CN110875514A

CN110875514A - Mobile device

Info

Publication number: CN110875514A
Application number: CN201811018868.9A
Authority: CN
Inventors: 陈静雯; 张家豪
Original assignee: Wistron Neweb Corp
Current assignee: Wistron Neweb Corp
Priority date: 2018-09-03
Filing date: 2018-09-03
Publication date: 2020-03-10
Anticipated expiration: 2038-09-03
Also published as: CN110875514B

Abstract

A mobile device is provided. The mobile device includes: the metal back cover, the dielectric substrate, the grounding metal part, the first radiation part and the second radiation part; the metal back cover is provided with a slotted hole; the dielectric substrate is provided with a first surface and a second surface which are opposite, and the second surface of the dielectric substrate faces the slotted hole; the grounding metal part is coupled to the metal back cover and extends to the first surface of the dielectric substrate; the first radiation part is provided with a feed-in point and is arranged on the first surface of the medium substrate; a first vertical projection of the first radiation part on the metal back cover is at least partially overlapped with the slot, and a coupling gap is formed between the first radiation part and the grounding metal part; the second radiation part is arranged on the second surface of the medium substrate, and a second vertical projection of the second radiation part on the metal back cover is at least partially overlapped with the slotted hole; the first radiating part, the second radiating part and the slotted hole of the metal back cover jointly form an antenna structure. The invention has the advantages of small size, wide frequency band, high efficiency of high and low frequency antenna, high stability of the device and beautifying the appearance of the device.

Description

Mobile device

Technical Field

The present invention relates to a mobile device, and more particularly, to a mobile device and an antenna structure (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 hybrid-function portable electronic devices. To meet the demand of people, mobile devices generally have a function of wireless communication. Some cover long-range 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 frequency bands of 2.4GHz, 5.2GHz, and 5.8GHz 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 supporting wireless communication in the mobile device, 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.

Therefore, it is desirable to provide a mobile device to solve the above problems.

Disclosure of Invention

In a preferred embodiment, the present invention provides a mobile device, comprising: a metal back cover, the metal back cover having a slot; a dielectric substrate having a first surface and a second surface opposite to each other, wherein the second surface of the dielectric substrate faces the slot; a grounding metal part coupled to the metal back cover and extending to the first surface of the dielectric substrate; a first radiation part having a feed point and disposed on the first surface of the dielectric substrate, wherein a first vertical projection of the first radiation part on the metal back cover at least partially overlaps the slot, and a coupling gap is formed between the first radiation part and the grounding metal part; and a second radiation part disposed on the second surface of the dielectric substrate, wherein a second perpendicular projection of the second radiation part on the metal back cover at least partially overlaps the slot; wherein the first radiation part, the second radiation part and the slot of the metal back cover together form an antenna structure.

In some embodiments, the slot is a closed slot.

In some embodiments, the first orthogonal projection of the first radiating portion at least partially overlaps the second orthogonal projection of the second radiating portion.

In some embodiments, the grounding metal portion is a grounding copper foil.

In some embodiments, the first radiating portion has a T-shape.

In some embodiments, the second radiating portion has a T-shape.

In some embodiments, the mobile device further comprises: and a first through element penetrating through the dielectric substrate, wherein the first through element is coupled between the first radiation part and the second radiation part.

In some embodiments, the mobile device further comprises: a third radiation part coupled to the first radiation part and disposed on the first surface of the dielectric substrate, wherein a third vertical projection of the third radiation part on the metal back cover at least partially overlaps the slot.

In some embodiments, the third radiating portion has a rectangular shape.

In some embodiments, the antenna structure covers a first frequency band between 2400MHz and 2500MHz and a second frequency band between 5150MHz and 5850 MHz.

In some embodiments, the first radiating portion, the second radiating portion, the third radiating portion, and the slot of the metal back cover are used for exciting the first frequency band.

In some embodiments, the first radiating portion, the second radiating portion, and the third radiating portion are configured to excite the second frequency band.

In some embodiments, the length of the slot is equal to 0.5 times the wavelength of the first frequency band.

In some embodiments, the second radiating portion is floating and has an L-shape.

