TWI857672B - Mobile device supporting wideband operation - Google Patents

Abstract

A mobile device supporting wideband operations includes a feeding radiation element, a first radiation element, a first shorting radiation element, a second shorting radiation element, a second radiation element, a third radiation element, and a connection radiation element. The feeding radiation element has a feeding point. The first radiation element is coupled to the feeding radiation element. The first shorting radiation element is coupled to a ground voltage. The second shorting radiation element is coupled to the ground voltage. The second radiation element is coupled to the second shorting radiation element. The second shorting radiation element is coupled through the third radiation element to the first shorting radiation element. An antenna structure is formed by the feeding radiation element, the first radiation element, the first shorting radiation element, the second shorting radiation element, the second radiation element, the third radiation element, and the connection radiation element.

Description

Mobile devices that support broadband operation

The present invention relates to a mobile device, and more particularly to a mobile device capable of supporting broadband operation.

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

Antennas are essential components in the field of wireless communications. If the operational bandwidth of an antenna used to receive or transmit signals is too narrow, it will easily cause the communication quality of mobile devices to deteriorate. Therefore, how to design a small-sized, wide-bandwidth antenna structure is an important issue for designers.

In a preferred embodiment, the present invention provides a mobile device supporting broadband operation, comprising: a feeding radiation part having a feeding point; a first radiation part coupled to the feeding radiation part; a first short-circuit radiation part coupled to a ground potential; a second short-circuit radiation part coupled to the ground potential; a second radiation part coupled to the second short-circuit radiation part; a third radiation part, wherein the second short-circuit radiation part is coupled to the first short-circuit radiation part via the third radiation part. a short-circuit radiation portion; and a connecting radiation portion, wherein the feed radiation portion, the first radiation portion, the first short-circuit radiation portion, the second short-circuit radiation portion, the second radiation portion, and the third radiation portion are further coupled to each other via the connecting radiation portion; wherein the feed radiation portion, the first radiation portion, the first short-circuit radiation portion, the second short-circuit radiation portion, the second radiation portion, the third radiation portion, and the connecting radiation portion together form an antenna structure.

In some embodiments, the mobile device further includes: a dielectric substrate, wherein the feed radiation portion, the first radiation portion, the first short-circuit radiation portion, the second short-circuit radiation portion, the second radiation portion, the third radiation portion, and the connection radiation portion are all disposed on the same surface of the dielectric substrate.

In some embodiments, the antenna structure covers a first frequency band, a second frequency band, and a third frequency band, the first frequency band is between 2400 MHz and 2500 MHz, the second frequency band is between 5150 MHz and 5850 MHz, and the third frequency band is between 5925 MHz and 7125 MHz.

In some embodiments, the total length of the second short-circuit radiating portion and the second radiating portion is substantially equal to 0.25 times the wavelength of the first frequency band.

In some embodiments, the total length of the feed radiation portion, the connecting radiation portion, and the second radiation portion is substantially equal to 0.25 times the wavelength of the first frequency band.

In some embodiments, the total length of the feed radiation portion and the first radiation portion is approximately equal to 0.25 times the wavelength of the second frequency band.

In some embodiments, the total length of the second short-circuit radiating portion and the third radiating portion is substantially equal to 0.25 times the wavelength of the third frequency band.

In some embodiments, the total length of the feed radiation portion, the connection radiation portion, and the second short-circuit radiation portion is substantially equal to 0.5 times the wavelength of the third frequency band.

In some embodiments, a first gap is formed between the second radiation portion and the first radiation portion, and a second gap is formed between the first short-circuit radiation portion and the feed radiation portion.

In some embodiments, the mobile device further includes: a non-conductive supporting element having a first surface and a second surface opposite to each other; a glass element disposed on the first surface of the non-conductive supporting element, wherein the antenna structure is disposed on the second surface of the non-conductive supporting element; and a metal base housing connected to the non-conductive supporting element, wherein the metal base housing is adjacent to the antenna structure.

