TWI656691B - The antenna structure and wireless communication device having the antenna structure - Google Patents

The antenna structure and wireless communication device having the antenna structure

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Publication number
TWI656691B
TWI656691B TW106124440A TW106124440A TWI656691B TW I656691 B TWI656691 B TW I656691B TW 106124440 A TW106124440 A TW 106124440A TW 106124440 A TW106124440 A TW 106124440A TW I656691 B TWI656691 B TW I656691B
Authority
TW
Taiwan
Prior art keywords
metal
arm
frequency band
antenna structure
radiator
Prior art date
Application number
TW106124440A
Other languages
Chinese (zh)
Other versions
TW201806244A (en
Inventor
池榮聖
林德昌
許文昌
Original Assignee
群邁通訊股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to US201662365342P priority Critical
Priority to US62/365342 priority
Priority to US201662365391P priority
Priority to US62/365391 priority
Application filed by 群邁通訊股份有限公司 filed Critical 群邁通訊股份有限公司
Publication of TW201806244A publication Critical patent/TW201806244A/en
Application granted granted Critical
Publication of TWI656691B publication Critical patent/TWI656691B/en

Links

Abstract

An antenna structure includes a metal member, a first feeding portion, a first grounding portion, a first radiator, and a second radiator. The metal member includes a metal front frame, a metal back plate and a metal frame, and the metal frame has a groove and a metal front. A first break point and a second break point are opened on the frame, and a metal front frame between the first break point and the second break point forms a radiant section, and the current is fed from the first feed part to the radiant section and flows along the radiant section to the first The breakpoint and the first radiator are used to excite the radiation signal of the first frequency band, and the current flows along the radiation segment to the first ground portion to excite the radiation signal of the second frequency band, and the current flows along the radiation segment to the second breakpoint and the second radiator to excite Radiation signal in the third frequency band. A wireless communication device having the antenna structure is also provided.

Description

Antenna structure and wireless communication device having the same

The present invention relates to an antenna structure and a wireless communication device having the same.

With the advancement of wireless communication technology, wireless communication devices are constantly moving toward a thin and light trend, and consumers are increasingly demanding the appearance of products. Since the metal casing has advantages in appearance, mechanism strength, heat dissipation effect, etc., more and more manufacturers have designed wireless communication devices with metal casings, such as metal back plates, to meet the needs of consumers. However, the metal casing easily interferes with the signal radiated by the antenna disposed therein, and the broadband design is not easily achieved, resulting in poor radiation performance of the built-in antenna. Moreover, the metal back plate is usually provided with a slot and a break point, which will affect the integrity and aesthetics of the metal back plate.

In view of the above, it is necessary to provide an antenna structure and a wireless communication device having the same.

An antenna structure includes a metal member, a first feeding portion and a first ground portion, the metal member includes a metal front frame, a metal back plate and a metal frame, and the metal frame is sandwiched between the metal front frame and the metal a slot is formed in the metal frame, a first break point and a second break point are formed on the metal front frame, and the first break point and the second break point are respectively disposed in the slot The two ends of the second break point and the second break point communicate with the slot and extend to block the metal front frame, and the metal front frame between the first break point and the second break point forms radiation segment, The first feeding portion and the first ground portion are connected to the radiant portion, and the antenna structure further includes a first radiator and a second radiator, wherein the first radiator and the second radiator are respectively connected to the The two sides of the radiant section are respectively disposed adjacent to the first breakpoint and the second breakpoint, and the first grounding portion is disposed between the first breakpoint and the first feedthrough, and the current is from the first Feeding part is fed to the radiant section and flows along the radiant section to the first breakpoint and the first radiator to excite a radiation signal of the first frequency band, and the current is fed from the first feed part to the radiant section and Flowing along the radiant section to the first ground portion to excite a radiation signal of a second frequency band, current is fed from the first feed portion to the radiant section and flows along the radiant section to the second breakpoint and the second The radiator emits a radiation signal of the third frequency band, the frequency of the second frequency band is higher than the frequency of the first frequency band, and the frequency of the third frequency band is higher than the frequency of the second frequency band.

A wireless communication device comprising the antenna structure described above.

The antenna structure is configured by the metal member, and the slot and the break point on the metal member are disposed on the metal front frame and the metal frame, and are not disposed on the metal back plate, so that the The metal back plate constitutes an all-metal structure, that is, the metal back plate has no insulating slots, broken lines or break points, so that the metal back plate can avoid affecting the metal due to the setting of the slot, the broken line or the break point. The integrity and aesthetics of the back panel.

100‧‧‧Antenna structure

11‧‧‧Metal parts

111‧‧‧Metal front frame

112‧‧‧Metal backplane

113‧‧‧Metal border

114‧‧‧ accommodating space

115‧‧‧ top

116‧‧‧First side

117‧‧‧ second side

118‧‧‧ slotting

1112‧‧‧First breakpoint

1114‧‧‧second breakpoint

1116‧‧‧ third breakpoint

22‧‧‧First radiant section

24‧‧‧second radiant section

26‧‧‧The third radiant section

A1‧‧‧Metal short arm

A2‧‧‧Metal long arm

13‧‧‧First Feeding Department

14‧‧‧ Grounding Department

15‧‧‧ radiator

16‧‧‧Second Feeding Department

17‧‧‧First matching circuit

L1‧‧‧first inductance

C1‧‧‧first capacitor

L2‧‧‧second inductance

C2‧‧‧second capacitor

18‧‧‧Switching circuit

182‧‧‧Switch unit

184‧‧‧Switching components

19‧‧‧Second matching circuit

27, 29‧‧‧ Feeding source

L3‧‧‧ third inductance

200‧‧‧Wireless communication device

201‧‧‧Display unit

202‧‧‧ Rear double lens

203‧‧‧Receiver

204, 205‧‧‧ openings

207‧‧‧ front lens

210‧‧‧ boards

Example 2

500‧‧‧Antenna structure

51‧‧‧Metal parts

511‧‧‧ metal front frame

512‧‧‧Metal backplane

513‧‧‧Metal border

514‧‧‧ accommodating space

515‧‧‧ bottom

516‧‧‧ first side

517‧‧‧ second side

518‧‧‧ slotting

5112‧‧‧First breakpoint

5114‧‧‧second breakpoint

52‧‧‧radiation section

B1‧‧‧Metal long arm

B2‧‧‧Metal short arm

53‧‧‧First Feeding Department

54‧‧‧First grounding

55‧‧‧First radiator

56‧‧‧Second radiator

57‧‧‧ Third radiator

572‧‧‧First arm

574‧‧‧second arm

576‧‧‧ third arm

58‧‧‧Second Feeding Department

59‧‧‧Second grounding

62‧‧‧Matching circuit

68‧‧‧Feeding source

C1‧‧‧first capacitor

L1‧‧‧first inductance

L2‧‧‧second inductance

64‧‧‧First switching circuit

642‧‧‧First switching unit

644‧‧‧First switching element

66‧‧‧Second switching circuit

642‧‧‧Second switching unit

644‧‧‧Second switching element

600‧‧‧Wireless communication device

601‧‧‧ display unit

602‧‧‧ headphone socket

603‧‧‧USB connector

607‧‧‧Speaker

610‧‧‧Circuit board

1 is a schematic diagram of an antenna structure according to a first embodiment of the present invention applied to a wireless communication device.

