Integrated cavity slot antenna and terminal device

Abstract

The application discloses an integrated cavity slot antenna, which comprises a PCB core plate, the PCB core plate has a first surface and a second surface opposite to the first surface, a first metal sheet is arranged on the first surface, a second metal sheet is arranged on the second surface, and a plurality of first metallized through holes are further arranged on the PCB core plate and penetrate from the first surface to the second surface; the PCB core plate has a first side edge, a second side edge, a third side edge and a fourth side edge, the first metallized through holes are distributed on the first side edge, the second side edge and the third side edge to form a magnetic wall structure; the first metallized through holes, the first metal sheet and the second metal sheet are integrally arranged on the PCB core plate. The first metallized through holes are directly made on the PCB core plate, the first metal sheet and the second metal sheet are arranged on the first surface and the second surface of the PCB core plate respectively to form the cavity slot antenna, the cavity slot antenna is directly formed on the PCB core plate, and no additional installation is needed, so that the tolerance problem of antenna assembly is solved.

Description

Technical Field

[0001] This invention relates to the field of antenna technology, and more particularly to an integrated cavity slot antenna and terminal equipment. Background Technology

[0002] Currently, mobile terminals require increasingly diverse functions and larger data volumes to meet diverse customer needs and provide better user experiences. Wi-Fi and BitTorrent technologies are key factors in achieving short-range, high-data-rate wireless communication and terminal interconnection. On the one hand, the expansion of terminal functions leads to an increase in internal components, further compressing the antenna clearance area. On the other hand, considering that users, while pursuing high performance, also have higher requirements for terminal appearance, thin and lightweight metal terminals are more in line with current user aesthetics. Against this backdrop, from the perspective of antenna technology, designing an antenna suitable for metal terminals in zero-clearance environments is of significant research importance. Typically, terminal antenna designs often adopt forms such as IFA, PIFA, and LOOP. These antenna design schemes can no longer meet the performance requirements in ultra-thin, zero-clearance environments.

[0003] Existing cavity slot antenna solutions use FPCs attached to plastic materials, which presents many inconveniences in terms of manufacturing costs, matching networks, and antenna consistency control. Summary of the Invention

[0004] The purpose of this invention is to provide an integrated cavity slot antenna to solve the problems of high manufacturing cost and poor antenna consistency of existing antennas.

[0005] To achieve the above objectives, the present invention provides an integrated cavity slot antenna, comprising a PCB core board, the PCB core board having a first surface and a second surface opposite to the first surface, a first metal sheet disposed on the first surface, and a second metal sheet disposed on the second surface, the PCB core board further having a plurality of first metallized vias penetrating from the first surface to the second surface; the PCB core board having a first side edge, a second side edge, a third side edge, and a fourth side edge, the first metallized vias being distributed on the first side edge, the second side edge, and the third side edge to form a magnetic wall structure, the plurality of first metallized vias, the first metal sheet, and the second metal sheet surrounding the cavity space of the cavity slot antenna, the fourth side edge forming the slot opening of the cavity slot antenna; the first metallized vias, the first metal sheet, and the second metal sheet are integrally formed with the PCB core board.

[0006] Preferably, the PCB core board has a rectangular structure, including a first side, a second side, a third side, and a fourth side corresponding to the first side edge, the second side edge, the third side edge, and the fourth side edge, respectively. The second side and the fourth side are located in the length direction of the PCB core board, and the first side and the third side are located in the width direction of the PCB core board.

[0007] Preferably, the PCB core board is further provided with at least three second metallized vias for adjusting the resonant frequency in the cavity space, and the second metallized vias are integrally provided with the PCB core board.

[0008] Preferably, there are three second metallized vias, which are located on the fourth side edge and arranged along the length of the PCB core board. One of the three second metallized vias is used to tune the 2.4G resonant point, and the other two second metallized vias are used to tune the 5G resonant point.

[0009] Preferably, the second metallized via is formed as a through hole extending from the first surface to the second surface, or the second metallized via is formed as a blind hole opened from the first surface to the second surface, or the second metallized via is formed as a blind hole opened from the second surface to the first surface.

[0010] Preferably, the PCB core board is made of FR-4 board material.

[0011] Preferably, the PCB core board is a single-layer structure or a multi-layer structure.

[0012] Preferably, the first metal sheet and the second metal sheet are made of copper.

[0013] Preferably, the lengths of the second and fourth sides are 40 mm, the lengths of the first and third sides are 20 mm, and the thickness of the cavity slot antenna is 2.5 mm.

