TWI626792B - Mobile device - Google Patents

Abstract

A mobile device includes: a grounding element and an antenna structure. The antenna structure includes a half loop radiating portion, a first short circuit portion, a second short circuit portion, a coupling extension portion, and a parasitic radiation portion. The half-loop radiation portion has a feed point, a first ground point, and a second ground point, wherein the first ground point is coupled to the ground element via the first short circuit portion, and the second connection The location is coupled to the ground element via the second shorting portion. The coupling extension is coupled to the second shorting portion. The parasitic radiating portion is coupled to the grounding element and adjacent to the coupling extension.

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.

In order to pursue a beautiful appearance, today's designers often add elements of metal components to mobile devices. However, the added metal components are likely to have a negative impact on the antennas that support wireless communication in mobile devices, thereby reducing the overall communication quality of the mobile device. Therefore, it is necessary to propose a new mobile device and antenna structure to overcome the problems faced by traditional technologies.

In a preferred embodiment, the present invention provides a mobile device package The method includes: a grounding component; and an antenna structure, including: a half loop radiating portion having a feeding point, a first grounding point, and a second grounding point; and a first shorting portion, wherein the first grounding point The first shorting portion is coupled to the grounding element; a second shorting portion, wherein the second grounding point is coupled to the grounding element via the second shorting portion; a coupling extension portion coupled to the first a short circuit portion; and a parasitic radiation portion coupled to the ground element and adjacent to the coupling extension.

In some embodiments, the half loop radiating portion, the first shorting portion, and the grounding member collectively surround a slot region, wherein the second shorting portion, the coupling extending portion, and the parasitic radiating portion are both Located in the slot area.

In some embodiments, the half loop radiating portion is substantially a J-shape.

In some embodiments, the first shorting portion is substantially straight and is substantially perpendicular to the semi-circular radiating portion and the grounding member.

In some embodiments, the combination of the second shorting portion and the coupling extension is substantially a T-shape, and the second shorting portion and the half-loop radiating portion and the grounding member are substantially perpendicular to each other.

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

In some embodiments, a coupling gap is formed between the coupling extension and the parasitic radiation portion, and the coupling gap is less than 1 mm, or between 1 mm and 3 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 half loop radiating portion, the first shorting portion, and the grounding element are excited to generate the low frequency band, and wherein the half loop radiating portion, the second short portion, the coupling extension, And the parasitic radiation portion excites the high frequency band.

In some embodiments, the total length of the half loop radiating portion and the first short portion is about 0.5 times the wavelength of the low frequency band, and the length of the parasitic radiating portion is about 0.25 times the wavelength of the high frequency band.

In some embodiments, the mobile device further includes: a metal back cover coupled to the ground element, wherein the antenna structure is disposed adjacent to the metal back cover, but the metal back cover is not adapted to the antenna structure Radiation characteristics cause too much negative impact.

100, 500‧‧‧ mobile devices

110‧‧‧ Grounding components

120‧‧‧Antenna structure

130‧‧‧Half loop radiation department

The first end of the 131‧‧‧ half-loop radiation section

132‧‧‧Second end of the semi-circular radiation section

140‧‧‧First short circuit

141‧‧‧The first end of the first short circuit

142‧‧‧The second end of the first short circuit

150‧‧‧Second short circuit

151‧‧‧ the first end of the second short circuit

152‧‧‧ second end of the second short circuit

160‧‧‧Coupling extension

161‧‧‧The first end of the coupling extension

162‧‧‧The second end of the coupling extension

170‧‧‧ Parasitic Radiation Department

171‧‧‧The first end of the parasitic radiation department

172‧‧‧The second end of the parasitic radiation department

180‧‧‧Slot area

190‧‧‧Signal source

510‧‧‧Metal back cover

CV‧‧‧ equivalent capacitor

FB1‧‧‧Low frequency band

FB2‧‧‧High frequency band

FP‧‧‧Feeding point

GC1‧‧‧ coupling gap

GP1‧‧‧first grounding point

GP2‧‧‧second grounding point

PA1‧‧‧Low frequency resonance path

PA2‧‧‧ high frequency resonance path

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; An antenna efficiency diagram of an antenna structure of a mobile device according to an embodiment of the invention; FIG. 4 is a schematic diagram showing an antenna of a mobile device according to an embodiment of the invention; and FIG. 5A is a diagram showing another embodiment of the present invention. a top view of the mobile device; and FIG. 5B shows a side of the mobile device according to another embodiment of the present invention view.

