CN109841944B - Antenna and terminal - Google Patents
Antenna and terminal Download PDFInfo
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- CN109841944B CN109841944B CN201910234655.8A CN201910234655A CN109841944B CN 109841944 B CN109841944 B CN 109841944B CN 201910234655 A CN201910234655 A CN 201910234655A CN 109841944 B CN109841944 B CN 109841944B
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Abstract
The invention provides an antenna and a terminal. The antenna includes: the antenna comprises an antenna body, a feed network and a ground plate; the antenna body is connected with the grounding plate through the feed network; the ground plate is provided with an opening for exciting a radiation mode of the ground plate so that the antenna body is coupled with the ground plate. According to the embodiment of the invention, because the radiation modes of the antenna body and the antenna ground are simultaneously excited, the bandwidth is improved.
Description
Technical Field
The invention relates to the technical field of antennas, in particular to an antenna and a terminal.
Background
At present, the pursuit of an ultra-thin appearance and a higher screen ratio is a current trend in the design of mobile terminals such as smart phones. In this trend, more and more devices are placed in the antenna area in the terminal, and the environment of the antenna is more and more severe. In a limited space environment, the design of a broadband antenna becomes difficult, especially at low frequencies, because the antenna requires more space, but this runs counter to the mainstream design.
At present, mobile terminal manufacturers mainly increase the bandwidth by changing basic factors influencing the bandwidth of the antenna in the aspect of solving the problem of the bandwidth of the antenna. For a built-in antenna, the main factors affecting the bandwidth are the height of the antenna support, the relative dielectric constant of the dielectric substrate, the length and width of the antenna radiation unit, and the like. For example, the larger the antenna mount height, the greater the bandwidth of the antenna. The width of the antenna radiation unit is increased, and the bandwidth is increased within a certain range. But this is limited by the limited volume of the mobile terminal and the adjustment space.
Therefore, it is desirable for those skilled in the art to realize an antenna capable of increasing a low frequency bandwidth in a limited space.
Disclosure of Invention
The invention provides an antenna and a terminal, which are used for increasing the low-frequency bandwidth of the antenna.
In a first aspect, the present invention provides an antenna comprising:
the antenna comprises an antenna body, a feed network and a ground plate;
the antenna body is connected with the grounding plate through the feed network;
the ground plate is provided with an opening for exciting a radiation mode of the ground plate so that the antenna body is coupled with the ground plate.
In a possible implementation manner of the present invention, the ground plate has a short side and a long side which are adjacent to each other, the antenna body is located at the short side of the ground plate, and the opening is located at the long side of the ground plate.
In a possible implementation manner of the present invention, the ground plate has two symmetrical long sides, and the two long sides are symmetrically provided with the opening.
In a possible implementation manner of the invention, the shape of the ground plate is rectangular, and the sum of the lengths of the two openings is smaller than the length of the short side of the ground plate.
In a possible implementation of the invention, the distance between two of said openings is smaller than the width of said opening; the width of the opening is the length along the direction of the long edge.
In one possible implementation of the present invention, the opening is located at one end of the long side near the antenna body side.
In one possible implementation of the invention, the opening is a rectangular opening or an annular opening.
In a possible implementation manner of the present invention, the antenna body is a monopole antenna.
In a second aspect, the present invention provides a terminal, comprising:
an antenna as claimed in any one of the first aspect, and a housing;
wherein the antenna is disposed in the housing.
The antenna and the terminal provided by the embodiment of the invention comprise: the antenna comprises an antenna body, a feed network and a ground plate; the antenna body is connected with the grounding plate through the feed network; the ground plate is provided with an opening for exciting the radiation mode of the ground plate, so that the antenna body is coupled with the ground plate, and the radiation modes of the antenna body and the antenna ground are excited simultaneously, so that energy is fully coupled to the ground from the antenna, the effective radiation area is increased, and the bandwidth is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
Fig. 1 is a schematic diagram of an antenna within a terminal;
FIG. 2 is a schematic diagram of a simulation of MS as a function of frequency for the antenna of FIG. 1;
fig. 3 is a schematic structural diagram of an embodiment of an antenna provided in the present invention;
FIG. 4A is a schematic view of the current distribution of the antenna of FIG. 1;
FIG. 4B is a schematic view of the current distribution of the antenna shown in FIG. 3;
FIG. 5 is a schematic diagram illustrating a comparison of transmission coefficients of an antenna according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a Smith comparison of an antenna according to an embodiment of the invention;
FIG. 7 is a schematic diagram illustrating a comparison of different modes of an embodiment of the antenna provided by the present invention;
fig. 8A is a first schematic view illustrating current distribution of an embodiment of the antenna provided by the present invention;
fig. 8B is a second schematic diagram of current distribution of an embodiment of the antenna provided by the present invention;
fig. 9 is a block diagram of an exemplary embodiment of a mobile terminal provided by the present invention.
