Reflector structure and antenna device

Abstract

A reflector structure and an antenna device. The reflector structure is used to connect to an antenna, the antenna has an excitation source, and the reflector structure includes a metal substrate, at least one first flat plate and a second flat plate, wherein the metal substrate is used to reflect the radiation of the antenna, and the center of the metal substrate has a virtual normal; at least one first flat plate is arranged relative to the metal substrate and connected to the metal substrate. The second flat plate is floated on the metal substrate along the virtual normal and is completely separated from the at least one first flat plate to form a closed slot; the metal substrate, at least one first flat plate and the second flat plate form a cavity, and the cavity is connected to the closed slot; the closed slot is located on a plane, the excitation source is projected onto the plane to form an excitation source area, and the excitation source area is located in the closed slot. In this way, the present invention can reduce the overall height.

Description

Technical Field

[0001] The present invention relates to a reflection plate structure and an antenna device, and in particular to a reflection plate structure and an antenna device with closed slots and cavities. Background Art

[0002] In recent years, wireless networks have become more and more developed and popular. Whether in public places, educational places or homes, wireless networks are almost everywhere. With the advent of the era of the fifth generation mobile communication technology (5th Generation Mobile Networks, 5G), the demand for high-gain antennas is increasing. In order to improve the antenna gain, the conventional technology uses additional structures to increase the reflection efficiency of the antenna, but it also increases the overall volume of the antenna and causes inconvenience in assembly.

[0003] Due to the limitation of antenna physical size, antennas often need a certain amount of space to achieve high gain characteristics. As existing products are moving towards miniaturization, end customers hope to further reduce the size of antennas.

[0004] In view of this, in view of the problems existing in the above-mentioned antennas, how to reduce the height and overall volume of the antenna while maintaining good antenna performance is what the public is eagerly looking forward to, and it is also the goal and direction that related industries must work hard to develop breakthroughs.

[0005] Therefore, it is necessary to provide a reflector structure and an antenna device to solve the above problems. Summary of the invention

[0006] Therefore, the present invention provides a new reflector structure to replace the traditional reflector, and the antenna structure overlapped on the new reflector structure can reduce the height and volume of the entire antenna device, and at the same time make the antenna device have high gain characteristics.

[0007] According to one embodiment of the structural aspect of the present invention, a reflector structure is provided, which is used to reflect the radiation of an antenna, the antenna has an excitation source, and the reflector structure includes a metal substrate, at least one first flat plate and a second flat plate, wherein the metal substrate is used to reflect the radiation of the antenna, and the center of the metal substrate has a virtual normal. The at least one first flat plate is arranged relative to the metal substrate and connected to the metal substrate. The second flat plate is floated on the metal substrate along the virtual normal and is completely separated from the at least one first flat plate to form a closed slot. The metal substrate, the at least one first flat plate and the second flat plate form a cavity, and the cavity is connected to the closed slot, the closed slot is located above the cavity, wherein the closed slot is located on a plane, the excitation source is projected onto the plane to form an excitation source area, and the excitation source area is located in the closed slot.

[0008] Therefore, the reflector structure of the present invention can be applied to the metal reflector of the antenna device, and the antenna radiation path can be changed through the closed slots and cavities, thereby improving the antenna gain.

[0009] According to an embodiment of another structural aspect of the present invention, an antenna device is provided, which includes an antenna structure and a reflector structure, wherein the antenna structure has at least one excitation source. The reflector structure is used to reflect the radiation of the antenna structure, and the reflector structure includes a metal substrate, at least one first plate and a second plate, wherein the metal substrate has a virtual normal. The at least one first plate is arranged relative to the metal substrate and connected to the metal substrate. The second plate is floated on the metal substrate along the virtual normal and is completely separated from the at least one first plate to form a closed slot. The metal substrate, the at least one first plate and the second plate form a cavity, and the cavity is connected to the closed slot, and the closed slot is located above the cavity, wherein the closed slot is located on a plane, and the at least one excitation source is projected onto the plane to form an excitation source area, and the excitation source area is located in the closed slot.

