Cavity antenna and electronic equipment

Abstract

The utility model provides a cavity antenna and electronic equipment. The cavity antenna comprises a conductive shell and a feed part, a cavity structure is formed in the conductive shell, a first opening is formed in the conductive shell, and the first opening is communicated with the cavity structure; the feed part is arranged on the conductive shell; the circuit board is electrically connected to the conductive shell through the feed part, or the circuit board is coupled to the conductive shell through the feed part; the feed part is any one of a conductive elastic sheet, conductive foam or conductive silica gel; wherein the feeding part, the first opening and the cavity structure jointly form the cavity antenna, and the cavity antenna performs feeding through the feeding part and radiates an electromagnetic wave signal or receives the electromagnetic wave signal through the opening. According to the cavity antenna, the circuit board extends to the cavity structure, the feed part on the circuit board is in contact with the cavity for feeding, and the matching circuit connected with the feed part can perform impedance matching, so that cable materials and related processes can be saved, and the cost is saved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronic equipment, and in particular to a cavity antenna and an electronic device. BACKGROUND

[0002] With the development of science and technology, electronic devices such as tablet computers are widely used in people's daily life. The cavity antenna has the characteristics of low profile and integrability, and can be applied in a full-metal shell product. On the basis of improving product texture, realizing architecture simplification and reducing the thickness of the whole machine, the metal shell is used to construct the cavity antenna, which can realize the miniaturization of the product. Therefore, most of the electronic devices such as tablet computers will adopt the cavity antenna to realize the wireless communication function. The current cavity type is a flexible printed circuit (FPC) wrapped cavity and a steel sheet cavity, and the feeding mode adopts cable welding feeding. However, this feeding mode is limited by process manufacturing, and the feeding consistency is poor, and the impedance matching of the product is difficult. UTILITY MODEL CONTENT

[0003] In view of the above, the present application provides a cavity antenna and an electronic device, which can adjust the impedance matching, increase the high frequency bandwidth, and have higher feeding consistency.

[0004] In the first aspect, the present application provides a cavity antenna applied in an electronic device, which comprises a conductive shell and a feeding part. The cavity structure is formed inside the conductive shell, and a first opening is arranged on the conductive shell and communicates with the cavity structure. The feeding part is arranged on the conductive shell. The circuit board is electrically connected to the conductive shell through the feeding part, or the circuit board is coupled to the conductive shell through the feeding part. The feeding part is any one of a conductive spring, conductive foam or conductive silica gel. The feeding part, the first opening and the cavity structure jointly constitute the cavity antenna. The cavity antenna is fed through the feeding part and radiates or receives electromagnetic wave signals through the first opening.

[0005] The cavity antenna of the present application is fed by extending the circuit board to the cavity structure and contacting the cavity through the feeding part on the circuit board. The feeding part can be connected to the matching circuit for impedance matching, which can save cable materials and related processes and reduce costs.

[0006] As an optional implementation manner, the cavity antenna further comprises a matching circuit electrically connected to the feeding part for impedance matching of the cavity antenna. The feeding part can be connected to the matching circuit to further debug for impedance matching, which can solve the problem of high impedance matching difficulty of the product in the prior art.

[0007] As an optional implementation, the circuit board extends an extension part on the side close to the opening, and the feeding part is electrically connected between the conductive shell and the extension part. Based on this design, the circuit board can be connected to the conductive shell through the extension part and the feeding part.

[0008] As an optional implementation, the conductive shell is an integrally formed structure. In this way, the overall strength of the conductive shell can be ensured.

[0009] As an optional implementation, the conductive shell includes a metal top plate, a metal bottom plate, a first metal end plate, a second metal end plate, and a metal side plate. The first metal end plate is fixedly connected to the first end of the metal bottom plate and the first end of the metal top plate on both sides, respectively. The second metal end plate is fixedly connected to the second end of the metal bottom plate and the second end of the metal top plate on both sides, respectively. The metal side plate is fixedly connected to the first side of the metal bottom plate and the first side of the metal top plate on both sides, respectively. The metal side plate is fixedly connected to the first end of the first metal end plate and the second end of the second metal end plate on both ends, respectively. The metal top plate, the metal bottom plate, the first metal end plate, the second metal end plate, and the metal side plate collectively enclose the cavity structure.

[0010] As an optional implementation, the first opening is arranged on one side of the conductive shell and faces the metal side plate in the first direction. Based on this design, the cavity antenna can radiate electromagnetic wave signals or receive electromagnetic wave signals through the first opening to realize communication with external electronic devices.

[0011] As an optional implementation, the metal top plate extends outwardly from the side away from the metal side plate in the first direction to form a connecting plate, the connecting plate is electrically connected to the metal top plate, and at least a part of the extension part is located below the connecting plate.

[0012] As an optional implementation, the feeding part is arranged between the extension part and the connecting plate. One end of the feeding part is in contact with the connecting plate and electrically connected to the connecting plate. The other end of the feeding part is in contact with the extension part and electrically connected to the extension part.