2 is a schematic view showing the assembly of the antenna structure shown in FIG. 1.

3 is a schematic view of the wireless communication device of FIG. 1 from another angle.

4 is a current flow diagram of the antenna structure shown in FIG. 2 during operation.

Fig. 5 is a circuit diagram of a first matching circuit of the antenna structure of the first embodiment of the present invention.

Fig. 6 is a circuit diagram of a switching circuit of an antenna structure according to a first embodiment of the present invention.

Fig. 7 is a circuit diagram of a second matching circuit of the antenna structure of the first embodiment of the present invention.

FIG. 8 is a graph showing return loss of the first radiating section and the third radiating section of the antenna structure according to the first embodiment of the present invention.

Fig. 9 is a graph showing the return loss of the second radiating section 24 of the antenna structure according to the first embodiment of the present invention when it is in operation.

FIG. 10 is a graph showing the efficiency of the first radiating section 22 and the third radiating section 26 of the antenna structure according to the second embodiment of the present invention.

Figure 11 is a graph showing the efficiency of the second radiating section 24 of the antenna structure in operation according to the second embodiment of the present invention.

FIG. 12 is a schematic diagram of an antenna structure applied to a wireless communication device according to a second embodiment of the present invention.

FIG. 13 is a schematic view showing the assembly of the antenna structure shown in FIG.

Figure 14 is a schematic diagram of the wireless communication device of Figure 12 at another angle.

Fig. 15 is a current flow diagram when the antenna structure shown in Fig. 13 is in operation.

Figure 16 is a circuit diagram of a matching circuit of an antenna structure according to a second embodiment of the present invention.

Figure 17 is a circuit diagram of a first switching circuit of an antenna structure according to a second embodiment of the present invention.

Figure 18 is a circuit diagram of a second switching circuit of an antenna structure according to a second embodiment of the present invention.

FIG. 19 is a graph showing return loss curves of an antenna structure operating in a low frequency, intermediate frequency, and high frequency band according to a second embodiment of the present invention.

FIG. 20 is a graph showing return loss curves of an antenna structure working in a WiFi 2.4G band and a WiFi 5G band according to a second embodiment of the present invention.

FIG. 21 is a graph showing the efficiency of the antenna structure in the low frequency, intermediate frequency and high frequency bands according to the second embodiment of the present invention.

FIG. 22 is a graph showing efficiency when operating in a WiFi 2.4G frequency band and a WiFi 5G frequency band according to a second embodiment of the present invention.

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

It should be noted that when an element is referred to as being "electrically connected" to another element, it can be directly on the other element or the element can be present. When an element is considered to be "electrically connected" to another element, it can be a contact connection, for example, either a wire connection or a non-contact connection, for example, a non-contact coupling.

All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. The terminology used in the description of the present invention is for the purpose of describing particular embodiments and is not intended to limit the invention. The term "and/or" used herein includes any and all combinations of one or more of the associated listed items.

Some embodiments of the present invention are described in detail below with reference to the accompanying drawings. The features of the embodiments and examples described below can be combined with each other without conflict.

Example 1

Referring to FIG. 1, a first preferred embodiment of the present invention provides an antenna structure 100 that can be applied to a wireless communication device 200 such as a mobile phone or a personal digital assistant to transmit and receive radio waves to transmit and exchange wireless signals.

Referring to FIG. 2 and FIG. 3 together, the antenna structure 100 includes a metal member 11, a first feeding portion 13, a ground portion 14, a radiator 15, a second feeding portion 16, and a first matching circuit 17 (refer to FIG. 5). The switching circuit 18 (refer to FIG. 6) and the second matching circuit 19 (refer to FIG. 7).

The metal member 11 may be an outer casing of the wireless communication device 200. The metal member 11 includes a metal front frame 111, a metal back plate 112, and a metal frame 113. The metal front frame 111, the metal back plate 112, and the metal frame 113 may be integrally formed. The metal front frame 111, the metal back plate 112, and the metal frame 113 constitute an outer casing of the wireless communication device 200. An opening (not shown) is disposed on the metal front frame 111 for receiving the display unit 201 of the wireless communication device 200. It can be understood that the display unit 201 has a display plane exposed to the opening, and the display plane is disposed substantially parallel to the metal back plate 112.

The metal back plate 112 is disposed opposite to the metal front frame 111. The metal back plate 112 is directly connected to the metal frame 113. There is no gap between the metal back plate 112 and the metal frame 113. The metal back plate 112 is an integrally formed single metal piece. The metal back plate 112 is provided with openings 204 and 205 for exposing components such as the rear double lens 202 and the receiver 203. The metal back plate 112 is not disposed. Any slot, break or breakpoint used to separate the insulation of the metal backing plate 112 (see Figure 2). The metal backing plate 112 can serve as the ground of the antenna structure 100.

The metal frame 113 is interposed between the metal front frame 111 and the metal back plate 112, and is disposed around the circumference of the metal front frame 111 and the metal back plate 112, respectively, to be connected to the display unit. 201. The metal front frame 111 and the metal back plate 112 together form an accommodating space 114. The accommodating space 114 is configured to receive an electronic component or a circuit module of the circuit board 210, the processing unit, and the like of the wireless communication device 200. In this embodiment, the electronic component includes at least the rear dual lens 202, the receiver 203, and the front lens 207. The rear dual lens 202, the receiver 203, and the front lens 207 are arranged side by side and spaced apart. The circuit board 210 of the wireless communication device 200.

The metal frame 113 includes at least a top portion 115, a first side portion 116, and a second side portion 117. The top portion 115 connects the metal front frame 111 and the metal back plate 112. The first side portion 116 is opposite to the second side portion 117, and the two are respectively disposed at two ends of the top portion 115. It is preferably disposed vertically at both ends of the top portion 115. The first side portion 116 and the second side portion 117 are also connected to the metal front frame 111 and the metal back plate 112. A slot 118 is also defined in the metal frame 113. In this embodiment, the slots 118 are disposed on the top portion 115 and extend to the first side portion 116 and the second side portion 117, respectively. It can be understood that in other embodiments, the slot 118 may also be disposed only on the top portion 115 without extending to any one of the first side portion 116 and the second side portion 117, or the opening A slot 118 is disposed in the top portion 115 and extends only along one of the first side portion 116 and the second side portion 117.

