TWI736387B - Mobile device - Google Patents

Abstract

A mobile device includes a ground element, a first radiation element, a second radiation element, a third radiation element, a fourth radiation element, and a dielectric substrate. The first radiation element is coupled to the ground element. The second radiation element has a feeding point, and is coupled to the ground element. The third radiation element is coupled to the second radiation element. The first radiation element is adjacent to the second radiation element and the third radiation element. The fourth radiation element is coupled to the second radiation element. A non-metal closed region is surrounded by the second radiation element and the fourth radiation element. The ground element, the first radiation element, the second radiation element, the third radiation element, and the fourth radiation element are disposed on the dielectric substrate. An antenna structure is formed by the ground element, the first radiation element, the second radiation element, the third radiation element, the fourth radiation element, and the dielectric substrate.

Description

Mobile device

The present invention relates to a mobile device, in particular to a mobile device and its antenna structure.

With the development of mobile communication technology, mobile devices have become more and more common 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 wireless communication functions. Some cover long-distance wireless communication ranges, for example: mobile phones use 2G, 3G, LTE (Long Term Evolution) systems and their use of 700MHz, 850 MHz, 900MHz, 1800MHz, 1900MHz, 2100MHz, 2300MHz, and 2500MHz frequency bands for communication. Some cover short-distance wireless communication ranges, for example: Wi-Fi, Bluetooth systems use 2.4GHz, 5.2GHz and 5.8GHz frequency bands for communication.

The antenna is an indispensable component in the field of wireless communication. If the bandwidth of the antenna used for receiving or transmitting signals is insufficient, it is easy to cause the communication quality of the mobile device to deteriorate. Therefore, how to design a small-sized, wide-band antenna element is an important issue for antenna designers.

In a preferred embodiment, the present invention provides a mobile device including: a ground element; a first radiating part coupled to the ground element; a second radiating part having a feeding point and coupled to the ground element; Grounding element; a third radiating portion, coupled to the second radiating portion, wherein the first radiating portion is adjacent to the second radiating portion and the third radiating portion; a fourth radiating portion, coupled to the first radiating portion Two radiating parts, wherein the second radiating part and the fourth radiating part surround a non-metal enclosed area; and a dielectric substrate, wherein the grounding element, the first radiating part, the second radiating part, and the third radiating part Part, and the fourth radiating part are all disposed on the dielectric substrate; wherein the ground element, the first radiating part, the second radiating part, the third radiating part, the fourth radiating part, and the dielectric substrate are common Form an antenna structure.

In some embodiments, the first radiating portion exhibits a serpentine shape.

In some embodiments, the non-metallic enclosed area is rectangular.

In some embodiments, the third radiating portion and the fourth radiating portion each present a straight strip shape, and extend substantially in opposite directions.

In some embodiments, the mobile device further includes: a fifth radiating part coupled to the first radiating part, wherein the third radiating part and the fifth radiating part generally extend toward each other.

In some embodiments, the total height of the antenna structure is less than or equal to 4 mm.

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 2400MHz and 2500MHz, and the second frequency band is between 5150MHz and 5850MHz. The third frequency band is between 5925MHz and 7125MHz.

In some embodiments, the length of the first radiating portion is approximately equal to 0.25 times the wavelength of the first frequency band.

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

In some embodiments, the length of the third radiating portion is substantially equal to 0.25 times the wavelength of the third frequency band.

In order to make the purpose, features and advantages of the present invention more comprehensible, specific embodiments of the present invention are listed below, with the accompanying drawings, and detailed descriptions are as follows.

Certain vocabulary is used to refer to specific elements in the specification and the scope of the patent application. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. This specification and the scope of the patent application do not use differences in names as a way to distinguish elements, but use differences in functions of elements as a criterion for distinguishing. The terms "including" and "including" mentioned in the entire specification and the scope of the patent application are open-ended terms and should be interpreted as "including but not limited to". The term "approximately" 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 term "coupling" includes any direct and indirect electrical connection means in this specification. Therefore, if it is described in the text that a first device is coupled to a second device, it means that the first device can be directly electrically connected to the second device, or indirectly electrically connected to the second device through other devices or connection means. Two devices.

FIG. 1 is a schematic diagram of 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 Figure 1, the mobile device 100 includes a ground element 110, a first radiation element 120, a second radiation part 130, a third radiation part 140, and a fourth radiation element. Portion 150, and a dielectric substrate 170, wherein the ground element 110, the first radiating portion 120, the second radiating portion 130, the third radiating portion 140, and the fourth radiating portion 150 can all be made of metal materials, for example : Copper, silver, aluminum, iron, or their alloys. It must be understood that although not shown in Figure 1, the mobile device 100 may further include other components, such as a processor, a touch panel, a speaker, a battery module, and a housing.

