Cavity antenna of notebook computer shell

Abstract

The invention discloses a cavity antenna of a notebook computer shell. The cavity antenna comprises a metal shell cover with a rectangular opening area. The cuboid cavity is installed on the machine shell cover and embedded in the rectangular opening area. The cavity is provided with four metal side faces, a metal bottom face and an opening face, the opening face is opposite to the metal bottom face, and the opening face and the rectangular opening area are located on the same plane. The double-sided printed circuit board is provided with a feed-in surface and a coupling surface, the feed-in surface coincides with the opening surface and is superposed on the cavity, and the periphery of the feed-in surface is welded on the side surface of the cavity. The coaxial line penetrates through one metal side face, the center conductor is connected with an excitation circuit of the feed-in face, and the outer layer conductor is connected with a grounding circuit of the feed-in face and conducts the four metal side faces. The excitation circuit is coupled with the slot line block, the first high-frequency block and the second high-frequency block of the coupling surface, the slot line block is connected with one of the four metal side surfaces, and the first high-frequency block and the second high-frequency block are in floating connection. The shielding effect can be reduced.

Description

Technical Field

[0001] The invention relates to an antenna, in particular to a cavity antenna of a notebook computer shell. Background Art

[0002] In addition to pursuing small size and light weight, mobile terminal devices also require high performance. Whether in business or consumer use, handheld mobile phones (cell phones) or tablet computers are limited by the size of the device and cannot have the same performance as desktop computers (desktop computers), but other types of mobile terminals such as notebook computers and laptop computers can have performance similar to desktop computers.

[0003] Similar to the design trend of mobile phones or tablet computers, notebook computers and laptop computers often integrate visual beauty and reduce weight for the appearance of the device. Currently, metal casings are usually used as the mainstream of shell design. The advantage of using metal is that the high rigidity of metal can be used to enhance the structural strength while reducing the weight and size of the body. The economic benefits in body design are very high. However, the wireless communication performance using built-in or hidden antennas is usually affected by the shielding of the metal casing. Therefore, in the difficult situation where the antenna size is increasingly limited, antenna design manufacturers also need to overcome the problem that metal casings easily degrade antenna performance. Summary of the invention

[0004] In view of the above-mentioned defects of the prior art, the task of the present invention is to provide a cavity antenna for a notebook computer shell, the purpose of which is to solve the problem of performance degradation of the antenna used in the metal shell of the notebook computer. The technical solution of the present invention is as follows: A cavity antenna for a notebook computer housing, comprising: a housing cover, made of metal, having a rectangular opening area; A cavity is mounted on the housing cover and is in the shape of a cuboid, embedded in the rectangular opening area of ​​the housing cover and buried in the laptop computer, wherein the cavity has four metal side surfaces, a metal bottom surface and an opening surface, the opening surface and the metal bottom surface are opposite to each other, and the opening surface and the rectangular opening area are in the same plane; A double-sided printed circuit board, the size of which matches the opening surface, the double-sided printed circuit board having a feeding surface and a coupling surface, and the feeding surface overlaps the opening surface and is superimposed on the cavity, and the four sides of the double-sided printed circuit board are all welded to the four metal side surfaces of the cavity; and A coaxial line, passing through one of the four metal side surfaces, and connected to the excitation circuit of the feeding surface with a central conductor, and connected to the grounding circuit of the feeding surface with an outer conductor, and the grounding circuit conducts through the four metal side surfaces; The excitation circuit couples the slot line block, the first high frequency block and the second high frequency block of the coupling surface, wherein the slot line block is connected to one of the four metal side surfaces, and the first high frequency block and the second high frequency block are both floating.

[0005] Furthermore, the cavity is made by using laser engraving technology, and is made by engraving five metal surfaces of the dielectric material in the shape of the rectangular parallelepiped.

[0006] Furthermore, the cavity has a slotted area, and the slotted area is formed by hollowing out a long and narrow hollowed-out block from the dielectric material.

[0007] Furthermore, the four metal side surfaces are sequentially a first metal side surface, a second metal side surface, a third metal side surface and a fourth metal side surface, and the coaxial line passes through the first metal side surface, and the slot line block is connected to the second metal side surface by welding.

