CN111213283A

CN111213283A - Antenna system and terminal equipment

Info

Publication number: CN111213283A
Application number: CN201880045784.6A
Authority: CN
Inventors: 许志玮; 赖彦成; 余冬; 李建铭; 王汉阳; 吴鹏飞
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2018-05-15
Filing date: 2018-05-15
Publication date: 2020-05-29
Anticipated expiration: 2038-05-15
Also published as: CN111213283B; WO2019218167A1

Abstract

An antenna system applied to a terminal device, the terminal device including a frame body enclosed by a middle frame and a metal frame, the middle frame and the metal frame having a receiving space therebetween, the antenna system comprising: the first part is coupled with a part of the metal frame to form a loop antenna structure, and the loop antenna structure is arranged between the first MIMO antenna and the second MIMO antenna. The loop antenna structure is spaced apart from the first and second MIMO antennas by first and second spacings, respectively. The grounding end of the first MIMO antenna is close to the first interval, the grounding end of the second MIMO antenna is close to the second interval, and the feeding end of the first MIMO antenna and the feeding end of the second MIMO antenna are respectively close to the third interval and the fourth interval between the metal frame and the middle frame.

Description

Antenna system and terminal equipment

Technical Field

The application relates to the field of terminals, in particular to an antenna system and terminal equipment.

Background

With the development of the fourth generation mobile communication technology (4G), the throughput of data services of terminal devices (e.g., mobile phones) is improved, so that the user experience is improved. Multiple-input multiple-output (MIMO) technology and Carrier Aggregation (CA) are increasingly important. Therefore, the number of antennas and the supported frequency bands in the terminal equipment are also rapidly increasing.

In addition, the terminal device needs to take into account a variety of appearance factors, such as fashion sense of appearance Industrial Design (ID), feeling when the user holds the terminal device, increase of screen occupation ratio, and the like. In recent years, the terminal device pursues an ID design with a screen occupation of more than 80%, resulting in a clearance area above or below the terminal device of less than 2mm, and a space inside the terminal device for arranging an antenna becomes smaller. Meanwhile, after the number of the antennas is increased by adopting the MIMO technology, the space of the antennas is more compressed. In the MIMO technology, in addition to the increase of the number of antennas, the radiation field pattern between the antennas needs to be considered, and the throughput of MIMO can be effectively improved on the premise of meeting the index of Envelope Correlation Coefficient (ECC). In addition, for the antenna disposed at the top of the terminal device, besides the diversity antenna and the MIMO antenna, a Global Positioning System (GPS) antenna arrangement position and an upper hemisphere ratio of an antenna field type must be considered, so as to achieve good user experience.

In the prior art, in order to implement MIMO, a metal frame constituting an antenna may be divided more, so as to implement dividing the antenna located at the top of the terminal device into a plurality of antenna modules. For example, as shown in FIG. 1, Module1 and Module 2. The antenna radiator of Module1 includes top left side slot 101 and the metal stub that is located top left side slot 101 both sides: metal branches 102 and metal branches 103. The antenna radiator of Module2 includes top right slot 104 and metal stubs located on both sides of top right slot 104: metal branches 105 and metal branches 106. Adjacent to the Module1 and Module2, there is a metal wall 107. The metal wall 107 is used to improve the isolation between the Module1 and the Module 2. When the metal wall 107 is structurally implemented, two parts can be optionally connected at the metal frame and the front shell of the terminal device, the metal frame and the rear shell of the terminal device, and the radio frequency reference of the metal frame and the PCB to form a three-dimensional isolation structure, so as to form an isolation effect on the Module1 and the Module 2.

As shown in FIG. 1, Module1 may include M₁₁And M₁₂. Wherein M is₁₁May be MIMO 1. For example, the antenna bins of MIMO1 may include: wireless-fidelity (WIFI), mid-band (MB) and high-band (high-frequency) frequency bands. M₁₂May be a GPS antenna. Module2 may include M₂₁And M₂₂. Wherein M is₂₁The covered antenna frequency bands include: low frequency band (LB) band, M₂₂May be MIMO 2. MIMO2 may include the same antenna bands as MIMO 1.

However, in the scheme shown in fig. 1, the low-frequency antenna is designed as an inverted-F antenna (IFA), and the performance of the antenna is obviously deteriorated. In addition, since the antenna design space is obviously reduced, how to improve the design freedom of the main antenna is a technical problem to be solved in the future under the condition of ensuring the performance of the main antenna positioned at the bottom of the terminal device.

Disclosure of Invention

The embodiment of the invention provides an antenna system and terminal equipment, which are used for enabling an antenna at the top of the terminal equipment to be compatible with at least three paths of MB frequency bands.

