阅读说明：本技术 天线结构及具有该天线结构的无线通信装置 (Antenna structure and wireless communication device with same ) 是由 萧家宏 张书玮 陈文元 欧昌欣 邹明佑 梁家铭 黄国仑 于 2018-08-31 设计创作，主要内容包括：本发明提供一种天线结构,包括金属框,自所述金属框划分出间隔设置的第一天线、第二天线、第三天线及第四天线,所述天线结构还包括设置于所述金属框内的第五天线,所述第一天线、所述第二天线、所述第三天线和所述第四天线组成第一多输入多输出天线以提供第二频段的4x4多输入多输出；所述第一天线、所述第二天线、所述第三天线和所述第五天线组成第二多输入多输出天线以提供第三频段的4x4多输入多输出；所述第一天线和所述第三天线组成第三多输入多输出天线以提供第一频段的2x2多输入多输出。本发明还提供一种具有该天线结构的无线通信装置。上述天线结构可涵盖至LTE-A低、中、高频频段、GPS频段及WIFI 2.4GHz频段。(The invention provides an antenna structure, which comprises a metal frame, and a first antenna, a second antenna, a third antenna and a fourth antenna which are arranged at intervals and partitioned from the metal frame, wherein the antenna structure further comprises a fifth antenna arranged in the metal frame, and the first antenna, the second antenna, the third antenna and the fourth antenna form a first multi-input multi-output antenna so as to provide 4x4 multi-input multi-output of a second frequency band; the first antenna, the second antenna, the third antenna and the fifth antenna form a second multiple-input multiple-output antenna to provide 4x4 multiple-input multiple-output of a third frequency band; the first antenna and the third antenna constitute a third multiple-input multiple-output antenna to provide 2x2 multiple-input multiple-output for a first frequency band. The invention also provides a wireless communication device with the antenna structure. The antenna structure can cover LTE-A low, medium and high frequency bands, GPS frequency bands and WIFI2.4GHz frequency bands.)

1. An antenna structure, characterized by: the antenna structure comprises a metal frame, at least one feed-in source, a first grounding point, a second grounding point, a first breakpoint, a second breakpoint, a third breakpoint and a fourth breakpoint, wherein the metal frame is provided with the first breakpoint, the second breakpoint, the third breakpoint and the fourth breakpoint which are all communicated with and separate the metal frame, and the metal frame is divided into a first antenna, a second antenna, a third antenna and a fourth antenna which are arranged at intervals The third antenna and the fourth antenna constitute a first multiple-input multiple-output antenna to provide 4x4 multiple-input multiple-output for a second frequency band; the first antenna, the second antenna, the third antenna and the fifth antenna form a second multiple-input multiple-output antenna to provide 4x4 multiple-input multiple-output of a third frequency band; the first antenna and the third antenna constitute a third multiple-input multiple-output antenna to provide 2x2 multiple-input multiple-output for a first frequency band.

2. The antenna structure of claim 1, characterized in that: the at least one feed-in source comprises a first feed-in source, a second feed-in source, a third feed-in source, a fourth feed-in source and a fifth feed-in source, when current enters from the first feed-in source, the current passes through the first antenna, and then the first antenna simultaneously excites a first mode, a second mode and a third mode to generate radiation signals of the first frequency band, the second frequency band and the third frequency band; when current enters from the second feed-in source, the current passes through the second antenna, so that the second antenna simultaneously excites the second mode and the third mode to generate radiation signals of the second frequency band and the third frequency band; when current enters from the third feed-in source, the current passes through the third antenna, so that the third antenna simultaneously excites the first mode, the second mode and the third mode to generate radiation signals of the first frequency band, the second frequency band and the third frequency band; when current enters from the fourth feed-in source, the current passes through the fourth antenna, so that the fourth antenna excites the second mode and the fourth mode to generate radiation signals of the second frequency band and the fourth frequency band; when a current enters from the fifth feed-in source, the current passes through the fifth antenna, so that the fifth antenna excites the third mode to generate a radiation signal of the third frequency band.