In order to make the purpose, features and advantages of the present invention more clearly understood, specific embodiments of the present invention are specifically listed below and described in detail with reference to the accompanying drawings.

Certain terms are used in the specification and patent application to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. This specification and patent application do not use differences in names as a way to distinguish components, but use differences in the functions of components as the criterion for distinction. The words "include" and "including" mentioned throughout the specification and patent application are open terms and should be interpreted as "including but not limited to". The word "substantially" means that within an acceptable error range, those skilled in the art can solve the technical problem within a certain error range and achieve the basic technical effect. In addition, the word "coupled" in this specification includes any direct and indirect electrical connection means. Therefore, if a first device is described herein as being coupled to a second device, it means that the first device may be directly electrically connected to the second device, or may be indirectly electrically connected to the second device via other devices or connection means.

The following disclosure provides many different embodiments or examples for implementing different features of the present invention. The following disclosure describes specific examples of various components and their arrangements to simplify the description. Of course, these specific examples are not intended to be limiting. For example, if the present disclosure describes a first feature formed on or above a second feature, it means that it may include an embodiment in which the first feature and the second feature are in direct contact, and may also include an embodiment in which an additional feature is formed between the first feature and the second feature, so that the first feature and the second feature may not be in direct contact. In addition, the same reference symbols and/or marks may be reused in different examples of the following disclosure. These repetitions are for the purpose of simplification and clarity, and are not intended to limit the specific relationship between the different embodiments and/or structures discussed.

In addition, spatially related terms such as "below," "below," "lower," "above," "higher," and similar terms are used to facilitate description of the relationship between one element or feature and another element or features in the diagram. In addition to the orientation shown in the drawings, these spatially related terms are intended to include different orientations of the device in use or operation. The device may be rotated to different orientations (rotated 90 degrees or other orientations), and the spatially related terms used herein may be interpreted accordingly.

FIG. 1 is a top view of a mobile device 100 according to an embodiment of the present invention. For example, the mobile device 100 may be a smart phone, a tablet computer, or a notebook computer. As shown in FIG. 1 , the mobile device 100 at least includes: a feeding radiation element 110, a first radiation element 120, a first short-circuit radiation element 130, a second short-circuit radiation element 140, a second radiation element 150, a third radiation element 160, and a connection radiation element 170, wherein the feeding radiation element 110, the first radiation element 120, the first short-circuit radiation element 130, the second short-circuit radiation element 140, the second radiation element 150, the third radiation element 160, and the connection radiation element 170 can all be made of metal materials, such as copper, silver, aluminum, iron, or alloys thereof. It should be understood that, although not shown in FIG. 1 , the mobile device 100 may further include other components, such as a processor, a touch control panel, a speaker, a power supply module, or (and) a housing.

The feeding radiation part 110 may be substantially in the shape of a straight bar. Specifically, the feeding radiation part 110 has a first end 111 and a second end 112, wherein a feeding point FP is located at the first end 111 of the feeding radiation part 110. The feeding point FP may be further coupled to a signal source 199. For example, the signal source 199 may be a radio frequency (RF) module.

The first radiation portion 120 may be substantially in the shape of another straight strip, and may be substantially perpendicular to the feeding radiation portion 110. In detail, the first radiation portion 120 has a first end 121 and a second end 122, wherein the first end 121 of the first radiation portion 120 is coupled to the second end 112 of the feeding radiation portion 110, and the second end 122 of the first radiation portion 120 is an open end.

The first short-circuit radiating portion 130 may be substantially rectangular. Specifically, the first short-circuit radiating portion 130 has a first end 131 and a second end 132, wherein a first grounding point GP1 is located at the first end 131 of the first short-circuit radiating portion 130. The first grounding point GP1 may be further coupled to a ground voltage VSS. For example, the ground voltage VSS may be provided by a system ground plane of the mobile device 100 (not shown).