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 may 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 may be disposed on a dielectric substrate, such as 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 half loop radiation portion 130, a first short circuit portion 140, a second short circuit portion 150, a coupling extension portion 160, and a parasitic radiation portion 170. In detail, the half-loop radiation portion 130, the first short-circuit portion 140, and the grounding member 110 collectively surround one of the rectangular slot regions 180, wherein the second short-circuit portion 150, the coupling extension portion 160, and the parasitic radiation portion 170 are both Located within the slot area 180. The half loop radiation portion 130 may be substantially a J shape. The half loop radiating portion 130 has a first end 131 and a second end 132, wherein the first end 131 of the half loop radiating portion 130 is a feeding point FP, and the second end 132 of the half loop radiating portion 130 It is a first grounding point GP1. The half loop radiation portion 130 further has a second ground point GP2 between the feed point FP and the first ground point GP1. 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 first shorting portion 140 may have a substantially straight strip shape that is substantially perpendicular to the semi-circular radiating portion 130 and the grounding member 110. The first shorting portion 140 has a first end 141 and a second end 142. The first end 141 of the first shorting portion 140 is coupled to the first grounding point GP1, and the second end 142 of the first shorting portion 140 is 142. The first grounding point GP1 of the half-loop radiating portion 130 is coupled to the grounding element 110 via the first shorting portion 140. The second shorting portion 150 may have a substantially straight strip shape that is substantially perpendicular to the half loop radiating portion 130 and the grounding member 110. Second short circuit portion 150 The first end 151 of the second shorting portion 150 is coupled to the second grounding point GP2, and the second end 152 of the second shorting portion 150 is coupled to the ground. The element 110 is such that the second grounding point GP2 of the half loop radiating portion 130 is coupled to the grounding element 110 via the second shorting portion 150. The coupling extension 160 can be generally a straight strip that is substantially perpendicular to the second shorting portion 150. The coupling end 160 has a first end 161 and a second end 162. The first end 161 of the coupling extension 160 is an open end, and the second end 162 of the coupling extension 160 is coupled to the One central portion of the second short-circuit portion 150 is such that one of the second short-circuit portion 150 and the coupling extension portion 160 is combined in a substantially T-shape. The parasitic radiation portion 170 may be substantially in an L shape. The parasitic radiating portion 170 has a first end 171 and a second end 172, wherein the first end 171 of the parasitic radiating portion 170 is an open end and adjacent to the first end 161 of the coupling extension 160, and the parasitic radiating portion 170 The second end 172 is coupled to the ground element 110. A coupling gap GC1 may be formed between the first end 161 of the coupling extension 160 and the first end 171 of the parasitic radiation portion 170.

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.

3 is a diagram showing an antenna efficiency of an antenna structure 120 of a mobile device 100 according to an embodiment of the invention, wherein The horizontal axis represents the operating frequency (MHz) and the vertical axis represents the antenna efficiency (dB). As shown in FIG. 3, the antenna efficiency of the antenna structure 120 in the low frequency band FB1 is about -5 dB, and the antenna efficiency in the high frequency band FB2 is about -3 dB, which is in line with the general action. Application requirements for communication devices.

FIG. 4 is a schematic diagram showing the antenna of the mobile device 100 according to an embodiment of the invention. In terms of antenna principle, the half-turn radiating portion 130 is directly fed by the signal source 190, so the current density adjacent to the second short-circuit portion 150 and the coupling extension portion 160 at the feeding point FP is high, so that parasitic radiation The portion 170 can be excited by the coupling extension 160. In detail, the half-loop radiating portion 130, the first short-circuit portion 140, and the grounding member 110 together form a low-frequency resonance path PA1 to excite the low-frequency band FB1; and the half-loop radiating portion 130 and the second short-circuit portion 150, the coupling extension portion 160, and the parasitic radiation portion 170 together form a high frequency resonance path PA2 to excite the aforementioned high frequency band FB2. In addition, the low frequency resonant path PA1 can be excited to generate a higher-order resonant mode (Higher-order Resonant Mode) to widen the aforementioned high frequency band FB2.

