CN107645040B - Antenna structure and wireless communication device with same - Google Patents

Antenna structure and wireless communication device with same Download PDF

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Publication number
CN107645040B
CN107645040B CN201710482507.9A CN201710482507A CN107645040B CN 107645040 B CN107645040 B CN 107645040B CN 201710482507 A CN201710482507 A CN 201710482507A CN 107645040 B CN107645040 B CN 107645040B
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China
Prior art keywords
radiation
antenna
arm
mode
electrically
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CN201710482507.9A
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CN107645040A (en
Inventor
曾昱楷
黄国仑
邹明佑
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Shenzhen Futaihong Precision Industry Co Ltd
Chiun Mai Communication Systems Inc
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Shenzhen Futaihong Precision Industry Co Ltd
Chiun Mai Communication Systems Inc
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Priority to US62/364881 priority
Priority to US201662382762P priority
Priority to US62/382762 priority
Application filed by Shenzhen Futaihong Precision Industry Co Ltd, Chiun Mai Communication Systems Inc filed Critical Shenzhen Futaihong Precision Industry Co Ltd
Priority claimed from US15/653,679 external-priority patent/US10038234B2/en
Publication of CN107645040A publication Critical patent/CN107645040A/en
Application granted granted Critical
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Abstract

The invention provides an antenna structure, which comprises a shell, a first feed-in part, a first grounding part and a second grounding part, wherein the shell is provided with a slot, a first breakpoint and a gap, and the first breakpoint, the gap and the slot jointly divide the shell into a first part and a second part which are arranged at intervals; the first feed-in part divides the first part into a first radiation part and a second radiation part, a shell from the first feed-in part to the first breakpoint forms the first radiation part, a shell from the first feed-in part to the gap forms the second radiation part, the length of the second radiation part is smaller than that of the second part, the length of the second part is smaller than that of the first radiation part, the first part is used for exciting a first mode, and the second part is used for exciting a second mode. The antenna structure can effectively realize broadband design. The invention also provides a wireless communication device with the antenna structure.

Description

Antenna structure and wireless communication device with same
Technical Field
The invention relates to an antenna structure and a wireless communication device with the same.
Background
With the progress of wireless communication technology, electronic devices such as mobile phones and personal digital assistants are gradually developing towards the trend of function diversification, light weight, and faster and more efficient data transmission. However, the space for accommodating the antenna is smaller and smaller, and the bandwidth of the antenna is increasing with the continuous development of Long Term Evolution (LTE) technology. Therefore, how to design an antenna with a wider bandwidth in a limited space is an important issue for antenna design.
Disclosure of Invention
In view of the above, it is desirable to provide an antenna structure and a wireless communication device having the same.
An antenna structure comprising:
the shell is provided with a slot, a first breakpoint and a gap, the slot comprises a first end and a second end, the first breakpoint is arranged at a position of the shell corresponding to the first end and is communicated with the slot, the gap is arranged at a part of the shell corresponding to the space between the first end and the second end and is communicated with the slot, the first breakpoint, the gap and the slot jointly divide a first part and a second part which are arranged at intervals from the shell, the shell between the first breakpoint and the gap forms the first part, and the shell between the gap and the second end forms the second part;
the first feed-in part is electrically connected to the first part and divides the first part into a first radiation part and a second radiation part, the first feed-in part forms the first radiation part from the shell at the first breakpoint, and the first feed-in part forms the second radiation part from the shell at the gap;
a first ground part electrically connected to the first radiation part; and
a second ground part electrically connected to the second radiation part;
wherein the length of the second radiation part is smaller than the length of the second portion, the length of the second portion is smaller than the length of the first radiation part, the first portion is used for exciting a first mode, and the second portion is used for exciting a second mode.
A wireless communication device comprises the antenna structure.
The antenna structure and the wireless communication device with the antenna structure are arranged on the shell, and the antenna structure is divided from the shell by utilizing the slots and the breakpoints on the shell, so that the antenna structure is not limited by a clearance area and the limitation on the ground distance, the broadband design is effectively realized, and a better high-frequency effect is kept.
Drawings
Fig. 1 is a schematic diagram illustrating an antenna structure applied to a wireless communication device according to a first preferred embodiment of the present invention.
Fig. 2 is a schematic diagram of the wireless communication device shown in fig. 1 from another angle.
Fig. 3 is a current-carrying diagram of the antenna structure shown in fig. 1.
Fig. 4 is a circuit diagram of a first switching circuit in the antenna structure shown in fig. 1.
Fig. 5 is a circuit diagram of a second switching circuit in the antenna structure shown in fig. 1.
Fig. 6 is a graph of S-parameters (scattering parameters) of the antenna structure when the first switching unit switches to a different first switching element in the first switching circuit shown in fig. 4.
Fig. 7 is a graph of S-parameters (scattering parameters) of the antenna structure when the second switching unit switches to a different second switching element in the second switching circuit shown in fig. 5.
Fig. 8 is a graph of the total radiation efficiency of the antenna structure of fig. 1.
Fig. 9 is a schematic structural diagram of an antenna structure according to a second preferred embodiment of the present invention.
Fig. 10 is a current-carrying diagram of the antenna structure shown in fig. 9.
Fig. 11 is a graph of the S-parameter (scattering parameter) for the antenna structure of fig. 9 operating at low if.
Fig. 12 is a graph of S-parameters (scattering parameters) when the antenna structure shown in fig. 9 operates in the WIFI 2.4GHz band and the WIFI 5GHz band.
FIG. 13 is a graph of S-parameters (scattering parameters) for the antenna structure of FIG. 9 operating in the GPS/GLONASS frequency bands.
Fig. 14 is a schematic structural diagram of an antenna structure according to a third preferred embodiment of the present invention.
Fig. 15 is a current-carrying diagram of the antenna structure shown in fig. 14.
Fig. 16 is a circuit diagram of a second feeding element in the antenna structure shown in fig. 14.
Fig. 17 is a circuit diagram of another second feeding element in the antenna structure shown in fig. 14.
Fig. 18 is a graph showing S-parameters (scattering parameters) when the antenna structure shown in fig. 14 operates in the GPS/GLONASS band, the first-mode high-frequency band, the bluetooth band, and the Wi-Fi band.
FIG. 19 is a graph illustrating the total radiation efficiency of the antenna structure shown in FIG. 14 when the antenna structure operates in the GPS/GLONASS band, the first mode high frequency band, the Bluetooth band, and the Wi-Fi band.
Fig. 20 is a diagram illustrating an antenna structure applied to a wireless communication device according to a fourth preferred embodiment of the present invention.
Fig. 21 is a schematic diagram of the wireless communication device shown in fig. 20 from another angle.
Fig. 22 is an assembly diagram of the wireless communication device shown in fig. 20.
Fig. 23 is a schematic current diagram of the antenna structure shown in fig. 20.
Fig. 24 is a circuit diagram of a first switching circuit in the antenna structure shown in fig. 20.
Fig. 25 is a circuit diagram of a second switching circuit in the antenna structure shown in fig. 20.
Fig. 26 is a graph of the S-parameter (scattering parameter) for the antenna structure of fig. 20 operating at low, medium, and high frequencies.
Fig. 27 is a graph of the total radiation efficiency of the antenna structure of fig. 20 operating at low, medium, and high frequencies.
Description of the main elements
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that when an element is referred to as being "electrically connected" to another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "electrically connected" to another element, it can be connected by contact, e.g., by wires, or by contactless connection, e.g., by contactless coupling.
Unless defined otherwise, 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. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Some embodiments of the invention are described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
Examples 1 to 3
Referring to fig. 1, an antenna structure 100 for transmitting and receiving radio waves to transmit and exchange wireless signals in a wireless communication device 200 such as a mobile phone, a personal digital assistant, etc. is provided in a preferred embodiment of the present invention.
