CN113839208A

CN113839208A - Mobile device and method for manufacturing the same

Info

Publication number: CN113839208A
Application number: CN202111018904.3A
Authority: CN
Inventors: 蔡调兴; 邱建评; 吴晓薇; 曾绅辅; 龚逸祥; 方俐媛
Original assignee: HTC Corp
Current assignee: HTC Corp
Priority date: 2016-12-21
Filing date: 2017-10-13
Publication date: 2021-12-24
Also published as: TW202224260A; DE102017130871B4; TWI758059B; TW202131549A; DE102017130871A1

Abstract

The invention discloses a mobile device and a manufacturing method thereof. The mobile device includes: the antenna comprises a first circuit board, a metal frame, an extension radiation part, an electronic component, a second circuit board and a radio frequency module. The first circuit board comprises a system ground plane. The metal frame comprises a first part, wherein the first part is coupled to the system ground plane. A clearance zone is formed between the first portion and the system ground plane. The first portion and the extended radiating portion are both coupled to a feed point. The first portion and the extended radiating portion together form an antenna structure. The second circuit board is coupled to the electronic component, wherein the electronic component and the second circuit board are both adjacent to the first portion. The radio frequency module is coupled to the feed point to excite the antenna structure.

Description

Mobile device and method for manufacturing the same

The application is a divisional application of Chinese invention patent application (application number: 201710951672.4, application date: 2017, 10 and 13 months, invention name: mobile device and manufacturing method thereof).

Technical Field

The present invention relates to a mobile device, and more particularly, to a mobile device and an antenna structure thereof.

Background

With the development of mobile communication technology, mobile devices have become increasingly popular in recent years, such as: portable computers, mobile phones, multimedia players and other portable electronic devices with mixed functions. To meet the demand of people, mobile devices usually have wireless communication functions. Some cover long-distance wireless communication ranges, such as: the mobile phone uses 2G, 3G, LTE (Long Term Evolution) system and its used frequency bands of 700MHz, 850MHz, 900MHz, 1800MHz, 1900MHz, 2100MHz, 2300MHz and 2500MHz for communication, while some cover short-distance wireless communication ranges, for example: Wi-Fi and Bluetooth systems use 2.4GHz and 5GHz frequency bands for communication.

In order to pursue the aesthetic appearance, designers nowadays often add elements of metal components to mobile devices. However, the added metal elements tend to adversely affect the antenna of the mobile device for providing wireless communication, thereby reducing the overall communication quality of the mobile device. Therefore, there is a need for a new mobile device and antenna structure to overcome the problems encountered in the conventional technology.

Disclosure of Invention

In a preferred embodiment, the present invention provides a mobile device comprising: a first circuit board including a system ground plane; a metal frame including a first portion, wherein the first portion is coupled to the system ground plane and a clearance is formed between the first portion and the system ground plane; an extended radiating portion, wherein the first portion and the extended radiating portion are both coupled to a feeding point, and the first portion and the extended radiating portion together form an antenna structure; an electronic component; a second circuit board coupled to the electronic component, wherein the electronic component and the second circuit board are both adjacent to the first portion; and a radio frequency module coupled to the feed-in point for exciting the antenna structure.

In some embodiments, the first portion has a first end and a second end, the first end of the first portion is coupled to a first shorting point on the system ground plane, and the second end of the first portion is coupled to a second shorting point on the system ground plane.

In some embodiments, the headroom is between the first and second shorting points.

In some embodiments, the metal bezel further includes a second portion, and the extended radiating portion is formed by the second portion.

In some embodiments, the first portion presents a straight bar shape.

In some embodiments, the extended radiating portion has an L-shape.

In some embodiments, a perpendicular projection of the extended radiating portion at least partially overlaps the second circuit board.

In some embodiments, a perpendicular projection of the extended radiating portion at least partially overlaps the clearance zone.

In some embodiments, the headroom region exhibits a narrow rectangle.

In some embodiments, the mobile device further comprises: a feeding connector coupled between the RF module and the feeding point.

In some embodiments, the second circuit board is also coupled to the system ground plane.

In some embodiments, the antenna structure covers a low frequency band between 2400MHz and 2500MHz and a high frequency band between 5150MHz and 5875 MHz.

