CN110931938B

CN110931938B - Electronic device

Info

Publication number: CN110931938B
Application number: CN201811099877.5A
Authority: CN
Inventors: 张琨盛; 林敬基
Original assignee: Acer Inc
Current assignee: Acer Inc
Priority date: 2018-09-20
Filing date: 2018-09-20
Publication date: 2021-04-16
Anticipated expiration: 2038-09-20
Also published as: CN110931938A

Abstract

An electronic device, comprising: the radiation device comprises a dielectric substrate, a first radiation part, a second radiation part, a third radiation part and a sensing plate. The first radiation part comprises a first branch, a second branch and a first connecting part. The first connecting part is coupled between the first branch and the second branch. The second branch is coupled to ground potential. The second radiation part is provided with a feed-in point. A first coupling gap is formed between the second radiating part and the first branch. The third radiation part is coupled to the feed point. A second coupling gap is formed between the third radiating part and the first branch. The first radiating portion, the second radiating portion, and the third radiating portion form an antenna structure. The sensing plate includes a third branch, a fourth branch, and a second connection. The second connecting part is coupled between the third branch and the fourth branch. The second connecting portion has a serpentine structure.

Description

Electronic device

Technical Field

The present invention relates to an electronic device, and more particularly, to an electronic device capable of combining an Antenna Structure (Antenna Structure) and a Sensing board (Sensing Pad).

Background

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

An Antenna Element (Antenna Element) is an essential component of a mobile device having a wireless communication function. In order to comply with government regulations for Specific Absorption Rate (SAR), designers typically incorporate a Proximity Sensor (P-Sensor) in the mobile device to control Radio Frequency (RF) power with respect to the antenna elements. However, the Sensing plate (Sensing Pad) of the proximity sensor is liable to interfere with the antenna element, and even cause the antenna element to generate an unnecessary resonance Mode (resonance Mode). Therefore, there is a need to provide a new solution to overcome the problems of the prior art.

Disclosure of Invention

In a preferred embodiment, the present invention provides an electronic device comprising: the dielectric substrate is provided with a first surface and a second surface which are opposite; a first radiation part including a first branch, a second branch and a first connection part, wherein the first connection part is coupled between the first branch and the second branch, and the second branch is coupled to a ground potential; a second radiation part with a feed-in point, wherein a first coupling gap is formed between the second radiation part and the first branch; a third radiation part coupled to the feed point, wherein a second coupling gap is formed between the third radiation part and the first branch, and the second radiation part and the third radiation part are at least partially surrounded by the first radiation part; and a sensing plate coupled to a proximity sensor and including a third branch, a fourth branch, and a second connection portion, wherein the second connection portion is coupled between the third branch and the fourth branch, and the second connection portion has a serpentine structure; the first radiation part, the second radiation part and the third radiation part are all arranged on the first surface of the medium substrate, and the sensing plate is arranged on the second surface of the medium substrate; wherein the first radiation part, the second radiation part and the third radiation part form an antenna structure together.

In some embodiments, the width of the first connection is substantially greater than the width of the first branch and the width of the second branch.

In some embodiments, the third radiating portion further includes an inverted U-shaped bent portion, such that one end of the third radiating portion and one end of the second radiating portion extend in substantially the same direction.

In some embodiments, the first branch has a first perpendicular projection on the second surface of the dielectric substrate, the first perpendicular projection completely overlaps with the third branch, the second branch has a second perpendicular projection on the second surface of the dielectric substrate, the second perpendicular projection completely overlaps with the fourth branch, the first connection portion has a third perpendicular projection on the second surface of the dielectric substrate, and the third perpendicular projection at least partially overlaps with the second connection portion.

In some embodiments, the length of the third radiating portion is substantially equal to the length of the first branch or the length of the second branch.

In some embodiments, the width of the first coupling gap is between 0.5mm to 2mm and the width of the second coupling gap is between 0.5mm to 2 mm.