In a first aspect, the present application provides an antenna system, applied to a terminal device, where the terminal device includes a frame body surrounded by a middle frame and a metal frame located at the top of the middle frame, the metal frame includes a plurality of frames, a first space is provided between every two adjacent frames in the plurality of frames, an accommodation space is provided between the middle frame and the metal frame, the accommodation space communicates with the first space, where the accommodation space is used for arranging components, and the antenna system includes: a first part coupled with a portion of the metal bezel to form a loop antenna structure, a first multiple-input multiple-output (MIMO) antenna and a second MIMO antenna disposed in the receiving space, wherein the loop antenna structure is located between the first MIMO antenna and the second MIMO antenna, the loop antenna structure is separated from the first MIMO antenna by a first gap, and the loop antenna structure is separated from the second MIMO antenna by a second gap; the loop antenna structure is used for covering a first frequency band and a second frequency band, the first MIMO antenna and the second MIMO antenna are respectively and at least used for covering the second frequency band, wherein the first frequency band is lower than the second frequency band, the grounding end of the first MIMO antenna is close to the first interval, the grounding end of the second MIMO antenna is close to the second interval, the feeding end of the first MIMO antenna is close to the metal frame and a third interval between the middle frames, and the feeding end of the second MOMO antenna is close to the metal frame and a fourth interval between the middle frames.

Optionally, the frequency band range of the first frequency band is: 760 MHz-1000 MHz. The frequency range of the second frequency band is: 1450MHz to 2200 MHz.

The antenna system provided by the embodiment of the application, because the loop antenna structure which can be used for covering the first frequency band, the global positioning system antenna frequency band and the second frequency band is arranged between the first MIMO antenna and the second MIMO antenna, the loop antenna structure and the first MIMO antenna are separated by a first interval, and the loop antenna structure and the second MIMO antenna are separated by a first interval. Therefore, the first MIMO antenna, the loop antenna structure and the second MIMO antenna can be made to obtain an effective isolation effect in terms of layout. Moreover, the first MIMO antenna and the second MIMO antenna are respectively used for covering at least a second frequency band, and the loop antenna structure can also cover the global positioning system antenna frequency band and the second frequency band. Therefore, when the antenna system is applied to the terminal equipment, the top antenna area of the terminal equipment can at least comprise three second frequency bands. In addition, the terminal device can generate a certain number of antenna requirements according to the communication specification requirements, taking the antenna system provided in the embodiment of the present application as an example, if the top antenna can support more than one antenna of the second frequency band, the antenna area at the bottom of the terminal device can reduce one antenna of the second frequency band, that is, the antenna design space at the bottom of the terminal device is enlarged, and the antenna design freedom at the bottom is improved.

In a possible implementation manner, the plurality of frames include a first frame, a second frame, and a third frame located between the first frame and the second frame, where the first component includes: the first end of the metal branch node is connected with the first end of the third frame, and the second end of the metal branch node is connected with the middle frame through a first grounding point; the first end of the matching component is connected with the second end of the third frame, the second end of the matching component is connected with the middle frame through a second grounding point, and the matching component is used for enabling the loop antenna structure to cover the first frequency band by matching the low-pass filter with the broadband matching and enabling the loop antenna structure to cover the second frequency band by matching the intermediate frequency filter (which can also be a band-pass filter) with the broadband matching. In the embodiment of the application, the loop antenna structure is used for covering the first frequency band and the GPS frequency band or the second frequency band. And the first frequency band and the GPS frequency band or the second frequency band are split by utilizing a low-pass filter and a band-pass filter, so that the matching freedom degree in each frequency band is improved by the co-body double feed.

In a possible implementation, the matching means comprise: the loop antenna structure comprises a first signal source, a second signal source, a first matching circuit and a second matching circuit, wherein the second signal source, the first matching circuit and the second matching circuit are arranged in parallel with the first signal source, the first end of the first signal source is connected with the second end of a third frame through the first matching circuit, the second end of the first signal source is connected with the middle frame through a third grounding point, the first end of the second signal source is connected with the second end of the third frame through the second matching circuit, the second end of the second signal source is connected with the middle frame through a fourth grounding point, the first matching circuit is used for enabling the loop antenna structure to cover a first frequency band by matching with a broadband through a low-pass filter, and the second matching circuit is used for enabling the loop antenna structure to cover a second frequency band by matching with the broadband through an intermediate frequency filter.

In a possible implementation, the first matching circuit comprises an adjustable component for tuning the operating frequency band of the loop antenna structure between one or more of the following frequency bands: corresponding to the B12 band, the B13 band, the B20 band, the B28 band, the B5 band and the B8 band in the long term evolution LTE system. By arranging the adjustable component in the first matching circuit, the coverage range of the working frequency band of the loop antenna structure can be wide.

In a possible implementation, the adjustable component is an adjustable inductor, or an adjustable capacitor. The circuit structure of the adjustable component can be simplified by an adjustable inductor or an adjustable capacitor.

