CN111786134B

CN111786134B - Mobile device and antenna structure

Info

Publication number: CN111786134B
Application number: CN201910271148.1A
Authority: CN
Inventors: 魏仕强
Original assignee: Wistron Neweb Corp
Current assignee: Wistron Neweb Corp
Priority date: 2019-04-04
Filing date: 2019-04-04
Publication date: 2022-02-22
Anticipated expiration: 2039-04-04
Also published as: CN111786134A

Abstract

Mobile devices and antenna structures. The mobile device comprises a metal machine component, a ground plane, a first parasitic radiation part, a second parasitic radiation part, a feed radiation part and a dielectric substrate; the metal machine component has a slot, wherein the slot has first and second closed ends; the first parasitic radiation part and the second parasitic radiation part are both coupled to the metal machine component and both extend across the slot; the feed-in radiation part is provided with a feed-in point, wherein the feed-in radiation part is arranged between the first parasitic radiation part and the second parasitic radiation part; the medium substrate is adjacent to the metal machine component, and the feed-in radiation part, the first parasitic radiation part and the second parasitic radiation part are arranged on the medium substrate; the feed-in radiation part, the first parasitic radiation part, the second parasitic radiation part and the slotted hole of the metal machine component form an antenna structure together; the antenna structure covers at least one first frequency band, and the length of the slot is less than 0.48 times of the wavelength of the first frequency band. The invention has the advantages of small size, wide frequency band, beautifying the appearance of the mobile device and the like, and is suitable for being applied to various mobile communication devices.

Description

Mobile device and antenna structure

Technical Field

The present disclosure relates to mobile devices, and 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 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 and an antenna structure to solve the above problems.

Disclosure of Invention

In a preferred embodiment, the present invention provides a mobile device, comprising: a metal machine component having a slot, wherein the slot has a first closed end and a second closed end; a ground plane; a first parasitic radiation part coupled to the metal machine component and extending across the slot; a second parasitic radiation part coupled to the metal machine component and extending across the slot; a feed-in radiation part having a feed-in point, wherein the feed-in radiation part is disposed between the first parasitic radiation part and the second parasitic radiation part; the medium substrate is adjacent to the metal machine component, and the feed-in radiation part, the first parasitic radiation part and the second parasitic radiation part are all arranged on the medium substrate; wherein the feed-in radiation part, the first parasitic radiation part, the second parasitic radiation part and the slot of the metal machine component form an antenna structure together; the antenna structure covers at least one first frequency band, and the length of the slot is less than 0.48 times of the wavelength of the first frequency band.

In some embodiments, the ground plane is made of a conductive material and extends from the metal component to the dielectric substrate, and the ground plane and the first parasitic radiation portion or the second parasitic radiation portion extend at least partially in opposite directions.

In some embodiments, the antenna structure has an asymmetric pattern.

In some embodiments, the feeding radiating part has a non-uniform width structure.

In some embodiments, the slot is between a first side region where a first end of the first parasitic radiating portion and a first end of the second parasitic radiating portion are coupled to the metal machine component and a second side region where the feed point is located, and a second end of the first parasitic radiating portion and a second end of the second parasitic radiating portion both cross the slot and extend to the second side region.

In some embodiments, each of the first parasitic radiating portion and the second parasitic radiating portion at least partially presents a U shape, and the feeding radiating portion is at least partially disposed between an opening side of the first parasitic radiating portion and an opening side of the second parasitic radiating portion.

In some embodiments, the first parasitic radiating portion further includes a protruding portion, and the protruding portion has a substantially straight strip shape.

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

In some embodiments, the length of the first parasitic radiating portion is substantially equal to 0.5 times the wavelength of the second frequency band.

In some embodiments, the length of the second parasitic radiating section is substantially equal to 0.5 times the wavelength of the second frequency band.

In some embodiments, the mobile device further comprises: a first additional radiating part coupled to the first parasitic radiating part, wherein the first additional radiating part is substantially in the shape of a straight strip.

In some embodiments, the mobile device further comprises: and a second additional radiating part coupled to the second parasitic radiating part, wherein the second additional radiating part is substantially in the shape of a straight strip.

In some embodiments, the mobile device further comprises: a tuning radiating portion extending across the slot, wherein the tuning radiating portion includes a first portion and a second portion, and the first portion and the second portion are respectively coupled to the metal machine component; and a circuit element coupled between the first portion and the second portion of the adjusting radiating portion.

In some embodiments, a vertical projection of the circuit element is located entirely inside the slot.

In some embodiments, the circuit element is a resistor, an inductor, a capacitor, a switching element, or a combination thereof.

In some embodiments, the antenna structure further covers a second frequency band between 699MHz to 960MHz, a third frequency band between 1710MHz to 2690MHz, and a fourth frequency band between 5150MHz to 5925 MHz.

In some embodiments, the length of the second parasitic radiating section is substantially equal to 0.5 times the wavelength of the third frequency band.