In some embodiments, the antenna structure covers a first frequency band between 704MHz and 960MHz, a second frequency band between 1710MHz and 2170MHz, and a third frequency band between 2300MHz and 2700 MHz.

In some embodiments, the first radiating portion, the second radiating portion, and the third radiating portion are excited to produce the first frequency band and the third frequency band, and the second radiating portion is excited to produce the second frequency band.

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

In some embodiments, the first connecting portion is rectangular, the length of the first connecting portion is at least 8mm, and the width of the first connecting portion is at least 5 mm.

Drawings

Fig. 1A is a top view of an electronic device according to an embodiment of the invention.

Fig. 1B is a back view of an electronic device according to an embodiment of the invention.

Fig. 1C is a side view illustrating an electronic device according to an embodiment of the invention.

Fig. 2 is a top view of an electronic device according to another embodiment of the invention.

Fig. 3 is a return loss diagram showing the antenna structure of the electronic device when the sensing plate does not have the meandering second connecting portion.

Fig. 4 is a return loss diagram illustrating an antenna structure of an electronic device according to an embodiment of the invention.

Fig. 5 is a diagram illustrating antenna efficiency of an antenna structure of an electronic device according to an embodiment of the invention.

Description of reference numerals:

100. 200-an electronic device;

110-a dielectric substrate;

120 to a first radiation section;

130-a first branch;

131-the first end of the first branch;

132 to the second end of the first branch;

140 to a second branch;

141 to the first end of the second branch;

142 to the second end of the second branch;

150 to a first connection;

151 to a first side of the first connection;

152-a second side of the first connection;

160 to a second radiation section;

161 to a first end of the second radiating section;

162 to a second end of the second radiating section;

170 to a third radiation section;

171 to a first end of the third radiating portion;

172 to a second end of the third radiating section;

175 to the inverted U-shaped bent portion of the third radiation portion;

180-an antenna structure;

190-signal source;

220-a sensing plate;

230 to a third branch;

231 to the first end of the third branch;

232 to the second end of the third branch;

240 to a fourth branch;

241 to a first end of a fourth branch;

242 to a second end of the fourth branch;

250 to a second connection portion;

251 to a first end of the second connection portion;

252 to a second end of the second connection;

280-proximity sensor;

CC1 — first curve;

CC 2-second curve;

e1-the first surface of the dielectric substrate;

e2-the second surface of the dielectric substrate;

FP-feed point;

GC1 — first coupling gap;

GC2 — second coupling gap;

h1-thickness of the medium substrate;

lengths of L1, L2, L3, L4, L5, L6, L7, L8;

VSS to ground potential;

w1, W2, W3, W6, W7, W8-width;

WL-meandered line width.

Detailed Description

In order to make the objects, features and advantages of the present invention comprehensible, specific embodiments accompanied with figures are described in detail below.

Certain terms are used throughout the description and following claims to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. The present specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. The term "substantially" means within an acceptable error range, within which a person skilled in the art can solve the technical problem to achieve the basic technical result. In addition, the term "coupled" is used herein to encompass any direct or indirect electrical connection. Thus, if a first device couples to a second device, that connection may be through a direct electrical connection, or through an indirect electrical connection via other devices and connections.

Fig. 1A is a top view of an Electronic Device (Electronic Device)100 according to an embodiment of the invention. Fig. 1B is a back view of the electronic device 100 according to an embodiment of the invention. Fig. 1C is a side view illustrating an electronic device 100 according to an embodiment of the invention. Please refer to fig. 1A, fig. 1B, and fig. 1C. The electronic Device 100 can be applied to a Mobile Device (Mobile Device), for example: a Smart Phone (Smart Phone), a Tablet Computer (Tablet Computer), or a Notebook Computer (Notebook Computer). In the embodiment of fig. 1A, 1B, 1C, the electronic device 100 includes: a Dielectric Substrate (Dielectric Substrate)110, a first Radiation portion (Radiation Element)120, a second Radiation portion 160, a third Radiation portion 170, and a Sensing plate (Sensing Pad) 220. In some embodiments, the first radiation portion 120, the second radiation portion 160, the third radiation portion 170, and the sensing plate 220 are made of metal materials, such as: copper, silver, aluminum, iron, or alloys thereof.

