CN107645055B - Antenna system and mobile terminal - Google Patents
Antenna system and mobile terminal Download PDFInfo
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- CN107645055B CN107645055B CN201710751497.4A CN201710751497A CN107645055B CN 107645055 B CN107645055 B CN 107645055B CN 201710751497 A CN201710751497 A CN 201710751497A CN 107645055 B CN107645055 B CN 107645055B
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Abstract
The invention provides an antenna system and a mobile terminal, wherein a resonant arm is separated from a metal shell of the mobile terminal, the antenna system comprises the resonant arm, a first tuning circuit, a second tuning circuit, a first feed circuit and a second feed circuit which are arranged between the resonant arm and a grounding end, the resonant arm is formed by arranging a slit on the metal shell in a separating way, the feed circuit and the tuning circuit connected with the feed circuit are arranged on the resonant arm, the other tuning circuit is arranged at the tail end of the resonant arm, and the switching of a radiation mode is realized at the feed end of the resonant arm and the tail end of the resonant arm by utilizing the switch combination of the tuning circuits, so that the single antenna can realize the coverage of medium and high frequency band bandwidth in a small clearance environment, and the antenna efficiency and the bandwidth requirements of the frequency band in the mobile terminal are met.
Description
Technical Field
The invention relates to the technical field of antennas, in particular to an antenna system and a mobile terminal.
Background
With the development and progress of science and technology, the communication technology has been developed rapidly and greatly, and with the improvement of the communication technology, the popularization of intelligent electronic products has been improved to an unprecedented level, and more intelligent terminals or mobile terminals become an indispensable part of the life of people, such as smart phones, smart televisions, computers and the like.
While the mobile terminal is popularized, the requirements of users on the types and performances of the functions of the mobile terminal are higher and higher, and for example, an audio function, a photographing function, a camera shooting function, a quick charging function and the like become necessary functions of an intelligent terminal or the mobile terminal.
As the functions of the mobile terminal are more and more improved, the appearance and the texture of the mobile terminal become the pursuit of users, and the mobile terminal with a metal shell is more and more favored by users due to the excellent metal texture. However, under the requirements of enhancement of the metal texture requirement of the mobile terminal housing and the requirement that the clearance area of the antenna resonating arm is smaller and smaller, the Q value of the antenna is increased, and the bandwidth is narrowed, so that one antenna is difficult to realize broadband frequency band coverage of multiple frequency bands, especially broadband coverage of medium frequency and high frequency of 1710M-2690M, and the requirements of antenna efficiency and bandwidth of the frequency bands in the mobile terminal are difficult to meet.
Disclosure of Invention
The embodiment of the invention provides an antenna system and a mobile terminal, and aims to solve the problems that one antenna is difficult to realize multi-band broadband frequency band coverage and difficult to meet the antenna efficiency and frequency band bandwidth requirements in the mobile terminal under the condition of meeting the requirements of the metal texture of a shell of the mobile terminal and the small clearance area of a resonating arm of the antenna in the conventional mobile terminal.
The embodiment of the invention provides an antenna system which is applied to a mobile terminal with a metal shell, wherein a gap is arranged on the metal shell, a resonant arm is formed on the metal shell in a separated mode through the gap, the antenna system comprises the resonant arm, a first feed circuit, a second feed circuit, a first tuning circuit and a second tuning circuit, the first feed circuit and the second feed circuit are connected between a first connecting point and a grounding end of the resonant arm, the first connecting point is positioned in the middle position of the resonant arm, the first tuning circuit is connected with the first feed circuit in parallel, the second tuning circuit is connected between the tail end of the resonant arm and the grounding end, when the antenna system is in a medium-frequency radiation mode, the first tuning circuit and the first feed circuit are both open-circuited, and the second feed circuit and the second tuning circuit are both on, when the antenna system is in a high-frequency radiation mode, the first feed circuit, the first tuning circuit and the second tuning circuit are all conducted, and the second feed circuit is disconnected.
The embodiment of the invention also provides a mobile terminal, which comprises an antenna system and a metal shell, wherein a gap is arranged on the metal shell, a resonant arm is formed on the metal shell in a separated manner through the gap, the antenna system comprises the resonant arm, a first feed circuit, a second feed circuit, a first tuning circuit and a second tuning circuit, the first feed circuit and the second feed circuit are connected between a first connecting point and a grounding end of the resonant arm, the first connecting point is positioned in the middle of the resonant arm, the first tuning circuit is connected with the first feed circuit in parallel, the second tuning circuit is connected between the tail end of the resonant arm and the grounding end, when the antenna system is in a medium-frequency radiation mode, the first tuning circuit and the first feed circuit are both open-circuited, and the second feed circuit and the second tuning circuit are both on, when the antenna system is in a high-frequency radiation mode, the first feed circuit, the first tuning circuit and the second tuning circuit are all conducted, and the second feed circuit is disconnected.