[0010] Thus, the antenna device of the present invention utilizes the reflector structure and changes the path of the radiation emitted from the excitation source through the closed slots and cavities of the reflector structure, thereby maintaining good impedance matching and high gain radiation characteristics of the antenna. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 A three-dimensional schematic diagram of a reflector structure of a first embodiment of an aspect of the present invention;

[0012] Figure 2 for Figure 1 An exploded schematic diagram of a reflector structure;

[0013] Figure 3 A three-dimensional schematic diagram of a reflector structure according to a second embodiment of the present invention;

[0014] Figure 4 for Figure 3 An exploded schematic diagram of a reflector structure;

[0015] Figure 5 is a three-dimensional schematic diagram of an antenna device according to a third embodiment of another aspect of the present invention;

[0016] Figure 6 for Figure 5 An exploded schematic diagram of an antenna device;

[0017] Figure 7 is a three-dimensional schematic diagram of an antenna device according to a fourth embodiment of another aspect of the present invention;

[0018] Figure 8 for Figure 5 A schematic top view of an antenna device;

[0019] Fig. 9 for Figure 5 A schematic diagram of measuring the peak gain of the antenna structure corresponding to different first widths and second widths;

[0020] Fig.10 for Figure 5 Schematic diagram of the measurement of S11 parameters at different heights corresponding to the antenna structure;

[0021] Fig.11 for Figure 5 Schematic diagram of the measurement of peak gain of the antenna structure corresponding to different reflectors and distances;

[0022] Fig.12 for Figure 5 Schematic diagram of the measurement of S11 parameters corresponding to different reflectors and distances of the antenna structure;

[0023] Fig.13A for Figure 5 The Smith chart of antenna structure corresponding to different reflectors and distances; and

[0024] Fig. 13B for Figure 5 Another Smith chart of the antenna structure corresponding to different reflectors and distances.

[0025] Description of main component symbols:

[0026] 100, 200, 500, 500a Reflector structure

[0027] 110, 210, 510 First Plate

[0028] 120, 220, 520 Second plate

[0029] 130, 230, 530 metal substrate

[0030] 231, 531 substrate

[0031] 232, 532 metal layer

[0032] 233, 533 metal ring

[0033] 140, 240, 540 Closed slots

[0034] 150, 250, 550 Support

[0035] 160, 260, 560 cavity

[0036] 270, 570 slots

[0037] 300, 300a Antenna device

[0038] 400, 400a antenna structure

[0039] 410, 410a first antenna element

[0040] 420, 420a second antenna element

[0041] 411, 421, 411a, 421a Excitation source

[0042] 4101, 4201, 4101a, 4201a first radiation element

[0043] 4102, 4202, 4102a, 4202a second radiation element

[0044] 430, 430a Antenna substrate

[0045] 431, 431a first surface

[0046] 432, 432a second surface

[0047] 600, 600a support column

[0048] L, l virtual normal

[0049] W1 First Width

[0050] W2 Second width

[0051] H Height

[0052] D Distance

[0053] F Feeding terminal

[0054] G Ground terminal DETAILED DESCRIPTION

[0055] The following will describe multiple embodiments of the present invention with reference to the accompanying drawings. For the purpose of clarity, many practical details will be described together in the following description. However, it should be understood that these practical details should not be used to limit the present invention. That is, in some embodiments of the present invention, these practical details are not necessary. In addition, in order to simplify the drawings, some well-known and commonly used structures and elements will be depicted in a simple schematic manner in the drawings; and repeated elements may be represented by the same number.

