TW201813195A - Mobile device - Google Patents

Abstract

A mobile device includes a ground element and an antenna structure. The antenna structure includes a feeding radiation element, a shorting element, a first parasitic element, and a second parasitic element. The feeding radiation element has a feeding point and a grounding point. The grounding point is coupled through the shorting element to the ground element. The first parasitic element is close to the feeding radiation element. The first parasitic element is floating and separate from the feeding radiation element and the ground element. The second parasitic element is coupled to the ground element, and is close to the first parasitic element. The first parasitic element extends and at least partially surrounds the feeding radiation element and the second parasitic element.

Description

 Mobile device  

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

With the development of mobile communication technologies, mobile devices have become more and more popular in recent years, such as portable computers, mobile phones, multimedia players, and other portable electronic devices with mixed functions. In order to meet people's needs, mobile devices usually have the function of wireless communication. Some cover long-range wireless communication range, for example, mobile phones use 2G, 3G, LTE (Long Term Evolution) systems and the 700MHz, 850MHz, 900MHz, 1800MHz, 1900MHz, 2100MHz, 2300MHz and 2500MHz bands used for communication, and Some cover short-range wireless communication ranges, such as Wi-Fi, Bluetooth systems using 2.4GHz, 5.2GHz and 5.8GHz bands for communication.

The antenna is an indispensable component in mobile devices that support wireless communication. However, the antenna is susceptible to proximity to metal components. Taking a deformable mobile device as an example, when it operates in different modes, because the relative positions of the antenna element and the metal component therein change, the antenna element is often disturbed and the overall communication quality is degraded. In view of this, it is necessary to propose a new solution to overcome the problems faced by traditional technologies.

In a preferred embodiment, the present invention provides a mobile device comprising: a grounding element; and an antenna structure comprising: a feeding radiation portion having a feeding point and a grounding point; and a shorting portion, wherein the connecting a location is coupled to the grounding element via the shorting portion; a first parasitic portion adjacent to the feeding radiation portion, wherein the first parasitic portion is in a floating state and is separated from the feeding radiation portion and the grounding member And a second parasitic portion coupled to the grounding element adjacent to the first parasitic portion, wherein the first parasitic portion extends at least partially around the feeding radiation portion and the second parasitic portion .

In some embodiments, the combination of the feed radiation portion and the short circuit portion is substantially a T-shape.

In some embodiments, the first parasitic portion is substantially L-shaped and includes an end rectangular widened portion.

In some embodiments, the second parasitic portion is substantially an L-shape.

In some embodiments, a first coupling gap is formed between the feeding radiation portion and the first parasitic portion, the first coupling gap is between 1 mm and 2 mm, and the first parasitic portion and the second parasitic portion A second coupling gap is formed between the portions, and the second coupling gap is between 1 mm and 2 mm.

In some embodiments, the antenna structure operates in a low frequency band and a high frequency band between 2400 MHz and 2500 MHz, and the high frequency band is between 5150 MHz and 5850 MHz.

In some embodiments, the feed radiation portion and the first parasitic portion are excited to generate the low frequency band, and wherein the feed radiation portion, the short circuit portion, and the second parasitic portion are excited to generate the high frequency band.

In some embodiments, the length of the first parasitic portion is about 0.5 times the wavelength of the low frequency band, the length of the feeding radiation portion is about 0.25 times the wavelength of the high frequency band, and the length of the second parasitic portion is about It is 0.25 times the wavelength of the high frequency band.

In some embodiments, the mobile device is a deformable mobile device and operates in a notebook mode or a tablet mode.

In some embodiments, the mobile device further includes: an upper cover including an upper casing and a display protection casing, wherein the antenna structure is disposed at an edge of the upper casing; the lower cover includes an input protection casing and a lower housing; and a rotating shaft member coupled between the upper cover and the lower cover; wherein when the mobile device is switched from the notebook mode to the tablet mode, the upper housing and the lower housing are parallel and close to each other, and The radiation characteristics of the antenna structure do not change much.

