CN107634314B

CN107634314B - Antenna structure and wireless communication device with same

Info

Publication number: CN107634314B
Application number: CN201710518152.4A
Authority: CN
Inventors: 李承翰; 许溢文; 叶维轩
Original assignee: Shenzhen Futaihong Precision Industry Co Ltd; Chiun Mai Communication Systems Inc
Current assignee: Shenzhen Futaihong Precision Industry Co Ltd; Chiun Mai Communication Systems Inc
Priority date: 2016-07-19
Filing date: 2017-06-29
Publication date: 2020-12-08
Anticipated expiration: 2037-06-29
Also published as: TW201804669A; CN206098677U; CN107634314A; TW201804672A; CN107634311A; TW201804667A; TWI626786B; TWI651887B; TWI651888B; TW201806232A; TWM559003U; CN205960191U; TWI650902B; CN107634305A; TW201806239A; TW201804666A; CN107634310A; CN107634316A; TWI640126B; TWM556941U

Abstract

The invention provides an antenna structure, which comprises a shell, a first feed-in source and a first radiating body, wherein the shell comprises a front frame, a back plate and a frame, a slot is formed in the frame, a breakpoint is formed in the front frame, the breakpoint is communicated with the slot and extends to block the front frame, the slot and the breakpoint divide a metal long arm and a metal short arm from the shell, the first radiating body is arranged in the shell and comprises a first radiating part and a second radiating part, one end of the first radiating part is electrically connected to the first feed-in source, and the other end of the first radiating part is in spaced coupling arrangement with the metal long arm; one end of the second radiation part is electrically connected to the first feed-in source, and the other end of the second radiation part is coupled with the short metal arm at intervals. The back plate in the antenna structure forms an all-metal structure, and the influence on the integrity and the attractiveness of the back plate due to the arrangement of grooves, broken lines or breakpoints can be effectively avoided. The invention also provides a wireless communication device with the antenna structure.

Description

Antenna structure and wireless communication device with same

Technical Field

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

Background

With the progress of wireless communication technology, wireless communication devices are increasingly being developed to be light and thin, and consumers have increasingly high requirements for product appearance. Since the metal housing has advantages in terms of appearance, mechanical strength, heat dissipation effect, etc., more and more manufacturers design wireless communication devices having metal housings, such as metal back plates, to meet the needs of consumers. However, the metal housing is likely to interfere with and shield signals radiated by the antenna disposed therein, and it is not easy to achieve a broadband design, resulting in poor radiation performance of the internal antenna. Furthermore, the back plate is usually provided with slots and breakpoints, which affect the integrity and the aesthetic property of the back plate.

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 shell, a first feed-in source and a first radiating body, wherein the shell comprises a front frame, a back plate and a frame, the frame is clamped between the front frame and the back plate, a groove is formed in the frame, a breakpoint is formed in the front frame, the breakpoint is communicated with the groove and extends to the front frame in a partition mode, a metal long arm and a metal short arm are divided from the shell by the groove and the breakpoint, the first radiating body is arranged in the shell and comprises a first radiating portion and a second radiating portion, one end of the first radiating portion is electrically connected to the first feed-in source, and the other end of the first radiating portion is in spaced coupling with the metal long arm; one end of the second radiation part is electrically connected to the first feed-in source, and the other end of the second radiation part is coupled with the short metal arm at intervals.

A wireless communication device comprises the antenna structure.

The antenna structure and the wireless communication device with the antenna structure can cover low frequency (LTE Band17/13/5/8), medium frequency (1710-. In addition, the slots and the breakpoints on the shell of the antenna structure are arranged on the front frame and the side frame and are not arranged on the back plate, so that the back plate forms an all-metal structure, namely, the back plate is not provided with insulated slots, broken lines or breakpoints, and the situation that the integrity and the attractiveness of the back plate are influenced by the arrangement of the slots, the broken lines or the breakpoints can be avoided.

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 an assembly diagram of the wireless communication device shown in fig. 1.

Fig. 3 is an assembly view of the wireless communication device shown in fig. 2 from another angle.

Fig. 4 is a circuit diagram of a first switching circuit in the antenna structure shown in fig. 1.

Fig. 5 is a circuit diagram of the first switching circuit shown in fig. 4 provided with a resonant circuit.

Fig. 6 is another circuit diagram of the first switching circuit shown in fig. 4 provided with a resonant circuit.

Fig. 7 is an operation diagram of a narrow-band mode generated when the first switching circuit shown in fig. 5 is provided with a resonant circuit.

Fig. 8 is an operation diagram of a narrow-band mode generated when the first switching circuit shown in fig. 6 is provided with a resonant circuit.

Fig. 9 is a current trace diagram of the antenna structure shown in fig. 1 operating in a low frequency mode and a GPS mode.

Fig. 10 is a schematic diagram of a current trend of the antenna structure shown in fig. 1 operating in the 1710-2690MHz frequency band.

Fig. 11 is a graph of S-parameters (scattering parameters) of the antenna structure shown in fig. 1 operating in a low frequency mode and a GPS mode.

Fig. 12 is a radiation efficiency graph of the antenna structure shown in fig. 1 operating in a low frequency mode.

Fig. 13 is a radiation efficiency graph of the antenna structure shown in fig. 1 operating in the GPS mode.

Fig. 14 is a graph of S-parameters (scattering parameters) when the antenna structure shown in fig. 1 operates in the 1710-2690MHz frequency band.

Fig. 15 is a radiation efficiency graph of the antenna structure shown in fig. 1 operating in the 1710-2690MHz frequency band.

Fig. 16 is a schematic structural diagram of an antenna structure according to a second preferred embodiment of the present invention.

Fig. 17 to 19 are schematic diagrams illustrating a positional relationship of the isolation portion in the antenna structure shown in fig. 16.

Fig. 20 is a schematic diagram of a current profile of the antenna structure shown in fig. 16 when the antenna structure operates in a high-frequency mode.

Fig. 21 is a schematic view of a current trend of the antenna structure shown in fig. 16 when the antenna structure operates in a dual-frequency WIFI mode.

Fig. 22 is a graph of S-parameters (scattering parameters) for the antenna structure of fig. 16 operating in the middle-frequency mode and the high-frequency mode.

Fig. 23 is a radiation efficiency graph of the antenna structure shown in fig. 16 operating in a medium-frequency mode and a high-frequency mode.

Fig. 24 is a graph illustrating S parameters (scattering parameters) of the antenna structure shown in fig. 16 when the antenna structure operates in the WIFI 2.4GHZ mode and the WIFI 5GHZ mode.

Fig. 25 is a radiation efficiency graph of the antenna structure shown in fig. 16 operating in the WIFI 2.4GHZ mode.

Fig. 26 is a radiation efficiency graph of the antenna structure shown in fig. 16 operating in the WIFI 5GHz mode.

Fig. 27 is a diagram illustrating an antenna structure applied to a wireless communication device according to a third preferred embodiment of the present invention.

Fig. 28 is an assembly diagram of the wireless communication device shown in fig. 27.

Fig. 29 is an assembly view of the wireless communication device of fig. 28 from another angle.

Fig. 30 is a circuit diagram of a first switching circuit in the antenna structure shown in fig. 27.

Fig. 31 is a circuit diagram of a second switching circuit in the antenna structure shown in fig. 27.

Fig. 32 is a current-carrying diagram of the antenna structure shown in fig. 27.

Fig. 33 is a circuit diagram of the first switching circuit shown in fig. 30 provided with a resonance circuit.

Fig. 34 is another circuit diagram of the first switching circuit shown in fig. 30 provided with a resonance circuit.

Fig. 35 is an operation diagram of a narrow-band mode generated when the first switching circuit shown in fig. 33 is provided with a resonance circuit.

Fig. 36 is an operation principle diagram for generating a narrow-band mode when the first switching circuit shown in fig. 34 is provided with a resonance circuit.

Fig. 37 is a current-carrying diagram of the antenna structure of fig. 27 in a low-frequency mode of operation with a resonant circuit.

Fig. 38 is a schematic diagram of a current trend when the antenna structure shown in fig. 27 is provided with the resonant circuit and operates in the 1710-2690MHz frequency band.

Fig. 39 is a graph of the S-parameter (scattering parameter) of the antenna structure of fig. 27 operating in the low frequency mode.

Fig. 40 is a graph of the radiation efficiency of the antenna structure of fig. 27 operating in the low frequency mode.

Fig. 41 is a graph of S-parameters (scattering parameters) when the antenna structure shown in fig. 27 operates in the 1710-2690MHz frequency band.

Fig. 42 is a radiation efficiency diagram of the antenna structure shown in fig. 27 operating in the 1710-2690MHz band.

Fig. 43 is a schematic structural diagram of an antenna structure according to a fourth preferred embodiment of the invention.

Fig. 44 is a schematic diagram of a current trend of the antenna structure shown in fig. 43 when the antenna structure operates in the 1710-2400MHz frequency band.