In some embodiments, the low frequency band is excited by the first portion, and the high frequency band is excited by the extended radiating portion.

In some embodiments, the length of the first portion is equal to 0.5 wavelengths of the low frequency band.

In some embodiments, the extended radiating portion has a length equal to 0.25 wavelengths of the high frequency band.

In some embodiments, the electronic component includes a power key or/and a volume key.

In some embodiments, the power key and the volume key are both disposed outside of the first portion.

In some embodiments, the electronic component includes one or more sensing elements.

In some embodiments, the sensing elements are disposed inside the first portion.

In some embodiments, the first circuit board is a system circuit board, and the second circuit board is a flexible printed circuit board.

In a preferred embodiment, the present invention provides a method of manufacturing a mobile device, comprising the steps of: providing a first circuit board, a metal frame, an extended radiating part, an electronic component, a second circuit board and a radio frequency module, wherein the first circuit board comprises a system grounding surface, the metal frame comprises a first part, and the electronic component and the second circuit board are both adjacent to the first part; coupling the first portion to the system ground plane; forming a clearance region between the first portion and the system ground plane; coupling the first portion and the extended radiating portion to a feed point such that the first portion and the extended radiating portion together form an antenna structure; coupling the second circuit board to the electronic component; and coupling the radio frequency module to the feed-in point to excite the antenna structure.

In another preferred embodiment, the present invention provides a mobile device comprising: a first circuit board including a system ground plane; a metal frame including at least a first portion, wherein the first portion is electrically coupled to the system ground plane and a feeding point, and a clearance region is formed between the first portion and the system ground plane, wherein the first portion and the feeding point together form an antenna structure; an electronic component; a second circuit board electrically coupled to the electronic component, wherein the electronic component and the flexible printed circuit board are both adjacent to the first portion; and a radio frequency module electrically coupled to the feed-in point for exciting the antenna structure.

In another preferred embodiment, the present invention provides a method of manufacturing a mobile device, comprising the steps of: providing a system circuit board, a metal frame, an extension radiation part, an electronic component, a flexible printed circuit board and a radio frequency module, wherein the system circuit board comprises a system grounding surface, the metal frame comprises a first part, and the electronic component and the flexible printed circuit board are both adjacent to the first part; electrically coupling the first portion to the system ground plane; forming a clearance region between the first portion and the system ground plane; coupling the flexible printed circuit board to the electronic component; and electrically coupling the first portion and the extended radiating portion to a feed point, and coupling the rf module to the feed point, such that the first portion and the extended radiating portion are operable in a plurality of frequency bands.

Drawings

Fig. 1A is a rear view of a mobile device according to an embodiment of the invention;

FIG. 1B is a side view of a mobile device according to an embodiment of the invention;

fig. 2 is a rear view of an antenna structure of a mobile device according to an embodiment of the invention;

fig. 3 is a voltage standing wave ratio diagram of an antenna structure of a mobile device according to an embodiment of the invention;

FIG. 4A is a rear view of a mobile device according to an embodiment of the invention;

FIG. 4B is a side view of a mobile device according to an embodiment of the invention;

fig. 5 is a perspective view of a mobile device according to an embodiment of the invention;

fig. 6 is a perspective view of a mobile device according to an embodiment of the invention;

fig. 7 is a perspective view of a mobile device according to an embodiment of the invention;

fig. 8 is a perspective view of a mobile device according to an embodiment of the invention;

fig. 9 is a flowchart illustrating a method for manufacturing a mobile device according to an embodiment of the invention.

Description of the symbols

100. 400, 500, 600, 700, 800-mobile device;

110-a system circuit board;

112-system ground plane;

120-metal frame;

126-fracture of the metal frame;

130-a first portion of the metal bezel;

131-a first end of a first portion of the metal bezel;

132-a second end of the first portion of the metal bezel;

140-a second portion of the metal bezel;

150-an extended radiating section;

151-a first end of the extended radiating portion;

152-a second end of the extended radiating portion;

160. 460-electronic components;

161 power key;

162-volume key;

170-flexible printed circuit board;

171-flexible printed circuit board connector;

172. 173-bare copper area;

180-clearance interval;

185-display;

190-feeding in a connecting piece;

192-radio frequency signal lines;

199-radio frequency module;

461-sensing element;

501-a first position;

502 to a second position;

510-main lens;

520-nonmetal back cover;

525-boundary line;

620. 720, 820 to back cover;

621. 721, 821 to the metal part of the back cover;

622. 722, 723, 822, 823, 824 to the non-metallic portion of the back cover;

d1-a first spacing;

d2-second spacing;

FB 1-Low frequency band;

FB 2-high frequency band;

FP-feed point;

GP 1-first short circuit point;

GP2 second short circuit point;

w3 width.

