Cavity antenna and terminal

Abstract

The utility model discloses a cavity antenna and a terminal, the cavity antenna is applied to the terminal, the terminal comprises a metal rear shell or a metal frame, the cavity antenna comprises a metal shell, the metal shell is internally provided with a cavity, and one side of the cavity is provided with an opening; elastic pin assemblies are integrally formed on two surfaces, which are oppositely arranged in the thickness direction, of the shell respectively, one group of elastic pin assemblies are pressed on one of the metal rear shell and the metal frame, and the other group of elastic pin assemblies are pressed on the other one of the metal rear shell and the metal frame; first elastic pins are integrally formed on two surfaces, which are oppositely arranged in the thickness direction, of the shell respectively; a part of the circuit board penetrates into the cavity through the opening, and the free ends of the two first elastic pins are respectively connected to the circuit board in a pressing manner. Therefore, the step of additionally installing an elastic sheet or carrying out complex welding in a traditional mode is omitted, the production process is simplified, the assembly process is more direct and efficient, and meanwhile the production cost is remarkably reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of antennas, and in particular to a cavity antenna and a terminal. Background Art

[0002] A cavity antenna is an antenna that radiates electromagnetic waves through a resonant cavity. Its working principle is to input electromagnetic waves into the cavity and enhance the radiation capability of the electromagnetic waves through resonance.

[0003] In current cavity antenna designs, to achieve an electrical connection between the PCB (Printed Circuit Board) and the metal frame or back cover of the LCD (Liquid Crystal Display), a shielding cover must be soldered onto the PCB to isolate it from external electromagnetic interference. Subsequently, the top of the shielding cover must be connected to one of the metal back covers or LCD metal frames by soldering multiple additional spring clips, thus forming the top surface of the cavity antenna. Correspondingly, multiple additional spring clips must also be soldered to the bottom of the PCB, which, together with the other LCD metal frame or back cover metal, forms the bottom surface of the cavity antenna. This overall operation is cumbersome and costly. Utility Model Content

[0004] The utility model aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, the first purpose of the present invention is to propose a cavity antenna that eliminates the need for additional installation of shrapnel or complex welding steps in traditional methods, simplifies the production process, makes the assembly process more direct and efficient, and significantly reduces production costs.

[0006] The second purpose of the present invention is to provide a terminal.

[0007] A first embodiment of the utility model provides a cavity antenna, which is applied to a terminal, wherein the terminal includes a metal back shell or a metal frame, and the cavity antenna includes: a metal shell, a cavity is provided inside the metal shell, and an opening is provided on one side of the cavity; elastic foot assemblies are respectively integrally formed on two surfaces of the shell arranged opposite to each other in the thickness direction, one group of the elastic foot assemblies is crimped onto one of the metal back shell or the metal frame, and the other group of the elastic foot assemblies is crimped onto the other of the metal back shell or the metal frame; first elastic feet are respectively integrally formed on two surfaces of the shell arranged opposite to each other in the thickness direction; and a circuit board, a portion of the circuit board is passed through the opening into the cavity, and the free ends of the two first elastic feet are respectively crimped onto the circuit board.

[0008] The cavity antenna of the present invention has the elastic foot assembly and the first elastic foot integrally formed on the shell. Therefore, the firmness and integration of the elastic foot assembly and the first elastic foot on the shell are increased, and electrical connection with the metal back shell, metal frame and circuit board can be achieved, eliminating the steps of additional installation of shrapnel or complex welding that may be required in traditional methods, simplifying the production process, making the assembly process more direct and efficient, and significantly reducing production costs.

[0009] In addition, the cavity antenna proposed in the application may also have the following additional technical features:

[0010] Specifically, the elastic foot assembly includes a plurality of second elastic feet, and the second elastic feet and the first elastic feet are both stamped and formed on the shell.

[0011] Specifically, the free ends of the second elastic feet in the two groups of the elastic foot assemblies are inclined in a direction away from the housing.

