TWI831867B - Antenna structure and wireless communication device with same - Google Patents

Abstract

The present invention provides an antenna structure including at least one antenna units. The antenna units are positioned apart from each other. Each antenna unit includes a first antenna, a second antenna, and a switching unit. The first antenna is a WIFI 2.4G/5G antenna. The second antenna is a 5G antenna. The first antenna is connected to different locations of the second antenna through the switching unit, thereby forming different grounding paths for switching different frequency bands of the second antenna.

Description

Antenna structure and wireless communication device having the same

The present invention relates to an antenna structure suitable for multi-frequency bands and a wireless communication device having the antenna structure.

With the development of modern communication technology, mobile devices have become an indispensable part of people's lives, and communication systems have increasingly higher requirements for communication efficiency. The fifth generation mobile communication technology 5G can meet the communication needs of faster speed and larger network capacity. To achieve this demand, the use of multi-antenna design MIMO (Multiple-Input Multiple-Output, multiple-input multiple-output) architecture is a commonly used design. . However, placing a structure suitable for multiple antennas such as 2G, 3G, 4G antennas and 5G MIMO simultaneously in the limited space of a mobile device is a major issue for antenna design and mobile device structural design.

In view of this, it is necessary to provide an antenna structure suitable for multiple frequency bands and a wireless communication device having the antenna structure.

An antenna structure used in a wireless communication device, including at least one antenna unit, the at least one antenna unit is arranged independently of each other, each antenna unit includes a first antenna, a second antenna and a switching unit, the first The antenna is a WIFI 2.4G/5G antenna, and the second antenna is a 5G antenna. The first antenna is connected to different positions of the second antenna through the switching unit, thereby forming different ground paths. , to switch different frequency bands of the second antenna.

A wireless communication device includes the antenna structure.

The antenna structure is configured by arranging at least one antenna unit, and each antenna unit has the same structure, so that the at least one antenna unit can form a MIMO architecture. Each antenna unit includes a corresponding first antenna and a second antenna, and by setting the switching unit, the first antenna combines with the switching unit to switch the ground path, thereby causing the second The 5G antenna composed of antennas can realize frequency band switching function while saving antenna design space. In addition, since the antenna units are set up independently, the 5G antennas (i.e. the second antennas) can be independent of each other in the 5G frequency band, can send and receive wireless signals at the same time, and achieve 5G upload and download speeds, thus improving communication efficiency.

100:Antenna structure

11, 12, 13, 14: Antenna unit

111:First antenna

1111: Feed section

1112:First radiating arm

1113:Second radiating arm

1114:The third radiating arm

1115: The first radiating section

1116: The second radiating section

1117: Ground section

113:Second antenna

1131:Slotting

115:Switching unit

117:Third antenna

200:Wireless communication device

201: Ground plane

203: Signal feed point

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

FIG. 2 is a partial structural diagram of an antenna unit in the antenna structure shown in FIG. 1 .

Figure 3 is a voltage standing wave ratio (Voltage Standing Wave Ratio, VSWR) curve diagram of the first antenna and the second antenna shown in Figure 2.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those with ordinary skill in the art without making creative efforts shall fall within the scope of protection of the present invention.

It should be noted that when one component is said to be "electrically connected" to another component, it may Directly on another element or there can also be an intermediate element. When one element is said to be "electrically connected" to another element, it can be a contact connection, for example, by means of a wire connection, or a non-contact connection, for example, by means of non-contact coupling.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which they belong. The terms used herein in the description of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention.

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

Referring to FIG. 1 , an embodiment of the present invention provides an antenna structure 100 for use in a wireless communication device 200 . The wireless communication device 200 may be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, a personal digital assistant (PDA), etc. The wireless communication device 200 uses the antenna structure 100 to send and receive multi-band wireless signals to achieve wireless communication.

The antenna structure 100 includes at least one antenna unit, for example four antenna units 11-14. In this embodiment, the antenna structure 100 can be disposed on a ground plane 201 (such as the middle frame of the wireless communication device 200) so as to be grounded through the ground plane 201. In addition, the antenna structure 100 is also electrically connected to a circuit board (not shown) to feed power signals from the circuit board.