Detailed Description

In order to make the objects, features and advantages of the present invention comprehensible, specific embodiments accompanied with figures are described in detail below.

Certain terms are used throughout the description and following claims to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. The present specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. The term "substantially" refers to a range of acceptable error within which one skilled in the art can solve the technical problem to achieve the basic technical result. In addition, the term "coupled" is used herein to encompass any direct or indirect electrical connection. Thus, if a first device couples to a second device, that connection may be through a direct electrical connection, or through an indirect electrical connection via other devices and connections.

Fig. 1A is a rear view of a mobile device 100 according to an embodiment of the invention. Fig. 1B is a side view of the mobile device 100 according to an embodiment of the invention. Fig. 2 is a rear view of an antenna structure of the mobile device 100 according to an embodiment of the invention (elements outside the antenna structure are temporarily hidden). Please refer to fig. 1A, fig. 1B, and fig. 2. The mobile device 100 may be a Smart Phone (Smart Phone), a Tablet Computer (Tablet Computer), or a Notebook Computer (Notebook Computer). In the embodiment of fig. 1A and 1B, the mobile device 100 at least includes: a System Circuit Board (System Circuit Board)110 (or referred to as "first Circuit Board"), a Metal Frame (Metal Frame)120, an Extension Radiation Element (Extension Radiation Element)150, an Electronic Component (Electronic Component)160, a Flexible Printed Circuit (FPC) 170 (or referred to as "second Circuit Board"), and a Radio Frequency Module (Radio Frequency Module) 199. It must be understood that, although not shown in fig. 1A, 1B, the mobile device 100 may also include other elements, such as: the device comprises a processor, a loudspeaker, a touch module, a power supply module and a shell.

The System circuit board 110 includes a System Ground Plane (System Ground Plane)112, which is made of a metal material. The system Ground plane 112 may be used to provide a Ground Voltage (Ground Voltage). The shapes and sizes of the system circuit board 110 and the system ground plane 112 are not particularly limited in the present invention, and may be adjusted according to various requirements. The metal bezel 120 may be an Appearance Element (Appearance Element) of the mobile device 100. The metal frame 120 includes at least a first portion 130, wherein the first portion 130 may be substantially in the shape of a straight strip. In detail, the first portion 130 has a first end 131 and a second end 132, wherein the first end 131 of the first portion 130 is coupled to a first short Point (Shorting Point) GP1 on the system ground plane 112, and the second end 132 of the first portion 130 is coupled to a second short Point GP2 on the system ground plane 112. A Clearance Region (Clearance Region)180 is formed between the first portion 130 of the metal bezel 120 and the system ground plane 112. In other embodiments, if the mobile device 100 further includes a display 185, the clearance 180 is defined between the first portion 130 of the metal frame 120 and the display 185. The clearance interval 180 may substantially exhibit an elongated rectangular shape and may be between the first short point GP1 and the second short point GP 2. The length of the headroom zone 180 is equal to or slightly less than the length of the first portion 130. The first portion 130 of the metal frame 120 is coupled to a Feeding Point (Feeding Point) FP, wherein the Feeding Point FP is between a first end 131 and a second end 132 of the first portion 130. The feed point FP is closer to the first short-circuit point GP1 than the second short-circuit point GP 2.

