Antenna structure and electronic device

Abstract

An antenna structure and an electronic device are disclosed. The electronic device includes the antenna structure. The antenna structure includes a metal casing, a circuit board, a ground metal part, a feed-in metal part, a first short-circuit metal part, a second short-circuit metal part, and a third short-circuit metal part. The metal casing has an opening. The circuit board is disposed in the metal casing and faces the opening. The ground metal part and the feed-in metal part are disposed on the circuit board. The feed-in metal part has a ground end and a feed-in end, and the ground end is connected to the ground metal part. The first short-circuit metal part is connected between the feed-in metal part and the metal casing. The second short-circuit metal part and the third short-circuit metal part are connected between the ground metal part and the metal casing. The feed-in metal part is configured to feed a signal from a signal source to excite the metal casing to generate an operating frequency. The antenna structure provided by the present application uses the metal casing as the radiator of the antenna, has lower directivity, and can be applied to various use scenarios of the electronic device.

Description

Technical Field

[0001] This invention relates to the field of antenna structure and electronic device technology, specifically to an antenna structure suitable for a metal casing and an electronic device having the antenna structure. Background Technology

[0002] In current technology, communication products are trending towards miniaturization, aesthetic appeal, and sufficient structural strength. This trend leads to the widespread use of metal for the casing of these products. However, the properties of metal casings can easily interfere with the internal antenna, thus reducing the communication quality of the mobile device. Furthermore, antennas require clearance areas above and below their mounting location, and these areas cannot contain metal or other circuit components. This, in turn, reduces the efficient use of internal space in electronic devices.

[0003] Therefore, how to successfully design an effective antenna within the limited space of an electronic device with a metal casing has become one of the important issues that this field wants to solve. Summary of the Invention

[0004] In view of the problems in the prior art, the purpose of the present invention is to provide an antenna structure and electronic device to solve the problem of insufficient antenna design space inside the electronic device.

[0005] This invention provides an antenna structure, comprising: a metal housing having an opening; a circuit board disposed within the metal housing, with the circuit board facing the opening; a grounding metal portion disposed on the circuit board; a feed metal portion disposed on the circuit board, the feed metal portion having a ground terminal and a feed terminal, the ground terminal being connected to the grounding metal portion and the feed terminal being connected to a signal source; a first short-circuit metal portion having a first end and a second end, the first end being connected to the feed metal portion and the second end being connected to the metal housing; and a second short-circuit metal portion and a third short-circuit metal portion, each of the second short-circuit metal portion and the third short-circuit metal portion having one end connected to the grounding metal portion and the other end connected to the metal housing;

[0006] The feeding metal section is used to feed a signal through the signal source to excite the metal housing to generate an operating frequency.

[0007] In some embodiments, the operating frequency is between 2.4 and 2.5 GHz.

[0008] In some embodiments, a resonant path is formed between the second short-circuit metal portion and the third short-circuit metal portion along the contour of the metal housing, the length of the resonant path being between 0.3 and 0.7 times the wavelength of the operating frequency.

[0009] In some embodiments, at least one inductor component is further included, the at least one inductor component being connected between the second short-circuited metal portion and the grounded metal portion or between the third short-circuited metal portion and the grounded metal portion.

[0010] In some embodiments, the inductance value of the at least one inductor component is between 0 nF and 15 nF.

[0011] In some embodiments, the at least one inductor component includes a first inductor component and a second inductor component, the first inductor component and the second inductor component being respectively connected between the second short-circuited metal portion and the grounded metal portion and between the third short-circuited metal portion and the grounded metal portion.

[0012] In some embodiments, the length of the feed metal portion between the feed end and the first end of the first short-circuit metal portion is less than the length of the feed metal portion between the ground end and the first end of the first short-circuit metal portion.

[0013] In some embodiments, the length between the feed end and the first end of the first short-circuit metal portion is less than 3 / 4 times the length of the feed metal portion.