[0012] Specifically, the shell includes a first plate, a second plate and two third plates arranged opposite to each other, wherein the first plate and the second plate are arranged between the two third plates, and the first elastic foot and the second elastic foot are both stamped on the third plates.

[0013] Specifically, the first plate body and the second plate body are butted against each other, and together with the two third plates, form the cavity having the opening and the two side surfaces.

[0014] Specifically, the shell further includes a fourth plate, which is disposed between the two third plates, docked with the second plate, and enclosed with the two third plates to form the cavity having the opening and three side surfaces.

[0015] Specifically, the opening includes a first part and a second part, the first part is arranged on the side of the shell corresponding to the first plate body, the second part is arranged on the side of the shell corresponding to the second plate body, and the first part and the second part are connected.

[0016] Specifically, one of the first elastic pins is pressed onto the excitation signal contact of the circuit board, and the other first elastic pin is pressed onto the signal ground contact of the circuit board, and the pressing point between the first elastic pin and the circuit board is the position of the excitation port, and the distance from the excitation port to the first board body or the fourth board body is less than 1 / 4 wavelength.

[0017] Specifically, the distance dimension in the length direction of the cavity is less than 1 / 2 wavelength.

[0018] A second aspect of the present invention provides a terminal, comprising the above-mentioned cavity antenna, a metal back shell and a metal frame, wherein the cavity antenna is fixed in the terminal and arranged between the metal back shell and the metal frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present invention, and together with the description, serve to explain the principles of the present invention.

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0021] Figure 1 Schematic diagram of the structure of a cavity antenna according to one embodiment of the present invention;

[0022] Figure 2 This is a front view of a cavity antenna according to one embodiment of the present invention;

[0023] Figure 3 This is a schematic structural diagram of a cavity antenna assembly according to one embodiment of the present invention;

[0024] Figure 4 Schematic diagram of the structure of a cavity antenna according to another perspective of an embodiment of the present invention.

[0025] As shown in the figure:

[0026] 10. Housing; 11. Elastic foot assembly; 12. First elastic foot; 100. First plate; 101. Second plate; 102. Third plate; 103. Fourth plate; 104. Cavity; 105. Opening; 110. Second elastic foot; 1040. First portion; 1041. Second portion;

[0027] 20. Circuit board;

[0028] 30. Metal back cover;

[0029] 40. Metal frame. DETAILED DESCRIPTION

[0030] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the scheme of the present invention will be further described below. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.

[0031] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present invention, rather than all of the embodiments.

[0032] The cavity antenna and terminal according to the embodiments of the present invention are described below with reference to the accompanying drawings.

[0033] like Figure 1 、 Figure 2 and Figure 3 As shown, the cavity antenna of the first embodiment of the present invention is applied to a terminal. The terminal includes a metal back shell 30 or a metal frame 40 , and the cavity antenna includes a metal shell 10 and a circuit board 20 .

[0034] A cavity 104 is defined inside the metal shell 10 .

[0035] Among them, the metal material in the metal shell 10 can be aluminum, iron, etc., which can be selected according to actual conditions. The metal shell 10 is used to form the cavity 104 into a metal cavity. The metal cavity serves as a radiator. When the electromagnetic wave enters the cavity 104, it will be reflected back and forth between the inner walls of the cavity 104, thereby generating electromagnetic resonance. At the same time, the metal shell 10 can also form a natural electromagnetic shielding layer. This shielding layer can block or weaken electromagnetic radiation and interference signals from the outside, protecting the internal circuit of the cavity antenna from interference from the external environment.

[0036] An opening 105 is provided on one side of the cavity 104. The design of the opening 105 not only allows the circuit board 20 to be inserted, but also serves as the main channel for electromagnetic waves to enter and exit the cavity 104. The size, shape and position of the opening 105 will affect the electromagnetic field distribution in the cavity, and thus affect the input impedance of the antenna. By adjusting the design of the opening 105 according to actual conditions, the impedance matching of the antenna can be optimized and the transmission efficiency can be improved.