In some embodiments, the grounding metal portion has an extension portion on the first surface of the dielectric substrate, and the extension portion has a straight strip shape or an L-shape.

In some embodiments, the coupling gap formed between the first radiating portion and the extension portion of the ground metal portion is less than 3.5 mm.

In some embodiments, the mobile device further comprises: a fourth radiation part disposed on the second surface of the dielectric substrate, wherein a fourth vertical projection of the fourth radiation part on the metal back cover at least partially overlaps the slot.

In some embodiments, the fourth radiating portion has an inverted T-shape.

In some embodiments, the mobile device further comprises: and a second through element penetrating the dielectric substrate, wherein the second through element is coupled between the extending portion of the grounding metal portion and the fourth radiation portion.

In some embodiments, the dielectric substrate has a thickness of less than 0.8 mm.

Compared with the traditional design, the invention at least has the advantages of small size, wide frequency band, high-low frequency antenna efficiency, device stability increase and device appearance beautification, so the invention is suitable for various mobile communication devices.

Drawings

FIG. 1A shows a top view of a mobile device according to an embodiment of the invention.

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

FIG. 2A is a diagram illustrating a mobile device operating in a notebook mode according to an embodiment of the invention.

Fig. 2B is a schematic diagram illustrating the mobile device operating in the tablet mode according to an embodiment of the invention.

Fig. 3A is a voltage standing wave ratio diagram of an antenna structure of a mobile device in a notebook mode according to an embodiment of the invention.

Fig. 3B is a schematic diagram illustrating a voltage standing wave ratio of the antenna structure when the mobile device is operating in the tablet mode according to an embodiment of the invention.

Fig. 4 shows a top view of a mobile device according to an embodiment of the invention.

Fig. 5 shows a top view of a mobile device according to an embodiment of the invention.

Fig. 6 shows a top view of a mobile device according to an embodiment of the invention.

Fig. 7 shows a top view of a mobile device according to an embodiment of the invention.

Fig. 8 shows a top view of a mobile device according to an embodiment of the invention.

Description of the main element symbols:

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

110 metal back cover

120 slotted hole

First closed end of 121 slotted hole

Second closed end of 122 slot

130 dielectric substrate

140. 740 ground metal part

145. 745 extension part of the grounding metal part

150 first radiation part

151 first end of the first radiating portion

152 second end of the first radiating portion

153 third end of the first radiating part

160. 560 second radiation part

161. 561 first end of second radiation part

162. 562 a second end of the second radiating part

163 third end of the second radiation part

170 third radiation part

181 first through element

182 second pass-through member

190 plastic support member

199 Signal Source

860 fourth radiation part

861 first end of fourth radiation part

862 second end of the fourth radiation portion

863 a third end of the fourth radiation part

First surface of E1 dielectric substrate

Second surface of E2 dielectric substrate

FB1 first frequency band

FB2 second frequency band

FP feed-in point

GC1, GC2 coupling gap

Height H1

TK1 thickness

Width of W1

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" means within an acceptable error range, within which a person 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 shows a top view of a mobile device 100 according to an embodiment of the invention. FIG. 1B shows a side view of the mobile device 100 according to an embodiment of the invention. Please refer to fig. 1A and fig. 1B together. 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, 1B, the mobile device 100 comprises: a metal back Cover (metal back Cover)110, a Dielectric Substrate (Dielectric Substrate)130, a grounded metal Element (grounded metal Element)140, a first Radiation Element (Radiation Element)150, a second Radiation Element 160, and a third Radiation Element 170, wherein the first Radiation Element 150, the second Radiation Element 160, and the third Radiation Element 170 are made of metal materials, such as: copper, silver, aluminum, iron, or alloys thereof. It must be understood that although not shown in fig. 1A, 1B, in practice the mobile device 100 may also comprise other elements, such as: a Processor (Processor), a touch Panel (touch control Panel), a Speaker (Speaker), a Battery Module (Battery Module), and a Housing (Housing).

