Antenna device, antenna device, and impedance adjustment mechanism

Abstract

The invention provides an antenna apparatus, an antenna device, and an impedance adjusting mechanism. The antenna device comprises a carrier, an impedance adjusting mechanism arranged corresponding to the carrier, and an antenna mechanism arranged on the impedance adjusting mechanism. The impedance adjusting mechanism comprises a grounding layer arranged on the carrier and an impedance adjusting layer spaced from the grounding layer; a projection area formed by orthographic projection of the impedance adjusting layer towards the grounding layer is located in the outer edge of the grounding layer; at least one long gap concavely arranged to the center of the impedance adjusting layer is formed in the impedance adjusting layer from the outer contour of the impedance adjusting layer; the antenna mechanism is suitable for a center frequency, and the thickness of the impedance adjusting mechanism is 0.4%-25% of a wavelength corresponding to the center frequency. According to the antenna equipment, the antenna device and the impedance adjusting mechanism, the impedance adjusting layer adopts a brand-new structural design different from the prior art, and the impedance adjusting layer is matched with the grounding layer, so that the impedance adjusting mechanism can be applied to the antenna mechanism with smaller thickness, and better antenna efficiency is synchronously realized.

Description

Technical Field

[0001] The present invention relates to an impedance adjustment mechanism, and more particularly to an antenna device, an antenna assembly, and an impedance adjustment mechanism. Background Art

[0002] Most of the existing impedance adjustment mechanisms for adjusting antenna impedance are limited to specific architectures, such as patch antennas. Therefore, it is not easy to further improve the existing impedance adjustment mechanisms to enhance their value. Thus, the inventor believes that the above defects can be improved, and through painstaking research and the application of scientific principles, the present invention with a reasonable design and effective improvement of the above defects is finally proposed. Summary of the Invention

[0003] Embodiments of the present invention provide an antenna device, an antenna assembly, and an impedance adjustment mechanism, which can effectively improve the defects that may occur in existing impedance adjustment mechanisms.

[0004] An embodiment of the present invention discloses an antenna device, which includes: a carrier; an impedance adjustment mechanism disposed corresponding to the carrier, and the impedance adjustment mechanism includes: a ground layer disposed on the carrier; and an impedance adjustment layer spaced apart from the ground layer, and a projection area formed by the orthogonal projection of the impedance adjustment layer towards the ground layer is located within the outer edge of the ground layer; wherein, at least one elongated slit is recessed from the outer contour of the impedance adjustment layer to its center; and an antenna mechanism disposed on the impedance adjustment mechanism, and the antenna mechanism is applicable to a center frequency, and the thickness of the impedance adjustment mechanism is 0.4% to 25% of a wavelength corresponding to the center frequency.

[0005] An embodiment of the present invention also discloses an impedance adjustment mechanism, which includes: a ground layer; and an impedance adjustment layer spaced apart from the ground layer, and a projection area formed by the orthogonal projection of the impedance adjustment layer towards the ground layer is located within the outer edge of the ground layer; wherein, at least one elongated slit is recessed from the outer contour of the impedance adjustment layer to its center.

[0006] An embodiment of the present invention further discloses an antenna assembly, which includes: an impedance adjustment mechanism, which includes: a ground layer; and an impedance adjustment layer spaced apart from the ground layer, and a projection area formed by the orthogonal projection of the impedance adjustment layer towards the ground layer is located within the outer edge of the ground layer; wherein, a slit is formed in the impedance adjustment layer; and an antenna mechanism disposed on the impedance adjustment mechanism, and the antenna mechanism is applicable to a center frequency, and the thickness of the impedance adjustment mechanism is 0.4% to 25% of a wavelength corresponding to the center frequency.

[0007] Another embodiment of the present invention discloses an antenna device, which includes: an impedance adjustment mechanism disposed corresponding to a carrier, and the impedance adjustment mechanism includes: a grounding layer disposed on the carrier; and an impedance adjustment layer spaced apart from the grounding layer, and a projection area formed by the orthogonal projection of the impedance adjustment layer facing the grounding layer is located within the outer edge of the grounding layer; wherein, a slit is formed in the impedance adjustment layer; and an antenna mechanism disposed on the impedance adjustment mechanism, and the antenna mechanism is applicable to a center frequency, and the thickness of the impedance adjustment mechanism is 0.4% to 25% of a wavelength corresponding to the center frequency.