[0014] In some embodiments, the feed metal portion forms a receiving region around the circuit board, the receiving region being used to receive a component, and the distance between the component and the feed metal portion is greater than 1 mm.

[0015] This invention also provides an electronic device, comprising:

[0016] The antenna structure as described above; and

[0017] A button cover is mounted on the antenna structure.

[0018] The antenna structure and electronic device provided by this invention have the following advantages:

[0019] The antenna structure and electronic device provided by this invention can generate the desired operating frequency by stimulating the metal casing through a circuit board disposed inside a metal casing with a unidirectional opening, and by arranging a feed metal portion, a first short-circuit metal portion, a second short-circuit metal portion, and a third short-circuit metal portion on the circuit board. Compared with the antenna structures of the prior art, the antenna structure provided by this invention uses the metal casing as the radiator of the antenna, thus exhibiting lower directivity and being suitable for various different application scenarios of electronic devices. Attached Figure Description

[0020] Other features, objects, and advantages of the invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings.

[0021] Figure 1 This is a schematic diagram of the electronic device of the present invention.

[0022] Figure 2 This is a schematic diagram of the antenna structure according to the first embodiment of the present invention.

[0023] Figure 3 This is an exploded view of the antenna structure according to the first embodiment of the present invention.

[0024] Figure 4 This is a schematic diagram of the antenna structure according to the first embodiment of the present invention.

[0025] Figure 5 for Figure 4 The reverse side diagram.

[0026] Figure 6 This is a top view of the antenna structure according to the first embodiment of the present invention.

[0027] Figure 7 This is a reverse view of the antenna structure according to the second embodiment of the present invention.

[0028] Figure 8 This is a schematic diagram of the antenna structure according to the third embodiment of the present invention.

[0029] Figure 9 This is a schematic diagram of the radiation field pattern of the antenna structure of the present invention in the XZ plane.

[0030] Figure 10 This is a schematic diagram of the radiation field pattern of the antenna structure of the present invention in the YZ plane.

[0031] Figure 11 This is a schematic diagram of the radiation pattern of the antenna structure of the present invention in the XY plane.

[0032] Figure label:

[0033] U button cover

[0034] M antenna structure

[0035] H Metal casing

[0036] H0 opening

[0037] H1 bottom

[0038] 1 Circuit board

[0039] 2. Grounding metal part

[0040] 3. Feeding metal section

[0041] 31 Grounding terminal

[0042] 32 Feed-in end

[0043] 4 First short-circuit metal part

[0044] 41 First End

[0045] 42 Second End

[0046] 5 Second short-circuit metal part

[0047] 6 Third Short-Circuit Metal Section

[0048] 71 First Inductor Component

[0049] 72 Second Inductor Component

[0050] P Resonance Path

[0051] Component B

[0052] C. Accommodation Area

[0053] G spacing Detailed Implementation

[0054] The following specific embodiments illustrate the implementation of the "antenna structure and electronic device" disclosed in this invention. Those skilled in the art can understand the advantages and effects of this invention from the content disclosed in this specification. This invention can be implemented or applied through other different specific embodiments, and various details in this specification can also be modified and changed based on different viewpoints and applications without departing from the concept of this invention. Furthermore, the accompanying drawings of this invention are for simple illustrative purposes only and are not depictions of actual dimensions, as stated in advance. The following embodiments will further describe the relevant technical content of this invention in detail, but the disclosed content is not intended to limit the scope of protection of this invention. Additionally, it should be understood that although terms such as "first," "second," and "third" may be used herein to describe various components, these components should not be limited by these terms. These terms are mainly used to distinguish one component from another. Furthermore, the term "or" as used herein may, depending on the actual situation, include any one or more combinations of the associated listed items.