The metal back cover 110 has a Slot (Slot)120, wherein the Slot 120 may be a substantially straight strip-shaped opening. In detail, the Slot 120 is a Closed Slot (Closed Slot) having a first Closed End (Closed End)121 and a second Closed End 122 which are far away from each other. However, the present invention is not limited thereto. In other embodiments, the Slot 120 may be a Monopole Slot (Open Slot) having an Open End and a closed End that are far away from each other. If the mobile device 100 is implemented in a notebook computer or a deformable device, an edge of the metal back cover 110 may be adjacent to a Hinge Element (not shown) of the notebook computer or the deformable device. For example, the spacing between the edge of the metal back cover 110 and the hinge member may be less than 10 mm.

The dielectric substrate 130 may be an FR4 (film resistor 4) substrate, a Printed Circuit Board (PCB), or a Flexible Circuit Board (FCB). The dielectric substrate 130 has a first surface E1 and a second surface E2 opposite to each other, wherein the first radiation portion 150 and the third radiation portion 170 are disposed on the first surface E1 of the dielectric substrate 130, and the second radiation portion 160 is disposed on the second surface E2 of the dielectric substrate 130. The second surface E2 of the dielectric substrate 130 may also face and be adjacent to the slot 120 of the metal back cover 110, so that the first radiating portion 150, the second radiating portion 160, the third radiating portion 170, and the slot 120 of the metal back cover 110 may together form an Antenna Structure (Antenna Structure). It should be noted that the term "adjacent" or "adjacent" in this specification may refer to a distance between two corresponding elements being less than a predetermined distance (e.g., 5mm or less), and may also include a case where two corresponding elements are in direct contact with each other (i.e., the distance is shortened to 0 mm). The grounding metal portion 140 may be coupled to the metal back cover 110, and both of them may provide a Ground Voltage (Ground Voltage) of the mobile device 100. For example, the grounding metal part 140 may be a grounding Copper Foil (Ground Copper Foil), which may extend from the metal back cover 110 to the first surface E1 of the dielectric substrate 130. In detail, the grounding metal part 140 has an extending portion 145 on the first surface E1 of the dielectric substrate 130, wherein the extending portion 145 of the grounding metal part 140 may be substantially in the shape of a straight strip. As shown in fig. 1B, the mobile device 100 may further include a Plastic Supporting Element (Plastic Supporting Element)190, wherein the Plastic Supporting Element 190 may be disposed on the metal back cover 110 and may be used for Supporting and fixing the dielectric substrate 130. The shape and size of the plastic support member 190 are not particularly limited in the present invention. It should be understood that the plastic support Element 190 is an Optional Element (Optional Element), and may be removed in other embodiments.

The first radiating portion 150 has a feed point FP, which can be coupled to a Positive Electrode (Positive Electrode) of a Signal Source (Signal Source)199, and a Negative Electrode (Negative Electrode) of the Signal Source 199 can be coupled to the grounding metal portion 140. For example, the signal source 199 can be a Radio Frequency (RF) module, which can be used to generate a transmit signal or process a receive signal to excite the antenna structure. In some embodiments, the positive pole of the signal source 199 is coupled to the feed point FP via a Central Conductive Line (Central Conductive Line) of a Coaxial Cable (Coaxial Cable), and the negative pole of the signal source 199 is coupled to the ground metal 140 via a Conductive Housing (Conductive Housing) of the Coaxial Cable. The first radiation part 150 extends across the slot 120 of the metal back cover 110. That is, a first Vertical Projection (Vertical Projection) of the first radiation part 150 on the metal back cover 110 at least partially overlaps the slot 120. In some embodiments, the first radiating portion 150 generally exhibits a T-shape. In detail, the first radiation portion 150 has a first end 151, a second end 152, and a third end 153, wherein the feed point FP is located at the first end 151 of the first radiation portion 150, and the second end 152 and the third end 153 of the first radiation portion 150 may extend in substantially opposite directions. The first radiation part 150 may also have a non-uniform width structure. For example, the width of the third end 153 of the first radiation part 150 may be greater than the width of the second end 152 of the first radiation part 150 to fine tune Impedance Matching (Impedance Matching) of the antenna structure. In addition, a Coupling Gap (Coupling Gap) GC1 may be formed between the third end 153 of the first radiating portion 150 and the extension portion 145 of the grounding metal portion 140.