[0008] In summary, the antenna device, the antenna apparatus, and the impedance adjustment mechanism disclosed in the embodiments of the present invention adopt a brand-new structural design different from the prior art (such as: at least one elongated slit or slit) for the impedance adjustment layer, and the impedance adjustment layer is paired with the grounding layer, so that the impedance adjustment mechanism can be applied to the antenna mechanism with a smaller thickness and simultaneously achieve better antenna efficiency.

[0009] For a further understanding of the features and technical content of the present invention, please refer to the following detailed description and drawings of the present invention. However, these descriptions and drawings are only used to illustrate the present invention and do not impose any limitation on the protection scope of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 Is a three-dimensional schematic diagram of the antenna device according to Embodiment 1 of the present invention.

[0011] Figure 2 Is Figure 1 A top view schematic diagram after omitting the box body and the reader.

[0012] Figure 3 Is Figure 2 A cross-sectional schematic diagram along the section line III-III.

[0013] Figure 4 Is a simulation test schematic diagram of the antenna device according to Embodiment 1 of the present invention.

[0014] Figure 5 Is a top view schematic diagram (one) of the impedance adjustment mechanism according to Embodiment 1 of the present invention.

[0015] Figure 6 Is a top view schematic diagram (two) of the impedance adjustment mechanism according to Embodiment 1 of the present invention.

[0016] Figure 7 Is a top view schematic diagram (three) of the impedance adjustment mechanism according to Embodiment 1 of the present invention.

[0017] Figure 8 Is a top view schematic diagram (four) of the impedance adjustment mechanism according to Embodiment 1 of the present invention.

[0018] Figure 9 Top view schematic diagram (V) of the impedance adjustment mechanism according to the first embodiment of the present invention.

[0019] Figure 10 Top view schematic diagram of the impedance adjustment mechanism according to the second embodiment of the present invention.

[0020] Figure 11 Top view schematic diagram (I) of the impedance adjustment mechanism according to the third embodiment of the present invention.

[0021] Figure 12 Top view schematic diagram (II) of the impedance adjustment mechanism according to the third embodiment of the present invention.

[0022] Description of main component symbols:

[0023] 100 Antenna device

[0024] 10 Antenna device

[0025] 1 Impedance adjustment mechanism

[0026] 11 Ground layer

[0027] 12 Impedance adjustment layer

[0028] 121 Outer contour

[0029] 122 Opening

[0030] 123 Longitudinal slit

[0031] 124 Inner slit

[0032] 125 Outer slit

[0033] 126 Slit

[0034] 127 Circular layout area

[0035] 13 Dielectric layer

[0036] 131 Accommodating hole

[0037] 2 Antenna mechanism

[0038] 21 Electronic component

[0039] 22 Sensing antenna

[0040] 23 Insulating layer

[0041] 3 Carrier

[0042] 4 Box body

[0043] 41 Storage space

[0044] 5 Reader

[0045] H Thickness direction

[0046] R Layout distance

[0047] C Center

[0048] W123 Width

[0049] S Adjustment block

[0050] σ1 First angle

[0051] σ2 Second angle

[0052] σS Central angle

[0053] H1 Thickness

[0054] L1, L2, L3 Curves Detailed implementation manners

[0055] The following are specific embodiments to illustrate the implementation manners of the present invention regarding "antenna device, antenna apparatus, and impedance adjustment mechanism". Those skilled in the art can understand the advantages and effects of the present invention from the content disclosed in this specification. The present invention can be implemented or applied through other different specific embodiments, and various details in this specification can also be modified and changed based on different viewpoints and applications without departing from the concept of the present invention. Additionally, the drawings of the present invention are only for simple schematic illustration and are not drawn according to actual dimensions, which is stated in advance. The following implementation manners will further elaborate on the related technical content of the present invention, but the disclosed content is not used to limit the protection scope of the present invention.

[0056] It should be understood that although terms such as "first", "second", "third", etc. may be used herein to describe various elements or signals, these elements or signals should not be limited by these terms. These terms are mainly used to distinguish one element from another, or one signal from another. Additionally, the term "or" used herein should, depending on the actual situation, possibly include any one or a combination of multiple of the associated listed items.

