CN112397888B - mobile device - Google Patents

Abstract

A mobile device, comprising: a common grounding part, a connecting part, a first radiation part, a second radiation part, a third radiation part, a fourth radiation part and a medium substrate. The common ground is coupled to a ground potential. The first radiation part is provided with a first feed-in point, wherein the first radiation part is coupled to the common grounding part through the connecting part. The second radiation part is coupled to the first feed point, wherein the second radiation part is at least partially surrounded by the first radiation part. The third radiation part is provided with a second feed-in point. The fourth radiating portion is adjacent to the third radiating portion, wherein the fourth radiating portion is coupled to the common ground portion. The common grounding part, the connecting part, the first radiation part, the second radiation part, the third radiation part and the fourth radiation part form an antenna structure arranged on the medium substrate together.

Description

mobile device

technical field

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

Background technique

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

Antenna is an indispensable element in the field of wireless communication. If the bandwidth of the antenna used for receiving or transmitting signals is insufficient, the communication quality of the mobile device will easily be degraded. Therefore, how to design a small-sized, wide-band antenna element is an important issue for antenna designers.

Contents of the invention

In a preferred embodiment, the present invention provides a mobile device, comprising: a common ground portion coupled to a ground potential; a connection portion; a first radiation portion having a first feeding point, wherein the first A radiating part is coupled to the common ground part via the connecting part; a second radiating part is coupled to the first feeding point, wherein the second radiating part is at least partially surrounded by the first radiating part; a third a radiating part having a second feeding point; a fourth radiating part adjacent to the third radiating part, wherein the fourth radiating part is coupled to the common ground part; and a dielectric substrate; wherein the common ground part, The connecting portion, the first radiating portion, the second radiating portion, the third radiating portion, and the fourth radiating portion jointly form an antenna structure; wherein the antenna structure is disposed on the dielectric substrate.

In some embodiments, the common ground portion is in the shape of a straight bar.

In some embodiments, the common ground portion has an opposite first side and a second side, and the connecting portion, the first radiating portion, and the second radiating portion are all disposed on the first side of the common ground portion. side, and the third radiating portion and the fourth radiating portion are both disposed at the second side of the common ground portion.

In some embodiments, the first radiating portion presents an inverted U shape and defines a notch area, and the second radiating portion is located inside the notch area.

In some embodiments, the fourth radiating portion is separated from the third radiating portion, and a coupling gap is formed between the third radiating portion and the fourth radiating portion.

In some embodiments, the antenna structure covers a first frequency band, a second frequency band, a third frequency band, and a fourth frequency band, the first frequency band is between 1710 MHz and 2170 MHz, and the second frequency band is between 2300 MHz The third frequency band is between 2400MHz and 2500MHz, and the fourth frequency band is between 5150MHz and 5850MHz.

In some embodiments, the first frequency band is excited by the first radiating part, and the length of the first radiating part is roughly equal to 0.25 times the wavelength of the first frequency band.

In some embodiments, the second frequency band is excited by the second radiating part, and the length of the second radiating part is roughly equal to 0.25 times the wavelength of the second frequency band.

In some embodiments, the third frequency band is excited by the fourth radiating part and the common ground part, and the total length of the fourth radiating part and the common ground part is approximately equal to 0.25 times the wavelength of the third frequency band.

In some embodiments, the fourth frequency band is excited by the third radiating part, and the length of the third radiating part is roughly equal to 0.25 times the wavelength of the fourth frequency band.

Description of drawings

FIG. 1 shows a top view of a mobile device according to an embodiment of the invention.

FIG. 2 shows a return loss diagram of the antenna structure of the mobile device according to an embodiment of the invention.

FIG. 3 shows a return loss diagram of the antenna structure of the mobile device according to an embodiment of the invention.

FIG. 4 shows a radiation efficiency diagram of an antenna structure of a mobile device according to an embodiment of the invention.

FIG. 5 shows a radiation efficiency diagram of the antenna structure of the mobile device according to an embodiment of the invention.