[0008] Furthermore, the routing of the slot line block is parallel to the first metal side surface and the third metal side surface.

[0009] Furthermore, the first high-frequency block is perpendicular to the slot line block, and the second high-frequency block is parallel to the slot line block.

[0010] Furthermore, the excitation circuit and the grounding circuit do not overlap each other, and the length and width of the grounding circuit are both shorter than the lengths of the four metal side surfaces.

[0011] Furthermore, the coupling surface of the double-sided printed circuit board is covered by a trademark pattern or a model pattern, and the trademark pattern or the model pattern is made of a non-metallic material.

[0012] Furthermore, the cavity antenna of the laptop computer housing is used for the usage frequency band specified by WiFi 6E.

[0013] Furthermore, the cavity antenna of the laptop computer housing is used to operate in wireless local area networks and 5Gsub-6 frequency bands, including 2.4GHz, 5100MHz-5900MHz, and a frequency range from above 6GHz to 7.125GHz.

[0014] The advantages of the present invention compared with the prior art are: The present invention integrates the antenna into the metal casing cover. The antenna is modular and has an independent structure. The antenna characteristics are relatively stable and are not easily affected by the casing cover and the internal structure of the casing. The invention can also reduce the metal shielding effect of the notebook computer itself and has high industrial application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The figure is a schematic diagram of the appearance of a notebook computer housing provided by an embodiment of the present invention.

[0016] Figure 2 It is a schematic diagram of the inner side of the notebook computer housing provided by an embodiment of the present invention.

[0017] Figure 3 It is a perspective view of a cavity antenna of a notebook computer housing provided by an embodiment of the present invention.

[0018] Figure 4 The invention is a schematic diagram of separating a double-sided printed circuit board and a cavity of a cavity antenna of a notebook computer housing provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with the embodiments, but are not intended to limit the present invention.

[0020] Please refer to Figures 1 to 4 , Figure 1 This is a schematic diagram of the appearance of a laptop computer case. Figure 2 This is a schematic diagram of the inside of a laptop computer case. Figure 3 This is a perspective view of the cavity antenna in the laptop case. Figure 4 Schematic diagram of the separation of the double-sided printed circuit board 3 and the cavity 2 of the cavity antenna of the notebook computer housing, wherein Figure 4 The double-sided printed circuit board 3 is also presented in a perspective view, and the coaxial line 4 is Figure 3 The cavity antenna of the laptop computer housing includes a housing cover 1, a cavity 2, a double-sided printed circuit board 3 and a coaxial line 4. The housing cover 1 is made of metal and has a rectangular opening area 11. Figure 1 The rectangular opening area 11 in the cavity 2 is aligned with the double-sided printed circuit board 3, which will be described later. The cavity 2 is installed in the casing cover 1, and is in the shape of a rectangular parallelepiped. It is embedded in the rectangular opening area 11 of the casing cover 1 and buried in the laptop computer. The so-called appearance of the laptop computer shell is the back of the laptop computer screen (not shown), and the inside of the laptop computer shell is the internal structure of the body (including the part combined with the screen assembly). Preferably, the rectangular opening area 11 is located at the upper side of the casing cover 1 when the laptop computer is in use mode, that is, behind the screen and close to the upper edge. For example, the upper edge of the rectangular opening area 11 maintains a distance of 10 mm to 20 mm from the uppermost edge of the casing cover 1, but it is not limited thereto.

[0021] Refer to Figures 2 to 4The cavity 2 has four metal side surfaces (21, 22, 23, 24), a metal bottom surface 25 and an opening surface 26. In this embodiment, the four metal side surfaces are the first metal side surface 21, the second metal side surface 22, the third metal side surface 23 and the fourth metal side surface 24 in sequence. The opening surface 26 and the metal bottom surface 25 are opposite to each other. The opening surface 26 and the rectangular opening area 11 are in the same plane. In addition, because the cavity 2 is embedded in the rectangular opening area 11 of the housing cover 1 and buried in the laptop computer, the opening surface 26 and the rectangular opening area 11 are aligned with each other. The length, width and height of the cavity 2 of this embodiment are 40 mm, 10 mm and 8.5 mm respectively. The long side corresponds to the first metal side surface 21 and the third metal side surface 23, and the short side corresponds to the second metal side surface 22 and the fourth metal side surface 24. The distance between the metal bottom surface 25 and the opening surface 26 is the height. Accordingly, the length and width of the opening surface 26 are 40 mm and 10 mm respectively.