The top edge of the metal front frame 111 is spaced apart from the first break point 1112 and the second break point 1114 . The first break point 1112 and the second break point 1114 are located between the two ends of the slot 118 . The metal front frame 111 defines a third break point 1116 corresponding to the first side 116 and a portion adjacent to the top edge. The third break point 1116 is located at one end of the slot 118. Specifically, the third break point 1116 is located at the end of the slot 118 on the first side portion 116. The break points 1112, 1114, 1116 are in communication with the slot 118 and extend to block the metal front frame 111. The three break points are divided into three parts from the metal front frame 111, and the three parts include at least a first radiating section 22, a second radiating section 24, and a third radiating section 26. In this embodiment, the first break point 1112 and the second break point 1114 are respectively disposed at opposite ends of the top edge of the metal front frame 111 near the corner, and the first radiant section 22 is located at the first break point 1112 and the first Between the two break points 1114; the second radiant section 24 is located between the second break point 1114 and the third break point 1116, and the second radiant section 24 extends from the top edge of the metal front frame 111 to the side and extends through a circular arc-shaped corner of the metal front frame 111; the third radiating section 26 is located between the first break point 1112 and the end of the slot 118 on the second side portion 117, and the third radiating section 26 It extends from the top edge of the metal front frame 111 to the other side and extends through another arcuate corner of the metal front frame 111. In addition, the slot 118 and the break points 1112, 1114, and 1116 are filled with an insulating material (for example, plastic, rubber, glass, wood, ceramics, etc., but not limited thereto), thereby further separating the first a radiating section 22, a second radiating section 24, a third radiating section 26 and the metal piece The rest of 11.

It can be understood that the upper half of the metal front frame 111 is not provided with other insulating slots, broken lines or break points except the break point, so the upper half of the metal front frame 111 has only three break points. 1112, 1114, 1116, no other breakpoints.

One end of the first feeding portion 13 can be electrically connected to the feeding source 27 through the first matching circuit 17 (please refer to FIG. 5 ), and the other end is electrically connected to the first radiating portion 22 , so that the first feeding portion 13 is The first radiant section 22 feeds current. In this embodiment, after the current is fed from the first feeding portion 13, the current is transmitted to the first breaking point 1112 and the second breaking point 1114 in the first radiating section 22, respectively, so that the first radiating section 22 is The first feeding portion 13 is divided into a metal short arm A1 facing the first breaking point 1112 and a metal long arm A2 facing the second breaking point 1114. In this embodiment, the position at which the first feeding portion 13 is inserted does not correspond to the middle of the first radiating portion 22, so the length of the metal long arm A2 is greater than the length of the metal short arm A1. The grounding portion 14 has one end connected to the metal short arm A1 and the other end connected to the ground plane through the switching circuit 18. The first feeding portion 13 and the ground portion 14 are both substantially L-shaped metal arms, and the two are substantially parallel to each other.

Referring to FIG. 5 , the first matching circuit 17 is disposed on the circuit board 210 . The first matching circuit 17 includes a first inductor L1, a first capacitor C1, a second inductor L2, and a second capacitor C2. One end of the first inductor L1 is electrically connected to the first feeding portion 13 , and the other end is electrically connected to the feeding source 27 through the first capacitor C1 . One end of the second inductor L2 is electrically connected between the first feeding portion 13 and the first inductor L1, and the other end is connected to the ground plane. One end of the second capacitor C2 is electrically connected between the first inductor L1 and the second inductor L2, and the other end is connected to the ground plane. In this embodiment, the inductance of the first inductor L1 is 1.5 nanohenry, the capacitance of the first capacitor C1 is 1.2 picofarads, and the inductance of the second inductor L2 is 10 nanohenries. The capacitance of the two capacitor C2 is 0.8 picofarads.

Referring to FIG. 6, the switching circuit 18 is disposed on the circuit board 210. Said One end of the switching circuit 18 is electrically connected to the ground portion 14 and the other end is connected to the ground plane. The switching circuit 18 includes a switching unit 182 and at least one switching element 184. The switching element 184 can be an inductor, a capacitor, or a combination of an inductor and a capacitor. The switching elements 184 are connected in parallel with each other, and one end thereof is electrically connected to the switching unit 182, and the other end is electrically connected to the ground plane. The other end of the switching unit 182 is electrically connected to the ground portion 14 . As such, by controlling the switching of the switching unit 182, the metal short arm A1 can be switched to a different switching element 184.

The first feeding portion 13 feeds a current from the feeding source 27 through the first matching circuit 17, and after the current is fed into the first radiant section 22, flows in two directions, one direction is along the metal The short arm A1 flows to the first break point 1112 to excite a first mode to generate a radiation signal of the first frequency band. After the current is fed into the first radiating section 22, the other direction of the current flows along the metal long arm A2 to the second break point 1114 to excite a second mode to generate a radiation signal of the second frequency band. In this embodiment, the first mode is an LTE-A intermediate frequency mode, the first frequency band is a 1710-2170 MHz frequency band, and the second mode is an LTE-A low frequency mode, the second frequency band. It is the 700-960MHz band.

Since each of the switching elements 184 of the switching circuit 18 has a different impedance, the frequency band of the second mode of the first radiating section 22 and the third radiating section 26 can be adjusted by the switching of the switching unit 182. The frequency band of the fourth mode. The adjustment of the frequency band is to shift the frequency band to a low frequency or to a high frequency. In this embodiment, when the switching unit 182 is switched to a switching element 184 having an inductance value of 25 nanohenry, the antenna structure 100 can operate in a low frequency band of 704-746 MHz and a high frequency band of 1710-2690 MHz. When the switching unit 182 is switched to a switching element 184 having an inductance value of 18 nanohenry, the antenna structure 100 can operate in the low frequency band 746-787 MHz. When the switching unit 182 is switched to a switching element 184 having an inductance value of 7.5 nanohenry, the antenna structure 100 can operate in the low frequency band of 850 MHz. When the switching unit 182 is switched to a switching element 184 having an inductance value of 3.6 nanohenry, the antenna structure 100 can operate in the low frequency band of 900 MHz.

The radiator 15 is substantially an L-shaped metal arm, one end of which is substantially perpendicularly connected to one end of the second radiating section 24 near the second break point 1114, and the other end is substantially perpendicularly connected to the second feed portion 16 One end. The other end of the second feeding portion 16 is electrically connected to the feeding source 29 through the second matching circuit 19 .

Referring to FIG. 7, the second matching circuit 19 is disposed on the circuit board 210. The second matching circuit 19 includes a third inductor L3. One end of the third inductor L3 is electrically connected to the second feeding portion 16 , and the other end is electrically connected to the ground plane. The feed source 29 is electrically connected between the second feed portion 16 and the third inductor L3. In this embodiment, the inductance of the third inductor L3 is 1.8 nanohenry. The radiator 15 feeds a current from the feed source 29 through the second feeding portion 16 and the second matching circuit 19, and the current flows along the radiator 15 and the second radiating portion 24 and flows to the third break point. 1116, to excite a third mode to generate a third frequency band of radiation signals. In this embodiment, the third mode is a GPS mode, and the third frequency band is a 1575 MHz band.