Fig. 45 is a schematic view of a current trend of the antenna structure shown in fig. 43 when operating in the dual-frequency WIFI mode.

Fig. 46 is a schematic diagram of a current trend of the antenna structure shown in fig. 43 operating in the frequency bands of 2496-2690 MHz.

Fig. 47 is a graph of S-parameters (scattering parameters) when the antenna structure shown in fig. 43 operates in the 1710-2400MHz frequency band.

Fig. 48 is a radiation efficiency diagram of the antenna structure shown in fig. 43 operating in the 1710-2400MHz frequency band.

Fig. 49 is a graph of S-parameters (scattering parameters) of the antenna structure shown in fig. 43 operating in the WIFI 2.4GHZ mode and the WIFI 5GHZ mode.

Fig. 50 is a radiation efficiency diagram of the antenna structure shown in fig. 43 operating in the WIFI 2.4GHZ mode and the WIFI 5GHZ mode.

Fig. 51 is a graph of S-parameters (scattering parameters) when the antenna structure shown in fig. 43 operates in the 2496-2690MHz frequency band.

Fig. 52 is a radiation efficiency graph of the antenna structure shown in fig. 43 operating in the frequency bands of 2496-2690 MHz.

Fig. 53 is a schematic structural diagram of an antenna structure according to a fifth preferred embodiment of the invention.

Fig. 54 is a schematic diagram of a current profile of the antenna structure shown in fig. 53 operating in 1710-2170MHz band.

Fig. 55 is a schematic diagram of the current trend of the antenna structure shown in fig. 53 operating in the frequency ranges of 2300-.

FIG. 56 is a graph of S-parameters (scattering parameters) for the antenna structure of FIG. 53 operating in the 1710-2170MHz band.

Fig. 57 is a graph of the radiation efficiency of the antenna structure of fig. 53 operating in the 1710-2170MHz frequency band.

Fig. 58 is a graph of S-parameters (scattering parameters) when the antenna structure shown in fig. 53 operates in the 2300-.

Fig. 59 is a radiation efficiency diagram of the antenna structure shown in fig. 53 operating in the 2300-.

Fig. 60 is a schematic diagram illustrating an antenna structure applied to a wireless communication device according to a sixth preferred embodiment of the invention.

Fig. 61 is an assembly diagram of the wireless communication device shown in fig. 60.

Fig. 62 is an assembly view of the wireless communication device shown in fig. 61 from another angle.

Fig. 63 is a circuit diagram of a first switching circuit in the antenna structure shown in fig. 60.

Fig. 64 is a circuit diagram of a second switching circuit in the antenna structure shown in fig. 60.

Fig. 65 is a circuit diagram of the first switching circuit shown in fig. 63 provided with a resonance circuit.

Fig. 66 is another circuit diagram of the first switching circuit shown in fig. 63 provided with a resonance circuit.

Fig. 67 is an operation diagram of a narrow-band mode generated when the first switching circuit shown in fig. 65 is provided with a resonance circuit.

Fig. 68 is an operation principle diagram for generating a narrow-band mode when the first switching circuit shown in fig. 66 is provided with a resonance circuit.

Fig. 69 is a schematic diagram of the current flow of the antenna structure shown in fig. 60 operating in the low frequency mode.

Fig. 70 is a schematic diagram of the current flow of the antenna structure shown in fig. 60 operating in the mid-frequency mode.

Fig. 71 is a schematic view of the current flow of the antenna structure shown in fig. 60 operating in a high-frequency mode.

Fig. 72 is a graph of the S-parameter (scattering parameter) for the antenna structure of fig. 60 operating in the low frequency mode.

Fig. 73 is a graph of the radiation efficiency of the antenna structure of fig. 60 operating in the low frequency mode.

Fig. 74 is a graph of S-parameters (scattering parameters) for the antenna structure of fig. 60 operating in the mid-frequency mode.

Fig. 75 is a graph of the radiation efficiency of the antenna structure of fig. 60 operating in the mid-frequency mode.

Fig. 76 is a graph of the S-parameter (scattering parameter) for the antenna structure of fig. 60 operating in the high frequency mode.

Fig. 77 is a graph of radiation efficiency for the antenna structure of fig. 60 operating in a high frequency mode.

Fig. 78 is a schematic structural diagram of an antenna structure according to a seventh preferred embodiment of the invention.

Fig. 79 is a schematic diagram of a current profile of the antenna structure shown in fig. 78 operating in a mid-frequency mode.

Fig. 80 is a graph of the S-parameter (scattering parameter) for the antenna structure of fig. 78 operating in the low frequency mode.

Fig. 81 is a graph of the radiation efficiency of the antenna structure of fig. 78 operating in the low frequency mode.

Fig. 82 is a graph of the S-parameter (scattering parameter) of the antenna structure of fig. 78 operating in the mid-frequency mode.

Fig. 83 is a radiation efficiency graph of the antenna structure of fig. 78 operating in the mid-frequency mode.

Description of the main elements

The following detailed description will further illustrate the invention in conjunction with the above-described figures.

Detailed Description

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

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

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

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

Examples 1 to 2

Referring to fig. 1, a first preferred embodiment of the present invention provides an antenna structure 100, which can be applied to a wireless communication device 400, such as a mobile phone, a personal digital assistant, etc., for transmitting and receiving radio waves to transmit and exchange wireless signals.

Referring to fig. 2 and fig. 3, the antenna structure 100 includes a metal element 11, a first feeding source 13, a second feeding source 14, and a first switching circuit 15. The metal piece 11 may be a housing of the wireless communication device 400. The metal component 11 includes a metal front frame 111, a metal back plate 112 and a metal frame 113. The metal front frame 111, the metal back plate 112 and the metal frame 113 may be integrally formed. The metal front frame 111, the metal back plate 112 and the metal bezel 113 constitute a housing of the wireless communication device 400. The metal front frame 111 is provided with an opening (not shown) for accommodating the display unit 401 of the wireless communication device 400. It is understood that the display unit 401 has a display plane exposed in the opening, and the display plane is disposed substantially parallel to the metal backplate 112.

The metal back plate 112 is disposed opposite to the metal front frame 111. The metal back plate 112 is a single metal sheet formed integrally, and has no insulating slot, broken line or break point (see fig. 3) except for the

openings

404 and 405 for exposing the camera lens 402, the flash lamp 403 and other elements. The metal back plate 112 is equivalent to the ground of the antenna structure 100.

The metal frame 113 is sandwiched between the metal front frame 111 and the metal back plate 112, and is respectively disposed around the peripheries of the metal front frame 111 and the metal back plate 112 to form an accommodating space 114 together with the display unit 401, the metal front frame 111, and the metal back plate 112. The accommodating space 114 is used for accommodating electronic components or circuit modules of the wireless communication device 400, such as a circuit board, a processing unit, and the like.

The metal bezel 113 includes at least a top 115, a first side 116, and a second side 117. The top 115 connects the metal front frame 111 and the metal back plate 112. The first side portion 116 and the second side portion 117 are disposed opposite to each other, and are disposed at two ends of the top portion 115, preferably vertically. The first side portion 116 and the second side portion 117 are also connected to the metal front frame 111 and the metal back plate 112. The metal frame 113 is further provided with a slot 118, and the metal front frame 111 is provided with a break point 119. In the present embodiment, the slot 118 is disposed on the top portion 115 and extends to the first side portion 116 and the second side portion 117, respectively. It is understood that, in other embodiments, the slot 118 may be disposed only on the top portion 115 and not extend to any one of the first side portion 116 and the second side portion 117, or the slot 118 may be disposed on the top portion 115 and only extend to one of the first side portion 116 and the second side portion 117. The break point 119 is communicated with the slot 118 and extends to block the metal front frame 111. In the present embodiment, the break point 119 is disposed adjacent to the second side 117, so that the break point 119 divides the metal front frame 111 into two parts, namely, a metal long arm a1 and a metal short arm a 2. The metal front frame 111 on one side of the break point 119 and the part thereof extending to the position corresponding to one of the end points E1 of the slot 118 together form the metal long arm a 1. The metal front frame 111 on the other side of the break point 119 forms the metal short arm a2 until the part thereof extending to the other end point E2 of the slot 118. In this embodiment, the position where the break point 119 is opened does not correspond to the middle of the top 115, so the length of the metal long arm a1 is greater than the length of the metal short arm a 2. In addition, the slots 118 and the break points 119 are filled with insulating materials (for example, plastics, rubber, glass, wood, ceramics, etc., but not limited thereto), so as to separate the metal long arm a1, the metal short arm a2 and the metal back plate 112.

It can be understood that there are no other insulated slots, breaks or breakpoints on the upper half portions of the metal front frame 111 and the metal frame 113 except for the slot 118 and the break point 119, so there is only one break point 119 on the upper half portion of the metal front frame 111 and no other break points.

