TW202320412A - Light-transmitting antenna - Google Patents

Abstract

A light-transmitting antenna includes a substrate, a first conductive pattern and a second conductive pattern. The first conductive pattern is disposed on a first surface of the substrate, and includes a first feeder unit, a first radiation unit, a first coupling unit, a first parasitic unit, a second radiation unit and a second coupling unit. The first feeder unit is connected to the second radiation unit. The first radiation unit and the second radiation unit are located between the first coupling unit and the second coupling unit. One side of the first parasitic unit is connected to the second coupling unit. The other side of the first parasitic unit is adjacent to the first coupling unit. The second conductive pattern is disposed on a second surface of the substrate, and includes a second feeder unit, a third coupling unit, a second parasitic unit and a fourth coupling unit. The orthogonal projection of the second feeder unit on the first surface overlaps the first feeder unit, the first radiation unit and the second radiation unit. Orthogonal projections of the third coupling unit, the fourth coupling unit and the second parasitic unit on the first surface overlap the first coupling unit, the second coupling unit and the first parasitic unit.

Description

Transparent antenna

The present invention relates to an antenna, and in particular to a light-transmitting antenna.

At present, wireless communication technology gradually adopts relay technology to improve wireless communication coverage area, group mobility, cell-edge throughput of base stations, and provide temporary network deployment methods. In the 5th generation (5G) communication system, in order to improve the coverage of the signal, it is best to install the base station on the middle floor of the building, rather than the roof of the building far from the ground. However, the urban environment is complex, and it is extremely difficult to find a place to install the antenna. If the antenna can be installed on the indoor window and the coverage can be improved through the glass, the light-transmitting antenna adopts a light-transmitting and inconspicuous design, which is both beautiful and functional, and can be saved. A large number of site selection and site installation troubles. Of course, the performance of the light-transmitting antenna also directly affects the user experience of the wireless network.

Embodiments of the present invention provide a transparent antenna with better performance.

The transparent antenna according to the embodiment of the present invention includes a substrate, a first conductive pattern and a second conductive pattern. The substrate has a first surface and a second surface opposite to each other. The first conductive pattern is disposed on the first surface and includes a first feeder unit, a first radiation unit, a first coupling unit, a first parasitic unit, a second radiation unit and a second coupling unit. The first feeder unit is connected to the second radiation unit. The first radiation unit and the second radiation unit are located between the first coupling unit and the second coupling unit. One side of the first parasitic unit is connected to the second coupling unit. The other side of the first parasitic unit is adjacent to the first coupling unit. The second conductive pattern is disposed on the second surface and includes a second feeder unit, a third coupling unit, a second parasitic unit and a fourth coupling unit. The orthographic projection of the second feeder unit on the first surface overlaps the first feeder unit, the first radiation unit and the second radiation unit. The orthographic projection of the third coupling unit on the first surface overlaps the first coupling unit. The orthographic projection of the fourth coupling unit on the first surface overlaps the second coupling unit. An orthographic projection of the second parasitic element on the first surface overlaps the first parasitic element. One side of the second parasitic unit is connected to the fourth coupling unit. The other side of the second parasitic unit is adjacent to the third coupling unit.

Based on the above, the light-transmitting antenna of the embodiment of the present invention has characteristics of broadband, high gain and multi-frequency.

FIG. 1 is a three-dimensional schematic diagram of a transparent antenna according to an embodiment of the present invention. Referring to FIG. 1 , the transparent antenna 100 of this embodiment includes a substrate 110 , a first conductive pattern 120 and a second conductive pattern 130 . The substrate 110 has a first surface 112 and a second surface 114 opposite to each other. The first conductive pattern 120 is disposed on the first surface 112 and includes a first feeder unit 120A, a first radiating unit 120B, a first coupling unit 120D, a first parasitic unit 120E, a second radiating unit 120C and a The second coupling unit 120F. The first feeder unit 120A is connected to the second radiation unit 120C. The first radiation unit 120B and the second radiation unit 120C are located between the first coupling unit 120D and the second coupling unit 120F. One side of the first parasitic unit 120E is connected to the second coupling unit 120F. The other side of the first parasitic unit 120E is adjacent to the first coupling unit 120D. The second conductive pattern 130 is disposed on the second surface 114 and includes a second feeder unit 130A, a third coupling unit 130B, a second parasitic unit 130C, and a fourth coupling unit 130D. The orthographic projection of the second feeder unit 130A on the first surface 112 overlaps the first feeder unit 120A, the first radiation unit 120B and the second radiation unit 120C. The orthographic projection of the third coupling unit 130B on the first surface 112 overlaps the first coupling unit 120D. The orthographic projection of the fourth coupling unit 130D on the first surface 112 overlaps the second coupling unit 120F. The orthographic projection of the second parasitic unit 130C on the first surface 112 overlaps the first parasitic unit 120E. One side of the second parasitic unit 130C is connected to the fourth coupling unit 130D. The other side of the second parasitic unit 130C is adjacent to the third coupling unit 130B.

