A cavity WiFi antenna for notebook computers

Abstract

The present invention provides a cavity WiFi antenna for use in laptop computers, which is applied to the field of mobile communications technology and includes a dielectric substrate, an upper radiating unit, a lower radiating unit, and a cavity. The upper and lower radiating units are respectively disposed on the upper and lower surfaces of the dielectric substrate and are electrically connected to each other. The cavity is disposed below the dielectric substrate, forming a cavity between the cavity and the dielectric substrate, which is used for directional radiation of the antenna and for shielding electromagnetic interference from within the laptop computer. This cavity WiFi antenna for use in laptop computers, through the structural design of the dielectric substrate and the cavity, achieves directional radiation while shielding electromagnetic interference from within the laptop computer.

Description

Technical Field

[0001] The present invention belongs to the technical field of mobile communications, and in particular relates to a cavity WiFi antenna applied to a notebook computer. Background Art

[0002] Wireless local area network (WLAN) technology is the most fundamental communication method for laptops. With the increasing popularity of the next-generation WLAN technology, WiFi7, laptop WiFi antennas must operate simultaneously in the 2GHz, 5GHz, and 6GHz frequency bands. To enhance the structural robustness and aesthetic appeal of their products, laptop manufacturers are pursuing extensive metallization of their laptop casings. This extensive metal coating inevitably impacts the performance of the antennas built into the laptops, placing higher demands on antenna development.

[0003] To address this issue, some manufacturers have created slot antennas by creating slits in metal casings. However, slot antennas have a narrow bandwidth and are difficult to achieve impedance matching, failing to meet the requirements of the WiFi 7 frequency band. Other manufacturers use nano-injection molding to create a non-metallic clearance in the antenna area, while still using conventional Pifa antennas. This approach has the disadvantage that the antenna requires conductive fabric or copper foil to share a common ground with the laptop. Furthermore, because the antenna radiates omnidirectionally, it is susceptible to electromagnetic interference from the laptop's internal motherboard and battery, affecting communication quality.

[0004] The last solution is the current mainstream and better-performing cavity antenna solution, such as the composite wide-band high-precision positioning combination antenna disclosed in the Chinese invention patent with publication number CN117276869A, and the cavity antenna, laptop computer and terminal disclosed in the Chinese invention patent with publication number CN118198734A. The above patents mention that resonance is formed by constructing a cavity inside the laptop computer, and then slits are opened on the metal shell to radiate energy. However, this solution is relatively complicated in terms of process and requires the embedding of metal bodies, coupling parts and other structures. In addition, the volume of the cavity of this solution is large, which is difficult to apply when the internal device layout of the laptop computer is compact. Summary of the Invention

[0005] In view of the above problems in the prior art, the purpose of the present invention is to provide a cavity WiFi antenna for use in laptop computers. Through the structural design of the dielectric substrate and the cavity, the antenna can achieve directional radiation while shielding electromagnetic wave interference inside the laptop computer.

[0006] A cavity WiFi antenna for a laptop computer comprises a dielectric substrate, an upper radiating unit, a lower radiating unit, and a cavity. The upper radiating unit and the lower radiating unit are respectively arranged on the upper and lower surfaces of the dielectric substrate and are electrically connected to each other. The cavity is arranged below the dielectric substrate, forming a cavity between the cavity and the dielectric substrate for directional radiation of the antenna and for shielding electromagnetic wave interference inside the laptop computer.

[0007] Preferably, the upper radiation unit includes a low-frequency radiation branch, and the low-frequency radiation branch includes a rectangular radiation block, an upper radiation strip and a lower radiation strip;

[0008] A groove is provided on one side of the rectangular radiation block, and the two ends of the side of the rectangular radiation block with the groove are respectively connected to an upper radiation strip and a lower radiation strip that are relatively distributed;

[0009] An "n"-shaped low-frequency radiation branch is formed by the rectangular radiation block, the upper radiation strip and the lower radiation strip.

