described above, and a reader housing R1. The reader housing R1 is provided for the planar antenna structure 100, and the first metal layer 10 of the planar antenna structure 100 is externally disposed on the reader housing R1. When encountering a dangerous situation, the first metal layer 10 is externally disposed on the reader housing R1 to achieve an explosion-proof effect on the reader housing R1.

In this embodiment, a corner positioning mechanism F2 is respectively provided at the corner position of the second metal layer 20 to combine the second metal layer 20 with the reader housing R1. The corner positioning mechanism F2 is a screw locked on a lock hole (not shown) on the inner side surface of the reader housing R1. The structure for locking the corner positioning mechanism F2 is, for example but not limited to, a locking column, a locking sheet or any other form that can be implemented to provide fixation, which is integrally formed or separately assembled on the reader housing R1 and has the aforementioned lock hole. The present invention is not limited to this and is described in advance.

In summary, the planar antenna structure of the present invention is provided with a circuit connector including a signal feed point on a metal layer on one side, and the center position of the signal feed point and the center position of the metal layer have a first setting distance and a second setting distance in two orthogonal directions, respectively, to obtain a better reading rate and reading range. In addition, the first metal layer of the planar antenna structure is placed outside the reader housing, which has an explosion-proof effect.

The present invention has been described in detail above. However, what is described above is only one of the preferred embodiments of the present invention and should not be used to limit the scope of implementation of the present invention. That is, all equivalent changes and modifications made according to the scope of the patent application of the present invention should still fall within the scope of the patent of the present invention.

100: Planar antenna structure

10: First metal layer

20: Second metal layer

21: Circuit connector

211:Signal Feedback

212: Ground Feedback

213: Insulation

30: Buffer insulation layer

40: Adhesive layer

D1: First direction

D2: Second direction

S1: First setting distance

S2: Second setting distance

S3~S6: Size

S7: Thickness

F: Positioning mechanism

F1: Central positioning mechanism

F11: Screw

F12: Nut

F2: Corner positioning mechanism

R:Signal reader

R1: Reader housing

FIG1 is a schematic diagram of the appearance of the planar antenna structure of the present invention.

FIG. 2 is a schematic diagram of the appearance of the planar antenna structure of the present invention from another viewing angle.

FIG. 3 is a schematic front view of one side of the planar antenna structure of the present invention.

FIG. 4 is a schematic front view of another side of the planar antenna structure of the present invention.

FIG. 5 is a partially transparent side view of the planar antenna structure of the present invention.

FIG6 is a partially transparent schematic diagram of the signal reader of the present invention.

100: Planar antenna structure

10: First metal layer

20: Second metal layer

30: Buffer insulation layer

F1: Central positioning mechanism

F11: Screw

Claims (9)

A planar antenna structure includes: a first metal layer; a second metal layer, the center position of which is aligned with the center position of the first metal layer; and a buffer insulation layer, which is arranged between the first metal layer and the second metal layer; wherein a circuit connector is arranged on the outward side of the second metal layer, and the circuit connector includes a signal feed point and a ground feed point, the signal feed point is insulated from the second metal layer and electrically connected to the first metal layer, and the center position of the signal feed point and the center positions are located along the surface of the second metal layer. There is a first setting distance in the first direction, and there is a second setting distance between the center position of the signal feed point and the center positions in the second direction along the surface of the second metal layer orthogonal to the first direction; wherein the size of the first metal layer in the first direction is 94.5mm, and the size in the second direction is 97.5mm, the size of the second metal layer in the first direction and the second direction are both 120mm, and the receiving frequency of the first metal layer is between 902MHz and 928MHz. The planar antenna structure as described in claim 1, wherein the first metal layer is an antenna end, the second metal layer is a ground end, and the surface area of the second metal layer is larger than the surface area of the first metal layer. The planar antenna structure as described in claim 2, wherein the first metal layer and the second metal layer are approximately rectangular, circular, or elliptical in appearance. The planar antenna structure as described in claim 3, wherein the first setting distance is 16 mm and the second setting distance is 8 mm. The planar antenna structure as described in claim 4, wherein the thickness of the buffer insulation layer is 5 mm. The planar antenna structure as described in claim 1, wherein the material of the first metal layer and/or the second metal layer is aluminum, aluminum alloy, or a conductive metal material; the material of the buffer insulation layer is polycarbonate or an insulating material with a high softening temperature. As described in claim 1, the planar antenna structure, wherein an adhesive layer is provided on two opposite sides of the buffer insulation layer, and the entire surface is attached to the surface of the first metal layer and the second metal layer. The planar antenna structure as described in claim 1, wherein a center positioning mechanism is provided at the center positions to combine the first metal layer with the second metal layer, and the center positioning mechanism includes a screw and a nut for locking the screw. A signal reader, comprising: a planar antenna structure as described in any one of claims 1 to 8; and a reader housing for the planar antenna structure to be mounted, wherein the first metal layer of the planar antenna structure is externally mounted on the reader housing.

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