In some embodiments, the component dimensions of the mobile device 100 can be as described below. The total length of the half-return radiating portion 130 and the first short-circuit portion 140 may be about 0.5 times the wavelength (λ/2) of the aforementioned low-frequency band. The length of the parasitic radiation portion 170 may be about 0.25 times the wavelength (λ/4) of the aforementioned high frequency band. In an embodiment, the coupling gap GC1 may be less than 1 mm, but this is not a limitation of the present invention. In other embodiments, the coupling gap GC1 may also be changed to be slightly larger than 1 mm, for example, may be between 1 mm and 3 mm. The above component size ranges are based on a number of experimental results that optimize the operating band and impedance matching of the antenna structure 120. Under this design, the total length of the antenna structure 120 is about 45 mm, the total width is about 9 mm, and the overall size is about It is about 30% smaller than the traditional design.

Fig. 5A is a plan view showing a mobile device 500 according to another embodiment of the present invention. Fig. 5B is a side view showing a mobile device 500 according to another embodiment of the present invention. Figures 5A and 5B are similar to Figure 1. In the embodiment of FIGS. 5A and 5B, in addition to the grounding element 110 and the antenna structure 120, the mobile device 500 further includes a metal back cover 510. The metal back cover 510 can be part of one of the housings of the mobile device 500, wherein the metal back cover 510 is coupled to the ground element 110, and the vertical projection of the antenna structure 120 can be entirely inside the metal back cover 510. The antenna structure 120 is disposed adjacent to the metal back cover 510. Therefore, an equivalent capacitor CV is formed between the antenna structure 120 and the metal back cover 510, thereby increasing the capacitance of the antenna structure 120 and biasing its operating band. shift. To overcome this problem, the present invention uses a loop-type antenna structure 120, which itself has a high inductance (Inductance), which can be used to offset the capacitance generated when the antenna structure 120 and the metal back cover 510 are close to each other. The metal back cover 510 will not cause too much negative impact on the radiation characteristics of the antenna structure 120. On the other hand, since the high frequency resonant path PA2 of the antenna structure 120 is embedded in its low frequency resonant path PA1, the present invention can further reduce the overall size of the antenna structure 120.

The present invention provides a novel antenna structure that can be used alone to cover dual wideband operation or to be used in a mobile device having a metal back cover. When the antenna structure is applied to a mobile device having a metal back cover, it helps to reduce the negative effects of the metal back cover when it is close to the antenna structure, and maintains good communication quality of the mobile device. In addition, since it is not necessary to open any antenna window (Antenna Window) on the metal back cover, the present invention can also maintain the finish of the metal back cover. Integrity and beautify the appearance 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 (11)

A mobile device includes: a grounding element; and an antenna structure including: a half loop radiating portion having a feeding point, a first grounding point, and a second grounding point; and a first shorting portion, wherein the The first grounding point is coupled to the grounding element via the first shorting portion; a second shorting portion, wherein the second grounding point is coupled to the grounding element via the second shorting portion; a coupling extension, coupling Connected to the second shorting portion; and a parasitic radiating portion coupled to the grounding member and adjacent to the coupling extension. The mobile device of claim 1, wherein the half-loop radiating portion, the first short-circuit portion, and the grounding member collectively surround a slot region, wherein the second short-circuit portion and the coupling extend And the parasitic radiation portion is located in the slot area. The mobile device of claim 1, wherein the semi-circular radiating portion is substantially in a meander shape. The mobile device of claim 1, wherein the first short-circuit portion is substantially straight and substantially perpendicular to the half-turn radiating portion and the grounding member. The mobile device of claim 1, wherein the combination of the second short-circuit portion and the coupling extension is substantially a T-shape, and the second short circuit The portion and the half-turn radiation portion and the grounding member are substantially perpendicular to each other. The mobile device according to claim 1, wherein the parasitic radiation portion is substantially in an L shape. The mobile device of claim 1, wherein a coupling gap is formed between the coupling extension and the parasitic radiation portion, and the coupling gap is less than 1 mm or between 1 mm and 3 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 of claim 8, wherein the half loop radiation portion, the first short circuit portion, and the grounding element are excited to generate the low frequency band, and wherein the half loop radiation portion, the second portion The short circuit portion, the coupling extension portion, and the parasitic radiation portion excite the high frequency band. The mobile device of claim 8, wherein the total length of the half loop radiating portion and the first short portion is about 0.5 times the wavelength of the low frequency band, and the length of the parasitic radiating portion is about the height 0.25 times the wavelength of the frequency band. The mobile device of claim 1, further comprising: a metal back cover coupled to the ground element, wherein the antenna structure is disposed adjacent to the metal back cover.