[0010] Preferably, the lengths of the upper and lower radiant strips are different so that the upper and lower radiant strips respectively form a low-frequency resonance, and the two low-frequency resonances are combined to form a new low-frequency resonance for widening the low-frequency bandwidth of the antenna.

[0011] Preferably, the upper radiation unit also includes a high-frequency radiation slot and a high-frequency radiation branch one. A high-frequency radiation slot is provided at a position of the rectangular radiation block close to the lower radiation strip. The high-frequency radiation branch one is "L"-shaped. One end of the lower radiation strip close to the rectangular radiation block is electrically connected to the high-frequency radiation branch one.

[0012] Preferably, the total length of the low-frequency radiation branch is half the dielectric wavelength corresponding to 2.4 GHz, forming a half-wave dipole structure; the total length of the high-frequency radiation slot is half the dielectric wavelength corresponding to 5.75 GHz, so that the high-frequency radiation slot forms a high-frequency resonance at 5.75 GHz; the total length of the high-frequency radiation branch one is one-quarter the dielectric wavelength corresponding to 5.9 GHz, so that the high-frequency radiation branch one forms a high-frequency resonance at 5.9 GHz.

[0013] Preferably, a high-frequency coupling branch is also configured on the dielectric substrate, and the high-frequency coupling branch is electrically connected to the cavity, and the high-frequency coupling branch is located next to the upper radiation unit; the high-frequency coupling branch includes high-frequency coupling branch one and high-frequency coupling branch two, and the high-frequency coupling branch one and high-frequency coupling branch two are orthogonally connected; the total length of the high-frequency coupling branch one and the high-frequency coupling branch two is one-quarter of the dielectric wavelength corresponding to 5.3 GHz, so that the high-frequency coupling branch forms a high-frequency resonance at 5.3 GHz.

[0014] Preferably, the dielectric substrate is provided with metal through holes for exciting the upper radiation unit and the high-frequency coupling branches.

[0015] Preferably, the lower radiation unit includes a high-frequency radiation branch node 2 and a high-frequency radiation branch node 3, the high-frequency radiation branch node 2 is in an "L" shape, and the high-frequency radiation branch node 3 is composed of two rectangular blocks with aligned center lines on the left and right. The high-frequency radiation branch node 2 and the high-frequency radiation branch node 3 are excited by a feeding structure, and the feeding structure is located at the bottom center of the dielectric substrate.

[0016] Preferably, the length of the high-frequency radiation branch two is one-quarter of the dielectric wavelength corresponding to 6.3GHz, so that the high-frequency radiation branch two forms a high-frequency resonance at 6.3GHz; the total length of the high-frequency radiation branch three is one-quarter of the dielectric wavelength corresponding to 6.75GHz, so that the high-frequency radiation branch three forms a high-frequency resonance at 6.75GHz.

[0017] Preferably, the cavity includes a front, a back, a left, a right and a bottom. The front, the back, the left, the right and the bottom of the cavity are all metal bodies. The top of the cavity is a hollow structure for mounting a dielectric substrate. The front and the back of the cavity are both provided with hollow grooves for adjusting the low-frequency 2.4 GHz impedance matching.

[0018] The beneficial effects of the present invention are as follows: the cavity WiFi antenna applied to a laptop computer has an upper radiation unit and a lower radiation unit arranged on a dielectric substrate, and adopts a double-sided routing form to increase the routing area of ​​the antenna, thereby reducing the size of the antenna and meeting the use requirements of the small space of the laptop computer.

[0019] The cavity structure, formed by the structural design of the dielectric substrate and cavity, enables directional radiation from the antenna while effectively shielding against electromagnetic interference from within the laptop. Furthermore, welding the dielectric substrate and cavity together simplifies the process and ensures consistent antenna performance. Terminal manufacturers secure the cavity antenna to the laptop's C or D case using screws, making assembly simple.