3. The antenna structure of claim 2, characterized in that: the first mode is an LTE-A low-frequency mode, the second mode is an LTE-A medium-frequency mode, the third mode is an LTE-A high-frequency mode, the fourth mode is a GPS mode, the frequency of the third frequency band is higher than that of the second frequency band, the frequency of the second frequency band is higher than that of the fourth frequency band, and the frequency of the fourth frequency band is higher than that of the first frequency band.

4. The antenna structure of claim 1, characterized in that: the antenna structure further comprises a first switching circuit, the first switching circuit comprises a first switch and a plurality of first switching elements, the first switch is electrically connected to the first antenna, the first switching elements are connected in parallel, one end of each first switching element is electrically connected to the first switch, the other end of each first switching element is electrically connected to the first grounding point, each first switching element has different impedance, and the first switching elements are switched to different first switching elements by controlling the switching of the first switching elements, so that the first frequency band of the first antenna is adjusted.

5. The antenna structure of claim 1, characterized in that: the antenna structure further comprises a second switching circuit, the second switching circuit comprises a second switch and a plurality of second switching elements, the second switch is electrically connected to the third antenna, the second switching elements are connected in parallel, one end of each second switching element is electrically connected to the second switch, the other end of each second switching element is electrically connected to the second grounding point, each second switching element has different impedance, and the second switching switch is switched to different second switching elements by controlling the switching of the second switch, so that the first frequency band of the third antenna is adjusted.

6. The antenna structure of claim 2, characterized in that: the antenna structure further comprises a third switching circuit, a connecting portion and a third grounding point, wherein the connecting portion is electrically connected between the second feed-in source and the second antenna, one end of the third switching circuit is electrically connected to the third grounding point, the other end of the third switching circuit is connected to the connecting portion, and the third switching circuit is used for grounding the output end of the second feed-in source when the multi-input multi-output function is turned off so as to avoid the influence on the radiation signal of the first antenna.

7. The antenna structure of claim 1, characterized in that: and insulating materials are filled in the first break point, the second break point, the third break point and the fourth break point.

8. The antenna structure of claim 1, characterized in that: the metal frame between the first breakpoint and the second breakpoint constitutes the first antenna, the metal frame between the third breakpoint and the fourth breakpoint constitutes the third antenna, the metal frame between the second breakpoint and the third breakpoint that is close to the first antenna constitutes the second antenna, the metal frame between the second breakpoint and the third breakpoint that is close to the third antenna constitutes the fourth antenna, and the fifth antenna is close to the fourth breakpoint.

9. The antenna structure of claim 8, characterized in that: the antenna structure further comprises a sixth antenna, and the metal frame close to the first antenna between the first breakpoint and the fourth breakpoint forms the sixth antenna.

10. A wireless communication apparatus, characterized in that: comprising an antenna structure according to any of claims 1-9.

Technical Field

The invention relates to an antenna structure and a wireless communication device with the same.

Background

At present, most of wireless communication devices in the market adopt a metal frame as an outer frame structure, one or more breakpoints are arranged on the metal frame, the metal frame is divided into a plurality of sections through the breakpoints, and one or more sections of the metal frame are used as a part of antenna radiation, so that the requirement of the wireless communication device on the communication frequency band is met. However, this design antenna has insufficient band coverage. Due to the arrangement of Multiple-Input Multiple-Output (MIMO) antennas, the number of antennas is multiplied in a narrow wireless communication device environment, which puts higher demands on the isolation between the antennas. Therefore, it is necessary to design a MIMO antenna with a wide frequency band coverage on a metal frame of a wireless communication device.

Disclosure of Invention

In view of the above, it is desirable to provide an antenna structure and a wireless communication device having the same.

An antenna structure comprises a metal frame, at least one feed-in source, a first grounding point, a second grounding point, a first breakpoint, a second breakpoint, a third breakpoint and a fourth breakpoint, wherein the metal frame is provided with the first breakpoint, the second breakpoint, the third breakpoint and the fourth breakpoint, the first breakpoint, the second breakpoint, the third breakpoint and the fourth breakpoint are all communicated with and separate the metal frame, and the metal frame is divided into a first antenna, a second antenna, a third antenna and a fourth antenna which are arranged at intervals The third antenna and the fourth antenna constitute a first multiple-input multiple-output antenna to provide 4x4 multiple-input multiple-output for a second frequency band; the first antenna, the second antenna, the third antenna and the fifth antenna form a second multiple-input multiple-output antenna to provide 4x4 multiple-input multiple-output of a third frequency band; the first antenna and the third antenna constitute a third multiple-input multiple-output antenna to provide 2x2 multiple-input multiple-output for a first frequency band.