FIG. 6 shows an isolation diagram of an antenna structure of a mobile device according to an embodiment of the invention.

FIG. 7 shows a perspective view of a mobile device according to another embodiment of the invention.

Explanation of reference signs:

100, 700～mobile device;

110～common grounding part;

111～the first end of the common grounding part;

112～the second end of the common grounding part;

115～the first side of the common grounding part;

116～the second side of the common grounding part;

120～connection part;

130～the first radiation department;

131～the first end of the first radiation part;

132～the second end of the first radiation part;

135～notch area;

136 ~ the bending part of the first radiation part;

140～Second Radiation Department;

141～the first end of the second radiation part;

142～the second end of the second radiation part;

150 ~ the third radiation department;

151～the first end of the third radiation part;

152～the second end of the third radiation part;

160 ~ the fourth radiation department;

161～the first end of the fourth radiation part;

162～the second end of the fourth radiation part;

170～dielectric substrate;

191～the first signal source;

192～second signal source;

710～top cover;

720～base;

720～the edge of the base;

730～rotating shaft element;

751 ~ the first position;

752 ~ second position;

D1～spacing;

FB1 ~ the first frequency band;

FB2 ~ the second frequency band;

FB3 ~ the third frequency band;

FB4 ~ the fourth frequency band;

FP1 ~ the first feed point;

FP2～the second feed point;

GC1～coupling gap;

LT～total length;

VSS ~ ground potential;

WT ~ total width.

Detailed ways

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

Certain terms are used in the specification and claims to refer to particular elements. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. The specification and claims do not use the difference in name as a way to distinguish components, but use the difference in function of components as a criterion for distinguishing. The terms "comprising" and "comprising" mentioned throughout the specification and claims are open-ended terms, so they 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 "coupled" in this specification includes any direct and indirect electrical connection means. Therefore, if it is described 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 shows a top view of a mobile device 100 according to an embodiment of the invention. For example, the mobile device 100 can be a smart phone (Smart Phone), a tablet computer (Tablet Computer), or a notebook computer (Notebook Computer). As shown in FIG. 1 , the mobile device 100 at least includes: a common ground portion (Common GroundElement) 110, a connection portion (Connection Element) 120, a first radiation portion (Radiation Element) 130, a second radiation portion 140, a The third radiating portion 150, a fourth radiating portion 160, and a dielectric substrate (Dielectric Substrate) 170, wherein the common ground portion 110, the connecting portion 120, the first radiating portion 130, the second radiating portion 140, and the third radiating portion 150, Both the fourth radiating portion 160 can be made of metal material, such as copper, silver, aluminum, iron, or alloys thereof. The dielectric substrate 170 may be an FR4 (Flame Retardant 4) substrate, a Printed Circuit Board (PCB), or a Flexible Circuit Board (FCB). It must be understood that although not shown in FIG. 1, the mobile device 100 may also include other components, such as: a display device, a speaker, a touch control module, a power supply A module (Power Supply Module), and a housing (Housing).

The common ground portion 110 may be roughly in the shape of a straight bar. The common ground portion 110 has a first end 111 and a second end 112 , wherein the first end 111 of the common ground portion 110 is coupled to a ground voltage VSS. For example, the ground potential VSS can be provided by a system ground plane (not shown) of the mobile device 100 . Specifically, the common ground portion 110 has a first side 115 and a second side 116 opposite to each other, wherein the connection portion 120 , the first radiation portion 130 , and the second radiation portion 140 are all disposed on the first side of the common ground portion 110 . One side 115 (for example: the left side), and the third radiating portion 150 and the fourth radiating portion 160 are both disposed at the second side 116 (for example: the right side) of the common ground portion 110 . It should be noted that both the first radiating part 130 and the fourth radiating part 160 are coupled to the ground potential VSS via the common ground part 110 .