In a possible implementation, the second end of the metal stub is connected to the middle frame by a printed circuit board PCB located in the receiving space.

In a possible implementation, the metal branch is a flexible circuit board FPC or a metal sheet.

In a possible implementation manner, the second frequency band covered by the loop antenna structure uses a one-time wavelength mode, and the second frequency band covered by the first MIMO antenna and the second MIMO antenna uses a composite right-left handed CRLH mode.

In a possible implementation, the first MIMO antenna and the second MIMO antenna utilize a coupled feed to generate a composite left-right-hand pattern covering a second frequency band; the metal branches form 1/4 Inverted F Antenna (IFA) mode to cover 2.4GHz or B1 frequency bands.

In a possible implementation manner, the loop antenna structure is further configured to cover a third frequency band, where the third frequency band is higher than the second frequency band, and the second frequency band covered by the loop antenna structure uses a 1.5-fold wavelength mode.

In a second aspect, the present application provides a terminal device, this terminal device includes and encloses synthetic framework by center and metal frame, and the metal frame includes a plurality of frames, has the interval between every two adjacent frames in a plurality of frames, has accommodation space between first frame and the metal frame, and accommodation space communicates with each other with the interval, and wherein, can be used to arrange components and parts in the accommodation space, this terminal device still includes: an antenna system as described in the first aspect or any one of its possible implementations of the first aspect; the metal frame is used as the peripheral part of the terminal equipment, the middle frame is arranged in the terminal equipment, and the antenna system is used for providing at least three second frequency bands for the terminal equipment.

Drawings

Fig. 1 is a schematic structural diagram of an antenna system provided in the prior art;

fig. 2 is a first schematic structural diagram of an antenna system according to an embodiment of the present invention;

fig. 3 is a second schematic structural diagram of an antenna system according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of an antenna system according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of an antenna system according to an embodiment of the present invention;

fig. 6 is a return loss curve of an simulated antenna of an LB-band antenna and an MB-band antenna/GPS antenna according to an embodiment of the present invention;

fig. 7 is a simulated antenna efficiency curve of a loop antenna structure according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of a GPS antenna pattern according to an embodiment of the present invention;

fig. 9 is a return loss curve of a simulated antenna of the antenna system according to the embodiment of the present invention;

fig. 10 is a view illustrating a radiation direction of an antenna pattern in an if band according to an embodiment of the present invention;

fig. 11 is a schematic structural diagram of an antenna system according to an embodiment of the present invention;

FIG. 12 illustrates simulation system efficiencies provided by embodiments of the present invention;

fig. 13 is a schematic structural diagram of a terminal device ID according to an embodiment of the present invention.

Detailed Description

For the convenience of clearly describing the technical solutions of the embodiments of the present invention, in the embodiments of the present invention, the words "first" and "second" are used to distinguish the same items or similar items with basically the same functions and actions, and those skilled in the art can understand that the words "first" and "second" do not limit the quantity and execution order.

The antenna system provided by the embodiment of the application can be applied to terminal equipment. The top of the terminal equipment is provided with a metal frame. Illustratively, the terminal device may be: handheld/wearable devices such as tablet computers, cell phones, MP4, tablet computers, notebooks, computers, or smartwatches, and the like.

The embodiment of the present application does not limit the communication system to which the terminal device is applied. Illustratively, the terminal device can be applied to the following communication systems: global system for mobile communications (GSM), Code Division Multiple Access (CDMA), Wideband Code Division Multiple Access (WCDMA), General Packet Radio Service (GPRS), Long Term Evolution (LTE) system, LTE-evolution (advanced, a), Universal Mobile Telecommunications System (UMTS), etc., and other future communication systems (e.g., 5G communication system).