The dielectric substrate 110 may be an FR4 (film resistor 4) substrate, a Printed Circuit Board (PCB), or a Flexible Circuit Board (FCB). The dielectric substrate 110 has a first surface E1 and a second surface E2 opposite to each other, wherein the first radiating part 120, the second radiating part 160, and the third radiating part 170 are disposed on the first surface E1 of the dielectric substrate 110, and the sensing plate 220 is disposed on the second surface E2 of the dielectric substrate 110.

The first radiation portion 120 may substantially have an inverted U-shape. In detail, the first radiating portion 120 includes a first Branch (Branch)130, a second Branch 140, and a first Connection Element (Connection Element)150, wherein the first Connection Element 150 is coupled between the first Branch 130 and the second Branch 140, and the second Branch 140 is coupled to a ground potential VSS (e.g., 0V). The Ground potential VSS may be provided by a Ground Copper Foil (not shown) of a mobile device. The first branch 130 may be substantially in the shape of a straight bar. The first branch 130 has a first End 131 and a second End 132, wherein the first End 131 of the first branch 130 is coupled to a first side 151 of the first connection portion 150, and the second End 132 of the first branch 130 is an Open End (Open End). The second leg 140 may be substantially in the shape of a straight bar. The second branch 140 has a first end 141 and a second end 142, wherein the first end 141 of the second branch 140 is coupled to a second side 152 of the first connection portion 150, and the second end 142 of the second branch 140 is an open end. The first connecting portion 150 may have a substantially rectangular shape, wherein the width W3 of the first connecting portion 150 is substantially greater than the width W1 of the first branch 130 and the width W2 of the second branch 140. The first branch 130 and the second branch 140 may be substantially parallel to each other, wherein the first branch 130 and the second branch 140 may both be substantially perpendicular to the first connection 150.

The second radiation portion 160 may substantially have an inverted L-shape. In detail, the second radiation portion 160 has a first end 161 and a second end 162, wherein a Feeding Point (FP) is located at the first end 161 of the second radiation portion 160, and the second end 162 of the second radiation portion 160 is an open end. The feed point FP may be coupled to a Signal Source 190. For example, the signal source 190 may be a Radio Frequency (RF) module, which can be used to generate a transmission signal or a reception signal. A first Coupling Gap (Coupling Gap) GC1 may be formed between the second end 162 of the second radiating part 160 and the first branch 150 of the first radiating part 120.

The third radiating portion 170 may substantially have an inverted J-shape. In detail, the third radiation portion 170 has a first end 171 and a second end 172, wherein the first end 171 of the third radiation portion 170 is coupled to the feed point FP, and the second end 172 of the third radiation portion 170 is an open end. The second radiation part 160 and the third radiation part 170 are both at least partially surrounded by the first radiation part 120. For example, the second and

third radiation parts

160 and 170 may be interposed between the first and

second branches

130 and 140 of the first radiation part 120. A second coupling gap GC2 may be formed between the second end 172 of the third radiating portion 170 and the first branch 130 of the first radiating portion 120. In some embodiments, the third radiating portion 170 further includes an inverted U-shaped bent portion 175 such that the second end 172 of the third radiating portion 170 and the second end 162 of the second radiating portion 160 extend in substantially the same direction. It should be noted that the first radiation portion 120, the second radiation portion 160, and the third radiation portion 170 together form an Antenna Structure (Antenna Structure)180 of the electronic device 100.