Description of reference numerals:
1. an antenna body; 2. A ground plate;
3. a feed network; a. An antenna;
B. an antenna; 10. An antenna body;
20. a ground plate; 30. A feed network;
21. an opening; 31. And (4) feeding points.
With the foregoing drawings in mind, certain embodiments of the disclosure have been shown and described in more detail below. These drawings and written description are not intended to limit the scope of the disclosed concepts in any way, but rather to illustrate the concepts of the disclosure to those skilled in the art by reference to specific embodiments.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.
The terms "comprising" and "having," and any variations thereof, in the description and claims of this invention and the drawings described herein are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral part; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Firstly, the application scene related to the invention is introduced:
the antenna provided by the embodiment of the invention is applied to a terminal so as to improve the low-frequency bandwidth of the antenna.
The terminal in the embodiment of the present invention may include but is not limited to: mobile terminals such as mobile phones, tablet computers, wearable devices, and internet of things devices.
The performance of the antenna in the mobile terminal depends on the antenna body, and is also influenced by the antenna ground formed by the main board of the mobile terminal where the antenna is located, the display screen metal reinforcing plate and the like.
As shown in fig. 1, the in-terminal antenna generally comprises an antenna body 1, a feeding network 3 and a ground plate 2. The size and the resonant frequency of the grounding plate can influence the bandwidth of the antenna, and the influence of the grounding plate on the bandwidth of the antenna is analyzed by performing characteristic mode simulation on the grounding plate. For example, a rectangular metal plate with a ground plane of 150mm x 70mm size, the thickness of which has a negligible effect on the antenna performance, is set as a two-dimensional plane for simulation convenience, as shown in fig. 1. The mode parameters of the metal grounding plate are calculated by using electromagnetic simulation software CST Studio Suit. A graph of the mode weight coefficient (MS) versus frequency for the first three modes (mode 1, mode 2, and mode 3) is obtained, as shown in fig. 2. When the MS is equal to 1 at a certain frequency, the mode is resonant at the frequency; if the MS value is
Corresponding high and low frequencies of fh、flThen the mode bandwidth is fh-flIt characterizes the bandwidth potential of the ground plane. As can be seen from fig. 2, only mode 1 is dominant mode and the resonance is near 880MHz at low frequency, having a broadband characteristic, and the other modes 2 and 3 are larger than MS value
The time frequency is large. If multiple modes are merged in a certain frequency band, the bandwidth is increased.
Therefore, the antenna of the embodiment of the invention can expand the low-frequency bandwidth by exciting the radiation mode of the antenna ground at the low frequency and by coupling the antenna body with the radiation mode of the antenna ground.
The technical solution of the present invention will be described in detail below with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
Fig. 3 is a schematic structural diagram of an embodiment of an antenna provided in the present invention. As shown in fig. 3, the antenna B provided in this embodiment includes:
an antenna body 10, a feed network 30 and a ground plate 20;
wherein, the antenna body 10 is connected with the ground plate 20 through the feed network 30;
the ground plate 20 is provided with an opening 21 for exciting a radiation pattern of the ground plate 20 such that the antenna body 10 is coupled with the ground plate 20.
Specifically, as shown in fig. 3, in order to excite the radiation mode of the ground plate, an opening 21 is provided on the ground plate 20 so that the antenna body 10 and the ground plate 20 are sufficiently coupled.