[0055] See Figures 1 to 4 As shown, Figure 1 This is a schematic diagram of the electronic device of the present invention. Figure 2This is a schematic diagram of the antenna structure according to the first embodiment of the present invention. Figure 3 This is an exploded view of the antenna structure according to the first embodiment of the present invention. Figure 4 This is a schematic diagram of the antenna structure of the first embodiment of the present invention, omitting the metal casing. Figure 1 As shown, this invention provides an electronic device, which may be a button module, but is not limited thereto. The electronic device includes a button cover U and an antenna structure M, with the button cover U disposed on the antenna structure M. Figures 2 to 4 As shown, the antenna structure M includes a metal housing H, a circuit board 1, a grounding metal part 2, a feed metal part 3, and a first short-circuit metal part 4. It should be noted that the metal housing H can be a part of the outer casing of an electronic device. Figure 3 As shown, the metal casing H has an opening H0. More precisely, the metal casing H has an opening H0 on one side, while the other side is a closed surface, i.e., the bottom H1. In other words, the metal casing H is a casing structure with an opening on one side. The circuit board 1 is disposed inside the metal casing H and directly opposite the opening H0. The grounding metal part 2 and the feed metal part 3 are disposed on the circuit board 1.

[0056] See Figure 3 and Figure 5 As shown, Figure 5 for Figure 4 The reverse side diagram is shown. The feed metal section 3 has a ground terminal 31 and a feed terminal 32. The ground terminal 31 is connected to the ground metal section 2, and the feed terminal 32 is connected to a signal source (not shown). Therefore, the feed metal section 3 feeds a signal through the signal source to excite the metal housing H and generate an operating frequency. In the embodiments of the present invention, the operating frequency is between 2.4 and 2.5 GHz, but the present invention is not limited thereto. The first short-circuit metal section 4 has a first end 41 and a second end 42. The first end 41 is connected to the feed metal section 3, and the second end 42 is connected to the bottom H1 of the metal housing H. In this way, the antenna structure M of the present invention can achieve impedance matching through the design of the first short-circuit metal section 4. Furthermore, when the feed metal section 3 feeds a signal through the signal source, the first short-circuit metal section 4 is electrically connected to the metal housing H, so that the current can be evenly distributed in the metal housing H, thereby generating good antenna characteristics.

[0057] In addition, such as Figure 5As shown, the first short-circuit metal section 4 can divide the feed metal section 3 into a first section and a second section. The first section is the section of the feed metal section 3 between the feed end 32 and the first end 41 of the first short-circuit metal section 4, and the second section is the section of the feed metal section 3 between the ground end 31 and the first end 41 of the first short-circuit metal section 4. The length of the first section (the length between the feed end 32 and the first end 41) is less than the length of the second section (the length between the ground end 31 and the first end 41). That is, the first short-circuit metal section 4 is closer to the feed end 32 and farther from the ground end 31. Preferably, the length of the first section is less than 3 / 4 of the length of the feed metal section 3 (the sum of the first section and the second section). Preferably, the length of the feed metal section 3 is between 10 mm and 30 mm.

[0058] The antenna structure M further includes a second short-circuit metal portion 5 and a third short-circuit metal portion 6. One end of each of the second short-circuit metal portion 5 and the third short-circuit metal portion 6 is connected to the ground metal portion 2, and the other end is connected to the bottom H1 of the metal housing H. A resonant path P is generated between the second short-circuit metal portion 5 and the third short-circuit metal portion 6 along the contour of the metal housing H at the opening H0. The length of the resonant path P is between 0.3 and 0.7 times the wavelength of the operating frequency. Preferably, the length of the resonant path P is half the wavelength of the operating frequency. In other words, the operating frequency can be determined by the length of the resonant path P. Therefore, the antenna structure M of the present invention can adjust the operating frequency by changing the positions of the second short-circuit metal portion 5 and the third short-circuit metal portion 6 without changing the overall dimensions.

[0059] See Figure 6 As shown, Figure 6 This is a top view of the antenna structure according to the first embodiment of the present invention. For example, the grounding metal part 2 can be a copper foil laid on the surface of the circuit board 1, and the feed metal part 3 can be a ring-shaped metal wire or a copper foil, but the present invention is not limited thereto. The area on the circuit board 1 where the grounding metal part 2 is laid can be regarded as a wiring area, which can be used for circuit wiring and circuit component configuration. For example, an RF chip can be configured on the wiring area as a signal source, and the RF chip can be electrically connected to the feed terminal 32 of the feed metal part 3 through circuit wiring.