The sensing plate 220 may generally take the shape of an inverted U. In detail, the sensing plate 220 includes a third branch 230, a fourth branch 240, and a second connection portion 250, wherein the second connection portion 250 is coupled between the third branch 230 and the fourth branch 240. The third leg 230 may be substantially in the shape of a straight bar. The third branch 230 has a first end 231 and a second end 232, wherein the first end 231 of the third branch 230 is coupled to a first end 251 of the second connecting portion 250, and the second end 232 of the third branch 230 is an open end. The fourth branch 240 may substantially exhibit a straight bar shape. The fourth branch 240 has a first end 241 and a second end 242, wherein the first end 241 of the fourth branch 240 is coupled to a second end 252 of the second connection portion 250, and the second end 242 of the fourth branch 240 is an open end. The second connection portion 250 may have a substantially serpentine Structure. For example, the second connecting portion 250 may have a W-shape or a connection combination of U-shapes, wherein the number of the U-shapes may be 2, 3, 4, 5, or more, but is not limited thereto. The meandering line width WL of the second connection portion 250 is less than or equal to the width W6 of the third branch 230 and the width W7 of the fourth branch 240.

In some embodiments, the first branch 130 of the first radiation part 120 has a first Vertical Projection (Vertical Projection) on the second surface E2 of the dielectric substrate 110, wherein the first Vertical Projection completely overlaps with the third branch 230 of the sensing plate 220; the second branch 140 of the first radiation part 120 has a second perpendicular projection on the second surface E2 of the dielectric substrate 110, wherein the second perpendicular projection completely overlaps with the fourth branch 240 of the sensing plate 220; the first connecting portion 150 of the first radiating portion 120 has a third vertical projection on the second surface E2 of the dielectric substrate 110, wherein the third vertical projection at least partially overlaps the second connecting portion 250 of the sensing plate 220.

Fig. 2 is a top view of an electronic device 200 according to another embodiment of the invention. Fig. 2 is similar to fig. 1. In the embodiment of fig. 2, the electronic device 200 further includes a Proximity Sensor (P-Sensor) 280, wherein the Proximity Sensor 280 is coupled to the second end 242 of the fourth branch 240 of the sensing plate 220. In other embodiments, the proximity sensor 280 may be coupled to the second end 232 of the third branch 230 of the sensing plate 220 instead. The remaining features of the electronic device 200 of fig. 2 are similar to those of the electronic device 100 of fig. 1, so that similar operations can be achieved in both embodiments.

Fig. 3 is a graph showing the Return Loss (Return Loss) of the antenna structure 180 when the sensing plate 220 does not have the meandering second connection portion 250, wherein the horizontal axis represents the operating frequency (MHz) and the vertical axis represents the Return Loss (dB). According to the measurement result of fig. 3, if the second connection portion 250 of the sensing plate 220 is changed to a rectangular shape (non-meandering structure), the antenna structure 180 is easily interfered by the sensing plate 220, so that many unnecessary resonance modes (resonance modes) are induced. In other words, if the shape of the sensing plate 220 is too similar to that of the first radiation portion 120, the radiation performance of the antenna structure 180 may be seriously disturbed.

Fig. 4 is a return loss graph showing the antenna structure 180 of the electronic device 100 according to an embodiment of the invention, wherein the horizontal axis represents the operating frequency (MHz) and the vertical axis represents the return loss (dB). According to the measurement result of fig. 4, if the second connection portion 250 of the sensing plate 220 has a meandering structure (as shown in fig. 1B), the interference between the sensing plate 220 and the first radiation portion 120 can be reduced, and unnecessary resonance modes in the antenna structure 180 can be effectively suppressed. In this design, the antenna structure 180 of the electronic device 100 covers a first Frequency Band (Frequency Band) FB1, a second Frequency Band FB2, and a third Frequency Band FB 3. For example, the first frequency band FB1 may be approximately between 704MHz and 960MHz, the second frequency band FB2 may be approximately between 1710MHz and 2170MHz, and the third frequency band FB3 may be approximately between 2300MHz and 2700 MHz. Therefore, the antenna structure 180 of the electronic device 100 can support at least the wideband operation of lte (long Term evolution).