As shown in fig. 2, fig. 2 is a schematic diagram of an antenna system provided in an embodiment of the present application, where the antenna system is applied in a terminal device, and the terminal device includes: a frame body enclosed by the middle frame 10 and the metal frame 20 (the solid line frame indicated by 20 in the figure is only used for identification, the solid line is not used for representing the actually existing components, and the same is shown in the following figures), and the metal frame 20 includes a plurality of frames, such as a first frame 201, a second frame 202 and a third frame 203, intervals are provided between every two adjacent frames of the plurality of frames, for example, a first interval a between the first frame 201 and the third frame 203, a second interval B between the third frame 203 and the second frame 202, and an accommodating space 30 is provided between the middle frame 10 and the metal frame 20 (the solid frame indicated by 30 in the figure is used for identification only, the solid line is not used for representing actually existing devices, and the same is provided in the following figures), and the accommodating space 30 communicates with the first interval a and the second interval B, wherein components can be arranged in the accommodating space 30, and the antenna system includes: a first part coupled with a portion of the metal frame for forming a loop antenna structure 60, a first MIMO antenna 40 disposed in the accommodating space 30 (the dashed box indicated by 40 in the figure is used to identify that the first MIMO antenna is located within the dashed box, and the dashed line itself is not used to identify an actually existing device, which is the same in the following figures), and a second MIMO antenna 50 (the dashed box indicated by 50 in the figure is used to identify that the second MIMO antenna is located within the dashed box, and the dashed line itself is not used to identify an actually existing device, which is the same in the following figures). Wherein the loop antenna structure 60 is located between the first MIMO antenna 40 and the second MIMO antenna 50 (the dashed box indicated by 60 in the figure is used to identify that the loop antenna structure is located within the dashed box, the dashed line itself is not used to represent the actual existing device, and the same applies in the following figures), the loop antenna structure 60 is separated from the first MIMO antenna 40 by a first interval (e.g., a first interval a), and the loop antenna structure 60 is separated from the second MIMO antenna 50 by a first interval (e.g., a second interval B); the loop antenna structure 60 is coupled to the metal frame 20, the loop antenna structure 60 is configured to cover a first frequency band and a second frequency band, the first MIMO antenna 40 and the second MIMO antenna 50 are at least configured to cover the second frequency band, a ground terminal of the first MIMO antenna 40 is close to the first interval a, a ground terminal of the second MIMO antenna 50 is close to the second interval B, a feeding terminal of the first MIMO40 antenna is close to the metal frame 20 and a third interval between middle frames, a feeding terminal of the second MIMO antenna 50 is close to the metal frame 30 and a fourth interval between the middle frames, wherein the third interval and the fourth interval are located on different sides. Optionally, the loop antenna structure 60 may also be used to cover a global positioning system antenna frequency band.

Optionally, in the embodiment of the present application, for example, the metal frame 20 is located above the middle frame 10, so that the antenna system provided in the embodiment of the present application may be an antenna system applied to the top of a terminal device. Alternatively, on the other hand, the metal frame 20 is located below the middle frame 10, so that the antenna system provided by the embodiment of the present application may be an antenna system applied to the bottom of a terminal device.

Optionally, the first frequency band may be an LB frequency band, and the second frequency band may be an MB frequency band. Illustratively, the frequency band range of the first frequency band is: 760 MHz-1000 MHz. The frequency range of the second frequency band is: 1450MHz to 2200 MHz.

It is to be understood that the first MIMO antenna 40 and the second MIMO antenna 50 in the embodiment of the present application are also used to cover a third frequency band, respectively. The third frequency band is larger than the second frequency band. Illustratively, the third frequency band may be a High Band (HB) frequency band.

Optionally, in the embodiment of the present application, the first MIMO antenna 40 and the second MIMO antenna 50 have the same structure. In the embodiment of the present application, the first MIMO antenna 40 and the second MIMO antenna 50 are symmetrically disposed.

For example, in the embodiment of the present application, the first MIMO antenna 40 is used to cover the second frequency band, the third frequency band, and the WIFI frequency band.

For example, the WIFI frequency band includes a 2.4G frequency band and a 5G frequency band.

It is to be understood that the positions of the first MIMO antenna 40 and the second MIMO antenna 50 may be interchanged in the embodiments of the present application, and the embodiments of the present application do not limit this.

For example, the frequency range of the LB frequency band in the embodiment of the present application is: 760MHz to 1000MHz frequency band. The LB frequency band may also be understood to correspond to one or more frequency bands of a B28 frequency band, a B12 frequency band, a B13 frequency band, a B17 frequency band, a B5 frequency band, and a B8 frequency band in the LTE system.

For example, the frequency band range of the MB frequency band in the embodiment of the present application is: 1450MHz to 2200MHz frequency band. It can also be understood that the MB frequency band corresponds to one or more frequency bands of a B32 frequency band, a B3 frequency band, a B1 frequency band, a B2 frequency band, and a B4 frequency band in the LTE system. Specifically, the frequency band of the GPS is 1575 MHz.

Optionally, a Printed Circuit Board (PCB) (e.g., a Flexible Printed Circuit (FPC)) is disposed in the accommodating space 30 in the embodiment of the present application. The PCB is used for arranging components. For example, the components used in the first MIMO antenna 40, the second MIMO antenna 50 and the loop antenna structure 60 in this application are located on the PCB.

Optionally, the material of the middle frame 10 in the embodiment of the present application is a metal material.

It should be noted that in the embodiment of the present application, the middle frame 10 and the metal frame 20 may have a second interval therebetween, or may not have the second interval.

It is understood that the plurality of frames in the embodiment of the present application may include three or more frames. In the embodiment of the present application, the plurality of frames include a first frame 201, a second frame 202, and a third frame 203, where the third frame 203 is located between the first frame 201 and the second frame 202.