The second radiation part 160 extends across the slot 120 of the metal back cover 110. That is, a second perpendicular projection of the second radiation portion 160 on the metal back cover 110 at least partially overlaps the slot 120. In addition, the first vertical projection of the first radiation portion 150 also at least partially overlaps the second vertical projection of the second radiation portion 160. In some embodiments, the second radiating portion 160 substantially exhibits a T-shape. In detail, the second radiation portion 160 has a first end 161, a second end 162, and a third end 163, wherein the second end 162 and the third end 163 of the second radiation portion 160 may extend in substantially opposite directions. The second radiation part 160 may also have a non-uniform width structure. For example, the width of the second end 162 of the second radiation part 160 may be greater than the width of the third end 163 of the second radiation part 160 to fine-tune Impedance Matching (Impedance Matching) of the antenna structure.

In some embodiments, the mobile device 100 further includes at least one first through Element (Via Element)181 made of a metal material, wherein the first through Element 181 penetrates the dielectric substrate 130 and is coupled between the first end 151 of the first radiation portion 150 and the first end 161 of the second radiation portion 160. It should be understood that the first through-hole element 181 is an optional element, and may be removed in other embodiments. If there is the first through element 181, the second radiation portion 160 is directly excited by the signal source 199; if there is no first through-element 181, the second radiation portion 160 is excited by the first radiation portion 150. The two excitation modes do not affect the radiation performance of the antenna structure. In some embodiments, the mobile device 100 further includes at least one second through via 182 made of a metal material, wherein the second through via 182 penetrates the dielectric substrate 130 and is coupled to the extension portion 145 of the grounding metal portion 140. It should be understood that the second through member 182 is also an optional member and may be removed in other embodiments. In addition, the number of the first and second through

members

181, 182 may also be adjusted according to different needs.

The third radiation part 170 extends across the slot 120 of the metal back cover 110. That is, a third perpendicular projection of the third radiation portion 170 on the metal back cover 110 at least partially overlaps the slot 120. In addition, the third vertical projection of the third radiation part 170 also at least partially overlaps the second vertical projection of the second radiation part 160. In some embodiments, the third radiating portion 170 generally exhibits a rectangular shape. The third radiation part 170 is coupled to the second end 152 of the first radiation part 150 to provide an additional Current Path (Current Path) and increase an Operation Bandwidth of the antenna structure. It should be understood that the third radiation portion 170 is an optional element, and may be removed in other embodiments.

Overall, the grounding metal portion 140, the first radiation portion 150, the second radiation portion 160, and the third radiation portion 170 are closer to the second closed end 122 of the slot 120 and farther from the first closed end 121 of the slot 120. That is, the grounding metal portion 140, the first radiation portion 150, the second radiation portion 160, and the third radiation portion 170 are all between the center point of the slot 120 and the second closed end 122, but not between the center point of the slot 120 and the first closed end 121. In addition, each of the first radiation portion 150, the second radiation portion 160, and the third radiation portion 170 may extend across the entire width W1 of the slot 120. Such an arrangement of elements optimizes the impedance matching of the antenna structure based on actual measurements.

In some embodiments, the mobile device 100 and the antenna structure thereof are implemented in a deformable device (DeformableDevice) that can switch between a Notebook Mode (notepad Mode) and a Tablet Mode (Tablet Mode). FIG. 2A is a diagram illustrating the mobile device 100 operating in a notebook mode according to an embodiment of the invention. Fig. 2B is a schematic diagram illustrating the mobile device 100 operating in the tablet mode according to an embodiment of the invention.