[0013] As an optional implementation, a second opening is arranged on the second metal end plate and communicates with the cavity structure. The extension part of the circuit board extends into the cavity structure through the second opening. The first end of the feeding part is in contact with the extension part, and the second end of the feeding part is in contact with the metal top plate. Based on this design, the extension part of the circuit board can extend into the cavity structure, and the feeding part can be in contact with the conductive shell, so that the feeding of the cavity antenna can be realized.

[0014] As an optional implementation, a second opening is formed on the second metal end plate, the second opening is in communication with the cavity structure, the extension of the circuit board extends into the cavity structure through the second opening, the first end of the feeding part is in contact with the extension, and the second end of the feeding part is in contact with the metal bottom plate.

[0015] As an optional implementation, the cavity antenna further comprises a suspended stub, the suspended stub is arranged at a position close to the first opening of the conductive shell, the first end of the feeding part is in contact with the extension, the second end of the feeding part is in contact with the suspended stub, and the suspended stub is coupled with the conductive shell. Based on such a design, the circuit board can also feed the cavity antenna in a coupling connection mode.

[0016] In a second aspect, the present application further provides an electronic device, comprising a circuit board, a processor and the cavity antenna as described above, the processor is mounted on the circuit board, and the processor is electrically connected to the circuit board.

[0017] It should be understood that the electronic device provided in the second aspect described above corresponds to the cavity antenna in the first aspect described above, and therefore, the beneficial effects that can be achieved by the electronic device can refer to the beneficial effects of the corresponding cavity antenna provided above, which will not be described herein again. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be considered as limiting the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0019] Figure 1 FIG. 1 is a schematic diagram of a dual-frequency cavity feeding scheme in a flexible circuit board wrapping form.

[0020] Figure 2A FIG. 2 is a schematic diagram of a dual-frequency cavity feeding scheme in a steel sheet form. Figure 2B FIG. 3 is a schematic diagram of a cavity antenna provided by an embodiment of the present application.

[0021] Figure 3 FIG. 4 is a schematic diagram of a cavity antenna provided by an embodiment of the present application.

[0022] Figure 4 FIG. 5 is another schematic diagram of a cavity antenna provided by an embodiment of the present application.

[0023] Figure 5 FIG. 6 is another schematic diagram of a conductive shell provided by an embodiment of the present application.

[0024] Figure 6 FIG. 7 is another schematic diagram of a conductive shell provided by an embodiment of the present application.

[0025] Figure 7 A schematic diagram of a cavity antenna provided for another embodiment of the present application.

[0026] Figure 8 A schematic diagram of a cavity antenna provided for another embodiment of the present application.

[0027] Figure 9 A schematic diagram of a conductive housing provided for another embodiment of the present application.

[0028] Figure 10 A schematic diagram of a cavity antenna provided for another embodiment of the present application.

[0029] Figure 11 A schematic diagram of a cavity antenna provided for another embodiment of the present application.

[0030] Figure 12 A schematic diagram of a SAR sensor connection scheme for a cavity antenna.

[0031] Figure 13 A schematic diagram of a SAR sensor connection scheme employing a cavity antenna of the present application.

[0032] Figure 14 A S11 plot of a cavity antenna of the present application versus a conventional cavity antenna.

[0033] Figure 15 Another S11 plot of a cavity antenna of the present application versus a conventional cavity antenna.

[0034] Figure 16 A radiation efficiency plot of a cavity antenna of the present application versus a conventional cavity antenna.

[0035] Figure 17 A simulation result comparison diagram of antenna performance employing a cavity antenna of the present application. DETAILED DESCRIPTION

[0036] Hereinafter, the terms "first" and "second" are used only for the purpose of description, and should not be construed to indicate or imply relative importance or imply that a certain feature is of a certain number. Thus, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, the words "exemplary", "or", "for example" are used to mean as an example, illustration, or description. Any embodiment or design scheme described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. Rather, the words "exemplary", "or", "for example" are intended to present the relevant concept in a specific manner.

[0037] Reference to an "embodiment" in this application means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. It is expressly understood that that the embodiments described herein are merely examples from among a great variety of embodiments that can be claimed.

[0038] With the continuous development of digital information technology, the speed requirement of core operation processor is higher and higher, and the operation amount is also increasing. Therefore, how to provide high-quality stable power supply output and rich digital adjustment monitoring function for the processor to improve efficiency is the key technology of multi-phase power supply chip.

[0039] Electronic devices such as tablet computers are widely used in people's daily life. The cavity antenna has the characteristics of low profile and integrability, and can be applied in full-metal shell products. On the basis of improving product texture, realizing simple architecture and reducing the thickness of the whole machine, the metal shell is used to construct the cavity antenna, which can realize the miniaturization of the product. Therefore, most of the electronic devices such as tablet computers will adopt the cavity antenna to realize the wireless communication function. The current cavity type is flexible printed circuit (FPC) wrapped cavity and steel sheet cavity.

[0040] As shown in Figure 1 , it is a schematic diagram of a double-frequency cavity 100a in the form of FPC wrapping through cable 101a welding feeding scheme. However, this cable welding feeding will be limited by process manufacturing, and the feeding consistency is poor, and the cable line cannot be matched for impedance debugging after welding, and the matching difficulty of high frequency bandwidth is higher.