In some embodiments, the mobile device further comprises: and the thickening layer is arranged between the medium substrate and the metal machine component.

In another preferred embodiment, the present invention provides an antenna structure, which includes: a metal machine component having a slot, wherein the slot has a first closed end and a second closed end; a ground plane; a first parasitic radiation part coupled to the metal machine component and extending across the slot; a second parasitic radiation part coupled to the metal machine component and extending across the slot; a feed-in radiation part having a feed-in point, wherein the feed-in radiation part is disposed between the first parasitic radiation part and the second parasitic radiation part; the medium substrate is adjacent to the metal machine component, and the feed-in radiation part, the first parasitic radiation part and the second parasitic radiation part are all arranged on the medium substrate; the antenna structure covers at least one first frequency band, and the length of the slot is less than 0.48 times of the wavelength of the first frequency band.

The present invention provides a novel mobile device and antenna structure that can be integrated with a metal mechanism. Since the metal machine member can be considered as an extension of the antenna structure, it will not negatively affect the radiation performance of the antenna structure. In addition, because of the addition of the first parasitic radiation part and the second parasitic radiation part, the length of the slot of the antenna structure of the invention can not reach 0.5 times of the wavelength of the corresponding operation frequency, thereby further reducing the size of the whole antenna. Compared with the traditional design, the invention has the advantages of small size, wide frequency band, beautifying the appearance of the mobile device and the like, so the invention is very suitable for being applied to 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. 2 shows a return loss diagram of an antenna structure of a mobile device according to an embodiment of the invention.

Fig. 3 is a diagram illustrating the radiation efficiency of an antenna structure of a mobile device according to an embodiment of the invention.

FIG. 4A shows a top view of a mobile device according to another embodiment of the invention.

Fig. 4B shows a side view of a mobile device according to another embodiment of the invention.

Fig. 5 shows a return loss diagram of an antenna structure of a mobile device according to another embodiment of the invention.

Fig. 6 shows a radiation efficiency diagram of an antenna structure of a mobile device according to another embodiment of the invention.

Fig. 7 shows a side view of a mobile device according to another embodiment of the invention.

Description of the main element symbols:

100. 400, 700 mobile device

110. 410 metal machine component

120. 420 slotted hole

121. First closed end of 421 slotted holes

122. Second closed end of 422 slotted hole

123. 423 first side area

124. 424 second side area

130. 430 dielectric substrate

140. 440 ground plane

150. 450 first parasitic radiation part

151. 451 first end of the first parasitic radiation section

152. 452 second end of the first parasitic radiating section

160. 460 second parasitic radiation part

161. 461 first end of the second parasitic radiation part

162. 462 second end of the second parasitic radiation portion

170. 470 feed radiation part

171. 471 of the narrower part of the feed-in radiating part

172. 472 feed into the wider part of the radiating part

180 protruding branch

181 protruding the first end of the branch

182 protruding the second end of the branch

510 first additional radiating part

511 first end of the first additional radiating part

512 second end of the first additional radiating part

520 second additional radiating part

521 first end of the second additional radiating part

522 second end of the second additional radiating portion

580 regulating radiation part

581 adjusting the first part of the radiating part

582 adjusting a second portion of the radiating portion

585 separation space

590 circuit element

770 thickening layer

Distance between D1 and D2

First surface of E1 and E3 dielectric substrate

Second surface of E2, E4 medium substrate

FB1, FB3 first frequency band

FB2, FB4 second frequency band

FB5 third frequency band

FB6 fourth frequency band

FP1, FP2 feed point

GC1, GC5 first coupling gap

GC2, GC6 second coupling gap

Third coupling gap of GC3, GC7

Fourth coupling gap of GC4, GC8

Height H1, H2

L1, L2 Length

W1, W2 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" 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 is a top view of a Mobile Device (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. For example, the mobile device 100 may be a Smart Phone (Smart Phone), a Tablet Computer (Tablet Computer), or a Notebook Computer (Notebook Computer). Please refer to fig. 1A and fig. 1B together. As shown in fig. 1A and 1B, the mobile device 100 includes: a Metal mechanical Element (Metal mechanical Element)110, a Dielectric Substrate (Dielectric Substrate)130, a Ground Plane 140, a first Parasitic Radiation Element 150, a second Parasitic Radiation Element 160, and a Feeding Radiation Element 170, wherein the Ground Plane 140, the first Parasitic Radiation Element 150, the second Parasitic Radiation Element 160, and the Feeding Radiation Element 170 are all made of Metal materials, such as: copper, silver, aluminum, iron, or alloys thereof. It should be understood that, although not shown in fig. 1A and 1B, the mobile Device 100 may further include a Touch Control Panel (Touch Control Panel), a Display (Display Device), a Speaker (Speaker), a Battery Module (Battery Module), or (and) a Housing (Housing). In other embodiments, fig. 1A and 1B can also be regarded as an Antenna Structure (Antenna Structure) including all the elements of the mobile device 100.

