TWI646730B - Mobile device - Google Patents

Abstract

A mobile device includes a metal back cover, a grounded metal portion, a feed metal portion, a parasitic metal portion, and a dielectric substrate. The metal back cover has an open slot. The feed metal portion extends across the open slot, wherein the first end of the feed metal portion is coupled to a signal source, and the second end of the feed metal portion is coupled to the ground metal portion. One of the first ends of the parasitic metal portion is coupled to the ground metal portion, and the second end of one of the parasitic metal portions is an open end. The ground metal portion, the feed metal portion, and the parasitic metal portion are all disposed on the dielectric substrate. The metal back cover, the feed metal portion, and the parasitic metal portion together form a slot antenna structure.

Description

Mobile device

The present invention relates to a mobile device, and more particularly to a mobile device and its slot 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 the prior art, one of the fixed size metal members is often used as the antenna body of the mobile device, and the length of the metal member is determined by the required operating frequency band. When the required operating frequency band is relatively low, it will cause the overall size of the antenna to become large, making it difficult for the mobile device to accommodate the antenna. Therefore, how to design a small-sized, wide-band antenna structure has become one of the major challenges for today's line designers.

In a preferred embodiment, the present invention provides a mobile device comprising: a metal back cover having an open slot; a grounded metal portion; a feed metal portion having a first end and a second end, and Extending across the open slot, wherein the first end of the feed metal portion is coupled to a signal source, and the second end of the feed metal portion is coupled to the ground metal portion; a parasitic metal portion Having a first end and a second end, wherein the first end of the parasitic metal portion is coupled to the ground metal portion, and the second end of the parasitic metal portion is an open end; and a dielectric substrate The ground metal portion, the feed metal portion, and the parasitic metal portion are all disposed on the dielectric substrate; wherein the metal back cover, the feed metal portion, and the parasitic metal portion together form a slot antenna structure.

In some embodiments, the feed metal portion and the ground metal portion form a loop structure, and the parasitic metal portion is surrounded by the loop structure.

In some embodiments, the parasitic metal portion has a vertical projection on the metal back cover, and the vertical projection at least partially overlaps the open slot.

In some embodiments, the slot antenna structure is operative to generate a low frequency band and a high frequency band between 2400 MHz and 2500 MHz, and the high frequency band is between 5000 MHz and 6000 MHz.

In some embodiments, the length of the open slot is approximately equal to 0.25 times the wavelength of the low frequency band.

In some embodiments, the length of the feed metal portion is approximately equal to 0.25 times the wavelength of the low frequency band.

In some embodiments, the length of the parasitic metal portion is approximately equal to 0.25 times the wavelength of the high frequency band.

In some embodiments, the metal back cover has a first edge and a second edge that are perpendicular to each other, and the open slot is substantially parallel and adjacent to the first edge.

In some embodiments, the distance between the open slot and the first edge of the metal back cover is less than 6 mm.

In some embodiments, the distance between the feed metal portion and the second edge of the metal back cover is greater than 4 mm.

100‧‧‧ mobile devices

110‧‧‧Metal back cover

111‧‧‧The first edge of the metal back cover

112‧‧‧The second edge of the metal back cover

120‧‧‧Open slot

121‧‧‧Open end of open slot

122‧‧‧Closed end of open slot

130‧‧‧Grounded metal parts

140‧‧‧Feed in the Metals Department

141‧‧‧Feed into the first end of the metal part

142‧‧‧Feed into the second end of the metal part

150‧‧‧Parasitic Metals Division

151‧‧‧The first end of the parasitic metal department

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

160‧‧‧Media substrate

170‧‧‧ Non-conductive support carrier

180‧‧‧Top area above the display

190‧‧‧Signal source

D1, D2, D3, D4‧‧‧ spacing

The total length of the L1‧‧‧ dielectric substrate

1A is a plan view showing a mobile device according to an embodiment of the present invention; FIG. 1B is a side view showing a mobile device according to an embodiment of the present invention; and FIG. 1C is a view showing an embodiment of the present invention; FIG. 2A is a diagram showing a return loss when the mobile device operates in a notebook mode according to an embodiment of the invention; and FIG. 2B is a view showing an embodiment of the present invention. An antenna efficiency map when the mobile device operates in a notebook mode; FIG. 3A is a diagram showing a return loss when the mobile device operates in a tablet mode according to an embodiment of the invention; and FIG. 3B shows a first embodiment according to the present invention The antenna efficiency map of the mobile device according to the embodiment when operating in the tablet mode.