100, 300‧‧‧ mobile devices

110‧‧‧ Grounding components

120‧‧‧Antenna structure

130‧‧‧Feed into the Radiation Department

131‧‧‧Feed into the first end of the Radiation Department

132‧‧‧Feed into the second end of the Radiation Department

140‧‧‧ Short circuit

141‧‧‧The first end of the short circuit

142‧‧‧The second end of the short circuit

150‧‧‧The first parasitic part

151‧‧‧The first end of the first parasitic part

152‧‧‧The second end of the first parasitic part

155‧‧‧The end of the first parasitic part of the rectangular widened part

160‧‧‧Second parasitic

161‧‧‧ the first end of the second parasitic part

162‧‧‧ second end of the second parasitic part

190‧‧‧Signal source

370‧‧‧Upper cover

371‧‧‧Upper casing

372‧‧‧Display protection enclosure

375‧‧‧First metal-free area

380‧‧‧Under the cover

381‧‧‧Input protector

382‧‧‧ Lower casing

385‧‧‧Second metal-free area

390‧‧‧ shaft components

CC1‧‧‧ first curve

CC2‧‧‧second curve

CC3‧‧‧ third curve

CC4‧‧‧Fourth curve

D1, D2‧‧‧ spacing

FB1‧‧‧Low frequency band

FB2‧‧‧High frequency band

FP‧‧‧Feeding point

G1‧‧‧ gap

GC1‧‧‧First coupling gap

GC2‧‧‧Second coupling gap

GP‧‧‧ Grounding point

L1‧‧‧ length

W1, W2‧‧‧ width

1 is a schematic diagram showing a mobile device according to an embodiment of the present invention; FIG. 2 is a diagram showing a return loss of an antenna structure of a mobile device according to an embodiment of the present invention; A schematic diagram of a mobile device according to an embodiment of the invention; FIG. 3B is a schematic diagram showing the operation of the mobile device in a notebook mode according to an embodiment of the invention; FIG. 3C is a view showing an action according to an embodiment of the invention. FIG. 4 is a schematic diagram showing a return loss of an antenna structure of a mobile device according to an embodiment of the present invention; and FIG. 5 is a view showing a mobile device according to an embodiment of the present invention; Antenna efficiency diagram of the antenna structure.

In order to make the objects, features and advantages of the present invention more comprehensible, the specific embodiments of the invention are set forth in the accompanying drawings.

Certain terms are used throughout the description and claims to refer to particular elements. Those skilled in the art will appreciate that a hardware manufacturer may refer to the same component by a different noun. The scope of the present specification and the patent application do not use the difference in the name as the means for distinguishing the elements, but the difference in function of the elements as the criterion for distinguishing. The words "including" and "including" as used throughout the specification and patent application are open-ended terms and should be interpreted as "including but not limited to". The term "substantially" means that within the acceptable error range, those skilled in the art will be able to solve the technical problems within a certain error range to achieve the basic technical effects. In addition, the term "coupled" is used in this specification to include any direct and indirect electrical connection means. Therefore, if a first device is coupled to a second device, the first device can be directly electrically connected to the second device, or indirectly connected to the second device via other devices or connection means. Two devices.

1 is a schematic diagram showing a mobile device 100 according to an embodiment of the invention. The mobile device 100 can be a smart phone, a tablet computer, or a notebook computer. As shown in FIG. 1, the mobile device 100 includes at least one grounding element 110 and an antenna structure 120. The grounding element 110 and the antenna structure 120 can be made of a conductor material, such as copper, silver, aluminum, iron, or an alloy thereof. The grounding element 110 and the antenna structure 120 can be disposed on a dielectric substrate, for example: A FR4 (Flame Retardant 4) substrate. It should be understood that, although not shown in FIG. 1 , the mobile device 100 may further include other components, such as a touch module, a power supply module, a display, a keyboard, or (and) a housing.

The antenna structure 120 includes a feed radiation portion 130, a short circuit portion 140, a first parasitic portion 150, and a second parasitic portion 160. The feed radiation portion 130 may be substantially straight. The feeding radiation portion 130 has a first end 131 and a second end 132, wherein the first end 131 and the second end 132 of the feeding radiation portion 130 are each an open end. The feeding radiation portion 130 further has a feeding point FP and a grounding point GP, wherein the feeding point FP is adjacent to the second end 132 of the feeding radiation portion 130, and the grounding point GP is adjacent to the feeding radiation portion 130. First end 131. The feed point FP is coupled to a signal source 190. Signal source 190 can be a radio frequency (Radio Frequency) module that can be used to excite antenna structure 120. The shorting portion 140 may be substantially straight. The shorting portion 140 has a first end 141 and a second end 142. The first end 141 of the shorting portion 140 is coupled to the grounding point GP, and the second end 142 of the shorting portion 140 is coupled to the grounding member 110. The ground point GP fed to the radiation portion 130 is coupled to the ground element 110 via the short-circuit portion 140. The combination of one of the feed radiation portion 130 and the short circuit portion 140 is substantially a T-shape.