It is understood that the antenna structure 100 can also be disposed on other carriers, and fed and grounded in other ways. For example, the antenna structure 100 can be directly disposed on the circuit board, and fed and grounded through the circuit board, or grounded through the metal shell of the wireless communication device 200 .

In this embodiment, four antenna units 11 - 14 are respectively disposed on the four corners of the wireless communication device 200 and constitute a 4*4 MIMO (Multiple-Input Multiple-Output, multiple-input multiple-output) architecture. For example, the antenna unit 11 is disposed at the upper left corner of the wireless communication device 200 . The antenna unit 12 is disposed at the upper right corner of the wireless communication device 200 . The antenna unit 13 is disposed at the lower left corner of the wireless communication device 200 . The antenna unit 14 is disposed at the lower right corner of the wireless communication device 200 .

In this embodiment, the four antenna units 11 - 14 have the same shape and structure. Here, one of the antenna units, such as the antenna unit 11 , is taken as an example to illustrate its structure.

In this embodiment, the antenna unit 11 includes a first antenna 111, a second antenna 113, a switching unit 115 and a third antenna 117.

Please refer to Figure 2. The first antenna 111 is a WIFI 2.4G/5G antenna, used to send and receive WIFI 2.4G and WIFI 5G signals. In this embodiment, the first antenna 111 includes a feed section 1111, a first radiating arm 1112, a second radiating arm 1113, a third radiating arm 1114, a first radiating section 1115, a second radiating section 1116 and a connecting element. Lot 1117.

The feed section 1111 is in the shape of a straight strip, and one end thereof is electrically connected to the signal feed point 203 of the circuit board to feed current signals to the first antenna 111 . The first radiating arm 1112 is generally in the shape of a straight strip, and one end thereof is vertically connected to one end of the feed section 1111 to form a generally L-shaped structure with the feed section 1111 . The second radiating arm 1113 is substantially straight. One end is vertically connected to an end of the first radiating arm 1112 away from the feed section 1111 , and the other end extends in a direction parallel to the feed section 1111 . The third radiating arm 1114 is generally in the shape of a straight strip, with one end vertically connected to an end of the second radiating arm 1113 away from the first radiating arm 1112, and the other end parallel to the first radiating arm 1112 and close to the first radiating arm 1112. Describe the direction of the feed section 1111 extend.

In this embodiment, the length of the feed section 1111 is greater than the length of the second radiating arm 1113 , and the length of the third radiating arm 1114 is shorter than the length of the first radiating arm 1112 . The feed section 1111 and the second radiating arm 1113 are disposed on the same side of the first radiating arm 1112, and form a substantially U-shaped structure with the first radiating arm 1112. The third radiating arm 1114 and the first radiating arm 1112 are disposed on the same side of the second radiating arm 1113, and form a substantially U-shaped structure with the second radiating arm 1113.

In this embodiment, the first radiating section 1115 is generally in the shape of a straight strip, which is disposed at the connection between the feed section 1111 and the first radiating arm 1112 and is located along an edge away from the first radiating arm 1112 direction extends. That is, the first radiating section 1115 and the first radiating arm 1112 are disposed at the same end of the feed section 1111 and extend in opposite directions, and together form a substantially T-shape with the feed section 1111 structure.

The second radiating section 1116 is generally in the shape of a straight strip, with one end vertically connected to the end of the first radiating section 1115 away from the feed section 1111, and the other end extending in a direction parallel to the feed section 1111. It forms a substantially L-shaped structure with the first radiating section 1115 .

In this embodiment, the length of the first radiating section 1115 is smaller than the length of the first radiating arm 1112 . The length of the second radiating section 1116 is smaller than the length of the second radiating arm 1113 . The overall length of the first radiating arm 1112 , the second radiating arm 1113 and the third radiating arm 1114 is greater than the overall length of the first radiating section 1115 and the second radiating section 1116 .