The second short-circuit radiation portion 140 may be substantially in the shape of a straight strip. Specifically, the second short-circuit radiation portion 140 has a first end 141 and a second end 142, wherein a second ground point GP2 is located at the first end 141 of the second short-circuit radiation portion 140. The second ground point GP2 may be further coupled to the aforementioned ground potential VSS. It should be noted that the second ground point GP2 may be located relatively far from the feed point FP. In some embodiments, the second short-circuit radiation portion 140 may be aligned with the feed radiation portion 110, that is, the two may be substantially located on the same straight line.

The second radiating portion 150 may be substantially in the shape of a relatively wide straight strip, and may be substantially perpendicular to the second short-circuit radiating portion 140, and may be substantially parallel to the first radiating portion 120. In detail, the second radiating portion 150 has a first end 151 and a second end 152, wherein the first end 151 of the second radiating portion 150 is coupled to the second end 142 of the second short-circuit radiating portion 140, and the second end 152 of the second radiating portion 150 is an open end. For example, the second end 152 of the second radiating portion 150 and the second end 122 of the first radiating portion 120 may extend substantially in the same direction.

In some embodiments, a first gap G1 may be formed between the second radiation portion 150 and the first radiation portion 120, which may be regarded as a first notch region. In addition, in some embodiments, a second gap G2 may be formed between the first short-circuit radiation portion 130 and the feed radiation portion 110, which may be regarded as a second notch region.

The third radiating portion 160 may be substantially in another wide straight strip shape, and may be substantially perpendicular to the second short-circuit radiating portion 140. Specifically, the third radiating portion 160 has a first end 161 and a second end 162, wherein the first end 161 of the third radiating portion 160 is coupled to the second end 142 of the second short-circuit radiating portion 140, and the second end 162 of the third radiating portion 160 is coupled to the second end 132 of the first short-circuit radiating portion 130. That is, the second short-circuit radiating portion 140 may be coupled to the first short-circuit radiating portion 130 via the third radiating portion 160.

The connecting radiation part 170 may be substantially L-shaped. It should be noted that the feeding radiation part 110 , the first radiation part 120 , the first short-circuit radiation part 130 , the second short-circuit radiation part 140 , the second radiation part 150 , and the third radiation part 160 may be coupled to each other via the connecting radiation part 170 .

In some embodiments, the mobile device 100 further includes a dielectric substrate 180. For example, the dielectric substrate 180 may be a FR4 (Flame Retardant 4) substrate, a printed circuit board (PCB), or a flexible printed circuit (FPC). The aforementioned feed radiation part 110, the first radiation part 120, the first short-circuit radiation part 130, the second short-circuit radiation part 140, the second radiation part 150, the third radiation part 160, and the connection radiation part 170 may all be disposed on the same surface E1 of the dielectric substrate 180. It should be understood that the dielectric substrate 180 is an optional element and may be removed in other embodiments.

In a preferred embodiment, the feed radiation part 110, the first radiation part 120, the first short-circuit radiation part 130, the second short-circuit radiation part 140, the second radiation part 150, the third radiation part 160, and the connection radiation part 170 can together form an antenna structure 190 of the mobile device 100. For example, the antenna structure 190 can be a planar antenna structure. However, the present invention is not limited thereto. In other embodiments, the antenna structure 190 can also be modified into a three-dimensional (3D) antenna structure.

Figure 2 shows the return loss of the antenna structure of a traditional mobile device, where the horizontal axis represents the operating frequency (MHz) and the vertical axis represents the return loss (dB). As shown in Figure 2, when the traditional antenna structure is close to a metal element, its radiation performance is often severely negatively affected, resulting in its inability to cover the required broadband operation.

FIG. 3 is a graph showing the return loss of the antenna structure 190 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). According to the measurement results of FIG. 3, the antenna structure 190 of the mobile device 100 can cover a first frequency band FB1, a second frequency band FB2, and a third frequency band FB3. For example, the first frequency band FB1 can be between 2400MHz and 2500MHz, the second frequency band FB2 can be between 5150MHz and 5850MHz, and the third frequency band FB3 can be between 5925MHz and 7125MHz. Therefore, the mobile device 100 will at least be able to support broadband operations of traditional WLAN (Wireless Local Area Network) and the new generation Wi-Fi 6E.

