Antenna device

Abstract

An antenna device includes a first sheet body; a second sheet body disposed on a substrate, the second sheet body being a trapezoidal metal sheet including a first bottom side and a second bottom side that are relatively parallel and spaced apart, and a first waist side and a second waist side connecting the first bottom side and the second bottom side, the second sheet body further having a slot hole that is parallel and spaced apart from the first waist side and extends to the second waist side; a first shorting sheet body connecting the first bottom side and the first sheet body; a second shorting sheet body connecting the second bottom side and the first sheet body; and a dielectric disposed between the first sheet body and the second sheet body. By adding two shorting sheet bodies to the trapezoidal antenna device with a slot hole, the antenna device can achieve a broadband effect and the purpose of reducing the antenna size.

Description

Technical Field

[0001] The present application relates to an antenna device, particularly to a miniaturized microstrip antenna device with broadband characteristics. Background Art

[0002] With the rapid development of communication technologies, various communication products, such as Wireless Access Points, smart phones, and laptop computers, have gradually become part of human life. Most of these communication products have antenna devices to achieve wireless transmission functions to meet the needs of consumers. However, as communication products have more and more functions and smaller and smaller volumes, antenna devices not only need to provide multiple frequency bands but also need to have a smaller volume. Summary of the Invention

[0003] In view of this, an embodiment of the present application provides an antenna structure that is miniaturized and can achieve a broadband effect.

[0004] An embodiment of the present application discloses an antenna device, including a first sheet; a second sheet disposed on a substrate, the second sheet being a trapezoidal metal sheet including a first bottom side and a second bottom side that are relatively parallel and spaced apart, and a first waist side and a second waist side connecting the first bottom side and the second bottom side, the second sheet further having a slot, the slot being parallel and spaced apart from the first waist side and extending to the second waist side; a first short - circuit sheet connecting the first bottom side and the first sheet; a second short - circuit sheet connecting the second bottom side and the first sheet; and a dielectric disposed between the first sheet and the second sheet.

[0005] According to an embodiment of the present application, the first sheet is coupled to the ground potential.

[0006] According to an embodiment of the present application, it further includes a connection device, the connection device including a connection terminal having a first connection end and a second connection end, the first connection end being coupled to the ground potential, and the second connection end being electrically connected to the second sheet.

[0007] According to an embodiment of the present application, the connection terminal passes through the first sheet, the dielectric, and the substrate, and the second connection end is electrically connected to the feeding point of the second sheet.

[0008] According to an embodiment of the present application, the second sheet is a right - angled trapezoidal metal sheet.

[0009] According to an embodiment of the present application, the second waist side is perpendicular to the first bottom side and the second bottom side.

[0010] According to an embodiment of the present application, the first shorting plate body is parallel to the second shorting plate body and orthogonal to the second plate body.

[0011] According to an embodiment of the present application, the medium is air, plastic, glass or ceramic.

[0012] The antenna device provided according to an embodiment of the present application can obtain a broadband effect by adding a second shorting plate body to a trapezoidal PIFA antenna device with a slot. Therefore, the antenna device has multiple selectivities in practical applications. For example, it can be used for indoor or short-distance communication, and communication with a base station of a wireless mobile communication system on the ground. In addition, the size area of the antenna device is approximately half of that of a traditional triangular PIFA antenna with a slot, and the height is less than 0.06λ0, achieving the purpose of reducing the antenna size. Moreover, the operating bandwidth can cover the frequency bands required for 3G and WLAN (1920 MHz - 2483 MHz). Therefore, the antenna device can be applied to wireless communication devices. Description of the Drawings

[0013] Figure 1 It is a schematic structural view of the antenna device according to an embodiment of the present application from a side view angle.

[0014] Figure 2 is Figure 1 a schematic structural view of the front view angle of the second plate body of the shown antenna device.

[0015] Figure 3 It is a schematic size view of the antenna device according to an embodiment of the present application.

[0016] Figure 4 is Figure 1 a return loss diagram of the shown antenna device.

[0017] Figure 5A , 5B , 5C is Figure 1 a radiation pattern diagram of the shown antenna device.