The antenna structure 100 includes a housing 11, a first feeding portion 12, a first grounding portion G1, a second grounding portion G2, a radiator 13, and two second feeding portions S1 and S2. In the present embodiment, the housing 11 at least includes a back plate 110, a front frame 111 and a frame 112. The back plate 110 may be made of metal or an insulating material. The front frame 111 and the frame 112 are made of metal material. The front frame 111 and the frame 112 may be integrally formed. The back plate 110 is disposed opposite to the front frame 111. The back plate 110, the front frame 111 and the bezel 112 constitute a housing of the wireless communication device 200. The frame 112 is sandwiched between the front frame 111 and the back plate 110, and is respectively disposed around the peripheries of the front frame 111 and the back plate 110, so as to form an accommodating space 113 together with the front frame 111 and the back plate 110. The accommodating space 113 is used for accommodating electronic components or circuit modules such as a substrate and a processing unit of the wireless communication device 200 therein.
In this embodiment, the frame 112 at least includes a terminal portion 114, a first side portion 115 and a second side portion 116. The end portion 114 may be a top end or a bottom end of the electronic device 100. The terminal portion 114 is connected to the front frame 111. The first side portion 115 and the second side portion 116 are disposed opposite to each other, and are disposed at two ends of the end portion 114, preferably vertically. The first side portion 115 and the second side portion 116 are also connected to the front frame 111.
The frame 112 is provided with a slot 117. In this embodiment, the slot 117 is disposed on the end portion 114 and extends to the first side portion 115 and the second side portion 116 respectively. The front frame 111 is provided with a first break point 118, a second break point 119 and a gap 120. The first breaking point 118, the second breaking point 119 and the gap 120 are all communicated with the slot 117 and extend to block the front frame 111. In this embodiment, the first breaking point 118 is opened on the front frame 111 and is communicated with the first end T1 of the slot 117 disposed on the first side portion 115. The second break point 119 is disposed on the front frame 111 and is communicated with the second end T2 of the slot 117 disposed on the second side 116. The slot 120 is disposed on the front frame 111 between the first end T1 and the second end T2, and is communicated with the slot 117. Thus, the slot 117, the first breaking point 118, the second breaking point 119 and the slit 120 are separated from the housing 11 to form a first portion a1 and a second portion a2 which are spaced apart from each other. The front frame 111 enclosed by the slot 117, the first break point 118 and the slit 120 in the housing 11 constitutes the first portion a 1. The front frame 111 enclosed by the slot 117, the second break point 119 and the slit 120 in the housing 11 forms the second portion a 2.
In this embodiment, the width of the slot 117 is approximately 3.5 mm. The widths of the first breakpoint 118 and the second breakpoint 119 are both approximately 3.5 mm. The width of the gap 120 is approximately 1.5 mm.
It is understood that, in the present embodiment, the slot 117 is opened on the side frame 112 and extends to the front frame 111, so that the first portion a1 and the second portion a2 are completely formed by a part of the front frame 111. Of course, in other embodiments, the opening position of the slot 117 may be adjusted according to specific requirements. For example, the slot 118 is opened at an end of the bezel 112 away from the front frame 111, so that the first portion a1 and the second portion a2 are formed by a portion of the front frame 111 and a portion of the bezel 112.
It is understood that, in other embodiments, the slot 117 may be disposed only on the end portion 114 and not extend to any one of the first side portion 115 and the second side portion 116, or the slot 117 may be disposed on the end portion 114 and only extend to one of the first side portion 115 and the second side portion 116. Thus, the positions of the first end T1 and the second end T2, the first breaking point 118 and the second breaking point 119 can be adjusted according to the position of the slot 117. For example, the first end T1 and the second end T2 may be located at the front frame 111 corresponding to the end portion 114. For example, one of the first and second ends T1 and T2 may be located at a position of the front frame 111 corresponding to the terminal portion 114, and the other of the first and second ends T1 and T2 may be located at a position of the front frame 111 corresponding to the first or second side portion 115 or 116. Obviously, the shape and position of the slot 117 and the positions of the first end T1 and the second end T2 on the frame 112 can be adjusted according to specific requirements, and it is only necessary to ensure that the slot 117, the first break point 118, the second break point 119 and the gap 120 can jointly divide the first portion a1 and the second portion a2 which are arranged at intervals from the housing 11.
It will be appreciated that in this embodiment, the second portion a2 of the antenna structure 100 is grounded. Specifically, one end of the second portion a2 near the second disconnection point 119 may be electrically connected to the ground plane of the wireless communication device 200 through a connection structure such as a spring, a probe, a wire, etc., so as to provide ground for the second portion a 2.
The wireless communication device 200 may include a display unit. The display unit may be disposed at an opening of the front frame 111 to close the accommodating space 113. A shielding cover (shielding mask) for shielding electromagnetic interference or a middle frame for supporting the display unit may be disposed on a side of the display unit facing the back plate 110. The shielding cover or the middle frame is made of metal materials. The ground plane may be the backplane 110 of the wireless communication device 200. The ground plane may be the shielding case or the middle frame, or the shielding case or the middle frame is electrically connected to the back plate 110. The ground plane is the ground of the antenna structure 100 and the wireless communication device 200.
One end of the first feeding part 12 is electrically connected to one end of the first portion a1 near the slot 120 to feed current to the first portion a 1. In the present embodiment, the first feeding element 12 divides the first portion a1 into two portions, i.e., a first radiation portion E1 and a second radiation portion E2. Wherein, the portion of the first feeding element 12 to the front frame 111 where the first break point 118 is disposed forms the first radiation portion E1. The portion of the first feeding element 12 to the front frame 111 where the slit 120 is provided forms the second radiation element E2.
It is understood that, in the present embodiment, the position where the first feeding element 12 is opened does not correspond to the middle of the first portion a1, and thus the length of the first radiating element E1 is greater than the length of the second radiating element E2. In addition, the length of the second portion a2 is also greater than the length of the second radiating part E2, but less than the length of the first radiating part E1.
The first ground portion G1 is electrically connected to the first radiating portion E1 and electrically connected to the ground plane to provide ground for the first radiating portion E1. The second grounding portion G2 is electrically connected to the second radiating portion E2 and electrically connected to the ground plane for providing ground for the second radiating portion E2. In this embodiment, the first grounding portion G1 is disposed at one end of the first radiation portion E1 close to the first break point 118. Specifically, the first ground portion G1 is provided at a right corner of the housing 11. The second grounding portion G2 is located between the slot 120 and the first feeding portion 12.
It is understood that, in other embodiments, the slot 117, the first break point 118, the second break point 119 and the gap 120 are filled with an insulating material (for example, but not limited to, plastic, rubber, glass, wood, ceramic, etc.), so as to separate the first radiation portion E1, the second radiation portion E2, the second portion a2 and the rest of the housing 11.
In the present embodiment, one of the second feeding elements, for example, the second feeding element S1, is electrically connected to the second portion a2 to feed current to the second portion a 2. Another second feeding element, for example, a second feeding element S2, is electrically connected to the radiator 13 to feed current to the radiator 13.
Referring to fig. 2, in the present embodiment, the radiator 13 is disposed in the accommodating space 113 and is close to the second portion a 2. The radiator 13 may be a Flexible Printed Circuit (FPC) or formed using a Laser Direct Structuring (LDS) process. The radiator 13 includes a connection portion 131, a first branch 132, and a second branch 133. The connecting portion 131, the first branch 132 and the second branch 133 are disposed in a coplanar manner. The connecting portion 131 is substantially L-shaped and includes a first connecting section 134 and a second connecting section 135. The first connection segment 134 is electrically connected to the second feeding part S2, and is disposed parallel to the terminal part 114 for feeding a current signal to the radiator 13. One end of the second connecting segment 135 is perpendicularly connected to the end of the first connecting segment 134 close to the second side portion 116, and the other end extends in a direction parallel to the second side portion 116 and close to the terminal portion 114, so as to form the L-shaped structure with the first connecting segment 134.