In some embodiments, the operating principle of the antenna structure 190 of the mobile device 100 can be described as follows. According to the actual measured current distribution, the second ground point GP2 of the second short-circuit radiation portion 140 can be regarded as another feeding point of the antenna structure 190, which can be used to reduce the interference caused by the adjacent metal components. The feeding radiation portion 110, the second short-circuit radiation portion 140, the second radiation portion 150, and the connecting radiation portion 170 can jointly excite to generate the aforementioned first frequency band FB1. The feeding radiation portion 110, the first radiation portion 120, the second short-circuit radiation portion 140, and the second radiation portion 150 can jointly excite to generate the aforementioned second frequency band FB2. The feed radiation part 110, the second short-circuit radiation part 140, the third radiation part 160, and the connection radiation part 170 can jointly generate the aforementioned third frequency band FB3. In addition, the design of the first gap G1 and the second gap G2 helps to fine-tune the impedance matching of the aforementioned first frequency band FB1, the second frequency band FB2, and the third frequency band FB3.

In some embodiments, the dimensions of the components of the mobile device 100 may be as follows. The total length L1 of the second short-circuit radiating portion 140 and the second radiating portion 150 may be approximately equal to 0.25 times the wavelength (λ/4) of the first frequency band FB1 of the antenna structure 190 of the mobile device 100. Alternatively, the total length L1 of the second short-circuit radiating portion 140 and the second radiating portion 150 may be approximately equal to 0.5 times the wavelength (λ/2) of the second frequency band FB2 of the antenna structure 190 of the mobile device 100. The total length L2 of the feed radiating portion 110, the connecting radiating portion 170, and the second radiating portion 150 may be approximately equal to 0.25 times the wavelength (λ/4) of the first frequency band FB1 of the antenna structure 190 of the mobile device 100. The total length L3 of the feed radiation portion 110 and the first radiation portion 120 may be approximately equal to 0.25 times the wavelength (λ/4) of the second frequency band FB2 of the antenna structure 190 of the mobile device 100. The total length L4 of the second short-circuit radiation portion 140 and the third radiation portion 160 may be approximately equal to 0.25 times the wavelength (λ/4) of the third frequency band FB3 of the antenna structure 190 of the mobile device 100. The total length L5 of the feed radiation portion 110, the connection radiation portion 170, and the second short-circuit radiation portion 140 may be approximately equal to 0.5 times the wavelength (λ/2) of the third frequency band FB3 of the antenna structure 190 of the mobile device 100. The distance between the second ground point GP2 and the feed point FP may be greater than or equal to 10 mm. The width of the first gap G1 may be between 2 mm and 3 mm. The width of the second gap G2 may be between 2 mm and 3 mm. The above size range is obtained based on multiple experimental results, which helps to optimize the operational bandwidth and impedance matching of the antenna structure 190 of the mobile device 100.

The following will introduce different configurations and detailed structural features of the mobile device 100. It must be understood that these drawings and descriptions are only examples and are not intended to limit the present invention.

FIG. 4 is a cross-sectional view of a mobile device 400 according to another embodiment of the present invention. FIG. 4 is similar to FIG. 1. In the embodiment of FIG. 4, in addition to the aforementioned antenna structure 190, the mobile device 400 further includes a glass element 410, a nonconductive support element 420, and a metal base housing 430. The glass element 410 may be a glass board. The nonconductive support element 420 has a first surface E2 and a second surface E3 opposite to each other, wherein the glass element 410 is disposed on the first surface E2 of the nonconductive support element 420, and the antenna structure 190 is disposed on the second surface E3 of the nonconductive support element 420. However, the present invention is not limited thereto. In some other embodiments, the antenna structure 190 may also be first disposed on the dielectric substrate 180 , and the dielectric substrate 180 may be further disposed on the second surface E3 of the non-conductive supporting element 420 .