The extension radiation part 150 is made of a metal material. In some embodiments, the metal bezel 120 further includes a second portion 140, wherein the extended radiating portion 150 is formed by the second portion 140. That is, both the extended radiating portion 150 and the metal bezel 120 may be an integrally formed structure. In other embodiments, the metal frame 120 does not include the second portion 140, and the extended radiating portion 150 may be printed on another flexible printed circuit board or may be formed on a plastic supporting element by Laser Direct Structuring (LDS). The extended radiating portion 150 may have an L-shape. In other embodiments, the extended radiating portion 150 may have different shapes to meet different frequency requirements. In detail, the extended radiation portion 150 has a first End 151 and a second End 152, wherein the first End 151 of the extended radiation portion 150 is coupled to the feed point FP, and the second End 152 of the extended radiation portion 150 is an Open End (Open End) extending away from the first ground point GP 1. The extended radiating portion 150 may be partially parallel to the first portion 130 of the metal bezel 120 and partially perpendicular to the first portion 130 of the metal bezel 120. A Vertical Projection (Vertical Projection) of the extended radiating portion 150 may at least partially overlap the clearance 180. In addition, the vertical projection of the extended radiation part 150 may also at least partially overlap with the system ground plane 112. The first portion 130 of the metal bezel 130 and the extended radiating portion 150 together form an antenna structure. In other embodiments, the metal frame 130 of the mobile device 100 includes only the first portion 130 and does not include the second portion 140 (i.e., the antenna structure may not include the extended radiating portion 150), but may also perform similar functions as the original antenna structure (including both the first portion 130 and the second portion 140 or the extended radiating portion 150). The rf module 199 may be disposed on the system circuit board 110. The rf module 199 may be coupled to the feed point FP to excite the antenna structure. In some embodiments, the mobile device 100 further includes a Feeding Connection Element (Feeding Connection Element)190 and a rf signal line 192, wherein the Feeding point FP is coupled to the rf module 199 via the Feeding Connection Element 190 and the rf signal line 192. For example, the feeding connector 190 may be a three-dimensional connecting structure, such as implemented by a Pogo Pin (Pogo Pin), a Metal Spring (Metal Spring), or a Metal Screw (Metal screen). The first portion 130 and the second portion 140 of the metal frame 120 may be disposed at a Side (Side) of the mobile device 100, and the rest of the metal frame 120 may be selectively distributed at a top, a bottom, or (and) another Side of the mobile device 100, such that the entire metal frame 120 may substantially present a ring shape, and the system circuit board 110 may be disposed in the hollow interior of the metal frame 120.

In the embodiment of fig. 1A and 1B, the electronic component 160 may at least include a Power Button (Power Button)161 or a Volume Button (Volume Button)162, but the invention is not limited thereto. In other embodiments, the electronic component 160 may also include fewer or more physical keys or (and) slots with different functions. The flexible printed circuit board 170 is coupled to the power key 161 and the volume key 162 of the electronic component 160, wherein the electronic component 160 and the flexible printed circuit board 170 are both adjacent to the first portion 130 of the metal frame 120. For example, the power key 161 and the volume key 162 may be disposed at least partially outside the first portion 130 of the metal frame 120 (or alternatively, the power key 161 and the volume key 162 may partially extend to the inside of the first portion 130 of the metal frame 120), and the flexible printed circuit board 170 may be disposed inside the first portion 130 of the metal frame 120. Although not shown in fig. 1A and 1B, the first portion 130 of the metal frame 120 may have one or more openings (Opening) thereon, such that the electronic components 160 can be coupled to the flexible printed circuit board 170 through the openings. The flexible printed Circuit board 170 can also be used to carry Trace (Trace) and Circuit Layout (Circuit Layout) of control elements.

A vertical projection of the extended radiation portion 150 at least partially overlaps the flexible printed circuit board 170. For example, the vertical projection of the extended radiation portion 150 may be located completely inside the flexible printed circuit board 170. In some embodiments, the flexible printed circuit board 170 is also coupled to the system ground plane 112. For example, the flexible printed circuit 170 may further include a flexible printed circuit Connector (FPC Connector)171 and two Bare Copper areas (Bare Copper areas) 172 and 173, wherein the flexible printed circuit Connector 171 and the

Bare Copper areas

172 and 173 can penetrate through the system circuit board 110 and be coupled to the system ground plane 112. In detail, the bare copper area 172 may be adjacent to the first grounding point GP1, or coincide with the first grounding point GP 1; the bare copper area 173 may be adjacent to the second grounding point GP2 or coincident with the second grounding point GP 2. In this design, the electronic component 160 and the flexible printed circuit board 170 can be integrated with the antenna structure and can be regarded as an extension of the antenna structure, so that the existence of the electronic component 160 and the flexible printed circuit board 170 does not cause much interference to the radiation characteristics of the antenna structure.