The first branch 132 includes a first extension 136, a second extension 137, and a third extension 138. The first extending section 136 is substantially rectangular, one end of the first extending section 136 is connected to one end of the second connecting section 135 far from the first connecting section 134, and the other end of the first extending section continues to extend along the extending direction of the second connecting section 135, that is, extends along the direction perpendicular to and far from the first connecting section 134, so as to be located on the same straight line with the second connecting section 135. The second extending section 137 is substantially rectangular, one end of the second extending section 137 is vertically connected to the end of the first extending section 136 far from the second connecting section 135, and the other end of the second extending section 137 extends along a direction parallel to the first connecting section 134 and far from the first extending section 136, that is, the second extending section 137 and the first connecting section 134 are respectively disposed on the same side of the second connecting section 135 and the first extending section 136, and are respectively disposed on two ends of the second connecting section 135 and the first extending section 136. The third extending section 138 is substantially rectangular and has one end electrically connected to the end of the second extending section 137 away from the first extending section 136, and the other end extending in a direction parallel to the second connecting section 135 and close to the first connecting section 134.
The second branch 133 is substantially L-shaped and includes a first resonant section 139 and a second resonant section 140. One end of the first resonant section 139 is perpendicularly connected to the connection point of the second connection section 135 and the first extension section 136, and extends in a direction parallel to the first connection section 134 and close to the second side 116. The second resonance section 140 is substantially rectangular and has one end vertically connected to the end of the first resonance section 139 away from the second connection section 135 and the first extension section 136, and the other end extending along a direction perpendicular to the first resonance section 139 and close to the second extension section 137, so as to form the L-shaped structure together with the first resonance section 139.
It will be appreciated that in this embodiment, the first part a1 is a diversity antenna. The second part a2 is a GPS antenna. The radiator 13 is a WIFI antenna. The first portion a1, the first feeding portion 12, the first grounding portion G1, and the second grounding portion G2 together form a dual inverted F antenna architecture, so as to receive and transmit signals of a first mode. The second part a2 constitutes an inverted F antenna structure directly feeding to receive and transmit signals of a second mode. In this embodiment, the radiator 13 is an inverted F antenna, and further receives and transmits a signal of a third mode. Of course, in other embodiments, the radiator 13 may also be a loop type or other type of antenna.
In another embodiment, a portion of the back plate 110 corresponding to the radiator 13 may be made of an insulating material, and the rest of the back plate 110 may be made of a metal material, so as to improve the return loss and radiation efficiency of the radiator 13.
It is understood that, in the present embodiment, the wireless communication device 200 further includes at least one electronic component. In the present embodiment, the wireless communication device 200 includes at least four electronic components, i.e., a first electronic component 201, a second electronic component 202, a third electronic component 203, and a fourth electronic component 204. In the present embodiment, the first electronic component 201 and the second electronic component 202 are both main camera modules, and are disposed between the first feeding portion 12 and the first grounding portion G1 at an interval. The third electronic component 203 is a front camera module, which is disposed between the radiator 13 and the second grounding portion G2 and is adjacent to the slot 120. The fourth electronic element 204 is an audio transceiver (receiver) disposed between the first feeding portion 12 and the second grounding portion G2.
Referring to fig. 3, when a current enters from the first feeding portion 12, the current flows into the first radiating portion E1 and is grounded through the first grounding portion G1 (see path P1). In addition, when the current enters from the first feeding portion 12, the current will also flow into the second radiation portion E2 and be grounded through the second grounding portion G2 (refer to path P2). In this way, the first radiation part E1 and the second radiation part E2 (i.e., the first part a1) jointly excite the first mode to generate the radiation signal of the first frequency band. In this embodiment, the first mode is an LTE mode, and includes a low-frequency mode, a middle-frequency mode, and a high-frequency mode, and the frequency ranges of the low-frequency mode, the middle-frequency mode, and the high-frequency mode are 734-960MHz, 1805-2170MHz, and 2300-2690MHz, respectively. Specifically, the first radiation section E1 generates a radiation signal of a low frequency, and the second radiation section E2 generates a radiation signal of a medium-high frequency.
When a current is fed from the second feeding part S1, the current flows into the second portion a2 and is grounded through the second portion a2 (see path P3), so that the second portion a2 excites a second mode to generate a radiation signal in a second frequency band, such as a GPS/GLONASS signal (1575-. When current is fed from the second feeding part S2, a part of the current passes through the connecting part 131 and flows through the first branch 132, and another part of the current passes through the connecting part 131 and flows through the second branch 133 (see path P4). Thus, the radiator 13 can operate in a third mode to generate a radiation signal of a third frequency band, such as a WIFI 2.4GHz mode and a WIFI 5GHz mode.
It is understood that, referring to fig. 2 again, in other embodiments, in order to make the first radiation portion E1 have a better low frequency bandwidth, the antenna structure 100 may further include a first switching circuit 15. One end of the first switching circuit 15 is electrically connected to the first radiation portion E1 through the first ground portion G1, and the other end is electrically connected to the ground plane, i.e., ground.
Referring to fig. 4, the first switching circuit 15 includes a first switching unit 151 and at least one first switching element 153. The first switching unit 151 is electrically connected to a first ground portion G1 to be electrically connected to the first radiation portion E1 through the first ground portion G1. The first switching element 153 may be an inductor, a capacitor, or a combination of an inductor and a capacitor. The first switching elements 153 are connected in parallel, and one end thereof is electrically connected to the first switching unit 151, and the other end thereof is electrically connected to the ground plane, i.e., ground. In this manner, by controlling the switching of the first switching unit 151, the first radiation portion E1 can be switched to a different first switching element 153. Since each of the first switching elements 153 has different impedance, the LTE low frequency band of the first radiation part E1 can be adjusted by switching of the first switching unit 151.
It is understood that, referring to fig. 2 again, in other embodiments, in order to make the second radiation portion E2 have a better medium-high frequency bandwidth, the antenna structure 100 may further include a second switching circuit 17. One end of the second switching circuit 17 is electrically connected to the second radiation portion E2 through the second ground portion G2, and the other end is electrically connected to the ground plane, i.e., ground.
Referring to fig. 5, the second switching circuit 17 includes a second switching unit 171 and at least one second switching element 173. The second switching unit 171 is electrically connected to the second ground portion G2 to be electrically connected to the second radiation portion E2 through the second ground portion G2. The second switching element 173 may be an inductor, a capacitor, or a combination of an inductor and a capacitor. The second switching elements 173 are connected in parallel, and one end of each of the second switching elements is electrically connected to the second switching unit 171, and the other end of each of the second switching elements is electrically connected to the ground plane, i.e., the ground. In this manner, by controlling the switching of the second switching unit 171, the second radiation portion E2 can be switched to a different second switching element 173. Since each of the second switching elements 173 has different impedance, the high-frequency band in LTE of the second radiation portion E2 can be adjusted by switching of the second switching unit 171.
As described above, the first part a1 may excite the first mode to generate radiation signals in LTE low, middle, and high frequency bands. The second portion A2 may excite a second mode to generate radiation signals in the GPS/GLONASS bands. The radiator 13 may excite the third mode to generate a radiation signal in the WIFI 2.4GHz/5GHz band. The wireless communication device 200 can simultaneously receive or transmit wireless signals in a plurality of different frequency bands using Carrier Aggregation (CA) technology of LTE-Advanced (LTE-Advanced) to increase transmission bandwidth. That is, the wireless communication device 200 may receive or transmit wireless signals in multiple different frequency bands simultaneously using the carrier aggregation technique and using the antenna structure 100 (e.g., the first portion a1), i.e., 2CA or 3CA is simultaneously implemented.
Fig. 6 is a graph of S-parameters (scattering parameters) of the antenna structure 100 when the first switching unit 151 switches to a different first switching element 153 in the first switching circuit 15. Obviously, when the first switching unit 151 in the first switching circuit 15 is switched to different first switching elements 153 (for example, two different first switching elements 153), since each first switching element 153 has different impedance, the switching of the first switching unit 151 can effectively adjust the frequency of the antenna structure 100 at a low frequency, thereby obtaining a better operation bandwidth.
Fig. 7 is a graph of S-parameters (scattering parameters) of the antenna structure 100 when the second switching unit 171 switches to a different second switching element 173 in the second switching circuit 17. Obviously, when the second switching unit 171 of the second switching circuit 17 is switched to different second switching elements 173 (for example, three different second switching elements 173), each second switching element 173 has different impedance, so that the switching of the second switching unit 171 can effectively adjust the frequency of the antenna structure 100 at the medium-high frequency, thereby obtaining a better operation bandwidth.