The third radiating section 26 is coupled from the metal short arm A1 to obtain a current, and a current flows along the third radiating section 26 to excite a fourth mode to generate a fourth band of radiation signals. In this embodiment, the fourth mode is an LTE-A high frequency mode, and the fourth frequency band is a 2300-2690 MHz frequency band.

The first feeding portion 13 is disposed between the receiver 203 and the front lens 207. The grounding portion 14 is disposed between the metal short arm A1 and the front lens 207. The radiator 15 and the second feeding portion 16 are disposed between the rear double lens 202 and the second radiation segment 24 .

The ground plane may be the metal backing plate 112. Alternatively, a shielding mask for shielding electromagnetic interference or a middle frame supporting the display unit 201 may be disposed on a side of the display unit 201 facing the metal back plate 112. The mask or the middle frame is made of a metal material. The ground plane may also be the mask or the middle frame. Alternatively, the metal back plate 112 can be connected Connect the mask or the middle frame to form a larger ground plane. The ground plane is the ground of the antenna structure 100. That is to say, each of the grounding portions or the grounding points are directly connected or indirectly connected to the grounding surface.

In this embodiment, to obtain better antenna characteristics, the width of the slot 118 can be set to be 3-4.5 mm. In this embodiment, the width of the slot 118 can be set to 3.83 mm, that is, the first radiating section 22, the second radiating section 24, and the third radiating section 26 are disposed at a distance of 3.83 mm from the metal backing plate 112. The first radiant section 22, the second radiant section 24, and the third radiant section 26 are caused to move away from the metal backing plate 112 to increase the antenna efficiency of the radiant section. The width of the breakpoints 1112, 1114, 1116 can be set to 1.5-2.5 mm. In this embodiment, the width of the breakpoints 1112, 1114, 1116 is set to 2 millimeters to further increase the antenna efficiency of the radiant section without affecting the overall appearance of the antenna structure 100.

FIG. 4 is a schematic diagram of current flow when the antenna structure 100 is in operation. When the current enters the first radiating section 22 from the first feeding portion 13, respectively flows in two directions, one of which flows through the metal short arm A1 and flows to the first breaking point 1112 ( In the path P1), the current path P1 excites the LTE-A intermediate frequency mode; the other direction of the current flows through the metal long arm A2 and flows to the second break point 1114, and the current direction thereof In the opposite direction of P1 (refer to path P2), circuit path P2 excites the LTE-A low frequency mode. When the current enters the radiator 15 from the second feeding portion 16, it sequentially flows through the radiator 15 and the second radiant section 24, and flows to the third break point 1116 (refer to the path P3), thereby exciting The GPS mode is derived. When the current is coupled from the metal short arm A1 to the third radiating section 26 and through the third radiating section 26 (refer to path P4), the LET-A high frequency mode is excited.

FIG. 8 is a graph showing return loss of the first radiating section 22 and the third radiating section 26 of the antenna structure 100 during operation. Wherein, the curve S81 is a return loss value when the first radiating section 22 operates in the low frequency band of 704-746 MHz; and the curve S82 is that the first radiating section 22 operates on the first radiating section 22 Return loss value in the low frequency band 746-787MHz; curve S83 is the return loss value when the first radiating section 22 operates in the low frequency band 850MHz; curve S84 is the return loss when the first radiating section 22 operates in the low frequency band 900MHz In value, the switching circuit 18 adjusts the frequency bands to present different frequency curve configurations. The curve S85 is a return loss value when the first radiating section 22 and the third radiating section 26 operate in the LTE-A intermediate frequency band (1710-2170 MHz). The curve S86 is a return loss value when the first radiating section 22 and the third radiating section 26 operate in the LTE-A high frequency band (1850-2690 MHz).

FIG. 9 is a graph of return loss (Return Loss) when the second radiating section 24 of the antenna structure 100 is in operation. Wherein, the curve S91 is a return loss value when the second radiating section 24 operates in the GPS band (1575 MHz).

FIG. 10 is a graph showing the efficiency of the first radiating section 22 and the third radiating section 26 of the antenna structure 100 when operating. The curve S101 is an efficiency curve when the first radiant section 22 operates in the low frequency band 704-746 MHz; the curve S102 is an efficiency curve when the first radiant section 22 operates in the low frequency band 746-787 MHz; and the curve S103 is the first radiant section 22 The efficiency curve when operating in the low frequency band of 850 MHz; the curve S104 is the efficiency curve when the first radiating section 22 operates in the low frequency band 900 MHz, and the switching circuit 18 adjusts the frequency band to present different frequency curve patterns. The curve S105 is an efficiency curve when the first radiating section 22 and the third radiating section 26 operate in the LTE-A IF band and the LTE-A HF band (1850-2690 MHz).

Figure 11 is a graph showing the efficiency of the second radiant section 24 of the antenna structure 100 during operation. Wherein, the curve S111 is the radiation efficiency when the second radiating section 24 operates in the GPS band (1575 MHz).

Obviously, as can be seen from FIG. 8 to FIG. 11 , the antenna structure 100 can work in the corresponding LTE-A low frequency band (700-960 MHz), the LTE-A intermediate frequency band (1710-2170 MHz), and the LTE-A high frequency band ( 2300-2690MHz). In addition, the antenna structure 100 can also operate in the GPS frequency band (1575 MHz), that is, covers low to medium, high frequency, wide frequency range, and when When the antenna structure 100 operates in the above frequency band, its operating frequency can meet the antenna working design requirements and has better radiation efficiency.

The antenna structure 100 is disposed on the metal front frame 111 and the metal frame 113 by the metal member 11 and the metal frame 11 is not disposed on the metal back plate. 112, the metal backing plate 112 is configured to be an all-metal structure, that is, the metal backing plate 112 has no insulating slots, broken lines or break points, so that the metal backing plate 112 can be prevented from being slotted or broken. The arrangement of the lines or breakpoints affects the integrity and aesthetics of the metal backing 112.

Example 2

Referring to FIG. 12, a second preferred embodiment of the present invention provides an antenna structure 500 that can be applied to a wireless communication device 600 such as a mobile phone or a personal digital assistant to transmit and receive radio waves to transmit and exchange wireless signals.

Referring to FIG. 12 and FIG. 13 , the antenna structure 500 includes a metal member 51 , a first feeding portion 53 , a first ground portion 54 , a first radiator 55 , a second radiator 56 , and a third radiator 57 . The second feeding portion 58, the second ground portion 59, the matching circuit 62 (refer to FIG. 16), the first switching circuit 64 (refer to FIG. 17), and the second switching circuit 66 (refer to FIG. 18).