[0041] As shown in Figure 2A and Figure 2B , it is a schematic diagram of a double-frequency cavity 100b in the form of steel sheet through cable 101b welding feeding scheme. However, the inner core part of the cable between the feeding point and the return point of the cable welding feeding is exposed, and the feeding form of the cable welding is to match the high frequency impedance through the slotted design on the structure, and the matching difficulty of high frequency bandwidth is higher.

[0042] In order to improve the above problems, the application provides a cavity antenna and an electronic device, which can match the impedance through the matching circuit on the PCB board, increase the high frequency bandwidth, and have higher feeding consistency. The cavity antenna of the application can also save cable material and related process, and save cost.

[0043] Please refer to Figure 3 and Figure 4A structural schematic diagram of a cavity antenna 100 is provided for an embodiment of the present application. It can be understood that the technical solution of the embodiment of the present application can be applied to an electronic device for radiating and receiving electromagnetic wave signals. The electronic device can be a tablet computer, a mobile phone, a notebook computer, a smart watch, a smart bracelet, or other electronic products with wireless communication function. The embodiment of the present application does not specifically limit the specific form of the above electronic device. It can be understood that the cavity antenna 100 of the embodiment of the present application can be arranged in a receiving cavity (not shown in the figure) of the electronic device, and the receiving cavity can be a receiving cavity surrounded by the shell and the display screen of the electronic device. The electronic device can radiate electromagnetic wave signals to the outside or receive electromagnetic wave signals from the outside through the cavity antenna 100, so as to realize wireless communication between the electronic device and other electronic devices.

[0044] As shown in Figure 3 and Figure 4 The cavity antenna 100 of the present application can include a conductive shell 10, and the inside of the conductive shell 10 can form a cavity structure 101. It can be understood that the cavity structure 101 is a cavity. A first opening 102 in communication with the cavity structure 101 can be formed on the surface of the conductive shell 10. In an alternative way, the first opening 102 can be in the shape of a long strip. It can be understood that in other possible implementation manners, two openings in communication with the cavity structure 101 can also be formed on the surface of the conductive shell 10.

[0045] The first opening 102 can be used for transmitting electromagnetic wave signals. When the cavity antenna 100 is arranged in the receiving cavity of the electronic device, the cavity antenna 100 radiates electromagnetic wave signals to the outside of the electronic device or receives electromagnetic wave signals from the outside through the first opening 102, so as to realize wireless communication between the electronic device and other electronic devices.

[0046] It can be understood that in some embodiments, the electronic device can further include a circuit board 200. The circuit board 200 is arranged in the receiving cavity of the electronic device and close to the conductive shell 10.

[0047] The cavity antenna 100 can further include a conductive spring 20 for feeding the conductive shell 10. The conductive spring 20 can be arranged between the conductive shell 10 and the circuit board 200, and the conductive spring 20 can be electrically connected between the conductive shell 10 and the circuit board 200. It can be understood that in an alternative implementation manner, a side surface of the circuit board 200 close to the conductive shell 10 can extend an extension 210, and the conductive spring 20 can be electrically connected between the conductive shell 10 and the extension 210.

[0048] Specifically, the conductive spring 20 includes a first contact portion 21, a connecting portion 22, and a second contact portion 23. The connecting portion 22 can be fixedly connected between one end of the first contact portion 21 and one end of the second contact portion 23. In some alternative implementations, the first contact portion 21, the connecting portion 22, and the second contact portion 23 can be integrally formed, and the first contact portion 21 and the second contact portion 23 are arranged in parallel. It can be understood that the first contact portion 21, the connecting portion 22, and the second contact portion 23 can all be made of a conductive material.

[0049] As shown in Figure 3 and Figure 4 , the first contact portion 21 of the conductive spring 20 can be arranged on the extension portion 210 of the circuit board 200, and the first contact portion 21 of the conductive spring 20 is in electrical contact with the extension portion 210 of the circuit board 200, and the second contact portion 23 of the conductive spring 20 is in electrical contact with the conductive shell 10. Among them, the conductive spring 20 is roughly in the shape of a Z. Based on such a design, the conductive spring 20 can realize the electrical connection between the conductive shell 10 and the circuit board 200. It can be understood that the conductive spring 20 can serve as a feed portion of the cavity antenna 100, and the conductive spring 20 can be used to couple and excite the conductive shell 10. That is, the conductive spring 20 can couple energy into the cavity structure 101 of the conductive shell 10 through electric field / magnetic field coupling, so as to generate an electric field / magnetic field in the cavity structure 101.

[0050] It can be understood that, Figure 3 and Figure 4 are schematically shown some structural components included in the electronic device, the actual structure and position of these structural components are not limited by Figure 3 and Figure 4 , and the electronic device can actually have more or less structural components relative to the structural components shown in Figure 3 and Figure 4 , for example, the electronic device also includes a battery and a display screen (not shown in the figure) and the like.