[0056] In addition, herein, when a certain element (or mechanism or module, etc.) is "connected", "set" or "coupled" to another element, it may refer to that the element is directly connected, directly set or directly coupled to another element, or it may refer to that a certain element is indirectly connected, indirectly set or indirectly coupled to another element, that is, there are other elements between the element and the other element. When it is clearly stated that a certain element is "directly connected", "directly set" or "directly coupled" to another element, it means that there are no other elements between the element and the other element. The terms "first", "second", "third" and the like are only used to describe different elements or components, and there is no restriction on the elements / components themselves. Therefore, the first element / component may also be renamed as the second element / component. Moreover, the combination of elements / components / mechanisms / modules herein is not a generally known, conventional or well-known combination in this field, and it cannot be determined whether the combination relationship is easily completed by ordinary technicians in the technical field based on whether the elements / components / mechanisms / modules themselves are well-known.

[0057] Please also read Figure 1 and Figure 2 ,in Figure 1 FIG. 1 is a perspective schematic diagram of a reflector structure 100 according to a first embodiment of an aspect of the present invention. Figure 2 for Figure 1 Schematic diagram of an exploded view of a reflector structure 100. The reflector structure 100 is connected to an antenna (not shown separately) and is used to reflect radiation from the antenna, wherein the antenna has an excitation source (not shown separately).

[0058] Depend on Figure 1 and Figure 2 It can be seen that the reflector structure 100 includes at least one first plate 110, a second plate 120 and a metal substrate 130. The metal substrate 130 is mainly used to reflect the radiation emitted by the antenna, and the center of the metal substrate 130 has a virtual normal line L. At least one first plate 110 is relatively disposed on the metal substrate 130 and connected to the metal substrate 130. The second plate 120 is floated on the metal substrate 130 along the virtual normal line L, and is completely separated from the at least one first plate 110 to form a closed slot 140. Specifically, the reflector structure 100 may further include a support member 150, which is disposed between the second plate 120 and the metal substrate 130, and supports and abuts the second plate 120.

[0059] In particular, at least one first plate 110, a second plate 120 and a metal substrate 130 form a cavity 160, and the cavity 160 is connected to the closed slot 140. The closed slot 140 is located on a plane (not shown separately), and the excitation source is projected onto the plane to form an excitation source area (i.e., the position of the excitation source on the plane where the closed slot 140 is located), and the excitation source area is located in the closed slot 140. Thus, the reflector structure 100 of the present invention can be applied to the metal reflector of the antenna, and the path of the antenna radiation can be changed through the closed slot 140 and the cavity 160, thereby improving the antenna gain. It is also worth mentioning that Figure 1 The closed slot 140 is rectangular, and may also be circular or polygonal, but the present invention is not limited thereto.

[0060] Please also read Figure 3 and Figure 4 ,in Figure 3 FIG. 2 is a perspective schematic diagram of a reflector structure 200 according to a second embodiment of the present invention. Figure 4 for Figure 3 The decomposition diagram of the reflector structure 200 is shown in FIG. Figure 3 and Figure 4 As shown, the number of at least one first plate 210 can be multiple. The metal substrate 230 can include a substrate 231, a metal layer 232 and a metal ring 233, wherein the substrate 231 has a surface (not separately labeled), and the metal layer 232 is disposed on the surface, and the metal layer 232 is used to reflect the radiation emitted by the antenna. One end of the metal ring 233 is disposed on the outer periphery of the metal layer 232, and the other end of the metal ring 233 is connected to each first plate 210. It is worth noting that the metal ring 233 and each first plate 210 can be disposed separately from each other or formed integrally, and the metal layer 232, the metal ring 233, each first plate 210 and the second plate 220 form a cavity 260.

[0061] In detail, the substrate 231 and the metal layer 232 can also be considered as an integrally formed body, and the thickness (not separately labeled) of the substrate 231 and the metal layer 232 is only about a few millimeters, so as to minimize the volume of the reflector structure 200, and thus be applied to current network communication products. In addition, the cavity 260 is located between the metal layer 232 and the first plate 210, and is formed by the space covered by the metal ring 233; in other words, Figure 3 The cavity 260 of the second embodiment is Figure 2The cavity 160 of the first embodiment is the same. In addition, the reflective plate structure 200 may further include a support member 250, which is connected between the second plate 220 and the metal layer 232, and supports and abuts the second plate 220, wherein the height of the support member 250 is the same as the height of the metal ring 233, so that the second plate 220 can be located on the same horizontal plane as each first plate 210. Furthermore, each first plate 210 is arranged at intervals from each other along the other end of the metal ring 233. There may be a slot 270 between every two first plates 210, and each slot 270 is respectively connected to the closed slot 240, and the cavity 260 is connected to the closed slot 240 and all the slots 270. Figure 3 As shown in the second embodiment, the closed slot 240 and each slot 270 can be connected to each other in a tic-tac-toe shape, and the closed slot 240 and each slot 270 have the same width. However, in other embodiments, the width of the closed slot 240 and each slot 270 may also be different, so the present invention is not limited to this embodiment.

