TWM604062U - Dual-band symmetric dipole array antenna - Google Patents

Abstract

A dual-band symmetrical dipole array antenna includes a substrate, a signal transmission layer and a ground layer. The signal transmission layer and the ground layer are respectively arranged on the first and second surfaces of the substrate. The signal transmission layer includes a first transmission line and a plurality of radiating metal parts, and each radiating metal part has a first high frequency part and a first low frequency part. The ground layer includes a second transmission line and a plurality of grounded metal parts, and the orthographic projection of each grounded metal part on the first surface is symmetrical with the corresponding radiating metal part and has a second high frequency part and a second low frequency part. The first transmission line has a signal feeding end extending to the ground layer. The first high-frequency part of each radiating metal part and the second high-frequency part of the symmetrical grounded metal part form a high-frequency antenna unit. The low frequency part and the second low frequency part of the symmetrical grounded metal part form a low frequency antenna unit.

Description

Dual-band symmetrical dipole array antenna

The present invention relates to a dipole array antenna, in particular to a dipole array antenna that provides dual frequency bands and has a symmetrical structure.

With the advent of the network communication generation, the development of communication technology has become more sophisticated, and relatively higher requirements for antenna transmission quality and transmission speed. In order to be able to cope with the new generation of wireless communication technologies (such as 5G communication systems), the bandwidth and gain that the antenna can provide will inevitably become the main research direction.

However, the miniaturization of antenna size is also a market trend. Therefore, while pursuing better transmission quality and transmission speed, the size of the antenna is also one of the considerations. In the antenna-related field, how to increase the bandwidth of the antenna and increase the gain while maintaining the original antenna size is a major issue.

This new model proposes a dual-band symmetrical dipole array antenna, which adopts a dual-band symmetrical array design, while maintaining the original antenna size, increasing the working bandwidth of a specific frequency band and increasing the gain.

According to the present invention, a dual-band symmetrical dipole array antenna is proposed, which includes a substrate, a signal transmission layer and a ground layer. The substrate has a first surface and a second surface opposite to each other. The signal transmission layer and the ground layer are respectively arranged on the first surface and the second surface. The signal transmission layer includes a first transmission line and a plurality of radiating metal parts electrically connected to the first transmission line, and each radiating metal part has a first high frequency part and a first low frequency part. The grounding layer includes a second transmission line and a plurality of grounding metal parts electrically connected to the second transmission line. The orthographic projection of each grounding metal part on the first surface is symmetrical to a corresponding one of the radiating metal parts, and each grounding metal part is grounded. The metal part has a second high frequency part and a second low frequency part. Wherein, the first transmission line and the second transmission line form a transmission line matching network, and the first transmission line has a signal feeding end extending to the ground layer. The two transmission lines are electrically connected to the grounded metal parts, the first high frequency part of each radiating metal part and the second high frequency part of the symmetrical grounded metal part form a high frequency antenna unit, and the first high frequency part of each radiating metal part The low frequency part and the second low frequency part of the symmetrical grounded metal part form a low frequency antenna unit.

To sum up, the dual-band symmetrical dipole array antenna proposed by the present invention is mainly designed by adjusting the low-frequency antenna so that the multiplier has a larger bandwidth at high frequencies and using the coupling between low and high frequencies to design the frequency The wider dual-frequency dipole antenna further combines multiple dual-frequency dipole antennas with transmission line matching lines to form a symmetrical array structure, which can increase the antenna's working bandwidth while maintaining the original antenna size. Increase the gain of the antenna.

The above description of the content of the disclosure and the description of the following embodiments are used to demonstrate and explain the spirit and principle of the present model, and to provide a further explanation of the scope of the patent application of the present model.

1, 3: Dual-band symmetrical dipole array antenna

10, 30: substrate

11-14, 31, 33, 35, 37: Radiation metal part

110, 120, 130, 140, 310, 330, 350, 370: the first high frequency part

111, 121, 131, 141, 311, 331, 351, 371: the first low frequency part

15-18, 32, 34, 36, 38: grounded metal part

150, 160, 170, 180, 320, 340, 360, 380: second high frequency part

151, 161, 171, 181, 321, 341, 361, 381: second low frequency part

19, 39: the first transmission line

19’, 39’: Second transmission line

191~198: conductive section

20~23: Connection part

S1, S1’: first surface

S2, S2’: second surface

D1: Short side direction

D2: Long side direction

SE1, SE2: short side

LE1, LE2: Long side

C1: The first connection point

C2: second connection point

DA1~DA4: Dual-frequency dipole antenna

SL: Signal transmission layer

GL: Ground plane

F: Signal feed end

Fig. 1 is a top view of a dual-band symmetrical dipole array antenna according to an embodiment of the present invention.