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.

FIG. 1A is a plan view showing a mobile device 100 according to an embodiment of the present invention. FIG. 1B is a side view showing a mobile device 100 according to an embodiment of the present invention. The mobile device 100 can be a notebook computer, a tablet computer, or a combination of the two. Please refer to Figures 1A and 1B together. In the embodiment of FIGS. 1A and 1B, the mobile device 100 includes: a metal back cover 110, a grounding metal element 130, and a feed. A feeding metal element 140, a parasitic metal element 150, and a dielectric substrate 160 are included. It should be noted that although not shown in FIGS. 1A and 1B, the mobile device 100 may further include other components, such as a display, a touch module, a battery module, a keyboard, and a casing.

The metal back cover 110 can be an upper cover of a notebook computer. The metal back cover 110 has an open slot 120. The open slot 120 has an open end 121 and a closed end 122 and may be substantially straight. In some embodiments, the open slot 120 can be filled with a non-conductor material, such as a plastic strip. In detail, the metal back cover 110 has a first edge 111 and a second edge 112 perpendicular to each other, wherein the open slot 120 is substantially parallel and adjacent to the first edge 111 of the metal back cover 110, and the open slot 120 The open end 121 is located on the second edge 112 of the metal back cover 110. The ground metal portion 130 can be a grounded copper foil that can be coupled to a system ground plane (not shown). The feed metal portion 140 may be substantially C-shaped and extend across the open slot 120 of the metal back cover 110. In detail, the feeding metal portion 140 has a first end 141 and a second end 142, wherein the first end 141 of the feeding metal portion 140 is coupled to a signal source 190, and the metal portion 140 is fed. The two ends 142 are coupled to the grounding metal portion 130 such that the feeding metal portion 140 and the grounding metal portion 130 together form a loop structure. The parasitic metal portion 150 may be substantially an L shape or a J shape. In detail, the parasitic metal portion 150 has a first end 151 and a second end 152, wherein the first end 151 of the parasitic metal portion 150 is coupled to the ground metal portion 130, and the second end 152 of the parasitic metal portion 150 is It is an Open End. In some embodiments, the parasitic metal portion 150 further includes an extension toward the grounded metal portion 130 One end bends. The parasitic metal portion 150 is surrounded by the aforementioned loop structure formed by both the feed metal portion 140 and the ground metal portion 130. The parasitic metal portion 150 has a vertical projection on the metal back cover 110, wherein the vertical projection of the parasitic metal portion 150 at least partially overlaps the open slot 120 of the metal back cover 110. Similarly, the feed metal portion 140 also has a vertical projection on the metal back cover 110, wherein the vertical projection of the feed metal portion 140 and the open slot 120 of the metal back cover 110 also at least partially overlap. The dielectric substrate 160 can be a printed circuit board (PCB) or a FR4 (Flame Retardant 4) substrate. The dielectric substrate 160 is disposed above the metal back cover 110 and adjacent to the metal back cover 110. The ground metal portion 130, the feed metal portion 140, and the parasitic metal portion 150 are disposed on the dielectric substrate 160. In some embodiments, the mobile device 100 further includes a non-conductive support carrier (Nonconductive Supporting Carrier) 170, which can be located between the open slot 120 of the metal back cover 110 and the dielectric substrate 160, and is used for carrying and fixing the dielectric substrate. 160. In general, in the mobile device 100, the metal back cover 110 (and its open slot 120), the feed metal portion 140, and the parasitic metal portion 150 may collectively form a slot antenna structure. The signal source 190 can be a radio frequency (RF) module and used to excite the slot antenna structure.