[0062] Thus, the reflector structure 200 of the present invention can be applied to the metal reflector of the antenna, and the radiation path of the antenna can be extended through the closed slot 240, each slot 270 and the cavity 260 to achieve high gain characteristics.

[0063] Please also read Figure 5 and Figure 6 ,in Figure 5 FIG. 1 is a schematic three-dimensional diagram of an antenna device 300 according to a third embodiment of another aspect of the present invention. Figure 6 for Figure 5 The exploded schematic diagram of the antenna device 300 is shown in FIG. Figure 5 and Figure 6 It can be seen that the antenna device 300 includes an antenna structure 400 and a reflector structure 500, wherein the reflector structure 500 is used to reflect the radiation emitted by the antenna structure 400. Specifically, the antenna structure 400 may include a first antenna element 410, a second antenna element 420 and an antenna substrate 430, wherein the antenna substrate 430 has a first surface 431 and a second surface 432 opposite to the first surface 431. The first antenna element 410 is disposed on the first surface 431, and the second antenna element 420 is disposed on the second surface 432.

[0064] In detail, the antenna structure 400 has two excitation sources 411 and 421, and each of the excitation sources 411 and 421 includes a feed end F and a ground end G. The first antenna element 410 can be a dipole antenna, which includes a first radiating element 4101 and a second radiating element 4102. The feed end F is connected to the first radiating element 4101, and the ground end G is connected to the second radiating element 4102. The second antenna element 420 can also be another dipole antenna, which includes a first radiating element 4201 and a second radiating element 4202. The feed end F is connected to the first radiating element 4201, and the ground end G is connected to the second radiating element 4202. In addition, as Figure 5 As shown, the first antenna element 410 and the second antenna element 420 are a dual-polarization dipole antenna. Dual-polarization means that the polarization directions of the first antenna element 410 and the second antenna element 420 are orthogonal to each other.

[0065] In more detail, the reflector structure 500 is vertically disposed on the antenna structure 400, and the reflector structure 500 includes at least one first plate 510, a second plate 520 and a metal substrate 530. The metal substrate 530 is used to reflect the radiation of the first antenna element 410 and the second antenna element 420, and the center of the metal substrate 530 has a virtual normal line l. The at least one first plate 510 is disposed relative to the metal substrate 530 and connected to the metal substrate 530. The second plate 520 is floated on the metal substrate 530 along the virtual normal line l, and is completely separated from the at least one first plate 510 to form a closed slot 540. In addition, the antenna device 300 may further include a support member 550, and the support member 550 is disposed between the second plate 520 and the metal substrate 530 to support the second plate 520. It is worth noting that the metal substrate 530, the at least one first plate 510 and the second plate 520 form a cavity 560, and the cavity 560 is connected to the closed slot 540. It is worth noting that the closed slot 540 is located on a plane (not shown separately), and the two excitation sources 411 and 421 are projected onto the plane to form two excitation source regions (not shown separately), respectively. Each excitation source region is located in the closed slot 540 .

[0066] Thus, the antenna device 300 of the present invention utilizes the reflector structure 500 and changes the path of the radiation emitted from the excitation source 411 and the other excitation source 421 through the closed slot 540 and the cavity 560 of the reflector structure 500, so as to maintain good impedance matching and high gain radiation characteristics of the antenna.