In this embodiment, the grounding section 1117 is generally in the shape of a straight strip. One end of the ground section 1117 is vertically connected to a side of the feed section 1111 close to the second radiating arm 1113, and extends in a direction parallel to the first radiating arm 1112 and close to the third radiating arm 1114. .

It can be understood that when the current is fed from the signal feeding point 203, the current will flow through the feeding section 1111, the first radiating arm 1112, the second radiating arm 1113 and the third radiating arm 1114 in sequence. , and then excite a first mode to generate a radiation signal in the first frequency band. At the same time, the current will also flow through the feed section 1111, the first radiating section 1115 and the second radiating section 1116 in sequence, thereby stimulating a second mode to generate a radiation signal in the second frequency band. In this embodiment, the first mode is the WIFI 2.4G mode, and the second mode is the WIFI 5G mode. The first frequency band is the WIFI 2.4G frequency band. The second frequency band is the WIFI 5G frequency band. That is, the feed section 1111, the first radiating arm 1112, the second radiating arm 1113 and the third radiating arm 1114 together constitute a WIFI 2.4G antenna. The feed section 1111, the first radiating section 1115 and the second radiating section 1116 constitute a WIFI 5G antenna.

It can be understood that in other embodiments, the shape and structure of the first antenna 111 are not limited to the above-mentioned ones, and may have a variety of different structures according to the design requirements of the wireless communication device 200 .

The second antenna 113 is a 5G antenna, used for sending and receiving wireless signals in the 5G frequency band. In this embodiment, the second antenna 113 is generally in the shape of a rectangular sheet. The second antenna 113 may be a metal sheet or other structure on the middle frame of the wireless communication device 200 . A slot 1131 is formed on one side of the second antenna 113 . The slot 1131 is generally elongated and extends horizontally from one side of the second antenna 113 in a direction parallel to the first radiating arm 1112, so that the second antenna 113 forms a slot. antenna.

It can be understood that in this embodiment, the switching unit 115 includes a connection terminal 1151, a first switching terminal 1153, a second switching terminal 1155 and a third switching terminal 1157. The connecting end 1151 is connected to the ground section 1117 of the first antenna 111 . The first switching terminal 1153 and the second switching terminal The end 1155 and the third switching end 1157 are respectively connected to different positions of the slot 1131, such as the first position G1, the second position G2 and the third position G3. The first position G1, the second position G2, and the third position G3 are arranged at intervals in sequence and are arranged in a direction gradually away from the opening end of the slot 1131.

In this embodiment, by switching the connection terminal 1151 to different switching terminals (such as the first switching terminal 1153, the second switching terminal 1155 and the third switching terminal 1157), the first antenna 111 is connected to different ground locations to form different ground paths to the slot 1131. That is to say, the second antenna 113 can be connected to the first antenna 111 through different positions, thereby achieving the effect of switching frequency bands. For example, when the connection terminal 1151 is switched to the first switching terminal 1153, the first antenna 111 is connected to the first position G1 of the second antenna 113 through the first switching terminal 1153, This causes the slot antenna formed by the second antenna 113 to switch to the first coupling frequency band. When the connection terminal 1151 is switched to the second switching terminal 1155, the first antenna 111 is connected to the second position G2 of the second antenna 113 through the second switching terminal 1155, so that The slot antenna formed by the second antenna 113 is switched to the second coupling frequency band. When the connection terminal 1151 is switched to the third switching terminal 1157, the first antenna 111 is connected to the third position G3 of the second antenna 113 through the third switching terminal 1157, so that The slot antenna formed by the second antenna 113 is switched to the third coupling frequency band.

In this embodiment, the frequency of the first coupling frequency band is the 5G frequency band 3300-3800MHz. The frequency of the second coupling frequency band is the 5G frequency band 3800-4400MHz. The frequency of the third coupling frequency band is the 5G frequency band 4400-5000MHz. That is to say, the second antenna 113 can work in the working frequency band 3300-5000MHz defined by 5G FRI, and by connecting the The terminals 1151 are respectively switched to different switching terminals to realize switching of the 5G frequency band.