In some embodiments, the principle of operation of the antenna structure 180 of the electronic device 100 is as follows. The first radiation portion 120, the second radiation portion 160, and the third radiation portion 170 can be excited together to generate a first Frequency band FB1 and a third Frequency band FB3, wherein the third Frequency band FB3 can be regarded as a Double-Frequency Effect (Double-Frequency Effect) of the first Frequency band FB 1. In addition, the second radiation portion 160 can also be excited separately to generate the second frequency band FB 2.

Fig. 5 is a graph showing Antenna Efficiency (Antenna Efficiency) of the Antenna structure 180 of the electronic device 100 according to an embodiment of the invention, wherein the horizontal axis represents operating frequency (MHz) and the vertical axis represents Antenna Efficiency (dB). As shown in fig. 5, a first curve CC1 represents the radiation efficiency of the antenna structure 180 when the sensing plate 220 has no meandering second connection 250, and a second curve CC2 represents the radiation efficiency of the antenna structure 180 when the sensing plate 220 has meandering second connection 250. In detail, if the second connection portion 250 of the sensing plate 220 has a meandering structure, the Capacitance (Capacitance) between the antenna structure 180 and the sensing plate 220 can be reduced, so as to prevent the sensing plate 220 from negatively affecting the resonant mode of the antenna structure 180. According to the comparison result of fig. 5, after the meandering second connection portion 250 is added, the antenna efficiency of the antenna structure 180 of the electronic device 100 in the first frequency band FB1 can be improved by about 2dB, which can meet the practical application requirement of the general mobile communication device.

In some embodiments, the component dimensions of electronic device 100 are as follows. The thickness H1 of the dielectric substrate 110 (i.e., the distance between the first surface E1 and the second surface E2) is about 0.4mm to 1.6 mm. In the first radiation part 120, a sum (L1+ L3) of a length L1 (i.e., a length from the first end 131 to the second end 132) of the first branch 130 and a length L3 (i.e., a length from the first side 151 to the second side 152) of the first connection part 150 may be substantially equal to 0.25 times a wavelength (λ/4) of a center frequency of the first frequency band FB 1. The width W1 of the first leg 130 may be approximately 1 mm. The length L2 of the second leg 140 (i.e., the length from the first end 141 to the second end 142) may be substantially equal to the length L1 of the first leg 130. The width W2 of the second leg 140 may be about 1 mm. The length L3 of the first connection part 150 may be greater than or equal to 8mm, and the width W3 of the first connection part 150 may be greater than or equal to 5 mm. The length L4 of the second radiation part 160 (i.e., the length from the first end 161 to the second end 162) may be substantially equal to 0.25 times the wavelength (λ/4) of the center frequency of the second frequency band FB 2. The length L5 of the third radiating portion 170 (i.e., the length from the first end 171 to the second end 172) may be substantially equal to the length L1 of the first branch 130 or the length L2 of the second branch 140. In the sensing plate 220, the length L6 of the third branch 230 (i.e., the length from the first end 231 to the second end 232) may be substantially equal to the length L1 of the first branch 130. The length L7 of the fourth leg 240 (i.e., the length from the first end 241 to the second end 242) may be substantially equal to the length L2 of the second leg 140. The length L8 of the second connection portion 250 may be substantially equal to the length L3 of the first connection portion 150. The width W8 of the second connection part 250 may be substantially equal to the width W3 of the first connection part 150. The meandering line width WL of the second connection portion 250 may be about 0.5mm to 1 mm. The width of the first coupling gap GC1 may be approximately between 0.5mm to 2 mm. The width of the second coupling gap GC2 may be approximately between 0.5mm and 2 mm. The above size ranges are derived from a plurality of experimental results, which are helpful for optimizing the operating Bandwidth (Operation Bandwidth) and Impedance Matching (Impedance Matching) of the antenna structure 180 of the electronic device 100.

