TWI685148B - Broadband open slot antenna structure - Google Patents

Abstract

An antenna structure is disclosed, which includes a substrate, a ground plate and a feeding structure. The substrate has a bottom portion and an extending side portion, in which the extending side portion is perpendicularly connected to the bottom portion. The ground plate is disposed on an outer surface of the substrate and includes an open slot that extends from the bottom portion of the substrate to the extending side portion of the substrate. The feeding structure is disposed on an inner surface of the substrate and includes first to three feeding sections. The first feeding section and the third feeding section are disposed at the bottom portion of the substrate and are partially overlapped with the open slot along the direction perpendicular to the major plane of the substrate. The second feeding section is at the extending side portion of the substrate and connects with the first feeding section.

Description

Broadband slotted antenna structure

The invention relates to an antenna structure, and in particular to an antenna structure suitable for present and future mobile communication devices and having a wide operating frequency band.

Recently, as the demand for wireless network transmission has kept pace with the times, the 5th generation (5G) mobile communication system has recently been proposed, and its information transmission speed is 100 times faster than the current fourth generation mobile communication system , Enabling mobile end users to download or upload data at a faster rate. In addition, the fifth-generation mobile communication system can be applied to, for example, the Internet of Things, self-driving cars, and other high-tech products that require ultra-high-speed communication, and it is expected that the fifth-generation mobile communication system network will be commercialized in the second half of 2019 .

According to the 3GPP technical standard specification TS 38.101, the frequency band used by the fifth-generation mobile communication system standard can be divided into a millimeter wave (millimeter wave; mmWave) frequency band and a Sub-6 GHz frequency band. In the Sub-6GHz frequency band, the frequency band below 3GHz is mainly used in today's mobile communication systems, such as the fourth generation mobile communication system, and the frequency band from 5GHz to 6GHz is mainly It is used for wireless local area network (WLAN), so the unused part of 3GHz to 5GHz (n77 to n79 frequency band) has been planned as a potential frequency band for 5G communication systems. On the other hand, in response to market orientation, most smartphone products have recently moved toward design specifications such as thinner, thinner screens, and high resolution. Therefore, how to develop a wide-band antenna structure that includes a wide-band frequency range and at the same time has good radiation efficiency has been one of the goals of those skilled in the relevant art.

An object of the present invention is to provide an antenna structure having an ultra-wideband operating frequency band including several frequency bands of a fifth-generation communication system and a wireless local area network frequency band, and having good return loss in the ultra-wideband operating frequency band. In particular, in the embodiment where the antenna structure has a multiple input multiple output array, it can also have good indexes such as reflection coefficient, transmission coefficient, antenna efficiency, and packet correlation coefficient.

According to the above objective, the present invention proposes an antenna structure, which includes a substrate, a ground plate, and a feeding structure. The base plate has a bottom and an extended side, wherein the extended side is connected to the bottom and extends from the bottom toward a direction perpendicular to the bottom. The ground plate is provided on the outer surface of the substrate and has a slotted hole extending from the bottom of the substrate to the extended side of the substrate. The feeding structure is disposed on the inner side of the substrate and includes the first to third feeding sections. The first feeding section is located at the bottom of the substrate and partially overlaps the slotted hole in a direction perpendicular to the main plane of the substrate. The second feed section is located on the extended side of the substrate and connected to the short of the first feed section Side. The third feeding section is located at the bottom of the substrate and connected to the long side of the first feeding section.

According to yet another embodiment of the present invention, the second feeding section is an L-shaped microstrip metal wire structure.

According to yet another embodiment of the present invention, the length direction of the portion of the slotted hole at the bottom of the substrate is substantially perpendicular to the length direction of the first feed section, and the portion of the slotted hole at the extended side of the substrate The length direction of is substantially parallel to the length direction of the second feeding section.