In other embodiments, a metal layer (or a conductive material layer) in the fpc 170 may have a C-shape or an L-shape, and may extend along the outer edge of the clearance 180, and its vertical projection may at least partially overlap with the clearance 180.

In some embodiments, the mobile device 100 also includes one or more other antenna elements (not shown). The other antenna elements may be formed from the rest of the metal bezel 120 and may be located at a top or a bottom of the mobile device 100. Other antenna elements may also have one or more breaks. Other Antenna elements may be used as the primary Antenna (Main Antenna) of the mobile device 100. On the other hand, because the clearance 180 is small, the Antenna structure can be used as an Auxiliary Antenna (Antenna) of the mobile device 100 to improve the Antenna Diversity Gain (Antenna Diversity Gain) of the mobile device 100. For example, the first short point GP1 may be interposed between the antenna structure and the other antenna elements to enhance Isolation (Isolation) between the other antenna elements and the antenna structure.

Fig. 3 is a Voltage Standing Wave Ratio (VSWR) graph of the antenna structure of the mobile device 100 according to an embodiment of the invention, wherein the horizontal axis represents the operating frequency (MHz) and the vertical axis represents the VSWR. According to the measurement results shown in fig. 3, the antenna structure of the mobile device 100 can cover a low frequency band FB1 between 2400MHz and 2500MHz and a high frequency band FB2 between 5150MHz and 5875 MHz. . Thus, the mobile device 100 may support at least dual-band WLAN (Wireless Local Area networks)2.4GHz/5GHz (or Wi-Fi) operation. The above frequency ranges can also be adjusted according to different needs.

The antenna principles and element dimensions of the mobile device 100 may be as follows. The low frequency band FB1 can be generated by excitation of the first portion 130 of the metal bezel 120, and the high frequency band FB2 can be generated by excitation of the extended radiating portion 150 (or the second portion 140 of the metal bezel 120). The length of the first portion 130 (i.e., the length from the first end 131 to the second end 132, or the length from the first short-circuit point GP1 to the second short-circuit point GP2) may be substantially equal to 0.5 times the wavelength (λ/2) of the low frequency band FB 1. The length of the extended radiating portion 150 (i.e., the length from the first end 151 to the second end 152, or the length from the feed point FP to the second end 152) may be substantially equal to 0.25 times the wavelength (λ/4) of the high frequency band FB 2. The feed point FP and the first end 131 (or the first short point GP1) of the first portion 130 have a first distance D1 therebetween, and the feed point FP and the second end 132 (or the second short point GP2) of the first portion 130 have a second distance D2 therebetween, wherein a ratio (D2/D1) of the second distance D2 to the first distance D1 may be between about 4 and 5. For example, the first spacing D1 may be about 8.5mm, and the second spacing D2 may be about 35.5mm, but is not limited thereto. The width W3 of the clearance area 180 (i.e., the minimum distance between the first portion 130 of the metal bezel 120 and the system ground plane 112 or the display 185, wherein the distance between the system ground plane 112 and the metal bezel 120 may be greater than or equal to the distance between the display 185 and the metal bezel 120) can be used to adjust the Impedance Matching (Impedance Matching) and the Bandwidth (Bandwidth) of the antenna structure. If the width W3 of the clearance interval 180 is increased, the bandwidth of the low frequency band FB1 of the antenna structure is increased; on the contrary, if the width W3 of the headroom 180 is smaller, the bandwidth of the low frequency band FB1 of the antenna structure will be reduced. For example, width W3 may be about 1.5mm, but is not so limited. In addition, the impedance matching of the low frequency band FB1 can be further fine-tuned by changing the position of the feed point FP. The above size ranges are derived from a number of experimental results that optimize the operational performance of the antenna structure of the mobile device 100. According to the actual measurement results, the Radiation Efficiency (Radiation Efficiency) of the antenna structure of the mobile device 100 in the low frequency band FB1 and the high frequency band FB2 is above 13.6%, which can satisfy the application requirements of the general mobile communication device.