In the transparent antenna 100 of this embodiment, the first feeder unit 120A of the first conductive pattern 120 and the second feeder unit 130A of the second conductive pattern 130 are coupled to each other, so that signals can be fed in by capacitive feeding. In addition, both the first conductive pattern 120 and the second conductive pattern 130 have high light transmittance, and are suitable for being installed indoors to improve the coverage of the indoor network, avoiding that the antenna is installed outdoors and pulled into the room with a very long cable. The signal loss of the cable does not affect the indoor lighting and maintains the appearance. Moreover, the light-transmitting antenna 100 of this embodiment has characteristics such as full planar current, multi-frequency, narrow beam, and high gain.

In this embodiment, the substrate 110 has no conductive vias. That is, the light-transmitting antenna 100 does not need to provide a conductive through hole that can shield light, but uses the first feeder unit 120A and the second feeder unit 130A to pull the position of signal feeding to the edge of the substrate 110, avoiding the light-transmitting antenna. The central area of 100 creates a light-tight spot that does not interfere with the line of sight and remains aesthetically pleasing. In this embodiment, the transparent antenna 100 may further include a feeder 150 . The first feeder unit 120A and the second feeder unit 130A are respectively electrically connected to the feeder 150 at the edge of the substrate 110 .

In this embodiment, the substrate 110 includes a first substrate 110A and a second substrate 110B stacked on each other. The surface of the first substrate 110A facing away from the second substrate 110B is the first surface 112 . The surface of the second substrate 110B facing away from the first substrate 110A is the second surface 114 . The first substrate 110A and the second substrate 110B are, for example, stacked on each other in direct contact with each other without substantially any gap. Under this framework, the first conductive pattern 120 can be formed on the first substrate 110A by a single-sided process, and the second conductive pattern 130 can also be formed on the second substrate 110B by a single-sided process. The overall process cost is lower and the yield rate is higher. high.

In this embodiment, the transparent antenna 100 further includes an electromagnetic wave reflector 140 stacked with a distance from the substrate 110 . That is, the electromagnetic wave reflecting plate 140 and the substrate 110 are stacked together, but keep a distance from each other. Due to the configuration of the electromagnetic wave reflection plate 140, it has the functions of electromagnetic wave reflection and shielding, which can improve the directivity of the antenna and can also isolate environmental influences. In this embodiment, the transparent antenna 100 has an operating wavelength. The distance D10 between the electromagnetic wave reflecting plate 140 and the substrate 110 is, for example, between 0.25 and 2 times the operating wavelength. For example, the distance D10 between the electromagnetic wave reflecting plate 140 and the substrate 110 may be 3 cm.

In this embodiment, the second conductive pattern 130 is located between the first conductive pattern 120 and the electromagnetic wave reflection plate 140 . However, in other embodiments, the first conductive pattern 120 may also be located between the second conductive pattern 130 and the electromagnetic wave reflection plate 140 .

FIG. 2 is a schematic diagram of the first conductive pattern 120 of the transparent antenna 100 in FIG. 1 . Referring to FIG. 2 , in this embodiment, the first radiation unit 120B and the second radiation unit 120C are trapezoidal. In addition, the first coupling unit 120D and the second coupling unit 120F may also be trapezoidal. In this embodiment, the two base angles of the trapezoids of these radiating units are not equal, but the present invention is not limited thereto. The first radiating unit 120B is not connected to the first coupling unit 120D, and the second radiating unit 120C is not connected to the second coupling unit 120F. The first radiating unit 120B is located between the second radiating unit 120C and the first coupling unit 120D. The second radiating unit 120C is located between the first radiating unit 120B and the second coupling unit 120F.