Fig. 2 is a bottom view of a dual-band symmetrical dipole array antenna according to an embodiment of the present invention.

3A is a three-dimensional structure diagram of a dual-band symmetrical dipole array antenna according to an embodiment of the present invention.

FIG. 3B is an exploded view of a dual-band symmetrical dipole array antenna according to an embodiment of the present invention.

FIG. 4 is a perspective schematic diagram of a dual-band symmetrical dipole array antenna according to an embodiment of the present invention.

FIG. 5 is a top view of a dual-band symmetrical dipole array antenna according to another embodiment of the present invention.

Fig. 6 is a diagram showing the relationship between return loss/peak gain and frequency of different antennas according to an embodiment of the present invention.

FIG. 7 is a diagram showing the relationship between voltage standing wave ratio and frequency of different antennas according to an embodiment of the present invention.

Fig. 8, Fig. 9 and Fig. 10 are the radiation pattern diagrams of different frequency bands of the dual-band symmetrical dipole array antenna according to different embodiments of the present invention.

The detailed features and advantages of the new model will be described in detail in the following embodiments. The content is sufficient to enable anyone familiar with the relevant skills to understand the technical content of the new model and implement it accordingly, and based on the content disclosed in this specification, the scope of patent application and the drawings. , Anyone who is familiar with relevant skills can easily understand the purpose and advantages of the present invention. The following embodiments further illustrate the viewpoints of the present invention in detail, but do not limit the scope of the present invention by any viewpoint.

Please refer to FIG. 1, FIG. 2, FIG. 3A, and FIG. 3B together, which respectively illustrate a top view, a bottom view, a three-dimensional structure diagram, and an exploded view of a dual-band symmetrical dipole array antenna according to an embodiment of the present invention. As shown in the figure, the dual-band symmetrical dipole array antenna 1 (hereinafter referred to as "antenna 1") includes a substrate 10, a signal transmission layer SL and a ground layer GL. The substrate 10 has a first surface S1 and a second surface S2 opposite to each other. The signal transmission layer SL and the ground layer GL are respectively provided on the first surface S1 and the second surface S2. The signal transmission layer SL includes a first transmission line 19 and a plurality of radiating metal portions 11-14. The first transmission line 19 is electrically connected to the radiating metal parts 11-14. Each radiating metal part has a first high frequency part and a first low frequency part. For example, the radiating metal part 11 has a first high frequency part 110 and a first low frequency part 111, the radiating metal part 12 has a first high frequency part 120 and a first low frequency part 121, and the radiating metal part 13 has a first high frequency part. 130 and the first low frequency part 131, and the radiating metal part 14 has a first high frequency part 140 and a first low frequency part 141.

The ground layer GL includes a second transmission line 19' and a plurality of ground metal parts 15-18, and the second transmission line 19' is electrically connected to the ground metal parts 15-18. The orthographic projection of each grounded metal part on the first surface S1 is symmetrical with the corresponding one of the radiating metal parts. Specifically In other words, the orthographic projections of the ground metal parts 15, 16, 17 and 18 provided on the second surface S2 on the first surface S1 are symmetrical to the radiating metal parts 11, 12, 13, and 14, respectively. Similarly, each grounded metal part has a second high frequency part and a second low frequency part. For example, the ground metal part 15 has a second high frequency part 150 and a second low frequency part 151, the ground metal part 16 has a second high frequency part 160 and a second low frequency part 161, and the ground metal part 17 has a second high frequency part. 170 and the second low frequency part 171, the ground metal part 18 has a second high frequency part 180 and a second low frequency part 181.

More specifically, the substrate 10 has two opposite short sides SE1 and SE2 and two opposite long sides LE1 and LE2. The first high frequency parts 110, 120, 130 and the first low frequency parts 111, 121, 131 all extend along the long side direction D2 of the substrate 10 toward the short side SE1. On the other hand, the second high-frequency parts 150, 160, 170 and the second low-frequency parts 151, 161, and 171 all extend along the long side direction D2 of the substrate 10 toward the short side SE2.