[0057] [Embodiment 1]

[0058] Please refer to Figures 1 to 9 as shown, which is Embodiment 1 of the present invention. As Figures 1 to 3 shown, this embodiment discloses an antenna device 100, which preferably includes a carrier 3, an antenna mechanism 2 spaced apart from the carrier 3, an impedance adjustment mechanism 1 disposed between the carrier 3 and the antenna mechanism 2, a box body 4 for accommodating the above-mentioned multiple components, and a reader 5 installed on the box body 4, but the present invention is not limited thereto.

[0059] For example, in other embodiments not shown in the present invention, at least one of the box body 4 and the reader 5 of the antenna device 100 may be omitted according to design requirements; alternatively, the impedance adjustment mechanism 1 and the antenna mechanism 2 may be combined and referred to as an antenna device 10, which can be used alone (such as: sold) or used in combination with other components; or, the impedance adjustment mechanism 1 can also be used alone (such as: sold) or used in combination with other components.

[0060] In this embodiment, the carrier 3 is in a flat sheet shape and may be a high-loss medium, such as: an absorbing material, a wafer, or a metal sheet, but the present invention is not limited thereto. The box body 4 is formed with a plurality of storage spaces 41, and the carrier 3, the impedance adjustment mechanism 1, and the antenna mechanism 2 are jointly disposed in one of the storage spaces 41 of the box body 4, and the reader 5 can be used to read the signal output by the antenna mechanism 2, so as to measure the specific position of the carrier 3 in the box body 4. It should be additionally noted that the antenna device 100 is described in this embodiment as being applied to the semiconductor field, and the box body 4 is, for example, a front opening unified pod (FOUP), and the carrier 3 is, for example, a wafer, but the present invention is not limited thereto.

[0061] The impedance adjustment mechanism 1 is disposed corresponding to the carrier 3, and the antenna mechanism 2 is disposed on the impedance adjustment mechanism 1. That is to say, the impedance adjustment mechanism 1 is clamped between the carrier 3 and the antenna mechanism 2. Among them, the antenna mechanism 2 is applicable to a center frequency, and the thickness H1 of the impedance adjustment mechanism 1 is 0.4% - 25% of a wavelength corresponding to the center frequency.

[0062] More specifically, in this embodiment, the impedance adjustment mechanism 1 includes a ground layer 11 disposed on the carrier 3, an impedance adjustment layer 12 spaced from the ground layer 11 along the thickness direction H, and a dielectric layer 13 clamped between the ground layer 11 and the impedance adjustment layer 12. Among them, the resonant frequency of the impedance adjustment layer 12 can be adjusted by its size (such as: Figure 4 the presented curves L1, L2, L3), and the size configuration of the impedance adjustment layer 12 is preferably as follows: a layout distance R between the outer contour 121 of the impedance adjustment layer 12 and its center C, which is 25% - 45% of the wavelength, but the present invention is not limited thereto.

[0063] Furthermore, the impedance adjustment layer 12 is preferably located directly above the ground layer 11 so that the ground layer 11 can be used to shield one side of the impedance adjustment layer 12. That is to say, a projection area formed by the impedance adjustment layer 12 projecting orthogonally towards the ground layer 11 is located within the outer edge of the ground layer 11.

[0064] In addition, the dielectric layer 13 is formed of an insulating material and its relative dielectric constant is preferably between 1 and 6, but it can be adjusted according to design requirements, but the present invention is not limited thereto. For example, in other embodiments not shown in the present invention, the impedance adjustment mechanism 1 can also omit the dielectric layer 13 (or, the dielectric layer 13 is equivalent to an air dielectric layer).

[0065] The antenna mechanism 2 includes an electronic component 21 (e.g., a sensing chip) disposed on the impedance adjustment mechanism 1, a sensing antenna 22 electrically coupled to the electronic component 21, and an insulating layer 23 disposed on the impedance adjustment layer 12 and carrying the sensing antenna 22 (i.e., the insulating layer 23 separates the impedance adjustment layer 12 and the sensing antenna 22).

[0066] In this embodiment, the impedance adjustment layer 12 forms an opening 122 for the electronic component 21 to be disposed therein, and the dielectric layer 13 forms a receiving hole 131 connected to the opening 122 , so that the electronic component 21 passes through the opening 122 and the receiving hole 131 and is disposed on the ground layer 11 .

