TWI626787B - Antenna structure and wireless communication device with same - Google Patents

Abstract

The present invention provides an antenna structure, including an antenna body, a radiator, a connecting member, and a coupling member. The antenna body is grounded by the connecting member, and the radiator is a monopole antenna and is spaced apart from the antenna body. The connecting member is electrically connected to the radiator for feeding a current signal to the radiator, and the coupling member is spaced apart from the antenna body.

Description

Antenna structure and wireless communication device having the same

The 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 functions of diversification, thinning, and faster and more efficient data transmission. However, the space for accommodating antennas is becoming smaller and smaller. With the continuous development of Long Term Evolution (LTE) technology, the bandwidth of antennas continues to increase. Therefore, how to design an antenna with a wider bandwidth in a limited space is an important issue in antenna design.

In view of this, it is necessary to provide an antenna structure having a wider bandwidth.

In addition, it is also necessary to provide a wireless communication device having the antenna structure.

An antenna structure includes an antenna body, a radiator, a connecting member and a coupling member, wherein the antenna body is grounded by the connecting member, the radiator is a monopole antenna, and is spaced apart from the antenna body, the connection The device is electrically connected to the radiator for feeding a current signal to the radiator, and the coupling member is spaced apart from the antenna body.

A wireless communication device comprising the antenna structure described in the above item.

The antenna structure and the wireless communication device having the antenna structure utilize the The connector feeds the signal to the radiator, and the antenna body is grounded, and the antenna body and the coupling member are coupled to each other, thereby forming a composite excitation mode such as coupling between the single pole and the ground plane, so as to realize Antenna design with high frequency bandwidth (1710-2700MHz) and high radiation efficiency characteristics.

100, 400‧‧‧ antenna structure

11‧‧‧Antenna body

13‧‧‧ radiator

131‧‧‧First radiant section

133‧‧‧second radiant section

135‧‧‧ third radiant section

137‧‧‧fourth radiant section

139‧‧‧ fifth radiant section

15‧‧‧Connecting parts

151‧‧‧ Inner conductor

153‧‧‧Outer conductor

155‧‧‧Connecting Department

17‧‧‧Couplings

171‧‧‧ Grounding Department

200, 300‧‧‧ wireless communication devices

21‧‧‧ housing

211‧‧‧ accommodating space

23‧‧‧Substrate

231‧‧‧Feeding point

233‧‧‧ ground plane

25‧‧‧ microphone

26‧‧‧USB interface module

27‧‧‧Battery

28‧‧‧ clearance area

1 is a schematic structural diagram of a wireless communication device according to a first preferred embodiment of the present invention.

2 is a schematic diagram of the wireless communication device of FIG. 1 from another angle.

3 is a schematic view showing the size of an antenna structure in the wireless communication device shown in FIG. 1.

4 is a graph showing S-parameters (scattering parameters) of an antenna structure in the wireless communication device shown in FIG. 1.

FIG. 5 is a graph showing the antenna structure of the wireless communication device shown in FIG. 1 with the antenna body and the antenna element not provided with the antenna element.

6 is a graph showing an S parameter (scattering parameter) in which an antenna structure is respectively provided with a coupling member and a coupling member is not provided in the wireless communication device shown in FIG. 1.

7 is a graph showing S-parameters (scattering parameters) of the coupling members grounded and ungrounded when the antenna structure is provided with a coupling member in the wireless communication device shown in FIG. 1.

Figure 8 is a graph showing the radiation efficiency of the antenna structure in the wireless communication device shown in Figure 1.

FIG. 9 is a schematic structural diagram of a wireless communication apparatus according to a second preferred 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. Based on an embodiment of the present invention, the field has All other embodiments obtained by a person skilled in the art without creative efforts are within the scope of the present invention.

It should be noted that when an element is referred to as "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, a wire connection or a non-contact connection, for example, a non-contact coupling.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art. The terminology used in the description of the invention herein is for the purpose of describing the particular embodiments. 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 may be combined with each other without conflict.

Referring to FIG. 1, a first preferred embodiment of the present invention provides an antenna structure 100, which can be applied to a wireless communication device 200 such as a mobile phone, a personal digital assistant, an MP3 player, etc., for transmitting and receiving radio waves for transmission, Exchange wireless signals. In this embodiment, an MP3 player is taken as an example for illustration.