In this embodiment, the shape of the first radiating unit 120B and the shape of the second radiating unit 120C are a line-symmetrical pattern with the boundary line L10 between the two as a symmetric line. In this embodiment, although the shape of the first radiating unit 120B is not completely line-symmetric with the shape of the second radiating unit 120C, because the second radiating unit 120C has a small gap in the middle part, it is still substantially line-symmetrical. . In this embodiment, the shape of the first coupling unit 120D and the shape of the second coupling unit 120F are line-symmetrical patterns with the boundary line L10 between the two as a line of symmetry. Similarly, the shape of the first coupling unit 120D and the shape of the second coupling unit 120F do not need to be completely line-symmetric, and may only be substantially line-symmetric. In addition, in this embodiment, the shape of the first radiating unit 120B is substantially the same as that of the first coupling unit 120D, but the present invention is not limited thereto.

In this embodiment, the first conductive pattern 120 further has a third parasitic unit 120G. The third parasitic unit 120G is connected to the first coupling unit 120D. The other side of the first parasitic unit 120E is adjacent to the first coupling unit 120D and the third parasitic unit 120G.

FIG. 3 is a schematic diagram of the second conductive pattern 130 of the transparent antenna 100 of FIG. 1 . Referring to FIG. 2 and FIG. 3 , in this embodiment, the third coupling unit 130B and the fourth coupling unit 130D are trapezoidal. In this embodiment, the two base angles of the trapezoids of these radiating units are not equal, but the present invention is not limited thereto. In this embodiment, the second conductive pattern 130 further has a fourth parasitic unit 130E. The fourth parasitic unit 130E is connected to the third coupling unit 130B. The other side of the second parasitic unit 130C is adjacent to the third coupling unit 130B and the fourth parasitic unit 130E. The orthographic projection of the fourth parasitic unit 130E on the first surface 112 overlaps the third parasitic unit 120G.

FIG. 4 is a schematic diagram of the conductive region 142 of the electromagnetic wave reflecting plate 140 of the transparent antenna shown in FIG. 1 . Please refer to FIG. 1 and FIG. 4 , in this embodiment, the electromagnetic wave reflecting plate 140 has a conductive region 142 . Orthographic projections of the second conductive pattern 130 and the first conductive pattern 120 on the electromagnetic wave reflecting plate 140 all fall on the conductive region 142 . Of course, the edge portions of the first feeder unit 120A and the second feeder unit 130A may not fall on the conductive area 142 .

The following data are obtained after simulation with the transparent antenna 100 shown in FIG. 1 and FIG. 2 . Wherein, the dimensions of the three substrates are all 100 mm × 100 mm, the thickness of the conductive pattern is 0.7 mm, the distance between the electromagnetic wave reflecting plate 140 and the substrate 110 is 3 cm, and the second feeder unit 130A is close to the fourth coupling unit 130D. The length of one side is 51 mm, and the length of the side of the second feeder unit 130A close to the third coupling unit 130B is 25 mm. The Front-Back Ratio (Front-Back Ratio) of the transparent antenna 100 at 1.8GHz, 2.1GHz and 3.5GHz is 21.9dB, 52.07dB and 3330.4dB respectively, and the peak gain of the XZ section and the YZ section of the transparent antenna 100 at 1.8GHz ( Peak Gain) are 7.92dB and 7.96dB respectively. The peak gains of the XZ section and the YZ section of the transparent antenna 100 at 2.1GHz are 7.15dB and 7.2dB respectively. The peak gains of the XZ section and the YZ section of the transparent antenna 100 at 3.5GHz The gains are 6.28dB and 8.13dB, respectively. The usable frequency of the light-transmitting antenna 100 around 1.8 GHz is between 1.6 GHz and 2.2 GHz, and the converted antenna bandwidth is 32%, which means it has broadband characteristics. The usable frequency of the light-transmitting antenna 100 around 3.5 GHz is between 1.2 GHz and 4.4 GHz, and the converted antenna bandwidth is 32%, which means it has broadband characteristics.

FIG. 5 is a partial schematic diagram of a first conductive pattern of the transparent antenna of FIG. 1 . Please refer to FIG. 1 and FIG. 5 , in this embodiment, the first conductive pattern 120 and the second conductive pattern 130 are mesh metal. That is to say, in the scope of the first conductive pattern 120 and the second conductive pattern 130 seen in FIG. 1 , it can be seen in the enlarged state that it is made of mesh metal, so light can pass through the mesh of the mesh metal, The first conductive pattern 120 and the second conductive pattern 130 can transmit light. In this embodiment, the mesh metal has a line width W12 and a mesh width W14. Considering the light transmittance, the line width W12 is, for example, between 0.05 times and 0.1 times of the mesh width W14. In addition, if the manufacturing process is feasible, the meshes of the first conductive pattern 120 and the second conductive pattern 130 can be completely overlapped as much as possible to improve light transmittance.