[0018] Description of the Main Element Symbols

[0019] Antenna device 100

[0020] First plate body 10

[0021] Second plate body 20

[0022] First bottom side 21

[0023] Second bottom side 22

[0024] First waist side 23

[0025] Second waist side 24

[0026] Substrate 25

[0027] Feeding point 26

[0028] Slot 28

[0029] End points 281, 283

[0030] Dielectric 30

[0031] Connecting device 40

[0032] Connection terminal 42

[0033] First connection end 421

[0034] Second connection end 422

[0035] First short - circuit plate A

[0036] Second short - circuit plate B

[0037] Parameters c, d, e, f, g, s, w

[0038] Curve V

[0039] The following specific embodiments will further illustrate the present invention in conjunction with the above - mentioned drawings. Specific embodiments

[0040] For the convenience of those skilled in the art of the present invention to understand and implement the present invention, the present invention will be further described in detail below in conjunction with the drawings and embodiments. It should be understood that the present invention provides many applicable inventive concepts, which can be implemented in various specific forms. Those skilled in the art of the present invention can utilize the details described in these embodiments or other embodiments and other available structural, logical, and electrical changes to implement the invention without departing from the spirit and scope of the present invention.

[0041] The specification of the present invention provides different embodiments to illustrate the technical features of different embodiments of the present invention. Among them, the configuration of each element in the embodiments is for illustrative purposes and is not intended to limit the present invention. And the partial repetition of the reference numerals in the embodiments is for the purpose of simplifying the description and does not mean the relevance between different embodiments. Among them, the same reference numerals used in the drawings and the specification represent the same or similar elements. The drawings in this specification are in simplified form and are not drawn to an exact scale. For the sake of clarity and convenience of description, directional terms (such as top, bottom, up, down, and diagonal) are for the accompanying drawings. And the directional terms used in the following description are not used to limit the scope of the present invention when not explicitly used in the following appended claims.

[0042] Furthermore, in describing some embodiments of the present application, the specification describes the methods and / or procedures of the present application in a specific step sequence. However, since the methods and procedures are not necessarily implemented according to the specific step sequence described, they are not limited to the specific step sequence. Those skilled in the art of the present invention will know that other sequences are also possible implementation manners. Therefore, the specific step sequence described in the specification is not used to limit the scope of the patent application. Furthermore, the scope of the patent application for the methods and / or procedures of the present application is not limited to the execution step sequence written therein, and those skilled in the art of the present invention can understand that adjusting the execution step sequence does not depart from the spirit and scope of the present invention.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which this invention belongs. The terms used in the specification of the present invention herein are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items. The following describes in detail some embodiments of the present application with reference to the accompanying drawings. In the case of no conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0044] Figure 1 A schematic structural diagram showing a side view of an antenna device according to an embodiment of the present application. Refer to Figure 1 , according to an embodiment of the present application, an antenna device 100 is provided. The antenna device 100 may be a microstrip antenna, such as a Planar Inverted-F Antenna (PIFA), and can be applied to a wireless mobile communication system. The antenna device 100 includes a first sheet body 10, a second sheet body 20, a first short-circuit sheet body A, a second short-circuit sheet body B, a dielectric 30, and a connecting device 40. According to an embodiment of the present application, the first sheet body 10 is a grounded metal sheet and is coupled to the ground potential through the connecting device 40. The second sheet body 20 is disposed on the surface of the substrate 25 away from the first sheet body 10, and the substrate 25 may be a PCB board made of FR4 material. The connecting device 40 includes a connecting terminal 42. The two ends of the connecting terminal 42 are respectively a first connecting end 421 and a second connecting end 422. The first connecting end 421 is coupled to the ground potential. The connecting terminal 42 passes through the first sheet body 10 and the dielectric 30 and is electrically connected to the feeding point of the second sheet body 20 with the second connecting end 422. The material of the dielectric 30 is an insulating substance, which is disposed between the first sheet body 10 and the second sheet body 20. The operating frequency and bandwidth of the antenna device 100 can be changed due to the different dielectric constants of the insulating substances. In this embodiment, the dielectric 30 is air. However, those skilled in the art can determine the insulating substances to be selected according to the characteristics of the signals, such as plastics, glass, or ceramics.