[0051] Please refer to Figure 5 and 6 , the conductive shell 10 is in the shape of a cuboid as a whole, and the conductive shell 10 includes a metal top plate 11, a metal bottom plate 12, a first metal end plate 13, a second metal end plate 14, and a metal side plate 15. Among them, for the convenience of description, the width direction of the conductive shell 10 is defined as the X-axis direction, the length direction of the conductive shell 10 is defined as the Y-axis direction, and the thickness direction of the conductive shell 10 is defined as the Z-axis direction. The X-axis direction, the Y-axis direction, and the Z-axis direction are perpendicular to each other.

[0052] It can be understood that the "top", "bottom" and other orientation words involved in the present application are all reference to the attached Figure 4The description is shown in the orientation, with the Z-axis positive direction as "top" and the Z-axis negative direction as "bottom", which does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0053] It can be understood that, along the Z-axis direction, the two sides of the first metal end plate 13 are fixedly connected to the first end of the metal bottom plate 12 and the first end of the metal top plate 11 respectively, and the two sides of the second metal end plate 14 are fixedly connected to the second end of the metal bottom plate 12 and the second end of the metal top plate 11 respectively. The two sides of the metal side plate 15 are fixedly connected to the first side of the metal bottom plate 12 and the first side of the metal top plate 11 respectively, and the two ends of the metal side plate 15 are fixedly connected to the first end of the first metal end plate 13 and the second end of the second metal end plate 14 respectively. In other words, the first metal end plate 13 and the second metal end plate 14 are oppositely arranged at the two ends of the metal bottom plate 12. The metal top plate 11 and the metal bottom plate 12 are oppositely arranged.

[0054] It can be understood that, in an alternative implementation, the metal top plate 11 and the metal bottom plate 12 are arranged in parallel, and the first metal end plate 13 and the second metal end plate 14 are arranged in parallel. For example, the metal top plate 11 and the metal bottom plate 12 are parallel to the XY plane, and the first metal end plate 13 and the second metal end plate 14 are parallel to the YZ plane.

[0055] In this embodiment, the length of the metal top plate 11 and the length of the metal bottom plate 12 are the same, and the width of the metal top plate 11 and the width of the metal bottom plate 12 are the same.

[0056] The metal top plate 11, the metal bottom plate 12, the first metal end plate 13, the second metal end plate 14 and the metal side plate 15 together enclose the cavity structure 101.

[0057] In an alternative implementation, the metal top plate 11, the metal bottom plate 12, the first metal end plate 13, the second metal end plate 14 and the metal side plate 15 can be integrally formed, which can ensure the overall strength of the conductive shell 10. It can be understood that the metal top plate 11, the metal bottom plate 12, the first metal end plate 13, the second metal end plate 14 and the metal side plate 15 can be made of steel, iron or aluminum metal materials.

[0058] In this embodiment, the first opening 102 is arranged on one side of the conductive shell 10, and along the X-axis direction, the first opening 102 faces the metal side plate 15. The first opening 102 can communicate the inside and outside of the cavity antenna 100, so that the inside of the cavity antenna 100 is in an open state, and the first opening 102 can be used to realize signal radiation of the cavity antenna 100.

[0059] In an optional implementation, the metal top plate 11 extends outwardly beyond the connecting plate 16 in the direction of the X axis away from the metal side plate 15. The projection of the connecting plate 16 on the metal bottom plate 12 does not fall on the metal bottom plate 12 in the direction from the metal top plate 11 to the metal bottom plate 12. The connecting plate 16 is electrically conductive, and the connecting plate 16 can be electrically connected with the metal top plate 11. It can be understood that the connecting plate 16 can serve as a feeding area of the cavity antenna 100 to achieve direct feeding of the cavity antenna 100.

[0060] In this embodiment, a processor (not shown in the figure) can be mounted on the circuit board 200, and the processor can be electrically connected with the circuit board 200. It can be understood that in some optional implementations, the circuit board 200 can be a mainboard in an electronic device, and the processor can be a central processing unit (CPU) in the electronic device.

[0061] It can be understood that in the direction of the Y axis, the extension 210 is provided with a wire electrically connected with the processor. In this embodiment, the circuit board 200 extends an extension 210 on the side close to the second metal end plate 14, at least a part of the extension 210 is located below the connecting plate 16 and close to the first opening 102. The conductive spring 20 is arranged between the connecting plate 16 and the extension 210. Specifically, the first contact part 21 of the conductive spring 20 is in electrical contact with the extension 210, and the second contact part 23 of the conductive spring 20 is in electrical contact with the connecting plate 16. It can be understood that in some optional implementations, the first contact part 21 of the conductive spring 20 can be welded to the extension 210, and the second contact part 23 of the conductive spring 20 can be welded to the connecting plate 16. In this way, the conductive spring 20 can be stably connected to the connecting plate 16 and the extension 210, and the electrical signal transmission between the conductive shell 10 and the circuit board 200 can also be more stable.