[0067] Furthermore, the opening 122 is preferably formed at the center C of the impedance adjustment layer 12, and the area of the opening 122 is not greater than 10% of the area surrounded by the outer contour 121 of the impedance adjustment layer 12, and the receiving hole 131 is not greater than the opening 122 and exposes a portion of the ground layer 11 for the electronic component 21 to be placed thereon, but the present invention is not limited thereto. For example, in other embodiments not shown in the present invention, the opening 122 may also deviate from the center C of the impedance adjustment layer 12; or, the receiving hole 131 may not completely penetrate the dielectric layer 13, and its depth may be adjusted according to design requirements; or, the impedance adjustment layer 12 may not form the opening 122, the dielectric layer 13 may not form the receiving hole 131, and the electronic component 21 may be directly disposed on the impedance adjustment layer 12.

[0068] Furthermore, the antenna projection area formed by the orthographic projection of the sensing antenna 22 toward the top surface of the impedance adjustment layer 12 completely falls on the top surface and does not cover any gaps. In other words, the portion of the impedance adjustment layer 12 corresponding to the sensing antenna 22 preferably has no gaps formed, but the present invention is not limited thereto.

[0069] The above is a description of the matching between the impedance adjustment mechanism 1 and the antenna mechanism 2. In order to make the impedance adjustment mechanism 1 have better operating performance, the impedance adjustment layer 12 can be structurally designed according to actual needs. The following only selects some of the better examples from the various feasible structural designs of the impedance adjustment layer 12 for description (such as: Figures 5 to 9 ), but the present invention is not limited thereto.

[0070] It should be further noted that the outer contour 121 of the impedance adjustment layer 12 is described as a circle in the following content of this embodiment. However, in other embodiments not shown in the present invention, the outer contour 121 of the impedance adjustment layer 12 can also be adjusted and changed according to design requirements (such as: polygon).

[0071] As Figure 3 and Figure 5 shown, the impedance adjustment layer 12 has a long slit 123 recessed from the outer contour 121 to the center C; that is to say, the long slit 123 communicates with the opening 122, and the long slit 123 is linear and penetrates the impedance adjustment layer 12 in the thickness direction H. In other words, the impedance adjustment layer 12 may only have the long slit 123 (and the opening 122) in this embodiment. In addition, the width W123 of the long slit 123 is preferably not greater than 3% of the wavelength. Accordingly, when the antenna device 10 adopts the impedance adjustment layer 12 as Figure 5 shown, its antenna efficiency is approximately 0.239 or more. Among them, the antenna efficiency is equal to the gain divided by the directivity.

[0072] As Figure 3 , Figure 6 , and Figure 7 shown, the number of the long slits 123 formed by the impedance adjustment layer 12 can also be N, and N is a positive integer and preferably an even number. Among them, the N long slits 123 are preferably arranged in pairs in a straight line so that the impedance adjustment layer 12 is divided into N adjustment blocks S that are separated from each other. Furthermore, as Figure 7 shown, each adjustment block S has a central angle σS with respect to the center C, and the difference between the central angles σS of any two adjustment blocks S is preferably not greater than 120 degrees.

[0073] In other words, the impedance adjustment layer 12 may only have N long slits 123 (and the opening 122). It should be further noted that in this embodiment Figure 6 shown, N is 2, and when the antenna device 10 adopts the impedance adjustment layer 12 as Figure 6 shown, its antenna efficiency is approximately 0.291 or more. Furthermore, Figure 7 shown, N is 4, and when the antenna device 10 adopts the impedance adjustment layer 12 as Figure 7 shown, its antenna efficiency is approximately 0.286 or more. In addition, in other embodiments not shown in the present invention, N can be an even number greater than 6; or, N can also be a positive integer greater than 1 and an odd number.

[0074] As Figure 3 and Figure 8As shown, on the basis of forming a long slit 123, the impedance adjustment layer 12 can further form a plurality of inner slits 124 from the center C towards the outer contour 121, and the width of each inner slit 124 is preferably not greater than 3% of the wavelength. Among them, the lengths of the plurality of inner slits 124 are substantially the same (e.g., 50% - 80% of the layout distance) and communicate with the opening 122 but do not touch the outer contour 121, and each inner slit 124 is linear and penetrates the impedance adjustment layer 12 along the thickness direction H, but not limited thereto. For example, in other embodiments not shown in the present invention, the lengths of the plurality of inner slits 124 may be slightly different.