According to the above objective, the present invention further proposes an antenna structure, which includes a substrate, a ground plate, and a plurality of feeding structures. The substrate has a bottom and at least one extended side, wherein the extended side is connected to the bottom and extends from the bottom toward a direction perpendicular to the bottom. The ground plate is disposed on the outer side of the substrate, and has a plurality of slotted holes and extends from the bottom of the substrate to the extended side of the substrate. The feeding structure is disposed on the inner side of the substrate. The feed structures correspond to the slotted holes, and each feed structure includes first to third feed sections. The first feeding section is located at the bottom of the substrate and partially overlaps the slotted hole in a direction perpendicular to the main plane of the substrate. The second feeding section is located on the extended side of the substrate and connected to the short side of the first feeding section. The third feeding section is located at the bottom of the substrate and connected to the long side of the first feeding section.

According to an embodiment of the invention, each of these second feeding sections is an L-shaped microstrip metal wire structure.

According to yet another embodiment of the present invention, in each of these feeding structures, the length direction of the first feeding section is substantially perpendicular to the length direction of the portion of the slotted hole corresponding to the first feeding section at the bottom of the substrate And the second feed-in section The length direction of is substantially parallel to the length direction of the portion of the slotted hole corresponding to the second feed section on the corresponding extending side portion of the substrate.

According to yet another embodiment of the present invention, at least two of the feed structures correspond to the same at least one extended side portion and have a first structure pattern and a second structure pattern, respectively, wherein the first structure pattern and the second structure pattern It is mirror symmetrical.

According to another embodiment of the present invention, the at least one extension side portion is the first extension side portion and the second extension side portion opposite to each other. The number of feed structures corresponding to the first extension side portion in these feed structures is The number of feed structures corresponding to the second extension side is the same.

According to yet another embodiment of the present invention, the feed structures corresponding to the first extended side of these feed structures have a first structure pattern, and the feed structures corresponding to the second extended side of these feed structures have a second The structural pattern, wherein the first structural pattern and the second structural pattern are mirror-symmetrical.

100‧‧‧ Antenna structure

110‧‧‧ substrate

110A‧‧‧Bottom

110B~110E‧‧‧Extended side

120‧‧‧Ground plate

122A~122H‧‧‧Slotted hole

130A~130H‧‧‧Feeding structure

132A, 132D‧‧‧First feed section

134A, 134D‧‧‧Second feeding section

136A, 136D‧‧‧‧Feeding section

ANT1~ANT8‧‧‧Slotted antenna

H110‧‧‧ Height

L110, L122 ₁ , L122 ₂ , L122 ₃ , L122 ₄ , L122 ₅ , L132 ₁ , L132 ₂ , L134 ₁ , L134 ₂ , L136 ₁ , L136 ₂ ‧‧‧Length

W110‧‧‧Width

For a more complete understanding of the embodiment and its advantages, reference is now made to the following description made in conjunction with the accompanying drawings, where: [FIG. 1] is a perspective schematic view of an antenna structure according to an embodiment of the invention; [FIG. 2A] is [FIG. 1] [Figure 2B] is a plan view of the inside of the slotted antenna of [Figure 1]; [Figure 2C] is a plan view of the outside of the slotted antenna of [Figure 1]; [Figure 2B] 3] is a perspective perspective view of another slotted antenna of [Figure 1]; [FIG. 4] Examples of different parameters of the second feed section of the slotted antenna and corresponding simulation results of the relationship between operating frequency and return loss; [FIG. 5] of the third feed section of the slotted antenna Examples of different parameters and corresponding simulation results of the relationship between operating frequency and return loss; [Figure 6A] is the simulation result of the relationship between the reflection coefficient of the slotted antenna and the operating frequency; [Figure 6B] is the transmission coefficient of the slotted antenna Simulation results of the relationship with the operating frequency; [Figure 7] is the simulation results of the relationship between the antenna efficiency of the slotted antenna and the operating frequency; and [Figure 8] is the simulation results of the relationship between the packet correlation coefficient of the slotted antenna and the operating frequency.

The embodiments of the present invention are discussed in detail below. However, it can be understood that the embodiments provide many applicable concepts that can be implemented in a variety of specific contents. The discussed and disclosed embodiments are for illustration only and are not intended to limit the scope of the present invention.