According to actual measurement results, the slot antenna structure can operate in a low frequency band and a high frequency band, wherein the low frequency band can be between 2400 MHz and 2500 MHz, and the high frequency band can be between 5000 MHz and 6000 MHz. Therefore, the slot antenna structure of the mobile device 100 can cover at least WLAN (Wireless Local Area Network) 2.4 GHz/5 GHz dual band operation.

In terms of antenna principle, the metal portion 140 and the metal back cover 110 are fed. The open slots 120 can be collectively excited to generate the aforementioned low frequency band, and the feed metal portion 140 and the parasitic metal portion 150 can be collectively excited to generate the aforementioned high frequency band. The parasitic metal portion 150 has an effect of increasing the bandwidth of the aforementioned high frequency band. It should be noted that since the feeding metal portion 140 and the grounding metal portion 130 can collectively form a loop structure to excite the open slot 120 of the metal back cover 110, this will further contribute to the overall size of the micro-dielectric substrate 160, and at the same time The metal portion on the dielectric substrate 160 is prevented from being disturbed by a mechanism retention region on the left side of the metal back cover 110. The design of the present invention can shorten the total length L1 of the dielectric substrate 160 and the metal portion thereon from the original 25 mm to 15 mm (the improvement range is almost the same as that of the conventional monopole-shaped metal portion). 40%) Therefore, the present invention is well suited for use in various miniaturized mobile communication devices.

In some embodiments, the component dimensions of the mobile device 100 can be as described below. The length of the open slot 120 of the metal back cover 110 (i.e., the length from the open end 121 to the closed end 122) is substantially equal to 0.25 times the wavelength (λ/4) of the aforementioned low frequency band. The length of the feed metal portion 140 (i.e., the length from the first end 141 to the second end 142) is substantially equal to 0.25 times the wavelength (λ/4) of the aforementioned low frequency band. The length of the parasitic metal portion 150 (i.e., the length from the first end 151 to the second end 152) is approximately equal to 0.25 times the wavelength (λ/4) of the aforementioned high frequency band. The distance between the open slot 120 of the metal back cover 110 and the first edge 111 is less than 6 mm. The distance D2 between the feed metal portion 140 and the second edge 112 of the metal back cover 110 is greater than 4 mm. The distance between the feed metal portion 140 and the closed end 122 of the open slot 120 is greater than 0.5 mm from the D3 system. The distance between the ground metal portion 130, the feed metal portion 140, and the parasitic metal portion 150 and the metal back cover 110 is less than 1 mm from the D4 (coupling gap) to effectively excite the open slot 120 of the metal back cover 110. The total length of the dielectric substrate 160 L1 is approximately equal to 15 mm and the total width is approximately 8.3 mm. The range of the above component sizes is calculated based on a number of experimental results that help optimize the Impedance Matching of the slot antenna structure of the mobile device 100.

FIG. 1C is a diagram showing the operation of the mobile device 100 in different modes according to an embodiment of the invention. In the embodiment of FIG. 1C, the mobile device 100 is a Convertible Notebook Computer, which can operate in a notebook mode or a tablet mode, and the slot thereof. The antenna structure is located in an area 180 above the display.

FIG. 2A is a diagram showing a Return Loss diagram when the mobile device 100 operates in a notebook mode 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. 2A, when the mobile device 100 is used as a notebook computer, the slot antenna structure can excite a low frequency band between 2400 MHz and 2500 MHz, and a high frequency band between 5000 MHz and 6000 MHz. This supports dual-band operation of WLAN 2.4GHz/5GHz.