The wireless communication device 200 further includes a housing 21, a substrate 23, and at least one electronic component. The housing 21 can be made of an insulating material such as plastic, and has a substantially rectangular frame shape for forming a receiving space 211 for accommodating the antenna structure 100, the substrate 23, and the electronic components. In the embodiment, the substrate 23 is a printed circuit board (PCB), which can be made of a dielectric material such as epoxy glass fiber (FR4). The substrate 23 is disposed at the receiving One side of the space 211 is provided with a feeding point 231 (see FIG. 2) and a grounding surface 233 for respectively feeding the antenna structure 100 and providing grounding.

In this embodiment, the wireless communication device 200 includes three electronic components. The three electronic components can be a microphone 25, a Universal Serial Bus (USB) interface module 26, and a battery 27. Specifically, the microphone 25 is disposed on one side of the receiving space 211 and disposed opposite to the substrate 23 . The USB interface module 26 is disposed on the substrate 23 away from one end of the microphone 25. The battery 27 is disposed at a position of the middle of the substrate 23 for supplying power to the wireless communication device 200.

It will be appreciated that the wireless communication device 200 also includes a clearance area 28. The clearance area 28 is disposed in the receiving space 211 adjacent to one side of the microphone 25 and disposed opposite to the substrate 23 . In this embodiment, the size of the wireless communication device 200 is approximately 39*117*7.5 mm ³ . The size of the clearance area 28 is approximately 13*10 mm ² .

The antenna structure 100 is disposed in the receiving space 211. The antenna structure 100 includes an antenna body 11 , a radiator 13 , a connecting member 15 , and a coupling member 17 . The antenna body 11 may be made of a metal material, such as a copper foil. In this embodiment, the antenna body 11 has a substantially rectangular sheet shape. The antenna body 11 is disposed between the substrate 23 and the clearance area 28 and can be adhered to the housing 21 by glue or the like. That is, the clearance area 28 can be enclosed by the antenna body 11, the microphone 25, and the housing 21. The antenna body 11 is also electrically connected to the ground plane 233 of the substrate 23 for achieving large-area grounding.

In the embodiment, the radiator 13 is a monopole antenna disposed above the clearance area 28 and spaced apart from the antenna body 11 . The radiator 13 includes a first radiating section 131, a second radiating section 133, a third radiating section 135, and a fourth radiating section 137 which are sequentially connected. And a fifth radiating section 139. The first radiating section 131 is a rectangular sheet body disposed in parallel with the side of the antenna body 11 adjacent to the microphone 25. The second radiating section 133 has a substantially rectangular strip shape that is vertically connected to one end of the first radiating section 131 and extends in a direction away from the antenna body 11. The third radiating section 135 is substantially rectangular in shape. The third radiating section 135 and the first radiating section 131 are disposed on the same side of the second radiating section 133. One end of the third radiating section 135 is perpendicularly connected to the second radiating section 133 away from one end of the first radiating section 131, and the other end extends in a direction parallel to the first radiating section 131 to be opposite to the first radiating section The segment 131 and the second radiating segment 133 together form a U-shaped structure. In this embodiment, the width of the first radiating section 131 is greater than the width of the third radiating section 135, but the length thereof is slightly smaller than the length of the third radiating section 135.

The fourth radiating section 137 is substantially in the shape of a rectangular strip. One end of the fourth radiating section 137 is perpendicularly connected to one end of the third radiating section 135 away from the second radiating section 133, and the other end extends in a direction parallel to the second radiating section 133 and adjacent to the antenna body 11. Until the first radiant section 131 is crossed. The fifth radiating section 139 has a substantially rectangular strip shape. One end of the fifth radiating section 139 is perpendicularly connected to the fourth radiating section 137 away from one end of the third radiating section 135, and the other end is parallel to the first radiating section 131 and close to the second radiating section 133 The direction extends. In this embodiment, the length of the fourth radiating section 137 is greater than the length of the second radiating section 133. The fifth radiating section 139 is disposed between the antenna body 11 and the first radiator 131.