The antenna system and the mobile terminal provided by the embodiment of the invention separate the resonant arm on the metal shell of the mobile terminal, the antenna system comprises the resonant arm, and a first tuning circuit, a second tuning circuit, a first feed circuit and a second feed circuit which are arranged between the resonant arm and the grounding end, when the antenna system is in a medium-frequency radiation mode, the first tuning circuit and the first feed circuit are both broken, the second feed circuit and the second tuning circuit are both conducted, when the antenna system is in a high-frequency radiation mode, the first feed circuit, the first tuning circuit and the second tuning circuit are all conducted, the second feed circuit is broken, thus, the resonant arm is formed by arranging a slit on the metal shell in a separating way, the feed circuit and the tuning circuit connected with the feed circuit are arranged on the resonant arm, and the other tuning circuit is arranged at the tail end of the resonant arm, the switching of the radiation mode is realized at the feed end of the resonance arm and the tail end of the resonance arm by utilizing the switch combination of the tuning circuit, so that the single antenna can realize the coverage of medium-high frequency band bandwidth in a small headroom environment, and the antenna efficiency and the bandwidth requirement of the frequency band in the mobile terminal are met.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a perspective view of a mobile terminal according to an embodiment of the present invention;
fig. 2 is a plan view of a metal case of the mobile terminal shown in fig. 1;
fig. 3 is a schematic structural diagram of an antenna system of the mobile terminal shown in fig. 1;
fig. 4 is a schematic structural diagram of an antenna system of a mobile terminal according to another embodiment of the present invention.
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 some, not all, embodiments of the present invention. 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.
Referring to fig. 1, as shown in fig. 2 and fig. 3, fig. 1 is a perspective view of a mobile terminal according to an embodiment of the present invention, fig. 2 is a plan view of a metal housing of the mobile terminal shown in fig. 1, and fig. 3 is a schematic structural diagram of an antenna system of the mobile terminal shown in fig. 1. As shown in fig. 1 to fig. 3, a mobile terminal 100 according to an embodiment of the present invention includes a display screen 11, a middle frame 12 and a metal housing 13, where the display screen 11 and the metal housing 13 are nested in the middle frame 12, the middle frame 12 bears the display screen 11 and the metal housing 13, and forms an accommodating cavity together with the display screen 11 and the metal housing 13, and a main board and other components of the mobile terminal are accommodated in the accommodating cavity. The mobile terminal 100 further includes a display area 101 and a peripheral area 102 surrounding the display area 101, where the display area 101 is used for implementing a display function, a touch function, and the like of the mobile terminal 100.
In this embodiment, the metal case is taken as an example of the rear case of the mobile terminal, but the present invention is not limited to this, and in other embodiments, the metal case may be a middle frame of the mobile terminal or another member using a metal structure, and is not limited to this.
In this embodiment, the middle frame and the rear metal rear case are provided as the case of the mobile terminal, but the present invention is not limited to this, and in another embodiment, only a case made of a metal case may be provided as the case of the mobile terminal without providing the middle frame.
As shown in fig. 2, a gap 131 is disposed on the metal housing 13, the gap 131 is located at one end of the metal housing 13 and is close to a right edge of the metal housing 13, the gap 131 separates the metal housing 13 into a resonant arm 132 and a body 133 of the metal housing 13, the resonant arm 132 is located at one end of the metal housing 13 and is located at most of the right edge of the metal housing 13, one end of the resonant arm 132 is connected to the body 133 of the metal housing 13, the other end is a terminal end of the resonant arm 132, and the terminal end of the resonant arm 132 is opposite to the body 133.
In this embodiment, the resonant arm 132 has a substantially L-shape, but the present invention is not limited thereto, and in other embodiments, the resonant arm 132 may have a linear shape or other shapes.
In this embodiment, the slot 131 and the resonant arm 132 are located at one end of the metal shell 13 and near the right edge of the metal shell 13, but the present invention is not limited thereto, and in other embodiments, the slot 131 and the resonant arm 132 may be located near the left edge of the metal shell 13, or near the top or bottom edge of the metal shell 13.