[0045] In addition, referring to Figure 1 , the first short - circuit sheet body A is connected to the second sheet body 20 and the first sheet body 10, and the second short - circuit sheet body B is also connected to the second sheet body 20 and the first sheet body 10. According to an embodiment of the present application, the first short - circuit sheet body A and the second short - circuit sheet body B are parallel to each other and orthogonal to the second sheet body 20. That is, from Figure 1 the side view shown, the first short - circuit sheet body A is perpendicular to the first sheet body 10 and the second sheet body 20, and the second short - circuit sheet body B is also perpendicular to the first sheet body 10 and the second sheet body 20, and the first short - circuit sheet body A and the second short - circuit sheet body B are substantially parallel to the connection terminals 42 of the connection device 40.

[0046] Figure 2 Show Figure 1 a schematic structural view of the front view of the second sheet body 20 of the antenna device shown. According to an embodiment of the present application, the second sheet body 20 is a trapezoidal metal sheet, including a first bottom edge 21 and a second bottom edge 22 that are relatively parallel and spaced apart, and a first waist edge 23 and a second waist edge 24 that connect the first bottom edge 21 and the second bottom edge 22. The second sheet body 20 also has a slot hole 28. The slot hole 28 is elongated and has two end points 281, 283. The slot hole 28 is arranged in parallel and spaced from the first waist edge 23 and extends to the second waist edge 24. As Figure 2 shown, the end point 281 of the slot hole 28 is located on the second waist edge 24, and the end point 283 of the slot hole 28 far from the second waist edge 24 is at a first predetermined distance from the first bottom edge 21 and at a second predetermined distance from the second waist edge 24. The ratio of the first predetermined distance to the second predetermined distance can be determined according to the length of the slot hole 28, and those skilled in the art can adjust the length of the slot hole 28 according to the signal characteristic requirements. According to other embodiments of the present application, the slot hole 28 can also be separated from the second waist edge 24, for example, the end point 281 is not located on the second waist edge 24. According to other embodiments of the present application, the slot hole 28 can also extend at other angles, for example, extend in a non - parallel manner to the first waist edge 23, and those skilled in the art can adjust the angle and position of the slot hole 28 according to the signal characteristic requirements.

[0047] According to an embodiment of the present application, the second sheet body 20 can be a right - angled trapezoidal metal sheet. When the second sheet body 20 is a right - angled trapezoidal metal sheet, the second waist edge 24 is perpendicular to the first bottom edge 21 and the second bottom edge 22. As Figure 2 shown, the first short - circuit sheet body A and the second short - circuit sheet body B are respectively formed on the first bottom edge 21 and the second bottom edge 22 and are arranged between the first sheet body 10 and the second sheet body 20. According to an embodiment of the present application, the first short - circuit sheet body A and the second short - circuit sheet body B are short - circuit metal sheets. From Figure 2 the front view shown, the first short - circuit sheet body A and the second short - circuit sheet body B are parallel.

[0048] The feeding point 26 is located near the second waist side 24, and the second connection end 422 of the connecting device 40 is electrically connected to the feeding point 26 of the second sheet 20. According to an embodiment of the present application, the feeding point 26 may be at the same distance from the first shorting sheet A and the second shorting sheet B. In other embodiments, the distance ratio range between the feeding point 26 and the first shorting sheet A and the second shorting sheet B may be from 1:0.5 to 1:1, specifically 1:0.84. However, the position of the feeding point 26 is not limited thereto, and those skilled in the art can determine the position of the feeding point 26 according to the characteristics of the signal.

[0049] Figure 3 Show a schematic diagram of the dimensions of the second sheet of the antenna device according to an embodiment of the present application. Refer to Figure 3 , the width of the first shorting sheet A is the parameter w, the width of the second shorting sheet B is the parameter s, the length of the first bottom side 21 is the parameter e, and the length of the second bottom side 22 is the parameter f. The slot 28 is at a distance of the parameter c from the first bottom side 21 along the X-axis direction at the end point of the second waist side 24, and at a distance of the parameter d from the first bottom side 21 at the other end point along the X-axis direction, and at a distance of the parameter g from the second waist side 24 along the Y-axis direction. According to an embodiment of the present application, w = 11 mm, s = 4 mm, e = 30 mm, f = 4.5 mm, c = 41 mm, d = 10 mm, g = 18 mm.