In the mobile device 100 of the present invention, since the metal frame 120 can be used as a Main Radiator (Main Radiator) of the antenna structure, the metal frame 120 can be effectively prevented from negatively affecting the communication quality of the antenna structure. Furthermore, the antenna structure can be integrated with the electronic components 160 (e.g., side buttons or (and) slots) and the flexible printed circuit board 170, and is matched with the narrow clearance 180, so as to reduce the overall antenna size (the conventional mobile device is difficult to arrange any antenna structure due to the insufficient clearance on the side). In addition, at least the first portion 130 of the metal frame 120 does not have any break (Cut Point), which can greatly improve the Robustness (Robustness) of the mobile device 100 and improve the product appearance. The invention can support communication technologies such as Wi-Fi and Multi-Input and Multi-Output (MIMO), and is suitable for various small-size and wide-band mobile communication devices.

Fig. 4A is a rear view showing a mobile device 400 according to an embodiment of the invention. Fig. 4B is a side view of the mobile device 400 according to an embodiment of the invention. Fig. 4A and 4B are similar to fig. 1A and 1B, except that an electronic component 460 of the mobile device 400 includes one or more Sensing elements (Sensing elements) 461, wherein the Sensing elements 461 and the fpc 170 are disposed inside the first portion 130 of the metal frame 120, and the Sensing elements 461 and the fpc 170 are coupled to each other. At this time, at least on the first portion 130 of the metal bezel 120, there may not be any opening designed due to the configuration of the sensing element 461. The sensing element 461 may be a Pressure Sensor (Pressure Sensor) for sensing a pressing state of a user on the first portion 130 of the metal frame 120. Similarly, the antenna structure can be integrated with the electronic components 460 and the fpc 170, and the narrow clearance area 180 is provided, so that the overall size of the antenna can be reduced. The remaining features of the mobile device 400 and the antenna structure of fig. 4A and 4B are similar to those of the mobile device 100 and the antenna structure of fig. 1A, 1B and 2, so that similar operation effects can be achieved in both embodiments.

Various other configurations (configurations) of the present invention are described in the following examples. It is to be understood that the drawings and descriptions are only exemplary and are not intended as a definition of the limits of the invention.

Fig. 5 is a perspective view illustrating a mobile device 500 according to an embodiment of the invention. In the embodiment of fig. 5, the mobile device 500 further includes a Main lens (Main Camera)510 and a Non-metal Back Cover (Non-metal Back Cover) 520. The main lens 510 is embedded in the non-metal back cover 520. As described above, the first portion 130 of the metal frame 120 may form an antenna structure (which may be located at a first position 501 or a second position 502), and the antenna structure may be integrated with the electronic component 160 (e.g., the

side buttons

161 and 162 or the sensing element 461) and the flexible printed circuit board. A Boundary (Boundary)525 between the non-metallic back cover 520 and the metallic bezel 120 is located at a back side of the mobile device 500. In other embodiments, the non-metallic back cover 520 may also extend from the back to the side of the mobile device 500 such that the boundary 525 between the non-metallic back cover 520 and the metallic bezel 120 is located at the side of the mobile device 500. The remainder of the metal bezel 120 (in addition to the first section 130 and the second section 140) may also have one or more breaks 126 to tune the impedance matching and resonant frequency of the other antenna elements.

Fig. 6 is a perspective view illustrating a mobile device 600 according to an embodiment of the invention. In the embodiment of FIG. 6, the mobile device 600 also includes a Back Cover (Back Cover) 620. As described above, the first portion 130 of the metal frame 120 may form an antenna structure (which may be located at the first position 501 or the second position 502), and the antenna structure may be integrated with the electronic component 160 (e.g., the

side buttons

161 and 162 or the sensing element 461) and the flexible printed circuit board. The back cover 620 includes a metal portion 621 and a non-metal portion 622, wherein the metal portion 621 has a substantially rectangular shape, and the non-metal portion 622 has a substantially annular shape, such that the metal portion 621 is completely surrounded by the non-metal portion 622. The non-metal portion 622 of the back cover 620 can prevent the metal portion 621 from directly contacting the first portion 130 of the metal bezel 120, so as to maintain good communication quality of the antenna structure.