The ground element 110 can be used to provide a ground potential. For example, the grounding element 110 may be implemented by a ground copper foil (Ground Copper Foil), and it may be coupled to a system ground plane (not shown) of the mobile device 100.

The first radiating portion 120 may substantially exhibit a meandering shape, such as an inverted U-shape or an inverted J-shape. In detail, the first radiating portion 120 has a first end 121 and a second end 122, wherein the first end 121 of the first radiating portion 120 is coupled to the ground element 110, and the second radiating portion 120 is The end 122 is an open end (Open End).

The second radiating part 130 may substantially exhibit a loop shape with a notch 135. In detail, the second radiating part 130 has a first end 131 and a second end 132, and a feeding point FP is located at the first end 131 of the second radiating part 130, and the second radiating part 130 The second end 132 of the portion 130 is coupled to the ground element 110. The feeding point FP can be further coupled to a signal source (Signal Source) 190. For example, the signal source 190 may be a radio frequency (RF) module. The first end 131 and the second end 132 of the second radiating portion 130 are adjacent to each other, and the notch 135 is between the two ends. It should be noted that the term "adjacent" or "adjacent" in this specification can mean that the distance between the corresponding two elements is less than a predetermined distance (for example: 5mm or less), but it usually does not include the direct contact between the two corresponding elements. (That is, the aforementioned spacing is shortened to 0).

The third radiating portion 140 may substantially exhibit a shorter straight bar shape, which may be at least partially perpendicular to the second radiating portion 130. In detail, the third radiating portion 140 has a first end 141 and a second end 142, wherein the first end 141 of the third radiating portion 140 is coupled to a first connection point on the second radiating portion 130 ( Connection Point) CP1, and the second end 142 of the third radiating portion 140 is an open end. The first connection point CP1 may be adjacent to the feed point FP. In addition, the second end 122 of the first radiating portion 120 is adjacent to the second radiating portion 130 and the third radiating portion 140 at the same time, wherein a first coupling gap can be formed between the first radiating portion 120 and the second radiating portion 130 ( Coupling Gap) GC1, and a second coupling gap GC2 can be formed between the first radiating portion 120 and the third radiating portion 140.

The fourth radiating portion 150 may substantially exhibit a long straight strip shape, which may be at least partially parallel to the second radiating portion 130. In detail, the fourth radiating portion 150 has a first end 151 and a second end 152, wherein the first end 151 of the fourth radiating portion 150 is coupled to a second connection point CP2 on the second radiating portion 130 , And the second end 152 of the fourth radiating portion 150 and the second end 142 of the third radiating portion 140 may extend substantially in opposite directions and away from each other. The second connection point CP2 may be opposite to the first connection point CP1 and adjacent to the feed point FP. The second end 152 of the fourth radiating portion 150 is further coupled to a third connection point CP3 on the second radiating portion 130, so that the second radiating portion 130 and the fourth radiating portion 150 jointly surround a non-metallic enclosed area (Non -metal Closed Region) 160. For example, the non-metallic enclosed area 160 may be substantially rectangular or square, but it is not limited to this. On the other hand, compared to the first end 131 of the second radiating portion 130, the third connection point CP3 is closer to the second end 132 of the second radiating portion 130.

The dielectric substrate 170 may be an FR4 (Flame Retardant 4) substrate, a printed circuit board (PCB), or a flexible circuit board (FCB). The ground element 110, the first radiating part 120, the second radiating part 130, the third radiating part 140, and the fourth radiating part 150 can all be disposed on the same surface of the dielectric substrate 170. In a preferred embodiment, the ground element 110, the first radiating portion 120, the second radiating portion 130, the third radiating portion 140, the fourth radiating portion 150, and the dielectric substrate 170 together form a planar antenna structure (Antenna Structure ).

Figure 2 is a diagram showing the return loss (Return Loss) of the antenna structure of the mobile device 100 according to an embodiment of the present invention, where the horizontal axis represents the operating frequency (MHz) and the vertical axis represents the return loss (dB). According to the measurement result in Figure 2, when excited by the signal source 190, the antenna structure 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 may be between 2400 MHz and 2500 MHz, the second frequency band FB2 may be between 5150 MHz and 5850 MHz, and the third frequency band FB3 may be between 5925 MHz and 7125 MHz. Therefore, the antenna structure of the mobile device 100 will at least support the wideband operation of the traditional WLAN (Wireless Wide Area Network) 2.4GHz/5GHz and the new generation Wi-Fi 6e.