A wireless communication device comprises the antenna structure.

The antenna structure and the wireless communication device with the same comprise the first antenna, the second antenna, the third antenna, the fourth antenna and the fifth antenna, so that the coverage range of the frequency band of the antenna structure is large, the antenna structure can cover LTE-A low, medium and high frequency bands, GPS frequency bands and WIFI2.4GHz frequency bands, and the frequency range is wide. The first antenna, the second antenna, the third antenna, and the fourth antenna collectively form a first multiple-input multiple-output antenna; the first antenna, the second antenna, the third antenna, and the fifth antenna collectively form a second multiple-input multiple-output antenna; the first antenna and the third antenna together form a third multiple-input multiple-output antenna; the three mimo antennas may provide 2x2 and 4x4 mimo functions.

Drawings

Fig. 1 is a schematic diagram illustrating an antenna structure applied to a wireless communication device according to a first preferred embodiment of the present invention.

Fig. 2 is a circuit diagram of a first switching circuit in the antenna structure shown in fig. 1.

Fig. 3 is a circuit diagram of a second switching circuit in the antenna structure shown in fig. 1.

Fig. 4 is a graph of the S-parameter (scattering parameter) of the first antenna in the antenna structure of fig. 1.

Fig. 5 is a graph of radiation efficiency of the first antenna when the first switch is switched to a different first switching element in the first switching circuit shown in fig. 2.

Fig. 6 is a radiation efficiency curve diagram of the first antenna in the antenna structure shown in fig. 4 when the first antenna operates in the high-frequency mode in LTE-a.

Fig. 7 is a graph of the S-parameter (scattering parameter) of the second antenna in the antenna structure of fig. 1.

Fig. 8 is a graph of the radiation efficiency of a second antenna in the antenna structure of fig. 7.

Fig. 9 is a graph of the S-parameter (scattering parameter) of the third antenna in the antenna structure of fig. 1.

Fig. 10 is a graph of the radiation efficiency of the third antenna in the antenna structure of fig. 9.

Fig. 11 is a graph of the S-parameter (scattering parameter) of the fourth antenna in the antenna structure of fig. 1.

Fig. 12 is a graph of the total radiation efficiency of the fourth antenna in the antenna structure of fig. 11.

Fig. 13 is a graph of the S-parameter (scattering parameter) of the fifth antenna in the antenna structure of fig. 1.

Fig. 14 is a graph of the total radiation efficiency of the fifth antenna in the antenna structure of fig. 13.

Fig. 15 is a schematic diagram of an antenna structure according to a second preferred embodiment of the present invention.

Description of the main elements

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It will be understood that when an element is referred to as being "electrically connected" to another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "electrically connected" to another element, it can be connected by contact, e.g., by wires, or by contactless connection, e.g., by contactless coupling.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Some embodiments of the invention are described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

Referring to fig. 1, an antenna structure 100 according to a preferred embodiment of the present invention is applied to a wireless communication device 200 for transmitting and receiving radio waves to transmit and exchange wireless signals. The wireless communication device 200 can be a mobile phone, a personal digital assistant, or other wireless communication device.

The antenna structure 100 includes a housing 11, a first feeding source F1, a second feeding source F2, a third feeding source F3, a fourth feeding source F4, a fifth feeding source F5, a first ground point G1, a second ground point G2, and a third ground point G3. The first feeding source F1, the second feeding source F2, the third feeding source F3, the fourth feeding source F4 and the fifth feeding source F5 are disposed inside the housing 11 for feeding current to the antenna structure 100. The first grounding point G1, the second grounding point G2, and the third grounding point G3 are all disposed inside the housing 11 for providing grounding for the antenna structure 100.