The metal member 51 may be an outer casing of the wireless communication device 600. The metal member 51 includes a metal front frame 511, a metal back plate 512, and a metal frame 513. The metal front frame 511, the metal back plate 512, and the metal frame 513 may be integrally formed. The metal front frame 511, the metal back plate 512, and the metal frame 513 constitute an outer casing of the wireless communication device 600. An opening (not shown) is disposed on the metal front frame 511 for receiving the display unit 601 of the wireless communication device 600. It can be understood that the display unit 601 has a display plane exposed to the opening, and the display plane is disposed substantially parallel to the metal back plate 512.

Referring to FIG. 14 together, the metal back plate 512 is disposed opposite to the metal front frame 511. The metal back plate 512 is directly connected to the metal frame 513. The metal back plate 512 and gold There is no gap between the borders 513. The metal back plate 512 is an integrally formed single metal piece. The metal back plate 512 is provided with openings 604 and 605 for exposing components such as a rear double lens and a receiver. The metal back plate 512 is not provided with any use. The insulating slot, wire break or break point of the metal backing plate 512 is divided. The metal backing plate 512 can serve as the ground of the antenna structure 500.

The metal frame 513 is interposed between the metal front frame 511 and the metal back plate 512, and is disposed around the circumference of the metal front frame 511 and the metal back plate 512, respectively, to form with the display unit. 601. The metal front frame 511 and the metal back plate 512 together form an accommodating space 514. The accommodating space 514 is configured to receive an electronic component or a circuit module of the circuit board 610, the processing unit, and the like of the wireless communication device 600. In this embodiment, the electronic component includes at least the earphone socket 602, the USB connector 603, and the speaker 607. The earphone jack 602, the USB connector 603 and the speaker 607 are arranged side by side and spaced apart from the circuit board 610 of the wireless communication device 600.

The metal frame 513 includes at least a bottom portion 515, a first side portion 516, and a second side portion 517. The bottom portion 515 connects the metal front frame 511 and the metal back plate 512. The first side portion 516 is disposed opposite to the second side portion 517 , and is disposed at two ends of the bottom portion 515 , preferably perpendicularly disposed at two ends of the bottom portion 515 . The first side portion 516 and the second side portion 517 are also connected to the metal front frame 511 and the metal back plate 512. A slot 518 is also defined in the metal frame 513. In the embodiment, the slots 518 are disposed on the bottom portion 515 and extend to the first side portion 516 and the second side portion 517, respectively. It can be understood that in other embodiments, the slot 518 can also be disposed only on the bottom portion 515 without extending to any one of the first side portion 516 and the second side portion 517, or the opening A slot 518 is disposed in the bottom portion 515 and extends only along one of the first side portion 516 and the second side portion 517.

A first break point 5112 and a second break point 5114 are symmetrically opened on both sides of the metal front frame 511 adjacent to the bottom edge. The first breakpoint 5112 and the second breakpoint 5114 are respectively located The opposite ends of the slot 518. The break points 5112, 5114 are in communication with the slot 518 and extend to block the metal front frame 511. The portion of the metal front frame 511 located between the first break point 5112 and the second break point 5114 forms a radiant section 52. In the present embodiment, the radiant section 52 extends linearly from the bottom edge of the metal front frame 511. In addition, the slot 518 and the break points 5112 and 5114 are filled with an insulating material (for example, plastic, rubber, glass, wood, ceramic, etc., but not limited thereto), thereby separating the radiant section 52. With the rest of the metal member 51.

It can be understood that the lower half of the metal front frame 511 is not provided with other insulating slots, broken lines or break points except the break points 5112 and 5114, so the lower half of the metal front frame 511 has only two. Breakpoints 5112, 5114, no other breakpoints.

The first feeding portion 53 is connected to the radiating section 52 at one end, and the other end is connected to the feeding source 68 through the matching circuit 62, so that the first feeding portion 53 feeds current to the radiating section 52. In this embodiment, after the current is fed from the first feeding portion 53, the current is transmitted to the first break point 5112 and the second break point 5114 in the radiant section 52, so that the radiant section 52 is the first feed part. 53 is a separation point divided into a metal long arm B1 facing the first break point 5112 and a metal short arm B2 facing the second break point 5114. In the present embodiment, the position at which the first feeding portion 53 is inserted does not correspond to the middle of the radiating portion 52, so the length of the metal long arm B1 is greater than the length of the metal short arm B2.

Referring to FIG. 16, the matching circuit 62 is disposed on the circuit board 610. The matching circuit 62 includes a first capacitor C1, a first inductor L1, and a second inductor L2. One end of the first inductor L1 is electrically connected to the first feeding portion 53 , and the other end is electrically connected to the feeding source 68 . One end of the first capacitor C1 is electrically connected between the first inductor L1 and the feed source 68, and the other end is connected to the ground plane. One end of the second inductor L2 is electrically connected between the first inductor L1 and the first feeding portion 53, and the other end is connected to the ground plane. In this embodiment, the capacitance of the first capacitor C1 is 1 picofarad, the inductance of the first inductor L1 is 0.5 nanohenry, and the inductance of the second inductor L2 is 8.2 nanometer. Heng.

Referring to FIG. 17, the first ground portion 54 is disposed apart from the first feeding portion 53. One end of the first ground portion 54 is connected to the metal long arm B1, and the other end is connected to the ground plane through the first switching circuit 64. The first switching circuit 64 includes a first switching unit 642 and at least one first switching element 644. The first switching element 644 can be an inductor, a capacitor, or a combination of an inductor and a capacitor. The first switching elements 644 are connected in parallel with each other, and one end thereof is electrically connected to the first switching unit 642, and the other end is electrically connected to a ground plane. The other end of the first switching unit 642 is electrically connected to the first ground portion 54. As such, by controlling the switching of the first switching unit 642, the radiant section 52 can be switched to a different first switching element 644 through the first grounding portion 54. Each of the first switching elements 644 has a different impedance.

The first radiator 55 is connected to one end of the metal long arm B1 near the first break point 5112. In this embodiment, the first radiator 55 is substantially a linear metal arm connected to the metal front frame 511 and provided with a side of the first break point 5112 and substantially parallel to the metal front frame. The bottom edge of 511.

One end of the second radiator 56 is connected to one end of the metal short arm B2 near the second break point 5114, and the other end is connected to the ground plane through the second switching circuit 66. In this embodiment, the second radiator 56 is substantially an L-shaped metal arm connected to the side of the metal front frame 511 where the second break point 5114 is disposed. One of the second radiators 56 is substantially parallel to the bottom edge of the metal front frame 511. The first radiator 55, the first grounding portion 54, the first feeding portion 53 and the second radiator 56 are disposed between the first breaking point 5112 and the second breaking point 5114 in this order.