The first feeding source 13 can be electrically connected to one end of the metal long arm a1 near the first side 116 through a matching circuit (not shown), so as to feed current into the metal long arm a1, so that the metal long arm a1 excites a first mode to generate a radiation signal in a first frequency band. In this embodiment, the first mode is a low frequency mode, and the first frequency band is 700-900MHz frequency band.

The second feeding source 14 can be electrically connected to one end of the short metal arm a2 near the break point 119 through a matching circuit (not shown), so as to feed current into the short metal arm a2, so that the short metal arm a2 excites two corresponding modes, which form a broadband resonance application (i.e., 1710-.

Referring to fig. 4, the first switching circuit 15 is electrically connected to the metal long arm a1, and includes a switching unit 151 and at least one switching element 153. The switching element 153 may be an inductor, a capacitor, or a combination of an inductor and a capacitor. The switching elements 153 are connected in parallel, and one end of each switching element is electrically connected to the switching unit 151, and the other end of each switching element is electrically connected to the metal backplate 112. In this way, by controlling the switching of the switching unit 151, the metal long arm a1 can be switched to a different switching element 153. Since each switching element 153 has different impedance, the frequency band of the first mode of the metal long arm a1 can be adjusted by switching of the switching unit 151. The frequency band is adjusted to shift towards low frequency or high frequency.

It is understood that, referring to fig. 5 and fig. 6 together, the first switching circuit 15 may further include a resonant circuit 155. Referring to fig. 5, in one embodiment, the number of the resonant circuits 155 is one, and the resonant circuits 155 include an inductor L and a capacitor C connected in series. The resonant circuit 155 is electrically connected between the metal long arm a1 and the metal back plate 112, and is disposed in parallel with the switching unit 151 and at least one switching element 153.

Referring to fig. 6, in another embodiment, the number of the resonant circuits 155 is the same as the number of the switching elements 153, i.e., is plural. Each resonant circuit 155 includes an inductor L and a capacitor C connected in series. Each of the resonant circuits 155 is electrically connected between the switching unit 151 and the metal backplate 112, and is disposed in parallel with the corresponding switching element 153.

Fig. 7 is a schematic diagram showing the relationship between the S-parameter (scattering parameter) and the frequency when one resonant circuit 155 is connected in parallel to the switching unit 151 of the first switching circuit 15 shown in fig. 5. It is assumed that the antenna structure 100 operates in the first mode (see the curve S51) when the resonant circuit 155 shown in fig. 4 is not added to the first switching circuit 15. When the resonant circuit 155 is added to the first switching circuit 15, the resonant circuit 155 can make the metal long arm a1 resonate additionally to form a narrow-band mode (the second mode, please refer to the curve S52) to generate a radiation signal of the second frequency band, which can effectively increase the application frequency band of the antenna structure 100, thereby achieving multi-frequency or wideband application. In an embodiment, the second frequency band may be a GPS frequency band, and the second mode is a GPS resonance mode.

Fig. 8 is a schematic diagram showing the relationship between the S-parameter (scattering parameter) and the frequency when a resonant circuit 155 is connected in parallel to one side of each switching element 153 in the first switching circuit 15 shown in fig. 6. It is assumed that the antenna structure 100 can operate in the first mode (see curve S61) when the resonant circuit 155 shown in fig. 6 is not added to the first switching circuit 15. Thus, when the resonant circuit 155 is added to the first switching circuit 15, the resonant circuit 155 can make the metal long arm a1 resonate in the narrow-band mode (please refer to the curve S62), i.e., the GPS resonant mode, which can effectively increase the application frequency band of the antenna structure 100, thereby achieving multi-band or wideband applications. In addition, by setting the inductance value of the inductor L and the capacitance value of the capacitor C in the resonant circuit 155, the frequency band of the narrow-band mode during the switching of the first mode can be determined. For example, in one embodiment, for example as shown in fig. 8, by setting the inductance and capacitance values in the resonant circuit 155, when the switching unit 151 is switched to different switching elements 153, the narrow-band mode of the antenna structure 100 is also switched accordingly, for example, the mode can be moved from f1 to fn, and the moving range is very wide.

It is understood that, in another embodiment, the frequency band of the narrow-band mode can also be fixed by setting the inductance and capacitance values in the resonant circuit 155, so that the frequency band of the narrow-band mode is fixed no matter which switching element 153 the switching unit 151 switches to.

It is understood that in other embodiments, the resonant circuit 155 is not limited to include the inductor L and the capacitor C, but may be composed of other resonant elements.

Fig. 9 is a schematic view of the current trend of the antenna structure 100 operating in the low frequency mode and the GPS mode. Obviously, when the current enters the metal long arm a1 from the first feeding source 13, the current flows through the metal long arm a1 and flows to the break point 119 (reference path P1), so as to excite the low frequency mode. In addition, since the antenna structure 100 is provided with the first switching circuit 15, the low-frequency mode of the metal long arm a1 can be switched by the first switching circuit 15. Furthermore, due to the arrangement of the resonant circuit 155 in the first switching circuit 15, the low frequency mode and the GPS mode can exist simultaneously. That is, in this embodiment, the current of the GPS mode is contributed by two parts, one of which is the low frequency mode excitation (see path P1), and the other of which is excited after the impedance matching of the inductor L and the capacitor C of the resonant circuit 155 (see path P2). The current of path P2 flows from the end of short metal arm a2 close to the second feed source 14 to the other end of short metal arm a2 away from the second feed source 14.

Fig. 10 is a schematic diagram of a current trend of the antenna structure 100 operating in the 1710-2690MHz frequency band. Obviously, when the current enters the metal short arm a2 from the second feeding source 14, the current sequentially flows through the metal front frame 111, the second side portion 117 and the metal back plate 112 on the back side (refer to path P3), so as to excite the third mode to generate the radiation signal of the third frequency band (i.e. 1710-. As can be seen from fig. 4 and 10, the metal back plate 112 is equivalent to the ground of the antenna structure 100.

Fig. 11 is a graph illustrating S-parameters (scattering parameters) of the antenna structure 100 in the low frequency mode and the GPS mode. The curve S91 is the S11 value when the antenna structure 100 operates in the LTE Band 28 frequency Band (703-803 MHz). The curve S92 is the S11 value when the antenna structure 100 operates in the LTE Band5 Band (869-894 MHz). The curve S93 is the S11 value when the antenna structure 100 operates in the LTE Band8 Band (925 and 926MHz) and the GPS Band (1.575 GHz). Obviously, the curves S91 and S92 correspond to two different frequency bands, and correspond to two of the low frequency modes switchable by the switching circuit 15.

Fig. 12 is a graph of the radiation efficiency of the antenna structure 100 operating in the low frequency mode. The curve 101 is the radiation efficiency of the antenna structure 100 operating in the LTE Band 28 frequency Band (703-803 MHz). The curve S102 shows the radiation efficiency of the antenna structure 100 operating in the LTE Band5 frequency Band (869-. Curve S103 shows the radiation efficiency of the antenna structure 100 operating in the LTE Band8 Band (925-. Obviously, the curves S101, S102 and S103 correspond to three different frequency bands respectively, and correspond to three of the plurality of low frequency modes switchable by the switching circuit 15 respectively.

Fig. 13 is a radiation efficiency graph of the antenna structure 100 operating in the GPS mode. Fig. 14 is a graph of S parameters (scattering parameters) when the antenna structure 100 operates in 1710-. Fig. 15 is a radiation efficiency graph of the antenna structure 100 operating in 1710-2690MHz frequency bands (i.e., the intermediate frequency, the high frequency, and the WIFI 2.4GHz frequency band).

It is obvious from fig. 11 to fig. 15 that the antenna structure 100 can operate in the corresponding low frequency bands, such as the LTE Band 28 Band (703-. In addition, the antenna structure 100 can also work in the GPS frequency band (1.575GHz) and 1710-2690MHz frequency band, i.e. covering to low, medium and high frequencies, and the frequency range is wider, and when the antenna structure 100 works in the above frequency band, the working frequency can satisfy the antenna working design requirement and has better radiation efficiency.

Referring to fig. 16, an antenna structure 200 according to a second preferred embodiment of the present invention is shown. The antenna structure 200 includes a metal member 11, a first feeding source 13, a second feeding source 14, and a first switching circuit 15. The metal component 11 includes a metal front frame 111, a metal back plate 112 and a metal frame 113. The metal bezel 113 includes at least a top 115, a first side 116, and a second side 117. The metal frame 113 is further provided with a slot 118, and the metal front frame 111 is further provided with a break point 119. The break point 119 divides the metal front frame 111 into two parts, which respectively include a metal long arm a1 and a metal short arm a 2.

It is understood that the antenna structure 200 is different from the antenna structure 100 in that the antenna structure 200 further includes a first radiator 26, a third feeding source 27, an isolation portion 28, a second switching circuit 29, a second radiator 30, and a fourth feeding source 31.