The connecting portion 120 may roughly present a rectangle or a square. The first radiating portion 130 may roughly present an inverted U-shape and define a notch area 135 , the notch area 135 may roughly present a rectangle, wherein the second radiating portion 140 may be completely located inside the notch area 135 of the first radiating portion 130 . The first radiation part 130 has a first feeding point (Feeding Point) FP1 , and the first feeding point FP1 is further coupled to a first signal source (Signal Source) 191 . In detail, the first radiating part 130 has a first end 131 and a second end 132, wherein the first feeding point FP1 is located at the first end 131 of the first radiating part 130, and the second end of the first radiating part 130 The two ends 132 are an open end. In addition, a bent portion 136 of the first radiation portion 130 can be coupled to the second end 112 of the common ground portion 110 via the connecting portion 120 .

The second radiating portion 140 may roughly present a C-shape, wherein the second radiating portion 140 is at least partially surrounded by the first radiating portion 130 . In detail, the second radiating part 140 has a first end 141 and a second end 142, wherein the first end 141 of the second radiating part 140 is coupled to the first feeding point FP1 and the second end of the first radiating part 130. One end 131 , and the second end 142 of the second radiation portion 140 is an open end. In addition, the second end 142 of the second radiating portion 140 is adjacent to the bent portion 136 of the first radiating portion 130 . It must be noted that the so-called "adjacent" or "adjacent" in this specification may mean that the distance between the corresponding two elements is less than a predetermined distance (for example: 5mm or less), but usually does not include that the corresponding two elements are in direct contact with each other. case (that is, the aforementioned spacing is shortened to 0).

The third radiating portion 150 may be substantially straight, and may be approximately perpendicular to the common ground portion 110 . The third radiating part 150 has a second feeding point FP2 , and the second feeding point FP2 is further coupled to a second signal source 192 . In detail, the third radiating part 150 has a first end 151 and a second end 152, wherein the second feeding point FP2 is located at the first end 151 of the third radiating part 150, and the third radiating part 150 has a second end 152. The two ends 152 are open ends and extend away from the common ground portion 110 .

The fourth radiating portion 160 may roughly present an inverted C shape, which may be at least partially perpendicular to the common ground portion 110 and at least partially parallel to the third radiating portion 150 . The fourth radiation portion 160 is adjacent to the third radiation portion 150 but separated from the third radiation portion 150 , wherein a coupling gap (Coupling Gap) GC1 is formed between the third radiation portion 150 and the fourth radiation portion 160 . In detail, the fourth radiating part 160 has a first end 161 and a second end 162, wherein the first end 161 of the fourth radiating part 160 is coupled to the second end 112 of the common ground part 110, and the fourth radiating part 160 The second end 162 of the portion 160 is an open end and extends towards the direction close to the common ground portion 110 .

In some embodiments, the common ground portion 110, the connecting portion 120, the first radiating portion 130, the second radiating portion 140, the third radiating portion 150, and the fourth radiating portion 160 together form an antenna structure (Antenna Structure), and The antenna structure is planar and disposed on a surface of the dielectric substrate 170 .

FIG. 2 shows a graph of return loss (ReturnLoss) of the antenna structure 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. 2, when excited by the first signal source 191, the antenna structure of the mobile device 100 can cover a first frequency band (Frequency Band) FB1 and a second frequency band FB2, wherein the first frequency band FB1 can be between 1710MHz to 2170MHz, and the second frequency band FB2 can be between 2300MHz to 2700MHz. Therefore, the antenna structure of the mobile device 100 can at least support dual-band operation of MIMO (Multi-Input and Multi-Output) of WWAN (Wireless Wide Area Network).

FIG. 3 shows a return loss graph of the antenna structure 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, when excited by the second signal source 192, the antenna structure of the mobile device 100 can cover a third frequency band FB3 and a fourth frequency band FB4, wherein the third frequency band FB3 can be between 2400MHz and 2500MHz , and the fourth frequency band FB4 may be between 5150MHz and 5850MHz. Therefore, the antenna structure of the mobile device 100 can at least support WLAN (Wireless Local Area Networks) 2.4GHz/5GHz dual-band operation.