[0067] Specifically, in Figure 5 and Figure 6In the embodiment, the number of at least one first plate 510 can be plural, and the antenna device 300 can further include a plurality of support columns 600, each support column 600 being respectively disposed between the antenna substrate 430 and the first plate 510. In addition, each support column 600 can also be disposed between the antenna substrate 430 and the second plate 520, and used to support the antenna structure 400.

[0068] In addition, the metal substrate 530 may include a substrate 531, a metal layer 532 and a metal ring 533, wherein the substrate 531 has a surface (not labeled). The metal layer 532 is disposed on the surface and is used to reflect the radiation of the first antenna element 410 and the second antenna element 420, wherein the metal layer 532 may be a general metal material and attached to the substrate 531 through a coating process technology. One end of the metal ring 533 is disposed around the outer periphery of the metal layer 532, and the other end of the metal ring 533 is connected to each first plate 510. Therefore, the metal layer 532, the metal ring 533, each first plate 510 and the second plate 520 form a cavity 560.

[0069] Figure 7 FIG. 1 is a perspective diagram of an antenna device 300a according to a fourth embodiment of another aspect of the present invention. Figure 7 In the fourth embodiment, the configuration relationship between the reflector structure 500a and the support column 600a is the same as Figure 5 The corresponding elements in the third embodiment are the same, so they are not described in detail. Figure 7 As shown, the antenna structure 400a may include a first antenna element 410a, a second antenna element 420a and an antenna substrate 430a, wherein the first antenna element 410a and the second antenna element 420a may be a broadband antenna.

[0070] In addition, the antenna substrate 430a has a first surface 431a and a second surface 432a opposite to the first surface 431a. The first antenna element 410a includes a first radiating element 4101a and a second radiating element 4102a. The second antenna element 420a includes a first radiating element 4201a and a second radiating element 4202a. In particular, the first radiating element 4101a of the first antenna element 410a and the first radiating element 4201a of the second antenna element 420a are both disposed on the first surface 431a. The second radiating element 4102a of the first antenna element 410a and the second radiating element 4202a of the second antenna element 420a are both disposed on the second surface 432a. The first radiating element 4101a and the second radiating element 4102a of the first antenna element 410a are respectively disposed on different surfaces, and the first radiating element 4101a and the second radiating element 4102a can be connected to each other through the feeding end F and the grounding end G of the excitation source 411a. Similarly, the first radiation element 4201a and the second radiation element 4202a of the second antenna element 420a are respectively disposed on different surfaces, and the first radiation element 4201a and the second radiation element 4202a may be interconnected via the feeding end F and the ground end G of the excitation source 421a.

[0071] Please refer to Figures 5 to 8 ,in Figure 8 for Figure 5 Schematic diagram of a top view of the antenna device 300. In detail, each first plate 510 is arranged at intervals along the other end of the metal ring 533, and a slot 570 is provided between each two first plates 510, and each slot 570 is connected to the closed slot 540. In more detail, the closed slot 540 may have a first width W1, and each slot 570 may have a second width W2, and the first width W1 and the second width W2 are both greater than or equal to 2 mm and less than or equal to 14 mm, that is, the first width W1 and the second width W2 are between 2 mm and 14 mm, but the present invention is not limited thereto. It is worth noting that in the third embodiment, the closed slot 540 and each slot 570 may be connected to each other in a tic-tac-toe shape, and the width of the closed slot 540 and each slot 570 is the same. However, in other embodiments, the width of the closed slot 540 and each slot 570 may also be different, so the present invention is not limited to this embodiment.

[0072] Fig. 9 for Figure 5 A schematic diagram showing the measurement of the peak gain (PeakGain) of the antenna structure 400 corresponding to different first widths W1 and second widths W2. Figure 8It can be seen that the antenna structure 400 can cover an operating frequency band. The antenna structure 400 corresponds to the peak gain of the operating frequency band according to the first width W1 and the second width W2. When the first width W1 and the second width W2 increase, the peak gain of the antenna structure 400 gradually increases.