The first radiator 26 is disposed in the accommodating space 114 surrounded by the metal piece 11, is disposed adjacent to the metal short arm a2, and is disposed at an interval from the metal back plate 112. In the present embodiment, the first radiator 26 is substantially a straight bar, and is disposed parallel to the top 215. One end of the first radiator 26 is connected to the isolation portion 28, and the other end extends toward the first side portion 116. The third feeding source 27 has one end electrically connected to the first radiator 26 through a matching circuit (not shown), and the other end electrically connected to the isolation portion 28 for feeding current to the first radiator 26.

It can be understood that, in the present embodiment, since the frequency bands of the respective resonances of the second feed source 14 and the third feed source 27 are relatively close, the antenna isolation is liable to be disturbed. Therefore, the isolation portion 28 is used to extend the structural current paths of the two feeding sources, i.e., the second feeding source 14 and the third feeding source 27, so as to improve the isolation between the metal short arm a2 and the first radiator 26.

It is understood that the isolation portion 28 can be any shape and size, or a planar metal sheet, and it is only necessary to ensure that the isolation portion 28 can extend the structural current paths of the second feeding source 14 and the third feeding source 27 to increase the isolation between the metal short arm a2 and the first radiator 26. For example, in the present embodiment, the isolation portion 28 is a block shape, which is disposed on the metal back plate 112 and is formed by extending the second side portion 117 toward the first side portion 116.

It is understood that, referring to fig. 17, in other embodiments, the antenna structure 200 further includes a metal frame 32. The metal frame 32 is disposed in the accommodating space 114 and connected to the metal member 11. The isolation portion 28 is disposed on the metal back plate 112, extends from the second side portion 117 toward the first side portion 116, and is connected to the metal frame 32.

It is understood that, referring to fig. 18, in other embodiments, the antenna structure 200 further includes a metal frame 32. The metal frame 32 is disposed in the accommodating space 114 and connected to the metal member 11. The spacer 28 is provided on the metal back plate 112, is formed by extending the second side portion 117 toward the first side portion 116, and is spaced apart from the metal frame 32.

It is understood that, referring to fig. 19, in other embodiments, the antenna structure 200 further includes a metal frame 32. The metal frame 32 is disposed in the accommodating space 114 and connected to the metal member 11. The spacer 28 is a rectangular plate, and is disposed on one side of the metal frame 32, and spaced apart from the second side 117 and the metal back plate 112.

Referring to fig. 16 again, one end of the second switching circuit 29 is electrically connected to the first radiator 26, and the other end is connected to the metal back plate 112. The second switching circuit 29 is used for adjusting the frequency band of the high-frequency mode of the first radiator 26, and the specific circuit structure and the working principle thereof can refer to the description of the first switching circuit 15 in fig. 4, which is not described herein again.

It is understood that the second radiator 30 includes a first radiation portion 301 and a second radiation portion 302. The first radiation portion 301 is substantially U-shaped, and includes a first radiation section 303, a second radiation section 304, and a third radiation section 305 that are electrically connected in sequence. The first radiating section 303 is substantially in the shape of a straight bar and is disposed parallel to the top 215. The second radiating section 304 is a straight strip, one end of the second radiating section is vertically connected to the end of the first radiating section 303 close to the second side 117, and the other end of the second radiating section extends in a direction parallel to the second side 117 and close to the top 215, so as to form an L-shaped structure with the first radiating section 303. The third radiation section 305 is substantially rectangular and has one end connected to one end of the second radiation section 304 away from the first radiation section 303, and the other end extending along a direction parallel to the first radiation section 303 and close to the first side 116, that is, the third radiation section 305 and the first radiation section 303 are respectively disposed on the same side of the second radiation section 304 and are respectively disposed at two ends of the second radiation section 304.

The second radiation portion 302 is substantially T-shaped and includes a first connection segment 306, a second connection segment 307 and a third connection segment 308. The first connecting segment 306 is substantially rectangular and has one end electrically connected to the end of the first radiating segment 303 away from the second radiating segment 304, and the other end extending in a direction parallel to the second radiating segment 304 and close to the third radiating segment 305. The second connecting segment 307 is substantially a straight strip, one end of which is vertically connected to the end of the first connecting segment 306 away from the first radiating segment 303, and the other end of which extends in a direction parallel to the first radiating segment 303 and close to the second radiating segment 304. The third connecting section 308 is substantially in the shape of a straight bar, is connected to the connection point of the first connecting section 306 and the second connecting section 307, and extends along a direction parallel to the first radiating section 303 and close to the first side portion 116, so as to be located on the same straight line with the second connecting section 307 until being connected to the front metal frame 111 in front of the first side portion 116.

The fourth feeding source 31 is disposed on the metal front frame 111, and is electrically connected to a connection point of the first radiation section 303 and the first connection section 306, so as to feed current to the first radiation portion 301 and the second radiation portion 302, respectively, and further excite corresponding working modes, such as a WIFI 2.4GHz mode and a WIFI 5GHz mode.

It can be understood that when the antenna structure 200 operates in the low-frequency mode and the GPS mode, the current direction of the antenna structure is consistent with the current direction of the antenna structure 100 operating in the low-frequency mode and the GPS mode, which is specifically referred to fig. 9 and will not be described herein again.

It can be understood that, when the antenna structure 200 operates in the intermediate frequency mode, the current direction of the antenna structure 200 is consistent with the current direction of the antenna structure 100 operating in the 1710-2690MHz frequency band, which is specifically referred to fig. 10 and will not be described herein again.

Please refer to fig. 20, which is a schematic diagram of a current trend of the antenna structure 200 in the high frequency mode. Obviously, after the current enters the first radiator 26 from the third feeding source 27, the current flows to the end of the first radiator 26 away from the third feeding source 27 (refer to path P4), and a fourth mode is excited to generate a radiation signal of a fourth frequency band. The fourth mode of the present embodiment is a high frequency mode. In addition, since the antenna structure 200 is provided with the grounded second switching circuit 29, the high-frequency mode can be switched by using the second switching circuit 29, for example, the antenna structure 200 can be switched to the LTE Band 40 (2300 Band 2400MHz) or the LTE Band41 (2496 Band 2690MHz) and the high-frequency mode and the intermediate-frequency mode exist at the same time.

Fig. 21 is a schematic view of a current trend of the antenna structure 200 operating in a dual-frequency WIFI mode. Obviously, when the current enters the second radiation emitter 30 from the fourth feeding source 31, the current flows through the first radiation section 303, the second radiation section 304 and the third radiation section 305 in sequence (see path P5), so as to excite the corresponding fifth mode to generate the radiation signal of the fifth frequency band. The fifth modality of this embodiment is a WIFI 2.4GHz modality. In addition, after the current enters the second radiator 30 from the fourth feeding source 31, the current sequentially flows through the first connection segment 306 and the second connection segment 307 (see path P6), so as to excite a corresponding sixth mode to generate a radiation signal of a sixth frequency band. The sixth modality of this embodiment is a WIFI 5GHz modality.

It can be understood that, when the antenna structure 200 operates in the low-frequency mode and the GPS mode, the S parameter (scattering parameter) graph and the radiation efficiency graph thereof are consistent with the S parameter (scattering parameter) graph and the radiation efficiency graph when the antenna structure 100 operates in the low-frequency mode and the GPS mode, which may be referred to in detail in fig. 10, 11, and 12, and are not repeated herein.

Fig. 22 is a graph of S-parameters (scattering parameters) of the antenna structure 200 in the middle-frequency mode and the high-frequency mode. Wherein the curve S201 is the S11 value when the inductance value of the switching element 153 of the first switching circuit 15 in the antenna structure 200 is 0.13 picofarad (pf). The curve S202 is the S11 value when the inductance value of the switching element 153 of the first switching circuit 15 in the antenna structure 200 is 0.15 pf. The curve S203 is the S11 value when the inductance value of the switching element 153 of the first switching circuit 15 in the antenna structure 200 is 0.2 pf. The curve S204 is the value of S11 when the first switching circuit 15 in the antenna structure 200 is open (i.e. not switched to any switching element 153). The curve S205 is the S11 value when the inductance value of the switching element of the second switching circuit 29 in the antenna structure 200 is 0.13 pf. The curve S206 is S11 when the inductance of the switching element of the second switching circuit 29 in the antenna structure 200 is 0.15 pf. The curve S207 is the S11 value when the inductance value of the switching element of the second switching circuit 29 in the antenna structure 200 is 0.2 pf. Curve S208 is the value of S11 when the second switching circuit 29 in the antenna structure 200 is open (i.e., not switched to any switching element).