The first transmission line 19 has a signal feed-in terminal F, and the signal feed-in terminal F extends to the second transmission line 19' of the ground layer GL to electrically connect the grounded metal parts 15-18. In more detail, as shown in FIG. 3, the signal feed end F is located in the middle of the first transmission line 19 and extends from the signal layer SL to the second transmission line 19' of the ground layer GL, and is further connected to the ground metal portion 15~ 18. In the embodiment of the present invention, the first transmission line 19 and the second transmission line 19' can become a transmission line matching network.

The first high frequency part of each radiating metal part and the second high frequency part of the symmetrical grounded metal part form a high frequency antenna unit. For example, the first high-frequency portion 110 of the radiating metal portion 11 and the second high-frequency portion 150 of the grounded metal portion 15 form a high-frequency antenna unit, and the first high-frequency portion 120 of the radiating metal portion 12 and the first high-frequency portion 120 of the grounded metal portion 16 The two high frequency parts 160 form a high frequency antenna unit. The first high frequency part 130 of the radiating metal part 13 and the second high frequency part 170 of the grounded metal part 17 form a high frequency antenna unit. The frequency portion 140 and the second high frequency portion 180 of the grounded metal portion 18 form a high frequency antenna unit.

On the other hand, the first low frequency part of each radiating metal part and the second low frequency part of the symmetrical grounded metal part form a low frequency antenna unit. For example, the first low frequency part of the radiating metal part 11 111 and the second low frequency part 151 of the grounded metal part 15 form a low frequency antenna unit. The first low frequency part 121 of the radiating metal part 12 and the second low frequency part 161 of the grounded metal part 16 form a low frequency antenna unit. The first low frequency part 131 and the second low frequency part 171 of the grounded metal part 17 form a low frequency antenna unit, and the first low frequency part 141 of the radiating metal part 14 and the second low frequency part 181 of the grounded metal part 18 form a low frequency antenna unit.

In this embodiment, adjacent high-frequency antenna units and low-frequency antenna units can form a group of dual-frequency dipole antennas. In other words, the antenna 1 with a symmetrical structure of the present invention includes four sets of dual-frequency dipole antennas, namely, the radiating metal portion 11 and the grounded metal portion 15 form a dual-frequency dipole antenna DA1, the radiating metal portion 12 and the grounded metal portion 16 form The dual-frequency dipole antenna DA2, the radiating metal portion 13 and the grounded metal portion 17 form a dual-frequency dipole antenna DA3, and the radiating metal portion 14 and the grounded metal portion 18 form a dual-frequency dipole antenna DA4, as shown in FIG. With the matching of transmission line matching lines, the four sets of dual-frequency dipole antennas can achieve impedance matching during synthesis, and design new resonances for high frequencies (such as 6.5GHz) to make them combined with the original bandwidth (such as 5.5GHz) to be larger Bandwidth.

In an embodiment, the first transmission line 19 extends along the long side direction D2 of the substrate 10 and has a stepped structure in the long side direction D2. This stepped structure has different widths in the longitudinal direction D2. In more detail, the first transmission line 19 has two stepped structures with symmetry along the longitudinal direction D2 based on the signal feeding end F. One stepped structure includes a first conductive structure extending along the longitudinal direction D2 of the substrate. Segment 191, second conductive segment 192, third conductive segment 193, and fourth conductive segment 194, and the other stepped structure includes fifth conductive segment 195, sixth conductive segment 196, and fourth conductive segment 195 extending along the long side direction D2 of the substrate. Seven conductive segments 197 and eighth conductive segments 198. .

For ease of description, one of the stepped structures will be mainly described below. As shown in FIG. 1, the first conductive section 191, the second conductive section 192, the third conductive section 193 and the fourth conductive section 194 are electrically connected in sequence from the signal feeding terminal F toward the short side SE1 of the substrate 10. The first conductive segment 191, the second conductive segment 192, the third conductive segment 193, and the fourth conductive segment 194 have different widths in the short-side direction D1 of the substrate 10.