Fig. 3A is a Voltage Standing Wave Ratio (VSWR) diagram of the antenna structure when the mobile device 100 operates in the notebook mode according to an embodiment of the invention. Fig. 3B is a voltage standing wave ratio diagram of the antenna structure when the mobile device 100 operates in the tablet mode according to an embodiment of the invention. According to the measurement results shown in fig. 3A and 3B, the antenna structure of the mobile device 100 can cover a first frequency band FB1 and a second frequency band FB2 both in the notebook mode and the tablet mode, wherein the first frequency band FB1 can be approximately between 2400MHz and 2500MHz, and the second frequency band FB2 can be approximately between 5150MHz and 5850 MHz. Thus, the antenna structure of the mobile device 100 can support at least 2.4GHz/5GHz broadband operation for Bluetooth and WLAN (Wireless Local Area network). According to the actual measurement results, the antenna structure of the mobile device 100 has an antenna efficiency (antenna efficiency) in the first frequency band FB1 of about-3.5 dB, and an antenna efficiency in the second frequency band FB2 of about-4.09 dB, which can meet the practical application requirements of the general mobile communication device.

In some embodiments, the principles of operation of the antenna structure of the mobile device 100 may be as follows. The first radiation portion 150, the second radiation portion 160, the third radiation portion 170, and the slot 120 of the metal back cover 110 are excited together to generate the first frequency band FB 1. On the other hand, the first radiation portion 150, the second radiation portion 160, and the third radiation portion 170 are excited together to generate the second frequency band FB 2.

In some embodiments, the dimensions of the elements of the mobile device 100 may be as follows. The length of the slot 120 (i.e., the length from the first closed end 121 to the second closed end 122) may be substantially equal to 0.5 times the wavelength (λ/2) of the first frequency band FB 1. A length from the first end 151 of the first radiating portion 150 to any edge of the third radiating portion 170 through the second end 152 may be substantially equal to 0.25 times the wavelength (λ/4) of the first frequency band FB 1. A length from the first end 151 to the third end 153 of the first radiation part 150 may be substantially equal to 0.25 times the wavelength (λ/4) of the aforementioned second frequency band FB 2. A length from the first end 161 to the second end 162 of the second radiation part 160 may be substantially equal to 0.25 times the wavelength (λ/4) of the aforementioned first frequency band FB 1. A length from the first end 161 to the third end 163 of the second radiation part 160 may be substantially equal to 0.25 times the wavelength (λ/4) of the aforementioned second frequency band FB 2. In order to enhance the coupling effect between the elements, the width of the coupling gap GC1 may be less than 3.5mm, the thickness TK1 of the dielectric substrate 130 (or the spacing between the first surface E1 and the second surface E2) may be less than 0.8mm, and the height H1 of the plastic support element 190 (or the spacing between the second radiation part 160 and the metal back cover 110) may be between 2mm and 3 mm. The above element size ranges are found from multiple experimental results, which help to optimize the operating frequency band and impedance matching of the antenna structure of the mobile device 100.

The following embodiments will describe various configurations of the proposed antenna structure, but the drawings and descriptions are only illustrative and not intended to limit the scope of the present invention.

Fig. 4 shows a top view of a mobile device 400 according to an embodiment of the invention. Fig. 4 is similar to fig. 1A. In the embodiment of FIG. 4, the mobile device 400 does not include the first and second pass-through

members

181, 182. With this design, the second radiation portion 160 can still be excited by the first radiation portion 150 without affecting the radiation performance of the antenna structure. The remaining features of the mobile device 400 of fig. 4 are similar to those of the mobile device 100 of fig. 1A and 1B, so that similar operations can be achieved in both embodiments.

Fig. 5 shows a top view of a mobile device 500 according to an embodiment of the invention. Fig. 5 is similar to fig. 1A. In the embodiment of fig. 5, the mobile device 500 does not include the first through-member 181 and the second through-member 182, and a second radiating portion 560 of the mobile device 500 is Floating and substantially has an L-shape. The second radiation part 560 may be partially parallel to the slot 120 and partially perpendicular to the slot 120. In detail, the second radiation portion 560 has a first End 561 and a second End 562, which are both Open ends (Open ends), and the second End 562 of the second radiation portion 560 is covered by the vertical projection of the extension portion 145 of the grounding metal portion 140. The length of the second radiating portion 560 (i.e., the length from the first end 561 to the second end 562) may be substantially equal to 0.5 times the wavelength (λ/2) of the first frequency band FB 1. The shape and length adjustment of the second radiating portion 560 may be used to increase the bandwidth of the first frequency band FB1 of the antenna structure of the mobile device 500 according to actual measurement results. The remaining features of the mobile device 500 of fig. 5 are similar to those of the mobile device 100 of fig. 1A and 1B, so that similar operations can be achieved in both embodiments.