[0014] The present invention also provides a terminal device having a display screen, a rear shell opposite to the screen, and a side wall connecting the screen and the rear shell, wherein the rear shell and the side wall are both made of metal, and the aforementioned integrated cavity slot antenna is provided on the inner side of the terminal device.

[0015] Compared with the prior art, the present invention directly fabricates a first metallized via on the PCB core board and sets a first metal sheet and a second metal sheet on the first and second surfaces of the PCB core board respectively to form a cavity slot antenna. In other words, the cavity slot antenna is directly formed on the PCB core board and integrated with the PCB core board, without the need for additional installation. This solves the tolerance problem of antenna assembly and saves labor costs. In addition, since the dielectric inside the cavity is the PCB core board, compared with the case where the dielectric is air, the dielectric constant of the PCB core board is larger, which allows the antenna size to be smaller, thereby realizing the miniaturization of the antenna. Attached Figure Description

[0016] Figure 1 This is a structural diagram of the integrated cavity slot antenna according to an embodiment of the present invention.

[0017] Figure 2 This is a structural diagram of the integrated cavity slot antenna of the present invention after removing the first and second metal plates.

[0018] Figure 3 for Figure 1 Exploded exploded diagram.

[0019] Figure 4 This is a simulated electric field diagram of the integrated cavity slot antenna according to an embodiment of the present invention.

[0020] Figure 5 This is a tuning standing wave diagram of the integrated cavity slot antenna according to an embodiment of the present invention.

[0021] Figure 6 This is an efficiency diagram of the integrated cavity slot antenna according to an embodiment of the present invention. Detailed Implementation

[0022] To illustrate the technical content, structural features, and effects of the present invention in detail, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0023] like Figures 1 to 2As shown, this embodiment of the invention provides an integrated cavity slot antenna, including a PCB core board 3. The PCB core board 3 has a first surface 31 and a second surface 32 opposite to the first surface 31. A first metal sheet 1 is disposed on the first surface 31, and a second metal sheet 2 is disposed on the second surface 32. The PCB core board 3 also has a plurality of first metallized vias 4 extending from the first surface 31 to the second surface 32. The PCB core board 3 has a first side edge, a second side edge, a third side edge, and a fourth side edge. The first metallized vias 4 are distributed on the first side edge, the second side edge, and the third side edge to form a magnetic wall structure. The plurality of first metallized vias 4, the first metal sheet 1, and the second metal sheet 2 surround the cavity space of the cavity slot antenna. The fourth side edge forms a slot opening 6 of the cavity slot antenna. The first metallized vias 4, the first metal sheet 1, and the second metal sheet 2 are integrally disposed with the PCB core board 3.

[0024] Specifically, such as Figures 2 to 3 As shown, several first through holes are opened on the first, second, and third side edges of the PCB core board 3. The first through holes are distributed as densely as possible to form a magnetic wall structure. A first metal layer 43 is electroplated or coated in the first through holes to form a first metallized via 4. The first metal layer 43 can be located on the hole wall of the first through hole or can fill the first through hole. Several first metallized vias 4, the first metal sheet 1, and the second metal sheet 2 form a cavity space. The fourth side edge is the slot opening 6 of the cavity slot antenna.

[0025] This invention forms a cavity slot antenna by directly fabricating a first metallized via 4 on the PCB core board 3 and setting a first metal sheet 1 and a second metal sheet 2 on the first surface 31 and the second surface 32 of the PCB core board 3, respectively. In other words, the cavity slot antenna is directly formed on the PCB core board 3 and integrated with the PCB core board 3, without the need for additional installation. This solves the tolerance problem of antenna assembly and saves labor costs. In addition, since the dielectric inside the cavity is the PCB core board 3, the dielectric constant of the PCB core board 3 is larger than that of the case where the dielectric is air, which allows the antenna size to be smaller, thereby realizing the miniaturization of the antenna.

[0026] In embodiments of the present invention, such as Figure 2 As shown, the PCB core board 3 has a rectangular structure, including a first side 301, a second side 302, a third side 303, and a fourth side 304 corresponding to the first side edge, the second side edge, the third side edge, and the fourth side edge, respectively. The second side edge 302 and the fourth side edge 304 are located in the length direction of the PCB core board 3, and the first side edge 301 and the third side edge 303 are located in the width direction of the PCB core board 3.

[0027] It should be noted that the PCB core board 3 can also have other structures, such as a square structure, which can be selected according to actual needs.