In some embodiments, the operating principle of the antenna structure of the mobile device 100 may be as follows. The first frequency band FB1 can be excited and generated by the first radiation part 130 . The second frequency band FB2 can be excited and generated by the second radiation part 140 . The third frequency band FB3 can be excited and generated by the fourth radiation part 160 and the common ground part 110 . The fourth frequency band FB4 can be excited and generated by the third radiation part 150 . According to actual measurement results, the common ground 110 can not only be used as a grounding resonant path (Grounding Resonant Path) for the third frequency band FB3, but also be used for fine-tuning the impedance matching (Impedance Matching) of the first frequency band FB1 and the second frequency band FB2. Therefore, adding the common ground portion 110 helps to reduce the overall size of the antenna structure of the mobile device 100 .

FIG. 4 shows a graph of radiation efficiency (Radiation Efficiency) of the antenna structure 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 radiation efficiency (dB). According to the measurement results in FIG. 4 , the radiation efficiency of the antenna structure of the mobile device 100 in the first frequency band FB1 and the second frequency band FB2 can reach about -4dB, which can meet the actual application requirements of general WWAN communication.

FIG. 5 shows a radiation efficiency diagram of the antenna structure of the 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 radiation efficiency (dB). According to the measurement results in FIG. 5 , the radiation efficiency of the antenna structure of the mobile device 100 in the third frequency band FB3 and the fourth frequency band FB4 can reach about -3.5dB, which can meet the actual application requirements of general WLAN communication.

FIG. 6 shows an isolation (Isolation) diagram of the antenna structure 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 isolation (dB). According to FIG. 6 The measurement results show that when fed by the first signal source 191 and the second signal source 192 at the same time, the antenna structure of the mobile device 100 is in the aforementioned first frequency band FB1, second frequency band FB2, third frequency band FB3, and fourth frequency band FB4 The isolation in each can reach at least 8dB, which means that the first signal source 191 and the second signal source 192 are less likely to interfere with each other, so the overall radiation performance of the antenna structure of the mobile device 100 can be improved.

In some embodiments, the dimensions of the components of the mobile device 100 are as follows. The length of the first radiation portion 130 (ie, the length from the first end 131 to the second end 132 ) is 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 of the second radiation portion 140 (ie, the length from the first end 141 to the second end 142 ) is approximately equal to 0.25 times the wavelength (λ/4) of the second frequency band FB2 of the antenna structure of the mobile device 100 . The length of the third radiation portion 150 (ie, 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 fourth frequency band FB4 of the antenna structure of the mobile device 100 . The total length of the fourth radiating portion 160 and the common ground portion 110 (that is, the total length from the first end 111, via the second end 112 and the first end 161, to the second end 162) is approximately equal to that of the mobile device 100 0.25 times the wavelength (λ/4) of the third frequency band FB3 of the antenna structure. The distance D1 between the first radiating portion 130 and the common ground portion 110 (or the length of the connecting portion 120 ) may be between 2 mm and 3 mm. The width of the coupling gap GC1 (or the distance between the third radiating portion 150 and the fourth radiating portion 160 ) may be less than or equal to 2mm. The total length LT of the antenna structure of the mobile device 100 may be less than or equal to 30 mm. The total width WT of the antenna structure of the mobile device 100 may be less than or equal to 8mm. The above component size ranges are determined based on the results of multiple experiments, which helps to optimize the operation bandwidth (Operation Bandwidth) and impedance matching of the antenna structure of the mobile device 100 .

FIG. 7 shows a perspective view of a mobile device 700 according to another embodiment of the present invention. In the embodiment of FIG. 7 , the mobile device 700 is a notebook computer and includes an upper cover (Upper Cover) 710, a base (Base) 720, and a hinge element (Hinge Element) 730, wherein the hinge element 730 is connected to Between the cover 710 and the base 720, the notebook computer can be operated in an open mode or a closed mode. In detail, the base 720 has an edge 721 , and the aforementioned antenna structure can be disposed in the base 720 at a first position 751 or a second position 752 adjacent to the edge 721 . If the mobile device 700 has a metal shell, the upper cover 710 and the base 720 can also have corresponding antenna windows (Antenna Window), so as to facilitate the transmission of the electromagnetic wave (Electromagnetic Wave) of the aforementioned antenna structure. The rest of the features of the mobile device 700 in FIG. 7 are similar to the mobile device 100 in FIG. 1 , so both embodiments can achieve similar operational effects.