FIG. 6 is a schematic partial cross-sectional view of the first conductive pattern 120 of the transparent antenna shown in FIG. 1 . Please refer to FIG. 6 , in this embodiment, the transparent antenna 100 further includes a protective layer 160 covering the first conductive pattern 120 and the second conductive pattern 130 . The protective layer 160 can protect the first conductive pattern 120 and the second conductive pattern 130 . In addition, by properly selecting the material of the protection layer 160 , the function of refractive index matching can be performed to improve the light transmittance of the light-transmitting antenna 100 . Furthermore, the protective layer 160 can also have conductivity, so as to reduce the overall impedance of the first conductive pattern 120 and the second conductive pattern 130 , thereby improving the efficiency of signal transmission. When the protection layer 160 is conductive, the protection layer 160 does not cover the entire first surface 112 and the second surface 114 . The area covered by the protection layer 160 is approximately equal to the area where the first conductive pattern 120 and the second conductive pattern 130 are distributed, so as to avoid changing the shape of the radiation unit and affecting the signal sending and receiving.

FIG. 7 is a perspective view of a transparent antenna according to another embodiment of the present invention. In FIG. 7 , the dimensions and proportions of each component have been adjusted, which are only for convenience of illustration, not actual dimensions and proportions. Please refer to FIG. 7 , the transparent antenna 200 of this embodiment is substantially the same as the transparent antenna 100 of FIG. 1 , and only the differences between the two will be described here. The substrate 210 of this embodiment further includes an optical adhesive layer 270 disposed between the first substrate 110A and the second substrate 110B. The optical adhesive layer 270 can improve the alignment accuracy of the first conductive pattern 120 and the second conductive pattern 130 . Moreover, selecting a material with an appropriate refractive index as the optical adhesive layer 270 can also improve the light transmittance of the substrate 210 . The transparent antenna 200 of this embodiment may further include an outer frame 280 for fixing the electromagnetic wave reflector 140 , the first substrate 110A and the second substrate 110B.

FIG. 8 is a schematic perspective view of a transparent antenna according to yet another embodiment of the present invention. In FIG. 8 , the dimensions and proportions of each element have been adjusted, which are only for convenience of illustration, rather than actual dimensions and proportions. Please refer to FIG. 8 , the transparent antenna 300 of this embodiment is substantially the same as the transparent antenna 100 of FIG. 1 , the difference is that the substrate 310 of this embodiment is a single substrate instead of a combination of two or more substrates. Therefore, the transparent antenna 300 has better light transmission.

To sum up, the light-transmitting antenna of the present invention can be installed indoors to reduce cable signal loss, and also has the characteristics of full-plane current, multi-frequency, narrow beam, and high gain.

100,200,300: transparent antenna 110,210,310: substrate 110A: first substrate 110B: second substrate 112: first surface 114: second surface 120: the first conductive pattern 120A: The first feeder unit 120B: The first radiation unit 120C: second radiation unit 120D: the first coupling unit 120E: The first parasitic unit 120F: Second coupling unit 120G: The third parasitic unit 130: the second conductive pattern 130A: Second feeder unit 130B: the third coupling unit 130C: Second parasitic unit 130D: The fourth coupling unit 130E: The fourth parasitic unit 140: Electromagnetic wave reflector 142: Conductive area 150: feeder 160: protective layer 270: optical glue layer 280: frame D10: Distance L10: Junction line W12: Line width W14: mesh width

FIG. 1 is a three-dimensional schematic diagram of a transparent antenna according to an embodiment of the present invention. FIG. 2 is a schematic diagram of a first conductive pattern of the transparent antenna of FIG. 1 . FIG. 3 is a schematic diagram of a second conductive pattern of the transparent antenna of FIG. 1 . FIG. 4 is a schematic diagram of the conductive area of the electromagnetic wave reflecting plate of the light-transmitting antenna shown in FIG. 1 . FIG. 5 is a partial schematic diagram of a first conductive pattern of the transparent antenna of FIG. 1 . FIG. 6 is a schematic partial cross-sectional view of a first conductive pattern of the transparent antenna in FIG. 1 . FIG. 7 is a perspective view of a transparent antenna according to another embodiment of the present invention. FIG. 8 is a schematic perspective view of a transparent antenna according to yet another embodiment of the present invention.