The present invention provides a novel electronic device, which not only can increase the radiation efficiency of the antenna structure (by about 30%) but also can increase the Detectable Distance (by about 10%) of the sensing plate by adding a meandering structure in the sensing plate. That is, the present invention can improve the operation performance of the antenna structure and increase the probability of detection by Specific Absorption Rate (SAR), so it is very suitable for various mobile communication devices.

It is noted that the above-mentioned device dimensions and device parameters are not limitations of the present invention. The designer can adjust these settings according to different needs. The electronic device of the present invention is not limited to the states illustrated in fig. 1 to 5. The present invention may include only any one or more features of any one or more of the embodiments of fig. 1-5. In other words, not all illustrated features may be required to be implemented in an electronic device of the present invention.

Ordinal numbers such as "first," "second," "third," etc., in the specification and in the claims, do not have a sequential relationship with each other, but are used merely to identify two different elements having the same name.

Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention.

Claims

1. An electronic device, comprising:

the dielectric substrate is provided with a first surface and a second surface which are opposite;

a first radiation part including a first branch, a second branch and a first connection part, wherein the first connection part is coupled between the first branch and the second branch, and the second branch is coupled to a ground potential;

a second radiation part with a feed-in point, wherein a first coupling gap is formed between the second radiation part and the first branch;

a third radiation part coupled to the feed point, wherein a second coupling gap is formed between the third radiation part and the first branch, and the second radiation part and the third radiation part are at least partially surrounded by the first radiation part; and

a sensing plate coupled to a proximity sensor and including a third branch, a fourth branch, and a second connection portion, wherein the second connection portion is coupled between the third branch and the fourth branch, and the second connection portion has a serpentine structure;

the first radiation part, the second radiation part and the third radiation part are all arranged on the first surface of the medium substrate, and the sensing plate is arranged on the second surface of the medium substrate;

wherein the first radiation part, the second radiation part and the third radiation part form an antenna structure together;

wherein the first connecting portion has a rectangular shape.

2. The electronic device of claim 1, wherein the width of the first connecting portion is much larger than the width of the first branch and the width of the second branch.

3. The electronic device of claim 1, wherein the third radiating portion further comprises an inverted U-shaped bent portion such that an end of the third radiating portion and an end of the second radiating portion extend in substantially the same direction.

4. The electronic device of claim 1, wherein the first branch has a first vertical projection on the second surface of the dielectric substrate, the first vertical projection completely overlaps with the third branch, the second branch has a second vertical projection on the second surface of the dielectric substrate, the second vertical projection completely overlaps with the fourth branch, the first connection portion has a third vertical projection on the second surface of the dielectric substrate, and the third vertical projection at least partially overlaps with the second connection portion.

5. The electronic device of claim 1, wherein a length of the third radiating portion is substantially equal to a length of the first branch or a length of the second branch.

6. The electronic device of claim 1, wherein the width of the first coupling gap is between 0.5mm to 2mm and the width of the second coupling gap is between 0.5mm to 2 mm.

7. The electronic device of claim 1, wherein the antenna structure covers a first frequency band between 704MHz and 960MHz, a second frequency band between 1710MHz and 2170MHz, and a third frequency band between 2300MHz and 2700 MHz.

8. The electronic device of claim 7, wherein the first radiating portion, the second radiating portion, and the third radiating portion are excited to generate the first frequency band and the third frequency band, and the second radiating portion is excited to generate the second frequency band.

9. The electronic device of claim 7, wherein the length of the second radiating portion is equal to 0.25 times the wavelength of the second frequency band.

10. The electronic device of claim 7, wherein the first connecting portion is rectangular, the length of the first connecting portion is at least 8mm, and the width of the first connecting portion is at least 5 mm.