Slot antenna device and electronic equipment

Abstract

The utility model discloses a slot antenna device and electronic equipment, including plate structure, variable capacitance device and voltage converter wherein the plate structure includes first slot hole and feed point, along the thickness direction of plate structure, the first slot hole passes through the plate surface of plate structure. The feeding point is located on the plate surface of the plate structure and located on one side of the first long hole in the width direction of the first long hole. And along the length direction of the first long hole, the variable capacitance device and the feeding point are arranged at an interval and are electrically connected with the plate structure. The voltage converter is electrically connected with the variable capacitance device and used for changing the capacitance value of the variable capacitance device. By adopting the slot antenna device provided by the utility model, the capacitance value of the variable capacitance device can be changed by changing the voltage value of the voltage converter, and the overall capacitance value of the antenna device is changed, so that the low-frequency resonance of the antenna device is shifted, the bandwidth of the antenna device can be effectively expanded, and the antenna device can be widely applied to the field of antenna devices. And the adaptability of the slot antenna device to different frequency band information can be improved.

Description

Technical Field

[0001] This utility model relates to the field of communication technology, and in particular to a slot antenna device and electronic equipment. Background Technology

[0002] In wireless communication devices, slot antennas, as planar structures, perfectly meet the development trends and requirements of modern wireless communication systems, thus the demand for slot antennas is increasing daily. However, traditional slot antennas have relatively narrow bandwidths, therefore, they can only meet the needs of use within a relatively small frequency range, which leads to relatively poor adaptability of slot antennas to different products.

[0003] Therefore, how to broaden the bandwidth of slot antennas to improve their adaptability to different products has become a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] This invention provides a slot antenna device and electronic device for widening the bandwidth of slot antennas and improving their adaptability to different products.

[0005] In a first aspect, this utility model provides a slot antenna device, including a plate structure, a variable capacitance device, and a voltage converter. The plate structure includes a first elongated aperture and a feed point. The first elongated aperture penetrates the surface of the plate structure along its thickness direction. The feed point is located on the surface of the plate structure and is situated on one side of the first elongated aperture along its width direction. The variable capacitance device is spaced apart from the feed point along the length direction of the first elongated aperture and is electrically connected to the plate structure. The voltage converter is electrically connected to the variable capacitance device and is used to change the capacitance value of the variable capacitance device.

[0006] Using the slot antenna device provided by this utility model, when a base station or workstation sends frequency band information of different signal strengths to the antenna, the voltage value of the voltage converter can be changed to change the capacitance value of the variable capacitance device, thereby changing the overall capacitance value of the antenna device. This causes the low-frequency resonance of the antenna device to shift, which can effectively broaden the bandwidth of the antenna device and improve the adaptability of the slot antenna device to different frequency band information.

[0007] In one possible implementation of this invention, the variable capacitance device is located at one end of the first elongated aperture along its length, and the center of the first elongated aperture is located between the variable capacitance device and the feed point. This allows for a large shift in low-frequency resonance by providing only a small capacitance value from the variable capacitance device, thereby widening the bandwidth of the antenna device.

[0008] In one possible implementation of this utility model, the first elongated hole includes a first sidewall and a second sidewall, and the first sidewall and the second sidewall intersect; the included angle between the first sidewall and the second sidewall is α, and α satisfies: 0° < α < 180°. This is to meet the bandwidth requirements of the frequency band information received by the antenna device, as well as the installation requirements of different electronic devices.

[0009] In one possible implementation of this invention, the length of the first elongated hole is A, and A satisfies: 150mm ≤ A ≤ 170mm. This is to meet the bandwidth requirements of the frequency band information received by the antenna device, as well as the installation requirements of different electronic devices.

[0010] In one possible implementation of this invention, the width of the first elongated hole is B, and B satisfies: 2mm ≤ B ≤ 3mm. This is to meet the bandwidth requirements of the frequency band information received by the antenna device, as well as the installation requirements of different electronic devices.

[0011] In one possible implementation of this invention, the variable capacitance device is a variable capacitor. Along the width direction of the first elongated hole, one contact of the variable capacitor is electrically connected to one side of the first elongated hole, and the other contact of the variable capacitor is electrically connected to the other side of the first elongated hole. This allows the variable capacitance device to change the overall capacitance value of the antenna device.