In detail, the width of the fourth conductive section 194 is greater than the width of the second conductive section 192 The width of the second conductive segment 192 is greater than the width of the third conductive segment 193, and the third conductive segment 193 is greater than the width of the first conductive segment 191. In one embodiment, as shown in FIG. 1, the length of the third conductive section 193 extending along the longitudinal direction D2 of the substrate 10 is greater than the length of the fourth conductive section 194 extending along the longitudinal direction D2 of the substrate 10. Since the fifth conductive segment 195, the sixth conductive segment 196, the seventh conductive segment 197, and the eighth conductive segment 198 are connected to each other and the width relationship is similar to the foregoing embodiment, it will not be repeated here.

In one embodiment, the first transmission line 19 extends along the longitudinal direction D2 of the substrate 10, and the radiating metal portions 11 and 13 and the other two radiating metal portions 12 and 14 are symmetrically arranged with the first transmission line 19 as a reference. On the other hand, the ground metal parts 15 and 17 and the other two ground metal parts 16 and 18 are symmetrically arranged with the first transmission line 19 as a reference. In one embodiment, as shown in FIG. 3, the projections of the radiating metal portions 11-14 in the direction perpendicular to the first surface S1 partially overlap the grounded metal portions 15-18, respectively.

In one embodiment, as shown in FIG. 1, the first transmission line 19 of the antenna 1 is connected to the radiating metal portions 11-14 through a plurality of connecting portions 20-23 of the signal transmission layer SL, respectively. In detail, each of the plurality of connecting portions 20 to 23 connects a corresponding one of the radiating metal portions to the first transmission line 19. For example, the connecting part 20 connects the radiating metal part 11 to the first transmission line 19, the connecting part 21 connects the radiating metal part 12 to the first transmission line 19, the connecting part 22 connects the radiating metal part 13 to the transmission line matching line 19, and the connecting part 23 The radiating metal part 14 is connected to the first transmission line 19.

Wherein, the first high frequency part of each radiating metal part is connected to the first connection point of the corresponding connection part, and the first low frequency part of each radiating metal part is connected to the second connection point of the corresponding connection part. For example, taking the radiating metal portion 11 as an example, the first high frequency portion 110 of the radiating metal portion 11 is connected to the first connection point C1 of the corresponding connecting portion 20, and the first low frequency portion 111 of the radiating metal portion 11 is connected to the corresponding The second connection point C2 of the connecting portion 20. The distance between the first connection point C1 and the first transmission line 19 is greater than the distance between the second connection point C2 and the first transmission line 19. In more detail, from the first connection point C1 along the short side direction D1 to the first transmission line 19 The distance is greater than the distance from the second connection point C2 to the first transmission line 19 along the short side direction D1. The connection mode of the remaining radiating metal parts and their corresponding connection parts is similar, and will not be repeated here.

Please refer to FIG. 4. FIG. 4 is a perspective schematic diagram of a dual-band symmetrical dipole array antenna according to an embodiment of the present invention. As shown in FIG. 4, in practice, the aforementioned antenna 1 may further include a first housing E1 and a second housing E2, where the first housing E1 and the second housing E2 are combined to form an accommodating space, and the substrate 10 and the signal transmission layer SL and the ground layer GL disposed on the two opposite surfaces S1 and S2 can be regarded as an antenna body, and are placed in the accommodating space formed by the first housing E1 and the second housing E2 to achieve Protect the antenna body from external damage.

Please refer to FIG. 5. FIG. 5 is a top view of a dual-band symmetrical dipole array antenna according to another embodiment of the present invention. As shown in the figure, the dual-band symmetrical dipole array antenna 3 (hereinafter referred to as "antenna 3") includes a substrate 30. The first surface S1' and the second surface S2' of the substrate 30 are respectively provided with a signal transmission layer and The ground layer (not marked in the figure), where the signal transmission layer includes four radiating metal portions 31, 33, 35, and 37 and the first transmission line 39, and the ground layer includes four ground metal portions 32, 34, 36, and 38, and the first transmission line 39. Second transmission line 39'. The first transmission line 39 and the second transmission line 39' form a transmission line matching network, and the radiating metal part 31 has a first high frequency part 310 and a first low frequency part 311. The radiating metal part 33 has a first high frequency part 330 and a first low frequency part 331. The radiating metal part 35 has a first high frequency part 350 and a first low frequency part 351. The radiating metal part 37 has a first high frequency part 370 and a first low frequency part 371. The ground metal part 32 has a second high frequency part 320 and a second low frequency part 321. The ground metal part 34 has a second high frequency part 340 and a second low frequency part 341. The ground metal part 36 has a second high frequency part 360 and a second low frequency part 361. The ground metal part 38 has a second high frequency part 380 and a second low frequency part 381.