FIG. 1 is a schematic perspective view of an antenna structure 100 according to an embodiment of the invention. The antenna structure 100 may be installed in a mobile communication device, such as a smart phone, tablet computer, or notebook computer, but is not limited thereto. In particular, the antenna structure 100 can be integrated with the casing (eg, back cover) of the mobile communication device. The antenna structure 100 includes a substrate 110, a ground plate 120 on the substrate 110, and a plurality of multiple inputs arranged as multiple inputs multiple output; MIMO) array feeding structure 130A~130H. The substrate 110 serves as a system circuit board of the antenna structure 100, and in addition to the ground plate 120 and the plurality of feeding structures 130A to 130H, other elements such as metal traces and the like can be provided on the substrate 110.

The substrate 110 may be a glass fiber substrate, a ceramic substrate, or other similar substrates. In addition, as shown in FIG. 1, the substrate 110 includes a bottom 110A and extended side portions 110B to 110E extending vertically upward from the four sides of the bottom 110A, respectively, wherein the extended side portions 110B and 110C are respectively located at two relatively long sides of the bottom 110A And the extended side portions 110D and 110E are respectively located on two relatively short sides of the bottom portion 110A. The bottom portion 110A and the extension side portions 110B~110E may be an integrally formed structure, and the extension side portions 110B~110E form a three-dimensional frame-shaped side wall. In this embodiment, the heights of the extension side portions 110B~110E are the same, and the thickness of the bottom portion 110A and the extension side portions 110B~110E are the same. In other embodiments, the extension side portions 110B~110E may have different heights, for example, the height of the extension side portions 110B, 110C may be different from the height of the extension side portions 110D, 110E.

The ground plate 120 serves as the system ground plane of the antenna structure 100, and its material may be metal such as copper, silver, gold, or the like. The ground plate 120 is disposed on the outer surface of the substrate 110 and extends from the bottom 110A of the substrate 110 to the extended side portions 110B to 110E of the substrate 110. In other words, the ground plate 120 is located outside the bottom of the bottom frame 110A of the substrate 110 and the three-dimensional frame-shaped side wall formed by the extension side portions 110B to 110E. The ground plate 120 has a plurality of slotted holes 122A-122H, and each slotted hole 122A-122H extends from the bottom 110A of the substrate 110 to the corresponding extended side portion 122B-122E. As shown in Figure 1, open The slots 122A-122D extend from the bottom 110A of the substrate 110 to the extended side 110B, and the slotted holes 122E-122H extend from the bottom 110A of the substrate 110 to the extended side 110C. Since the antenna structure 100 has slotted holes 122A-122H, the antenna structure 100 may also be referred to as a slotted antenna structure.

The feed structures 130A-130H are disposed on the inner surface of the substrate 110 and extend from the bottom 110A of the substrate 110 to the corresponding extension sides 110B-110E of the substrate 110, wherein the feed structures 130A-130D extend to the substrate 110 The side portion 110B, and the feeding structures 130E to 130H extend to the extended side portion 110C of the substrate 110. That is to say, the feeding structures 130A to 130H are located on the inner side of the three-dimensional frame-shaped side wall formed by the top side of the bottom 110A of the substrate 110 and the extended side portions 110B to 110E.

In the antenna structure 100, the feeding structures 130A to 130H and the corresponding slotted holes 122A to 122H and the substrate 110 and the ground plate 120 form slotted antennas ANT1 to ANT8, of which the slotted antennas ANT1 to ANT4 and the substrate 110 One side forms a sub-array, and the slotted antennas ANT5~ANT8 and the opposite side of the substrate 110 form a sub-array.