The metal machine component 110 may be a metal housing of the mobile device 100. In some embodiments, the metal machine component 110 is a metal top cover of a notebook computer or a metal back cover of a tablet computer, but is not limited thereto. For example, if the mobile device 100 is a notebook computer, the metal machine component 110 can be commonly referred to as "part A" in the notebook computer field. The metal machine component 110 has a slot 120, wherein the slot 120 of the metal machine component 110 may be substantially in the shape of a straight strip. In detail, the slot 120 may have a first Closed End (Closed End)121 and a second Closed End 122 that are far away from each other. The mobile device 100 may also include a non-conductive material filled in the slot 120 of the metal machine component 110 to achieve waterproof or dustproof functions.

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 parasitic radiation portion 150, the second parasitic radiation portion 160, and the feeding radiation portion 170 are disposed on the first surface E1 of the dielectric substrate 130, and the second surface E2 of the dielectric substrate 130 is adjacent to the slot 120 of the metal machine component 110. 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 the case where two corresponding elements are in direct contact with each other (i.e., the distance is shortened to 0). In some embodiments, the second surface E2 of the dielectric substrate 130 is attached to the metal machine member 110, wherein the dielectric substrate 130 extends across the slot 120 of the metal machine member 110. The ground plane 140 may be implemented by a conductive material, such as: a copper foil, an aluminum foil, a conductive cloth, a conductive sponge, or a spring piece, which may be in a step shape. For example, the ground plane 140 may be coupled to the metal machine member 110 and then extend from the metal machine member 110 to the first surface E1 of the dielectric substrate 130. The ground plane 140 and the first parasitic radiation part 150 or the second parasitic radiation part 160 extend at least partially in opposite directions. For example, the ground plane 140 may extend toward the lower side of the slot 120, and the first parasitic radiation portion 150 and the second parasitic radiation portion 160 may extend toward the upper side of the slot 120. In some embodiments, the first parasitic radiation element 150, the second parasitic radiation element 160, the feeding radiation element 170, and the slot 120 of the metal machine element 110 together form an antenna structure. In some embodiments, the antenna structure of the mobile device 100 may have an asymmetric Pattern (asymmetric Pattern). In other embodiments, the antenna structure of the mobile device 100 may be modified to have a symmetric Pattern (symmetric Pattern).

The first parasitic radiation part 150 may at least partially have a U-shape, wherein an open side of the U-shape may face the feeding radiation part 170. The first parasitic radiation portion 150 has a first end 151 and a second end 152, wherein the first end 151 of the first parasitic radiation portion 150 is coupled to the metal machine element 110, and the second end 152 of the first parasitic radiation portion 150 extends across the entire width W1 of the slot 120 and extends toward the ground plane 140. That is, the first parasitic radiation part 150 has a first Vertical Projection (Vertical Projection) on the metal machine component 110, wherein the first Vertical Projection at least partially overlaps with the slot 120 of the metal machine component 110.

The second parasitic radiation portion 160 may also at least partially form a U-shape, wherein an open side of the U-shape may face the feeding radiation portion 170. In other words, the feeding radiating portion 170 is at least partially disposed between the opening side of the first parasitic radiating portion 150 and the opening side of the second parasitic radiating portion 160. The second parasitic radiation portion 160 has a first end 161 and a second end 162, wherein the first end 161 of the second parasitic radiation portion 160 is coupled to the metal machine element 110, and the second end 162 of the second parasitic radiation portion 160 extends across the entire width W1 of the slot 120 and extends toward the ground plane 140. That is, the second parasitic radiation portion 160 has a second vertical projection on the metal machine component 110, wherein the second vertical projection at least partially overlaps with the slot 120 of the metal machine component 110.

In detail, the slot 120 is disposed between a first side area 123 and a second side area 124. For example, the first side area 123 can be located on the upper side of the slot 120, and the second side area 124 can be located on the lower side of the slot 120, but is not limited thereto. The first end 151 of the first parasitic radiation portion 150 and the first end 161 of the second parasitic radiation portion 160 are coupled to the metal machine member 110 at the first side region 123. The second end 152 of the first parasitic radiation portion 150 and the second end 162 of the second parasitic radiation portion 160 cross the slot 120 and extend to the second side region 124. The second end 152 of the first parasitic radiation part 150 and the second end 162 of the second parasitic radiation part 160 extend toward the feeding radiation part 170.

It should be noted that the first parasitic radiation portion 150 and the second parasitic radiation portion 160 are directly coupled to a portion of the metal machine component 110 above the slot 120, rather than directly coupled to the ground plane 140 below the slot 120. Such a design may improve the bandwidth and matching characteristics of the antenna structure of the mobile device 100 based on actual measurements. In addition, the addition of the first parasitic radiation portion 150 and the second parasitic radiation portion 160 can also solve the problem that the length L1 of the slot 120 does not reach 0.5 times of the wavelength corresponding to the resonant frequency.