In order to facilitate the description of the structural advantages of the antenna 1, the antenna 3 of FIG. 5 is taken as an example of an experimental control group. The following will analyze and compare the experimental data of the two antennas.

Please refer to FIG. 6. FIG. 6 is a diagram showing the relationship between return loss/peak gain and frequency of the antenna 1 and the antenna 3 according to an embodiment of the present invention. As shown in Figure 6, the curve Sim._RL_070 represents the return loss of the antenna 1, and the curve Sim._RL_960 Represents the return loss of the antenna 3. It can be seen from Figure 6 that, as a whole, the curve Sim._RL_070 is slightly lower than the curve Sim in the low frequency (2.4~2.5GHz) and high frequency (5.15~7.125Hz) range. _RL_960, so it can be verified that in the low frequency (2.4~2.5GHz) and high frequency (5.15~7.125Hz) range, the return loss of antenna 1 is better than that of antenna 3.

On the other hand, the curve Sim._PG_070 represents the peak gain of the antenna 1, and the curve Sim._PG_960 represents the peak gain of the antenna 3. It can be seen from Figure 6 that generally speaking, the curve Sim._PG_070 is not significantly different from the curve Sim._PG_960 in the low frequency (2.4~2.5GHz) range, but the curve Sim._PG_070 is in the high frequency (5.15~7.125Hz) range The middle is lower than the curve Sim._PG_960. Therefore, it can be verified that at high frequencies (5.15~7.125 Hz), compared to the peak gain of antenna 3, the peak gain of antenna 1 performs better, that is, the antenna gain can reach 3~6dBi.

Please refer to FIG. 7, which is a diagram of the relationship between the voltage standing wave ratio (VSWR) and frequency of the antenna 1 and the antenna 3 according to an embodiment of the present invention. As shown in Figure 7, the curve VR070 represents the voltage standing wave ratio of antenna 1, and the curve VR960 represents the voltage standing wave ratio of antenna 3. Generally speaking, the closer the voltage standing wave ratio is to 1, the better the impedance matching and the higher the transmission efficiency. It can be seen from FIG. 7 that, generally speaking, in the low frequency range (2.4-2.5 GHz), the performance of the voltage standing wave ratio of the antenna 1 is better than that of the antenna 3. The performance of the voltage standing wave ratio of the antenna 1 is better than the performance of the voltage standing wave ratio of the antenna 3 in the high frequency range (5.1~5.6GHz, 6.1~7.1GHz).

In order to verify that the dual-band symmetrical dipole array antenna proposed by the present invention conforms to the omnidirectional antenna design, the radiation pattern diagram of the antenna at high and low frequencies will be shown below. Please refer to FIG. 8, FIG. 9 and FIG. 10 together, where FIG. 8 is the radiation pattern of the dual-band symmetrical dipole array antenna on the H-plane from 2400MHz to 2500MHz according to an embodiment of the present invention. Figure 9 is a diagram of the radiation field pattern of a dual-band symmetrical dipole array antenna from 5100MHz to 5900MHz on the H-plane drawn according to an embodiment of the present invention. Figure 10 is based on an embodiment of the present invention. The illustrated dual-band symmetrical dipole array antenna is a radiation pattern diagram of the frequency band 6100MHz to 7100MHz on the H-plane.

Based on the simplicity of the diagram, the above-mentioned curves for each frequency band are only drawn for three frequencies, where the H-plane refers to the x-y plane. It can be seen from the above diagrams that the patterns of the radiation field patterns generated by different frequency bands are not completely the same, and the antenna proposed by the present invention is either a low frequency band (2400MHz~2500MHz) or a high frequency band (5100MHz~5900MHz and 6100MHz) ~7100MHz) can have good field patterns on different planes.