Illustratively, the first frame 201 includes: the first sub-frame and the second sub-frame are vertically connected. Optionally, a joint of the first sub-frame and the second sub-frame may have a radian of a preset angle. The second bezel 202 includes: the third sub-frame and the fourth sub-frame are vertically connected. Optionally, a joint of the third sub-frame and the fourth sub-frame may have a radian of a preset angle. The third frame is a frame which is positioned on the same horizontal line with the first frame and the second frame.

Specifically, in the embodiment of the present application, as shown in fig. 3, the ground G3 of the first MIMO antenna 40 is connected to the first frame 201, and the ground G3 is close to the first interval between the first frame 201 and the third frame 203. The feeding end 401 of the first MIMO antenna 40 is connected to the first frame 201, and the feeding end 401 is close to the second interval C between the first frame 201 and the middle frame 10. Specifically, the feeding terminal 401 is used as an input source of the first MIMO antenna 40. Thus, those skilled in the art know how to generate a composite left-right hand pattern at the first frame between the ground terminal G3 and the feed terminal 401 to cover the second frequency band. In the figure, a circuit between the signal source 4011 and the first frame 201, which includes a capacitor, is omitted.

Illustratively, the feeding terminal 401 includes a signal source 4011 located on the PCB, a first end of the signal source 4011 is connected to the first bezel 201, and a second end of the feeding terminal 401 is connected to the middle bezel through the ground terminal G4.

As shown in fig. 3, the ground G5 of the second MIMO antenna 50 in the embodiment of the present application is connected to the second frame 202, and the ground G5 is close to the first interval between the second frame 202 and the third frame 203. The feeding end 501 of the second MIMO antenna 50 is connected to the second frame 202, and the feeding end 501 of the second MIMO antenna 50 is close to the second interval D between the second frame 202 and the middle frame 10. Specifically, the feeding terminal 501 is used as an input source of the second MIMO antenna 50.

Illustratively, the feeding terminal 501 includes a signal source 5011 located on the PCB, a first end of the signal source 5011 is connected to the second bezel 202, and a second end of the feeding terminal 501 is connected to the middle bezel 10 through a grounding terminal G6.

As shown in fig. 4, the first component provided by the embodiment of the present application includes: a metal branch 601 and a matching component 602, wherein a first end of the metal branch 601 is connected with a first end of the third frame 203, and a second end of the metal branch 601 is connected with the middle frame 10 through a first grounding point G1; the first end of the matching block 602 is connected to the second end of the third bezel 203, and the second end of the matching block 602 is connected to the middle bezel 10 via a second grounding point G2, for covering the first frequency band (for example, 760MHz to 1000MHz band) with the loop antenna structure 60 by a low pass filter in cooperation with broadband matching and for covering the second frequency band (for example, 1450MHz to 2200MHz band) with the loop antenna structure by an intermediate frequency filter in cooperation with broadband matching.

It is understood that the loop of the loop antenna structure 60 in the embodiment of the present application: the loop antenna structure 60 is formed by a metal branch 601, a matching component 602, and a metal branch located between a first end of the metal branch 601 and a first end of the matching component 602, that is, the metal branch 601 needs to be coupled to the loop antenna structure.

The loop of the first MIMO antenna 40 in the embodiment of the present application: is composed of a feeding end 401, a grounding end G3 and a metal branch section positioned between the feeding end 401 and the grounding end G3.

The loop of the second MIMO antenna 50 in the embodiment of the present application: the feed terminal 501, the ground terminal G5, and the metal branch between the feed terminal 501 and the ground terminal G5.

Specifically, the metal branch 601 and the third frame 203 in the present application may be an integral structure, or may be connected together by other fixing means (e.g., welding means).

Optionally, the second end of the metal branch 601 is connected to the middle frame 10 through a printed circuit board PCB located in the accommodating space.

Optionally, the metal branch 601 is a Flexible Printed Circuit (FPC) or a metal sheet.

Illustratively, as shown in fig. 5, fig. 5 shows a specific structure of a matching component 602 provided in the present application, and the matching component 602 shown in fig. 5 includes: a first signal source 6021, and a second signal source 6022, a first matching circuit (MC 1)6023, and a second matching circuit 6024 arranged in parallel with the first signal source 6021, wherein a first end of the first signal source 6021 is connected to a second end of the third rim 203 through the first matching circuit 6023, a second end of the first signal source 6021 is connected to the middle frame 10 through a third grounding point G6, a first end of the second signal source 6022 is connected to a second end of the third rim 203 through the second matching circuit 6024, a second end of the second signal source 6022 is connected to the middle frame 10 through a fourth grounding point G7, wherein the first matching circuit 6023 is configured to use a low-pass filter to cooperate with broadband matching to enable the loop antenna structure 60 to cover a frequency band of 760MHz to 1000MHz, and the second matching circuit 6024 is configured to use an intermediate frequency filter to cooperate with broadband matching to enable the loop antenna structure 60 to cover a frequency band of 1450MHz to MHz.

The embodiment of the present application does not limit the specific structures of the first matching circuit and the second matching circuit.