[0012] Secondly, this invention provides an electronic device, including a motherboard, a display screen, and the slot antenna device described in the first aspect. The board structure is located between the motherboard and the display screen along its thickness direction, and is electrically connected to both. Along the thickness direction of the board structure, the projection of the first elongated hole onto the extended surface of the display screen is located on the outer edge of the display screen. This reduces the risk of the display screen shielding electromagnetic waves and improves the electromagnetic wave transmission efficiency of the slot antenna device.

[0013] In one possible implementation of this invention, the electronic device further includes a mounting portion located between the board structure and the display screen along the thickness direction of the board structure, and the board structure is electrically connected to the mounting portion. The mounting portion includes a second elongated hole, and the projection of the first elongated hole onto the mounting portion is located within the edge of the second elongated hole along the thickness direction of the board structure. This effectively reduces the shielding risk of the mounting portion to electromagnetic waves and is beneficial for improving the electromagnetic wave transmission efficiency of the slot antenna device.

[0014] In one possible implementation of this invention, the mounting part is made of metal, and conductive adhesive is filled between the plate structure and the mounting part to improve the reliability of the connection between the plate structure and the mounting part.

[0015] In one possible implementation of this invention, the motherboard includes a tuning network circuit electrically connected to a power supply point to further improve signal quality. Attached Figure Description

[0016] Figure 1 A schematic diagram of a slot antenna device provided by this utility model;

[0017] Figure 2 for Figure 1 A cross-sectional view of the provided slotted antenna assembly along AA;

[0018] Figure 3 Another structural schematic diagram of the slot antenna device provided by this utility model;

[0019] Figure 4 A schematic diagram of the structure of the electronic device provided by this utility model;

[0020] Figure 5 for Figure 4 Test data for the provided electronic devices.

[0021] Reference numerals: 1-plate structure; 11-first elongated hole; 111-first sidewall; 112-second sidewall; 12-feed point; 13-plate surface; 14-grounding point; 2-variable capacity device; 3-RF line; 01-main board; 02-display screen; 03-mounting part; 031-second elongated hole. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. However, the exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein. The same reference numerals in the drawings denote the same or similar structures, and therefore repeated descriptions of them will be omitted. The terms expressing position and direction described in the embodiments of this utility model are illustrative based on the accompanying drawings, but changes can be made as needed, and all such changes are included within the protection scope of this utility model. The accompanying drawings of the embodiments of this utility model are only for illustrating relative positional relationships and do not represent actual proportions.

[0023] It should be noted that specific details are set forth in the following description to facilitate understanding of this utility model. However, this utility model can be implemented in many ways other than those described herein, and those skilled in the art can make similar extensions without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0024] In wireless communication devices, slot antennas, as planar structures, perfectly meet the development trends and requirements of modern wireless communication systems, thus the demand for slot antennas is increasing daily. However, traditional slot antennas have relatively narrow bandwidths, therefore, they can only meet the needs of use within a relatively small frequency range, which leads to relatively poor adaptability of slot antennas to different products.

[0025] Therefore, the question is how to broaden the bandwidth of slot antennas to improve their adaptability to different products.

[0026] In view of this, the slot antenna device provided by this utility model, by adding a variable capacitance device to the antenna trace of the slot antenna to extend the electrical length, thereby widening the bandwidth of the antenna. To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] refer to Figure 1 , Figure 1 This is a schematic diagram of a slot antenna device provided by the present invention. The slot antenna device includes a plate structure 1, a variable capacitance device 2, and a voltage converter ( Figure 1 (not shown in the image), and the plate structure 1 is electrically connected to the variable capacity device 2.

[0028] In the specific configuration of plate structure 1, plate structure 1 includes a first elongated hole 11 and a power supply point 12. For example... Figure 2 As shown, Figure 2 For display Figure 1 Along the sectional view of AA, along the thickness direction of plate structure 1 ( Figure 2 (As shown in the Z direction), the first elongated hole 11 penetrates the plate surface 13 of the plate structure 1. It can be understood that the plate structure 1 includes two plate surfaces 13 arranged opposite each other, and the two plate surfaces 13 are arranged opposite each other along the Z direction, and the distance between the two plate surfaces 13 is the thickness of the plate structure 1.