2A is a perspective perspective view of the slotted antenna ANT1 of FIG. 1, and FIGS. 2B and 2C are an inside plan view and an outside plan view of the slotted antenna ANT1 of FIG. 1, respectively. As shown in FIGS. 2A to 2C, in the slotted antenna ANT1, the feeding structure 130A includes a first feeding section 132A, a second feeding section 134A, and a third feeding section 136A. The first feeding section 132A and the third feeding section 136A are both located at the bottom 110A of the substrate 110, and both partially overlap the slotted hole 122A in a direction perpendicular to the main plane of the substrate 110 (ie, direction Z). In some embodiments, the first feed section 132A has an impedance equal to 50 ohms Microstrip metal wire. The second feeding section 134A is located on the extended side 110B of the substrate 110 and is connected to the short side of the first feeding section 132A. In other words, the second feeding section 134A extends from the end of the first feeding section 132A to excite the slotted hole 122A. The third feeding section 136A is connected to the long side of the first feeding section 132A, which is used to adjust the impedance matching of the feeding structure 130A in the high frequency band, and enables the slotted antenna ANT1 to have an ultra-wide frequency operating band.

In FIG. 2A, the length direction of the portion of the slotted hole 122A at the bottom 110A of the substrate 110 is approximately perpendicular to the length direction of the first feeding section 132A, and the length of the portion of the slotted hole 122A at the extended side 110B of the substrate 110 The direction is substantially parallel to the length direction of the second feeding section 134A. In addition, in some embodiments, the second feeding section 134A is an L-shaped microstrip metal wire structure.

The structural pattern of each of the part of the feeding structures 130A-130H may be mirror-symmetric with the structural pattern of each of the other part of the feeding structures. For example, if the structure patterns of the feeding structures 130A and 130D are mirror-symmetrical, the perspective perspective view of the slotted antenna ANT4 of FIG. 1 is shown in FIG. 3. In the slotted antenna ANT4, the feeding structure 130D includes a first feeding section 132D, a second feeding section 134D, and a third feeding section 136D. The roles of the first feeding section 132D, the second feeding section 134D, and the third feeding section 136D in the slotted antenna ANT4 are different from those of the first feeding section 132A, the second feeding section 134A, and the The third feeding section 136A has the same function in the slotted antenna ANT1. In addition, the structural patterns of the slotted holes 122A and 122D are also mirror-symmetrical, and the role of the slotted hole 122D in the slotted antenna ANT4 is the same as that of the slotted hole 122A in the slotted antenna ANT1 use. Therefore, the structural patterns of the slotted antennas ANT1 and ANT4 are also mirror-symmetrical. In other embodiments, the structure patterns of the feeding structures 130A-130H may be the same.

In the embodiment of the present invention, the structure patterns of the slotted antennas ANT1 and ANT2 are the same, the structure patterns of the slotted antennas ANT3 and ANT4 are the same, and the pattern of each slotted antenna ANT1 and ANT2 is the same as that of each slotted antenna The structure pattern of ANT3 and ANT4 is mirror image symmetry. In addition, the structural pattern composed of slotted antennas ANT1~ANT4 and the structural pattern composed of slotted antennas ANT5~ANT8 are also mirror-symmetrical. Therefore, the slotted antennas ANT1, ANT2, ANT7, and ANT8 have the same structure pattern (as shown in FIG. 2A), and the slotted antennas ANT3~ANT6 have the same structure pattern (as shown in FIG. 3).