[0062] The processor can transmit antenna signals to the conductive spring 20 through the extension 210 of the circuit board 200, the conductive spring 20 serves as a feeding part of the cavity antenna 100, and transmits the antenna signals sent by the processor to the cavity antenna 100. The cavity antenna 100 can emit signals to the outside of the electronic device according to the antenna signals sent by the processor to realize signal emission of the electronic device. The cavity antenna 100 can also receive antenna signals from the outside of the electronic device, and transmit the received external antenna signals to the extension 210 from the conductive spring 20, and the extension 210 transmits the external antenna signals to the processor from the circuit board 200 to realize signal reception of the electronic device. Thus, wireless communication of the electronic device is realized.

[0063] In an alternative implementation, the cavity antenna 100 may further include a matching circuit (not shown in the figure), and the conductive spring 20 may be electrically connected to the matching circuit, which may be used to achieve impedance matching of the cavity antenna 100.

[0064] The cavity antenna 100 of this application can extend to the cavity structure via a circuit board 200, and the extension 210 on the circuit board 200 can contact the conductive housing 10 via a conductive spring 20, thereby feeding the cavity structure. Furthermore, the conductive spring 20 can be further adjusted for impedance matching via a connected matching circuit. Compared to cavity antennas fed via cables, this application eliminates the need for cable materials and assembly processes, saving costs and providing better power supply consistency. Moreover, the cavity antenna 100 of this application can achieve impedance matching by adjusting the device parameters in the matching circuit, making impedance matching easier.

[0065] It is understood that, in an alternative implementation, the cavity antenna 100 may further include a grounding element (not shown in the figure), which may be electrically connected between the outer surface of the conductive housing 10 and a reference ground to ground the cavity antenna 100. The reference ground may include the metal frame of the display screen, the housing or mid-frame of the electronic device. The grounding element may include, but is not limited to, a spring or a screw.

[0066] Please see Figure 7 This is a schematic diagram of the structure of a cavity antenna 100 provided in another embodiment of this application.

[0067] and Figure 3 to Figure 4 The difference between the illustrated embodiments is that, as Figure 7 As shown, in this embodiment, the feeding section of the cavity antenna 100 can be replaced by a conductive spring sheet with conductive foam 30. That is, the conductive foam 30 is disposed between the connecting plate 16 and the extension 210. The first end of the conductive foam 30 is in contact with the extension 210 and is electrically connected to the extension 210, and the second end of the conductive foam 30 is in contact with the connecting plate 16 and is electrically connected to the connecting plate 16. Based on this design, the extension 210 of the circuit board 200 can feed the cavity antenna 100 through the conductive foam 30.

[0068] It is understandable that conductive foam 30 can also be electrically connected to the matching circuit.

[0069] It can be understood that in other possible implementations, the feeding portion of the cavity antenna 100 can also be replaced by a conductive spring, conductive silicone or the like, as long as the electrical connection between the circuit board 200 and the conductive shell 10 can be realized, and the electrical connection device is not limited in particular.

[0070] Please refer to Figure 8 , a structural schematic diagram of a cavity antenna 100 provided by another embodiment of the application.

[0071] With Figure 7 The difference between the cavity antenna 100 shown in the embodiment is that, as shown in Figure 8 , in the embodiment, the circuit board 200 extends an extension 210 close to the side surface of the second metal end plate 14, and the extension 210 extends into the inside of the cavity structure 101.

[0072] Specifically, please refer to Figure 9 , as shown, the conductive shell 10 can also be provided with a second opening 103 close to the end surface of the circuit board 200, that is, the second metal end plate 14 is provided with the second opening 103. The extension 210 of the circuit board 200 extends into the cavity structure 101 through the second opening 103.

[0073] In other words, in the embodiment, at least a part of the projection of the extension 210 falls on the metal bottom plate 12 from the metal top plate 11 to the metal bottom plate 12. At least a part of the projection of the extension 210 falls on the metal top plate 11 from the metal bottom plate 12 to the metal top plate 11.

[0074] Optionally, in the width direction of the conductive shell 10, the end of the metal top plate 11 away from the metal side plate 15 can be flush with the end of the metal bottom plate 12 away from the metal side plate 15.

[0075] It can be understood that in the embodiment, the conductive foam 30 can be a feeding portion for feeding the cavity antenna 100, and the conductive foam 30 can be arranged between the metal top plate 11 and the extension 210. The first end of the conductive foam 30 is in contact with the top surface of the extension 210, and the first end of the conductive foam 30 can be electrically connected to the extension 210. The second end of the conductive foam 30 is in contact with the metal top plate 11, and the second end of the conductive foam 30 can be electrically connected to the metal top plate 11. Based on such a design, the extension 210 of the circuit board 200 can feed the cavity antenna 100 through the conductive foam 30. In addition, the conductive foam 30 can also be electrically connected to the matching circuit.

[0076] It can be understood that in other possible implementations, the feeding portion in the embodiment can also be replaced by a conductive spring or conductive silica gel, as long as the electrically connecting device that can realize the electrical connection between the circuit board 200 and the conductive shell 10 can be used, and the application does not make specific limitations.