[0029] Continue to refer to Figure 1 The feed point 12 is located on one of the plate surfaces 13 of the plate structure 1, and along the width direction of the first elongated hole 11, the feed point 12 is located on one side of the first elongated hole 11, and the feed point 12 is electrically connected to the power module to introduce radio frequency signals into the antenna device, thereby exciting the antenna device to radiate electromagnetic waves.

[0030] In the specific configuration of the variable capacitance device 2, it is spaced apart from the feed point 12 along the length of the first elongated hole 11, and is electrically connected to the plate structure 1. The variable capacitance device 2 is exemplarily a variable capacitor, and along the width of the first elongated hole 11, one contact of the variable capacitor is electrically connected to one side of the first elongated hole 11, and the other contact is electrically connected to the other side of the first elongated hole 11, so as to change the overall capacitance value of the antenna device. Furthermore, the specifications of the variable capacitor can be adjusted according to actual needs; for example, the capacitance value range of the variable capacitor can be 0.61pF~3.2pF, or 1.2pF~1.8pF. The voltage converter is electrically connected to the variable capacitance device 2, i.e., the voltage converter is electrically connected to the variable capacitor, to change the capacitance value of the variable capacitance device 2. The voltage converter can be exemplarily a DC-DC converter.

[0031] Using the slot antenna device provided by this utility model, when the base station or workstation sends frequency band information of different signal strengths to the antenna, the voltage value of the voltage converter can be changed to change the capacitance value of the variable capacitance device 2, thereby changing the overall capacitance value of the antenna device. This causes the low-frequency resonance of the antenna device to shift, which can effectively broaden the bandwidth of the antenna device and improve the adaptability of the slot antenna device to different frequency band information.

[0032] In one specific embodiment, continue to refer to Figure 1 Along the length direction of the first elongated hole 11, the variable displacement device 2 is located at one end of the first elongated hole 11, and along the length direction of the first elongated hole 11, the center of the first elongated hole 11 (e.g.) Figure 1 Point M (as shown) is located between the variable capacitance device 2 and the feed point 12. This allows the variable capacitance device 2 to provide only a small capacitance value, resulting in a significant shift in the low-frequency resonance and thus widening the bandwidth of the antenna device. Furthermore, spacing the feed point 12 from point M reduces radiation loss and improves radiation efficiency. Additionally, the offset feed point 12 from point M makes the antenna's radiation pattern more regular, effectively improving the quality of the received signal.

[0033] It should be noted that the shape of the first elongated hole 11 on the plate surface 13 of the plate structure 1 can be adjusted according to practical installation requirements and bandwidth requirements. In an optional embodiment, the first elongated hole 11 can be as follows: Figure 3 The shape shown. Alternatively, the first elongated hole 11 can also be as shown... Figure 1The shape shown, specifically, the first elongated hole 11 includes a first sidewall 111 and a second sidewall 112, and both the first sidewall 111 and the second sidewall 112 are located on the rectangular sidewalls of the first elongated hole 11. Furthermore, the first sidewall 111 and the second sidewall 112 intersect, and the included angle between the first sidewall 111 and the second sidewall 112 is α, where α satisfies: 0° < α < 180°. For example, as... Figure 1 As shown, the included angle α = 90°, that is, on the plate surface 13 of the plate structure 1, the long side of the first sidewall 111 is perpendicular to the long side of the second sidewall 112, so as to meet the bandwidth requirements of the frequency band information received by the antenna device, as well as the installation requirements of different electronic devices.

[0034] Furthermore, the length of the first elongated hole 11 (i.e., the sum of the length of the long side of the first sidewall 111 and the length of the long side of the second sidewall 112) and the width of the first elongated hole 11 can also be adjusted according to actual needs. For example, the length of the first elongated hole 11 is A, and A satisfies: 150mm≤A≤170mm. The width of the first elongated hole 11 is B, and B satisfies: 2mm≤B≤3mm.