Fig. 7 is a perspective view illustrating a mobile device 700 according to an embodiment of the invention. In the embodiment of fig. 7, the mobile device 700 further includes a back cover 720. As described above, the first portion 130 of the metal frame 120 may form an antenna structure (which may be located at the first position 501 or the second position 502), and the antenna structure may be integrated with the electronic component 160 (e.g., the

side buttons

161 and 162 or the sensing element 461) and the flexible printed circuit board. The back cover 720 includes a metal portion 721, a first non-metal portion 722, and a second non-metal portion 723, wherein the metal portion 721 is interposed between the first non-metal portion 722 and the second non-metal portion 723 and completely separates the first non-metal portion 722 and the second non-metal portion 723. The first non-metal portion 722 of the back cover 720 can prevent the metal portion 721 from directly contacting the first portion 130 of the metal frame 120, so as to maintain the good communication quality of the antenna structure. In some embodiments, the mobile device 700 employs a Spray and Coat Process to reduce the visual difference between the metal portion 721 and the first and second

non-metal portions

722, 723, thereby enhancing the appearance of the mobile device 700.

Fig. 8 is a perspective view illustrating a mobile device 800 according to an embodiment of the invention. In the embodiment of fig. 8, the mobile device 800 further includes a back cover 820. As described above, the first portion 130 of the metal frame 120 may form an antenna structure (which may be located at the first position 501 or the second position 502), and the antenna structure may be integrated with the electronic component 160 (e.g., the

side buttons

161 and 162 or the sensing element 461) and the flexible printed circuit board. The back cover 820 includes a metal portion 821, a first non-metal portion 822, a second non-metal portion 823, and a third non-metal portion 824, wherein the metal portion 821 is interposed between the first non-metal portion 822, the second non-metal portion 823, and the third non-metal portion 824. In detail, the metal part 821 may completely separate the first non-metal part 822, the second non-metal part 823, and the third non-metal part 824. The first non-metallic portion 822, the second non-metallic portion 823, and the third non-metallic portion 824 of the back cover 820 have different shapes compared to the embodiment of fig. 7. For example, the first non-metallic portion 822 may generally exhibit a U-shape, the second non-metallic portion 823 may generally exhibit a rectangular shape, and the third non-metallic portion 824 may generally exhibit an elongated, straight shape. The first non-metal part 822 of the back cover 820 can prevent the metal part 821 from directly contacting the first part 130 of the metal bezel 120, so as to maintain good communication quality of the antenna structure. In some embodiments, the mobile device 800 also employs a spray coating process to reduce visual differences between the metal portion 821 and the first, second, and third

non-metal portions

822, 823, 824, thereby enhancing the appearance consistency of the mobile device 800. It should be noted that the back cover and the metal frame may be the same component (formed integrally), or may be two separate components manufactured separately.

Fig. 9 is a flowchart illustrating a method for manufacturing a mobile device according to an embodiment of the invention. The manufacturing method comprises the following steps. In step S910, a first circuit board, a metal frame, an extended radiating portion, an electronic component, a second circuit board, and a radio frequency module are provided, wherein the first circuit board includes a system ground plane, the metal frame includes a first portion, and the electronic component and the second circuit board are both adjacent to the first portion. In step S920, the first portion is coupled to the system ground plane. In step S930, a clearance interval is formed between the first portion and the system ground plane. In step S940, the first portion and the extended radiating portion are both coupled to a feeding point, such that the first portion and the extended radiating portion together form an antenna structure. In step S950, the second circuit board is coupled to the electronic component. In step S960, the rf module is coupled to the feed point to excite the antenna structure. It should be understood that the above steps need not be performed in sequence, and that any one or more of the device features of fig. 1A-8 may be applied to the method of manufacturing the mobile device of fig. 9.

It is noted that the sizes, shapes, and frequency ranges of the above-described elements are not limitations of the present invention. The antenna designer can adjust these settings according to different needs. The mobile device and the manufacturing method of the present invention are not limited to the states illustrated in fig. 1A to 9. The present invention may include only any one or more features of any one or more of the embodiments of fig. 1A-9. In other words, not all illustrated features may be required to implement the mobile device and the method of manufacturing the same in the present invention.