In terms of antenna principle, the first radiating part 120 can be coupled and excited by the second radiating part 130 to generate the aforementioned first frequency band FB1. The second radiating part 130 can independently excite the aforementioned second frequency band FB2. The third radiating part 140 can also independently excite the aforementioned third frequency band FB3. In addition, according to the actual measurement results, the design of the fourth radiating part 150 and the non-metal enclosed area 160 is helpful for fine-tuning the impedance matching of the second frequency band FB2 and the third frequency band FB3, and the second frequency band FB2 can be increased at the same time. And the radiation efficiency of the third band FB3 (Radiation Efficiency).

Fig. 3 shows the radiation efficiency diagram of the antenna structure of the mobile device 100 according to an embodiment of the present invention, where the horizontal axis represents the operating frequency (MHz), and the vertical axis represents the radiation efficiency (dB). According to the measurement results in Fig. 3, the radiation efficiency of the antenna structure of the mobile device 100 in the first frequency band FB1, the second frequency band FB2, and the third frequency band FB3 can reach -5dB or higher, which can meet the traditional requirements. The practical application requirements of WLAN and new generation Wi-Fi 6e communication.

In some embodiments, the component sizes of the mobile device 100 can be as follows. The length L1 of the first radiating portion 120 (that is, the length L1 from the first end 121 to the second end 122) may be approximately equal to 0.25 times the wavelength (λ/4) of the first frequency band FB1 of the antenna structure of the mobile device 100. The length L2 of the second radiating portion 130 (that is, the length L2 from the first end 131 to the second end 132) may be approximately equal to 0.5 times the wavelength (λ/2) of the second frequency band FB2 of the antenna structure of the mobile device 100. The length L3 of the third radiating portion 140 (that is, the length L3 from the first end 141 to the second end 142) may be approximately equal to 0.25 times the wavelength (λ/4) of the third frequency band FB3 of the antenna structure of the mobile device 100. The width of the notch 135 of the second radiating portion 130 (that is, the distance between the first end 131 and the second end 132) may be between 0.5 mm and 1 mm. The width of the first coupling gap GC1 between the first radiating portion 120 and the second radiating portion 130 may be between 0.5 mm and 1 mm. The width of the second coupling gap GC2 between the first radiating portion 120 and the third radiating portion 140 may be between 0.5 mm and 1 mm. The total height H1 of the antenna structure of the mobile device 100 may be less than or equal to 4 mm. The range of the above element size is based on the results of many experiments, which helps to optimize the operating bandwidth and impedance matching of the antenna structure of the mobile device 100.

FIG. 4 is a schematic diagram of a mobile device 400 according to another embodiment of the present invention. Figure 4 is similar to Figure 1. In the embodiment of FIG. 4, an antenna structure of the mobile device 400 further includes a fifth radiating portion 480, which may be made of a metal material and disposed on the dielectric substrate 170. The fifth radiating portion 480 may substantially exhibit a shorter straight bar shape. In detail, the fifth radiating portion 480 has a first end 481 and a second end 482, wherein the first end 481 of the fifth radiating portion 480 is coupled to a fourth connection point CP4 on the first radiating portion 120 , And the second end 482 of the fifth radiating portion 480 is an open end. The second end 142 of the third radiating portion 140 and the second end 482 of the fifth radiating portion 480 may extend substantially in opposite directions and close to each other. The length L4 of the fifth radiating portion 480 (that is, the length L4 from the first end 481 to the second end 482) may be substantially equal to the length L3 of the third radiating portion 140. According to actual measurement results, the addition of the fifth radiating part 480 can increase the operating bandwidth of the antenna structure of the mobile device 400 in the aforementioned second frequency band FB2 and third frequency band FB3. The remaining features of the mobile device 400 in FIG. 4 are similar to those of the mobile device 100 in FIG. 1. Therefore, the two embodiments can achieve similar operating effects.

FIG. 5 is a schematic diagram of a notebook computer 500 according to an embodiment of the invention. In the embodiment of FIG. 5, the aforementioned antenna structure can be applied to a notebook computer 500, where the notebook computer 500 includes an upper cover shell 510, a display frame 520, a keyboard frame 530, and a base shell 540. It must be understood that the upper cover shell 510, the display frame 520, the keyboard frame 530, and the base shell 540 are respectively equivalent to the "A part", "B part", "C part" and "D part" commonly known in the field of notebook computers. Pieces". The aforementioned antenna structure can be arranged at a first position 551 or (and) a second position 552 of the notebook computer 500, and can be covered by a non-conductor display frame 520. According to actual measurement results, since the total antenna height of the present invention is extremely small (it can be reduced by about 50% compared to the traditional antenna height of about 8mm), the proposed design can be applied to various narrow border mobile devices. At the same time maintain good communication quality and operating bandwidth.

The present invention proposes a novel mobile device and antenna structure. Compared with the traditional design, the present invention at least has the advantages of small size, wide frequency band, low manufacturing cost, and beautification of the appearance of mobile devices, so it is very suitable for various types of applications. Among mobile communication devices.