[0073] Please refer to Figure 5 and Fig.10 ,in Fig.10 for Figure 5 The measurement diagram of the S11 parameter corresponding to different heights of the antenna structure 400 is shown in FIG. The cavity 560 may have a height H that is greater than or equal to 6 mm and less than or equal to 14 mm, that is, the height H of the cavity 560 is between 6 mm and 14 mm, but the present invention is not limited thereto.

[0074] like Fig.10 As shown, with the S11 parameter = -6dB as a reference, the antenna structure 400 corresponds to a specific operating frequency band according to the height H, and when the height H increases, the operating frequency band decreases. In detail, the height H of the cavity 560 is the height of the metal ring 533, and the reflector structure 500 of the present invention can correspond to different operating frequency bands according to different heights H. For example: when the antenna structure 400 is a dual-polarized dipole antenna, the operating frequency band is between 0.7GHz and 1GHz; when the antenna structure 400 is a broadband antenna, the operating frequency band is between 1700MHz and 2700MHz, and the dual-polarized dipole antenna and the broadband antenna are well-known technologies and are not the focus of the present invention, and the details will not be repeated.

[0075] Please refer to Figure 5 and Figures 11 to 13B ,in Fig.11 for Figure 5 A schematic diagram of measuring the peak gain of the antenna structure 400 corresponding to different reflectors and distances D. Fig.12 for Figure 5 Schematic diagram of measuring the S11 parameter of the antenna structure 400 corresponding to different reflectors and distances. Fig.13A for Figure 5 The antenna structure 400 corresponds to a Smith chart of different reflectors and distances D. Fig. 13B for Figure 5 Another Smith chart of the antenna structure 400 corresponding to different reflectors and distances D. Figure 5 It can be known that there may be a distance D (ie, the height of each support column 600 ) between the antenna structure 400 and the reflector structure 500 . The distance D may be between 0.1 and 0.2 wavelengths of the center frequency of the operating frequency band, but the present invention is not limited thereto.

[0076] like Figures 11 to 13BAs shown, the distance D between the reflector structure 500 and the antenna structure 400 is compared with the distance between a general antenna and a known reflector. Under the same length (EX: 45mm), the antenna device 300 of the present invention can maintain good impedance matching (i.e., better S11 parameters), high gain radiation characteristics (i.e., higher peak gain) and better front-to-back ratio (F / B ratio). Thus, by overlapping the reflector structure 500 and the antenna structure 400, the overall height of the antenna device 300 is 1 / 8 of the wavelength less than the overall height of the known antenna.

[0077] It can be seen from the above embodiments that the present invention has the following advantages: First, by adjusting the first width and the second width of the reflector structure, the antenna device can not only be applied to various antenna structures, but also improve the peak gain. Second, the reflector structure of the present invention can be used to reduce the overall height of the antenna device, thereby reducing the volume. Third, the reflector structure and the antenna device are simple in structure, low in manufacturing cost, and suitable for application in current network communication products.

[0078] Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Any person skilled in the art should be able to make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on what is defined in the attached claims.

Claims

1. A reflector structure for reflecting radiation from an antenna, the antenna having an excitation source, and the reflector structure comprising: a metal substrate, the metal substrate is used to reflect the radiation of the antenna, and the center of the metal substrate has a virtual normal line; At least one first plate, the at least one first plate is disposed relative to the metal substrate and connected to the metal substrate; and a second plate, the second plate being floated on the metal substrate along the virtual normal line and completely separated from the at least one first plate to form a closed slot; The closed slot is located on a plane, the excitation source is projected onto the plane to form an excitation source area, and the excitation source area is located in the closed slot; The metal substrate comprises: a substrate having a surface; a metal layer, which is disposed on the surface of the substrate and is used to reflect radiation from the antenna; and A metal ring, one end of which is disposed around the outer periphery of the metal layer, and the other end of the metal ring is connected to the at least one first plate; The metal layer, the metal ring, the at least one first plate and the second plate form a cavity, and the cavity is connected to the closed slot.