[0022] Reference Figure 3 and Figure 4 The size of the double-sided printed circuit board 3 matches the opening surface 26. The double-sided printed circuit board 3 has a feeding surface 31 and a coupling surface 32. The feeding surface 31 is located in the positive direction of the Y axis compared to the coupling surface 32. In addition, the double-sided printed circuit board 3 is superimposed on the cavity 2 with the feeding surface 31 overlapping the opening surface 26. The four sides of the double-sided printed circuit board 3 are all welded to the four metal side surfaces (21, 22, 23, 24) of the cavity 2. In actual implementation, the four metal side surfaces (21, 22, 23, 24) are all grounded. Therefore, the physical manufacturing is that the four sides of the double-sided printed circuit board 3 have their own frames on the feeding surface 31 and the coupling surface 32, and the frame of the double-sided printed circuit board 3 is fixed to the four metal side surfaces (21, 22, 23, 24) by using through holes or other technologies. The coaxial line 4 passes through one of the four metal side surfaces, and the excitation circuit 311 of the feeding surface 31 is connected with the central conductor 41.

[0023] In the present embodiment, the coaxial line 4 is taken as an example to penetrate the fourth metal side 24, but the present invention is not limited to this. In addition, the coaxial line 4 is connected to the grounding line 312 of the feeding surface 31 through the outer conductor 42, and the grounding line 312 conducts the four metal sides. In fact, the grounding line 312 only needs to conduct one of the metal sides to conduct the other three metal sides, so the grounding line 312, the outer conductor 42 and the four metal sides (21, 22, 23, 24) are all grounded together. The above-mentioned grounding line 312, for example, is directly connected to the first metal side 21, and can be conducted to the other three metal sides (22, 23, 24). Among them, the excitation line 311 couples the slot line block 321, the first high-frequency block 322 and the second high-frequency block 323 of the coupling surface 32, wherein the slot line block 321 connects one of the four metal sides, for example Figure 3 and Figure 4 The second metal side 22 in the cavity 2 is connected to the slot line block 321, that is, the slot line block 321 is grounded. For the opening surface 26, the slot line block 321 is equivalent to making a slot on the opening itself, so that the opening surface 26 is subject to a restriction (boundary condition), which affects the resonance condition of the cavity 2. On the other hand, the first high-frequency block 322 and the second high-frequency block 323 are both floating. The detailed configuration of the slot line block 321, the first high-frequency block 322 and the second high-frequency block 323 will be described later. The relative relationship of the XYZ axes in the figure is defined by the right-hand rule. Figure 1 The plane where the X-axis and the Z-axis are located is the plane of the appearance of the housing cover 1, wherein the X-axis is parallel to the upper edge of the housing cover 1 and parallel to the rotation axis of the laptop computer (not shown in the figure), and the rotation axis is well known to those with ordinary knowledge in the field and will not be described in detail. The positive direction of the Y-axis is the direction toward the housing with a keyboard (the keyboard in the figure is not shown), and the keyboard of the laptop computer is well known to those with ordinary knowledge in the field and will not be described in detail.

[0024] Preferably, the cavity 2 is made by laser engraving technology, and is made by engraving five metal surfaces (21, 22, 23, 24, 25) of the dielectric material in the shape of the rectangular parallelepiped. The dielectric constant of the dielectric material is selectable. Compared with using air as the material, the dielectric material can reduce the cavity size and antenna efficiency. The dielectric constant of the dielectric material of this embodiment is, for example, 2.9, and the dielectric loss tangent is, for example, 0.007. For the same required operating frequency, the difference in the dielectric constant of the dielectric material used will cause the length, width, and height of the cavity 2 to be fine-tuned.