[0075] In other words, in this embodiment, the impedance adjustment layer 12 can be formed only with a plurality of inner slits 124 and a long slit 123 (and an opening 122). Furthermore, in this embodiment Figure 8 of which, the number of inner slits 124 formed by the impedance adjustment layer 12 is illustrated by two, and each inner slit 124 and the long slit 123 preferably form a first angle σ1 between 85 degrees and 165 degrees. Accordingly, when the antenna device 10 adopts the impedance adjustment layer 12 as Figure 8 shown, its antenna efficiency is generally 0.417 or more.

[0076] As Figure 3 and Figure 9 shown, on the basis of forming a long slit 123 and a plurality of inner slits 124, the impedance adjustment layer 12 can further form a plurality of outer slits 125 from the outer contour 121 towards the center C, and the width of each outer slit 125 is preferably not greater than 3% of the wavelength.

[0077] Among them, the lengths of the plurality of outer slits 125 are substantially the same (e.g., 50% - 80% of the layout distance) and do not touch the center C (that is, do not communicate with the opening 122), and each outer slit 125 is linear and penetrates the impedance adjustment layer 12 along the thickness direction H, but not limited thereto. For example, in other embodiments not shown in the present invention, the lengths of the plurality of outer slits 125 may be slightly different. In other words, in this embodiment, the impedance adjustment layer 12 can be formed only with a plurality of outer slits 125, a plurality of inner slits 124, and a long slit 123 (and an opening 122).

[0078] Furthermore, one outer slit 125 or a long slit 123 is arranged between any two adjacent inner slits 124, so that the impedance adjustment layer 12 defines M adjustment blocks S, M is a positive integer, and the M adjustment blocks S are a single-piece structure adjacent to each other as a whole. Moreover, each adjustment block S has a central angle σS with respect to the center C, and the difference between the central angles σS of any two adjustment blocks S is preferably not greater than 60 degrees.

[0079] More specifically, among those in this embodiment Figure 9 , the number of inner slits 124 formed by the impedance adjustment layer 12 is four, and the number of outer slits 125 formed by the impedance adjustment layer 12 is three. Among them, two inner slits 124 far from the long slit 123 preferably sandwich the long slit 123 with a first angle σ1 between 15 degrees and 75 degrees, and two inner slits 124 adjacent to the long slit 123 preferably sandwich the long slit 123 with a second angle σ2 between 25 degrees and 65 degrees. Accordingly, when the antenna device 10 adopts the impedance adjustment layer 12 as shown in Figure 9 , its antenna efficiency is generally 0.409 or more.

[0080] As described above, as shown in Figures 1 to 9 , the antenna device 100, the antenna device 10, and the impedance adjustment mechanism 1 in this embodiment can, through the structural design of the impedance adjustment layer 12 (such as: at least one long slit 123) and its cooperation with the ground layer 11, enable the impedance adjustment mechanism 1 to be applied to the antenna mechanism 2 with a smaller thickness (such as: 0.4% to 25% of the wavelength) and simultaneously achieve a better antenna efficiency (such as: 0.239 or more).

[0081] [Embodiment 2]

[0082] Please refer to Figure 10 shown, which is Embodiment 2 of the present invention. Since this embodiment is similar to the above-mentioned Embodiment 1, the same parts of the two embodiments will not be described in detail, and the main difference between this embodiment and the above-mentioned Embodiment 1 lies in: the impedance adjustment layer 12.

[0083] In this embodiment, the impedance adjustment layer 12 is formed with a slit 126, and the width of each slit 126 is preferably not greater than 3% of the wavelength. The slit 126 is formed by extending from the center C of the impedance adjustment layer 12 towards the outer contour 121, and the slit 126 does not touch the outer contour 121. Among them, the slit 126 is linear and penetrates the impedance adjustment layer 12 in the thickness direction, and the length of the slit 126 is generally greater than 50% of the layout distance R. In other words, the impedance adjustment layer 12 in this embodiment can be formed with only the slit 126 (and the opening 122).

[0084] [Embodiment 3]

[0085] Please refer to Figure 11 and Figure 12 shown, which is Embodiment 3 of the present invention. Since this embodiment is similar to the above-mentioned Embodiment 1, the same parts of the two embodiments will not be described in detail, and the main difference between this embodiment and the above-mentioned Embodiment 1 lies in: the impedance adjustment layer 12.