Fig. 8 is a graph of the overall radiation efficiency of the antenna structure 100. The curve S81 represents the total radiation efficiency of the antenna structure 100 at low frequency. Curve S82 is the total radiation efficiency of the antenna structure 100 at medium and high frequencies. Obviously, the antenna structure 100 can operate in the corresponding low, medium, and high frequency bands, and has a better high frequency bandwidth.
Fig. 9 is a schematic diagram of an antenna structure 300 according to a second preferred embodiment of the invention.
The antenna structure 300 includes a housing 11, a first feeding portion 12, a first grounding portion G1, a second grounding portion G2, a radiator 33, two second feeding portions S1 and S2, a first switching circuit 15, and a second switching circuit 17. The housing 11 is provided with a first breaking point 118, a second breaking point 119 and a slit 120, so as to divide the housing 11 into a first portion a1 and a second portion a 2. The first feeding part 12 is electrically connected to the first portion a1, thereby dividing the first portion a1 into a first radiation part E1 and a second radiation part E2. The first switching circuit 15 is electrically connected to the first radiation section E1 through the first ground section G1. The second switching circuit 17 is electrically connected to the second radiation section E2 through the second ground section G2.
In the present embodiment, the antenna structure 300 is different from the antenna structure 100 in that the specific structure of the radiator 33 is different from the structure of the radiator 13. Specifically, in this embodiment, the radiator 33 includes a first radiating arm 331, a second radiating arm 332, a third radiating arm 333, a fourth radiating arm 334, a fifth radiating arm 335, and a sixth radiating arm 336. The first radiation arm 331, the second radiation arm 332, the third radiation arm 333, the fourth radiation arm 334, the fifth radiation arm 335, and the sixth radiation arm 336 are disposed in a coplanar manner. The first radiating arm 331 has one end electrically connected to the second feeding portion S2 and the other end extending in a direction parallel to the second side portion 116 and close to the end portion 114. The second radiating arm 332 is substantially rectangular and has one end electrically connected to a middle position of the first radiating arm 331 on a side away from the second side portion 116, and extends in a direction parallel to the terminal portion 114 and close to the first side portion 115. One end of the third radiating arm 333 is perpendicularly connected to one end of the second radiating arm 332 away from the first radiating arm 331, and the other end extends in a direction parallel to the first radiating arm 331 and away from the terminal portion 114, and is grounded. One end of the fourth radiating arm 334 is vertically connected to the connection point of the second radiating arm 332 and the third radiating arm 333, and extends in a direction parallel to the first radiating arm 331 and close to the terminal portion 114, so as to form an "H" type structure together with the first radiating arm 331, the second radiating arm 332 and the third radiating arm 333. One end of the fifth radiating arm 335 is perpendicularly connected to one end of the fourth radiating arm 334 away from the third radiating arm 333, and extends in a direction parallel to the distal portion 114 and close to the second side portion 116. The sixth radiating arm 336 is substantially arc-shaped and is connected to an end of the fifth radiating arm 335 away from the fourth radiating arm 334.
It is understood that in other embodiments, the third radiating arm 333 may be omitted, that is, only the first radiating arm 331, the second radiating arm 332, the fourth radiating arm 334, the fifth radiating arm 335 and the sixth radiating arm 336 are provided, so that the radiator 33 forms a monopole antenna or other antenna structure.
It is understood that, in other embodiments, an end of the third radiating arm 333 may be electrically connected to the second feeding element S2, and an end of the first radiating arm 331 is grounded, that is, the feeding source and the grounding position in the radiator 33 may be interchanged.
It is understood that, in the present embodiment, the antenna structure 300 is further different from the antenna structure 100 in that the antenna structure 300 includes at least five electronic components, i.e., a first electronic component 301, a second electronic component 302, a third electronic component 303, a fourth electronic component 304, and a fifth electronic component 305. In this embodiment, the first electronic component 301 is a main camera module, and the second electronic component 302 is a headphone jack module, which are disposed between the first grounding portion G1 and the first feeding portion 12 at an interval. The third electronic component 303 is a front camera module, which is disposed between the radiator 33 and the second grounding portion G2 and is adjacent to the gap 120. The fourth electronic component 304 is a distance sensor (P-sensor) disposed between the third electronic component 303 and the second ground G2. The fifth electronic element 305 is an audio transceiver (receiver) disposed between the second electronic element 302 and the fourth electronic element 304, and disposed adjacent to the first feeding portion 12 and the second grounding portion G2.
Referring to fig. 10, when a current enters from the first feeding portion 12, the current flows into the first radiating portion E1 and is grounded through the first grounding portion G1 (see path P5). In addition, when the current enters from the first feeding portion 12, the current will also flow into the second radiation portion E2 and be grounded through the second grounding portion G2 (refer to path P6). In this way, the first radiation part E1 and the second radiation part E2 (i.e., the first part a1) jointly excite the first mode to generate the radiation signal of the first frequency band. In this embodiment, the first mode is an LTE mode, which includes a low-frequency mode, a middle-frequency mode and a high-frequency mode, and the frequency ranges thereof are 734-. Specifically, the first radiation section E1 generates a radiation signal of a low frequency, and the second radiation section E2 generates a radiation signal of a medium-high frequency.
When a current is fed from the second feeding part S1, the current flows into the second portion a2 and is grounded through the second portion a2 (see path P7), so that the second portion a2 excites a second mode to generate a radiation signal in a second frequency band, such as a GPS/GLONASS signal (1575-. When the current is fed from the second feeding portion S2, the current passes through the radiator 33 and the third radiating arm 333 and is grounded (see path P8). Thus, the radiator 33 can operate in a third mode to generate a radiation signal of a third frequency band, such as a WIFI 2.4GHz mode and a WIFI 5GHz mode.
Referring to fig. 11-13, fig. 11 is a graph illustrating S-parameters (scattering parameters) when the antenna structure 300 operates in LTE low, medium, and high frequency bands. Fig. 12 is a graph of S parameters (scattering parameters) when the antenna structure 300 operates in the WIFI 2.4GHz band and the WIFI 5GHz band. FIG. 13 is a graph of S-parameters (scattering parameters) for the antenna structure 300 operating in the GPS/GLONASS frequency bands.
Referring to fig. 14, an antenna structure 400 according to a third preferred embodiment of the invention is shown.
The antenna structure 400 includes a housing 11, a first feeding portion 12, a first grounding portion G1, a second grounding portion G2, a second feeding portion S2, a radiator 43, a first switching circuit 15, and a second switching circuit 17. The housing 11 is provided with a first breaking point 118, a second breaking point 119 and a slit 120, so as to divide the housing 11 into a first portion a1 and a second portion a 2. The first feeding part 12 is electrically connected to the first portion a1, thereby dividing the first portion a1 into a first radiation part E1 and a second radiation part E2. The first switching circuit 15 is electrically connected to the first radiation section E1 through the first ground section G1. The second switching circuit 17 is electrically connected to the second radiation section E2 through the second ground section G2.
In this embodiment, one of the differences between the antenna structure 400 and the antenna structure 100 is that the second portion a2 is grounded at a different position. Specifically, the second portion a2 is grounded at a position close to the slot 120. In addition, the antenna structure 400 includes only one second feeding element S2, i.e., the second feeding element S1 is omitted, and the specific structure of the radiator 43 is different from that of the radiator 13. Of course, it is understood that in other embodiments, the grounding position of the second portion a2 in the antenna structure 400 may be set to be the same as the grounding position of the second portion a2 in the antenna structure 100, that is, the second portion a2 is grounded at a position close to the second break point 119.