As shown in fig. 3, the mobile terminal 100 further includes an antenna system 14, and the antenna system 14 includes the resonant arm 132, a first feed circuit 141, a second feed circuit 142, a first tuning circuit 143, and a second tuning circuit 144. The first feed circuit 141 and the second feed circuit 142 are connected between the first connection point of the resonant arm 132 and the ground terminal, the first feed circuit 141 and the second feed circuit 142 are arranged in parallel, the first tuning circuit 143 and the first feed circuit 141 are arranged in parallel, the first tuning circuit 143 is connected between the first connection point of the resonant arm 132 and the ground terminal, and the second tuning circuit 144 is connected between the tail end of the resonant arm 132 and the ground terminal.
Wherein the first connection point may be located at a middle position of the resonator arm 132, or substantially at a middle position of the resonator arm 132.
When the antenna system 14 is in the intermediate frequency radiation mode, the first tuning circuit 143 and the first feed circuit 141 are both in an open circuit state, the second feed circuit 142 is in a conductive state, and the second tuning circuit 144 is in a first conductive state, and when the antenna system 14 is in the high frequency radiation mode, the first feed circuit 141 and the first tuning circuit 143 are in a conductive state, the second tuning circuit 144 is in a second conductive state, and the second feed circuit 142 is in an open circuit state.
Specifically, the first feed circuit 141 includes a first feed 1411 and a first feed matching circuit 1412 connected to the first feed 1411, and two ends of the first feed matching circuit 1412 are respectively connected between the first feed 1411 and the first connection point. The second feed circuit 142 includes a second feed 1421 and a second feed matching circuit 1422 connected to the second feed 1421, and two ends of the second feed matching circuit 1422 are respectively connected between the second feed 1421 and the first connection point.
In this embodiment, the first feed 1411 and the second feed 1421 are the same feed, but the present invention is not limited thereto, and in other embodiments, the first feed 1411 and the second feed 1421 may also be different feeds.
One end of the first tuning circuit 143 is connected between the first feed matching circuit 1412 and the first connection point, and the other end is connected to the ground. The first tuning circuit 143 includes a first tuning matching circuit 1431 and a first tuning switch 1432 connected to the first tuning matching circuit 1431, and the first tuning switch 1432 is connected between the first tuning matching circuit 1431 and a ground terminal.
The second tuning circuit 144 includes a second tuning matching circuit 1441 and a second tuning switch 1442 connected to the second tuning matching circuit 1441, and the second tuning switch 1442 is connected between the second tuning matching circuit 1441 and the end of the resonant arm 132.
Wherein, the second tuning matching circuit 1441 may include at least two branches, and the capacitance, the inductance, or the collocation between the capacitance and the inductance in each branch is different, some lines in the at least two branches may be directly connected to the second connection point, the second tuning circuit 144 may switch the conducting state of the second tuning circuit 144 by closing or opening the second tuning switch 1442, for example, the second tuning switch 1442 may be a single-pole single-throw switch, and the second tuning circuit 144 may be controlled to switch between at least a first conducting state or a second conducting state by closing or opening the second tuning switch, or the second tuning matching circuit 1441 may include at least two branches, and the capacitance, the inductance, or the collocation between the capacitance and the inductance in each branch is different, and the second tuning circuit 144 may also be controlled to switch between different conducting states by the second tuning switch 1442, for example, the second tuning switch 1442 may be a single-pole double-throw switch, and the second tuning circuit 144 may be controlled to switch between at least a first conducting state or a second conducting state by conducting states between different conducting points. The second tuning switch 1442 may be a single-pole single-throw switch, a single-pole double-throw switch, or another switch that can switch the second tuning circuit 144 between different conduction states.
The first feed matching circuit 1412, the second feed matching circuit 1422, the first tuning matching circuit 1431, and the second tuning matching circuit 1441 may be inductors, capacitors, or complex matching formed by inductors and capacitors.
In this embodiment, the ground terminal may be a ground terminal disposed on a main board of the mobile terminal, and each tuning switch and each radio frequency circuit may also be disposed on the main board of the mobile terminal.
Further, the antenna system 14 includes a first switch 145, the first switch 145 is connected between the first feed matching circuit 1412 and the first connection point, and the first switch 145 is also connected between the second feed matching circuit 1422 and the first connection point. The first switch 145 includes a first terminal connected to a first feed matching circuit 1412, the first terminal is further connected to the first tuning matching circuit 1431, the second terminal is connected to the second feed matching circuit 1422, and the control terminal is connected to the first connection point.
In this embodiment, the first switch 145 is a single-pole double-throw switch.