It should be noted that the above-mentioned component size, component shape, and frequency range are not the limiting conditions 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 shown in FIGS. 1-5. The present invention may only include any one or more of the features of any one or more of the embodiments in FIGS. 1-5. In other words, not all the features of the figures need to be implemented in the mobile device and the antenna structure of the present invention at the same time.

The ordinal numbers in this specification and the scope of the patent application, such as "first", "second", "third", etc., do not have a sequential relationship between each other, and they are only used to distinguish two having the same Different components of the name.

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

100,400: mobile devices 110: Grounding element 120: First Radiation Department 121: The first end of the first radiating part 122: The second end of the first radiating part 130: The second radiation department 131: The first end of the second radiating part 132: The second end of the second radiating part 135: The Gap of the Second Radiation Department 140: Third Radiation Department 141: The first end of the third radiating part 142: The second end of the third radiating part 150: Fourth Radiation Department 151: The first end of the fourth radiating part 152: The second end of the fourth radiating part 160: Non-metallic enclosed area 170: Dielectric substrate 190: signal source 480: Fifth Radiation Department 481: The first end of the fifth radiating part 482: The second end of the fifth radiating part 500: laptop 510: Upper cover shell 520: display frame 530: keyboard frame 540: Base shell 551: first position 552: second position CP1: the first connection point CP2: second connection point CP3: third connection point CP4: Fourth connection point FB1: First frequency band FB2: Second frequency band FB3: Third frequency band FP: feed point GC1: first coupling gap GC2: second coupling gap H1: total height L1, L2, L3, L4: length

Figure 1 is a schematic diagram of a mobile device according to an embodiment of the invention. FIG. 2 is a diagram showing the return loss of the antenna structure of the mobile device according to an embodiment of the present invention. FIG. 3 is a diagram showing the radiation efficiency of the antenna structure of the mobile device according to an embodiment of the invention. Fig. 4 is a schematic diagram of a mobile device according to another embodiment of the present invention. FIG. 5 is a schematic diagram of a notebook computer according to an embodiment of the invention.

100: mobile device

110: Grounding element

120: First Radiation Department

121: The first end of the first radiating part

122: The second end of the first radiating part

130: The second radiation department

131: The first end of the second radiating part

132: The second end of the second radiating part

135: The Gap of the Second Radiation Department

140: Third Radiation Department

141: The first end of the third radiating part

142: The second end of the third radiating part

150: Fourth Radiation Department

151: The first end of the fourth radiating part

152: The second end of the fourth radiating part

160: Non-metallic enclosed area

170: Dielectric substrate

190: signal source

CP1: the first connection point

CP2: second connection point

CP3: third connection point

FP: feed point

GC1: first coupling gap

GC2: second coupling gap

H1: total height

L1, L2, L3: length

Claims (9)

A mobile device includes: a ground element; a first radiating part coupled to the ground element; a second radiating part having a feeding point and coupled to the ground element; a third radiating part coupled to the ground element Connected to the second radiating portion, wherein the first radiating portion is adjacent to the second radiating portion and the third radiating portion; a fourth radiating portion is coupled to the second radiating portion, wherein the second radiating portion And the fourth radiating portion surround a non-metallic enclosed area; and a dielectric substrate, wherein the grounding element, the first radiating portion, the second radiating portion, the third radiating portion, and the fourth radiating portion are all provided On the dielectric substrate; wherein the ground element, the first radiating portion, the second radiating portion, the third radiating portion, the fourth radiating portion, and the dielectric substrate together form an antenna structure; wherein the antenna structure The total height is less than or equal to 4mm. The mobile device according to claim 1, wherein the first radiating portion presents a serpentine shape. The mobile device according to claim 1, wherein the non-metallic enclosed area presents a rectangle. The mobile device according to claim 1, wherein the third radiating portion and the fourth radiating portion each present a straight strip shape, and extend substantially in opposite directions. The mobile device as described in claim 1, further including: A fifth radiating part is coupled to the first radiating part, wherein the third radiating part and the fifth radiating part generally extend in a direction approaching each other. The mobile device according to 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 2400MHz and 2500MHz, and the second frequency band is between Between 5150MHz and 5850MHz, and the third frequency band is between 5925MHz and 7125MHz. The mobile device according to claim 6, wherein the length of the first radiating portion is substantially equal to 0.25 times the wavelength of the first frequency band. The mobile device according to claim 6, wherein the length of the second radiating portion is approximately equal to 0.5 times the wavelength of the second frequency band. The mobile device according to claim 6, wherein the length of the third radiating portion is substantially equal to 0.25 times the wavelength of the third frequency band.

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