Fig. 6 shows a top view of a mobile device 600 according to an embodiment of the invention. Fig. 6 is similar to fig. 1A. In the embodiment of fig. 6, the moving device 600 does not include the first through member 181, the second through member 182, and the third radiation part 170. With this design, the first frequency band FB1 can still be generated by the first radiation portion 150, the second radiation portion 160, and the slot 120 of the metal back cover 110, without affecting the radiation performance of the antenna structure. The length from the first end 151 to the second end 152 of the first radiating part 150 may be substantially equal to 0.25 times the wavelength (λ/4) of the second frequency band FB2, so as to increase the bandwidth of the second frequency band FB 2. The remaining features of the mobile device 600 of fig. 6 are similar to those of the mobile device 100 of fig. 1A and 1B, so that similar operations can be achieved in both embodiments.

Fig. 7 shows a top view of a mobile device 700 according to an embodiment of the invention. FIG. 7 is similar to FIG. 1A; in the embodiment of fig. 7, a grounding metal part 740 of the mobile device 700 has an extending portion 745 on the first surface E1 of the dielectric substrate 130, wherein the extending portion 745 of the grounding metal part 740 can substantially have an L-shape, such that the second closed end 122 of the slot 120 is completely covered by the vertical projection of the extending portion 745. A coupling gap GC2 may be further formed between the third end 153 of the first radiation part 150 and the extension 745 of the ground metal part 740, wherein the width of the coupling gap GC2 may be less than 3.5 mm. According to the actual measurement results, an L-shaped extension 745 may be used to increase the bandwidth of the aforementioned second frequency band FB 2. The remaining features of the mobile device 700 of fig. 7 are similar to those of the mobile device 100 of fig. 1A and 1B, so that similar operations can be achieved in both embodiments.

Fig. 8 shows a top view of a mobile device 800 according to an embodiment of the invention. Fig. 8 is similar to fig. 1A. In the embodiment of fig. 8, the mobile device 800 further includes a fourth radiation portion 860 made of a metal material. The fourth radiation portion 860 is disposed on the second surface E2 of the dielectric substrate 130. The fourth radiation portion 860 extends across the slot 120 of the metal back cover 110. That is, a fourth vertical projection of the fourth radiation portion 860 on the metal back cover 110 at least partially overlaps the slot 120. The fourth radiation portion 860 is substantially shaped like an inverted T. In detail, the fourth radiation portion 860 has a first end 861, a second end 862, and a third end 863, which are open ends, and the second end 862 and the third end 863 of the fourth radiation portion 860 may extend in substantially opposite directions. The fourth radiation portion 860 may have an equal width structure. For example, the first end 861, the second end 862, and the third end 863 of the fourth radiating portion 860 may all have equal widths. A length from first end 861 to second end 862 of fourth radiating portion 860 may be greater than a length from first end 861 to third end 863 of fourth radiating portion 860. In some embodiments, at least one second through via 182 penetrates the dielectric substrate 130, wherein the second through via 182 is coupled between the extension portion 145 of the ground metal part 140 and the fourth radiation part 860. According to the actual measurement result, the addition of the fourth radiation section 860 can simultaneously increase the bandwidths of the aforementioned first and second frequency bands FB1 and FB 2. It should be understood that the second through-member 182 is also an optional member, and may be removed in other embodiments (in this case, the fourth radiation portion 860 is floating). The remaining features of the mobile device 800 of fig. 8 are similar to those of the mobile device 100 of fig. 1A and 1B, so that similar operations can be achieved in both embodiments.