[0035] Furthermore, along the long side of the first elongated hole 11, the distance from the feed point 12 to the variable capacitance device 2 is N, and N satisfies: 28mm ≤ N ≤ 32mm. It should be noted that, as... Figure 1 As shown, the feed point 12 is close to the second side wall 112 relative to the first side wall 111, and the distance from the feed point 12 along the long side of the second side wall 112 to the connection point of the first side wall 111 and the second side wall 112 is n, and the length of the long side of the first side wall 111 is m, N=m+n.

[0036] Furthermore, this utility model does not limit the outer contour of the plate structure 1, such as... Figure 1 As shown, exemplarily, the plate structure 1 further includes a first bend and a second bend, with a first sidewall 111 located at the first bend and a second sidewall 112 located at the second bend. The first bend and the second bend intersect, and the angle between them is β, where β satisfies α = β. This allows for meeting the bandwidth requirements of the slot antenna while reducing the manufacturing cost of the plate structure 1.

[0037] In one specific embodiment, when the above-described antenna device is applied to an electronic device, such as Figure 4 As shown, the electronic device specifically includes a motherboard 01 and a display screen 02, wherein, along the thickness direction of the board structure 1 (i.e., as shown in the figure), Figure 2(As shown in the Z direction), board structure 1 is located between motherboard 01 and display screen 02. Motherboard 01 includes a tuning network circuit, which is electrically connected to feed point 12 on board structure 1 via radio frequency line 3. The tuning network circuit is exemplarily a two-dimensional π-type matching tuning network circuit or a T-type matching tuning network.

[0038] When specifically connecting the motherboard 01 and board structure 1, such as Figure 1 As shown, the board structure 1 includes a grounding point 14, which is located on the same side of the board surface 13 as the feed point 12. Along the width direction of the first elongated hole 11, the grounding point 14 and the feed point 12 are opposite each other. Specifically, the grounding point 14 and the feed point 12 are located on opposite sides of the first elongated hole 11. Simultaneously, the grounding layer of the RF line 3 is electrically connected to the grounding point 14, and the feed layer of the RF line 3 is electrically connected to the feed point 12.

[0039] In addition, along the thickness direction of the plate structure 1, the projection of the first elongated hole 11 of the plate structure 1 onto the extended surface of the display screen 02 is located outside the edge of the display screen 02. This can reduce the shielding risk of the display screen 02 to electromagnetic waves and is beneficial to improving the electromagnetic wave transmission efficiency of the slot antenna device.

[0040] In one alternative implementation, such as Figure 4 As shown, the electronic device also includes a mounting part 03. Along the thickness direction of the plate structure 1, the mounting part 03 is located between the plate structure 1 and the display screen 02. The display screen 02 is fixedly connected to the plate structure 1 through the mounting part 03 to improve the reliability of the electronic device.

[0041] Furthermore, the plate structure 1 is electrically connected to the mounting part 03. In the specific arrangement of the mounting part 03, the mounting part 03 includes a second elongated hole 031, and along the thickness direction of the plate structure 1, the projection of the first elongated hole 11 onto the mounting part 03 is located within the edge of the second elongated hole 031. This effectively reduces the shielding risk of the mounting part 03 to electromagnetic waves, which is beneficial for improving the electromagnetic wave transmission efficiency of the slot antenna device.

[0042] It is understood that the electronic devices using this utility model are not limited to 2.4G WIFI, 2.4G WIFI + 5G WIFI, BT, 4G, 5G, subG, etc., as referenced. Figure 5 , Figure 5 For display Figure 4Test data for the provided electronic device. Curve P represents the test curve of the capacitance value of the variable capacitance device 2 in its initial state, and curve F represents the test curve after the capacitance value of the variable capacitance device 2 increases. It can be seen that when the capacitance value of the variable capacitance device 2 increases, the low-frequency resonance shifts significantly. The requirement is that, using the electronic device provided by this utility model, since the capacitance value of the antenna device can be changed, and along the thickness direction of the plate structure 1, the projection of the first elongated hole 11 on the mounting part 03 is located within the edge of the second elongated hole 031, thus effectively reducing the shielding risk of the mounting part 03 on the electromagnetic waves received by the slot antenna device, even if the mounting part 03 is made of metal.

[0043] In addition, conductive adhesive is filled between the plate surface 13 of the plate structure 1 and the plate surface of the metal mounting part 03 to improve the reliability of the connection between the plate structure 1 and the mounting part 03.