Ordinal numbers such as "first," "second," "third," etc., in the specification and claims are not necessarily in sequential order, but are merely used to identify two different elements having the same name.

Although the present invention has been described in connection with the preferred embodiments, it is not intended to limit the scope of the invention, and one skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention.

Claims

1. A mobile device, comprising:

a first circuit board including a system ground plane;

a metal bezel comprising a first portion, wherein the first portion has an aperture, the first portion is coupled to the system ground plane and a feed point, and the first portion is located at a side of the metal bezel;

an electronic component at least partially disposed in the opening of the first portion of the metal bezel;

a second circuit board coupled to the electronic component and adjacent to the first portion of the metal frame; and

a radio frequency module coupled to the feed point for exciting the antenna structure;

wherein the second circuit board is coupled to the first circuit board;

wherein the rest part of the metal frame is provided with a plurality of fractures;

wherein the first portion of the metal frame does not have any break, and the break is not equal to the opening.

2. The mobile device of claim 1, wherein the first portion and the feed point form an antenna structure.

3. The mobile device of claim 1 wherein the first portion has a first end and a second end, the first end of the first portion being coupled to a first shorting point on the system ground plane and the second end of the first portion being coupled to a second shorting point on the system ground plane.

4. The mobile device of claim 3, further comprising:

a clearance zone formed between the first portion and the system ground plane and between the first short point and the second short point.

5. The mobile device of claim 2, wherein the antenna structure further comprises an extended radiating portion coupled to the feed point, wherein the extended radiating portion is formed from the second portion of the metal bezel, or is printed on a flexible printed circuit board, or is formed on a plastic support element by a laser engraving technique.

6. The mobile device of claim 5, wherein the first portion and the second portion are both disposed at the side edge.

7. The mobile device of claim 1, further comprising:

one or more other antenna elements formed from the remainder of the metal bezel and located at another side, top, or bottom of the mobile device.

8. The mobile device of claim 7, wherein the other antenna element further has the break.

9. The mobile device of claim 5, further comprising:

a clearance zone formed between the first portion and the system ground plane, wherein a vertical projection of the extended radiating portion at least partially overlaps the clearance zone or at least partially overlaps the second circuit board.

10. The mobile device of claim 1, further comprising:

the feed-in connecting piece is coupled between the radio frequency module and the feed-in point.

11. The mobile device of claim 1, wherein the second circuit board is further coupled to the system ground plane.

12. The mobile device of claim 1, wherein the electronic component is coupled to the second circuit board through the opening.

13. The mobile device of claim 5, wherein the antenna structure covers a low frequency band and a high frequency band, wherein the low frequency band is generated by the excitation of the first portion, and the high frequency band is generated by the excitation of the extended radiating portion.

14. The mobile device of claim 2, wherein the electronic component and the second circuit board are integrated with the antenna structure and considered as extensions of the antenna structure.

15. The mobile device as claimed in claim 1, wherein the electronic component comprises a power key, a volume key, or a slot.

16. The mobile device of claim 15, wherein the power key and the volume key are both disposed at least partially outside of the first portion.

17. The mobile device of claim 1, further comprising:

a back cover, wherein the back cover has a metal portion and a non-metal portion, the metal portion substantially takes on a rectangular shape, and the non-metal portion substantially takes on an annular shape such that the metal portion is completely surrounded by the non-metal portion.

18. The mobile device of claim 1, further comprising:

a back cover, wherein the back cover has a metal portion, a first non-metal portion, and a second non-metal portion, the metal portion being interposed between the first non-metal portion and the second non-metal portion and completely separating the first non-metal portion and the second non-metal portion.

19. The mobile device of claim 1, further comprising:

a back cover, wherein the back cover has a metal portion, a first non-metal portion, a second non-metal portion, and a third non-metal portion, the metal portion is interposed between the first non-metal portion, the second non-metal portion, and the third non-metal portion, the metal portion is capable of completely separating the first non-metal portion, the second non-metal portion, and the third non-metal portion.

20. The mobile device of claim 19, wherein the electronic component comprises one or more sensing elements disposed inside the metal bezel and proximate to the third non-metal portion of the back cover.

21. The mobile device as claimed in claim 1, wherein the electronic component comprises one or more sensing elements disposed inside the metal bezel at the side edge.