Referring to FIG. 18, the second switching circuit 66 is substantially identical in structure to the first switching circuit 64. The first switching circuit 64 and the second switching circuit 66 are both disposed on the circuit board 610. The second switching circuit 66 includes a second switching unit 662 and at least one second switching element. Piece 664. The second switching element 664 can be an inductor, a capacitor, or a combination of an inductor and a capacitor. The second switching elements 664 are connected in parallel with each other, and one end thereof is electrically connected to the second switching unit 662, and the other end is electrically connected to a ground plane. The other end of the second switching unit 662 is electrically connected to the second radiator 56. As such, by controlling the switching of the second switching unit 662, the metal short arm B2 can be switched to the different second switching element 664 by the second radiator 56. Each of the second switching elements 664 has a different impedance.

The first feeding portion 53 feeds a current from the feeding source 68 through the matching circuit 62, and the current is fed into the radiant section 52 and flows in two directions, one of which flows through the metal long arm B1. And flowing to the first break point 5112 and flowing to the first radiator 55, thereby exciting a first mode to generate a radiation signal of the first frequency band. In this embodiment, the first mode is an LTE-A low frequency mode, and the first frequency band is a 700-960 MHz frequency band. In addition, a current is fed into the radiant section 52 and flows along the metal long arm B1 to the first grounding portion 54 and the first switching circuit 64, thereby exciting a second mode to generate a radiation signal of the second frequency band. In this embodiment, the second mode is an LTE-A intermediate frequency mode, and the second frequency band is a 1710-2170 MHz frequency band. The other direction of current flow after feeding the radiant section 52 is to flow through the metal short arm B2, to the second break point 5114, and to the second radiator 56 and the second switching circuit 66, thereby A third mode is excited to generate a radiation signal of the third frequency band. In this embodiment, the third mode is an LTE-A high frequency mode, and the third frequency band is a 2300-2690 MHz frequency band.

By controlling the switching of the first switching unit 642, the metal long arm B1 can be switched to a different first switching element 644; by controlling the switching of the second switching unit 662, the metal short arm B2 can be made Switch to a different second switching element 664. Since each of the first switching element 644 and the second switching element 664 have different impedances, the first mode of the metal long arm B1 can be adjusted by switching between the first switching unit 642 and the second switching element 662 respectively. The first frequency band of the state and the third frequency band of the third mode of the metal short arm B2, and maintaining the second mode Has a stable and wide bandwidth. The adjustment of the frequency band is to shift the frequency band to a low frequency or to a high frequency.

In this embodiment, when the first switching unit 642 is switched to an open circuit and the second switching unit 662 is switched to the second switching element 664 having an inductance value of 2 nanohenry, the antenna structure 500 operates in a low frequency band of 700 MHz. And high frequency band 1710-1880MHz. When the first switching unit 642 is switched to the first switching element 644 having an inductance value of 39 nanohenry, and the second switching unit 662 is switched to the second switching element 664 having an inductance value of 2 nanohenry, the antenna structure 500 operates at a low frequency. Band 850MHz. When the first switching unit 642 is switched to the first switching element 644 having an inductance value of 18 nanohenry, and the second switching unit 662 is switched to the second switching element 664 having an inductance value of 2 nanohenry, the antenna structure 500 operates at a low frequency. The frequency band is 900MHz. When the first switching unit 642 is switched to the first switching element 644 having an inductance value of 4.3 nanohenry, and the second switching unit 662 is switched to the second switching element 664 having a capacitance value of 33 picofarads, the antenna structure 500 operates at a high level. Frequency band 1850-1990MHz. When the first switching unit 642 is switched to the first switching element 644 having an inductance value of 4.3 nanohenry, and the second switching unit 662 is switched to the second switching element 664 having a capacitance value of 2.8 picofarads, the antenna structure 500 operates at a high level. Frequency band 1920-2170MHz. When the first switching unit 642 is switched to the first switching element 644 having an inductance value of 4.3 nanohenry, and the second switching unit 662 is switched to the second switching element 664 having a capacitance value of 0.6 picofarads, the antenna structure 500 operates at a high level. Frequency band 2300-2400MHz. When the first switching unit 642 is switched to the first switching element 644 having an inductance value of 4.3 nanohenry, and the second switching unit 662 is switched to the second switching element 664 having a capacitance value of 0.3 picofarads, the antenna structure 500 operates at a high level. Frequency band 2500-2700MHz.

The third radiator 57 includes a first arm 572, a second arm 574, and a third arm 576 that are sequentially connected. The first arm 572, the second arm 574, and the third arm 576 are located on the same plane. The first arm 572 and the third arm 576 are substantially L-shaped metal arms respectively symmetrically connected to opposite ends of the second arm 574. The second arm 574 is substantially a linear metal arm with an interval parallel to the first A radiator 55 is provided. The second feeding portion 58 and the second ground portion 59 are both substantially linear metal arms, and the two are arranged in parallel. The second feeding portion 58 has one end connected substantially perpendicularly to the junction of the first arm 572 and the second arm 574 , and the other end electrically connected to the feeding source 68 . One end of the second grounding portion 59 is substantially perpendicularly connected to one end of the second arm 574 near the first arm 572, and the other end is connected to a ground plane. The third radiator 57 feeds a current from the feed source through the second feed portion 58. After the current is fed into the third radiator 57, the current flows in two directions, one direction flows through the second arm 574. And a third arm 576, thereby exciting a fourth mode to generate a radiation signal of the fourth frequency band. In this embodiment, the fourth mode is a WiFi 2.4G mode, and the fourth frequency band is a 2400-2485 MHz band. After the current is fed into the third radiator 57, the other direction of the flow is through the first arm 572, thereby exciting a fifth mode to generate a radiation signal of the fifth frequency band. In this embodiment, the fifth mode is a WiFi 5G mode, and the fifth frequency band is a 5150-5850 MHz band.

In this embodiment, the ground plane may be the metal back plate 512. Alternatively, a shielding mask for shielding electromagnetic interference or a middle frame supporting the display unit 601 may be disposed on a side of the display unit 601 facing the metal back plate 512. The mask or the middle frame is made of a metal material. The ground plane may also be the mask or the middle frame. Alternatively, the metal backing plate 512 can be attached to the mask or middle frame to form a larger ground plane. The ground plane is the ground of the antenna structure 500. That is to say, each of the grounding portions or the grounding points are directly connected or indirectly connected to the grounding surface.

In this embodiment, in order to obtain better antenna characteristics, the thickness of the wireless communication device 600 is set to 7.43 mm. The width of the slot 518 can be set to 3-4.5 mm, preferably 4.4 mm, that is, the radiant section 52 is set to 4.43 mm from the metal back plate 512, so that the radiant section 52 is away from the A metal backing plate 512 is provided to enhance the antenna efficiency of the radiating section. The width of the break points 5112, 5114 is set to 1.5-2.5 mm, preferably 2 mm. The antenna efficiency of the radiant section is further increased without affecting the overall appearance of the antenna structure 500. The thickness of the metal front frame 511 can be set to 2 mm, that is, the thickness of the break points 5112, 5114 can be set to 2 mm.