6.2毫米。其他開槽孔天線ANT2~ANT8中各元件的各個長度均分別與開槽孔天線ANT1中各元件的各個長度相同。然而，應注意的是，上述各元件的長度、寬度和厚度等物理性質可依據應用及設計需求而對應調整，並不以上述為限。 In the following description, the physical properties of each element in the antenna structure 100 of the embodiment of the present invention are as follows. The substrate 110 is a glass fiber substrate (FR4 substrate) with a relative permittivity of 4.4 and a loss tangent of 0.02, and its length L110, width W110, and height H110 are 75 mm, 150 mm, and 7 mm, respectively. . In the substrate 110, the thickness of the bottom portion 110A and each of the extended side portions 110B~110E are 0.8 mm. On the side of the extension side 110B, the distance between the slotted antenna ANT1 and the extension side 110D is 21 mm, the distance between the slotted antennas ANT1 and ANT2 is 19 mm, and the distance between the slotted antennas ANT2 and ANT3 The distance is 34 mm, the distance between the slotted antennas ANT3 and ANT4 is 19 mm, and the distance between the slotted antenna ANT4 and the extended side 110E is 21 mm. In the slotted antenna ANT1 shown in FIG. 2A, the lengths L122 ₁ , L122 ₂ , L122 ₃ , L122 ₄ , and L122 _{5 of the} slotted hole 122A are 9 mm, 1.5 mm, 2 mm, 7 mm, and 2 mm, respectively. a first feeding section 132A of the length L132 _1, L132 ₂ are 15 mm, 1.5 mm and a length of the second feeding section 134A L134 _1, L134 ₂ mm respectively, and t 1.5 mm, and the third feeding section 136A of The lengths L136 ₁ and L136 ₂ are S mm and 1 mm, respectively. If the end of the second feed section 134A has horizontally extending branches, as shown in FIGS. 2A and 2B, the length L134 ₁ of the second feed section 134A is t=7.7+t1 mm, where t1 is the second feed The length of the branch of segment 134A extending in the horizontal direction. Conversely, if the end of the second feed section 134A does not have a branch extending horizontally, the length L134 ₁ of the second feed section 134A is t

6.2 mm. The lengths of the elements in the other slotted antennas ANT2 to ANT8 are the same as the lengths of the elements in the slotted antenna ANT1. However, it should be noted that the physical properties such as the length, width, and thickness of the above components can be adjusted according to application and design requirements, and are not limited to the above.

4 is a simulation result of an embodiment of a different parameter t of the second feeding section 134A in the slotted antenna ANT1 and the corresponding operation frequency and return loss. In the embodiment of the different parameter t of each second feed section 134A of FIG. 4, the parameter S of the third feed section 136A is 3.5. It can be seen from FIG. 4 that in the embodiment with the parameter t=0, the return loss corresponding to each frequency is below 3dB, so the operating mode of the slotted hole 122 cannot be effectively excited; in the embodiment with the parameter t=4.2 , The slotted antenna ANT1 has two operating modes (corresponding to a return loss of more than 10dB), which are the first mode of 3.3GHz to 4GHz and the second mode of 6.3GHz to 7GHz; the implementation of the parameter t = 6.2 example In the first mode and the second mode are combined into a broadband mode, the bandwidth is about 3.2GHz to 6GHz, covering the n77-n79 band (3.3GHz to 5GHz) of the fifth generation communication system and the wireless LAN 5-GHz frequency band (5.15GHz to 5.875GHz); in the embodiment with the parameter t=8.2 (that is, the parameter t1=0.5), the bandwidth of the broadband mode is almost the same as the embodiment with the parameter t=6.2, but Most of the frequencies in the bandwidth of the broadband mode have a lower return loss; in the embodiment with the parameter t=9.7 (that is, the parameter t1=2), the bandwidth of the broadband mode is significantly smaller than the implementation of the parameter t=8.2 Example wide-band modal bandwidth.

FIG. 5 is a simulation result of the relationship between the operating frequency and the return loss of the embodiment of the parameter S of the third feed section 136A in the slotted antenna ANT1. In the embodiments of the different parameters S of the third feed section 136A of FIG. 5, the parameter t of the second feed section 134A is 8.2. It can be seen from FIG. 5 that in the embodiment with length S=0 (ie, the embodiment without the third feed section 136A), the slotted antenna ANT1 has only a single operating mode of 3.29 GHz to 5.14 GHz; parameters The simulation result of the embodiment with S=3.5 is the same as that of the embodiment with the parameter t=8.2 in FIG. 4; in the embodiment with the parameter S=5, the bandwidth of the wideband mode is longer than that of the embodiment with the length S=3.5 The bandwidth is large, but the return loss in the frequency band from 3.5GHz to 5.25GHz is lower than that in the embodiment with the parameter S=3.5; in the embodiment with the parameter S=7, the slotted antenna ANT1 has the first mode and the second Modal, but the first and second modes are in discontinuous operating bands.