When the antenna system 14 is in the intermediate frequency radiation mode, the first terminal and the control terminal are disconnected, so that the first feed circuit 141 is in an open state, the first tuning switch 1432 is disconnected, so that the first tuning circuit 143 is in an open state, the second terminal and the control terminal are connected, and the second tuning switch 1442 is connected, so that the second feed circuit 142 and the second tuning circuit 144 are both in a connected state. At this time, the antenna system 14 may implement the intermediate frequency radiation function of the antenna system 14 through different values of the inductor, the capacitor, or the inductor and the capacitor in the second feed matching circuit 1422 and the second tuning matching circuit 1441.
When the antenna system 14 is in the high-frequency radiation mode, the first terminal and the control terminal are turned on, so that the first feed circuit 141 is in the on state, the first tuning switch 1432 is turned on, so that the first tuning circuit 143 is in the on state, the second tuning switch 1442 is turned on, so that the second tuning circuit 144 is in the on state, and the second terminal and the control terminal are turned off, so that the second feed circuit 142 is in the off state. At this time, the antenna system 14 may implement the high-frequency radiation function of the antenna system 14 by matching different values of the inductance, the capacitance, or the inductance and the capacitance in the first feed matching circuit 1412, the first tuning matching circuit 1431, and the second tuning matching circuit 1441.
In this embodiment, in the matching circuit of any branch, the switch and its accessory matching circuit can be interchanged to generate the same function, for example, in the first tuning circuit 143, the first tuning matching circuit 1431 may be located between the first tuning switch 1432 and the ground, and the first tuning matching circuit 1431 may be connected between the first terminal and the first connection point.
In this embodiment, the mobile terminal 100 can adjust the frequency band of the antenna system 14 of the mobile terminal 100 and the width of the frequency band bandwidth by adjusting the combination of the on and off of the first switch 145, the first tuning switch 1432 and the second tuning switch 1442, so that the antenna of the mobile terminal 100 can meet the requirement of metal texture of the housing and the requirement of small headroom for the antenna, and the coverage of the medium-high frequency band bandwidth can be realized by a single antenna.
In the embodiment of the present invention, the mobile terminal may be any of: a Mobile terminal having at least communication, GPS and wireless connection functions, such as a Mobile phone, a Tablet Personal Computer (Tablet Personal Computer), a Laptop Computer (Laptop Computer), a Personal Digital Assistant (PDA), a Mobile Internet Device (MID) or a Wearable Device (Wearable Device).
Referring to fig. 4, fig. 4 is a schematic structural diagram of an antenna system of a mobile terminal according to another embodiment of the present invention. As shown in fig. 4, the embodiment shown in fig. 4 differs from the embodiment shown in fig. 3 in that: the antenna system 24 includes a second switch 246 and a third switch 247, the second switch 246 is connected between the first feed matching circuit 2412 and the first connection point, the first tuning matching circuit 2431 is connected between the first feed matching circuit 2412 and the second switch 246, and the third switch 247 is connected between the second feed matching circuit 2422 and the first connection point.
When the antenna system 24 is in the if radiation mode, the second switch 246 is open, such that the first feed circuit 241 is in the open state, the first tuning switch 2432 is open, such that the first tuning circuit 243 is in the open state, and the third switch 247 is conductive, such that the second feed circuit 242 is in the conductive state, and the second tuning circuit 244 is in the first conductive state. At this time, the antenna system 24 may implement the intermediate frequency radiation function of the antenna system 24 through different values of the inductor, the capacitor, or the inductor and the capacitor in the second feed matching circuit 2422 and the second tuning matching circuit 2441.
When the antenna system 24 is in the high frequency radiation mode, the second switch 246 is turned on, so that the first feed circuit 241 is in a conducting state, the first tuning switch 2432 is turned on, so that the first tuning circuit 243 is in a conducting state, the second tuning circuit 244 is in a second conducting state, and the third switch 247 is turned off, so that the second feed circuit 242 is in an off state. At this time, the antenna system 24 may implement the high-frequency radiation function of the antenna system 14 through different values of the inductor, the capacitor, or the inductor and the capacitor in the first feed matching circuit 2412, the first tuning matching circuit 2431, and the second tuning matching circuit 2441.