Fig. 23 is a radiation efficiency graph of the antenna structure 200 operating in the middle-frequency mode and the high-frequency mode. Wherein a curve S211 is a radiation efficiency when an inductance value of the switching element 153 of the first switching circuit 15 in the antenna structure 200 is 0.13 picofarad (pf). The curve S212 is the radiation efficiency when the inductance value of the switching element 153 of the first switching circuit 15 in the antenna structure 200 is 0.15 pf. The curve S213 is the radiation efficiency when the inductance value of the switching element 153 of the first switching circuit 15 in the antenna structure 200 is 0.2 pf. The curve S214 is the radiation efficiency when the first switching circuit 15 in the antenna structure 200 is open (i.e. not switched to any switching element 153). The curve S215 shows the radiation efficiency when the inductance of the switching element of the second switching circuit 29 in the antenna structure 200 is 0.13 pf. The curve S216 is the radiation efficiency when the inductance value of the switching element of the second switching circuit 29 in the antenna structure 200 is 0.15 pf. The curve S217 is the radiation efficiency when the inductance value of the switching element of the second switching circuit 29 in the antenna structure 200 is 0.2 pf. Curve S218 is the radiation efficiency when the second switching circuit 29 in the antenna structure 200 is open (i.e. not switched to any switching element).

Fig. 24 is a S parameter (scattering parameter) graph when the antenna structure 200 operates in the WIFI 2.4GHZ frequency band and the WIFI 5GHZ frequency band. Fig. 25 is a radiation efficiency diagram of the antenna structure 200 operating in the WIFI 2.4GHZ frequency band. Fig. 26 is a radiation efficiency diagram of the antenna structure 200 operating in the WIFI 5GHz frequency band.

It is obvious from fig. 11 to fig. 13 and fig. 22 to fig. 26 that the antenna structure 200 can operate in the corresponding low frequency bands, such as the LTE Band 28 Band (703 + 803MHz), the LTE Band5 Band (869 + 894MHz), and the LTE Band8 Band (925 + 926 MHz). In addition, the antenna structure 100 can also work in the GPS frequency band (1.575GHz), the intermediate frequency band (1805 + 2170MHz), the high frequency band (2300 + 2400MHz and 2496 + 2690MHz) and the WIFI 2.4/5GHz dual frequency band, i.e. covering the low, medium, high, WIFI 2.4/5GHz dual frequency, the frequency range is wider, and when the antenna structure 200 works in the above frequency bands, the working frequency can satisfy the antenna working design requirement and has better radiation efficiency.

As described in the previous embodiments, the metal long arm a1 can excite the first mode to generate a radiation signal in a low frequency band, the metal short arm a2 can excite the third mode to generate a radiation signal in an intermediate frequency band and a high frequency band, and the first radiator 26 can excite the fourth mode to generate a radiation signal in a high frequency band. Therefore, the wireless communication apparatus 400 can simultaneously receive or transmit wireless signals in a plurality of different frequency bands using Carrier Aggregation (CA) technology of LTE-Advanced (LTE-Advanced) to increase transmission bandwidth. More specifically, the wireless communication device 400 may receive or transmit wireless signals simultaneously in a plurality of different frequency bands using the carrier aggregation technique and using the first radiator 26. The wireless communication device 400 may also receive or transmit wireless signals simultaneously in multiple different frequency bands using the carrier aggregation technique and using at least two of the metallic long arm a1, the metallic short arm a2, and the first radiator 26.

It is understood that in other embodiments, the positions of the first radiator 26 and the second switching circuit 29 and the second radiator 30 may be interchanged, and the position of the isolation portion 28 is not changed. Specifically, one end of the first radiator 26 is connected to the metal front frame 111, and the other end extends toward the second side portion 117. One end of the second switching circuit 29 is electrically connected to the first radiator 26, and the other end is connected to the metal back plate 112. The third feeding source 27 is disposed on the metal front frame 111 and electrically connected to the first radiator 26. The second radiator 30 is disposed in the accommodating space 114 surrounded by the metal piece 11, and is disposed adjacent to the short metal arm a 2. The end of the second radiator 30 where the third connection segment 308 is connected to the metal front frame 111 is replaced to be electrically connected to the isolation portion 28. One end of the fourth feeding source 31 is electrically connected to the connection point of the first radiation segment 303 and the first connection segment 306, and the other end is electrically connected to the isolation portion 28.

In addition, the antenna structure 100/200 is provided with the metal component 11, and the slot 118 and the break point 119 on the metal component 11 are both disposed on the metal front frame 111 and the metal side frame 113, and are not disposed on the metal back plate 112, so that the metal back plate 112 constitutes an all-metal structure, that is, there is no insulated slot, broken line or break point on the metal back plate 112, so that the metal back plate 112 can avoid the integrity and the aesthetics of the metal back plate 112 being affected by the arrangement of the slot, the broken line or the break point.

Examples 3 to 5

Referring to fig. 27, a third preferred embodiment of the present invention provides an antenna structure 500, which can be applied to a wireless communication device 600 such as a mobile phone, a personal digital assistant, etc. for transmitting and receiving radio waves to transmit and exchange wireless signals.

Referring to fig. 28 and fig. 29, the antenna structure 500 includes a housing 51, a first feeding source 53, a second feeding source 54, a first switching circuit 55, and a second switching circuit 57. The housing 51 may be a casing of the wireless communication device 600. In the present embodiment, the housing 51 is made of a metal material. The housing 51 includes a front frame 511, a back plate 512, and a bezel 513. The front frame 511, the back plate 512 and the frame 513 may be integrally formed. The front bezel 511, back panel 512, and bezel 513 constitute the housing of the wireless communication device 600. The front frame 511 is provided with an opening (not shown) for accommodating the display unit 601 of the wireless communication device 600. It is understood that the display unit 601 has a display plane exposed in the opening and disposed substantially parallel to the back plate 512.

The back plate 512 is disposed opposite to the front frame 511. The back plate 512 is directly connected to the frame 513, and there is no gap between the back plate 512 and the frame 513. The back plate 512 is an integrally formed single metal plate, and has

openings

606 and 607 for exposing the camera lens 604 and the flash 605. The backplate 512 does not have any slots, breaks, or breaks for dividing the insulation of the backplate 512 (see fig. 29). The backplate 512 can serve as a ground for the antenna structure 500 and the wireless communication device 600.

In another embodiment, a shielding cover (shielding mask) for shielding electromagnetic interference or a middle frame for supporting the display unit 601 may be disposed on a side of the display unit 601 facing the back plate 512. The shielding cover or the middle frame is made of metal materials. The shield or bezel may be coupled to the backplane 512 to serve as a ground for the antenna structure 500 and the wireless communication device 600.

The frame 513 is sandwiched between the front frame 511 and the back plate 512, and is respectively disposed around the peripheries of the front frame 511 and the back plate 512, so as to form an accommodating space 514 together with the display unit 601, the front frame 511 and the back plate 512. The accommodating space 514 is used for accommodating electronic components or circuit modules of the wireless communication device 600, such as a circuit board, a processing unit, and the like.

The frame 513 at least includes a terminal portion 515, a first side portion 516, and a second side portion 517. In this embodiment, the terminal portion 515 is a bottom end of the wireless communication device 600. The end portion 515 connects the front frame 511 and the rear plate 512. The first side portion 516 and the second side portion 517 are disposed opposite to each other, and are disposed at two ends of the end portion 515, preferably, vertically. The first side portion 516 and the second side portion 517 are also connected to the front frame 511 and the back plate 512.

The frame 513 is further provided with a port 518 and a slot 519, and the front frame 511 is provided with a breakpoint 520. The port 518 is opened at a central position of the end portion 515 and penetrates the end portion 515. The wireless communication device 600 also includes electronics 603. In this embodiment, the electronic component 603 is a USB module disposed in the accommodating space 514 and corresponding to the port 518, so that the electronic component 603 is partially exposed from the port 518. Thus, a user inserts a USB device through the port 518 to establish electrical connection with the electronic component 603.

In this embodiment, the slot 519 is disposed on the end portion 515, communicates with the port 518, and extends to the first side portion 516 and the second side portion 517 respectively. It is understood that in other embodiments, the slot 519 may be disposed on the end portion 515 and not extend to any of the first side portion 516 and the second side portion 517, or the slot 519 may be disposed on the end portion 515 and extend to only one of the first side portion 516 and the second side portion 517.

The break 520 is in communication with the slot 519 and extends to block the front frame 511. In the present embodiment, the breaking point 520 is disposed adjacent to the second side 517, such that the breaking point 520 divides the front frame 511 into two parts, i.e., a metal long arm T1 and a metal short arm T2. Wherein the front frame 511 at one side of the break point 520 until its portion extending to correspond to one of the end points E1 of the slot 519 together form the metal long arm T1. The front frame 511 at the other side of the break point 520 until its portion extending to correspond to the other end point E2 of the slot 519 forms the short metal arm T2. In this embodiment, the breaking point 520 is not located at the middle of the end portion 515, so the length of the metal long arm T1 is greater than the length of the metal short arm T2. In addition, the slots 519 and the breakpoints 520 are filled with insulating materials (for example, plastics, rubber, glass, wood, ceramics, etc., but not limited thereto), so as to separate the metal long arms T1, the metal short arms T2 and the back plate 512.