4 and 5 show only the simulation results of the return loss of the slotted antenna ANT1. In the embodiment in which the structure patterns of the slotted antennas ANT2 to ANT8 are the same as the slotted antennas ANT1 or are mirror images of each other, The slot antennas ANT2~ANT8 can have similar simulation results as the slot antenna ANT1, and will not be repeated here.

In the following simulations, the parameter S of the third feed section 136A is 3.5 and the parameter t of the second feed section 134A is 8.2. 6A and 6B are the simulation results of the relationship between the operating frequency and reflection coefficient and the relationship between the operating frequency and the transmission coefficient corresponding to the slotted antennas ANT1~ANT4, respectively. As can be seen from FIGS. 6A and 6B, in the frequency range of 3.3 GHz to 5.875 GHz (including the n77-n79 frequency band of the fifth-generation communication system and the 5-GHz frequency band of the wireless local area network), the slotted antennas ANT1~ANT4 The reflection coefficients S ₁₁ , S ₂₂ , S ₃₃ , S _{44 are} all less than -10dB, and the transmission coefficient S ₂₁ between the slotted antennas ANT1, ANT2, the transmission coefficient S ₃₁ between the slotted antennas ANT1, ANT3, open The transmission coefficient S ₃₂ between the slot antennas ANT2 and ANT3, the transmission coefficient S ₄₂ between the slot antennas ANT2 and ANT4, and the transmission coefficient S ₄₃ between the slot antennas ANT3 and ANT4 are all less than -10dB. Therefore, the slotted antennas ANT1~ANT4 not only have good operating bandwidth performance, but also have good isolation performance.

7 is a simulation result of the relationship between the operating frequency corresponding to the slotted antennas ANT1~ANT4 and the antenna efficiency. The simulation results in Figure 7 have incorporated the factors of impedance mismatch. As can be seen from FIG. 7, in the frequency range of 3.3 GHz to 5.875 GHz, the antenna efficiency of the slotted antennas ANT1 to ANT4 are all greater than 60%, and the antenna efficiency of the slotted antennas ANT1 and ANT4 are further greater than 70%. It can be seen from the above that the slotted antennas ANT1~ANT4 also have good antenna efficiency.

8 is a simulation result of the relationship between the operating frequency corresponding to the slotted antennas ANT1~ANT4 and the envelope correlation coefficient (ECC). As can be seen from FIG. 8, the correlation coefficient of the packet between the slotted antennas ANT1, ANT2, the correlation coefficient of the packet between the slotted antennas ANT2, ANT3, and the correlation coefficient of the packet between the slotted antennas ANT3, ANT4 range from 3.3 GHz to 5. The frequency range of 5.875GHz is lower than 0.1, which meets the industry requirements for the multi-input multi-output antenna packet correlation coefficient to be less than 0.5.

It should be noted that FIGS. 6A to 8 only show the simulation results of the slotted antennas ANT1 to ANT4. In the embodiment where the antenna structure is a line-symmetric structure, since the structure patterns of the slotted antennas ANT5~ANT8 are mirror images of the structure patterns of the slotted antennas ANT1~ANT4, respectively, the slotted antennas ANT5~ANT8 can have The simulation results of slot antennas ANT1~ANT4 are similar and will not be repeated here.

In summary, the antenna structure of the present invention has an ultra-wideband operating band including the n77-n79 band of the fifth-generation communication system and the 5-GHZ band of the wireless local area network, and has a good return in this ultra-wideband operating band loss. In particular, in the embodiment where the antenna structure has a multiple input multiple output array, it can also have good indexes such as reflection coefficient, transmission coefficient, antenna efficiency, and packet correlation coefficient.

Although the present invention has been disclosed as above with examples, it is not intended to limit the present invention. Any person with ordinary knowledge in the technical field can make some changes and modifications without departing from the spirit and scope of the present invention. The scope of protection of the present invention shall be subject to the scope defined in the appended patent application.