The first parasitic portion 150 may be substantially in an L shape and may include an end rectangular widened portion 155. The first parasitic portion 150 has a first end 151 and a second end 152, wherein the first end 151 and the second end 152 of the first parasitic portion 150 are each an open end, and the end rectangular widened portion 155 is located The second end 152 of the first parasitic portion 150. The first parasitic portion 150 is adjacent to the feeding radiation portion 130, wherein a first coupling gap GCl is formed between the feeding radiation portion 130 and the first parasitic portion 150. The first parasitic portion 150 is floating and separated from the feed radiation portion 130, the short circuit portion 140, the second parasitic portion 160, and the ground element 110. The first parasitic portion 150 extends at least partially around the feeding radiation portion 130 and the second parasitic portion 160 such that the feeding radiation portion 130, the short circuit portion 140, and the second parasitic portion 160 are all interposed between the first parasitic portion Between 150 and ground element 110.

The second parasitic portion 160 may be substantially in an L shape. The second parasitic portion 160 has a first end 161 and a second end 162. The first end 161 of the second parasitic portion 160 is an open end, and the second end 162 of the second parasitic portion 160 is coupled to the ground. Element 110. The second parasitic portion 160 is adjacent to the first parasitic portion 150, wherein a second coupling gap GC2 is formed between the first parasitic portion 150 and the second parasitic portion 160.

2 is a diagram showing a Return Loss diagram of the antenna structure 120 of the mobile device 100 according to an embodiment of the present invention, wherein the horizontal axis represents the operating frequency (MHz) and the vertical axis represents the return loss (dB). As shown in FIG. 2, the antenna structure 120 can cover at least a low frequency band FB1 and a high frequency band FB2, wherein the low frequency band FB1 is between 2400 MHz and 2500 MHz, and the high frequency band FB2 is between 5150 MHz and 5850 MHz. . Therefore, the antenna structure 120 can support at least WLAN (Wireless Local Area Networks) 2.4 GHz/5 GHz dual-frequency operation. According to the actual measurement results, the antenna efficiency of the antenna structure 120 in the low frequency band FB1 is about -2 dB, and the antenna efficiency in the high frequency band FB2 is about -3 dB, which is in line with the general mobile communication. Application requirements of the device.

In terms of the antenna principle, the feed radiation portion 130 is directly fed by the signal source 190, and the short circuit portion 140 is used to adjust the impedance matching of the feed radiation portion 130 and increase the inductance of the antenna structure 120 (Inductance). The first parasitic portion 150 is coupled to be excited by the feed radiation portion 130, and the second parasitic portion 160 is coupled by the first parasitic portion 150 to be excited. In detail, the feeding radiation portion 130 and the first parasitic portion 150 excite the low frequency band FB1, and the feeding radiation portion 130, the short circuit portion 140, and the second parasitic portion 160 are excited to generate the high frequency band FB2. The end rectangular widened portion 155 of the first parasitic portion 150 helps to increase the bandwidth of the aforementioned low frequency band FB1.

In some embodiments, the component dimensions of the mobile device 100 can be as described below. The length of the first parasitic portion 150 may be about 0.5 times the wavelength (λ/2) of the low frequency band FB1. The length of the feeding radiation portion 130 may be about 0.25 times the wavelength (λ/4) of the high frequency band FB2. The length of the second parasitic portion 160 may be about 0.25 times the wavelength (λ/4) of the high frequency band FB2. The first coupling gap GC1 may be between 1 mm and 2 mm. The second coupling gap GC2 may be between 1 mm and 2 mm. The distance D1 between the second end 132 of the feeding radiation portion 130 and the grounding member 110 may be between 1 mm and 3 mm. The distance D2 between the first end 161 of the second parasitic portion 160 and the ground element 110 may be between 1 mm and 3 mm. The width W1 of the first parasitic portion 150 (except for the end rectangular widened portion 155) may be between 0.5 mm and 1.5 mm. The length L1 of the end rectangular widened portion 155 of the first parasitic portion 150 may be between 2 mm and 4 mm. The width W2 of the end rectangular widened portion 155 of the first parasitic portion 150 may be between 2 mm and 3 mm. The above component size range is based on a number of experimental results that optimize the operating band and impedance matching of the antenna structure 120.