The present invention proposes a novel mobile device and antenna structure, which can simultaneously cover the operating frequency bands of WWAN and WLAN. By adding the design of the common ground, the total area of the broadband antenna structure proposed by the present invention can be significantly reduced by more than 50% compared with the prior art (the total length of the traditional integrated antenna covering WWAN and WLAN is usually at least 65mm or longer) . All in all, the present invention has at least the advantages of small size, wide frequency band, and low manufacturing cost, so it is very suitable for application in various narrow border mobile communication devices.

It should be noted that the above-mentioned component sizes, component shapes, and frequency ranges are not limitations of the present invention. Antenna designers can adjust these settings according to different needs. The mobile device and the antenna structure of the present invention are not limited to the states shown in FIGS. 1-7 . The present invention may only include any one or more features of any one or more of the embodiments in FIGS. 1-7 . In other words, not all the illustrated features must be implemented in the mobile device and the antenna structure of the present invention at the same time.

The ordinal numbers in this description and the scope of the patent application, such as "first", "second", "third" and so on, have no sequential relationship with each other, and are only used to mark and distinguish between two different elements of the name.

Although the present invention is disclosed above through preferred embodiments, the above disclosure is not intended to limit the scope of the present invention. Any person skilled in the art may make certain changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be defined by the scope of the appended claims.

Claims (9)

1. A mobile device, comprising:

a common ground coupled to a ground potential;

a connecting portion;

a first radiation part having a first feed point, wherein the first radiation part is coupled to the common ground part via the connection part;

a second radiation part coupled to the first feed point, wherein the second radiation part is at least partially surrounded by the first radiation part;

a third radiation part with a second feed point;

a fourth radiating portion adjacent to the third radiating portion, wherein the fourth radiating portion is coupled to the common ground portion; and

a dielectric substrate;

wherein the common grounding part, the connecting part, the first radiation part, the second radiation part, the third radiation part and the fourth radiation part form an antenna structure together;

wherein the antenna structure is arranged on the dielectric substrate;

the first radiation part is in an inverted U shape and defines a gap area, and the second radiation part is positioned in the gap area.

2. The mobile device as claimed in claim 1, wherein the common ground portion has a straight bar shape.

3. The mobile device of claim 1, wherein the common ground has a first side and a second side opposite, the connecting portion, the first radiating portion, and the second radiating portion are disposed at the first side of the common ground, and the third radiating portion and the fourth radiating portion are disposed at the second side of the common ground.

4. The mobile device as claimed in claim 1, wherein the fourth radiating portion is separated from the third radiating portion, and a coupling gap is formed between the third radiating portion and the fourth radiating portion.

5. The mobile device of claim 1, wherein the antenna structure covers a first frequency band between 1710MHz and 2170MHz, a second frequency band between 2300MHz and 2700MHz, a third frequency band between 2400MHz and 2500MHz, and a fourth frequency band between 5150MHz and 5850 MHz.

6. The mobile device as claimed in claim 5, wherein the first frequency band is generated by the first radiating portion, and the length of the first radiating portion is substantially equal to 0.25 times the wavelength of the first frequency band.

7. The mobile device as claimed in claim 5, wherein the second frequency band is generated by the excitation of the second radiating portion, and the length of the second radiating portion is substantially equal to 0.25 times the wavelength of the second frequency band.

8. The mobile device as claimed in claim 5, wherein the third frequency band is generated by excitation of the fourth radiation portion and the common ground portion, and a total length of the fourth radiation portion and the common ground portion is substantially equal to 0.25 times a wavelength of the third frequency band.

9. The mobile device as claimed in claim 5, wherein the fourth frequency band is generated by the excitation of the third radiation portion, and the length of the third radiation portion is substantially equal to 0.25 times the wavelength of the fourth frequency band.

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