The housing 11 may be an outer shell of the wireless communication device 200. The housing 11 includes at least a metal frame 111. The metal frame 111 has a substantially ring-shaped structure. The housing 11 may further include a back plate (not shown). The back plate is covered on the metal frame 111, and forms an accommodating space (not shown) together with the metal frame 111. The accommodating space is used for accommodating electronic components or circuit modules such as a circuit board, a processing unit and the like of the wireless communication device 200.

The metal frame 111 at least includes a first side 101, a second side 102, a third side 103 and a fourth side 104 connected in sequence. In this embodiment, the first side 101 is opposite to the third side 103. The second side 102 is disposed opposite to the fourth side 104. The first side 101, the second side 102, the third side 103 and the fourth side 104 together form the ring structure. In this embodiment, the first side 101 is defined as a bottom end of the wireless communication device 200, and the third side 103 is defined as a top end of the wireless communication device 200.

The metal frame 111 is provided with a first breakpoint 13, a second breakpoint 14, a third breakpoint 15 and a fourth breakpoint 16. In this embodiment, the first breaking point 13 is opened at a position of the first side 101 close to the fourth side 104. The second breaking point 14 is opened at a position of the first side 101 close to the second side 102. The third break point 15 is arranged on the third side 103 close to the second side 102. The fourth break point 16 is arranged at a position of the fourth side 104 close to the third side 103. The first break point 13, the second break point 14, the third break point 15, and the fourth break point 16 all penetrate and block the metal frame 111. The first break point 13, the second break point 14, the third break point 15, and the fourth break point 16 divide the metal frame 111 into a first antenna a1, a second antenna a2, a third antenna A3, and a fourth antenna a4, which are disposed at intervals. In other embodiments, the positions of the first break point 13, the second break point 14, the third break point 15, and the fourth break point 16 can be adjusted as needed.

Wherein the metal frame 111 between the first disconnection point 13 and the second disconnection point 14 forms the first antenna a 1. The portion of the metal frame 111 between the second disconnection point 14 and the third disconnection point 15 near the first antenna a1 forms the second antenna a 2. The metal frame 111 between the third disconnection point 15 and the fourth disconnection point 16 forms the third antenna a 3. The portion of the metal frame 111 between the second disconnection point 14 and the third disconnection point 15 near the third antenna A3 forms the fourth antenna a 4. The fifth antenna a5 is disposed in the housing 11, i.e., a built-in antenna disposed in the metal frame 111. The fifth antenna a5 is adjacent the fourth break point 16. The fifth antenna a5 may be any shape radiator.

The metal frame 111 between the second break point 14 and the third break point 15 including the second side 102 is grounded, and the metal frame 111 between the first break point 13 and the fourth break point 16 including a portion of the fourth side 104 is also grounded.

It can be understood that, in the present embodiment, the first breaking point 13, the second breaking point 14, the third breaking point 15 and the fourth breaking point 16 are filled with an insulating material, such as plastic, rubber, glass, wood, ceramic, etc., but not limited thereto.

In this embodiment, the first feed source F1, the second feed source F2, the third feed source F3, the fourth feed source F4 and the fifth feed source F5 are respectively and electrically connected to the first antenna a1, the second antenna a2, the third antenna A3, the fourth antenna a4 and the fifth antenna a5, respectively, so as to feed current signals into the first antenna a1, the second antenna a2, the third antenna A3, the fourth antenna a4 and the fifth antenna a 5.

It is understood that when a current enters from the first feeding source F1, the current passes through the first antenna a1, so that the first antenna a1 simultaneously excites the first mode, the second mode and the third mode to generate radiation signals of the first frequency band, the second frequency band and the third frequency band. When a current enters from the second feeding source F2, the current passes through the second antenna a2, so that the second antenna a2 simultaneously excites the second mode and the third mode to generate radiation signals of the second frequency band and the third frequency band. When a current enters from the third feeding source F3, the current passes through the third antenna A3, so that the third antenna A3 simultaneously excites the first mode, the second mode and the third mode to generate radiation signals of the first frequency band, the second frequency band and the third frequency band. When a current enters from the fourth feeding source F4, the current passes through the fourth antenna a4, so that the fourth antenna a4 excites the second mode and the fourth mode to generate radiation signals of the second frequency band and the fourth frequency band. When a current enters from the fifth feeding source F5, the current passes through the fifth antenna a5, so that the fifth antenna a5 excites the third mode to generate a radiation signal of the third frequency band.