In order to make the radiation pattern direction of the second frequency band covered by the loop antenna structure 60 different from the radiation pattern direction of the second frequency band covered by the first MIMO antenna 40 and the second MIMO antenna 50. In the embodiment of the present application, the second frequency band covered by the loop antenna structure 60 and the second frequency band covered by the first MIMO antenna 40 and the second MIMO antenna 50 use different modes.

For example, the second frequency band covered by the loop antenna structure 60 uses a one-time wavelength mode (also referred to as a balanced mode). The second frequency band covered by the first MIMO antenna 40 and the second MIMO antenna 50 uses a composite right/left-handed (CRLH) mode.

Since the first MIMO antenna 40, the second MIMO antenna 50 and the loop antenna structure 60 respectively use different modes, the radiation pattern directions of the second frequency bands covered by the first MIMO antenna 40, the second MIMO antenna 50 and the loop antenna structure 60 respectively are different. In this way, even if there are three second frequency bands in the upper half of the terminal device, the antenna far-field Envelope Correlation Coefficient (ECC) between the first MIMO antenna 40 and the second MIMO antenna 50 and between the loop antenna structures 60 is still better than 0.155. Meanwhile, the GPS antenna also uses a loop antenna balanced mode, and the GPS upper hemisphere proportion can be optimized (more than 60%). The ECC is used for determining the similarity index of the two antenna patterns. 0 represents that the two antenna patterns are completely independent, and 1 represents that the two antenna patterns are completely coincident.

In the embodiment of the present application, a double wavelength mode refers to that the operating (resonance) frequency of the antenna is a double wavelength on the metal radiator (taking the loop antenna structure as an example, the feed end will be from the current strong point to the current zero point to the current strong point from the antenna ground end).

The CRLH is a coupling feed-in of the antenna at the end large voltage region, so that the current density is concentrated from the feed end to the ground end, and the resonant length of the antenna can be reduced to approximately one eighth of the wavelength.

Optionally, as another embodiment of the present application, the first MIMO antenna and the second MIMO antenna respectively use coupled feed-in to generate a composite left-right-handed mode to cover the second frequency band. The metal branch forms 1/4IFA antenna mode to cover 2.4GHz or B1 frequency band, and in addition, the coupling unit covers B7 frequency band with the side seam below.

In the embodiment of the present application, the IFA antenna is also referred to as an inverted F antenna, and the shape of the antenna is an inverted "F", and the IFA antenna includes a grounding point and a feeding point. Generally, the radiation portion of the IFA antenna is a flat plate or a straight line, and the IFA antenna further includes a ground pin connected between the ground point and the radiation portion and a feeding portion connected between the feeding point and the radiation portion. The feed point and the ground pin may be parallel to each other and both may be perpendicular to the radiating portion.

Optionally, as another embodiment of the present application, the loop antenna structure in the present application is further used to cover a third frequency band,

as another embodiment of the present application, the two terminal devices have slots (for example, slots E and F shown in fig. 3 to 5) at the second interval to form a parasitic structure, the first MIMO antenna covers the second frequency band and the third frequency band by using the composite left-right-hand mode, the quarter IF a and the parasitic mode, and the second MIMO antenna covers the second frequency band and the third frequency band by using the composite left-right-hand mode, the quarter IF a and the parasitic mode.

Optionally, the antenna system in this embodiment of the application is further configured to provide frequency bands such as 2 HB frequency bands MIMO, GPS, and 2 × 2 WIFI.

The following embodiments will take the first frequency band as the LB frequency band and the second frequency band as the MB frequency band as an example:

in fig. 6, the return loss curve of the simulated antenna of the top LB frequency band and the MB frequency band/GPS antenna frequency band is only considered in the embodiment of the present application, and as shown in fig. 6, since the LB frequency band uses a low-pass filter in the first matching circuit and the MB frequency band/GPS antenna frequency band uses a band-pass (high-pass) filter in the second matching circuit, as shown by a line marked as C in fig. 6, the isolation of the loop antenna structure can be better than-10 dB.

FIG. 7 shows simulated antenna efficiency curves for the embodiments of the present application, where the efficiency of the LB band (line marked 1 in FIG. 7) is about-7.5 dBi to-8.5 dBi in the 760MHz to 1000MHz bands. -8.5dB efficiency bandwidth of 250 MHz; the efficiency of the MB band/GPS antenna band (line marked as 2 in FIG. 7) from 1450MHz to 2170MHz is about-2.0 to-6.1 dBi, and can cover the frequency bands including the B1 band/B2 band/B3 band/B4 band/B32 band in the GPS antenna and LTE system.

In addition, since the MB frequency band/GPS frequency band uses a one-time wavelength mode of the loop antenna structure, referring to fig. 8, which is a GPS antenna pattern diagram of the embodiment of the present application, the GPS antenna pattern is intensively radiated to the top of the mobile phone (the GPS upper hemisphere accounts for about 60-65%), and the GPS wireless performance is improved.