The metal base housing 430 is connected to the non-conductive support element 420, wherein the metal base housing 430 is adjacent to the antenna structure 190. 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., 10 mm or shorter), but generally does not include a situation where the two corresponding elements are in direct contact with each other (i.e., the aforementioned distance is shortened to 0). Since the metal base housing 430 has a retraction cutting design, the distance D1 between the metal base housing 430 and the antenna structure 190 will become relatively small (e.g., the aforementioned distance D1 may be less than or equal to 2 mm). It should be understood that the glass component 410 and the non-conductive support component 420 may be collectively considered as what is commonly known as the "C component" in the field of notebook computers, while the metal base housing 430 may be considered as what is commonly known as the "D component" in the field of notebook computers.

According to actual measurement results, after introducing the design of the present invention, the return loss diagram of the antenna structure 190 of the mobile device 400 will be similar to the measurement result of Figure 3, that is, it is less likely to be disturbed by the metal base shell 430. In other words, the antenna structure 190 proposed by the present invention can be applied to different operating environments and can take into account both the aesthetics of the device and the improvement of the overall communication quality. The remaining features of the mobile device 400 in Figure 4 are similar to those of the mobile device 100 in Figure 1, so both embodiments can achieve similar operating effects.

FIG. 5 is a perspective view of a laptop computer 500 according to another embodiment of the present invention. In the embodiment of FIG. 5, the aforementioned antenna structure 190 can be applied to the laptop computer 500, wherein the laptop computer 500 includes an upper cover housing 510, a display frame 520, a keyboard frame 530, and a base housing 540. It should be understood that the upper cover housing 510, the display frame 520, the keyboard frame 530, and the base housing 540 are respectively equivalent to the so-called "A part", "B part", "C part", and "D part" in the field of laptop computers. For example, the antenna structure 190 can be disposed between the keyboard frame 530 and the base housing 540 and can be adjacent to a first position 561 or a second position 562 of the notebook computer 500. According to actual measurement results, this configuration helps to improve the overall communication quality of the notebook computer 500.

The present invention proposes a novel mobile device and antenna structure thereof. Compared with the traditional design, the present invention has at least the advantages of small size, wide bandwidth, low manufacturing cost, and good communication quality, so it is very suitable for application in various communication devices.

It is worth noting that the above-mentioned component size, component shape, and frequency range are not limiting conditions of the present invention. Antenna designers can adjust these settings according to different needs. The mobile device of the present invention is not limited to the states shown in Figures 1-5. The present invention may include only one or more features of any one or more embodiments of Figures 1-5. In other words, not all the features shown in the diagrams need to be implemented in the mobile device of the present invention at the same time.

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 mark and distinguish two different components with the same name.

Although the present invention is disclosed as above with the preferred embodiments, it is not intended to limit the scope of the present invention. Anyone skilled in the art can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the attached patent application.

100,400: mobile device 110: feed radiation section 111: first end of feed radiation section 112: second end of feed radiation section 120: first radiation section 121: first end of first radiation section 122: second end of first radiation section 130: first short-circuit radiation section 131: first end of first short-circuit radiation section 132: second end of first short-circuit radiation section 140: second short-circuit radiation section 141: first end of second short-circuit radiation section 142: second end of second short-circuit radiation section 150: second radiation section 151: first end of second radiation section 152: second end of second radiation section 160: third radiating portion 161: first end of third radiating portion 162: second end of third radiating portion 170: connecting radiating portion 180: dielectric substrate 190: antenna structure 199: signal source 410: glass element 420: non-conductive supporting element 430: metal base housing 500: notebook computer 510: upper cover housing 520: display frame 530: keyboard frame 540: base housing 561: first position 562: second position D1: distance E1: surface E2: first surface E3: second surface FB1: first frequency band FB2: second frequency band FB3: Third frequency band FP: Feed point G1: First gap G2: Second gap GP1: First ground point GP2: Second ground point L1, L2, L3, L4, L5: Length VSS: Ground potential

FIG. 1 is a top view of a mobile device according to an embodiment of the present invention. FIG. 2 is a return loss diagram of an antenna structure of a conventional mobile device. FIG. 3 is a return loss diagram of an antenna structure of a mobile device according to an embodiment of the present invention. FIG. 4 is a cross-sectional view of a mobile device according to another embodiment of the present invention. FIG. 5 is a three-dimensional view of a laptop computer according to another embodiment of the present invention.