In this embodiment, the radiator 43 includes a first radiation segment 431, a second radiation segment 432, a third radiation segment 433, a fourth radiation segment 434, and a fifth radiation segment 435 connected in sequence. The first radiation segment 431 is substantially rectangular sheet-shaped, and one end thereof is electrically connected to the second feeding portion S2, and the other end thereof extends in a direction parallel to the terminal portion 114 and close to the second side portion 116. The second radiating segment 432 is substantially in the shape of a straight bar, one end of which is perpendicularly connected to the end of the first radiating segment 431 away from the second feeding portion S2, and the other end of which extends in a direction parallel to the second side portion 116 and away from the end portion 114. The third radiating section 433 is substantially a straight strip, one end of which is perpendicularly connected to the end of the second radiating section 432 away from the first radiating section 431, and the other end of which extends in a direction parallel to the end portion 114 and close to the second side portion 116. The fourth radiation section 434 is substantially in a straight strip shape, one end of the fourth radiation section 434 is vertically connected to one end of the third radiation section 433 away from the second radiation section 432, and the other end of the fourth radiation section 434 extends in a direction parallel to the second side portion 116 and close to the terminal portion 114, so as to form a U-shaped structure together with the second radiation section 432 and the third radiation section 433. The fifth radiation segment 435 is substantially in a straight strip shape, one end of which is vertically connected to one end of the fourth radiation segment 434 away from the third radiation segment 433, and the other end of which extends in a direction parallel to the terminal portion 114 and away from the second side portion 116, so as to form a U-shaped structure together with the third radiation segment 433 and the fourth radiation segment 434.
Referring to fig. 15, when a current enters from the first feeding portion 12, the current flows into the first radiating portion E1 and is grounded through the first grounding portion G1 (see path P9). In addition, when the current enters from the first feeding portion 12, the current will also flow into the second radiation portion E2 and be grounded through the second grounding portion G2 (refer to path P10). In this way, the first radiation part E1 and the second radiation part E2 (i.e., the first part a1) jointly excite the first mode to generate the radiation signal of the first frequency band. In this embodiment, the first mode is an LTE mode, which includes a low frequency mode and a medium frequency mode, and the frequency ranges thereof are 734-960MHz and 1805-2170MHz, respectively. Specifically, the first radiation section E1 generates a radiation signal of a low frequency, and the second radiation section E2 generates a radiation signal of an intermediate frequency.
When the current is fed from the second feeding element S2, the current flows into the radiator 43, so that the radiator 43 can operate in the third mode to generate the radiation signal of the third frequency band (see path P11). In this embodiment, the third mode includes an LTE high frequency band (2300-. In addition, when the current flows through the radiator 43, the current is also coupled to the second portion a2 and grounded (refer to path P12), so that the second portion a2 can excite the second mode to generate a radiation signal in a second frequency band, such as GPS/GLONASS signal (1575-.
Referring to fig. 16, in one embodiment, the second feeding element S2 includes a duplexer 451 and a signal extractor 453. Two output ends of the duplexer 451 are used for realizing the function of sharing a signal output/input path between the Wi-Fi 2.4GHz signal and the LTE high-frequency signal. In addition, the signal extractor 453 is used to provide the GPS/GLONASS signals and the non-GPS/GLONASS signals (e.g., Wi-Fi 2.4GHz signals and LTE high frequency signals) with the function of sharing the signal I/O path.
It is understood that, referring to fig. 17, in other embodiments, the second feeding element S2 may also include only the triplexer 455. The triplexer 455 is used to realize the function of sharing the input/output paths between the GPS/GLONASS signals and the non-GPS/GLONASS signals (e.g., Wi-Fi 2.4GHz and LTE high frequency signals).
Referring to fig. 18 and 19 together, fig. 18 is a graph showing S parameters (scattering parameters) when the antenna structure 400 operates in the GPS/GLONASS band, the first mode high frequency band, the bluetooth band, and the Wi-Fi band. Fig. 19 is a graph of the total radiation efficiency of the antenna structure 400 when operating in the GPS/GLONASS band, the first mode high frequency band, the bluetooth band, and the Wi-Fi band.
Obviously, the antenna structure 100/300/400 is disposed on the housing 11, and the slot 117, the first break point 118, the second break point 119 and the slot 120 on the housing 11 are used to divide the corresponding first portion a1 and the second portion a2 from the housing 11, so that the antenna structure 100/300/400 is not limited by the clearance and the limitation of the ground distance, thereby effectively implementing broadband design and maintaining a better high-frequency effect.
Example 4
Referring to fig. 20, a fourth preferred embodiment of the present invention provides an antenna structure 500, which can be applied to a wireless communication device 600 such as a mobile phone, a personal digital assistant, etc. for transmitting and receiving radio waves to transmit and exchange wireless signals.
Referring to fig. 21, the antenna structure 500 includes a housing 51, a feeding portion 53, a resonant portion 55, and a grounding portion 56. The housing 51 may be a casing of the wireless communication device 600. In the present embodiment, the housing 51 is made of a metal material. The housing 51 includes a front frame 511, a back plate 512, and a bezel 513. The front frame 511, the back plate 512 and the frame 513 may be integrally formed. The front bezel 511, back panel 512, and bezel 513 constitute the housing of the wireless communication device 600. The front frame 511 is provided with an opening (not shown) for accommodating the display unit 601 of the wireless communication device 600. It is understood that the display unit 601 has a display plane exposed in the opening and disposed substantially parallel to the back plate 512.
Referring to fig. 22, the back plate 512 is disposed opposite to the front frame 511. The back plate 512 is directly connected to the frame 513, and there is no gap between the back plate 512 and the frame 513. The back plate 512 is an integrally formed single metal plate, and openings 606 and 607 are formed in the back plate 512 to expose the camera lens 604 and the flash lamp 605. The backplane 512 is not provided with any slots, breaks or breakpoints for dividing the insulation of the backplane 512. The back plate 512 is equivalent to the ground of the antenna structure 500 and the wireless communication device 600.
The frame 513 is sandwiched between the front frame 511 and the back plate 512, and is respectively disposed around the peripheries of the front frame 511 and the back plate 512, so as to form an accommodating space 514 together with the display unit 601, the front frame 511 and the back plate 512. The accommodating space 514 is used for accommodating electronic components or circuit modules of the wireless communication device 600, such as a circuit board, a processing unit, and the like.
The frame 513 at least includes a terminal portion 515, a first side portion 516, and a second side portion 517. In this embodiment, the terminal portion 515 is a bottom end of the wireless communication device 600. The end portion 515 connects the front frame 511 and the rear plate 512. The first side portion 516 and the second side portion 517 are disposed opposite to each other, and are disposed at two ends of the end portion 515, preferably, vertically. The first side portion 516 and the second side portion 517 are also connected to the front frame 511 and the back plate 512.
The frame 513 is further provided with a first opening 518, a second opening 519 and a slot 520. The front frame 511 is provided with a first breakpoint 521 and a second breakpoint 522. The first opening 518 and the second opening 519 are opened in the end portion 515, and both are disposed at an interval and penetrate the end portion 515.
The wireless communication device 600 further comprises at least one electronic component. In the present embodiment, the wireless communication device 600 includes a first electronic element 602 and a second electronic element 603. The first electronic component 602 is an earphone interface module, which is disposed in the accommodating space 514 and adjacent to the second side 517. The first electronic component 602 corresponds to the first opening 518, so that a user can insert a headset through the first opening 518 to establish electrical connection with the first electronic component 602.
The second electronic component 603 is a USB module disposed in the accommodating space 514 and located between the first electronic component 602 and the first side 516. The second electronic component 603 corresponds to the second opening 519, so that a user can insert a USB device through the second opening 519 to establish an electrical connection with the second electronic component 603.
In this embodiment, the slot 520 is disposed on the end portion 515, communicates with the first opening 518 and the second opening 519, and extends to the first side portion 516 and the second side portion 517 respectively.
The first break point 521 and the second break point 522 are both communicated with the slot 520 and extend to block the front frame 511. In this embodiment, the first break point 521 is opened on the front frame 511 and is communicated with the first end D1 of the slot 520 disposed on the first side portion 516. The second breaking point 522 is disposed on the front frame 511 and is communicated with the second end D2 of the slot 520 disposed on the second side 517. Thus, the slot 520, the first break point 521 and the second break point 522 jointly divide the housing 51 into the antenna portion F1 and the ground region F2 which are spaced from each other. The portion of the housing 51 surrounded by the slot 520, the first break point 521 and the second break point 522 forms the antenna portion F1, and the remaining portion of the housing 51 forms the grounding region F2. In the present embodiment, the antenna portion F1 constitutes an antenna structure of the electronic device 500, and is used for receiving and/or transmitting radio waves to transmit and exchange wireless signals. The ground region F2 is grounded.