In addition, in the embodiment of the present application, since the first MIMO antenna and the second MIMO antenna are disposed on the left and right sides of the loop antenna structure, both the first MIMO antenna and the second MIMO antenna can be designed to include an antenna of a second frequency band (for example, an intermediate frequency band), an antenna of a third frequency band (for example, a high frequency band), and a WIFI frequency band, and a return loss curve of the specific simulation antenna is as shown in fig. 9. Referring to fig. 10, it can be seen that even if three MIMO antennas are disposed on the top of the terminal device, the antenna patterns of the intermediate frequency band can still radiate in different directions. Table 1 lists the ECC results between the GPS/MB antenna and the first MIMO antenna and between the GPS/MB antenna and the second MIMO antenna, and the ECC performance of the second frequency band is less than 0.155 and better than the ECC index (less than 0.3) of the main operator.

In fig. 9, a line denoted by 5 indicates a return loss curve of an LB band, a line denoted by 6 indicates a return loss curve of an MB band/GPS antenna band, a line denoted by 7 indicates a return loss curve of a first MIMO antenna, a line denoted by 8 indicates a return loss curve of a second MIMO antenna, and a line denoted by 3 indicates an isolation contrast between an antenna of an LB band and a GPS antenna. The line labeled 4 represents the isolation of the GPS antenna versus the isolation between the second MIMO antenna.

TABLE 1

As another embodiment of the present application, as shown in fig. 11, in the present application, an adjustable component 6025 is included in the first matching circuit 6023, and the adjustable component 6025 is configured to tune the operating frequency band of the loop antenna structure 60 between a B12 frequency band/a B13 frequency band/a B20 frequency band/a B28 frequency band/a B5 frequency band/a B8 frequency band of the long term evolution LTE system.

As an example, the adjustable component 6025 may be an adjustable inductor, or an adjustable capacitor.

As shown in fig. 12, fig. 12 is a diagram illustrating simulation system efficiency of another possible embodiment of the antenna system provided by the embodiment of the present application, in which the tunable matching circuit component is used to realize antenna operating frequency tuning, and the difference between fig. 11 and the above embodiment is: the low frequency matching circuit (e.g., the first matching circuit 6023 described in the above-described embodiment) further includes an adjustable component 6025 therein. Thus, by selecting the adjustable component 6025, the operating frequency band of the antenna system can be tuned between the corresponding B12 band/B13 band/B20 band/B28 band/B5 band/B8 band in the LTE system. The line labeled 10 in fig. 12 represents the efficiency of the LB band. The line labeled 11 indicates that the LB band corresponds to the B20 band/B28 band in the LTE system. The line marked 12 indicates that the LB band corresponds to the B8 band in the LTE system.

It should be noted that the setting of the adjustable component 6025 in the first matching circuit 6023 is only an implementation manner for enabling the working frequency band of the antenna system to be tuned between the B12 frequency band/B13 frequency band/B20 frequency band/B28 frequency band/B5 frequency band/B8 frequency band corresponding to the LTE, and in an actual process, other manners may also be used for enabling the working frequency band of the antenna system to be tuned between the B12 frequency band/B13 frequency band/B20 frequency band/B28 frequency band/B5 frequency band/B8 frequency band corresponding to the LTE, which is not described herein again.

The embodiment of the application provides a terminal equipment, this terminal equipment include by the center with be located the synthetic framework is enclosed to the metal frame at center top, the metal frame includes a plurality of frames, first interval has between every two adjacent frames in a plurality of frames, first frame with accommodation space has between the metal frame, accommodation space with first interval communicates with each other, wherein, can be used to arrange components and parts in the accommodation space, terminal equipment still includes: the antenna system as described in the above embodiments; the antenna system is used for providing at least three paths of second frequency bands for the terminal equipment.

Optionally, the antenna system provided in the embodiment of the present application is further configured to provide two third frequency bands for the terminal device.

The embodiment of the invention can be applied to terminal equipment with various ID designs, and as shown in FIG. 13, four metal frames are respectively arranged on the metal frame positioned at the top of the terminal equipment and the metal frame positioned at the bottom of the terminal equipment at intervals. Namely, two spaces (e.g., C and D) between the junctions of the top metal bezel 11 and the middle frame 21, first spaces a and B on the top metal bezel 11, third spaces E and F on the bottom metal bezel 31, and two spaces (e.g., G and H) between the junctions of the bottom metal bezel 31 and the middle frame 21.

It can be understood that, in the embodiment of the present application, the rear shell of the terminal device may be made of a metal material or a waste metal material, which is not limited in this application.

The size of the terminal device is not limited in the embodiment of the application. Illustratively, the size of the terminal device in the embodiment of the present application is 146 × 74 × 8.5mm³. Illustratively, the length of the third frame in the embodiment of the present application is 50 mm.