The feeding radiating portion 170 may have a substantially T-shape. The feeding radiating portion 170 is disposed between the first parasitic radiating portion 150 and the second parasitic radiating portion 160. In detail, the feeding radiating portion 170 has a non-uniform width structure including a narrower portion 171 and a wider portion 172. A Feeding Point (Feeding Point) FP1 is located at the narrower portion 171 of the Feeding radiating part 170, wherein the wider portion 172 of the Feeding radiating part 170 is coupled to the Feeding Point FP1 via the narrower portion 171 of the Feeding radiating part 170. The feed point FP1 may also be coupled to a Signal Source (not shown). For example, the signal source may be a Radio Frequency (RF) module, which may be used to excite the antenna structure of the mobile device 100. The feed point FP1 may also be located at the second side region 124 of the slot 120. In other embodiments, the feeding radiating portion 170 may be a straight strip, a trapezoid, or a triangle, but is not limited thereto.

A first Coupling Gap GC1 may be formed between the feeding radiating part 170 and the first end 151 of the first parasitic radiating part 150. A second coupling gap GC2 may be formed between the feeding radiating part 170 and the first end 161 of the second parasitic radiating part 160. A third coupling gap GC3 may be formed between the ground plane 140 and the second end 152 of the first parasitic radiating section 150. A fourth coupling gap GC4 may be formed between the ground plane 140 and the second end 162 of the second parasitic radiating element 160. Each Coupling gap is used to enhance the mutual Coupling Effect (Coupling Effect) between the corresponding devices.

In some embodiments, the first parasitic radiating portion 150 further includes a Protruding Branch (Protruding Branch)180, which may be made of a metal material. The protruding leg 180 may be substantially in the shape of a straight bar or a rectangle. The protruded branch 180 has a first End 181 and a second End 182, wherein the first End 181 of the protruded branch 180 is coupled to a turning point of the first parasitic radiation portion 150, and the second End 182 of the protruded branch 180 is an Open End (Open End) and extends away from the rest of the first parasitic radiation portion 150. The protruding branch 180 is used to fine-tune the matching characteristics of the antenna structure of the mobile device 100. It should be understood that the protruded branch 180 is only an Optional Element (Optional Element), and may be removed in other embodiments.

Fig. 2 shows a Return Loss (Return Loss) diagram of an antenna structure of the mobile device 100 according to an embodiment of the invention. According to the measurement results shown in fig. 2, the antenna structure of the mobile device 100 can cover a first frequency band FB1 and a second frequency band FB2, 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. Therefore, the antenna structure of the mobile device 100 can support at least 2.4GHz/5GHz WLAN (Wireless Local Area networks) dual-band operation. In terms of antenna principle, the first Frequency band FB1 and the second Frequency band FB2 can be generated by excitation of the feeding radiating part 170 and the slot 120 of the metal machine component 110, wherein the first parasitic radiating part 150 and the second parasitic radiating part 160 can be used to fine tune the Frequency offset (Frequency Shift amplitude) and Impedance Matching (Impedance Matching) of the first Frequency band FB1 and the second Frequency band FB2 at the same time. According to practical measurement results, the length L1 of the slot 120 of the metal machine member 110 (i.e., the length L1 from the first closed end 121 to the second closed end 122) may be less than 0.48 times the wavelength (0.48 λ) of the first frequency band FB 1. Therefore, the addition of the first parasitic radiation section 150 and the second parasitic radiation section 160 helps to further shrink the overall size of the antenna structure of the mobile device 100.

Fig. 3 shows a Radiation Efficiency (Radiation Efficiency) diagram of an antenna structure of the mobile device 100 according to an embodiment of the invention. According to the measurement results shown in fig. 3, the radiation efficiency of the antenna structure of the mobile device 100 in the first frequency band FB1 can reach about-4 dB, and the radiation efficiency in the second frequency band FB2 can reach about-2.5 dB, which can satisfy the practical application requirements of the general mobile communication device.

In some embodiments, the dimensions of the elements of the mobile device 100 may be as follows. The length L1 of the slot 120 may be approximately equal to 0.4 times the wavelength (0.4 λ) of the first frequency band FB 1. The width W1 of the slot 120 may be between 1mm to 5 mm. The distance D1 between the feed point FP1 and the second closed end 122 of the slot 120 may be between 0.15 and 0.5 times the length L1 of the slot 120. That is, the feed point FP1 is also close to the second closed end 122 of the slot 120 compared to the first closed end 121 of the slot 120. The length of the first parasitic radiation portion 150 (i.e., the length from the first end 151 to the second end 152) may be substantially equal to 0.5 times the wavelength (λ/2) of the second frequency band FB 2. The length of the second parasitic radiation portion 160 (i.e., the length from the first end 161 to the second end 162) may be substantially equal to 0.5 times the wavelength (λ/2) of the second frequency band FB 2. Each of the first, second, third, and fourth coupling gaps GC1, GC2, GC3, and GC4 may have a width of 0.2mm to 2mm, or 2mm to 20 mm. The above ranges of element sizes are derived from multiple experimental results, which help to optimize the operating Bandwidth (Operation Bandwidth) and Impedance Matching (Impedance Matching) of the antenna structure of the mobile device 100.