[0037] The shell 10 is provided with elastic foot assemblies 11 formed integrally on two surfaces arranged opposite to each other in the thickness direction. One set of elastic foot assemblies 11 is pressed onto one of the metal rear shell 30 or the metal frame 40, and the other set of elastic foot assemblies 11 is pressed onto the other of the metal rear shell 30 or the metal frame 40. The thickness direction of the shell 10 can be referred to as Figure 1 The direction of the Y axis.

[0038] It is understandable that when a group of elastic foot assemblies 11 are crimped onto the metal back shell 30, a group of elastic foot assemblies 11 can be pressed tightly onto the metal frame 40. The positions of the metal frame 40 and the metal back shell 30 can be interchanged, so there is no need to pay special attention during installation, which greatly improves the flexibility of the metal shell 10 during installation. The elastic foot assemblies 11 are directly crimped onto the metal back shell 30 or the metal frame 40. This physical direct contact achieves good grounding. Good grounding helps reduce the impedance in the signal loop and improve the stability and integrity of the signal. The elastic foot assemblies 11 provide a low-impedance grounding path for the cavity antenna. At the same time, the metal back shell 30 and the metal frame 40 also form a natural electromagnetic shielding layer. This shielding layer can block or weaken electromagnetic radiation and interference signals from outside the antenna.

[0039] First elastic feet 12 are integrally formed on two surfaces of the housing 10 that are opposite to each other in the thickness direction, and the free ends of the two first elastic feet 12 are respectively pressed onto the circuit board 20 that passes through the opening 105 and is placed in the cavity 104 .

[0040] It should be noted that the circuit board 20 described in this example may be a rigid circuit board or a flexible circuit board.

[0041] Specifically, since the elastic foot assembly 11 and the first elastic foot 12 are both integrally formed on the shell 10, the firmness and integration of the elastic foot assembly 11 and the first elastic foot 12 on the shell 10 are increased, and electrical connection with the metal back shell 30, the metal frame 40 and the circuit board 20 can be achieved, eliminating the steps of additional installation of springs or complex welding that may be required in traditional methods, simplifying the production process, making the assembly process more direct and efficient, and significantly reducing production costs.

[0042] To illustrate the above embodiment, in one embodiment of the present invention, as shown in FIG. Figure 1 and Figure 2 As shown, the elastic foot assembly 11 includes a plurality of second elastic feet 110 , and the second elastic feet 110 and the first elastic feet 12 are both stamped and formed on the housing 10 .

[0043] The second elastic foot 110 and the first elastic foot 12 are stamped directly onto the housing 10. This integrated design enhances the overall structural strength and stability. Compared to components connected by welding or riveting, the integrated structure is less likely to loosen or fall off during long-term use. Integrated stamping eliminates multiple steps in the traditional manufacturing process, such as welding and riveting, thereby shortening production cycles and reducing production costs.

[0044] Further, if Figure 1 and Figure 2As shown, the free ends of the second elastic feet 110 in both sets of elastic foot assemblies 11 are tilted away from the housing 10. This tilted design causes the free ends of the second elastic feet 110 to undergo a certain degree of elastic deformation after being pressed against the metal back cover 30 or metal frame 40 to adapt to the shape and angle of the contact surface. This elastic deformation helps to form a closer contact between the second elastic feet 110 and the metal back cover 30 or metal frame 40, thereby increasing the actual contact area. Due to the tilt angle, the contact pressure is distributed along the inclined surface. This distributed contact pressure helps to make the contact surface more uniform and stable, thereby improving the reliability and durability of the contact.

[0045] In one embodiment of the present invention, Figure 1 and Figure 4 As shown, the housing 10 includes a first plate body 100 , a second plate body 101 and two third plate bodies 102 arranged opposite to each other.