Referring to FIG. 2 together, in the embodiment, the connecting member 15 is a coaxial cable, which includes an inner conductor 151 and an outer conductor 153. One end of the inner conductor 151 may be electrically connected to the feed point 231 of the substrate 23 by a connection portion 155, and the other end is electrically connected to the radiator 13, for example The fifth radiating section 139 of the radiator 13 is electrically connected to feed the current signal from the substrate 23 to the radiator 13. One end of the outer conductor 153 is electrically connected to the ground plane 233 by the connecting portion 155, and the other end is electrically connected to the antenna body 11 such that the antenna body 11 is outside the connecting member 15 The conductor 153 is electrically connected to the ground plane 233 of the substrate 23, thereby achieving large-area grounding. Of course, it can be understood that, in other embodiments, the connector 15 is not limited to a coaxial cable, and may be other types of connectors for respectively feeding signals to the radiator 13 and causing the The antenna body 11 is grounded.

The coupling member 17 is made of a metal material. In this embodiment, the coupling member 17 can be a metal back frame bracket of the wireless communication device 200, such as a metal back frame bracket of the display screen of the wireless communication device 200. The coupling member 17 and the antenna body 11 are stacked in the receiving space 211 and located between the substrate 23 and the microphone 25 . Specifically, the antenna body 11 and the radiator 13 are disposed at a lower right corner of the wireless communication device 300, that is, below the left side of the microphone 25. The coupling member 17 is disposed at an upper right corner of the wireless communication device 300, that is, above the left side of the microphone 25. The coupling member 17 is spaced apart from the antenna body 11 to enable capacitive coupling of the coupling member 17 and the antenna body 11. It can be understood that the coupling member 17 can be disposed only apart from the antenna body 11 without being grounded, that is, suspended. Of course, in other embodiments, the coupling member 17 can also be spaced apart from the antenna body 11 and grounded. For example, in FIG. 2, the coupling member 17 can be electrically connected to the grounding surface 233 by a grounding portion 171, thereby further increasing the grounding area of the antenna structure 100.

Please refer to FIG. 3 , which is a schematic diagram of the antenna body 11 , the radiator 13 and the coupling member 17 in the antenna structure 100 . The length of the fifth radiating section 139 in the radiator 13 is L1. The fifth radiating section 139 has a width W. The fourth spoke The length of the shot 137 is L2. The length of the third radiating section 135 is L3. The length of the second radiating section 133 is L4. The length of the first radiating section 131 is L5. The distance between the fifth radiating section 139 and the antenna body 11 is g. The width of the antenna body 11 is L6. The length of the coupling member is L7. In the present embodiment, L1 = 6 mm, L2 = 9 mm, L3 = 10 mm, L4 = L5 = 6 mm, g = 1 mm, L6 = 12 mm, and L7 = 33 mm.

Please refer to FIG. 4 as a graph of the S parameter (scattering parameter) of the antenna structure 100 under the parameters shown in FIG. 3. FIG. 5 shows the antenna structure 100 under the parameters shown in FIG. 3 , and the antenna structure 100 is respectively provided with an antenna body 11 and an S parameter (scattering parameter) graph in which the antenna body 11 is not disposed. The curve S51 is an S11 value when the antenna structure 100 is not provided with the antenna body 11. A curve S52 is an S11 value when the antenna structure 11 is disposed in the antenna structure 100.

FIG. 6 is a graph showing the S-parameter (scattering parameter) of the antenna structure 100 under the parameters shown in FIG. 3 and the antenna structure 100 is respectively provided with a coupling member 17 and the coupling member 17 is not provided. The curve S61 is the S11 value when the antenna structure 100 is not provided with the coupling member 17. A curve S62 is an S11 value when the antenna structure 100 is provided with the coupling member 17 and the coupling member 17 is not grounded.

FIG. 7 is a graph of S-parameters (scattering parameters) when the antenna structure 100 is placed under the parameters shown in FIG. 3 and the antenna structure 100 is provided with the coupling member 17 when the coupling members 17 are grounded and ungrounded, respectively. The curve S71 is the S11 value when the antenna structure 100 is provided with the coupling member 17 and the coupling member 17 is not grounded. A curve S72 is an S11 value when the antenna structure 100 is provided with the coupling member 17 and the coupling member 17 is grounded.

Figure 8 is a graph showing the efficiency of the antenna structure 100 under the parameters shown in Figure 3. its The curve S81 is the radiation efficiency of the antenna structure 100. Curve S82 is the total radiation efficiency of the antenna structure 100.

Obviously, as is apparent from FIGS. 4 to 8, the antenna structure 100 can operate at least in the 1710-2700 MHz frequency band, and the antenna structure 100 has good radiation characteristics in the frequency band.