[0020] Furthermore, the upper and lower radiating strips in the upper radiating element are of different lengths, each forming a low-frequency radiation. These two low-frequency resonances are then combined to form a wider low-frequency resonance, effectively broadening the antenna's low-frequency bandwidth. Furthermore, through the design of high-frequency radiation slots, high-frequency radiation branches 1, 2, 3, and high-frequency coupling branches, multiple resonance points are established at the antenna's high-frequency position, effectively broadening the antenna's high-frequency bandwidth. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0022] Figure 1 It is a structural schematic diagram of the present invention;

[0023] Figure 2 is an exploded view of the present invention;

[0024] Figure 3 It is a structural schematic diagram of the upper plane of the dielectric substrate of the present invention;

[0025] Figure 4 This is a schematic diagram of the plane dimensions of the upper layer of the dielectric substrate of the present invention;

[0026] Figure 5 It is a structural schematic diagram of the lower plane of the dielectric substrate of the present invention;

[0027] Figure 6 This is a schematic diagram of the planar dimensions of the lower layer of the dielectric substrate of the present invention;

[0028] Figure 7 It is a structural schematic diagram of the cavity of the present invention;

[0029] Figure 8 This is a schematic structural diagram of the antenna of the present invention installed inside a laptop computer;

[0030] Figure 9 is a Return Loss simulation curve diagram of the antenna of the present invention;

[0031] Figure 10 is the 3D radiation pattern of the antenna of the present invention at 2.45 GHz;

[0032] Figure 11 is the 3D radiation pattern of the antenna of the present invention at 5.5 GHz;

[0033] Figure 12 3D radiation pattern of the antenna of the present invention at 6.5 GHz.

[0034] The markings in the figure are: 1. Dielectric substrate; 2. Upper radiation unit; 21. Low-frequency radiation branch; 22. High-frequency radiation slot; 23. High-frequency radiation branch one; 3. Lower radiation unit; 31. High-frequency radiation branch two; 32. High-frequency radiation branch three; 4. Metal through hole; 5. High-frequency coupling branch; 51. High-frequency coupling branch one; 52. High-frequency coupling branch two; 6. Feeding structure; 7. Cavity; 8. Hollow slot; 9. Connection structure; 91. Connector one; 92. Connector two; 10. Fixing point. DETAILED DESCRIPTION

[0035] Example 1

[0036] like Figure 1 、 Figure 2 As shown, a cavity WiFi antenna for a laptop computer includes a dielectric substrate 1, an upper radiation unit 2, a lower radiation unit 3, a metal through-hole 4, a high-frequency coupling branch 5, a feeding structure 6, a cavity 7, a cavity hollow groove 8, a connection structure 9 and a fixing point 10.

[0037] The dielectric substrate 1 is made of a conventional FR-4 board. On one hand, the upper plane of the dielectric substrate 1 is printed with an upper radiation unit 2 and a high-frequency coupling branch 5.

[0038] like Figure 3 As shown, the upper radiation unit 2 includes a low-frequency radiation branch 21, a high-frequency radiation slot 22 and a high-frequency radiation branch 1 23. The low-frequency radiation branch 21 includes a rectangular radiation block 210, an upper radiation strip 211 and a lower radiation strip 212.

[0039] Specifically, a groove is provided at one end of the rectangular radiation block 210, and the two ends of one side of the rectangular radiation block 210 having the groove are respectively connected to relatively distributed upper radiation strips 211 and lower radiation strips 212, wherein an "n"-shaped low-frequency radiation branch 21 is formed through the spatial layout of the rectangular radiation block 210, the upper radiation strip 211, and the lower radiation strip 212.

[0040] It should be noted that the lengths of the upper radiating strip 211 and the lower radiating strip 212 are set to be different so that the upper radiating strip 211 and the lower radiating strip 212 can respectively construct a low-frequency resonance near the frequency of 2.4 GHz. The two low-frequency resonances are combined to form a new low-frequency resonance to increase the low-frequency bandwidth of the antenna.