[0077] The cavity antenna 100 in the embodiment is fed by the extension 210 of the circuit board 200 extending to the inside of the cavity structure 101, and the extension 210 on the circuit board 200 can contact the metal top plate 11 of the conductive shell 10 through the electrically connecting device such as the conductive foam, the conductive spring or the conductive silica gel, so as to realize the feeding for the cavity structure. In addition, the conductive spring 20 can be further adjusted through the connected matching circuit to perform impedance matching.

[0078] Please refer to Figure 10 , a structural schematic diagram of a cavity antenna 100 provided by another embodiment of the application.

[0079] With Figure 8 The difference between the cavity antenna 100 shown in the embodiment lies in that, as shown in Figure 10 , in the embodiment, the conductive foam 30 can be a feeding portion for feeding the cavity antenna 100, the extension 210 of the circuit board 200 extends into the cavity structure 101 through the second opening 103, and the conductive foam 30 is arranged between the metal bottom plate 12 and the extension 210.

[0080] The first end of the conductive foam 30 is in contact with the metal bottom plate 12, and the first end of the conductive foam 30 can be electrically connected with the metal bottom plate 12. The second end of the conductive foam 30 is in contact with the bottom surface of the extension 210, and the second end of the conductive foam 30 can be electrically connected with the extension 210.

[0081] It can be understood that in other possible implementations, the feeding portion in the embodiment can also be replaced by a conductive spring or conductive silica gel, as long as the electrically connecting device that can realize the electrical connection between the circuit board 200 and the conductive shell 10 can be used, and the application does not make specific limitations.

[0082] The cavity antenna 100 in the embodiment is fed by the extension 210 of the circuit board 200 extending to the inside of the cavity structure 101, and the extension 210 on the circuit board 200 can contact the metal bottom plate 12 of the conductive shell 10 through the electrically connecting device such as the conductive foam, the conductive spring or the conductive silica gel, so as to realize the feeding for the cavity structure. The conductive spring 20 can be further adjusted through the connected matching circuit to perform impedance matching.

[0083] Please refer to Figure 11 , a structural schematic diagram of a cavity antenna 100 provided by another embodiment of the application.

[0084] and Figure 3 The difference between the cavity antenna 100 shown in the embodiment is that, as Figure 11 As shown, in this embodiment, the cavity antenna 100 may further include a suspended stub 17, which is disposed near the first opening 102 of the conductive housing 10, and a gap 104 exists between the suspended stub 17 and the conductive housing 10. Compared to Figure 3 In this embodiment, the end of the metal top plate 11 away from the metal side plate 15 does not extend out of the connecting plate 16, that is, the end of the metal top plate 11 away from the metal side plate 15 can be flush with the end of the metal bottom plate 12 away from the metal side plate 15.

[0085] Optionally, the levitating branch 17 can be made of a conductive material, and the levitating branch 17 can be coupled to the conductive housing 10.

[0086] In one alternative implementation, the suspended branch 17 is a rectangular plate-like structure.

[0087] In this embodiment, at least a portion of the projection of the suspended branch 17 falls on the extension 210 in the direction from the metal top plate 11 to the metal bottom plate 12.

[0088] The conductive foam 30 can serve as a feed section for powering the cavity antenna 100. The conductive foam 30 is disposed between the suspension stub 17 and the extension 210. Specifically, a first end of the conductive foam 30 is electrically in contact with the extension 210, and a second end of the conductive foam 30 is electrically in contact with the lower surface of the suspension stub 17. Based on this design, the extension 210 of the circuit board 200 can be electrically connected to the suspension stub 17 via the conductive foam 30. The suspension stub 17 can couple the antenna signal transmitted by the extension 210 to the conductive housing 10, thereby achieving coupled feeding of the cavity antenna 100. Furthermore, the conductive foam 30 can also be electrically connected to a matching circuit.

[0089] It is understood that in other possible implementations, the power supply unit in this embodiment can also be replaced by conductive foam 30 with conductive spring or conductive silicone, as long as it is an electrical connection device that can realize the electrical connection between the circuit board 200 and the suspended branch 17. This application does not impose any specific restrictions on this.

[0090] Please refer to the following: Figure 12 and Figure 13 , Figure 12 This is a schematic diagram of a specific absorption ratio (SAR) sensor connection scheme for a cavity antenna 100c. Figure 13 This is a schematic diagram of a SAR sensor connection scheme using the cavity antenna 100 of this application.

[0091] As shown in Figure 12 The cavity antenna 100c adopts a scheme of feeding by a cable. A first end of the cable 501 is electrically connected to the floating branch 502, and a second end of the cable 501 is electrically connected to the radio frequency front end 503 through the capacitor C1. The radio frequency front end 503 is also grounded through the inductor L1. In other words, the floating branch 502 is electrically connected to the radio frequency front end 503 through the cable 501, and the floating branch 502 can be coupled to feed the cavity antenna 100c. The second end of the cable 501 is also electrically connected to a first connection end of the SAR sensor 504, and a second connection end of the SAR sensor 504 is grounded through the capacitor C2. The connection channel between the first connection end of the SAR sensor 504 and the second end of the cable 501 can be used as a detection channel of the SAR sensor 504, and the connection channel between the second connection end of the SAR sensor 504 and the capacitor C2 can be used as a temperature compensation channel of the SAR sensor 504. When the wiring of the temperature compensation channel and the wiring of the detection channel of the SAR sensor are different, the SAR sensor may be deviated.