Figure 3A is a schematic diagram showing a mobile device 300 in accordance with an embodiment of the present invention. In the embodiment of FIG. 3A, the mobile device 300 is a Convertible Mobile Device and can operate in a notebook mode or a tablet mode. In addition to the grounding element 110 and the antenna structure 120, the mobile device 300 further includes an upper cover 370, a lower cover 380, and a hinge element 390, wherein the rotating shaft member 390 is coupled to the upper cover. Between the 370 and the lower cover 380, the mobile device 300 can be switched between different modes of use. In detail, the upper cover 370 includes an upper casing 371 (commonly referred to as A piece) and a display protection casing 372 (commonly referred to as B piece), wherein one edge of the upper cover 370 is a first metal-free region 375, and the antenna structure 120 is disposed. At one edge of the upper outer casing 371 and within the first metal free region 375. On the other hand, the lower cover 380 includes an input protector housing 381 (commonly referred to as C member) and a lower outer casing 382 (commonly referred to as D member), wherein a second metal-free region 385 is formed at one edge of the lower cover 380. The upper outer casing 371 and the lower outer casing 382 may collectively serve as one of the metal back covers of the mobile device 300, wherein the first metal free region 375 and the second metal free region 385 may form an antenna window of the mobile device 300 such that the antenna structure 120 electromagnetic waves can be transmitted through this antenna window. In other embodiments, two or more antenna structures 120 may be disposed in the first metal-free region 375 to form a multi-input multi-output (MIMO) antenna system. Antenna Diversity Gain.

Figure 3B is a diagram showing the operation of the mobile device 300 in a notebook mode in accordance with an embodiment of the present invention. When the mobile device 300 is operated in the notebook mode, the antenna structure 120 is separated from the lower casing 382, so that good radiation efficiency is generally maintained. FIG. 3C is a schematic diagram showing the operation of the mobile device 300 in a tablet mode according to an embodiment of the invention. When the mobile device 300 is switched from the notebook mode to the tablet mode, the upper casing 371 and the lower casing 382 are parallel and close to each other (for example, the gap G1 between the upper casing 371 and the lower casing 382 may be less than 5 mm), which will improve the antenna structure 120. Capacitance causes the operating frequency to shift. To overcome this problem, the present invention uses a coupled feed antenna structure 120 that adds a ground point GP and a shorting portion 140 near the feed point FP to enhance the inductance of the antenna structure 120. This inductance is available. The capacitance generated when the antenna structure 120 and the lower casing 382 are close to each other is cancelled. In addition, the aforementioned coupling feed architecture also helps to reduce the Mirror Current generated on the lower casing 382 and can reduce the Specific Absorption Rate (SAR) of the antenna structure 120. Therefore, even if the mobile device 300 is switched from the notebook mode to the tablet mode, the radiation characteristics of the antenna structure 120 are hardly greatly adversely affected.

Figure 4 is a graph showing the Return Loss of the antenna structure 120 of the mobile device 300 in accordance with an embodiment of the present invention, wherein the horizontal axis represents the operating frequency (MHz) and the vertical axis represents the return loss (dB). As shown in FIG. 4, a first curve CC1 represents the return loss characteristic of the antenna structure 120 when the mobile device 300 operates in the notebook mode, and a second curve CC2 represents the return loss of the antenna structure 120 when the mobile device 300 operates in the tablet mode. characteristic. Comparing the first curve CC1 and the second curve CC2, when the mobile device 300 is switched from the notebook mode to the tablet mode, the operating band of the antenna structure 120 does not change much, so it can still support in different usage modes. The dual frequency operation of the deformed mobile device 300.