[0028] In this embodiment of the invention, the PCB core board 3 is a single-layer structure or a multi-layer structure. Specifically, the PCB core board 3 can be a single-layer structure or a multi-layer structure with two or more layers. The multi-layer configuration increases the thickness of the cavity slot antenna, and the specific number of layers can be selected based on the designed thickness of the cavity slot antenna. In this embodiment of the invention, as... Figures 1 to 3 As shown, the PCB core board 3 comprises two layers, namely a first core board 33 and a second core board 34. Of course, in some other embodiments, a thicker PCB core board 3 can also be used.

[0029] In this embodiment of the invention, at least three second metallized vias 5 are also provided on the PCB core board 3 for adjusting the resonant frequency within the cavity space. The second metallized vias 5 are integrated with the PCB core board 3. By integrating the second metallized vias 5 with the PCB core board 3, no additional installation is required, solving the tolerance problem in antenna assembly and saving labor costs. The number of second metallized vias 5 can be adjusted according to the actual antenna setup requirements, and can be four or more.

[0030] In embodiments of the present invention, such as Figures 2 to 3 As shown, there are three second metallized vias 5, located on the fourth side edge and arranged along the length of the PCB core board 3. One of the three second metallized vias 5 is used to tune the 2.4G resonant point, and the other two are used to tune the 5G resonant point. Specifically, the three second metallized vias 5 are a first metal hole 51, a second metal hole 52, and a third metal hole 53. The first metal hole 51 is located in the middle of the fourth side edge, and the second metal hole 52 and the third metal hole 53 are located on both sides of the first metal hole 51. Figure 4 This is a simulated electric field diagram of the antenna according to an embodiment of the present invention. As can be seen from the diagram, the strong electric field region of the antenna's fundamental mode is located in the central region of the cavity space. Therefore, the first metal hole 51 is placed in this central region, which can effectively tune the 2.4G resonant point without affecting the 5G resonance. The strong field region of 5G is located at 1 / 5 and 3 / 5 of the length along the fourth side edge of the cavity space. Therefore, the second metal hole 52 and the third metal hole 53 are respectively located at these 1 / 5 and 3 / 5 locations for 5G tuning.

[0031] In this embodiment of the invention, the second metallized via 5 is formed as a second through hole extending from the first surface 31 to the second surface 32, or as a first blind hole formed from the first surface 31 to the second surface 32, or as a second blind hole formed from the second surface 32 to the first surface 31. Specifically, the second metallized via 5 can be formed by electroplating or coating a second metal layer 52 on the second through hole, or by electroplating or coating a second metal layer 52 on the blind hole. The specific hole diameter and depth are designed and selected according to the actual tuning effect. The material of the first metal layer 43 and the second metal layer 52 can be copper or tin. For example, tin can be applied to the first through hole, the second through hole, or the first blind hole or the second blind hole simultaneously during the tin coating step in the PCB manufacturing process, saving process steps and eliminating the need for post-processing.

[0032] In this embodiment of the invention, the PCB core board 3 is made of FR-4 material. Specifically, the PCB core board 3 in this embodiment of the invention can be made of conventional RF-4 material. Choosing to use conventional PCB material can effectively save costs.

[0033] In this embodiment of the invention, the first metal sheet 1 and the second metal sheet 2 are made of copper. Specifically, in this embodiment of the invention, as shown... Figure 3 As shown, two single-sided copper-clad PCBs can be selected. A third metallized via and a second metallized via 5 are preset on one of the single-sided copper-clad PCBs, and a fourth metallized via is preset on the other single-sided copper-clad PCB corresponding to the third metallized via. The two single-sided copper-clad PCBs are pressed together, and the third metallized via and the fourth metallized via are aligned to form a first metallized via 4 to form the cavity slot antenna structure of the embodiment of the present invention, which includes a first metal sheet 1, a second metal sheet 2, a first metallized via 4, and a second metallized via 5.

[0034] In embodiments of the present invention, such as Figures 2 to 3As shown, the PCB core board 3 includes a first core board 33 and a second core board 34. The first core board 33 has several third through holes 41 formed along its first, second, and third side edges. The second core board 34 has several fourth through holes 42 formed along its first, second, and third side edges. The third through holes 41 and fourth through holes 42 form a first through hole. Three fifth through holes 54 are also provided on the fourth side edge of the first core board 33, penetrating the first core board 33. No corresponding holes are provided on the second core board 34. Therefore, when the first core board 33 and the second core board 34 are pressed together, the bottom of the fifth through holes 54 is closed, forming a blind hole. This embodiment of the invention uses a laminated board, which allows for more flexible thickness settings. If the antenna thickness needs to be increased, an additional PCB core board can be added, while the other core boards can be reused without replacing the entire structure, effectively saving costs and increasing design flexibility.