It is understood that, in this embodiment, the slot 519 is opened at one end of the side frame 513 close to the back plate 512 and extends to the front frame 511, so that the metal long arm T1 and the metal short arm T2 are completely formed by a part of the front frame 511. Of course, in other embodiments, the opening position of the slot 519 can be adjusted according to specific requirements. For example, the slot 519 is opened at one end of the side frame 513 close to the back plate 512 and extends towards the front frame 511, so that the metal long arm T1 and the metal short arm T2 are formed by a part of the front frame 511 and a part of the side frame 513.

It can be understood that there are no insulated slots, breaks or breakpoints in the lower half of the front frame 511 and the bottom half of the frame 513, except for the port 518, the slot 519 and the break point 520, so that there is only one break point 520 in the lower half of the front frame 511 and no other break points.

The first feeding source 53 can be electrically connected to one end of the metal long arm T1 near the first side 516 through a matching circuit 59 (see fig. 27 and fig. 31), so as to feed current into the metal long arm T1, so that the metal long arm T1 excites a first mode to generate a radiation signal in a first frequency band.

The second feeding source 54 can be electrically connected to one end of the short metal arm T2 near the break point 520 through a matching circuit (not shown), so as to feed current into the short metal arm T2, so that the short metal arm T2 excites a second mode to generate a radiation signal in a second frequency band.

Referring to fig. 30, the first switching circuit 55 is electrically connected to the middle of the metal long arm T1, and includes a first switching unit 551 and at least one first switching element 553. The first switching unit 551 is electrically connected to the metal long arm T1. The first switching element 553 may be an inductor, a capacitor, or a combination of an inductor and a capacitor. The first switching elements 553 are connected in parallel, and one end thereof is electrically connected to the first switching unit 551, and the other end thereof is electrically connected to the back plate 512, i.e., grounded.

Referring to fig. 27 and 31, one end of the matching circuit 59 is electrically connected to the metal long arm T1, and the other end of the matching circuit 59 is electrically connected to the first feeding source 53. One end of the second switching circuit 57 is electrically connected to the matching circuit 59, and the other end is electrically connected to the back plate 512, i.e. to ground. In the present embodiment, the second switching circuit 57 includes a second switching unit 571 and at least one second switching element 573. The second switching unit 571 is electrically connected to the matching circuit 59 to be electrically connected to the metal long arm T1 through the matching circuit 59. The second switching element 573 may be an inductor, a capacitor, or a combination of an inductor and a capacitor. The second switching elements 573 are connected in parallel, and one end thereof is electrically connected to the second switching unit 571, and the other end thereof is electrically connected to the back plate 512, i.e. grounded. In this way, by controlling the switching of the first and

second switching units

551 and 571, the metal long arm T1 can be switched to different first and/or

second switching elements

553 and 573. Since each of the first switching element 553 and the second switching element 573 has different impedance, the frequency band of the first mode of the metal long arm T1 can be adjusted by the switching of the first switching unit 551 and the second switching unit 571. The frequency band is adjusted to shift towards low frequency or high frequency.

Fig. 32 is a schematic diagram of the current flow of the antenna structure 500. When a current enters the metal long arm T1 from the first feeding source 53, the current flows through the metal long arm T1 and flows to the break point 520 (see path I1), so as to excite the first mode to generate a radiation signal of a first frequency band. When the current enters the short metal arm T2 from the second feeding source 54, the current flows through the front frame 511, the second side 517 and the back plate 512 (see path I2) in sequence, so as to excite the second mode to generate the radiation signal of the second frequency band. In this embodiment, the first mode is a low frequency mode, and the first frequency band is 704-960MHz frequency band. The second mode is a medium-high frequency mode, and the second frequency band is 1710-2690 MHz. Since the antenna structure 500 is provided with the first switching circuit 55 and the second switching circuit 57, the first switching circuit 55 and the second switching circuit 57 can be used in cooperation with each other to switch the low-frequency mode of the metal long arm T1 without affecting the operation of medium and high frequencies.

Referring to fig. 33, in an embodiment, the antenna structure 500 further includes one resonant circuit 58, where the number of the resonant circuits 58 is one, and the resonant circuit 58 includes an inductor L and a capacitor C connected in series. The resonant circuit 58 is electrically connected between the metal long arm T1 and the back plate 512, and is disposed in parallel with the first switching unit 551 and the at least one first switching element 553.

Referring to fig. 34, in another embodiment, the number of the resonant circuits 58 is the same as that of the first switching elements 553, i.e., is plural. Each resonant circuit 58 includes an inductor L1-Ln and a capacitor C1-Cn connected in series with each other. Each of the resonant circuits 58 is electrically connected between the first switching unit 551 and the back plate 512, and is disposed in parallel with the corresponding first switching element 553. It is understood that in fig. 30, 31, 33 and 34, the shielding cover or the middle frame may replace the back plate 512 for grounding the first switching circuit 55 and/or the second switching circuit 57.

Fig. 35 is a schematic diagram showing the relationship between the S-parameter (scattering parameter) and the frequency when one resonant circuit 58 is connected in parallel to the first switching circuit 55 shown in fig. 33. It is assumed that the antenna structure 500 operates in the first mode (see curve S351) when the resonant circuit 58 shown in fig. 33 is not added to the antenna structure 500. When the resonant circuit 58 is added to the antenna structure 500, the resonant circuit 58 can make the metal long arm T1 resonate an additional narrow-band mode (i.e., a third mode, please refer to the curve S352) to generate a radiation signal of a third frequency band, which can effectively increase the application frequency band of the antenna structure 500, thereby achieving multi-frequency or broadband application.

Fig. 36 is a schematic diagram showing the relationship between the S-parameter (scattering parameter) and the frequency when one resonant circuit 58 is connected in parallel to the side of each first switching element 553 in the first switching circuit 55 shown in fig. 34. It is assumed that the antenna structure 500 can operate in the first mode (see curve S361) when the resonant circuit 58 shown in fig. 34 is not added to the antenna structure 500. Thus, when the resonant circuit 58 is added to the antenna structure 500, the resonant circuit 58 can make the metal long arm T1 resonate out the narrow-band mode (please refer to curve S362), so as to effectively increase the application frequency band of the antenna structure 500, thereby achieving multi-band or wideband applications. In addition, the inductance value of the inductor L1-Ln and the capacitance value of the capacitor C1-Cn in the resonant circuit 58 are set to determine the frequency band of the narrow-band mode during the switching of the first mode. For example, in one embodiment, as shown in fig. 36, by setting the inductance and capacitance values in the resonant circuit 58, when the first switching unit 551 switches to a different first switching element 553, the narrow-band mode of the antenna structure 500 is switched accordingly, for example, the range of movement can be moved from f1 to fn.

It is understood that, in another embodiment, the frequency band of the narrow-band mode can also be fixed by setting the inductance and capacitance values in the resonant circuit 58, so that the frequency band of the narrow-band mode is fixed no matter which first switching element 553 the first switching unit 551 switches to.

Of course, it is understood that in other embodiments, the resonant circuit 58 is not limited to include the inductor L and the capacitor C, but may be composed of other resonant elements.

Fig. 37 is a schematic diagram of a current flow of the antenna structure 500 provided with the resonant circuit 58 and operating in a low-frequency mode. Obviously, when the current enters the metal long arm T1 from the first feeding source 53, the current flows through the metal long arm T1 and flows to the break point 520 (refer to path I3), so as to excite the first mode to generate the radiation signal of the first frequency band. In addition, since the antenna structure 500 is provided with the first switching circuit 55 and the second switching circuit 57, the low-frequency mode of the metal long arm T1 can be switched by the cooperation of the first switching circuit 55 and the second switching circuit 57, and the medium-frequency and high-frequency operations are not affected. In this embodiment, the first mode is a low frequency mode, and the first frequency band is 704-960MHz frequency band.

Fig. 38 is a schematic diagram of the current flowing when the antenna structure 500 is provided with the resonant circuit 58 and operates in the middle-high frequency band. Obviously, when the current enters the short metal arm T2 from the second feeding source 54, the current flows through the front frame 511, the second side 517 and the back plate 512 (see path I4) in sequence, so as to excite the second mode to generate the radiation signal of the second frequency band. Meanwhile, when the current enters the short metal arm T2 from the second feeding source 54, the current will be coupled to the long metal arm T1 through the break 520, and flow to the resonant circuit 58 in the first switching circuit 55, and finally flow to the back plate 512 (see path I5). Thus, the coupling effect of the break point 520, in cooperation with the resonant circuit 58, excites the third mode to generate a radiation signal of a third frequency band. In this embodiment, the second mode is an intermediate frequency mode, and the second frequency band is 1710-2400 MHz. The third mode is a high frequency mode, and the third frequency band is 2400-.