100: Mobile devices

110: Feed Radiation Department

111: The first end of the feed radiation unit

112: Feed the second end of the radiation unit

120: First Radiation Division

121: The first end of the first radiation section

122: The second end of the first radiation section

130: First short-circuit radiation unit

131: The first end of the first short-circuit radiation unit

132: The second end of the first short-circuit radiation unit

140: Second short-circuit radiation unit

141: The first end of the second short-circuit radiation unit

142: The second end of the second short-circuit radiation unit

150: Second Radiation Division

151: The first end of the second radiation section

152: The second end of the second radiation section

160: The Third Radiation Division

161: The first end of the third radiation section

162: The second end of the third radiation section

170: Connect to the radiation unit

180: Dielectric substrate

190: Antenna structure

199:Signal source

E1: Surface

FP: Feed Point

G1: First gap

G2: Second gap

GP1: First grounding point

GP2: Second grounding point

L1,L2,L3,L4,L5: Length

VSS: ground potential

Claims (9)

A mobile device supporting broadband operation includes: a feeding radiation part having a feeding point; a first radiation part coupled to the feeding radiation part; a first short-circuit radiation part coupled to a ground potential; a second short-circuit radiation part coupled to the ground potential; a second radiation part coupled to the second short-circuit radiation part; a third radiation part, wherein the second short-circuit radiation part is coupled to the first short-circuit radiation part via the third radiation part; and a connecting radiation part, wherein the feeding radiation part, the first radiation part, The first short-circuit radiation part, the second short-circuit radiation part, the second radiation part, and the third radiation part are further coupled to each other via the connecting radiation part; wherein the feeding radiation part, the first radiation part, the first short-circuit radiation part, the second short-circuit radiation part, the second radiation part, the third radiation part, and the connecting radiation part together form an antenna structure; wherein a first gap is formed between the second radiation part and the first radiation part, and a second gap is formed between the first short-circuit radiation part and the feeding radiation part. The mobile device of claim 1 further comprises: a dielectric substrate, wherein the feed radiation portion, the first radiation portion, the first short-circuit radiation portion, the second short-circuit radiation portion, the second radiation portion, the third radiation portion, and the connection radiation portion are all disposed on the same surface of the dielectric substrate. A mobile device as claimed in claim 1, wherein the antenna structure covers a first frequency band, a second frequency band, and a third frequency band, the first frequency band is between 2400 MHz and 2500 MHz, the second frequency band is between 5150 MHz and 5850 MHz, and the third frequency band is between 5925 MHz and 7125 MHz. A mobile device as claimed in claim 3, wherein the total length of the second short-circuit radiation portion and the second radiation portion is approximately equal to 0.25 times the wavelength of the first frequency band. A mobile device as claimed in claim 3, wherein the total length of the feed radiation portion, the connecting radiation portion, and the second radiation portion is approximately equal to 0.25 times the wavelength of the first frequency band. A mobile device as claimed in claim 3, wherein the total length of the feed radiation portion and the first radiation portion is approximately equal to 0.25 times the wavelength of the second frequency band. A mobile device as claimed in claim 3, wherein the total length of the second short-circuit radiation portion and the third radiation portion is approximately equal to 0.25 times the wavelength of the third frequency band. As in claim 3, the total length of the feed radiation portion, the connection radiation portion, and the second short-circuit radiation portion is approximately equal to 0.5 times the wavelength of the third frequency band. The mobile device of claim 1 further comprises: a non-conductive support element having a first surface and a second surface opposite to each other; a glass element disposed on the first surface of the non-conductive support element, wherein the antenna structure is disposed on the second surface of the non-conductive support element; and a metal base housing connected to the non-conductive support element, wherein the metal base housing is adjacent to the antenna structure.

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