Fig. 4A shows a top view of a mobile device 400 according to another embodiment of the invention. Fig. 4B shows a side view of the mobile device 400 according to another embodiment of the invention. Please refer to fig. 4A and 4B together, which can be regarded as a modified Configuration (Configuration) of fig. 1A and 1B. As shown in fig. 4A and 4B, the mobile device 400 includes: a metal machine component 410, a dielectric substrate 430, a ground plane 440, a first parasitic Radiation part 450, a second parasitic Radiation part 460, a feeding Radiation part 470, a first Additional Radiation part (Additional Radiation Element)510, a second Additional Radiation part 520, a Tuning Radiation part (Tuning Radiation Element)580, and a Circuit Element (Circuit Element)590, wherein the ground plane 440, the first parasitic Radiation part 450, the second parasitic Radiation part 460, the feeding Radiation part 470, the first Additional Radiation part 510, the second Additional Radiation part 520, and the Tuning Radiation part 580 are all made of metal material. In other embodiments, fig. 4A and 4B may also be regarded as an antenna structure including all the elements of the mobile device 400.

The metal machine component 410 may be a metal housing of the mobile device 400. The metal machine component 410 has a slot 420, wherein the slot 420 of the metal machine component 410 may be substantially in the shape of a straight strip. In detail, the slot 420 may have a first closed end 421 and a second closed end 422 that are far away from each other. The mobile device 400 may also include a non-conductive material filled in the slot 420 of the metal machine component 410.

The dielectric substrate 430 has a first surface E3 and a second surface E4 opposite to each other, wherein the first parasitic radiation portion 450, the second parasitic radiation portion 460, the feeding radiation portion 470, the first additional radiation portion 510, the second additional radiation portion 520, the adjusting radiation portion 580, and the circuit element 590 are disposed on the first surface E3 of the dielectric substrate 430, and the second surface E4 of the dielectric substrate 430 is adjacent to the slot 420 of the metal-machine component 410. In some embodiments, the second surface E4 of the dielectric substrate 430 is attached to the metal machine member 410, wherein the dielectric substrate 430 extends across the slot 420 of the metal machine member 410. The ground plane 440 may be implemented by a conductive material, such as: a copper foil, an aluminum foil, a conductive cloth, a conductive sponge, or a spring piece, which may be in a step shape or an inclined plane shape. For example, the ground plane 440 may be coupled to the metal machine member 410 and extend from the metal machine member 410 to the first surface E3 of the dielectric substrate 430. In some embodiments, the first parasitic radiation part 450, the second parasitic radiation part 460, the feeding radiation part 470, the first additional radiation part 510, the second additional radiation part 520, the adjusting radiation part 580, the circuit element 590, and the slot 420 of the metal machine component 410 together form an antenna structure.

The first parasitic radiation part 450 may at least partially form a U-shape and at least partially surround the feeding radiation part 470, wherein an open side of the U-shape may face the feeding radiation part 470. The first parasitic radiation portion 450 has a first end 451 and a second end 452, wherein the first end 451 of the first parasitic radiation portion 450 is coupled to the metal machine element 410, and the second end 452 of the first parasitic radiation portion 450 extends across the entire width W2 of the slot 420 and extends toward the ground plane 440. That is, the first parasitic radiation part 450 has a first vertical projection on the metal machine component 410, wherein the first vertical projection at least partially overlaps with the slot 420 of the metal machine component 410.

The first additional radiating portion 510 may substantially have a straight bar shape. The first additional radiating portion 510 has a first end 511 and a second end 512, wherein the first end 511 of the first additional radiating portion 510 is coupled to a turning point of the first parasitic radiating portion 450, and the second end 512 of the first additional radiating portion 510 is an open end and extends in a direction away from the first parasitic radiating portion 450. The first additional radiating section 510 is used for fine tuning the operating frequency of the antenna structure of the mobile device 400.

The second parasitic radiation portion 460 may also at least partially form a U shape and at least partially surround the feeding radiation portion 470, wherein an open side of the U shape may face the feeding radiation portion 470. In other words, the feeding radiating portion 470 is at least partially disposed between the opening side of the first parasitic radiating portion 450 and the opening side of the second parasitic radiating portion 460. The second parasitic radiation portion 460 has a first end 461 and a second end 462, wherein the first end 461 of the second parasitic radiation portion 460 is coupled to the metal machine element 410, and the second end 462 of the second parasitic radiation portion 460 extends across the entire width W2 of the slot 420 and extends toward the ground plane 440. That is, the second parasitic radiation portion 460 has a second vertical projection on the metal machine component 410, wherein the second vertical projection at least partially overlaps with the slot 420 of the metal machine component 410.