FIG. 15 is a schematic diagram of current flow when the antenna structure 500 is in operation. When the current enters the radiant section 52 from the first feeding portion 53, respectively flows in two directions, one of which flows through the metal long arm B1 and flows to the first breaking point 5112 and the first The radiator 55 (refer to the path P1) in turn excites the LTE-A low frequency mode. After entering the radiant section 52 from the first feeding portion 53, the current flows through the metal long arm B1 and flows to the grounding portion 54 (refer to the path P2), thereby exciting the LTE-A intermediate frequency mode. state. After entering the radiant section 52 from the first feeding portion 53, the current flows through the metal short arm B2 in the other direction, and flows to the second breaking point 5114 and the second radiator 56 (refer to the path P3). And inducing the LTE-A high frequency mode. The third radiator 57 feeds current from the second feeding portion 58 and flows in two directions, one of which flows through the second arm 574 and the third arm 576 (refer to the path P4), thereby exciting The WiFi 2.4G mode. After the third radiator 57 feeds current from the second feeding portion 58, the other direction of flow flows through the first arm 572 (refer to the path P5), thereby exciting the WiFi 5G mode.

The first feeding portion 53 and the first ground portion 54 are respectively disposed on opposite sides of the USB connector 603. The first radiator 55 and the third radiator 57 are spaced above the earphone socket 602, and the upper portion refers to a direction toward the display unit 601. The second radiator 56 is disposed between the speaker 607 and a bottom edge of the metal front frame 511.

FIG. 19 is a graph of return loss (Return Loss) when the antenna structure 500 operates in the LTE-A low frequency, intermediate frequency, and high frequency bands. The curve S191 is the return loss value when the antenna structure 500 operates in the 700 MHz band; the curve S192 is the return loss value when the antenna structure 500 operates in the 850 MHz band; and the curve S193 is the back when the antenna structure 500 operates in the 900 MHz band. The wave loss value; the curve S194 is the return loss value when the antenna structure 500 operates in the band 1710-1880 MHz; the curve S195 is the return loss value when the antenna structure 500 operates in the 1850-1990 MHz band; the curve S196 is the antenna structure 500 The return loss value in the 1920-2170 MHz band; the curve S197 is the return loss value when the antenna structure 500 operates in the 2300-2400 MHz band; and the curve S198 is the return loss value when the antenna structure 500 operates in the 2500-2700 MHz band.

20 is a return loss (Return Loss) curve of the antenna structure 500 when operating in a WiFi 2.4G band and a WiFi 5G band. The curve S201 is a return loss value when the antenna structure 500 operates in the 2400-2485 MHz frequency band, and the curve S202 is a return loss value when the antenna structure 500 operates in the 5150-5850 MHz frequency band.

21 is a graph showing the efficiency of the antenna structure 500 when operating in the LTE-A low frequency, intermediate frequency, and high frequency bands. The curve S211 is the efficiency when the antenna structure 500 operates in the 700 MHz frequency band; the curve S212 is the efficiency when the antenna structure 500 operates in the 850 MHz frequency band; the curve S213 is the efficiency when the antenna structure 500 operates in the 900 MHz frequency band; and the curve S214 is the antenna structure 500. The efficiency when operating in the 1710-1880 MHz band; the curve S215 is the efficiency when the antenna structure 500 operates in the 1850-1990 MHz band; the curve S216 is the efficiency when the antenna structure 500 operates in the 1920-2170 MHz band; the curve S217 is the antenna structure 500 Efficiency in the 2300-2400 MHz band; curve S218 is the efficiency when the antenna structure 500 operates in the 2500-2700 MHz band.

FIG. 22 is a graph showing the efficiency of the antenna structure 100 when operating in the WiFi 2.4G frequency band and the WiFi 5G frequency band. The curve S221 is the efficiency when the antenna structure 500 operates in the 2400-2485 MHz frequency band, and the curve S202 is the efficiency when the antenna structure 500 operates in the 5150-5850 MHz frequency band.

Obviously, the antenna structure 500 is applicable to an operating frequency range of LTE-A low frequency band (700-960 MHz), LTE-A intermediate frequency band (1710-2170 MHz), and LTE-A high frequency frequency. Segment (2300-2690MHz), WiFi 2.4G band (2400-2485MHz) and WiFi 5G band (5150-5850MHz), the frequency range is wide, can be applied to operation of multiple frequency bands, and when the antenna structure 500 works in the above frequency band When the operating frequency can meet the antenna design requirements, and has better radiation efficiency.

The antenna structure 500 is disposed on the metal front frame 511 and the metal frame 513 by the metal member 51, and the metal frame 51 is not disposed on the metal back plate. 512, the metal backing plate 512 is configured as an all-metal structure, that is, the metal backing plate 512 has no insulating slots, broken lines or break points, so that the metal backing plate 512 can avoid being slotted or broken. The arrangement of the lines or breakpoints affects the integrity and aesthetics of the metal backing plate 512.

It can be understood that the antenna structure 100 of the embodiment 1 of the present invention is the upper antenna of the wireless communication device, the antenna structure 500 of the embodiment 2 is the lower antenna of the wireless communication device, and the upper antenna of the embodiment 1 can be the lower antenna of the embodiment 2. Combined to form an antenna of a wireless communication device. For example, the wireless communication device can transmit a wireless signal using the lower antenna and receive the wireless signal together using the upper antenna and the lower antenna.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way. In addition, those skilled in the art can make other changes in the spirit of the present invention. Of course, the changes made in accordance with the spirit of the present invention should be included in the scope of the present invention.

Claims (18)