[0041] The total length of the low-frequency radiation branch 21 is about half the wavelength of the medium corresponding to 2.4 GHz, forming a half-wave dipole mode.

[0042] Please refer to Figure 4 The rectangular radiating block 210 has a length L10 of 28 to 34 mm and a width W10 of 3.8 to 4.4 mm, preferably 31 mm and 4.1 mm. The upper radiating strip 211 has a length L11 of 18 to 18.8 mm, preferably 18.8 mm. The lower radiating strip 212 has a length L12 of 22 to 22.8 mm, with L12 being 22.8 mm.

[0043] Furthermore, a high-frequency radiation slot 22 is provided near the lower radiation strip 212 of the rectangular radiation block 210. The total length of the high-frequency radiation slot 22 is about half the wavelength of the medium corresponding to 5.75 GHz, so that the high-frequency radiation slot 22 forms a high-frequency resonance at a high frequency of 5.75 GHz. Figure 4 The length of the high-frequency radiation slot 22 is L20 = 18.1 ~ 18.9 mm, preferably L20 = 18.5 mm.

[0044] The high-frequency radiation branch 23 is L-shaped, and the end of the lower radiation strip 212 close to the rectangular radiation block 210 is electrically connected to the high-frequency radiation branch 23. The total length of the high-frequency radiation branch 23 is about one-quarter of the dielectric wavelength corresponding to 5.9GHz, so that the high-frequency radiation branch 23 forms a high-frequency resonance at a high frequency of 5.9GHz. For details, please refer to Figure 4 The length of the high-frequency radiation branch 23 is L21 = 8.5 ~ 9.1 mm, preferably L21 = 8.8 mm.

[0045] like Figure 3 As shown, the high-frequency coupling branch 5 is disposed beside the upper radiation unit 2. Specifically, the high-frequency coupling branch 5 is located on the left side of the low-frequency radiation branch 21. The high-frequency coupling branch 5 is electrically connected to the cavity 7.

[0046] Furthermore, the high-frequency coupling branch 5 includes a high-frequency coupling branch 1 51 and a high-frequency coupling branch 2 52, and the high-frequency coupling branch 1 51 and the high-frequency coupling branch 2 52 are orthogonally connected. The orthogonal structure of the high-frequency coupling branch 5 formed by the orthogonal connection of the high-frequency coupling branch 1 51 and the high-frequency coupling branch 2 52 can increase the coupling range.

[0047] Specifically, such as Figure 3 As shown, the high-frequency coupling branch 1 51 couples upward along the positive direction of the Y axis of the dielectric substrate 1 , and the high-frequency coupling branch 2 52 couples rightward along the positive direction of the X axis of the dielectric substrate 1 .

[0048] The total length of the high-frequency coupling branch 1 51 and the high-frequency coupling branch 2 52 is about one-quarter of the medium wavelength corresponding to 5.3 GHz, so that the high-frequency coupling branch 5 can form a high-frequency resonance at 5.3 GHz. Figure 4 The length of the high-frequency coupling branch 51 is L22 = 6.5 ~ 7.1 mm, preferably L22 = 6.8 mm; the length of the high-frequency coupling branch 52 is L23 = 3.3 ~ 4.1 mm, preferably L23 = 3.8 mm.

[0049] It is important to note that dielectric substrate 1 is provided with metal vias 4 for energizing upper radiating elements 2 and high-frequency coupling branches 5. Furthermore, upper radiating elements 2 and lower radiating elements 3 are electrically connected via metal vias 4. By providing upper radiating elements 2 and lower radiating elements 3 on the upper and lower surfaces of dielectric substrate 1, respectively, double-sided printing of the circuit is achieved, increasing the antenna's routing area and reducing its size.