[0035] In this embodiment of the invention, the lengths of the second side 302 and the fourth side 304 are 40 mm, the lengths of the first side 301 and the third side 303 are 20 mm, and the thickness of the cavity slot antenna is 2.5 mm. The cavity slot antenna of this invention is very small in size, achieving a miniaturized antenna design.

[0036] In this embodiment of the invention, Figure 5 and Figure 6 The diagram shows the antenna's standing wave ratio and efficiency. It can be seen that the antenna's average efficiency is -6.3dB, which is a relatively good cavity slot antenna design.

[0037] This invention also provides a terminal device, which has a screen for display, a rear shell disposed opposite to the screen, and a side wall connecting the screen and the rear shell. Both the rear shell and the side wall are made of metal. The integrated cavity slot antenna described above is provided on the inner side of the terminal device for use as a Wi-Fi antenna. Specifically, the terminal device can be a tablet computer, which has an all-metal structure except for the screen. Using the cavity slot antenna of this invention, excellent antenna performance can be achieved, and installation is unnecessary, avoiding installation tolerances and saving costs. Furthermore, the antenna size is small, meeting the requirements of miniaturization.

[0038] The above-disclosed examples are merely preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, any equivalent variations made in accordance with the claims of the present invention shall still fall within the scope of the present invention.

Claims

1. An integrated cavity slot antenna, characterized in that, The PCB core board has a first surface and a second surface opposite to the first surface. A first metal sheet is disposed on the first surface and a second metal sheet is disposed on the second surface. The PCB core board also has a plurality of first metallized vias extending from the first surface to the second surface. The PCB core board has a first side edge, a second side edge, a third side edge, and a fourth side edge. The first metallized vias are distributed on the first side edge, the second side edge, and the third side edge to form a magnetic wall structure. The plurality of first metallized vias, the first metal sheet, and the second metal sheet surround the cavity space of the cavity slot antenna. The fourth side edge forms the slot opening of the cavity slot antenna. The first metallized via, the first metal sheet, the second metal sheet, and the PCB core board are integrated into one unit.

2. The integrated cavity slot antenna as described in claim 1, characterized in that, The PCB core board has a rectangular structure, including a first side, a second side, a third side, and a fourth side corresponding to the first side edge, the second side edge, the third side edge, and the fourth side edge, respectively. The second side and the fourth side are located in the length direction of the PCB core board, and the first side and the third side are located in the width direction of the PCB core board.

3. The integrated cavity slot antenna as described in claim 2, characterized in that, The PCB core board is also provided with at least three second metallized vias for adjusting the resonant frequency in the cavity space. The second metallized vias are integrally formed with the PCB core board.

4. The integrated cavity slot antenna as described in claim 3, characterized in that, There are three second metallized vias, which are located on the fourth side edge and arranged along the length of the PCB core board. One of the three second metallized vias is used to tune the 2.4G resonant point, and the other two second metallized vias are used to tune the 5G resonant point.

5. The integrated cavity slot antenna as described in claim 4, characterized in that, The second metallized via is formed by a through hole extending from the first surface to the second surface, or the second metallized via is formed by a blind hole opened from the first surface to the second surface, or the second metallized via is formed by a blind hole opened from the second surface to the first surface.

6. The integrated cavity slot antenna as described in claim 1, characterized in that, The PCB core board is made of FR-4 material.

7. The integrated cavity slot antenna as described in claim 1, characterized in that, The PCB core board is a single-layer structure or a multi-layer structure.

8. The integrated cavity slot antenna as described in claim 1, characterized in that, The first metal sheet and the second metal sheet are made of copper.

9. The integrated cavity slot antenna as described in claim 2, characterized in that, The lengths of the second and fourth sides are 40 mm, the lengths of the first and third sides are 20 mm, and the thickness of the cavity slot antenna is 2.5 mm.

10. A terminal device, characterized in that, The terminal device has a display screen, a rear shell disposed opposite to the screen, and a side wall connecting the screen and the rear shell. The rear shell and the side wall are both made of metal. The inner side of the terminal device is provided with an integrated cavity slot antenna as described in any one of claims 1-9.

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