It is understood that, in this embodiment, the slot 520 is opened at one end of the side frame 513 close to the back plate 512 and extends to the edge of the front frame 511, so that the antenna portion F1 is completely formed by a part of the front frame 511. Of course, in other embodiments, the opening position of the slot 520 may also be adjusted according to specific requirements. For example, the slot 520 is opened at one end of the side frame 513 close to the back plate 512, and extends toward the front frame 511, so that the antenna portion F1 is formed by a part of the front frame 511 and a part of the side frame 513.
It is understood that, in other embodiments, the slot 520 may be disposed only on the end portion 515 and not extend to any one of the first side portion 516 and the second side portion 517, or the slot 520 may be disposed on the end portion 515 and only extend to one of the first side portion 516 and the second side portion 517. Thus, the positions of the first breaking point 521 and the second breaking point 522 can be adjusted according to the position of the slot 520. For example, the first break point 521 and the second break point 522 may be both opened at a position of the front frame 511 corresponding to the end portion 515. For example, one of the first break point 521 and the second break point 522 may be opened at a position of the front frame 511 corresponding to the end portion 515, and the other of the first break point 521 and the second break point 522 may be opened at a position of the front frame 511 corresponding to the first side portion 516 or the second side portion 517. Obviously, the shape and position of the slot 520 and the positions of the first breakpoint 521 and the second breakpoint 522 on the frame 512 can be adjusted according to specific requirements, and it is only required to ensure that the slot 520, the first breakpoint 521 and the second breakpoint 522 can jointly divide the housing 51 into the antenna portion F1 and the ground region F2 which are arranged at intervals.
It can be understood that, in the present embodiment, except for the positions of the first opening 518 and the second opening 519, the slot 520, the first breakpoint 521 and the second breakpoint 522 are filled with an insulating material (for example, plastic, rubber, glass, wood, ceramic, etc., but not limited thereto), so as to separate the antenna portion F1 from the ground region F2.
It can be understood that, in the present embodiment, the feeding portion 53 is disposed in the accommodating space 514 and located at a side of the first electronic element 602 adjacent to the second side portion 517. The feeding portion 53 is used for feeding current to the antenna portion F1, and divides the antenna portion F1 into two parts, i.e., a first branch B1 and a second branch B2. Wherein, the portion of the front frame 511 at one side of the feeding part 53 up to the first break point 521 forms the first branch B1. The portion of the front frame 511 on the other side of the feeding part 53 up to the second break 522 forms the second branch B2. In the present embodiment, the open position of the feeding portion 53 does not correspond to the middle of the antenna portion F1, so the length of the first branch B1 is greater than the length of the second branch B2. The length of the second branch B2 is equal to one quarter of the wavelength corresponding to the highest operating frequency of the second branch B2.
The resonance portion 55 is a zigzag sheet and is disposed in the accommodating space 514. The resonance portion 55 includes a first resonance section 551, a second resonance section 553, a third resonance section 555, and a fourth resonance section 557. The first resonance section 551, the second resonance section 553 and the third resonance section 555 are disposed in a coplanar manner and are disposed together in a plane substantially parallel to the backplate 512. The first resonant segment 551 has a substantially rectangular bar shape, and one end of the first resonant segment is perpendicularly connected to the side of the first branch B1 near the first break point 521 and extends in a direction parallel to the end portion 515 and near the second side portion 517. The second resonant segment 553 is substantially rectangular and has one end perpendicularly connected to one end of the first resonant segment 551 away from the first break point 521, and extends in a direction parallel to the first side portion 516 and close to the end portion 515. The third resonance section 555 is substantially in a rectangular bar shape, and one end of the third resonance section 555 is perpendicularly connected to one end of the second resonance section 553 away from the first resonance section 551, and extends in a direction parallel to the first resonance section 551 and close to the second side 517. The third resonant section 555 spans the second electronic element 603. The third resonance section 555 and the back plate 512 are respectively located at two sides of the second electronic element 603. The fourth resonant section 557 is entirely located in a plane perpendicular to the plane of the first resonant section 551 and the plane of the backplate 512. The fourth resonant section 557 is substantially a rectangular bar vertically connected to an end of the third resonant section 555 far from the second resonant section 553, extends in a direction close to the backplate 512, and is electrically connected to the backplate 512, i.e., grounded. In the present embodiment, the length of the third resonance section 555 is greater than that of the first resonance section 551, and the length of the first resonance section 551 is greater than that of the second resonance section 553.
The grounding portion 56 is disposed in the accommodating space 514. One end of the grounding portion 56 is electrically connected to the second branch B2 near the second break 522, and the other end is electrically connected to the back plate 512, i.e. to ground, thereby providing ground for the second branch B2.
It should be understood that, referring to fig. 23, in the present embodiment, after the current enters from the feeding portion 53, the current flows into the first branch B1 of the antenna portion F1, flows to the resonant portion 55, and is finally grounded through the fourth resonant section 557 of the resonant portion 55. Thus, the feeding portion 53, the first branch B1 and the resonant portion 55 together form a loop antenna, and together excite a first mode to generate a radiation signal of a first frequency band (please refer to path P1). Meanwhile, when a current enters from the feeding portion 53, the current flows into the second branch B2 of the antenna portion F1 and is grounded through the grounding portion 56. Thus, the feeding portion 53, the second branch B2 and the grounding portion 56 together form an inverted F antenna, and together excite a second mode to generate a radiation signal of a second frequency band (please refer to path P2). In this embodiment, the first mode is an LTE-a low-frequency mode. The first frequency band is the 704 and 960MHz frequency bands. The second mode is LTE-A medium and high frequency mode. The second frequency band has a higher frequency than the first frequency band. The second frequency bands include 1710-2170MHz and 2300-2690MHz frequency bands.
It is understood that, referring to fig. 21 and fig. 23 together, in other embodiments, in order to adjust the bandwidth of the first frequency band, i.e. make the electronic device 500 have a better low frequency bandwidth, the electronic device 500 further includes a first switching circuit 57. The first switching circuit 57 is disposed in the accommodating space 514. One end of the first switching circuit 57 is electrically connected to one end of the fourth resonant section 557 remote from the third resonant section 555 to be electrically connected to the first branch B1 through the resonant portion 55, and the other end of the first switching circuit 57 is electrically connected to the backplate 512, i.e., grounded.
Referring to fig. 24, the first switching circuit 57 includes a first switching unit 571 and at least one first switching element 573. The first switching unit 571 is electrically connected to the fourth resonant section 557 to be electrically connected to the first branch B1 through the resonant portion 55. The first switching element 573 may be an inductor, a capacitor, or a combination of an inductor and a capacitor. The first switching elements 573 are connected in parallel, and one end thereof is electrically connected to the first switching unit 571, and the other end thereof is electrically connected to the back plate 512, i.e. grounded. As such, by controlling the switching of the first switching unit 571, the fourth resonant section 557 can be switched to a different first switching element 573. Since each of the first switching elements 573 has different impedance, the first frequency band generated by the first mode of the first branch B1 can be adjusted by the switching of the first switching unit 571.
It is understood that, referring to fig. 21 and 23 again, in other embodiments, in order to make the second branch B2 have a better middle-high frequency bandwidth, the antenna structure 500 further includes a second switching circuit 58. One end of the second switching circuit 58 is electrically connected to the grounding part 56 to be electrically connected to the second branch B2 through the grounding part 56, and the other end is electrically connected to the back plate 512, i.e. to be grounded.