[0060] Furthermore, the area on circuit board 1 where the ground metal portion 2 is not laid can be considered a clearance area, and the feed metal portion 3 is disposed within this area. However, it should be noted that circuit components can also be configured in the area on circuit board 1 where the ground metal portion 2 is not laid. The feed metal portion 3 surrounds a receiving area C in the clearance area of ​​circuit board 1. More precisely, the receiving area C is the area between the feed metal portion 3 and the ground metal portion 2. A component B can be disposed in the receiving area C, and component B can be, for example, a metal button, which is not limited to this invention. There is a distance G between component B and the feed metal portion 3, preferably, the distance G is greater than 1 mm. Therefore, in this invention, the circuit board 1 of the antenna structure M is not limited to circuit wiring and circuit components being configured only in the wiring area, but components can also be configured within an appropriate range of the clearance area (receiving area C), thereby greatly increasing the space utilization of circuit board 1.

[0061] See Figure 7 As shown, Figure 7 This is a reverse view of the antenna structure according to a second embodiment of the present invention. The antenna structure M may further include at least one inductor component. At least one inductor component is connected between the second short-circuited metal portion 5 and the grounded metal portion 2, or between the third short-circuited metal portion 6 and the grounded metal portion 2, and the present invention is not limited to the number of at least one inductor component. In this embodiment, the antenna structure M includes a first inductor component 71 and a second inductor component 72. The first inductor component 71 is connected between the second short-circuited metal portion 5 and the grounded metal portion 2, while the second inductor component 72 is connected between the third short-circuited metal portion 6 and the grounded metal portion 2. In other words, in this embodiment, the grounded metal portion 2 does not directly contact the second short-circuited metal portion 5 and the third short-circuited metal portion 6, but is electrically connected to the second short-circuited metal portion 5 and the third short-circuited metal portion 6 through the first inductor component 71 and the second inductor component 72. Preferably, the inductance values ​​of the first inductor component 71 and the second inductor component 72 are between 0 nF and 15 nF. Therefore, the present invention can use the arrangement of the first inductor component 71 and the second inductor component 71 to appropriately adjust the operating frequency generated by the antenna structure M.

[0062] Next, refer to Figure 8 As shown, Figure 8 This is a schematic diagram of the antenna structure according to the third embodiment of the present invention. Figure 8 The feed metal portion 3 is U-shaped and is concentrated on one side of the clearance area of ​​the circuit board 1, allowing more space in the clearance area for other circuit components. Therefore, the antenna structure M of the present invention can significantly increase the space utilization on the circuit board 1 by means of the shape design of the feed metal portion 3 (e.g., the ring structure of the first embodiment and the U-shaped structure of the third embodiment).

[0063] In summary, the antenna structure M of the present invention, and the electronic device suitable for the antenna structure M, can generate the desired operating frequency by placing a circuit board 1 inside a metal housing H with an opening H0, and by placing a grounding metal part 2, a feed metal part 3, a first short-circuit metal part 4, a second short-circuit metal part 5, and a third short-circuit metal part 6 on the circuit board 1. Existing antenna structures typically utilize a metal housing as a reflector, resulting in a high directivity of the radiation pattern. Compared to the prior art, the antenna structure M of the present invention uses the metal housing H as the antenna radiator, thus exhibiting lower directivity and making it suitable for various application scenarios of electronic devices. Furthermore, in the present invention, the metal housing H and its opening H0 of the antenna structure M are integrally formed, thus possessing sufficient structural strength.