2. The reflector structure according to claim 1, further comprising: A supporting member is disposed between the second flat plate and the metal substrate to support the second flat plate.

3. The reflective plate structure as described in claim 1, wherein the number of the at least one first flat plate is multiple, each of the first flat plates is arranged at intervals along the other end of the metal ring, and there is a slot between every two of the first flat plates, and each slot is connected to the closed slot respectively. 4 . The reflective plate structure as claimed in claim 3 , wherein the closed slots and the slots are connected to each other in a tic-tac-toe shape. 5 . The reflective plate structure as claimed in claim 3 , wherein the closed slot has a first width, each of the slots has a second width, and the first width and the second width are both greater than or equal to 2 mm and less than or equal to 14 mm.

6. An antenna device, comprising: An antenna structure having at least one excitation source; as well as A reflector structure, the reflector structure is used to reflect the radiation of the antenna structure, and the reflector structure includes: a metal substrate having a virtual normal line; At least one first plate, the at least one first plate is disposed opposite to the metal substrate and connected to the metal substrate; and a second plate, the second plate being floated on the metal substrate along the virtual normal line and completely separated from the at least one first plate to form a closed slot; The closed slot is located on a plane, the at least one excitation source is projected onto the plane to form an excitation source area, and the excitation source area is located in the closed slot; The metal substrate comprises: a substrate having a surface; a metal layer, the metal layer being disposed on the surface of the substrate and used for reflecting radiation of the antenna structure; and A metal ring, one end of which is disposed around the outer periphery of the metal layer, and the other end of the metal ring is connected to the at least one first plate; The metal layer, the metal ring, the at least one first plate and the second plate form a cavity, and the cavity is connected to the closed slot.

7. The antenna device as claimed in claim 6, wherein the antenna structure comprises: An antenna substrate having a first surface and a second surface; a first antenna element, the first antenna element being disposed on either the first surface or the second surface; and a second antenna element disposed on the other of the first surface and the second surface; Wherein, the antenna structure is a dual-polarized dipole antenna or a broadband antenna.

8. The antenna device according to claim 7, further comprising: A plurality of support columns are respectively disposed between the antenna substrate and the at least one first flat plate or the second flat plate, and are used to abut against the antenna substrate.

9. The antenna device according to claim 6, further comprising: A supporting member is disposed between the second flat plate and the metal substrate to support the second flat plate.

10. The antenna device as claimed in claim 6, wherein the at least one first plate is multiple in number, each of the first plates is spaced apart from each other along the other end of the metal ring, and a slot is provided between every two of the first plates, and each slot is connected to the closed slot respectively. 11 . The antenna device as claimed in claim 10 , wherein the closed slot and each of the slots are connected to each other in a cross shape. 12 . The antenna device as claimed in claim 10 , wherein the closed slot has a first width, each of the slots has a second width, and the first width and the second width are both greater than or equal to 2 mm and less than or equal to 14 mm. 13 . The antenna device as claimed in claim 12 , wherein the antenna structure covers an operating frequency band, and the antenna structure corresponds to a peak gain of the operating frequency band according to the first width and the second width, and when the first width and the second width increase, the peak gain increases. 14 . The antenna device as claimed in claim 6 , wherein the antenna structure covers an operating frequency band, and there is a distance between the antenna structure and the reflector structure, and the distance is between 0.1 times and 0.2 times the wavelength of the center frequency of the operating frequency band. 15 . The antenna device as claimed in claim 6 , wherein the cavity has a height, the antenna structure corresponds to an operating frequency band according to the height, and when the height increases, the operating frequency band decreases. 16 . The antenna device as claimed in claim 7 , wherein the antenna structure covers an operating frequency band, and when the antenna structure is the dual-polarized dipole antenna, the operating frequency band is between 0.7 GHz and 1 GHz. 17 . The antenna device as claimed in claim 7 , wherein the antenna structure covers an operating frequency band, and when the antenna structure is the broadband antenna, the operating frequency band is between 1700 MHz and 2700 MHz.

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