It is to be understood that, in this embodiment, the first antenna a1, the second antenna a2, the third antenna A3 and the fourth antenna a4 may constitute a first multiple-input multiple-output (MIMO) antenna to provide 4x4 MIMO of the second frequency band. The first antenna a1, the second antenna a2, the third antenna A3, and the fifth antenna a5 may collectively form a second multiple-input multiple-output antenna to provide 4x4 multiple-input multiple-output for the third frequency band. The first antenna a1 and the third antenna A3 may collectively form a third multiple-input multiple-output antenna to provide 2x2 multiple-input multiple-output for the first frequency band.

In this embodiment, the frequency of the third frequency band is higher than the frequency of the second frequency band, the frequency of the second frequency band is higher than the frequency of the fourth frequency band, and the frequency of the fourth frequency band is higher than the frequency of the first frequency band. Specifically, the first mode is an LTE-a (long Term Evolution advanced) low-frequency mode, and the first frequency band is a 699-960MHz frequency band. The second mode is an LTE-A intermediate frequency mode, and the second frequency range is 1710-2200MHz frequency range or 1805-2200MHz frequency range. The third mode is an LTE-A high-frequency mode, and the third frequency band is 2300-2690MHz frequency band. The fourth mode is a Global Positioning System (GPS) mode, and the fourth frequency band is 1550-.

Referring to fig. 2, in the present embodiment, the antenna structure 100 further includes a first switching circuit 31. The first switching circuit 31 includes a first switch 311 and a plurality of first switching elements 312. The first switch 311 may be a single-pole single-throw switch, a single-pole double-throw switch, a single-pole triple-throw switch, a single-pole four-throw switch, a single-pole six-throw switch, a single-pole eight-throw switch, or the like. The first switch 311 is electrically connected to the first antenna a 1. Each first switching element 312 may be inductive, capacitive, or a combination of inductive and capacitive. The first switching elements 312 are connected in parallel, and one end thereof is electrically connected to the first switch 311, and the other end thereof is electrically connected to the first grounding point G1, i.e. the ground. Each first switching element 312 has different impedance, and by controlling the switching of the first switch 311, the first switch 311 is switched to a different first switching element 312, so as to adjust the first frequency band of the first antenna a 1. For example, the plurality of first switching elements 312 may include five inductors connected in parallel, and the inductance values of the five inductors are 10nH, 13nH, 18nH, 23nH, and 30nH, respectively.

Referring to fig. 3, in the present embodiment, the antenna structure 100 further includes a second switching circuit 32. The second switching circuit 32 includes a second switch 321 and a plurality of second switching elements 322. The second switch 321 may be a single-pole single-throw switch, a single-pole double-throw switch, a single-pole triple-throw switch, a single-pole four-throw switch, a single-pole six-throw switch, a single-pole eight-throw switch, or the like. The second switch 321 is electrically connected to the third antenna a 3. Each of the second switching elements 322 may be an inductor, a capacitor, or a combination of an inductor and a capacitor. The second switching elements 322 are connected in parallel, and one end thereof is electrically connected to the second switch 321, and the other end thereof is electrically connected to the second grounding point G2, i.e. the ground. Each second switching element 322 has different impedance, and the second switching element 321 is switched to a different second switching element 322 by controlling the switching of the second switching switch 321, so as to adjust the first frequency band of the third antenna a 3.

In this embodiment, the antenna structure 100 further includes a third switching circuit 33 and a connection portion 34. The connecting portion 34 is electrically connected between the second feeding source F2 and the second antenna a 2. One end of the third switching circuit 33 is electrically connected to the third grounding point G3, i.e., to ground. The other end of the third switching circuit 33 is electrically connected to the connection portion 34. The connection portion 34 may be a wire formed by a wire on a Flexible Printed Circuit (FPC) or by Laser Direct Structure (LDS). The third switching circuit 33 is a short circuit (short circuit) when the mimo function is turned off, and is an open circuit (open circuit) when the mimo function is turned on. The third switching circuit 33 is used to electrically connect the output terminal of the second feeding source F2 to the third grounding point G3, i.e. to ground, when the mimo function is turned off, so as to avoid the influence of the radiated signal of the first antenna a 1.