[0064] Furthermore, the antenna structure M of the present invention, through the electrical connection of the first short-circuited metal part 4 to the metal housing H, results in fewer dead zones in the radiation pattern generated by the antenna structure M, that is, the radiation pattern coverage of the antenna structure M is better. See also... Figures 9 to 11 As shown, Figure 9 This is a schematic diagram of the radiation pattern of the antenna structure of the present invention in the XZ plane. Figure 10 This is a schematic diagram of the radiation pattern of the antenna structure of the present invention in the YZ plane. Figure 11 This is a schematic diagram of the radiation pattern of the antenna structure of the present invention in the XY plane. The dashed line represents the radiation pattern generated by the prior art monopole antenna structure, and the solid line represents the radiation pattern generated by the antenna structure M of the present invention. Figures 9 to 11 As shown, the antenna structure M of the present invention has a significantly better field pattern coverage in the XZ and XY planes than that of existing antennas.

[0065] Furthermore, compared to existing slot antenna structures that require metal clearance areas to be formed on the upper and lower sides of the antenna, the antenna structure M of the present invention achieves good antenna performance by forming an opening H0 on only one side of the metal housing H (i.e., only a metal clearance area needs to be formed on one side of the metal housing H). In addition, since the antenna structure M of the present invention uses a ring-shaped feed metal part 3 to excite the metal housing H, circuit wiring and circuit components can be configured on both the upper and lower sides of the circuit board 1, thereby greatly increasing space utilization.

[0066] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. An antenna structure, characterized in that, include: A metal casing having an opening; A circuit board is disposed within the metal housing, and the circuit board is directly opposite the opening; A grounding metal part is disposed on the circuit board; the area on the circuit board where the grounding metal part is laid is the wiring area, and the area on the circuit board where the grounding metal part is not laid is the clearance area; A feed metal section is disposed on the circuit board. The feed metal section has a ground terminal and a feed terminal. The ground terminal is connected to the ground metal section, and the feed terminal is connected to a signal source. The feed metal portion forms a receiving area around the clearance area of ​​the circuit board, the receiving area being used to receive components; or, the feed metal portion is U-shaped, and the feed metal portion is concentrated on one side of the clearance area on the circuit board, the other side of the clearance area being used to configure components. A first short-circuit metal part has a first end and a second end, the first end being connected to the feed metal part and the second end being connected to the metal housing; as well as A second short-circuit metal part and a third short-circuit metal part, each of which has one end connected to the grounded metal part and the other end connected to the metal housing; The feeding metal section is used to feed a signal through the signal source to excite the metal housing to generate an operating frequency.

2. The antenna structure according to claim 1, characterized in that, The operating frequency is between 2.4 and 2.5 GHz.

3. The antenna structure according to claim 1, characterized in that, A resonant path is generated between the second short-circuit metal portion and the third short-circuit metal portion along the contour of the metal housing, the length of the resonant path being between 0.3 and 0.7 times the wavelength of the operating frequency.

4. The antenna structure according to claim 1, characterized in that, It also includes at least one inductor component, which is connected between the second short-circuited metal portion and the grounded metal portion or between the third short-circuited metal portion and the grounded metal portion.

5. The antenna structure according to claim 4, characterized in that, The inductance value of the at least one inductor component is between 0 nF and 15 nF.

6. The antenna structure according to claim 4, characterized in that, The at least one inductor component includes a first inductor component and a second inductor component, the first inductor component and the second inductor component being respectively connected between the second short-circuited metal portion and the grounded metal portion and between the third short-circuited metal portion and the grounded metal portion.

7. The antenna structure according to claim 1, characterized in that, The length of the feed metal portion between the feed end and the first end of the first short-circuit metal portion is less than the length of the feed metal portion between the ground end and the first end of the first short-circuit metal portion.

8. The antenna structure according to claim 7, characterized in that, The length between the feed end and the first end of the first short-circuit metal part is less than 3 / 4 times the length of the feed metal part.

9. The antenna structure according to claim 1, characterized in that, The distance between the component and the feed metal part is greater than 1 mm.

10. An electronic device, characterized in that, include: The antenna structure according to any one of claims 1 to 9; and A button cover is mounted on the antenna structure.

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