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 appended claims.

Claims

An antenna system, characterized in that, be applied to terminal equipment, terminal equipment includes the framework that is enclosed by center and metal frame and is synthetic, the metal frame includes a plurality of frames, the interval has between every two adjacent frames in a plurality of frames, the center with have accommodation space between the metal frame, antenna system includes:

a first part coupled with a portion of the metal bezel to form a loop antenna structure, a first multiple-input multiple-output (MIMO) antenna and a second MIMO antenna disposed in the receiving space, wherein the loop antenna structure is located between the first MIMO antenna and the second MIMO antenna, the loop antenna structure is separated from the first MIMO antenna by a first gap, and the loop antenna structure is separated from the second MIMO antenna by a second gap; the loop antenna structure is used for covering a first frequency band and a second frequency band, the first MIMO antenna and the second MIMO antenna are respectively and at least used for covering the second frequency band, wherein the first frequency band is lower than the second frequency band, the grounding end of the first MIMO antenna is close to the first interval, the grounding end of the second MIMO antenna is close to the second interval, the feeding end of the first MIMO antenna is close to the metal frame and a third interval between the middle frames, and the feeding end of the second MOMO antenna is close to the metal frame and a fourth interval between the middle frames.
The antenna system of claim 1, wherein the plurality of rims comprises a first rim, a second rim, and a third rim positioned between the first rim and the second rim, wherein the first component comprises: metal branches, and matching components;

the first end of the metal branch knot is connected with the first end of the third frame, and the second end of the metal branch knot is connected with the middle frame through a first grounding point; the first end of the matching component is connected with the second end of the third frame, and the second end of the matching component is connected with the middle frame through a second grounding point, so that the loop antenna structure covers the first frequency band by matching a low-pass filter with a broadband matching and the loop antenna structure covers the second frequency band by matching an intermediate frequency filter with the broadband matching.
The antenna system of claim 2, wherein the matching component comprises: the loop antenna comprises a first signal source, a second signal source, a first matching circuit and a second matching circuit, wherein the second signal source, the first matching circuit and the second matching circuit are arranged in parallel with the first signal source, the first end of the first signal source is connected with the second end of a third frame through the first matching circuit, the second end of the first signal source is connected with the middle frame through a third grounding point, the first end of the second signal source is connected with the second end of the third frame through the second matching circuit, the second end of the second signal source is connected with the middle frame through a fourth grounding point, the first matching circuit is used for enabling the loop antenna structure to cover the first frequency band by matching with a low-pass filter through broadband matching, and the second matching circuit is used for enabling the loop antenna structure to cover the second frequency band by matching with a medium-frequency filter through broadband matching.
The antenna system of claim 3, wherein the first matching circuit comprises an adjustable component for tuning the loop antenna structure operating frequency band between one or more of: corresponding to the B12 band, B13 band, B20 band, B28 band, B5 band and B8 band of the long term evolution, LTE, system.
The antenna system of claim 4, wherein the adjustable component is an adjustable inductor or an adjustable capacitor.
An antenna system according to any of claims 2-5, characterized in that the second end of the metal stub is connected to the center frame by means of a printed circuit board, PCB, located in the receiving space.
The antenna system of any of claims 2-6, wherein the metal stub is a flexible circuit board (FPC) or a metal sheet.
The antenna system of any of claims 1-7, wherein the second band covered by the loop antenna structure uses a one-times wavelength mode, and wherein the second band covered by the first and second MIMO antennas uses a composite right-left handed CRLH mode.
The antenna system according to any of claims 1-7, wherein the first and second MIMO antennas utilize a coupled feed to generate a composite left-right-hand pattern covering a second frequency band;

the metal branch forms 1/4 inverted F antenna mode covering 2.4GHz or B1 frequency band.
The antenna system according to any of claims 1-7, wherein the loop antenna structure is further configured to cover a third frequency band, the third frequency band being higher than the second frequency band, the second frequency band covered by the loop antenna structure using a 1.5 times wavelength pattern.
The antenna system according to any of claims 1-7, characterized in that the loop antenna structure is further adapted to cover the global positioning system, GPS, antenna frequency band.
The utility model provides a terminal equipment, its characterized in that, terminal equipment includes and encloses synthetic framework by center and metal frame, the metal frame includes a plurality of frames, the interval has between every two adjacent frames in a plurality of frames, first frame with accommodation space has between the metal frame, accommodation space with the interval communicates with each other, wherein, can be used to arrange components and parts in the accommodation space, terminal equipment still includes: an antenna system as claimed in any one of claims 1 to 10;

the metal frame is used as the peripheral part of the terminal equipment, the middle frame is arranged in the terminal equipment, and the antenna system is used for providing at least three paths of second frequency bands for the terminal equipment.