5 is a diagram showing an antenna efficiency of an antenna structure 120 of a mobile device 300 according to an embodiment of the present invention, wherein the horizontal axis represents the operating frequency (MHz) and the vertical axis represents the antenna efficiency (dB). As shown in FIG. 5, a third curve CC3 represents the antenna efficiency of the antenna structure 120 when the mobile device 300 operates in the notebook mode, and a fourth curve CC4 represents the antenna efficiency of the antenna structure 120 when the mobile device 300 operates in the tablet mode. Comparing the third curve CC3 and the fourth curve CC4, when the mobile device 300 is switched from the notebook mode to the tablet mode, the antenna efficiency of the antenna structure 120 decreases only slightly (about 1 dB), so it can still be used in different usage modes. The dual frequency operation of the deformable mobile device 300 can be supported.

The present invention provides a novel antenna structure that can be used alone to cover dual wideband operation or to have a deformable mobile device. When the antenna structure is applied to a deformable mobile device, it helps to reduce the negative effects of switching between different usage modes and maintains good communication quality of the mobile device.

It is to be noted that the above-described component sizes, component shapes, and frequency ranges are not limitations of the present invention. The antenna designer can adjust these settings according to different needs. The mobile device and antenna structure of the present invention are not limited to the state illustrated in Figures 1-5. The present invention may include only any one or more of the features of any one or a plurality of embodiments of Figures 1-5. In other words, not all illustrated features must be implemented simultaneously in the mobile device and antenna structure of the present invention.

The ordinal numbers in this specification and the scope of the patent application, such as "first", "second", "third", etc., have no sequential relationship with each other, and are only used to indicate that two are identical. Different components of the name.

The present invention has been described above with reference to the preferred embodiments thereof, and is not intended to limit the scope of the present invention, and the invention may be modified and modified without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims.

Claims (10)

 A mobile device includes: a grounding element; and an antenna structure, including: a feeding radiation portion having a feeding point and a grounding point; and a shorting portion, wherein the grounding point is coupled to the grounding portion via the shorting portion a grounding element; a first parasitic portion adjacent to the feeding radiation portion, wherein the first parasitic portion is in a floating state and separated from the feeding radiation portion and the grounding member; and a second parasitic portion coupled And to the grounding element adjacent to the first parasitic portion, wherein the first parasitic portion extends at least partially around the feeding radiation portion and the second parasitic portion.    The mobile device of claim 1, wherein the combination of the feed radiation portion and the short circuit portion is substantially a T-shape.    The mobile device of claim 1, wherein the first parasitic portion is substantially in the shape of an L and includes a rectangular portion at the end.    The mobile device of claim 1, wherein the second parasitic portion is substantially in an L shape.    The mobile device of claim 1, wherein a first coupling gap is formed between the feeding radiation portion and the first parasitic portion, and the first coupling gap is between 1 mm and 2 mm. A second coupling gap is formed between a parasitic portion and the second parasitic portion, and the second coupling gap is between 1 mm and 2 mm.    The mobile device of claim 1, wherein the antenna structure operates in a low frequency band and a high frequency band, the low frequency band is between 2400 MHz and 2500 MHz, and the high frequency band is between 5150 MHz. Between 5850MHz.    The mobile device according to claim 6, wherein the feeding radiation portion and the first parasitic portion are excited to generate the low frequency band, wherein the feeding radiation portion, the short circuit portion, and the second parasitic portion The excitation is generated to generate the high frequency band.    The mobile device of claim 6, wherein the length of the first parasitic portion is about 0.5 times the wavelength of the low frequency band, and the length of the feeding radiation portion is about 0.25 times the wavelength of the high frequency band. The length of the second parasitic portion is about 0.25 times the wavelength of the high frequency band.    The mobile device of claim 1, wherein the mobile device is a deformable mobile device and operates in a notebook mode or a tablet mode.    The mobile device of claim 9, further comprising: an upper cover, comprising an upper casing and a display protection casing, wherein the antenna structure is disposed at an edge of the upper casing; the lower cover includes an input And a lower housing; and a rotating shaft member coupled between the upper cover and the lower cover; wherein when the mobile device is switched from the notebook mode to the tablet mode, the upper housing and the lower housing are parallel to each other And close, and the radiation characteristics of the antenna structure do not change much.