The antenna system and the mobile terminal provided by the embodiment of the invention separate the resonant arm on the metal shell of the mobile terminal, the antenna system comprises the resonant arm, and a first tuning circuit, a second tuning circuit, a first feed circuit and a second feed circuit which are arranged between the resonant arm and the grounding end, when the antenna system is in a medium-frequency radiation mode, the first tuning circuit and the first feed circuit are both broken, the second feed circuit and the second tuning circuit are both conducted, when the antenna system is in a high-frequency radiation mode, the first feed circuit, the first tuning circuit and the second tuning circuit are all conducted, the second feed circuit is broken, thus, the resonant arm is formed by arranging a slit on the metal shell in a separating way, the feed circuit and the tuning circuit connected with the feed circuit are arranged on the resonant arm, and the other tuning circuit is arranged at the tail end of the resonant arm, the switching of the radiation mode is realized at the feed end of the resonance arm and the tail end of the resonance arm by utilizing the switch combination of the tuning circuit, so that the single antenna can realize the coverage of medium-high frequency band bandwidth in a small headroom environment, and the antenna efficiency and the bandwidth requirement of the frequency band in the mobile terminal are met.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. An antenna system is applied to a mobile terminal with a metal shell and is characterized in that a gap is arranged on the metal shell, a resonant arm is formed on the metal shell in a separated mode through the gap, the antenna system comprises the resonant arm, a first feed source circuit, a second feed source circuit, a first tuning circuit and a second tuning circuit, the first feed source circuit and the second feed source circuit are connected between a first connecting point and a grounding end of the resonant arm, the first connecting point is located in the middle of the resonant arm, the first tuning circuit is connected with the first feed source circuit in parallel, and the second tuning circuit is connected between the tail end and the grounding end of the resonant arm;
the first feed source circuit and the second feed source circuit share the same feed source or respectively use different feed sources;
when the antenna system is in a high-frequency radiation mode, the first feed circuit and the first tuning circuit are both conducted, the second tuning circuit is conducted and in a second conduction state, and the second feed circuit is disconnected.
2. The antenna system of claim 1, wherein the first feed circuit comprises a first feed and a first feed matching circuit connected to the first feed, wherein the second feed circuit comprises a second feed and a second feed matching circuit connected to the second feed, and wherein the first feed and the second feed are the same feed.
3. The antenna system of claim 2, wherein the antenna system comprises a first switch, the first switch comprising a control terminal, a first terminal, and a second terminal, the first terminal coupled to the first feed matching circuit, the second terminal coupled to the second feed matching circuit, the first connection point coupled to the control terminal.
4. The antenna system of claim 3, wherein the second terminal is in communication with the control terminal when the antenna system is in the medium frequency radiation mode, and wherein the first terminal is in communication with the control terminal when the antenna system is in the high frequency radiation mode.
5. The antenna system of claim 2, wherein the antenna system comprises a second switch connected between the first feed matching circuit and the first connection point, and a third switch connected between the second feed matching circuit and the first connection point.
6. The antenna system of claim 5, wherein the second switch is open and the third switch is closed when the antenna system is in a medium frequency radiation mode, and wherein the second switch is closed and the third switch is open when the antenna is in a high frequency radiation mode.
7. The antenna system of claim 2, wherein one end of the first tuning circuit is connected between the first feed matching circuit and the first connection point.
8. The antenna system of claim 1, wherein the first tuning circuit comprises a first tuning matching circuit and a first tuning switch coupled to the first tuning matching circuit, the first tuning switch being open when the antenna system is in the medium frequency radiation mode and being open when the antenna system is in the high frequency radiation mode.
9. The antenna system of claim 1, wherein one end of the resonating arm is connected to the body of the metal housing and the other end is a distal end of the resonating arm and is disposed opposite the body of the metal housing.
10. A mobile terminal, characterized in that the mobile terminal comprises an antenna system according to any of claims 1-9.
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| CN201710751497.4A CN107645055B (en) | 2017-08-28 | 2017-08-28 | Antenna system and mobile terminal |
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| CN201710751497.4A CN107645055B (en) | 2017-08-28 | 2017-08-28 | Antenna system and mobile terminal |
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| CN110323546B (en) * | 2018-03-31 | 2021-06-01 | Oppo广东移动通信有限公司 | Electronic device and control method thereof |
| CN110323537B (en) * | 2018-03-31 | 2021-06-01 | Oppo广东移动通信有限公司 | Electronic device and control method thereof |
| CN108767450B (en) * | 2018-06-25 | 2021-06-22 | 维沃移动通信有限公司 | Antenna system and terminal |
| CN108879116B (en) * | 2018-06-25 | 2021-06-18 | 维沃移动通信有限公司 | Antenna system and terminal |
| CN109346831A (en) * | 2018-09-30 | 2019-02-15 | 维沃移动通信有限公司 | A kind of antenna system and terminal |
| CN112086746A (en) * | 2020-09-04 | 2020-12-15 | Tcl通讯（宁波）有限公司 | Structure and method for expanding antenna bandwidth and mobile terminal |
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