[0050] On the other hand, the lower layer radiation unit 3 is printed on the lower plane of the dielectric substrate 1 , and the upper layer radiation unit 2 is electrically connected to the lower layer radiation unit 3 .

[0051] like Figure 5 As shown, the lower radiation unit 3 includes a high-frequency radiation branch 2 31 and a high-frequency radiation branch 32. Among them, the high-frequency radiation branch 2 31 is "L" shaped, and its length is about a quarter of the medium wavelength corresponding to 6.3GHz, so that the high-frequency radiation branch 2 31 can form a high-frequency resonance at 6.3GHz. For details, please refer to Figure 6 The total length L24 of the high-frequency radiation branch 2 31 is 7.2-8.0 mm, preferably L24 = 7.6 mm.

[0052] The high-frequency radiation branch 32 is composed of two rectangular blocks with aligned center lines, and the length and width of the left rectangular block are smaller than the right rectangular block. The total length of the high-frequency radiation branch 32 is about one-quarter of the medium wavelength corresponding to 6.75GHz, so that the high-frequency radiation branch 32 can form a high-frequency resonance at 6.75GHz. For details, please refer to Figure 6 The total length L25 of the high-frequency radiation branch 32 is 6.1-6.9 mm, preferably L10 is 6.5 mm.

[0053] The high-frequency radiation branch 2 31 and the high-frequency radiation branch 3 32 of the lower radiation unit 3 are excited by the feeding structure 6, which is located at the bottom center of the dielectric substrate 1. The feeding structure 6 can be a coaxial cable, which is passed through a hole in the cavity 7 to connect the feeding structure 6 to the laptop motherboard.

[0054] like Figure 7 As shown, the cavity 7 is a rectangular pentahedron structure, and the cavity 7 includes a front surface 71, a rear surface 72, a left surface 73, a right surface 74 and a bottom surface 75. The front surface 71, the rear surface 72, the left surface 73, the right surface 74 and the bottom surface 75 are all metal bodies, and the top is a hollow structure for mounting the dielectric substrate 1.

[0055] In addition, a 1 mm wide hollow groove 8 is provided on the front 71 and the rear 72 of the cavity 7 , respectively. The hollow groove 8 is used to adjust the low-frequency 2.4G impedance matching.

[0056] Further, such as Figure 7As shown, a connection structure 9 is configured on the cavity 7, and the connection structure 9 includes a connector 1 91 and a connector 2 92. Connector 1 91 is located at the top corner of the cavity 7. Correspondingly, a fixing point 10 is provided at the corner of the dielectric substrate 1. Connector 1 91 is connected to the fixing point 10, thereby connecting the dielectric substrate 1 to the cavity 7. The fixing point 10 only plays a fixing role and does not participate in radiation. The cavity antenna with an integrated structure formed by welding the dielectric substrate 1 to the cavity 7 has a simple process and good antenna performance consistency. The metal cavity structure of the antenna can achieve directional radiation, while effectively shielding the interference of electromagnetic waves inside the laptop computer, thereby improving the antenna's anti-interference ability.

[0057] The second connector 92 is connected to the high-frequency coupling branch 5, so that the high-frequency coupling branch 5 is electrically connected to the cavity 7. In this embodiment, the second connector 92 and the high-frequency coupling branch 5 are welded.

[0058] The return loss curve of the antenna simulation in this embodiment is as follows: Figure 9 As shown, according to Figure 9 It can be seen from the mark points 1 and 2 that the return loss of the antenna is below -10dB in the frequency range of 2.4-2.485GHz. Figure 9 As can be seen from points 3, 4, 5, and 6, the antenna's return loss is below -7.5 dB in the 5.15-7.3 GHz frequency range. Therefore, the antenna has good impedance matching.