The second additional radiating portion 520 may also be substantially in the shape of a straight strip. The second additional radiating portion 520 has a first end 521 and a second end 522, wherein the first end 521 of the second additional radiating portion 520 is coupled to a turning point of the second parasitic radiating portion 460, and the second end 522 of the second additional radiating portion 520 is an open end and extends in a direction away from the second parasitic radiating portion 460. In addition, the second end 522 of the second additional radiating portion 520 and the second end 512 of the first additional radiating portion 510 may both extend in directions substantially away from each other. The second additional radiating portion 520 may also be used to fine tune the operating frequency of the antenna structure of the mobile device 400.

In detail, the slot 420 is disposed between a first side region 423 and a second side region 424. For example, the first side region 423 can be located on the upper side of the slot 420, and the second side region 424 can be located on the lower side of the slot 420, but is not limited thereto. The first end 451 of the first parasitic radiating portion 450 and the first end 461 of the second parasitic radiating portion 460 are coupled to the metal machine member 410 at the first side region 423. The second end 452 of the first parasitic radiation portion 450 and the second end 462 of the second parasitic radiation portion 460 both cross the slot 420 and extend to the second side region 424. The second end 452 of the first parasitic radiation portion 450 and the second end 462 of the second parasitic radiation portion 460 also extend toward the direction close to the feeding radiation portion 470.

It should be noted that the first parasitic radiation part 450 and the second parasitic radiation part 460 are directly coupled to a portion of the metal machine component 410 above the slot 420, and not directly coupled to the ground plane 440 below the slot 420. Such a design may improve the bandwidth and matching characteristics of the antenna structure of the mobile device 400 based on actual measurements.

The feeding radiating portion 470 may substantially have a T-shape. The feeding radiating part 470 is disposed between the first parasitic radiating part 450 and the second parasitic radiating part 460. In detail, the feeding radiating portion 470 has a non-uniform width structure, which includes a narrower portion 471 and a wider portion 472. A feed point FP2 is located at the narrower portion 471 of the feed radiating part 470, wherein the wider portion 472 of the feed radiating part 470 is coupled to the feed point FP2 via the narrower portion 471 of the feed radiating part 470. The feed point FP2 can also be coupled to a signal source, which can be used to excite the antenna structure of the mobile device 400. The feed point FP2 may also be located at the second side region 424 of the slot 420. In other embodiments, the feeding radiating portion 470 may be a straight strip, a trapezoid, or a triangle, but is not limited thereto.

A first coupling gap GC5 may be formed between the feeding radiating part 470 and the first end 451 of the first parasitic radiating part 450. A second coupling gap GC6 may be formed between the feeding radiating part 470 and the first end 461 of the second parasitic radiating part 460. A third coupling gap GC7 may be formed between the ground plane 440 and the second end 452 of the first parasitic radiating section 450. A fourth coupling gap GC8 may be formed between the ground plane 440 and the second end 462 of the second parasitic radiating section 460.

The trim radiating portion 580 may generally take the form of a straight strip. The adjustment radiating portion 580 extends across the entire width W2 of the slot 420. In detail, the adjusting radiating portion 580 includes a first portion 581 and a second portion 582, wherein a separation Gap (Partition Gap)585 is formed between the first portion 581 and the second portion 582. First portion 581 and second portion 582 of conditioning radiator 580 are coupled to metal machine component 410, respectively. That is, the first portion 581 and the second portion 582 of the adjusting radiator 580 may extend from the first surface E3 of the dielectric substrate 430 to the metal machine member 410, respectively. A circuit element 590 is located at the separation gap 585, wherein the circuit element 590 is coupled in series between the first part 581 and the second part 582 of the trim radiating section 580. The circuit element 590 has a third vertical projection on the metal machine member 110, wherein the third vertical projection can be completely located inside the slot 420. In some embodiments, the circuit Element 590 is a Resistor (Resistor), an Inductor (Inductor), a Capacitor (Capacitor), a Switch Element (Switch Element), or a combination thereof. For example, the Resistor may be a Fixed Resistor (Fixed Resistor) or a Variable Resistor (Variable Resistor), the Inductor may be a Fixed Inductor (Fixed Inductor) or a Variable Inductor (Variable Inductor), and the Capacitor may be a Fixed Capacitor (Fixed Capacitor) or a Variable Capacitor (Variable Capacitor). In addition. The aforementioned switching element can be operated in a conducting State (Closed State) or an Open State (Open State). It should be noted that whether the adjusting radiating portion 580 and the circuit element 590 are located on the left side or the right side of the feeding radiating portion 470, they can be used to control the operating frequency band (or frequency offset) of the antenna structure, or can increase the operating bandwidth of the antenna structure of the mobile device 400.