[0086] In this embodiment, the impedance adjustment layer 12 is formed with a slit 126, and the width of each slit 126 is preferably not greater than 3% of the wavelength. The slit 126 is linear and penetrates the impedance adjustment layer 12 in the thickness direction. Among them, the length of the slit 126 is greater than 50% of the layout distance R. In other words, the impedance adjustment layer 12 may be formed only with the slit 126 in this embodiment.

[0087] Furthermore, in this embodiment, the impedance adjustment layer 12 defines a circular layout area 127, the center of which is the center C of the impedance adjustment layer 12, and the area of the circular layout area 127 is between 15% and 25% of the area surrounded by the outer contour 121 of the impedance adjustment layer 12, but the present invention is not limited thereto. In this embodiment, the slit 126 intersects (or passes through) the circular layout area 127.

[0088] Furthermore, when the impedance adjustment layer 12 of this embodiment meets the above conditions, the position of the slit 126 can be adjusted and changed according to design requirements. For example, as Figure 11 shown, the slit 126 can be formed by extending from the outer contour 121, and the slit 126 does not pass through the center C. Or, as Figure 12 shown, the slit 126 may not touch the outer contour 121 (and passes through the center C).

[0089] [Technical effects of the embodiments of the present invention]

[0090] In summary, the antenna device, antenna apparatus, and impedance adjustment mechanism disclosed in the embodiments of the present invention adopt a brand-new structural design different from the prior art (such as: at least one elongated slit or slit) through the impedance adjustment layer, and the impedance adjustment layer is combined with the ground layer, so that the impedance adjustment mechanism can be applied to the antenna mechanism with a smaller thickness and simultaneously achieve better antenna efficiency.

[0091] Furthermore, the antenna device, antenna apparatus, and impedance adjustment mechanism disclosed in the embodiments of the present invention can effectively enable the sensing antenna to radiate normally when its total thickness is less than 1% of the wavelength corresponding to the center frequency, so that the sensing antenna can achieve the efficiency that the corresponding total thickness should have.

[0092] The content disclosed above is only the preferred feasible embodiments of the present invention, and does not limit the patent scope of the present invention. Therefore, all equivalent technical changes made by using the content of the specification and drawings of the present invention are included in the patent scope of the present invention.

Claims

1. An antenna device, the antenna device comprising: A carrier; An impedance adjustment mechanism, the impedance adjustment mechanism being provided corresponding to the carrier, and the impedance adjustment mechanism comprising: A ground layer, the ground layer being provided on the carrier; and An impedance adjustment layer, the impedance adjustment layer being spaced apart from the ground layer, and a projection area formed by the impedance adjustment layer projecting orthogonally towards the ground layer is located within the outer edge of the ground layer; wherein, at least one elongated slit is recessed from the outer contour of the impedance adjustment layer to its center; and An antenna mechanism, the antenna mechanism being provided on the impedance adjustment mechanism, and the antenna mechanism being adapted to a center frequency, and the thickness of the impedance adjustment mechanism being 0.4% to 25% of a wavelength corresponding to the center frequency.

2. The antenna device according to claim 1, wherein The antenna device includes a box body, the box body is formed with a plurality of storage spaces, and the carrier, the impedance adjustment mechanism, and the antenna mechanism are jointly provided in one of the storage spaces.

3. The antenna device according to claim 2, wherein, The antenna device includes a reader installed on the box body, and the reader can be used to read the signal output by the antenna mechanism.

4. The antenna device according to claim 1, wherein, The carrier is in a flat sheet shape, and the carrier is a high-loss medium.

5. The antenna device according to claim 1, wherein, The antenna mechanism includes: An electronic component, the electronic component being provided on the impedance adjustment mechanism; A sensing antenna, the sensing antenna being electrically coupled to the electronic component; and An insulating layer, the insulating layer being provided on the impedance adjustment layer and carrying the sensing antenna to separate the impedance adjustment layer from the sensing antenna.

6. The antenna device according to claim 5, wherein The impedance adjustment layer is formed with an opening communicating with at least one of the elongated slits, and the electronic component is provided within the opening; wherein, the area of the opening is not greater than 10% of the area surrounded by the outer contour of the impedance adjustment layer.