Understandably, please refer to Figure 3 as well. Figure 3 is a voltage standing wave ratio (VSWR) curve diagram when the antenna structure 100 works in WIFI 2.4G mode, WIFI 5G mode and 5G mode. . The curve S31 is the VSWR value when the antenna structure 100 operates in the WIFI 2.4G mode. Curve S32 is the VSWR value when the antenna structure 100 operates in the WIFI 5G mode. Curve S33 is the VSWR value when the connection terminal 1151 in the antenna structure 100 is switched to the first switching terminal 1153 and the antenna structure 100 operates in the 5G frequency band 3300-3800MHz. Curve S34 is the VSWR value when the connection terminal 1151 in the antenna structure 100 is switched to the second switching terminal 1155 and the antenna structure 100 operates in the 5G frequency band 3800-4400MHz. Curve S35 is the VSWR value when the connection terminal 1151 in the antenna structure 100 is switched to the third switching terminal 1157 and the antenna structure 100 operates in the 5G frequency band 4400-5000MHz.

Obviously, the first antenna 111 and the second antenna 113 in the antenna structure 100 can be integrated together through the switching unit 115, so that the antenna structure 100 can work on WIFI 2.4G and WIFI 2.4G at the same time. WIFI 5G and 5G frequency bands effectively increase the entire operating bandwidth of the antenna structure 100, and the wireless communication device 200 can have both WIFI 2.4G/5G functions and 5G communication functions without additional antenna design space.

Understandably, please refer to FIG. 1 again. In this embodiment, the third antenna 117 is a 2G/3G/4G antenna, used for sending and receiving wireless signals in the 2G, 3G, and 4G frequency bands. In this embodiment, the 2G/3G/4G antenna can have a variety of different structures according to the design requirements of the wireless communication device 200. For example, the third antenna 117 can be disposed on the metal frame of the wireless communication device 200 and operate in the corresponding low frequency mode, medium frequency mode and high frequency mode. Among them, the low frequency The frequency of the mode is 699-960MHz. The frequency of the intermediate frequency mode is 1710-2170MHz. The frequency of the high-frequency mode is 2300-2690MHz.

Obviously, the antenna structure 100 of the present invention is configured with multiple antenna units 11-14, each of which has the same structure, so that the multiple antenna units 11-14 can form a MIMO architecture. Each antenna unit includes a corresponding first antenna 111 and a second antenna 113, and by setting the switching unit 115, the first antenna 111 combines with the switching unit 115 to switch the ground path, and then This enables the 5G antenna composed of the second antenna 113 to realize the frequency band switching function while saving antenna design space. In addition, since the antenna units 11-14 are independently arranged, the 5G antennas (i.e., the second antenna 113) can be independent of each other in the 5G frequency band, can send and receive wireless signals at the same time, and achieve 5G upload and download speeds. This improves communication efficiency. Furthermore, each of the antenna units is also provided with a third antenna 117, so that the third antenna 117, together with the first antenna 111 and the second antenna 113, can transmit and receive 2G, 3G, 4G, 5G and WIFI 2.4G/5G wireless signals have a wide range of applications.

The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention in any form. In addition, those skilled in the art can also make other changes within the spirit of the present invention. Of course, these changes made based on the spirit of the present invention should be included in the scope of protection claimed by the present invention.