Fig. 5 shows a return loss diagram of an antenna structure of a mobile device 400 according to another embodiment of the invention. According to the measurement results shown in fig. 5, the antenna structure of the mobile device 400 can cover a first frequency band FB3, a second frequency band FB4, a third frequency band FB5, and a fourth frequency band FB6, wherein the first frequency band FB3 can be between 699MHz to 960MHz, the second frequency band FB4 can be between 1710MHz to 2690MHz, the third frequency band FB5 can be between 3400MHz to 4300MHz, and the fourth frequency band FB6 can be between 5150MHz to 5925 MHz. Therefore, the antenna structure of the mobile device 400 can support at least multi-frequency operation of lte (long Term evolution). In terms of antenna principle, the first frequency band FB3, the second frequency band FB4, the third frequency band FB5, and the fourth frequency band FB6 can be generated by the feeding radiating part 470 and the slot 420 of the metal machine component 410, wherein the first parasitic radiating part 450 can be used to fine tune the frequency offset and impedance matching of the first frequency band FB3 and the third frequency band FB5, and the second parasitic radiating part 460 can be used to fine tune the frequency offset and impedance matching of the first frequency band FB3, the second frequency band FB4, the third frequency band FB5, and the fourth frequency band FB6 at the same time. The circuit element 590 is used for changing an equivalent Impedance Value (Effective Impedance Value) and a Short-circuit Boundary (Short-circuit Boundary) of the slot 420, and mainly adjusting the frequency range of the first frequency band FB 3. For example, if the Resistance (Resistance) or Capacitance (Capacitance) of the circuit element 590 is small to form a Short-Circuited Path, it is equivalent to moving the second closed end 422 of the slot 420 to the left, so that the operating frequency of the antenna structure is increased; conversely, if the circuit element 590 has a large resistance value or a small capacitance value, which forms an Open-circuit Path, it is equivalent to maintain the original position of the second closed end 422 of the slot 420, so that the operating frequency of the antenna structure is decreased. In other words, when the capacitance value of the circuit element 590 increases, the first frequency band FB3 moves in the low frequency direction, and when the Inductance value (Inductance) of the circuit element 590 increases, the first frequency band FB3 moves in the high frequency direction. In response to the impedance value of the circuit element 590, the frequency ranges of the second frequency band FB4, the third frequency band FB5, and the fourth frequency band FB6 may be adjusted accordingly. In some embodiments, the circuit element 590 may adjust its impedance value according to a control signal from a processor (not shown), which may further increase the operating bandwidth of the antenna structure of the mobile device 400. According to practical measurement results, the length L2 of the slot 420 of the metal machine component 410 (i.e., the length L2 from the first closed end 421 to the second closed end 422) can be less than 0.45 times the wavelength (0.45 λ) of the first frequency band FB 3. Therefore, the addition of the first parasitic radiation section 450, the second parasitic radiation section 460, the first additional radiation section 510, the second additional radiation section 520, the adjusting radiation section 580, and the circuit element 590 helps to further shrink the overall size of the antenna structure of the mobile device 400.

Fig. 6 shows a radiation efficiency diagram of an antenna structure of a mobile device 400 according to another embodiment of the invention. According to the measurement results shown in fig. 6, the antenna structure of the mobile device 400 has a radiation efficiency of about-4.5 dB in the first frequency band FB3, a radiation efficiency of about-2 dB in the second frequency band FB4, a radiation efficiency of about-3 dB in the third frequency band FB5, and a radiation efficiency of about-5.5 dB in the fourth frequency band FB6, which can satisfy the practical application requirements of the conventional mobile communication device.

In some embodiments, the dimensions of the elements of the mobile device 400 may be as follows. The length L2 of the slot 420 may be approximately equal to 0.4 times the wavelength (0.4 λ) of the first frequency band FB 3. The width W2 of the slot 420 may be between 1mm and 5mm, preferably 3 mm. The distance D2 between the feed point FP2 and the first closed end 421 of the slot 420 can be between 0.15 and 0.5 times the length L2 of the slot 420. That is, the feed point FP2 is also close to the first closed end 421 of the slot 420 compared to the second closed end 422 of the slot 420. The length of the first parasitic radiation portion 450 (i.e., the length from the first end 451 to the second end 452) may be substantially equal to 0.5 times the wavelength (λ/2) of the second frequency band FB 4. The length of the second parasitic radiation portion 460 (i.e., the length from the first end 461 to the second end 462) may be substantially equal to 0.5 times the wavelength (λ/2) of the third frequency band FB 5. That is, the length of the first parasitic radiation section 450 may be slightly greater than the length of the second parasitic radiation section 460. Each of the first, second, third, and fourth coupling gaps GC5, GC6, GC7, and GC8 may have a width of 0.2mm to 2mm, or 2mm to 20 mm. The above ranges of element sizes are derived from a number of experimental results that help optimize the operating bandwidth and impedance matching of the antenna structure of the mobile device 400.