The low-frequency condition of the antenna is analyzed through simulation results, and the antenna body is assumed to be a monopole antenna (named as antenna a), and the structure of the antenna body is shown in fig. 1. The antenna a is a T-shaped monopole antenna, the two arms are low frequency, the current distribution is as shown in fig. 4A, capacitive coupling feeding is adopted, the feed point 31 is placed at the position of the maximum electric field, and the region of the maximum electric field is as the region a in fig. 4A. The smith charts of the reflection coefficient and impedance were calculated using the electromagnetic simulation software Altair FEKO and are shown in fig. 5 and 6. As can be seen from fig. 4A, the current distribution of the antenna a is concentrated near the feeding network, and fig. 5 and 6 show that the bandwidth of the antenna a does not exhibit a broadband characteristic because the radiation mode of the antenna itself is dominant and is not sufficiently coupled. In order to increase the bandwidth, an opening 21, such as a rectangular slot in fig. 3, is provided on the ground plate in the embodiment of the present invention, and the size is 34mm × 7mm, for example.
In the embodiment of the present invention, the sizes of the grounding plate and the opening may also be other values, which is not limited herein.
From the circuit point of view, the slot is equivalent to parallel LC resonance, when the antenna radiation mode and the radiation mode of the grounding plate are excited simultaneously, double resonance appears, as shown in fig. 5 and fig. 6, the antenna bandwidth of the antenna B is increased, a new resonance circle (a small circle of a solid line in fig. 6) also appears on the Smith chart, and the bandwidth covers 590 MHz-980 MHz. In order to essentially analyze the operation mechanism of the antenna B, characteristic mode analysis was performed thereon. From the Mode Weighting Coefficients (MWC) in fig. 7, the dominant modes are mode 1 and mode 2 at low frequency, and the bandwidth will increase because two modes are in operation. Mode 2 resonance is around 907MHz, and the current distribution as shown in fig. 8B appears as a radiation mode of the antenna body; mode 1 resonance is around 615MHz, and the current distribution of mode 1 as shown in fig. 8A is mainly the coupling state of the ground plane and the antenna body. From the current distribution shown in fig. 4B, the region a and the region B are regions with the largest electric field, and from the current distribution shown in fig. 8A, the region c is a region with the largest electric field, and energy is sufficiently coupled from the antenna to the ground, so that the effective radiation area is increased, and the bandwidth is improved.
The antenna of the embodiment comprises an antenna body, a feed network and a ground plate; the antenna body is connected with the grounding plate through the feed network; the ground plate is provided with an opening for exciting the radiation mode of the ground plate, so that the antenna body is coupled with the ground plate, and the radiation modes of the antenna body and the antenna ground are excited simultaneously, so that energy is fully coupled to the ground from the antenna, the effective radiation area is increased, and the bandwidth is improved.
On the basis of the above embodiment, as shown in fig. 3, the ground plate has adjacent short sides and long sides, the antenna body 10 is located at the short side of the ground plate 20, and the opening is located at the long side of the ground plate.
Further, as shown in fig. 3, the ground plate has two symmetrical long sides, and the two long sides are symmetrically provided with the openings.
In some embodiments of the present invention, the number and the position of the openings may be determined according to actual conditions, and the embodiments of the present invention are not limited thereto.
Further, the shape of the grounding plate is rectangular, and the sum of the lengths of the two openings is smaller than the length of the short side of the grounding plate.
Specifically, the grounding plate in fig. 3 is illustrated as a rectangle, and the grounding plate may have other shapes in other embodiments of the present invention, which is not limited in the present invention.
In fig. 3, two openings are symmetrically provided. The shape of the opening is a rectangular opening or an annular opening, which is not limited in the embodiment of the present invention.
The two symmetrical openings are equivalent to parallel LC resonant circuits, so that the grounding plate generates resonance, the antenna body is coupled with the ground, the effective radiation area is increased, and the bandwidth of the antenna is improved.
As shown in fig. 3, the two openings are connected by an intermediate ground plate portion.
In some embodiments of the invention, the distance between two of the openings is less than the width of the openings; the width of the opening is the length along the direction of the long edge.
For example, the length of the ground plate portion in the middle of the two openings in fig. 3 in the long side direction is larger than that in the short side direction.
In some embodiments of the present invention, the size of the opening may be determined according to practical situations, and the embodiment of the present invention is not limited thereto.