100:Antenna structure

11, 12, 13, 14: Antenna unit

111:First antenna

113:Second antenna

115:Switching unit

117:Third antenna

200:Wireless communication device

201: Ground plane

203: Signal feed point

Claims (9)

An antenna structure used in a wireless communication device. The improvement is that the antenna structure includes at least one antenna unit. The at least one antenna unit is arranged independently of each other. Each antenna unit includes a first antenna and a second antenna. and a switching unit, the first antenna is a WIFI 2.4G/5G antenna, the second antenna is a 5G antenna, and the first antenna is connected to the second antenna through the switching unit. positions, thereby forming different ground paths to switch different frequency bands of the second antenna, wherein the second antenna is in a strip shape, and a slot is provided on the second antenna, and the slot is from the One side of the second antenna extends horizontally to the opposite side, so that the second antenna forms a slot antenna to send and receive wireless signals in the 5G frequency band; the switching unit includes a connecting end and a first switching end. , the second switching terminal and the third switching terminal, the connecting terminal is connected to the first antenna, the second switching terminal, the second switching terminal and the third switching terminal are respectively connected to the switch. The first position, the second position and the third position of the slot are formed by switching the connecting end to different switching ends and then connecting to different grounding positions to form different ground paths to the slot; The first position, the second position, and the third position are arranged at intervals in sequence and are arranged in a direction gradually away from the opening end of the slot. When the connecting end is switched to the first switching end, the second The antenna is switched to the first coupling frequency band. When the connection terminal is switched to the second switching terminal, the second antenna is switched to the second coupling frequency band. When the connection terminal is switched to the third switching terminal , the second antenna switches to the third coupling frequency band. The antenna structure according to claim 1, wherein the antenna structure includes four antenna units, and the four antenna units are arranged at four corners of the wireless communication device to jointly form a MIMO architecture. The antenna structure according to claim 1, wherein the frequency of the first coupling frequency band is 5G frequency band 3300-3800MHz, the frequency of the second coupling frequency band is 5G frequency band 3800-4400MHz, and the frequency of the third coupling frequency band is 5G frequency band 4400-5000MHz. The antenna structure according to claim 1, wherein the first antenna includes a feed section, a first radiating arm, a second radiating arm, a third radiating arm and a grounding section, and the feed section is in the shape of a straight strip, One end of it is electrically connected to a signal feed point, the first radiating arm is in the shape of a straight strip, and one end of it is vertically connected to one end of the feed section to form an L-shaped structure with the feed section. The second radiating arm is in the shape of a straight strip, with one end vertically connected to an end of the first radiating arm away from the feed section, and the other end extending in a direction parallel to the feed section. The third radiating arm is straight. In the shape of a strip, one end is vertically connected to an end of the second radiating arm away from the first radiating arm, and the other end extends in a direction parallel to the first radiating arm and close to the feed section, and the ground section is In the shape of a straight strip, one end of the ground segment is vertically connected to a side of the feed segment close to the second radiating arm, and extends in a direction parallel to the first radiating arm and close to the third radiating arm, The connection terminal is electrically connected to the ground section. The antenna structure according to claim 4, wherein the first antenna further includes a first radiating section and a second radiating section, the first radiating section is in the shape of a straight strip and is disposed between the feed section and the The connection point of the first radiating arm extends in a direction away from the first radiating arm. The second radiating section is in the shape of a straight strip, with one end vertically connected to the first radiating section away from the feed section. The other end extends in a direction parallel to the feed section to form an L-shaped structure with the first radiating section. The antenna structure of claim 5, wherein after the current is fed from the signal feeding point, the current flows through the feeding section, the first radiating arm, the second radiating arm and The third radiating arm further excites the WIFI 2.4G mode to generate a radiation signal in the WIFI 2.4G frequency band. At the same time, the current also flows through the feed section, the first radiating section and the second The radiation section then excites the WIFI 5G mode to generate the radiation signal of the WIFI 5G frequency band. The antenna structure as claimed in claim 1, wherein each antenna unit further includes a Three antennas, the third antenna is a 2G/3G/4G antenna, used to send and receive wireless signals in the 2G, 3G, and 4G frequency bands. A wireless communication device, the improvement of which is that the wireless communication device includes the antenna structure as described in any one of claims 1 to 7. The wireless communication device according to claim 8, wherein the wireless communication device includes a ground plane and a circuit board, the antenna structure is disposed on the ground plane, and the circuit board provides feed power to the antenna structure, Or the antenna structure is disposed on the circuit board, and the circuit board provides feed power and ground for the antenna structure.

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