[0046] The first plate body 100 and the second plate body 101 are disposed between the two third plate bodies 102 , and the first elastic foot 12 and the second elastic foot 110 are both stamped on the third plate body 102 .

[0047] Specifically, the first plate 100 and the second plate 101 can support the two third plates 102 , thereby improving the firmness of the housing 10 and enclosing to form the cavity 104 .

[0048] In one embodiment of the present invention, Figure 1 As shown, the first plate 100 and the second plate 101 are docked together and enclosed with the two third plates 102 to form a cavity 104 with an opening 105 and two side surfaces. The overall structure is relatively simple, which reduces unnecessary material usage and reduces costs.

[0049] In another embodiment of the present invention, Figure 1 As shown, the shell 10 also includes a fourth plate 103, which is arranged between the two third plates 102, and the fourth plate 103 is docked with the second plate 101, and together with the two third plates 102, forms a cavity 104 with an opening 105 and three sides. The addition of the fourth plate 103 forms a cavity 104 with three sides. This design increases the structural strength of the cavity 104 and improves the overall stability of the cavity antenna. At the same time, more sides have better electromagnetic shielding effects, which helps to reduce the impact of external electromagnetic interference on the antenna performance, thereby improving the frequency stability of the antenna.

[0050] In one embodiment of the present invention, Figure 1As shown, the opening 105 includes a first part 1040 and a second part 1041. The first part 1040 is arranged on the side of the shell 10 corresponding to the first plate body 100, and the second part 1041 is arranged on the side of the shell 10 corresponding to the second plate body 101, and the first part 1040 and the second part 1041 are connected. The opening 105 of the first part 1040 and the second part 1041 can radiate the electromagnetic waves of the cavity antenna, and by adjusting the size of the first part 1040, the transmission path and mode of the electromagnetic waves inside the cavity 104 can be changed, thereby having the effect of adjusting the impedance. At the same time, the first part 1040 provides an insertion port for the circuit board 20.

[0051] In one embodiment of the present invention, Figure 3 As shown, one first elastic pin 12 is crimped onto the excitation signal contact of the circuit board 20, and the other first elastic pin 12 is crimped onto the signal ground contact of the circuit board 20, and the crimping point between the first elastic pin 12 and the circuit board 20 is the position of the excitation port, and the distance from the excitation port to the first plate body 100 or the fourth plate body 103 is less than 1 / 4 wavelength.

[0052] It should be noted that during the design and debugging stage, a position with the best input reflection coefficient can be found as the position of the excitation port, and this position is the crimping point between the first spring foot 12 and the circuit board 20. Since the resonant frequency of the cavity antenna is closely related to its size, in order to excite the 1 / 2 wavelength mode and its higher-order modes, the distance from the excitation port to the first plate 100 or the fourth plate 103 is less than 1 / 4 wavelength. When this distance is less than 1 / 4 wavelength, the antenna is more likely to resonate at these specific wavelengths, thereby exciting the corresponding mode.

[0053] In one embodiment of the present invention, the length dimension of the cavity 104 is less than 1 / 2 wavelength, wherein the reasonable selection of the length of the cavity 104 helps to more effectively concentrate and radiate the electromagnetic energy into space. When the length is less than 1 / 2 wavelength, the cavity 104 can more effectively radiate the electromagnetic waves in a direction, thereby improving the radiation efficiency of the cavity antenna. The length of the cavity 104 is the distance between the fourth plate 103 and the first plate 100, which can also be referred to. Figure 1 The direction of the X axis.

[0054] In an embodiment of the second aspect of the present invention, a terminal includes the above-mentioned cavity antenna, metal back shell 30 and metal frame 40, wherein the cavity antenna is fixed in the terminal and arranged between the metal back shell 30 and the metal frame 40, wherein the metal back shell 30 refers to the back shell in the terminal device, and the metal frame 40 refers to the LCD metal frame in the terminal device. Secondly, the terminal can be a tablet computer, mobile phone, laptop computer and other devices.