[0050] In addition, the feeding point 26 may be at the same distance from the first shorting sheet A and the second shorting sheet B. In other embodiments, the range between the feeding point 26 and the first shorting sheet A and the second shorting sheet B may be from 1:0.5 to 1:1, specifically 1:0.84, and the range of the distance between the feeding point 26 and the second waist side 24 may be from 0 mm to 3 mm, specifically located on the second waist side 24. However, the position of the feeding point 26 is not limited thereto, and those skilled in the art can determine the position of the feeding point 26 according to the characteristics of the signal.

[0051] Figure 4 Show Figure 1 The echo loss diagram of the antenna device shown. Refer to Figure 4 , the horizontal axis represents the frequency, in gigahertz (GHz); the vertical axis represents the return loss, in decibels (dB). Curve V represents the signal characteristics generated by the antenna device 100 according to an embodiment of the present application. As Figure 4 shown, the center frequency of the antenna device 100 is approximately 2300 MHz, and the operating bandwidth is approximately 483 MHz (21%). Figure 5A , 5B , 5C is Figure 1 The radiation pattern diagram of the antenna device 100 shown. As shown in the figure, the antenna structure 100 has a radiation pattern similar to that of a dipole antenna.

[0052] According to an embodiment of the present application, the antenna device 100 can obtain a broadband effect by adding a second shorting plate body B to a trapezoidal PIFA antenna device having a slot hole. Therefore, the antenna device 100 has multiple selectivities in practical applications. For example, indoor or short-distance communication, and communication with a base station of a wireless mobile communication system on the ground. In addition, the size area of the antenna device 100 is approximately half of that of a traditional triangular PIFA antenna with a slot hole, and the height is less than 0.06λ0, achieving the purpose of reducing the antenna size, and the operating bandwidth can cover the frequency bands required for 3G and WLAN (1920 MHz - 2483 MHz). Therefore, the antenna device can be applied to wireless communication devices.

[0053] The features of many of the embodiments outlined above enable those of ordinary skill in the art to better understand the scope of the present invention. Those of ordinary skill in the art can design or modify other processes and structures based on this disclosure to achieve the same features and / or the same advantages introduced in the embodiments of the present invention. Those of ordinary skill in the art also understand that these equivalent structures do not depart from the spirit and scope of this disclosure, and they can also change, replace, and vary the features of the present invention without departing from the spirit and scope of the present invention, and these changes and adjustments should fall within the protection scope of the claims of the present invention.

Claims

1. An antenna device, characterized in that, The antenna device is a planar inverted-F antenna, and the antenna device includes: A first sheet body, coupled to a ground potential; A second sheet body, provided with a feeding point, the second sheet body is disposed on a first surface of a substrate, the second sheet body is a right trapezoidal metal sheet, including a first bottom edge and a second bottom edge that are relatively parallel and spaced apart, and a first waist edge and a second waist edge connecting the first bottom edge and the second bottom edge, the second sheet body further defines a slot, the slot is parallel and spaced apart from the first waist edge and extends to the second waist edge, and the second waist edge is perpendicular to the first bottom edge and the second bottom edge; A first shorting sheet body, connecting the first bottom edge and the first sheet body; A second shorting sheet body, connecting the second bottom edge and the first sheet body; and A dielectric, disposed between the first sheet body and the second sheet body.

2. The antenna device according to claim 1, characterized in that, It further includes a connecting device, the connecting device includes a connecting terminal, the connecting terminal has a first connection end and a second connection end, the first connection end is coupled to a ground potential, and the second connection end is electrically connected to the second sheet body.

3. The antenna device according to claim 2, characterized in that, The connecting terminal passes through the first sheet body, the dielectric, and the substrate, and is electrically connected to the feeding point of the second sheet body with the second connection end.

4. The antenna device according to claim 1, characterized in that, The first shorting sheet body and the second shorting sheet body are parallel and orthogonal to the second sheet body.

5. The antenna device according to claim 1, wherein, The dielectric is air, plastic, glass or ceramic.

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