In some embodiments of the invention, the opening is located near one end of the long side of the antenna body side.
The opening of the grounding plate is close to one end of the long edge of the antenna body side, so that energy is fully coupled to the ground from the antenna body, the effective radiation area is increased, and the bandwidth of the antenna is improved.
In some embodiments of the present invention, the antenna body may be a monopole antenna, a dipole antenna, or another form of antenna, which is not limited by the embodiments of the present invention.
In the embodiment, the ground plate is provided with the opening for exciting the radiation mode of the ground plate, so that the antenna body is coupled with the ground plate, and because the radiation modes of the antenna body and the antenna ground are excited simultaneously, energy is fully coupled to the ground from the antenna, the effective radiation area is increased, and the bandwidth is improved.
In an embodiment of the present invention, a terminal is further provided, including:
an antenna as claimed in any preceding embodiment, and a housing;
wherein the antenna is disposed in the housing.
Further, the ground plate in the antenna is a main board of the terminal or a metal reinforcing plate of a display screen of the terminal.
In a possible implementation manner of the present invention, the ground plate has a short side and a long side which are adjacent to each other, the antenna body is located at the short side of the ground plate, and the opening is located at the long side of the ground plate.
In a possible implementation manner of the present invention, the ground plate has two symmetrical long sides, and the two long sides are symmetrically provided with the opening.
In a possible implementation manner of the invention, the shape of the ground plate is rectangular, and the sum of the lengths of the two openings is smaller than the length of the short side of the ground plate.
In a possible implementation of the invention, the distance between two of said openings is smaller than the width of said opening; the width of the opening is the length along the direction of the long edge.
In one possible implementation of the present invention, the opening is located at one end of the long side near the antenna body side.
In one possible implementation of the invention, the opening is a rectangular opening or an annular opening.
In a possible implementation manner of the present invention, the antenna body is a monopole antenna.
The implementation principle and technical effect of the terminal in this embodiment are similar to those of the foregoing embodiments, and are not described herein again.
The terminal of the embodiment comprises an antenna and a shell; wherein the antenna is disposed in the housing, the antenna comprising: the antenna comprises an antenna body, a feed network and a ground plate; the antenna body is connected with the grounding plate through the feed network; the ground plate is provided with an opening for exciting the radiation mode of the ground plate, so that the antenna body is coupled with the ground plate, and the radiation modes of the antenna body and the antenna ground are excited simultaneously, so that energy is fully coupled to the ground from the antenna, the effective radiation area is increased, and the bandwidth is improved.
Fig. 9 is a block diagram of an exemplary embodiment of a mobile terminal provided by the present invention. For example, the mobile terminal may be a smartphone, a computer, a tablet device, a wearable device, an internet of things device, and the like.
Referring to fig. 9, the mobile terminal may further include one or more of the following components: processing component 902, memory 904, power component 906, multimedia component 908, audio component 910, input/output (I/O) interface 912, sensor component 914, and communication component 916.
The processing component 902 generally controls overall operation of the mobile terminal, such as operations associated with display, telephone calls, data communications, camera operations, and recording operations. Processing component 902 may include one or more processors 920 to execute instructions to perform all or a portion of the steps of the methods described above. Further, processing component 902 can include one or more modules that facilitate interaction between processing component 902 and other components. For example, the processing component 902 can include a multimedia module to facilitate interaction between the multimedia component 908 and the processing component 902.
The memory 904 is configured to store various types of data to support operation of the mobile terminal. Examples of such data include instructions for any application or method operating on the mobile terminal, contact data, phonebook data, messages, pictures, videos, and the like. The memory 904 may be implemented by any type or combination of volatile or non-volatile memory devices such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disks.
The power component 906 provides power to the various components of the mobile terminal. The power components 906 may include a power management system, one or more power sources, and other components associated with generating, managing, and distributing power for the mobile terminal.
The multimedia component 908 comprises a screen providing an output interface between the mobile terminal and the user. In some embodiments, the screen may include a Liquid Crystal Display (LCD) and a Touch Panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive an input signal from a user. The touch panel includes one or more touch sensors to sense touch, slide, and gestures on the touch panel. The touch sensor may not only sense the boundary of a touch or slide action, but also detect the duration and pressure associated with the touch or slide operation.