Please refer to FIG. 9, which is a wireless communication device 300 according to a second preferred embodiment of the present invention. It differs from the wireless communication device 200 in that the antenna structure 400 is different in position from the antenna structure 200. Specifically, the antenna body 11 and the radiator 13 are located in the upper right corner of the wireless communication device 300, that is, above the left side of the microphone 25 of the wireless communication device 300. The coupling member 17 is disposed at a lower right corner of the wireless communication device 300, that is, below the left side of the microphone 25 of the wireless communication device 300. The antenna structure 400 of this design is also unaffected by its high frequency characteristics, that is, it still has better high frequency characteristics.

It is apparent that the antenna structure 100/400 of the present invention and the wireless communication device 200/300 having the antenna structure 100/400 feed the signal to the radiator 13 by means of the connector 15, and the antenna body 11 is grounded while The antenna body 11 and the coupling member 17 are coupled to each other to form a composite excitation mode such as coupling between a single pole and a ground plane to realize an antenna design having a high frequency bandwidth (1710-2700 MHz) and high radiation efficiency characteristics. .

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 (10)

An antenna structure includes an antenna body, a radiator, a connecting member and a coupling member. The connecting member is a coaxial cable, and includes an inner conductor and an outer conductor. The antenna body is grounded by the outer conductor, and the radiator is a single a pole antenna, and is spaced apart from the antenna body, the inner conductor is electrically connected to the radiator for feeding a current signal to the radiator, and the coupling member is spaced apart from the antenna body, The radiator includes a first radiating section, a second radiating section, a third radiating section, a fourth radiating section and a fifth radiating section which are sequentially connected, and the first radiating section is disposed in parallel with one side of the antenna body, One end of the second radiating section is vertically connected to one end of the first radiating section, and the other end extends in a direction away from the antenna body; one end of the third radiating section is vertically connected to the second radiating section away from the first One end of the radiant section, the other end extending in a direction parallel to the first radiant section; one end of the fourth radiant section is perpendicularly connected to the third radiant section away from one end of the second radiant section, and the other end is flat The second radiating section extends in a direction close to the antenna body; one end of the fifth radiating section is perpendicularly connected to the fourth radiating section away from one end of the third radiating section, and the other end is parallel to the first A radiant section extends in a direction adjacent to the second radiant section. The antenna structure of claim 1, wherein one end of the inner conductor is electrically connected to the radiator, and the other end is electrically connected to a feed point to feed the current signal to the radiator. One end of the outer conductor is electrically connected to the antenna body, and the other end is grounded. An antenna structure according to claim 1, wherein the antenna is The body has a rectangular shape, the width of the first radiant section is greater than the width of the third radiant section, the length of the first radiant section is smaller than the length of the third radiant section, and the fourth radiant section is along Parallel to the second radiant section and extending in a direction close to the antenna body until the first radiant section is crossed. The antenna structure of claim 1, wherein the coupling member is a metal back frame bracket of a wireless communication device, and the coupling member is spaced apart from the antenna body and grounded. The antenna structure of claim 1, wherein the coupling member is a metal back frame bracket of a wireless communication device, and the coupling member is spaced apart from the antenna body and is not grounded. A wireless communication device comprising the antenna structure of any one of claims 1-5. The wireless communication device of claim 6, wherein the wireless communication device further includes a housing and a substrate, the housing forming a receiving space for receiving the antenna structure and the substrate, the substrate A feed point and a ground plane are provided, the radiator being electrically connected to the feed point by the connector, the antenna body being electrically connected to the ground plane. The wireless communication device of claim 7, wherein the housing is made of an insulating material, and the antenna body is adhered to the housing. The wireless communication device of claim 7, wherein the wireless communication device further comprises a clearance area, wherein the clearance area is disposed in the receiving space, and The radiant body is disposed opposite to the clearance area, and the antenna body and the coupling member are stacked in the accommodating space and disposed between the substrate and the clearance area. The wireless communication device of claim 9, wherein the wireless communication device comprises a microphone, a USB interface module, and a battery, wherein the microphone is disposed in the receiving space and disposed opposite to the substrate. The USB interface module is disposed on the substrate away from one side of the microphone, and the battery is disposed on the substrate for supplying power to the wireless communication device, where the clearing area is composed of the antenna body and the microphone And the housing is enclosed; the coupling member is disposed between the substrate and the microphone.