7. The antenna device according to claim 6, wherein, The impedance adjustment mechanism includes a dielectric layer clamped between the ground layer and the impedance adjustment layer, and the dielectric layer is formed with a receiving hole communicating with the opening, and the electronic component passes through the opening and the receiving hole and is provided on the ground layer.

8. The antenna device according to claim 5, wherein, An antenna projection area formed by the sensing antenna projecting orthogonally towards the top surface of the impedance adjustment layer completely falls on the top surface and does not cover any slits.

9. The antenna device according to claim 1, wherein, A layout distance between the outer contour of the impedance adjustment layer and the center is 25% to 45% of the wavelength.

10. The antenna device according to claim 1, wherein, The width of at least one of the elongated slits is not greater than 3% of the wavelength.

11. An impedance adjustment mechanism, the impedance adjustment mechanism comprising: A ground layer; And An impedance adjustment layer, the impedance adjustment layer being spaced apart from the ground layer, and a projection area formed by the impedance adjustment layer projecting orthogonally towards the ground layer is located within the outer edge of the ground layer; Wherein, at least one elongated slit is recessed from the outer contour of the impedance adjustment layer to its center.

12. The impedance adjusting mechanism according to claim 11, wherein, The number of at least one of the elongated gaps is one, and the impedance adjustment layer forms two inner gaps from the center toward the outer contour; wherein the two inner gaps do not touch the outer contour, and each of the inner gaps and the elongated gap form a first angle between 85 degrees and 165 degrees.

13. The impedance adjustment mechanism according to claim 11, wherein, The number of at least one of the elongated gaps is one, and the impedance adjustment layer forms a plurality of inner gaps from the center toward the outer contour, and the impedance adjustment layer forms a plurality of outer gaps from the outer contour toward the center; wherein, the plurality of the inner gaps do not touch the outer contour, and the plurality of the outer gaps do not touch the center, and one of the outer gaps or the elongated gap is arranged between any two adjacent inner gaps.

14. The impedance adjustment mechanism according to claim 13, wherein, The impedance adjustment layer is defined with M adjustment blocks, where M is a positive integer, and the M adjustment blocks are adjacent to each other and are integrated into a single-piece structure.

15. The impedance adjusting mechanism according to claim 11, wherein, The number of at least one of the elongated gaps is N, and N is a positive integer, so that the impedance adjustment layer is divided into N adjustment blocks separated from each other.

16. The impedance adjustment mechanism according to claim 15, wherein, Each of the adjustment blocks has a central angle relative to the center, and a difference between the central angles of any two of the adjustment blocks is no greater than 120 degrees.

17. The impedance adjustment mechanism according to claim 11, wherein, The impedance adjustment layer is formed with an opening connected to at least one of the elongated gaps and located at the center, the impedance adjustment mechanism includes a dielectric layer clamped between the ground layer and the impedance adjustment layer, and the dielectric layer is formed with a receiving hole connected to the opening; wherein the relative dielectric constant of the dielectric layer is between 1 and 6.

18. An antenna device, comprising: An impedance adjustment mechanism, the impedance adjustment mechanism comprising: a ground plane; and an impedance adjustment layer, the impedance adjustment layer and the ground layer are spaced apart, and a projection area formed by the impedance adjustment layer being projected toward the ground layer is located within the outer edge of the ground layer; wherein a gap is formed in the impedance adjustment layer; and An antenna mechanism is provided on the impedance adjustment mechanism, and the antenna mechanism is suitable for a center frequency, and the thickness of the impedance adjustment mechanism is 0.4% to 25% of a wavelength corresponding to the center frequency.

19. The antenna device according to claim 18, wherein, The slit is formed by extending from the center of the impedance adjustment layer toward the outer contour thereof, and the slit does not touch the outer contour.

20. The antenna device according to claim 18, wherein, There is a layout distance between the outer contour of the impedance adjustment layer and the center thereof, and the length of the gap is greater than 50% of the layout distance.

21. The antenna device according to claim 18, wherein, The impedance adjustment layer defines a circular layout area, the center of the circular layout area is the center of the impedance adjustment layer, and the area of the circular layout area is between 15% and 25% of the area surrounded by the outer contour of the impedance adjustment layer; wherein the gap intersects the circular layout area.

22. The antenna device according to claim 21, wherein, The gap does not pass through the center of the circular layout area.

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