100: Transparent antenna

110: Substrate

110A: first substrate

110B: second substrate

112: first surface

114: second surface

120: the first conductive pattern

120A: The first feeder unit

120B: The first radiation unit

120C: second radiation unit

120D: the first coupling unit

120E: The first parasitic unit

120F: Second coupling unit

120G: The third parasitic unit

130: the second conductive pattern

130A: Second feeder unit

130B: the third coupling unit

130C: Second parasitic unit

130D: The fourth coupling unit

130E: The fourth parasitic unit

140: Electromagnetic wave reflector

150: feeder

D10: Distance

Claims (16)

A light-transmitting antenna, comprising: A substrate having a first surface and a second surface opposite to each other; A first conductive pattern, configured on the first surface, and including a first feeder unit, a first radiation unit, a first coupling unit, a first parasitic unit, a second radiation unit and a second coupling unit , wherein the first feeder unit is connected to the second radiating unit, the first radiating unit and the second radiating unit are located between the first coupling unit and the second coupling unit, and one side of the first parasitic unit is connected to the a second coupling unit, the other side of the first parasitic unit is adjacent to the first coupling unit; and A second conductive pattern is arranged on the second surface and includes a second feeder unit, a third coupling unit, a second parasitic unit and a fourth coupling unit, wherein the second feeder unit is on the first surface The orthographic projection on the first surface overlaps the first feeder unit, the first radiating unit and the second radiating unit, the orthographic projection of the third coupling unit on the first surface overlaps the first coupling unit, and the fourth coupling unit is in The orthographic projection on the first surface overlaps the second coupling unit, the orthographic projection of the second parasitic unit on the first surface overlaps the first parasitic unit, and one side of the second parasitic unit is connected to the fourth coupling unit , the other side of the second parasitic unit is adjacent to the third coupling unit. The light-transmitting antenna as claimed in claim 1 further includes an electromagnetic wave reflecting plate stacked with a distance from the substrate. The transparent antenna as claimed in claim 2, wherein the second conductive pattern is located between the first conductive pattern and the electromagnetic wave reflecting plate. The light-transmitting antenna according to claim 2, wherein the electromagnetic wave reflecting plate has a conductive area, and the orthographic projections of the second conductive pattern and the first conductive pattern on the electromagnetic wave reflecting plate all fall on the conductive area. The light-transmitting antenna according to claim 2, wherein the light-transmitting antenna has an operating wavelength, and the distance between the electromagnetic wave reflecting plate and the substrate is between 0.25 and 2 times the operating wavelength. The light-transmitting antenna as claimed in claim 1, wherein the substrate has no conductive vias. The transparent antenna as claimed in claim 1 further includes a feeder, wherein the first feeder unit and the second feeder unit are respectively electrically connected to the feeder at the edge of the substrate. The transparent antenna according to claim 1, wherein the first radiating unit and the second radiating unit are trapezoidal. The transparent antenna according to claim 1, wherein the first coupling unit, the second coupling unit, the third coupling unit and the fourth coupling unit are trapezoidal. The transparent antenna according to claim 1, wherein the first conductive pattern further has a third parasitic unit, the second conductive pattern further has a fourth parasitic unit, and the third parasitic unit is connected to the first coupling unit, The fourth parasitic unit is connected to the third coupling unit, the other side of the first parasitic unit is adjacent to the first coupling unit and the third parasitic unit, and the other side of the second parasitic unit is adjacent to the third coupling unit and the third parasitic unit. For the fourth parasitic unit, the orthographic projection of the fourth parasitic unit on the first surface overlaps the third parasitic unit. The transparent antenna according to claim 1, wherein the substrate includes a first substrate and a second substrate stacked on top of each other, the surface of the first substrate facing away from the second substrate is the first surface, the second The surface of the substrate facing away from the first substrate is the second surface. The transparent antenna as claimed in claim 11, wherein the substrate further includes an optical adhesive layer disposed between the first substrate and the second substrate. The light-transmitting antenna according to claim 1, wherein the shape of the first radiating unit and the shape of the second radiating unit are a line-symmetrical pattern with a boundary line between them as a line of symmetry. The transparent antenna as claimed in claim 1 further includes a protection layer covering the first conductive pattern and the second conductive pattern. The transparent antenna as claimed in claim 1, wherein the first conductive pattern and the second conductive pattern are mesh metal. The light-transmitting antenna according to claim 15, wherein the mesh metal has a line width and a mesh width, and the line width is between 0.05 times and 0.1 times the mesh width.

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