Fig. 4 is a graph of S-parameters (scattering parameters) of the first antenna a1 operating in LTE-a low, medium, and high frequency modes. Obviously, when the first switch 311 in the first switching circuit 31 is switched to different first switching elements 312 (for example, the first switching elements 312 with inductance values of 10nH, 13nH, 18nH, 23nH, and 30nH, respectively), the first switching elements 312 have different impedances, and thus the low frequency band of the first antenna can be effectively adjusted by switching the first switch 311. The curve S501 is an S-parameter (scattering parameter) graph when the first switch 311 is switched to the first switching element 312 with an inductance value of 10nH, and the first antenna a1 operates in the LTE-a low, medium, and high frequency modes. Curve S502 is a graph of the S parameter (scattering parameter) when the first switch 311 is switched to the first switching element 312 with an inductance value of 13nH, and the first antenna a1 operates in the LTE-a low, medium and high frequency mode. Curve S503 is a graph of S parameter (scattering parameter) when the first switch 311 is switched to the first switching element 312 with inductance value of 30nH, and the first antenna a1 operates in the LTE-a low, medium and high frequency mode. Curve S504 is a graph of the S parameter (scattering parameter) when the first switch 311 is switched to the first switching element 312 with an inductance value of 23nH, and the first antenna a1 operates in the LTE-a low, medium and high frequency mode. Curve S505 is a graph of the S parameter (scattering parameter) when the first switch 311 is switched to the first switching element 312 with an inductance value of 30nH, and the first antenna a1 operates in the LTE-a low, medium and high frequency mode. The curve S506 is a Voltage Standing Wave Ratio (VSWR) of the first antenna a 1.

Fig. 5 is a radiation efficiency graph of the first antenna a1 when operating in the LTE-a low frequency mode. The curve S601 is a radiation efficiency diagram when the first switch 311 is switched to the first switching element 312 with an inductance value of 10nH, and the first antenna a1 operates in the LTE-a low-frequency mode. Curve S602 is a radiation efficiency diagram when the first switch 311 is switched to the first switching element 312 with an inductance value of 13nH, and the first antenna a1 operates in the LTE-a low-frequency mode. Curve S603 is a radiation efficiency diagram when the first switch 311 is switched to the first switching element 312 with an inductance value of 18nH, and the first antenna a1 operates in the LTE-a low-frequency mode. Curve S604 is a radiation efficiency diagram when the first switch 311 is switched to the first switching element 312 with an inductance value of 23nH, and the first antenna a1 operates in the LTE-a low-frequency mode. Curve S605 is a radiation efficiency diagram of the first antenna a1 operating in the LTE-a low frequency mode when the first switch 311 is switched to the first switching element 312 with an inductance value of 30 nH.

Fig. 6 is a radiation efficiency diagram of the first antenna a1 when operating in the high frequency mode in LTE-a. The curve S701 is a radiation efficiency diagram when the first switch 311 is switched to the first switching element 312 with an inductance value of 10nH, and the first antenna a1 operates in the high-frequency mode in LTE-a. A curve S702 is a radiation efficiency diagram when the first switch 311 is switched to the first switching element 312 with an inductance value of 13nH, and the first antenna a1 operates in the LTE-a high-frequency mode. Curve S703 is a radiation efficiency diagram of the first antenna a1 operating in the LTE-a low frequency mode when the first switch 311 is switched to the first switching element 312 with an inductance value of 18 nH. Curve S704 is a radiation efficiency diagram when the first switch 311 is switched to the first switching element 312 with an inductance value of 23nH, and the first antenna a1 operates in the LTE-a high-frequency mode. A curve S705 is a radiation efficiency diagram when the first switch 311 is switched to the first switching element 312 with an inductance value of 30nH, and the first antenna a1 operates in the high-frequency mode in LTE-a.

Fig. 7 is a graph of S-parameters (scattering parameters) of the second antenna a2 when operating in the high-frequency mode in LTE-a.

Fig. 8 is a radiation efficiency diagram of the second antenna a2 when operating in the high frequency mode in LTE-a.