[0092] It can be understood that, since the detection channel and the temperature compensation channel of the SAR sensor both need to be connected to the cavity antenna, however, the cavity antenna 100c is fed by a cable, and the detection channel of the SAR sensor can be electrically connected to one end of the cable 501. Since the SAR is arranged on the circuit board, the temperature compensation channel of the SAR sensor cannot be electrically connected to the floating branch 502. Therefore, in the scenario shown in Figure 12 The cavity antenna 100c adopts a scheme of feeding by a cable, and the temperature compensation channel of the SAR sensor is missing, that is, the detection channel and the temperature compensation channel of the SAR sensor are quite different, and the temperature compensation channel is limited, so that the SAR sensor is invalid, and the SAR sensor may be deviated.

[0093] As shown in Figure 13As shown, the cavity antenna 100 of this application uses conductive foam for power feeding. The RF front-end 603 is electrically connected to the circuit board 200 via capacitor C3, and is also grounded via inductor L2. The first connection terminal of the SAR sensor 604 is electrically connected to the circuit board 200, and the second connection terminal of the SAR sensor 604 is also electrically connected to the circuit board 200 and grounded via a capacitor (not shown) on the circuit board 200. The extension on the circuit board 200 can be electrically connected to the suspended stub 17 via conductive foam, thereby achieving coupled power feeding for the cavity antenna 100. The connection channel between the first connection terminal of the SAR sensor 604 and the circuit board 200 can serve as the detection channel for the SAR sensor 604, and the connection channel between the second connection terminal of the SAR sensor 604 and the circuit board 200 can serve as the temperature compensation channel for the SAR sensor 604. This application extends the circuit board 200 to the cavity structure 101, and uses conductive foam, conductive springs, or conductive silicone to power the cavity antenna 100. Both the detection channel and the temperature compensation channel of the SAR sensor 604 can be electrically connected to the circuit board 200, thus ensuring that both the detection channel and the temperature compensation channel of the SAR sensor 604 are electrically connected to the cavity antenna 100. Based on this design, the routing of the temperature compensation channel of the SAR sensor 604 is the same as that of the detection channel, solving the aforementioned... Figure 12 The issue of temperature compensation channel for SAR sensors in various scenarios can be addressed to ensure the normal operation of SAR sensors. In other words, by adopting the feeding scheme of the cavity antenna 100 in this application, the detection channel and temperature compensation channel of the SAR sensor can be unrestricted.

[0094] The following combination Figure 14 and Figure 15 The antenna performance of the cavity antenna 100 of this application is compared and analyzed with that of a conventional cavity antenna.

[0095] Figure 14 This is a graph showing the return loss (S11) curves of the cavity antenna 100 of this application and a conventional cavity antenna. The horizontal axis represents frequency in GHz, and the vertical axis represents return loss in dB.

[0096] Curve S101 indicates the return loss curve of the cavity antenna 100 of this application. Curve S102 indicates the return loss curve of a conventional cavity antenna.

[0097] Figure 15 The images show the Smith charts of the cavity antenna 100 of this application and a conventional cavity antenna. Curve S401 indicates the original Smith chart curve of the cavity antenna 100 of this application. Curve S402 indicates the original Smith chart curve of a conventional cavity antenna.

[0098] Figure 16This diagram shows the radiation efficiency curves of the cavity antenna 100 of this application and a conventional cavity antenna. Curve S201 indicates the radiation efficiency curve of a conventional cavity antenna, and curve S202 indicates the system efficiency curve of a conventional cavity antenna. Curve S203 indicates the radiation efficiency curve of the cavity antenna 100 of this application, and curve S204 indicates the system efficiency curve of the cavity antenna 100 of this application.

[0099] Obviously, by Figure 14 to Figure 16 It can be seen that, compared with the cable-fed scheme in traditional cavity antennas, the cavity antenna 100 of this application expands the system efficiency -4dB bandwidth from 1200MHz to 2400MHz in the 5G Wi-Fi band. Therefore, it can be concluded that by adding a matching circuit at the rear end of the conductive spring in the cavity antenna 100 of this application, impedance matching can be further adjusted, and high-frequency bandwidth can be increased, resulting in significant antenna efficiency gains.

[0100] Figure 17 The diagram shows a comparison of simulation results of the cavity antenna 100 using the present application. Curve S301 indicates the radiation efficiency curve of the cavity antenna 100 of the present application, curve S302 indicates the S11 curve of the cavity antenna 100 of the present application, and curve S303 indicates the system efficiency curve of the cavity antenna 100 of the present application.