2B is a diagram showing an antenna efficiency (Antenna Efficiency) when the mobile device 100 operates in a notebook mode 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. 2B, when the mobile device 100 is used as a notebook computer, the antenna efficiency of the slot antenna structure can reach about -3.5 dB in the low frequency band and about -5 dB in the high frequency band. This has met the practical application requirements of general mobile communication devices.

3A is a view showing a mobile device according to an embodiment of the present invention. The return loss map when 100 is operated in the tablet mode, where the horizontal axis represents the operating frequency (MHz) and the vertical axis represents the return loss (dB). As shown in FIG. 3A, when the mobile device 100 is used as a tablet computer, the slot antenna structure can excite a low frequency band between 2400 MHz and 2500 MHz, and a high frequency band between 5000 MHz and 6000 MHz. Supports dual-band operation of WLAN 2.4GHz/5GHz.

FIG. 3B is a diagram showing an antenna efficiency diagram of the mobile device 100 operating in the tablet mode 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. 3B, when the mobile device 100 is used as a tablet computer, the antenna efficiency of the slot antenna structure can reach about -4 dB in the low frequency band and about -5.5 dB in the high frequency band. It can meet the practical application requirements of general mobile communication devices.

According to the measurement results of FIGS. 2A, 2B, 3A, and 3B, it can be seen that, under the design of the present invention, whether the mobile device 100 operates in the notebook mode or the tablet mode, it is not easy to adversely affect the radiation performance of the slot antenna structure. Therefore, the present invention is well suited for use in a variety of deformable or two-in-one mobile communication devices and provides good antenna bandwidth and antenna radiation efficiency.

The invention provides a novel mobile device and a slot antenna structure thereof, which at least comprises the following advantages compared with the conventional technology: (1) the overall length of the dielectric substrate and the upper metal portion thereof can be greatly shortened; (2) the broadband can be covered. Band and multi-band operation; and (3) good antenna radiation performance can be maintained in different modes of use of mobile devices.

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 Different settings need to be adjusted. The mobile device and slot antenna structure of the present invention are not limited to the state illustrated in Figures 1-3. The present invention may include only any one or more of the features of any one or a plurality of embodiments of Figures 1-3. In other words, not all of the illustrated features must be implemented simultaneously in the mobile device and slot 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 (8)

A mobile device includes: a metal back cover having an open slot, wherein the open slot has an open end and a closed end; a grounded metal portion; a feed metal portion having a first end and a first end a second end, and extending across the open slot, wherein the first end of the feed metal portion is coupled to a signal source, and the second end of the feed metal portion is coupled to the ground metal portion; a parasitic metal portion having a first end and a second end, wherein the first end of the parasitic metal portion is coupled to the ground metal portion, and the second end of the parasitic metal portion is an open end; And a dielectric substrate, wherein the ground metal portion, the feed metal portion, and the parasitic metal portion are disposed on the dielectric substrate; wherein the metal back cover, the feed metal portion, and the parasitic metal portion are formed together a slot antenna structure; wherein the slot antenna structure is excited to generate 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 5000 MHz and 6000 MHz; The parasitic metal part The length is equal to 0.25 times the wavelength of the high frequency band. The mobile device of claim 1, wherein the feed metal portion and the ground metal portion form a loop structure, and the parasitic metal portion is surrounded by the loop structure. The mobile device according to claim 1, wherein the parasitic gold The genus has a vertical projection on the metal back cover, and the vertical projection at least partially overlaps the open slot. The mobile device of claim 1, wherein the length of the open slot is equal to 0.25 times the wavelength of the low frequency band. The mobile device of claim 1, wherein the length of the feed metal portion is equal to 0.25 times the wavelength of the low frequency band. The mobile device of claim 1, wherein the metal back cover has a first edge and a second edge perpendicular to each other, and the open slot is parallel and adjacent to the first edge. The mobile device of claim 6, wherein the distance between the open slot and the first edge of the metal back cover is less than 6 mm. The mobile device of claim 6, wherein the distance between the feed metal portion and the second edge of the metal back cover is greater than 4 mm.