Referring to fig. 25, the second switching circuit 58 includes a second switching unit 581 and at least one second switching element 583. The second switching unit 581 is electrically connected to the ground connection portion 56 to be electrically connected to the second branch B2 through the ground connection portion 56. The second switching element 583 may be an inductor, a capacitor, or a combination of an inductor and a capacitor. The second switching elements 583 are connected in parallel, and one end of each of the second switching elements is electrically connected to the second switching unit 581, and the other end of each of the second switching elements is electrically connected to the backplane 512, i.e., grounded. In this way, by controlling the switching of the second switching unit 581, the second branch B2 can be switched to a different second switching element 583. Since each of the second switching elements 583 has a different impedance, the second frequency band generated by the second mode of the second branch B2 can be adjusted by switching the second switching unit 581.
It is understood that the backplate 512 can serve as a ground for the antenna structure 500 and the wireless communication device 600. In another embodiment, a shielding cover (shielding mask) for shielding electromagnetic interference or a middle frame for supporting the display unit 601 may be disposed on a side of the display unit 601 facing the back plate 512. The shielding cover or the middle frame is made of metal materials. The shield or bezel may be coupled to the backplane 512 to serve as a ground for the antenna structure 500 and the wireless communication device 600. At each of the above-mentioned points of grounding, the shielding case or the bezel may replace the back plate 512 for grounding the antenna structure 500 or the wireless communication device 600.
It is understood that, referring to fig. 21 again, in the present embodiment, the antenna structure 500 further includes a connection portion 59. The connecting portion 59 has a substantially rectangular bar shape. One end of the connection portion 59 is vertically connected to the first branch B1 near the second electronic component 603, and the other end is vertically connected to the third resonance section 555. The length of the first branch B1 between the feeding part 53 and the connection part 59 is substantially the same as the length of the second branch B2. Thus, the first branch B1 between the feeding part 53 and the connecting part 59, and the third resonance segment 555 between the connecting part 59 and the fourth resonance segment 557 may form another medium-high frequency resonance current, thereby effectively improving the radiation characteristic of the second frequency band of the second mode.
Fig. 26 is a graph of S parameters (scattering parameters) when the antenna structure 500 operates in an LTE-a low-frequency mode (704-. Fig. 27 is a total radiation efficiency curve diagram of the antenna structure 500 operating in the LTE-a low-frequency mode (704-.
It is obvious from fig. 26 and 27 that the antenna structure 500 can operate in the corresponding low frequency band, such as 704 and 960MHz band. In addition, the antenna structure 500 can also work in the middle frequency band (1710-. Furthermore, by providing the first switch circuit 57 and the second switch circuit 58, each of the first switch element 573 and/or the second switch element 583 has different impedance, so that the antenna structure 500 can be effectively adjusted in the low frequency band, the intermediate frequency band and the high frequency band by switching the first switch unit 571 and/or the second switch unit 581, thereby obtaining a better operation bandwidth.
As described in the previous embodiments, the antenna structure 500 divides the front frame 511 into the antenna portion F1 and the ground region F2 by providing the slot 520, the first break point 521 and the second break point 522. The antenna structure 500 is further provided with a feeding portion 53, so as to further divide the antenna portion F1 into a first branch B1 and a second branch B2, and a corresponding resonance portion 55 is provided, so that the feeding portion 53, the first branch B1 and the resonance portion 55 together form a loop antenna, so as to excite a first mode to generate a radiation signal of a low frequency band. In addition, the feeding portion 53 and the second branch B2 form an inverted F antenna to excite a second mode to generate a radiation signal in the middle and high frequency bands. Therefore, the wireless communication device 600 may receive or transmit wireless signals in a plurality of different frequency bands simultaneously with the first branch B1, the second branch B2 and the resonance part 55 using a Carrier Aggregation (CA) technology of LTE-Advanced (LTE-Advanced) to increase a transmission bandwidth.
In addition, the antenna structure 500 is provided with the housing 51, and the first opening 518, the second opening 519, the slot 519, the first breakpoint 521 and the second breakpoint 522 on the housing 51 are all disposed on the front frame 511 and the side frame 513 and are not disposed on the back plate 512, so that the back plate 512 constitutes an all-metal structure, that is, there is no insulated slot, broken line or breakpoint on the back plate 512, and the back plate 512 can avoid the integrity and the aesthetic property of the back plate 512 being affected by the arrangement of the slot, the broken line or the breakpoint.
The antenna structure 100 according to the first preferred embodiment of the present invention, the antenna structure 300 according to the second preferred embodiment of the present invention, the antenna structure 400 according to the third preferred embodiment of the present invention, and the antenna structure 500 according to the fourth preferred embodiment of the present invention can be applied to the same wireless communication device. For example, antenna structure 100, 300, or 400 is disposed at the upper end of the wireless communication device as a secondary antenna and antenna structure 500 is disposed at the lower end of the wireless communication device as a primary antenna. When the wireless communication apparatus transmits a wireless signal, the wireless communication apparatus transmits the wireless signal using the main antenna. When the wireless communication apparatus receives a wireless signal, the wireless communication apparatus receives the wireless signal using the main antenna and the sub antenna together.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention. Those skilled in the art can also make other changes and the like in the design of the present invention within the spirit of the present invention as long as they do not depart from the technical effects of the present invention. Such variations are intended to be included within the scope of the invention as claimed.

Claims (21)

1. An antenna structure comprising:
a back plate;
the shell is arranged on the periphery of the back plate, a slot, a first breakpoint and a gap are formed in the shell, the slot comprises a first end and a second end, the first breakpoint is arranged at a position, corresponding to the first end, of the shell, the gap is arranged at a position, corresponding to a position between the first end and the second end, of the shell, the first breakpoint, the gap and the slot are communicated with each other, the first breakpoint, the gap and the slot jointly divide a first part and a second part which are arranged at intervals from the shell, the shell between the first breakpoint and the gap forms the first part, and the shell between the gap and the second end forms the second part;
the first feed-in part is electrically connected to the first part and divides the first part into a first radiation part and a second radiation part, the first feed-in part forms the first radiation part from the shell at the first breakpoint, and the first feed-in part forms the second radiation part from the shell at the gap; a first ground part electrically connected to the first radiation part; and
a second ground part electrically connected to the second radiation part;
the radiator is arranged in the shell and is positioned in a plane parallel to the back plate; and
a second feed-in part electrically connected to the radiator;
wherein the length of the second radiation part is smaller than the length of the second portion, the length of the second portion is smaller than the length of the first radiation part, the first portion is used for exciting a first mode, and the second portion is used for exciting a second mode.
2. The antenna structure of claim 1, characterized in that: insulating materials are filled in the open groove, the first break point and the gap.
3. The antenna structure of claim 1, characterized in that: the shell at least comprises a front frame and a frame, the front frame and the back plate are arranged oppositely, the frame is arranged between the front frame and the back plate, the front frame surrounds the periphery of the frame, the groove is formed in the frame, and the first break point and the gap are formed in the front frame.
4. The antenna structure of claim 1, characterized in that: the shell is further provided with a second breakpoint, the second breakpoint is arranged at the position, corresponding to the second end, of the shell and communicated with the groove, the first breakpoint and the gap, and the shell between the gap and the second breakpoint forms the second part.
5. The antenna structure of claim 1, characterized in that: the antenna structure comprises two second feed-in parts, wherein one second feed-in part is electrically connected to the second part, the other second feed-in part is electrically connected to the radiator, and the second part is grounded.
6. The antenna structure of claim 5, characterized in that: when current enters from the first feed-in part, the current flows through the first radiation part and is grounded through the first grounding part, when current enters from the first feed-in part, the current also flows into the second radiation part and is grounded through the second grounding part, so that the first radiation part and the second radiation part jointly excite the first mode to generate a radiation signal of a first frequency band, when current is fed from one of the second feed-in parts, the current flows into the second part and is grounded through the second part, so that the second part excites the second mode to generate a radiation signal of a second frequency band, and when current is fed from the other second feed-in part, the current flows into the radiator to enable the radiator to work in a third mode to generate a radiation signal of a third frequency band.
7. The antenna structure of claim 6, characterized in that: the first modality is an LTE modality, the second modality is a GPS/GLONASS modality, and the third modality is a WIFI modality.