Fig. 39 is a graph of the S-parameter (scattering parameter) of the antenna structure 500 operating in the low frequency mode. The curve S391 is the S11 value when the antenna structure 500 operates in the 704-746MHz band. The curve S392 is the S11 value for the antenna structure 500 operating at 746-787 MHz. The curve S393 is the S11 value when the antenna structure 500 operates in the 824-894MHz frequency band. The curve S394 is the S11 value when the antenna structure 500 operates in the 880-960MHz frequency band. Obviously, the curves S391 to S394 correspond to four different frequency bands, and correspond to four of the low frequency modes switchable by the first switching circuit 55 and the second switching circuit 57, respectively.

Fig. 40 is a radiation efficiency graph of the antenna structure 500 operating in a low frequency mode. The curve S401 is the radiation efficiency of the antenna structure 500 operating in the frequency range of 704-746 MHz. Curve S402 shows the radiation efficiency of the antenna structure 500 operating at 746-787 MHz. The curve S403 shows the radiation efficiency of the antenna structure 500 operating in the 824-894MHz frequency band. The curve S404 shows the radiation efficiency of the antenna structure 500 operating in 880-960MHz band. Obviously, the curves S401 to S404 correspond to four different frequency bands, and correspond to four of the low frequency modes switchable by the first switching circuit 55 and the second switching circuit 57.

Fig. 41 is a graph of S-parameters (scattering parameters) when the antenna structure 500 operates in the middle and high frequency bands (i.e., 1710-. Fig. 42 is a graph of the radiation efficiency of the antenna structure 500 operating in the middle and high frequency bands (i.e., 1710-.

It is obvious from fig. 39 to fig. 42 that the antenna structure 500 can operate in the corresponding low frequency bands, such as 704 + 746MHz band, 746 + 787MHz band, 824 + 894MHz band, and 880 + 960MHz band. In addition, the antenna structure 500 can also work in the middle and high frequency bands (1710-.

Referring to fig. 43, an antenna structure 500a according to a fourth preferred embodiment of the invention is shown. The antenna structure 500a includes a housing 51, a first feeding source 53, a second feeding source 54, a first switching circuit 55 and a second switching circuit 57. The housing 51 includes a front frame 511, a back plate 512, and a bezel 513. The frame 513 at least includes a terminal portion 515, a first side portion 516, and a second side portion 517. A slot 519 is further formed in the side frame 513, and a break point 520 is further formed in the front frame 511. The break point 520 divides the front frame 511 into two parts including a metal long arm T1 and a metal short arm T2.

It is understood that the antenna structure 500a is different from the antenna structure 500 in that the antenna structure 500a further includes a first radiator 61, a third feeding source 62, an isolation portion 63, a second radiator 64, and a fourth feeding source 65.

It can be understood that the first radiator 61 is disposed in the accommodating space 514 surrounded by the housing 51, is disposed adjacent to the short metal arm T2, and is spaced from the back plate 512. The first radiator 61 includes a first radiation portion 610, a second radiation portion 611, and a third radiation portion 612. The first radiating portion 610 is substantially L-shaped, and includes a first radiating arm 613 and a second radiating arm 614. The first radiation arm 613 is substantially in a straight strip shape, and one end thereof is electrically connected to the isolation portion 63 and extends in a direction parallel to the end portion 515 and the back plate 512 and close to the first side portion 516. The second radiating arm 614 is substantially in the shape of a straight bar, and is disposed non-coplanar with the first radiating arm 613. Specifically, the second radiation arm 614 is vertically connected to the end of the first radiation arm 613 near the first side 516, and extends in a direction perpendicular to and away from the back plate 512.

The second radiation portion 611 is substantially U-shaped, and includes a first radiation section 615, a second radiation section 616, and a third radiation section 617, which are electrically connected in sequence. The first radiating segment 615, the second radiating segment 616 and the third radiating segment 617 are disposed in a common plane and are disposed in a plane parallel to a plane in which the first radiating arm 613 is disposed. The first radiating section 615 is substantially straight and is disposed parallel to the end portion 515. One end of the first radiating section 615 is perpendicularly connected to the end of the second radiating arm 614 far from the first radiating arm 613, and extends in a direction close to the first side 516. The second radiating section 616 is a straight strip, one end of the second radiating section is vertically connected to the end of the first radiating section 615 far from the second radiating arm 614, and the other end of the second radiating section extends in a direction parallel to the second side 517 and far from the end portion 515, so as to form an L-shaped structure with the first radiating section 615. The third radiation section 617 is substantially in a rectangular bar shape, one end of the third radiation section 617 is connected to one end of the second radiation section 616, which is far away from the first radiation section 615, and the other end of the third radiation section 617 extends in a direction parallel to the first radiation section 615 and close to the second side 517, that is, the third radiation section 617 and the first radiation section 615 are respectively disposed on the same side of the second radiation section 616 and are respectively disposed at two ends of the second radiation section 616.

The third radiation portion 612 is substantially L-shaped, and includes a first connection segment 618 and a second connection segment 619. The first connecting segment 618 is substantially rectangular and has one end electrically connected to the junction of the second radiating arm 614 and the first radiating segment 615, and the other end extending in a direction parallel to the second radiating segment 616 and close to the third radiating segment 617 until passing over the third radiating segment 617. The second connecting segment 619 is substantially straight, and has one end perpendicularly connected to the end of the first connecting segment 618 far from the first radiating segment 615, and the other end extending in a direction parallel to the first radiating segment 615 and close to the second radiating segment 616 until being substantially flush with the end of the third radiating segment 617.

One end of the third feeding source 62 is electrically connected to the first radiator 61, for example, the first connection segment 618 of the first radiator 61, through a matching circuit (not shown), and the other end is electrically connected to the isolation portion 63, so as to feed current to the second radiation portion 611 and the third radiation portion 612, respectively, and further excite corresponding working modes, for example, a WIFI 2.4GHz mode and a WIFI 5GHz mode.

It can be understood that in the present embodiment, since the frequency bands of the respective resonances of the second feed source 54 and the third feed source 62 are relatively close, the antenna isolation is easily disturbed. Therefore, the isolation portion 63 is used to extend the structural current paths of the two feeding sources, i.e., the second feeding source 54 and the third feeding source 62, so as to improve the isolation between the metal short arm T2 and the first radiator 61.

It is understood that the isolation portion 63 may be any shape and size, or a planar metal sheet, or a metal shell, etc., and it is only necessary to ensure that the isolation portion 63 can extend the structural current paths of the second feeding source 54 and the third feeding source 62, so as to increase the isolation between the metal short arm T2 and the first radiator 61. For example, in the present embodiment, the isolation portion 63 is in a block shape, and is disposed on the back plate 512 and formed by extending the second side portion 517 toward the first side portion 516. In other embodiments, the isolation portion 63 may be disposed on the middle frame.

The second radiator 64 is disposed in the accommodating space 514 surrounded by the housing 51, is adjacent to the metal long arm T1, and is spaced from the back plate 512. In this embodiment, the second radiator 64 is substantially a straight strip and is disposed parallel to the end portion 515. One end of the second radiator 64 is connected to the front frame 511 near the first feeding source 53, and the other end extends toward the second side 517. The fourth feeding source 65 is disposed on the front frame 511, and is electrically connected to the second radiator 64, for feeding current to the second radiator 64.

It can be understood that when the antenna structure 500a operates in the low frequency mode, the current direction of the antenna structure 500a is consistent with the current direction of the antenna structure 500 operating in the low frequency mode, which may be referred to fig. 37 specifically, and is not described herein again.

It can be understood that fig. 44 is a schematic diagram of the current trend when the antenna structure 500a operates in the 1710-2400MHz frequency band. Obviously, when the current enters the short metal arm T2 from the second feeding source 54, the current flows through the front frame 511, the second side 517 and the back plate 512 (see path I6) in sequence, so as to excite the second mode to generate the radiation signal of the second frequency band. Meanwhile, when the current enters the short metal arm T2 from the second feeding source 54, the current will be coupled to the long metal arm T1 through the break 520, and flow to the resonant circuit 58 in the first switching circuit 55, and finally flow to the back plate 512 (see path I7). Thus, the coupling effect of the break point 520, in cooperation with the resonant circuit 58, excites the third mode to generate a radiation signal of a third frequency band. In this embodiment, the second mode is an intermediate frequency mode, and the second frequency band is 1710-2170 MHz. The third mode is a high frequency mode, and the third frequency Band is 2300-plus 2400MHz frequency Band (i.e. LTE-A Band 40 frequency Band).

Fig. 45 is a schematic view of a current trend of the antenna structure 500a operating in a dual-frequency WIFI mode. Obviously, when the current enters the first radiator 61 from the third feeding source 62, the current flows through the first radiation section 615, the second radiation section 616 and the third radiation section 617 in sequence (see path I8), so as to excite a corresponding fourth mode to generate a radiation signal of a fourth frequency band. In this embodiment, the fourth mode is a WIFI 2.4GHz mode. In addition, after the current enters the first radiator 61 from the third feeding source 62, the current sequentially flows through the first connection segment 618 and the second connection segment 619 (see path I9), so as to excite a corresponding fifth mode to generate a radiation signal of a fifth frequency band. In this embodiment, the fifth modality is a WIFI 5GHz modality.