To sum up, the dual-band symmetrical dipole array antenna proposed by the present invention is mainly designed by adjusting the low-frequency antenna so that the multiplier has a larger bandwidth at high frequencies and using the coupling between low and high frequencies to design the frequency The wider dual-frequency dipole antenna further combines multiple dual-frequency dipole antennas with transmission line matching lines to form a symmetrical array structure, which can increase the antenna's working bandwidth while maintaining the original antenna size. Increase the gain of the antenna.

Although the present invention is disclosed in the foregoing embodiments as above, it is not intended to limit the present invention. Without departing from the spirit and scope of this new model, all changes and modifications made are within the scope of patent protection of this new model. For the scope of protection defined by this model, please refer to the attached scope of patent application.

1: Dual-band symmetrical dipole array antenna

10: substrate

11~14: Radiation Metal Department

110, 120, 130, 140: the first high frequency part

111, 121, 131, 141: the first low frequency part

15~18: Grounded metal part

150, 160, 170, 180: second high frequency part

151, 161, 171, 181: second low frequency part

19: The first transmission line

19’: The second transmission line

191~194: Conductive section

20~23: Connection part

S1: First surface

S2: second surface

D1: Short side direction

D2: Long side direction

SE1, SE2: short side

LE1, LE2: Long side

C1: The first connection point

C2: second connection point

DA1~DA4: Dual-frequency dipole antenna

Claims (8)

A dual-band symmetrical dipole array antenna, comprising: a substrate with a first surface and a second surface opposite to each other; a signal transmission layer disposed on the first surface, the signal transmission layer including a first transmission line and A plurality of radiating metal parts electrically connected to the first transmission line, each radiating metal part having a first high frequency part and a first low frequency part; and a ground layer disposed on the second surface, the ground layer including A second transmission line and a plurality of grounded metal parts electrically connected to the second transmission line, the orthographic projection of each grounded metal part on the first surface is symmetrical with a corresponding one of the radiating metal parts, and each A grounded metal part has a second high frequency part and a second low frequency part; wherein, the first transmission line and the second transmission line form a transmission line matching network, and the first transmission line has a signal feeding end extending to The second transmission line of the ground layer is electrically connected to the ground metal parts, and the first high frequency part of each radiating metal part and the second high frequency part of the symmetrical ground metal part form a high frequency antenna Unit, the first low frequency part of each radiating metal part and the second low frequency part of the symmetrical grounding metal part form a low frequency antenna unit. The dual-band symmetrical dipole array antenna according to claim 1, wherein the first transmission line extends along a long side direction of the substrate and includes a stepped structure in the long side direction. The dual-band symmetrical dipole array antenna according to claim 2, wherein the stepped structure includes a first conductive section, a second conductive section, a third conductive section and extending along the long side direction of the substrate A fourth conductive segment, and the first conductive segment, the second conductive segment, the third conductive segment, and the fourth conductive segment are electrically connected in sequence from the signal feeding end toward a short side of the substrate The first conductive segment, the second conductive segment, the third conductive segment, and the fourth conductive segment have different widths in a short-side direction of the substrate. The dual-band symmetrical dipole array antenna according to claim 3, wherein a length of the third conductive section along the long side of the substrate is greater than that of the fourth conductive section along the long side of the substrate A length of extension. The dual-band symmetrical dipole array antenna according to claim 1, wherein the first transmission line extends along a long side of the substrate, and the radiating metal portions are four radiating metal portions, and the four radiating metal portions The two radiating metal parts and the other two radiating metal parts in the part are symmetrically arranged based on the first transmission line. The dual-band symmetrical dipole array antenna according to claim 5, wherein the grounded metal parts are four grounded metal parts, two of the four grounded metal parts and the other two grounded metal parts It is symmetrically arranged based on the first transmission line. The dual-band symmetrical dipole array antenna according to claim 6, wherein the projection of each of the four radiating metal portions in a direction perpendicular to the first surface partially overlaps the four grounded metal portions Corresponding to a grounded metal part in. The dual-band symmetrical dipole array antenna according to claim 1, wherein the radiating metal parts are respectively connected to the first transmission line via a plurality of connection parts of the signal transmission layer, and the first transmission line of each radiating metal part A high frequency part is connected to a first connection point of the corresponding connection part, and the first low frequency part of each radiating metal part is connected to a second connection point of the corresponding connection part, the first The distance between the connection point and the first transmission line is greater than the distance between the second connection point and the first transmission line.

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