The invention provides a novel antenna structure, which comprises a slotted hole, and when the antenna structure is applied to a mobile device with a metal back cover, the metal back cover can be regarded as an extension part of the antenna structure, so that the metal back cover can be effectively prevented from generating negative influence on the communication quality of the mobile device. When the mobile device is a deformable device, the antenna structure can exert good radiation performance no matter the mobile device is operated in a notebook mode or a tablet mode. It should be noted that the present invention can further improve the design of the mobile device without digging any Antenna Window (Antenna Window) on the metal back cover. Compared with the traditional design, the invention at least has the advantages of small size, wide frequency band, high-low frequency antenna efficiency, device stability increase and device appearance beautification, so the invention is suitable for various mobile communication devices.

It is noted that the sizes, shapes and frequency ranges of the above-mentioned components are not limitations of the present invention. The antenna designer can adjust these settings according to different needs. The mobile device and the antenna structure of the present invention are not limited to the states illustrated in fig. 1 to 8. The present invention may include only any one or more features of any one or more of the embodiments of fig. 1-8. In other words, not all illustrated features may be implemented in the mobile device and antenna structure of the present invention.

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

Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention.

Claims

1. A mobile device, comprising:

a metal back cover, the metal back cover having a slot;

a dielectric substrate having a first surface and a second surface opposite to each other, wherein the second surface of the dielectric substrate faces the slot;

a grounding metal part coupled to the metal back cover and extending to the first surface of the dielectric substrate;

a first radiation part having a feed point and disposed on the first surface of the dielectric substrate, wherein a first vertical projection of the first radiation part on the metal back cover at least partially overlaps the slot, and a coupling gap is formed between the first radiation part and the grounding metal part; and

a second radiation part disposed on the second surface of the dielectric substrate, wherein a second vertical projection of the second radiation part on the metal back cover at least partially overlaps the slot;

wherein the first radiation part, the second radiation part and the slot of the metal back cover together form an antenna structure.

2. The mobile device as claimed in claim 1, wherein the slot is a closed slot.

3. The mobile device of claim 1, wherein the first orthogonal projection of the first radiating portion at least partially overlaps the second orthogonal projection of the second radiating portion.

4. The mobile device of claim 1, wherein the grounding metal portion is a grounding copper foil.

5. The mobile device of claim 1, wherein the first radiating portion has a T-shape.

6. The mobile device of claim 1, wherein the second radiating portion has a T-shape.

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

and a first through element penetrating through the dielectric substrate, wherein the first through element is coupled between the first radiation part and the second radiation part.

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

a third radiation portion coupled to the first radiation portion and disposed on the first surface of the dielectric substrate, wherein a third vertical projection of the third radiation portion on the metal back cover at least partially overlaps the slot.

9. The mobile device of claim 8, wherein the third radiating portion has a rectangular shape.

10. The mobile device of claim 8, wherein the antenna structure covers a first frequency band between 2400MHz and 2500MHz and a second frequency band between 5150MHz and 5850 MHz.

11. The mobile device according to claim 10, wherein the first radiation portion, the second radiation portion, the third radiation portion, and the slot of the metal back cover are used to excite the first frequency band.

12. The mobile device as claimed in claim 10, wherein the first radiation portion, the second radiation portion, and the third radiation portion are used to excite the second frequency band.

13. The mobile device as claimed in claim 10, wherein the length of the slot is equal to 0.5 times the wavelength of the first frequency band.

14. The mobile device as claimed in claim 1, wherein the second radiating portion is floating and has an L-shape.

15. The mobile device as claimed in claim 1, wherein the grounding metal portion has an extension portion on the first surface of the dielectric substrate, and the extension portion has a straight bar shape or an L-shape.

16. The mobile device of claim 15, wherein the coupling gap formed between the first radiating portion and the extended portion of the grounding metal portion is less than 3.5 mm.

17. The mobile device of claim 15, further comprising:

a fourth radiation part disposed on the second surface of the dielectric substrate, wherein a fourth vertical projection of the fourth radiation part on the metal back cover at least partially overlaps the slot.

18. The mobile device as claimed in claim 17, wherein the fourth radiating portion has an inverted T-shape.

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

and a second through via element penetrating the dielectric substrate, wherein the second through via element is coupled between the extending portion of the grounding metal portion and the fourth radiation portion.

20. The mobile device of claim 1, wherein the dielectric substrate has a thickness of less than 0.8 mm.