[0101] like Figure 17 As shown, at a feed frequency of 2.261 GHz, the cavity antenna 100 of this application operates in the fundamental mode TE. 0.5 0.5 0-mode. At a feed frequency of 3.857 GHz, the cavity antenna 100 of this application operates in the fundamental mode TE. 1.5 0.5 0-mode. At a feed frequency of 4.8759 GHz, the cavity antenna 100 of this application operates in the fundamental mode TE. 0.50.50 The cavity antenna 100 of this application operates in the fundamental mode TE at a feed frequency of 5.131 GHz. 0.5 0.5 0-mode. At a feed frequency of 5.3985 GHz, the cavity antenna 100 of this application operates in the fundamental mode TE. 2.5 0.5 0-mode. At a feed frequency of 5.621 GHz, the cavity antenna 100 of this application operates in the fundamental mode TE. 2.5 0.5 0-mode. At a feed frequency of 6.265 GHz, the cavity antenna 100 of this application operates in the fundamental mode TE. 1.5 0.5 0 mode.

[0102] fromFigure 17 It can be seen that the cavity antenna 100 and its feeding scheme can also excite the antenna mode of the cavity antenna.

[0103] The cavity antenna 100 can be extended to the cavity structure through the circuit board, and impedance matching can be performed through the matching circuit connected to the feeding portion, so as to increase the high-frequency bandwidth, improve the antenna performance, and have higher feeding consistency. The cavity antenna can also save cable materials and assembly processes, and save costs. In addition, the cavity antenna can also make the detection channel and the temperature compensation channel of the SAR sensor unrestricted.

[0104] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of some embodiments of the present application, rather than limiting. Although some embodiments of the present application are described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of some embodiments of the present application can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of some embodiments of the present application.

Claims

1. A cavity antenna, used in electronic devices, characterized in that, The cavity antenna includes a conductive housing and a feed section; The conductive housing has a cavity structure inside, and a first opening is provided on the conductive housing, which is connected to the cavity structure. The power supply section is disposed on the conductive housing; wherein, the circuit board is electrically connected to the conductive housing through the power supply section, or the circuit board is coupled to the conductive housing through the power supply section; the power supply section is any one of conductive spring, conductive foam, or conductive silicone. The feeding section, the first opening, and the cavity structure together constitute the cavity antenna. The cavity antenna is fed through the feeding section and radiates or receives electromagnetic wave signals through the first opening.

2. The cavity antenna according to claim 1, characterized in that, The cavity antenna also includes a matching circuit, which is electrically connected to the feed section for impedance matching of the cavity antenna.

3. The cavity antenna according to claim 1, characterized in that, An extension portion extends from the side of the circuit board near the first opening, and the power supply portion is electrically connected between the conductive housing and the extension portion.

4. The cavity antenna according to claim 1, characterized in that, The conductive housing is a one-piece molded structure.

5. The cavity antenna according to claim 3, characterized in that, The conductive housing includes a metal top plate, a metal bottom plate, a first metal end plate, a second metal end plate, and metal side plates; The two sides of the first metal end plate are fixedly connected to the first end of the metal base plate and the first end of the metal top plate, respectively; the two sides of the second metal end plate are fixedly connected to the second end of the metal base plate and the second end of the metal top plate, respectively; the two sides of the metal side plate are fixedly connected to the first side of the metal base plate and the first side of the metal top plate, respectively; and the two ends of the metal side plate are fixedly connected to the first end of the first metal end plate and the second end of the second metal end plate, respectively. The metal top plate, the metal bottom plate, the first metal end plate, the second metal end plate, and the metal side plate together form the cavity structure.

6. The cavity antenna according to claim 5, characterized in that, The first opening is located on one side of the conductive housing, and along the first direction, the first opening faces the metal side plate.

7. The cavity antenna according to claim 6, characterized in that, Along a first direction, a connecting plate extends outward from the side of the metal top plate away from the metal side plate. The connecting plate is electrically connected to the metal top plate, and at least a portion of the extension is located below the connecting plate.

8. The cavity antenna according to claim 7, characterized in that, The power supply section is disposed between the extension section and the connecting plate. One end of the power supply section is in contact with the connecting plate and is electrically connected to the connecting plate. The other end of the power supply section is in contact with the extension section and is electrically connected to the extension section.

9. The cavity antenna according to claim 5, characterized in that, A second opening is formed on the second metal end plate, and the second opening is connected to the cavity structure. The extension of the circuit board extends into the cavity structure through the second opening. The first end of the power supply part contacts the extension, and the second end of the power supply part contacts the metal top plate.

10. The cavity antenna according to claim 5, characterized in that, A second opening is formed on the second metal end plate, and the second opening is connected to the cavity structure. The extension of the circuit board extends into the cavity structure through the second opening. The first end of the power supply part contacts the extension, and the second end of the power supply part contacts the metal base plate.

11. The cavity antenna according to claim 3, characterized in that, The cavity antenna further includes a suspended stub, which is disposed near the first opening of the conductive housing. The first end of the feed section contacts the extension, and the second end of the feed section contacts the suspended stub. The suspended stub is coupled to the conductive housing.

12. An electronic device, characterized in that, The device includes a circuit board, a processor, and a cavity antenna as described in any one of claims 1 to 11, wherein the processor is mounted on the circuit board and is electrically connected to the circuit board.

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