Fig. 7 shows a side view of a mobile device 700 according to another embodiment of the invention. Fig. 7 is similar to fig. 4B. In the embodiment of fig. 7, the mobile device 700 further comprises a thickening layer 770, wherein the dielectric substrate 430 and the thickening layer 770 are made of a non-conductive material. The thickening layer 770 is disposed between the dielectric substrate 430 and the metal machine member 410. For example, the thickening layer 770 may directly contact the metal machine member 410 and serve to support the second surface E4 of the dielectric substrate 430. The Dielectric Constant (Dielectric Constant) of the thickening layer 770 may be the same as or different from the Dielectric Constant of the Dielectric substrate 430. The height H2 of the thickening layer 770 may be greater than or equal to the height H1 of the dielectric substrate 430. For example, the height H2 of the thickening layer 770 may be 1 to 10 times the height H1 of the dielectric substrate 430. Based on practical measurements, the addition of the thickening layer 770 can improve the partial operation bandwidth and radiation efficiency of the antenna structure of the mobile device 400, which can also be applied to the mobile device 100 (disposed between the dielectric substrate 130 and the metal machine component 110) in fig. 1B. The remaining features of the mobile device 700 of fig. 7 are similar to those of the

mobile devices

100 and 400 of fig. 1A, 1B, 4A and 4B, so that similar operation effects can be achieved in these embodiments.

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. 1A to 7. The present invention may include only any one or more features of any one or more of the embodiments of fig. 1A-7. 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 machine component having a slot, wherein the slot has a first closed end and a second closed end;

a ground plane;

a first parasitic radiation part coupled to the metal machine component and extending across the slot;

a second parasitic radiation part coupled to the metal machine component and extending across the slot;

a feed-in radiation part having a feed-in point, wherein the feed-in radiation part is disposed between the first parasitic radiation part and the second parasitic radiation part; and

a dielectric substrate adjacent to the metal machine component, wherein the feed-in radiation part, the first parasitic radiation part and the second parasitic radiation part are all arranged on the dielectric substrate;

wherein the feed-in radiation part, the first parasitic radiation part, the second parasitic radiation part and the slot of the metal machine component form an antenna structure together;

wherein the antenna structure covers at least a first frequency band, and the length of the slot is less than 0.48 times the wavelength of the first frequency band;

the grounding surface is made of a conductive material and extends from the metal machine component to the dielectric substrate, and at least part of the grounding surface and the first parasitic radiation part or the second parasitic radiation part extend towards opposite directions;

wherein each of the first parasitic radiation part and the second parasitic radiation part at least partially presents a U shape, and the feed-in radiation part is at least partially arranged between an opening side of the first parasitic radiation part and an opening side of the second parasitic radiation part.

2. The mobile device of claim 1 wherein the antenna structure has an asymmetric pattern.

3. The mobile device according to claim 1, wherein the feeding radiating portion has a non-uniform width structure.

4. The mobile device of claim 1, wherein the slot is between a first side region and a second side region, a first end of the first parasitic radiating portion and a first end of the second parasitic radiating portion are coupled to the metal machine component at the first side region, the feed point is located at the second side region, and a second end of the first parasitic radiating portion and a second end of the second parasitic radiating portion both span the slot and extend to the second side region.

5. The mobile device as claimed in claim 1, wherein the first parasitic radiating portion further comprises a protruding portion, and the protruding portion is substantially in the shape of a straight bar.

6. The mobile device of claim 1, wherein the antenna structure further covers a second frequency band, the first frequency band is between 2400MHz and 2500MHz, and the second frequency band is between 5150MHz and 5850 MHz.

7. The mobile device as claimed in claim 6, wherein the length of the first parasitic radiation portion is substantially equal to 0.5 times the wavelength of the second frequency band.

8. The mobile device as claimed in claim 6, wherein the length of the second parasitic radiating portion is substantially equal to 0.5 times the wavelength of the second frequency band.

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

a first additional radiating part coupled to the first parasitic radiating part, wherein the first additional radiating part is substantially in the shape of a straight strip.

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

a second additional radiating part coupled to the second parasitic radiating part, wherein the second additional radiating part is substantially in the shape of a straight strip.

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

a tuning radiating portion extending across the slot, wherein the tuning radiating portion includes a first portion and a second portion, and the first portion and the second portion are respectively coupled to the metal machine component; and

a circuit element coupled between the first portion and the second portion of the trim radiating portion.

12. The mobile device as claimed in claim 11, wherein a vertical projection of the circuit element is located entirely inside the slot.

13. The mobile device of claim 11, wherein the circuit element is a resistor, an inductor, a capacitor, a switching element, or a combination thereof.

14. The mobile device of claim 1, wherein the antenna structure further covers a second frequency band between 699MHz to 960MHz, a third frequency band between 1710MHz to 2690MHz, a third frequency band between 3400MHz to 4300MHz, and a fourth frequency band between 5150MHz to 5925 MHz.

15. The mobile device of claim 14, wherein the length of the first parasitic radiating portion is substantially equal to 0.5 times the wavelength of the second frequency band.

16. The mobile device of claim 14, wherein the length of the second parasitic radiating portion is substantially equal to 0.5 times the wavelength of the third frequency band.

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

and the thickening layer is arranged between the medium substrate and the metal machine component.

18. An antenna structure, comprising:

a ground plane;