[0059] Specifically, such as Figure 9 As shown, a low-frequency resonance point is formed between mark point 1 and mark point 2, and the low-frequency resonance point is formed by the low-frequency radiation branch 21. Six high-frequency resonances are formed between mark point 3 and mark point 4, among which the first high-frequency resonance point is formed by the high-frequency coupling branch 5, the second high-frequency resonance point is formed by the high-frequency radiation slot 22, the third high-frequency resonance point is formed by the high-frequency radiation branch 1 23, the fourth high-frequency resonance point is formed by the high-frequency radiation branch 2 31, the fifth high-frequency resonance point is formed by the high-frequency radiation branch 3 32, and the sixth high-frequency resonance point is three times the low-frequency resonance.

[0060] like Figure 8 As shown, the cavity WiFi antenna is placed in the lower left corner of the laptop computer and the cavity 7 is fixed to the laptop computer's C-shell using screws. Furthermore, another cavity WiFi antenna can be installed in the lower right corner of the laptop computer, so that the antennas on the left and right sides form a set of primary and secondary antennas. The primary and secondary antennas are arranged in a mirrored manner.

[0061] As can be seen from the enlarged image of the antenna area, an "n"-shaped non-metallic clearance 110 is set in the antenna area on the side of the laptop. The non-metallic clearance 110 consists of a side 1101 and an upper and lower edge 1102. The length and width of the side 1101 are consistent with the dielectric substrate 1; the length of the upper and lower edges 1102 are consistent with the dielectric substrate 1 and the width is 1mm. Among them, the non-metallic clearance 110 can be made into an integrated structure with the laptop C shell or D shell through a nano-injection molding process without affecting the appearance.

[0062] Since the laptop WiFi antenna needs to operate in the 2 GHz / 5 GHz / 6 GHz frequency bands simultaneously, and the frequency range of the 2 GHz band is 2.4-2.485 GHz, the frequency range of the 5 GHz band is 5.15-5.85 GHz, and the frequency range of the 6 GHz band is 5.925-7.125 GHz, the center frequencies of the 2 GHz / 5 GHz / 6 GHz bands are selected as the base values ​​for 3D radiation simulation.

[0063] The 3D radiation pattern of the antenna at 2.45 GHz in this embodiment is as follows: Figure 10 As shown, the 3D radiation pattern of the antenna at 5.5 GHz in this embodiment is as follows Figure 11 As shown, the 3D radiation pattern of the antenna at 6.5 GHz in this embodiment is as follows Figure 12 As shown. Figure 10-12 As shown, the antenna radiates directionally toward the left hemisphere of the laptop computer, and therefore is not easily interfered by electromagnetic waves inside the laptop computer.

[0064] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A cavity WiFi antenna for a notebook computer, characterized in that: It comprises a dielectric substrate (1), an upper radiation unit (2), a lower radiation unit (3) and a cavity (7); The upper radiation unit (2) and the lower radiation unit (3) are respectively arranged on the upper surface and the lower surface of the dielectric substrate (1), and the upper radiation unit (2) and the lower radiation unit (3) are electrically connected; The cavity (7) is arranged below the dielectric substrate (1), and a cavity is formed between the cavity (7) and the dielectric substrate (1), which is used for directional radiation of the antenna and for shielding electromagnetic wave interference inside the laptop computer; The upper radiation unit (2) comprises a low-frequency radiation branch (21), and the low-frequency radiation branch (21) comprises a rectangular radiation block (210), an upper radiation strip (211), and a lower radiation strip (212); A groove is provided on one side of the rectangular radiation block (210), and oppositely distributed upper radiation strips (211) and lower radiation strips (212) are respectively connected to two ends of the side of the rectangular radiation block (210) having the groove. An "n"-shaped low-frequency radiation branch (21) is formed by the rectangular radiation block (210), the upper radiation strip (211), and the lower radiation strip (212); The lengths of the upper radiating strip (211) and the lower radiating strip (212) are set to be different, so that the upper radiating strip (211) and the lower radiating strip (212) respectively form a low-frequency resonance, and the two low-frequency resonances are combined to form a new low-frequency resonance, which is used to broaden the low-frequency bandwidth of the antenna; The lower layer radiation unit (3) includes a high-frequency radiation branch node 2 (31) and a high-frequency radiation branch node 3 (32), wherein the high-frequency radiation branch node 2 (31) is in an "L" shape, and the high-frequency radiation branch node 3 (32) is formed by connecting two rectangular blocks with aligned center lines on the left and right sides. The high-frequency radiation branch node 2 (31) and the high-frequency radiation branch node 3 (32) are excited by a feeding structure (6), and the feeding structure (6) is located at the bottom center of the dielectric substrate (1).