In some embodiments, the multimedia component 908 includes a front facing camera and/or a rear facing camera. The front camera and/or the rear camera may receive external multimedia data when the mobile terminal is in an operation mode, such as a photographing mode or a video mode. Each front camera and rear camera may be a fixed optical lens system or have a focal length and optical zoom capability.
The audio component 910 is configured to output and/or input audio signals. For example, the audio component 910 includes a Microphone (MIC) configured to receive external audio signals when the mobile terminal is in an operating mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signals may further be stored in the memory 904 or transmitted via the communication component 916.
In some embodiments, audio component 910 also includes a speaker for outputting audio signals.
I/O interface 912 provides an interface between processing component 902 and peripheral interface modules, which may be keyboards, click wheels, buttons, etc. These buttons may include, but are not limited to: a home button, a volume button, a start button, and a lock button.
The sensor component 914 includes one or more sensors for providing various aspects of state assessment for the mobile terminal. For example, the sensor component 914 may detect an open/closed state of the mobile terminal, a relative positioning of components, such as a display and keypad of the mobile terminal, the sensor component 914 may also detect a change in position of the mobile terminal or a component of the mobile terminal, the presence or absence of user contact with the mobile terminal, orientation or acceleration/deceleration of the mobile terminal, and a change in temperature of the mobile terminal. The sensor assembly 914 may include a proximity sensor configured to detect the presence of a nearby object in the absence of any physical contact. The sensor assembly 914 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 914 may also include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.
The communication component 916 is configured to facilitate communications between the mobile terminal and other devices in a wired or wireless manner. The mobile terminal may access a wireless network based on a communication standard, such as WiFi, 2G, 3G, 4G, or 5G, or a combination thereof. In an exemplary embodiment, the communication component 916 receives a broadcast signal or broadcast associated information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 916 further includes a Near Field Communication (NFC) module to facilitate short-range communications. For example, the NFC module may be implemented based on Radio Frequency Identification (RFID) technology, infrared data association (IrDA) technology, Ultra Wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
Claims (8)
1. An antenna, comprising:
the antenna comprises an antenna body, a feed network and a ground plate;
the antenna body is connected with the grounding plate through the feed network;
the ground plate is provided with an opening for simultaneously exciting a radiation mode of the ground plate and a radiation mode of the antenna so that the antenna body is coupled with the ground plate;
the antenna body is positioned on the short side of the grounding plate, and the opening is positioned on the long side of the grounding plate;
the grounding plate is provided with two symmetrical long sides, the openings are symmetrically arranged on the two long sides, and the two symmetrical openings enable the grounding plate to generate resonance.
2. The antenna of claim 1, wherein the ground plane is rectangular in shape, and the sum of the lengths of the two openings is less than the length of the short side of the ground plane.
3. The antenna of claim 2,
the distance between the two openings is smaller than the width of the openings; the width of the opening is the length along the direction of the long edge.
4. The antenna according to any of claims 1-3,
the opening is located at one end of the long side near the antenna body side.
5. The antenna according to any of claims 1-3,
the opening is a rectangular opening or an annular opening.
6. An antenna according to any of claims 1-3, characterized in that the antenna body is a monopole antenna.
7. A terminal, comprising:
the antenna of any one of claims 1-6, and a housing;
wherein the antenna is disposed in the housing.
8. A terminal as claimed in claim 7, characterised in that the ground plane is a metal reinforcing plate of a main board of the terminal or of a display screen of the terminal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910234655.8A CN109841944B (en) | 2019-03-26 | 2019-03-26 | Antenna and terminal |
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| CN201910234655.8A CN109841944B (en) | 2019-03-26 | 2019-03-26 | Antenna and terminal |
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| CN109841944B true CN109841944B (en) | 2021-07-27 |
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Address after: 266071 Shandong city of Qingdao province Jiangxi City Road No. 11 Patentee after: Qingdao Hisense Mobile Communication Technology Co.,Ltd. Address before: 266071 Shandong city of Qingdao province Jiangxi City Road No. 11 Patentee before: HISENSE MOBILE COMMUNICATIONS TECHNOLOGY Co.,Ltd. |