110‧‧‧ substrate

110A‧‧‧Bottom

110B‧‧‧Extended side

120‧‧‧Ground plate

122A‧‧‧Slotted hole

130A‧‧‧Feeding structure

132A‧‧‧First feeding section

134A‧‧‧Second feeding section

136A‧‧‧third feed section

ANT1‧‧‧Slotted antenna

L122 ₁ , L122 ₂ , L122 ₃ , L122 ₄ , L122 ₅ , L132 ₁ , L132 ₂ , L134 ₁ , L134 ₂ , L136 ₁ , L136 ₂ ‧‧‧ Length

Claims (9)

An antenna structure includes: a substrate with a bottom and an extended side, wherein the extended side is connected to the bottom and extends from the bottom toward a direction perpendicular to the bottom; a ground plate is provided on an outer side of the substrate The ground plate has a slotted hole extending from the bottom of the substrate to the extended side of the substrate; and a feeding structure is provided on an inner surface of the substrate, the feeding structure includes : A first feeding section located at the bottom of the substrate, the first feeding section partially overlaps the slotted hole in a direction perpendicular to the main plane of the substrate, and the first feeding section has a short side And a long side, wherein the short side is located at the junction of the bottom of the substrate and the extended side, and the long side is perpendicular to the short side; a second feed section is located on the substrate Extending the side and connected to a short side of the first feed section; and a third feed section, located at the bottom of the substrate and connected to a long side of the first feed section, the third feed The entry section partially overlaps the slotted hole in a direction perpendicular to the main plane of the substrate. The antenna structure as described in item 1 of the patent application scope, wherein the second feeding section is an L-shaped microstrip metal wire structure. The antenna structure as described in item 1 of the patent application scope, wherein the length direction of the portion of the slotted hole at the bottom of the substrate is approximately The length direction of the first feeding section is perpendicular, and the length direction of the portion of the slotted hole at the extending side of the substrate is substantially parallel to the length direction of the second feeding section. An antenna structure includes: a substrate having a bottom and at least one extended side, wherein the at least one extended side is connected to the bottom and extends from the bottom toward a direction perpendicular to the bottom; a ground plate is provided on the substrate On an outer surface, the ground plate has a plurality of slotted holes, each of the slotted holes extends from the bottom of the substrate to at least one extended side of the substrate; and a plurality of feeding structures are provided on the substrate On an inner side, the feed structures correspond to the slotted holes, and each of the feed structures includes: a first feed section located at the bottom of the substrate, the first feed section is located vertically The main plane of the substrate partially overlaps the corresponding slotted hole in the direction, and the first feeding section has a short side and a long side, wherein the short side is located at the bottom of the substrate and the at least one The junction of one of the extended sides, and the long side is perpendicular to the short side; and a second feed section located on the extended side of the substrate and connected to a short of the first feed section Side; and a third feed section, located at the bottom of the substrate and connected to a long side of the first feed section, the third feed section in the direction perpendicular to the main plane of the substrate and the One of the slotted holes partially overlaps. The antenna structure as described in item 4 of the patent application scope, wherein each of the second feeding sections is an L-shaped microstrip metal wire structure. The antenna structure as described in item 4 of the patent application scope, wherein in each of the feed structures, the length of the first feed section corresponds roughly to the slot of the first feed section on the substrate The length direction of the bottom portion is perpendicular, and the length direction of the second feeding section is substantially parallel to the length direction of the corresponding extending side portion of the slotted hole corresponding to the second feeding section on the substrate. The antenna structure as described in item 4 of the patent application scope, wherein at least two of the feed structures correspond to the same one of at least one extended side and have a first structure pattern and a second structure pattern, respectively, the first A structure pattern is mirror-symmetric to the second structure pattern. The antenna structure as described in item 4 of the patent application scope, wherein the at least one extension side portion is a first extension side portion and a second extension side portion opposite to each other, and the feed structures correspond to the first extension side portion The number of feed structures is the same as the number of feed structures corresponding to the second extension side. The antenna structure as described in item 8 of the patent application scope, wherein the feed structures corresponding to the first extended side of the feed structures have a first structure pattern, and the feed structures correspond to the second extended side Ministry of The feeding structure has a second structure pattern, and the first structure pattern and the second structure pattern are mirror-symmetrical.

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