[0044] It is worth mentioning that in the electronic device provided by this utility model, the capacitance value of the variable capacitance device 2 of the antenna device can be adjusted manually or by the control circuit. For example, when the capacitance value of the variable capacitance device 2 is adjusted by the control circuit, firstly, the slot antenna device receives the frequency band information sent by the base station or workstation. The control circuit changes the DC-DC output voltage according to whether the signal strength of the received frequency band information is at a set threshold. Then, the capacitance value of the output of the variable capacitance device 2 changes with the change of the input voltage, so that the low-frequency resonance of the slot antenna device is shifted.

[0045] In summary, the slot antenna device provided by this utility model can change the overall capacitance value of the antenna device by changing the capacitance value of the variable capacitance device 2 when the base station or workstation sends frequency band information of different signal strengths to the antenna. This causes the low-frequency resonance of the antenna device to shift, which can effectively broaden the bandwidth of the antenna device and improve the adaptability of the slot antenna device to different frequency band information.

[0046] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A slot antenna device, characterized in that, It includes a plate structure (1), a variable capacity device (2), and a voltage converter, wherein: The plate structure (1) includes a first elongated hole (11) and a power supply point (12). Along the thickness direction of the plate structure (1), the first elongated hole (11) penetrates the plate surface (13) of the plate structure (1). The power supply point (12) is located on the plate surface (13) of the plate structure (1) and along the width direction of the first elongated hole (11), the power supply point (12) is located on one side of the first elongated hole (11); Along the length direction of the first elongated hole (11), the variable capacity device (2) is spaced apart from the power supply point (12) and electrically connected to the plate structure (1); The voltage converter is electrically connected to the variable capacitance device (2) and is used to change the capacitance value of the variable capacitance device (2).

2. The slot antenna device according to claim 1, characterized in that, Along the length of the first elongated hole (11), the variable capacity device (2) is located at one end of the first elongated hole (11), and the center of the first elongated hole (11) is located between the variable capacity device (2) and the power supply point (12).

3. The slot antenna device according to claim 1, characterized in that, The first elongated hole (11) includes a first sidewall (111) and a second sidewall (112), and the first sidewall (111) and the second sidewall (112) intersect; the included angle between the first sidewall (111) and the second sidewall (112) is α, and α satisfies: 0°<α<180°.

4. The slot antenna device according to claim 3, characterized in that, The length of the first elongated hole (11) is A, and A satisfies: 150mm≤A≤170mm.

5. The slot antenna device according to claim 3, characterized in that, The width of the first elongated hole (11) is B, and B satisfies: 2mm≤B≤3mm.

6. The slot antenna device according to claim 1, characterized in that, The variable capacitance device (2) is a variable capacitor. Along the width direction of the first elongated hole (11), one contact of the variable capacitor is electrically connected to one side of the first elongated hole (11), and the other contact of the variable capacitor is electrically connected to the other side of the first elongated hole (11).

7. An electronic device, characterized in that, Includes a motherboard (01), a display screen (02), and a slot antenna device as described in any one of claims 1-6, wherein: Along the thickness direction of the plate structure (1), the plate structure (1) is located between the motherboard (01) and the display screen (02), and the plate structure (1) is electrically connected to both the motherboard (01) and the display screen (02); Along the thickness direction of the plate structure (1), the projection of the first elongated hole (11) on the extension surface of the display screen (02) is located outside the edge of the display screen (02).

8. The electronic device according to claim 7, characterized in that, The electronic device further includes a mounting part (03), which is located between the plate structure (1) and the display screen (02) along the thickness direction of the plate structure (1), and the plate structure (1) is electrically connected to the mounting part (03); The mounting portion (03) includes a second elongated hole (031), and along the thickness direction of the plate structure (1), the projection of the first elongated hole (11) on the mounting portion (03) is located within the edge of the second elongated hole (031).

9. The electronic device according to claim 8, characterized in that, The mounting part (03) is made of metal, and conductive adhesive is filled between the plate structure (1) and the mounting part (03).

10. The electronic device according to claim 7, characterized in that, The motherboard (01) includes a tuning network circuit that is electrically connected to the power supply point (12).

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