[0025] Furthermore, the slot line block 321, the first high-frequency block 322 and the second high-frequency block 323 are, for example, all in the shape of long strips, or the main structures are all in the shape of long strips. The slot line block 321 is connected to the second metal side 22 by welding. Furthermore, the routing of the slot line block 321 is parallel to the first metal side 21 and the third metal side 23. Furthermore, the first high-frequency block 322 is roughly perpendicular to the slot line block 321, and the second high-frequency block 323 is roughly parallel to the slot line block 321. To explain in another way, when the double-sided printed circuit board 3 is assembled at the position of the opening surface 26, the slot line block 321 of the coupling surface 32 is connected to the second metal side 22, the ground line 312 of the feeding surface 31 is connected to the first metal side 21, and the first high-frequency block 322 and the second high-frequency block 323 of the coupling surface 32 are not connected to any metal side. Furthermore, Figure 3 and Figure 4 The first high frequency block 322 and the second high frequency block 323 each have a small portion as a curved section (bent 90 degrees), which can be used to adjust the matching of the corresponding working modes, but the present invention is not limited thereto.

[0026] Preferably, the cavity 2 further has a slotted area 27, which is made by hollowing out a thin and long hollowed-out block of dielectric material, and is used to appropriately improve the antenna efficiency in certain frequency ranges. For example, the slotted area 27 of this embodiment is parallel to the slot line block 321, and the slotted area 27 and the slot line block 321 maintain a specific distance to improve the antenna efficiency in the frequency range of 2.4 GHz. Figure 3 and Figure 4 In the figure, the slotted area 27 hollowed out of the dielectric material is represented by a thin and long rectangular parallelepiped, and is shown as a block hollowed out in the positive direction of the Y axis.

[0027] Preferably, the excitation circuit 311 and the ground circuit 312 do not overlap each other, as shown in the figure. Preferably, the excitation circuit 311 has at least two to three bends, as shown in the figure, and the end has a reverse bend, so that the end and the initial section have increased coupling with each other. The length and width of the ground circuit 312 are both shorter than the length of the four metal sides. As shown in the figure, the ground circuit 312 is a small rectangle, and the excitation circuit 311 and the ground circuit 312 do not overlap or connect with each other in any part.

[0028] Furthermore, in terms of the product's appearance design, the coupling surface 32 of the double-sided printed circuit board 3 can be covered by a trademark pattern or a model pattern, and the trademark pattern or model pattern is made of a non-metallic material. In other words, the area of ​​the coupling surface 32 can be covered by a non-metallic or non-electromagnetic shielding thin rectangular object, and covered by gluing or locking. That is to say, after assembly, the coupling surface 32 of the double-sided printed circuit board 3 is located on the opening surface 26, and the top of the coupling surface 32 is covered by a thin object of a trademark pattern or a model pattern made of a non-metallic material to hide the antenna component and have the effect of appearance design without affecting the antenna performance.

[0029] In terms of the function of the antenna, the cavity antenna of the laptop computer housing of this embodiment is mainly used for the use frequency band specified by WiFi 6E, that is, the wireless local area network (WLAN) and the so-called 5G sub-6 frequency band. For example, it includes the frequency range of 2.4GHz and 5100MHz-5900MHz, and even includes the frequency range from 6GHz to 7.125GHz. The length of the slot line block 321 is used to control the frequency point of the basic resonance mode of 2.4GHz. The length of the first high-frequency block 322 is used to control the frequency point of the resonance mode at about 5.7GHz. The length of the second high-frequency block 323 is mainly used to control the frequency point of the resonance mode at about 6.8GHz, where the resonance mode is the third-order resonance mode of the 2.4GHz resonance mode. In short, the slot line block 321 is used to control the excitation frequency point of the 2.4GHz band, the first high-frequency block 322 is used to adjust the excitation frequency point of the 5GHz band, and the second high-frequency block 323 is used to adjust the excitation frequency point of the 6GHz band. In terms of matching the frequency bands used, in order to meet the return loss of 6dB at 2.4GHz and the return loss of 6dB at 5.15GHz to 7.125GHz, the relevant dimensions of the structure are as follows: the length of the slot area 21 is 18mm, and the depth of the slot is between 1mm and 1.5mm. The length of the slot line block 321 is 20mm, the length of the first high-frequency block 322 is 12mm, and the length of the second high-frequency block 323 is 3mm. The length of the excitation line 311 is between 5mm and 6mm. In terms of antenna efficiency in actual application, the antenna of this embodiment operates in the notebook computer mode (opening the notebook computer for the user to operate with the keyboard), and the gain in the 2.4GHz band is about 0dBi, and the gain in the band above 5GHz is between 0dBi and less than 5dBi. The efficiency in the 2.4GHz band is between -4dB and -5dB, and the efficiency in the band above 5GHz is between -5dB and -6dB or better. For the closed mode (the laptop computer case is closed so that the keyboard and screen are folded together), the design of this embodiment can achieve an antenna efficiency that is not inferior to that of the laptop computer mode. The antenna efficiency specifications defined for laptop computer products usually vary according to the performance, power consumption and communication specifications of the wireless chip. The efficiency value range described above is only applicable to examples available in the market, which should be understood by those skilled in the art, so it will not be repeated.