8. The antenna structure of claim 5, characterized in that: the radiator comprises a connecting part, a first branch and a second branch, the connecting part comprises a first connecting section and a second connecting section, the first connecting section is electrically connected to one of the second feed-in parts and used for feeding current signals to the radiator, one end of the second connecting section is vertically connected to the end part of the first connecting section so as to form an L-shaped structure with the first connecting section, the first branch comprises a first extending section, a second extending section and a third extending section, one end of the first extending section is connected to one end, away from the first connecting section, of the second connecting section, the other end of the first extending section continues to extend along the extending direction of the second connecting section so as to be positioned in the same straight line with the second connecting section, one end of the second extending section is vertically connected to one end, away from the second connecting section, of the second extending section extends along the direction parallel to the first connecting section and away from the first extending section, one end of the third extension section is electrically connected to the end part of the second extension section far away from the first extension section, the other end of the third extension section extends along the direction parallel to the second connection section and close to the first connection section, the second branch comprises a first resonance section and a second resonance section, one end of the first resonance section is vertically connected to the connection point of the second connection section and the first extension section and extends along the direction parallel to the first connection section, one end of the second resonance section is vertically connected to the end part of the first resonance section far away from the second connection section and the first extension section, and the other end of the second resonance section extends along the direction vertical to the first resonance section and close to the second extension section, so that the third extension section and the first resonance section form an L-shaped structure together.
9. The antenna structure of claim 5, characterized in that: the antenna structure further comprises a third grounding part, the radiator comprises a first radiating arm, a second radiating arm, a third radiating arm, a fourth radiating arm, a fifth radiating arm and a sixth radiating arm, one end of the second radiating arm is vertically and electrically connected to the middle position of one side of the first radiating arm, one end of the third radiating arm is vertically connected to one end, away from the first radiating arm, of the second radiating arm, the other end of the third radiating arm extends in a direction parallel to the first radiating arm, one end of the fourth radiating arm is vertically connected to the connection position of the second radiating arm and the third radiating arm and extends in a direction parallel to the first radiating arm and away from the third radiating arm so as to form an 'H' type structure together with the first radiating arm, the second radiating arm and the third radiating arm, one end of the fifth radiating arm is vertically connected to one end, away from the third radiating arm, of the fourth radiating arm, and extend along the direction parallel to the second radiating arm, the sixth radiating arm is arc-shaped, the arc of the sixth radiating arm is connected to one end of the fifth radiating arm far away from the fourth radiating arm, one of the first radiating arm and the third radiating arm is electrically connected to the second feed-in portion, and the other one of the first radiating arm and the third radiating arm is electrically connected to the third grounding portion.
10. The antenna structure of claim 5, characterized in that: the radiator comprises a first radiation arm, a second radiation arm, a fourth radiation arm, a fifth radiation arm and a sixth radiation arm, one end of the first radiation arm is electrically connected to the second feed-in portion, one end of the second radiation arm is electrically connected to the middle position of one side of the first radiation arm perpendicularly, one end of the fourth radiation arm is connected to one end, far away from the first radiation arm, of the second radiation arm perpendicularly and extends in a direction parallel to the first radiation arm, one end of the fifth radiation arm is connected to one end, far away from the second radiation arm, of the fourth radiation arm perpendicularly and extends in a direction parallel to the second radiation arm, and the sixth radiation arm is arc-shaped and connected to one end, far away from the fourth radiation arm, of the fifth radiation arm.
11. The antenna structure of claim 1, characterized in that: the antenna structure further comprises a first switching circuit, wherein the first switching circuit comprises a first switching unit and at least one first switching element, the first switching unit is electrically connected to the first grounding part, the at least one first switching element is connected in parallel, one end of each first switching element is electrically connected to the first switching unit, the other end of each first switching element is electrically connected to the grounding surface, and the first radiating part is switched to different first switching elements by controlling the switching of the first switching unit, so that the frequency band of the first radiating part is adjusted.
12. The antenna structure of claim 1, characterized in that: the antenna structure further comprises a second switching circuit, wherein the second switching circuit comprises a second switching unit and at least one second switching element, the second switching unit is electrically connected to the second grounding part, the at least one second switching element is connected in parallel, one end of the at least one second switching element is electrically connected to the second switching unit, the other end of the at least one second switching element is electrically connected to the grounding surface, and the second radiation part is switched to different second switching elements by controlling the switching of the second switching unit, so that the frequency band of the second radiation part is adjusted.
13. The antenna structure of claim 1, characterized in that: the wireless communication device receives or transmits wireless signals in a plurality of different frequency bands simultaneously using the carrier aggregation technique and using the first portion.
14. The antenna structure of claim 1, characterized in that: the second part is grounded, when current enters from the first feed-in part, the current flows through the first radiation part and is grounded through the first grounding part, when current enters from the first feed-in part, the current also flows into the second radiation part and is grounded through the second grounding part, so that the first radiation part and the second radiation part jointly excite the first mode to generate a radiation signal of a first frequency band, when current enters from the second feed-in part, the current flows into the radiator and is coupled to the second part, so that the second part excites the second mode to generate a radiation signal of a second frequency band, and simultaneously, the current flowing into the radiator enables the radiator to work in a third mode to generate a radiation signal of a third frequency band.
15. The antenna structure of claim 14, characterized in that: the first mode is an LTE mode, the second mode is a GPS/GLONASS mode, and the third mode comprises a high-frequency band, a Bluetooth frequency band and a WIFI frequency band of the first mode.
16. The antenna structure of claim 1, characterized in that: the radiator comprises a first radiation section, a second radiation section, a third radiation section, a fourth radiation section and a fifth radiation section which are sequentially connected, one end of the first radiation section is electrically connected to the second feed-in part, one end of the second radiation section is vertically connected to one end, far away from the second feed-in part, of the first radiation section, one end of the third radiation section is vertically connected to one end, far away from the first radiation section, of the second radiation section, one end of the fourth radiation section is vertically connected to one end, far away from the second radiation section, of the third radiation section, the other end of the fourth radiation section extends in a direction parallel to the second radiation section, the fifth radiation section and the second radiation section form a U-shaped structure together, one end of the fifth radiation section is vertically connected to one end, far away from the third radiation section, of the fourth radiation section, and the other end of the fifth radiation section extends in a direction parallel to the third radiation section and close to the second radiation section, and the third radiation section and the fourth radiation section form a U-shaped structure together.
17. The antenna structure of claim 16, characterized in that: the second part is grounded, when current enters from the first feed-in part, the current flows into the first radiation part and is grounded through the first grounding part, when current enters from the first feed-in part, the current flows into the second radiation part and is grounded through the second grounding part, so that the first radiation part and the second radiation part jointly excite a first mode to generate a radiation signal of a first frequency band, when current is fed from the second feed-in part, the current flows into the radiator and is coupled to the second part, so that the second part excites the second mode to generate a radiation signal of a second frequency band, and simultaneously, the current flowing through the radiator enables the radiator to work in a third mode to generate a radiation signal of a third frequency band.
18. The antenna structure of claim 17, characterized in that: the first mode is an LTE mode, the second mode is a GPS/GLONASS mode, and the third mode comprises a high-frequency band, a Bluetooth frequency band and a WIFI frequency band of the first mode.
19. The antenna structure of claim 18, characterized in that: the second feed-in part comprises a duplexer and a signal extractor, two output ends of the duplexer are used for realizing the function of sharing the signal output/input path between the Wi-Fi 2.4GHz signal and the LTE high-frequency signal, and the signal extractor is used for providing the function of sharing the signal output/input path between the GPS/GLONASS signal and the non-GPS/GLONASS signal.
20. The antenna structure of claim 18, characterized in that: the second feed-in part comprises a triplexer for realizing the function of sharing the input/output paths of the GPS/GLONASS signals and the non-GPS/GLONASS signals.
21. A wireless communication device comprising an antenna structure as claimed in any one of claims 1 to 20.
CN201710482507.9A 2016-07-21 2017-06-22 Antenna structure and wireless communication device with same Active CN107645040B (en)

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TW201804661A (en) 2018-02-01
TWI640125B (en) 2018-11-01

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