  1. An antenna structure includes a metal member, a first feeding portion and a first ground portion, the metal member includes a metal front frame, a metal back plate and a metal frame, and the metal frame is sandwiched between the metal front frame and the metal The improvement between the backplanes is that: the metal frame is provided with a slot, and the metal front frame defines a first break point and a second break point, wherein the first break point and the second break point are respectively set on The two ends of the slot, the first break point and the second break point communicate with the slot and extend to a metal partitioning the metal front frame, between the first break point and the second break point The front frame forms a radiant section, the first feeding part and the first grounding portion are connected to the radiant section, and the antenna structure further includes a first radiator and a second radiator, the first radiator and the second The radiators are respectively connected to the two sides of the radiant section and are respectively disposed adjacent to the first breakpoint and the second breakpoint, and the first grounding portion is disposed between the first breakpoint and the first feedthrough. Current is fed from the first feed to the radiant section and flows along the radiant section The first breakpoint and the first radiator are configured to excite a radiation signal of the first frequency band, and the current is fed from the first feed portion to the radiation segment and flows along the radiation segment to the first ground portion to excite the second a radiation signal of a frequency band, a current is fed from the first feed portion to the radiation segment and flows along the radiation segment to the second breakpoint and the second radiator to excite a radiation signal of the third frequency band, the second frequency band The frequency of the third frequency band is higher than the frequency of the second frequency band, the one end of the feeding portion is connected to the radiation segment, and the radiation segment is divided into the dividing points by the feeding portion. a metal long arm facing the first break point and a metal short arm facing the second break point, the length of the metal long arm being greater than the length of the metal short arm, the first radiator being connected to the metal long arm adjacent to the One end of the first breakpoint, the first radiator is substantially a linear metal arm connected to a side of the metal front frame provided with the first break point, and substantially parallel to the metal front frame Bottom edge.
  2. The antenna structure of claim 1, wherein the slot and the breakpoint are filled with an insulating material.
  3. The antenna structure of claim 1, wherein the antenna structure further includes a matching circuit, a first switching circuit, and a second switching circuit, and the other end of the feeding portion is electrically connected to the feeding through the matching circuit. Source.
  4. The antenna structure according to claim 3, wherein the ground portion is disposed apart from the feeding portion, one end of which is connected to the metal long arm, and the other end is connected to the ground plane through the first switching circuit.
  5. The antenna structure of claim 3, wherein the matching circuit includes a first capacitor, a first inductor, and a second inductor, the first inductor being electrically connected to the first feed portion and the other end Electrically connected to the feed source, the first capacitor is electrically connected to the first inductor and the feed source, the other end is connected to the ground plane, and the second inductor is electrically connected to the first end. An inductor is connected between the first feed portion and the other end to the ground plane.
  6. The antenna structure of claim 3, wherein one end of the second radiator is connected to one end of the metal short arm near the second break point, and the other end is connected to the second switching circuit. Ground, the second radiator is substantially an L-shaped metal arm and is connected to a side of the metal front frame provided with a second break point, wherein a portion of the second radiator is substantially parallel to a bottom of the metal front frame side.
  7. The antenna structure of claim 3, wherein the first switching circuit comprises a first switching unit and at least one first switching element, the first switching element being an inductor, a capacitor, or a combination of an inductor and a capacitor. The first switching elements are connected in parallel with each other, and one end thereof is electrically connected to the first switching unit, the other end is electrically connected to the ground plane, and the other end of the first switching unit is electrically connected to the first The grounding portion can switch the radiation segment to a different first switching element through the first grounding portion by controlling the switching of the first switching unit, and each of the first switching elements has a different impedance.
  8. The antenna structure of claim 7, wherein the second cut The circuit includes a second switching unit and an at least one second switching element, wherein the second switching element is an inductor, a capacitor, or a combination of an inductor and a capacitor, the second switching elements are connected in parallel with each other, and one end thereof is electrically connected to The second switching unit is electrically connected to the ground plane, and the other end of the second switching unit is electrically connected to the second radiator. By controlling switching of the second switching unit, the The metal short arm is switched by the second radiator to different second switching elements, each having a different impedance.
  9. The antenna structure according to claim 8, wherein the first feeding portion feeds a current from the feeding source through the matching circuit, and the current is fed into the radiant section and flows through the long arm of the metal, and flows. The first breakpoint flows to the first radiator, thereby exciting a first mode to generate a radiation signal of the first frequency band, where the first mode is an LTE-A low frequency mode, and the first frequency band is 700-960MHz band.
  10. The antenna structure of claim 9, wherein the current is fed into the radiating section and flows along the long arm of the metal to flow to the first grounding portion and the first switching circuit, thereby exciting a second mode. The second frequency band is a LTE-A intermediate frequency mode, and the second frequency band is a 1710-2170 MHz frequency band.
  11. The antenna structure of claim 10, wherein the current is fed into the radiant section, flows through the short metal arm, flows to the second breakpoint, and flows to the second radiator and The second switching circuit activates a third mode to generate a third frequency band of the LTE-A high frequency mode, and the third frequency band is a 2300-2690 MHz frequency band.
  12. The antenna structure of claim 11, wherein the metal long arm can be switched to a different first switching element by controlling switching of the first switching unit; by controlling the second switching unit Switching, the metal short arm can be switched to a different second switching element, since each of the first switching element and the second switching element has different resistance Reacting, so that the first frequency band of the first mode of the metal long arm and the third frequency band of the third mode of the metal short arm can be adjusted by switching between the first switching unit and the second switching element, respectively. The adjustment of the frequency band is to shift the frequency band to a low frequency or to a high frequency.
  13. The antenna structure of claim 1, wherein the antenna structure further includes a third radiator, a second feeding portion, and a second ground portion, wherein the third radiator includes a first arm, a first a second arm and a third arm, wherein the first arm, the second arm and the third arm are located on a same plane, and the first arm and the third arm are substantially L-shaped metal arms respectively symmetrically connected to the second arm The second arm is substantially a linear metal arm, and the interval is parallel to the first radiator. The second feeding portion and the second ground portion are substantially linear metal arms, and the two are spaced apart. Parallelly disposed, one end of the second feeding portion is substantially perpendicularly connected to the junction of the first arm and the second arm, and the other end is electrically connected to the feeding source. One end of the second ground portion is substantially perpendicularly connected to one end of the second arm near the first arm, and the other end is connected to a ground plane.
  14. The antenna structure of claim 13, wherein the third radiator feeds a current from the feed source through the second feed portion, and the current flows into the third radiator and flows in two directions respectively. One direction is flowing through the second arm and the third arm, thereby exciting a fourth mode to generate a fourth frequency band radiation signal, the fourth mode is a WiFi 2.4G mode, and the fourth frequency band is In the 2400-2485MHz frequency band, after the current is fed into the third radiator, the other direction of the flow is flowing through the first arm, thereby exciting a fifth mode to generate a radiation signal of the fifth frequency band, the fifth mode For the WiFi 5G mode, the fifth frequency band is the 5150-5850 MHz frequency band.
  15. The antenna structure of claim 1, wherein the width of the slot is set to be 3-4.5 mm, that is, the radiating section is set to be 3-4.5 mm from the metal back plate; the width of the break point Set to 1.5-2.5 mm.
  16. The antenna structure of claim 1, wherein the metal back plate is an integrally formed single metal piece, and the metal back plate is not provided with any for the division. Slotting, breaking or breaking of the insulation of the metal backing plate.
  17. A wireless communication device comprising the antenna structure according to any one of claims 1 to 16.
  18. The wireless communication device of claim 17, wherein the wireless communication device further comprises a headphone jack, a USB connector and a speaker, wherein the first feeding portion and the first ground portion are respectively disposed on the USB connector The first radiator and the third radiator are disposed above the earphone socket, and the second radiator is disposed between the speaker and a bottom edge of the metal front frame.
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TW201806236A (en) 2018-02-16
TW201806244A (en) 2018-02-16

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