[0030] In summary, the cavity antenna of the laptop computer case provided in the embodiment of the present invention integrates the antenna into the metal case cover. The antenna is modular, and this modular antenna has an independent structure. The antenna characteristics are relatively stable and not easily affected by the case cover and the internal structure of the case. It can also reduce the metal shielding effect of the laptop computer itself, and has high industrial application value.

Claims

1. A cavity antenna for a notebook computer housing, characterized in that: include: a housing cover, made of metal, having a rectangular opening area; A cavity is mounted on the housing cover and is in the shape of a cuboid, embedded in the rectangular opening area of ​​the housing cover and buried in the laptop computer, wherein the cavity has four metal side surfaces, a metal bottom surface and an opening surface, the opening surface and the metal bottom surface are opposite to each other, and the opening surface and the rectangular opening area are in the same plane; A double-sided printed circuit board, the size of which matches the opening surface, the double-sided printed circuit board having a feeding surface and a coupling surface, and the feeding surface overlaps the opening surface and is superimposed on the cavity, and the four sides of the double-sided printed circuit board are all welded to the four metal side surfaces of the cavity; and A coaxial line, passing through one of the four metal side surfaces, and connected to the excitation circuit of the feeding surface with a central conductor, and connected to the grounding circuit of the feeding surface with an outer conductor, and the grounding circuit conducts through the four metal side surfaces; The excitation circuit couples the slot line block, the first high frequency block and the second high frequency block of the coupling surface, wherein the slot line block is connected to one of the four metal side surfaces, and the first high frequency block and the second high frequency block are both floating.

2. The cavity antenna of the notebook computer housing according to claim 1, characterized in that: The cavity is made by laser engraving technology, and is made by engraving five metal surfaces of the dielectric material in the shape of the rectangular parallelepiped.

3. The cavity antenna of the notebook computer housing according to claim 2, characterized in that: The cavity has a slotted area, and the slotted area is formed by hollowing out a long and narrow hollowed-out block from the dielectric material.

4. The cavity antenna of the notebook computer housing according to claim 1, characterized in that: The four metal side surfaces are the first metal side surface, the second metal side surface, the third metal side surface and the fourth metal side surface in sequence, and the coaxial line passes through the first metal side surface, and the slot line block is connected to the second metal side surface by welding.

5. The cavity antenna of the notebook computer housing according to claim 4, characterized in that: The routing of the trench line block is parallel to the first metal side surface and the third metal side surface.

6. The cavity antenna of the notebook computer housing according to claim 1, characterized in that: The first high-frequency block is perpendicular to the slot line block, and the second high-frequency block is parallel to the slot line block.

7. The cavity antenna of the notebook computer housing according to claim 1, characterized in that: The exciting circuit and the grounding circuit do not overlap each other, and the length and width of the grounding circuit are both shorter than the lengths of the four metal side surfaces.

8. The cavity antenna of the notebook computer housing according to claim 1, characterized in that: The coupling surface of the double-sided printed circuit board is covered by a trademark pattern or a model pattern, and the trademark pattern or the model pattern is made of a non-metallic material.

9. The cavity antenna of the notebook computer housing according to claim 1, characterized in that: The cavity antenna of the laptop computer case is used for the frequency band specified by WiFi 6E.

10. The cavity antenna of the notebook computer housing according to claim 1, characterized in that: The cavity antenna of the laptop computer housing is used to operate in wireless local area networks and 5G sub-6 frequency bands, including 2.4GHz, 5100MHz-5900MHz, and a frequency range from above 6GHz to 7.125GHz.

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