Fig. 9 is a graph of S-parameters (scattering parameters) of the third antenna a3 when operating in LTE-a low, medium, and high frequency modes. The curve S1001 is a graph of an S parameter (scattering parameter) when the third antenna a3 operates in a 700MHz frequency band and a high-frequency mode in LTE-a. The curve S1002 is a graph of S parameters (scattering parameters) when the third antenna a3 operates in the 850MHz frequency band and the LTE-a high frequency mode. The curve S1003 is a graph of an S parameter (scattering parameter) when the third antenna a3 operates in a 900MHz frequency band and a high frequency mode in LTE-a.

Fig. 10 is a radiation efficiency diagram of the third antenna a3 when operating in LTE-a low, medium, and high frequency modes. The curve S1101 is a radiation efficiency diagram of the third antenna a3 when operating in the B28 frequency band and the high frequency mode in LTE-a. A curve S1102 is a radiation efficiency diagram of the third antenna a3 operating in the B13 frequency band and the LTE-a medium-high frequency mode. A curve S1103 is a radiation efficiency diagram of the third antenna a3 when operating in the B20/B5 frequency band and the high frequency mode in LTE-a. A curve S1104 is a radiation efficiency diagram of the third antenna a3 operating in the B8 frequency band and the high frequency mode in LTE-a.

Fig. 11 is a graph of S-parameters (scattering parameters) of the fourth antenna a4 operating in LTE-a intermediate frequency mode and GPS mode.

Fig. 12 is a graph of the total radiation efficiency of the fourth antenna a4 when operating in the LTE-a intermediate frequency mode and the GPS mode.

Fig. 13 is a graph of S-parameters (scattering parameters) of the fifth antenna a5 when operating in the LTE-a high-frequency mode.

Fig. 14 is a graph of the total radiation efficiency of the fifth antenna a5 when operating in the LTE-a high-frequency mode.

It is appreciated that in another embodiment, as shown in fig. 15, the antenna structure 100 further includes a sixth antenna a 6. The portion of the metal frame 111 between the first disconnection point 13 and the fourth disconnection point 16 near the first antenna a1 forms the sixth antenna a 6. The sixth antenna a6 and the second antenna a2 have the same structure. The sixth antenna a6 and the second antenna a2 are symmetrically disposed with respect to the first antenna a 1. Specifically, the antenna structure 100 further includes a sixth feeding source F6, a fourth grounding point G4, a fourth switching circuit 35, and a junction 36. The junction 36 is electrically connected between the sixth feeding source F6 and the sixth antenna a 6. One end of the fourth switching circuit 35 is electrically connected to the fourth grounding point G4, i.e., to ground. The other end of the fourth switching circuit 35 is electrically connected to the junction 36. The commissures 36 may be a length of wire formed from wire on a flexible circuit board or laser formed. The sixth antenna a6 may be used to cover radiated signals in other frequency bands, for example, the 1.5GHz ultra-intermediate frequency band or the wifi2.4GHz band.

As described in the foregoing embodiments, the antenna structure 100 is formed by opening the first breaking point 13, the second breaking point 14, the third breaking point 15, and the fourth breaking point 16 on the metal frame 111. First breakpoint 13, second breakpoint 14, third breakpoint 15 and fourth breakpoint 16 certainly metal frame 111 marks off first antenna A1, second antenna A2, third antenna A3 and fourth antenna A4, in addition inside casing 11 fifth antenna A5 makes antenna structure 100 frequency channel coverage is great, can cover to LTE-A low, medium and high frequency channel, GPS frequency channel and WIFI2.4GHz frequency channel, and the frequency range is wider. And the first antenna a1, the second antenna a2, the third antenna A3, and the fourth antenna a4 may collectively form a first multiple-input multiple-output antenna. The first antenna a1, the second antenna a2, the third antenna A3, and the fifth antenna a5 may collectively form a second multiple-input multiple-output antenna. The first antenna a1 and the third antenna A3 may collectively form a third multiple-input multiple-output antenna. The three mimo antennas may provide 2x2 and 4x4 mimo functions.

Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention. Those skilled in the art can also make other changes and the like in the design of the present invention within the spirit of the present invention as long as they do not depart from the technical effects of the present invention. Such variations are intended to be included within the scope of the invention as claimed.