[0055] It should be noted that the shell 10 and the circuit board 20 in the present cavity antenna can be fixed on the internal structural parts of the terminal to ensure that the positions of the shell 10 and the circuit board 20 are fixed. The fixing method can be selected according to actual conditions. For example, direct fixation can be in the form of screws or snaps, while indirect fixation can use a bracket. Since the fixing method is an existing technology, it will not be elaborated here.

[0056] It should be noted that the explanation of the aforementioned cavity antenna embodiment is also applicable to the terminal of this embodiment and will not be repeated here.

[0057] In summary, the cavity antenna and terminal of the present invention eliminate the need for additional installation of shrapnel or complex welding steps in traditional methods, simplify the production process, make the assembly process more direct and efficient, and significantly reduce production costs.

[0058] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0059] The foregoing description is intended only to provide specific embodiments of the present invention, which will enable those skilled in the art to understand and implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not intended to be limited to the embodiments described herein, but rather to be embodied in the broadest possible manner consistent with the principles and novel features disclosed herein.

Claims

1. A cavity antenna, used in a terminal, wherein the terminal includes a metal back shell or a metal frame, characterized in that: The cavity antenna includes: A metal shell, wherein a cavity is provided inside the metal shell, and an opening is provided on one side of the cavity; Elastic foot assemblies are integrally formed on two surfaces of the housing that are arranged opposite to each other in the thickness direction, one group of the elastic foot assemblies is pressed onto one of the metal rear housing or the metal frame, and the other group of the elastic foot assemblies is pressed onto the other of the metal rear housing or the metal frame; The shell is respectively integrally formed with first elastic feet on two surfaces that are arranged opposite to each other in the thickness direction; A circuit board, part of which passes through the opening and is placed in the cavity, and the free ends of the two first elastic feet are respectively pressed onto the circuit board.

2. The cavity antenna according to claim 1, wherein: The elastic foot assembly includes a plurality of second elastic feet, and the second elastic feet and the first elastic feet are both stamped and formed on the shell.

3. The cavity antenna according to claim 2, wherein: The free ends of the second elastic feet in the two groups of elastic foot assemblies are both inclined in a direction away from the housing.

4. The cavity antenna according to claim 2, wherein: The housing includes a first plate, a second plate and two third plates arranged opposite to each other, wherein: The first plate body and the second plate body are arranged between the two third plate bodies, and the first elastic foot and the second elastic foot are both stamped on the third plate bodies.

5. The cavity antenna according to claim 4, characterized in that: The first plate body and the second plate body are butted against each other and, together with the two third plates, enclose the cavity body having the opening and two side surfaces.

6. The cavity antenna according to claim 4, characterized in that: The shell further includes a fourth plate, which is disposed between the two third plates. The fourth plate is docked with the second plate and enclosed with the two third plates to form the cavity having the opening and three side surfaces.

7. The cavity antenna according to any one of claims 5 to 6, characterized in that: The opening includes a first portion and a second portion, wherein the first portion is arranged on a side surface of the shell corresponding to the first plate body, and the second portion is arranged on a side surface of the shell corresponding to the second plate body, and the first portion and the second portion are communicated.

8. The cavity antenna according to claim 6, wherein: One of the first elastic pins is pressed onto the excitation signal contact of the circuit board, and the other first elastic pin is pressed onto the signal ground contact of the circuit board, and the pressing point between the first elastic pin and the circuit board is the position of the excitation port, and the distance from the excitation port to the first plate body or the fourth plate body is less than 1 / 4 wavelength.

9. The cavity antenna according to claim 1, wherein: The distance dimension in the length direction of the cavity is less than 1 / 2 wavelength.

10. A terminal, characterized in that: The terminal comprises the cavity antenna, metal back shell and metal frame according to any one of claims 1 to 9, wherein the cavity antenna is fixed in the terminal and arranged between the metal back shell and the metal frame.

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