2. The cavity WiFi antenna for notebook computers according to claim 1, characterized in that: The upper radiation unit (2) further comprises a high-frequency radiation slot (22) and a high-frequency radiation branch (23); the rectangular radiation block (210) is provided with a high-frequency radiation slot (22) at a position close to the lower radiation strip (212); the high-frequency radiation branch (23) is L-shaped; and one end of the lower radiation strip (212) close to the rectangular radiation block (210) is electrically connected to the high-frequency radiation branch (23).

3. The cavity WiFi antenna for notebook computers according to claim 2, characterized in that: The total length of the low-frequency radiation branch (21) is half the wavelength of the medium corresponding to 2.4 GHz, forming a half-wave dipole structure; The total length of the high-frequency radiation slot (22) is half the wavelength of the medium corresponding to 5.75 GHz, so that the high-frequency radiation slot (22) forms a high-frequency resonance at 5.75 GHz; The total length of the high-frequency radiation branch 1 (23) is one-quarter of the medium wavelength corresponding to 5.9 GHz, so that the high-frequency radiation branch 1 (23) forms a high-frequency resonance at 5.9 GHz.

4. The cavity WiFi antenna for notebook computers according to claim 1, characterized in that: A high-frequency coupling branch (5) is also configured on the dielectric substrate (1), the high-frequency coupling branch (5) is electrically connected to the cavity (7), and the high-frequency coupling branch (5) is located beside the upper radiation unit (2); The high-frequency coupling branch (5) includes a high-frequency coupling branch 1 (51) and a high-frequency coupling branch 2 (52), and the high-frequency coupling branch 1 (51) and the high-frequency coupling branch 2 (52) are orthogonally connected; The total length of the high-frequency coupling branch 1 (51) and the high-frequency coupling branch 2 (52) is one-quarter of the medium wavelength corresponding to 5.3 GHz, so that the high-frequency coupling branch (5) forms a high-frequency resonance at 5.3 GHz.

5. The cavity WiFi antenna for notebook computers according to claim 4, characterized in that: The dielectric substrate (1) is provided with a metal through hole (4) for exciting the upper radiation unit (2) and the high-frequency coupling branch (5).

6. The cavity WiFi antenna for notebook computers according to claim 1, characterized in that: The length of the high-frequency radiation branch 2 (31) is one-quarter of the medium wavelength corresponding to 6.3 GHz, so that the high-frequency radiation branch 2 (31) forms a high-frequency resonance at 6.3 GHz; The total length of the high-frequency radiation branch three (32) is one-quarter of the medium wavelength corresponding to 6.75 GHz, so that the high-frequency radiation branch three (32) forms a high-frequency resonance at 6.75 GHz.

7. The cavity WiFi antenna for notebook computers according to claim 1, characterized in that: The cavity (7) comprises a front surface (71), a rear surface (72), a left surface (73), a right surface (74) and a bottom surface (75); the front surface (71), the rear surface (72), the left surface (73), the right surface (74) and the bottom surface (75) of the cavity (7) are all metal bodies; the top of the cavity (7) is a hollow structure for mounting a dielectric substrate (1); The front (71) and the rear (72) of the cavity (7) are both provided with hollow grooves (8) for adjusting the low-frequency 2.4 GHz impedance matching.

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