Please refer to fig. 46, which is a schematic diagram illustrating a current trend of the antenna structure 500a operating in the frequency ranges of 2496-. Obviously, after the current enters the second radiator 64 from the fourth feeding source 65, the current flows to the end of the second radiator 64 far from the fourth feeding source 65 (see path I10), so as to excite a sixth mode to generate a radiation signal in a sixth frequency band. In this embodiment, the sixth mode is a high-frequency mode.

It can be understood that, when the antenna structure 500a operates in the low frequency mode, the S parameter (scattering parameter) graph and the radiation efficiency map thereof are consistent with the S parameter (scattering parameter) graph and the radiation efficiency map when the antenna structure 500 operates in the low frequency mode, which may be referred to as fig. 39 and fig. 40, and are not repeated herein.

Fig. 47 is a graph of S-parameters (scattering parameters) when the antenna structure 500a operates in 1710-2170MHz Band and 2300-2400MHz Band (i.e., LTE-a if and Band 40 Band). Fig. 48 is a radiation efficiency diagram of the antenna structure 500a operating in 1710-2170MHz Band and 2300-2400 Band (i.e., LTE-a if and Band 40 Band).

Fig. 49 is a S parameter (scattering parameter) graph when the antenna structure 500a operates in the WIFI 2.4GHZ frequency band and the WIFI 5GHZ frequency band. Fig. 50 is a radiation efficiency diagram of the antenna structure 500a operating in the WIFI 2.4GHZ frequency band and the WIFI 5GHZ frequency band.

Fig. 51 is a graph of the S-parameter (scattering parameter) when the antenna structure 500a operates in the LTE-a Band41 mode (2496-. Fig. 52 is a radiation efficiency graph of the antenna structure 500a operating in the LTE-a Band41 mode (2496-.

It is obvious from fig. 39 to 40 and fig. 47 to 52 that the antenna structure 500a can operate in the corresponding low frequency bands, such as 704-. In addition, the antenna structure 500a can also work in the middle frequency band (1710-.

Fig. 53 is a schematic diagram of an antenna structure 500b according to a fifth preferred embodiment of the invention. The antenna structure 500b includes a housing 51, a first feeding source 53, a second feeding source 54, a first switching circuit 55, a second switching circuit 57, a first radiator 61, a third feeding source 62, an isolation portion 63, a second radiator 64, a fourth feeding source 65, and a third switching circuit 66. The housing 51 includes a front frame 511, a back plate 512, and a bezel 513. The frame 513 at least includes a terminal portion 515, a first side portion 516, and a second side portion 517. A slot 519 is further formed in the side frame 513, and a break point 520 is further formed in the front frame 511. The break point 520 divides the front frame 511 into two parts including a metal long arm T1 and a metal short arm T2.

It is understood that the antenna structure 500b differs from the antenna structure 500a in that the antenna structure 500b further includes a third switching circuit 66. One end of the third switching circuit 66 is electrically connected to the second radiator 64, and the other end is electrically connected to the back plate 512, i.e. grounded. The third switching circuit 66 is used to adjust the frequency band of the high-frequency mode of the second radiator 64, and the specific circuit structure and the working principle thereof can refer to the description of the first switching circuit 55 in fig. 30, which is not described herein again.

It can be understood that when the antenna structure 500b operates in the low frequency mode, the current direction of the antenna structure 500b is the same as the current direction of the antenna structure 500 operating in the low frequency mode, and reference may be specifically made to fig. 37, which is not described herein again

It is understood that fig. 54 is a schematic diagram of the current trend of the antenna structure 500b operating in the 1710-2170MHz frequency band. Obviously, when the current enters the short metal arm T2 from the second feeding source 54, the current flows through the front frame 511, the second side 517 and the back plate 512 (see path I11) in sequence, so as to excite the second mode to generate the radiation signal of the second frequency band. Meanwhile, when the current enters the short metal arm T2 from the second feeding source 54, the current will be coupled to the long metal arm T1 through the break 520, and flow to the resonant circuit 58 in the first switching circuit 55, and finally flow to the back plate 512 (see path I12). Thus, the coupling effect of the break point 520, in cooperation with the resonant circuit 58, excites the third mode to generate a radiation signal of a third frequency band. In this embodiment, the second mode is an intermediate frequency mode, and the second frequency band is 1710-1990 MHz. The third mode is an intermediate frequency mode, and the third frequency band is 2110-2170MHz frequency band.

It can be understood that, when the antenna structure 500b operates in the dual-frequency WIFI mode, the current direction of the antenna structure is consistent with the current direction of the antenna structure 500a operating in the dual-frequency WIFI mode, which may be referred to fig. 45 specifically, and is not described herein again.

Please refer to fig. 55, which is a schematic diagram of the current trend when the antenna structure 500b operates in the frequency ranges of 2300-. Obviously, after the current enters the second radiator 64 from the fourth feeding source 65, the current flows to the end of the second radiator 64 far from the fourth feeding source 65 (see path I13), so as to excite a sixth mode to generate a radiation signal in a sixth frequency band. In this embodiment, the sixth mode is a high-frequency mode. In addition, since the antenna structure 500b is provided with the grounded third switching circuit 66, the high-frequency mode can be switched by using the third switching circuit 66, for example, the antenna structure 500b can be switched to the 2300-Band 2400MHz frequency Band and/or the LTE-a Band41 frequency Band (2496-Band 2690MHz), and the high-frequency mode can coexist with the intermediate-frequency mode and the LTE-a Band 40 mode.

It can be understood that, when the antenna structure 500b operates in the low frequency mode, the S parameter (scattering parameter) graph and the radiation efficiency map thereof are consistent with the S parameter (scattering parameter) graph and the radiation efficiency map when the antenna structure 500 operates in the low frequency mode, which can be referred to fig. 39 and fig. 40 specifically, and are not repeated herein.

Fig. 56 is a graph of S-parameters (scattering parameters) for the antenna structure 500b operating in the 1710-2170MHz frequency band. Fig. 57 is a graph of the radiation efficiency of the antenna structure 500b operating in the 1710-2170MHz frequency band.

It can be understood that, when the antenna structure 500b works in the WIFI 2.4GHZ frequency band and the WIFI 5GHZ frequency band, both the S parameter (scattering parameter) graph and the radiation efficiency map thereof are consistent with the S parameter (scattering parameter) graph and the radiation efficiency map when the antenna structure 500a works in the WIFI 2.4GHZ frequency band and the WIFI 5GHZ frequency band, which may be referred to fig. 49 and fig. 50 specifically, and are not described herein again.

Fig. 58 is a graph of S-parameters (scattering parameters) when the antenna structure 500b operates in the 2300-. Fig. 59 is a radiation efficiency graph of the antenna structure 500b operating in the 2300-.

As described in the previous embodiments, the metal long arm T1 can excite the first mode to generate a radiation signal in a low frequency band, the metal short arm T2 can excite the second mode and the third mode to generate a radiation signal in a middle frequency band and a high frequency band, and the second radiator 64 can excite the sixth mode to generate a radiation signal in a high frequency band. Therefore, the wireless communication apparatus 600 can simultaneously receive or transmit wireless signals in a plurality of different frequency bands using Carrier Aggregation (CA) technology of LTE-Advanced (LTE-Advanced) to increase transmission bandwidth. More specifically, the wireless communication device 600 may receive or transmit wireless signals in a plurality of different frequency bands simultaneously using the carrier aggregation technology and using at least two of the metallic long arm T1, the metallic short arm T2, and the second radiator 64.

It is understood that in other embodiments, the positions of the first radiator 61, the second radiator 64 and the third switching circuit 66 may be interchanged, and the position of the isolation portion 63 is not changed. Specifically, the first radiator 61 is disposed in the accommodating space 514 surrounded by the housing 51, has a shape which is symmetrical to the left and right sides (left and right turned over) shown in fig. 17, and is disposed adjacent to the metal long arm T1. The end of the first radiating arm 613 of the first radiator 61 electrically connected to the spacer 63 is replaced with the end electrically connected to the front frame 511. The third feeding source 62 is disposed on the metal front frame 511 and electrically connected to the first connecting segment 618 of the first radiator 61.

One end of the second radiator 64 is connected to the isolation portion 63, and the other end extends toward the first side portion 516. One end of the fourth feeding source 65 is electrically connected to the second radiator 64 through a matching circuit (not shown), and the other end is electrically connected to the isolation portion 63 for feeding current to the second radiator 64. One end of the third switching circuit 66 is electrically connected to the second radiator 64, and the other end is connected to the backplane 512.

In addition, the slot 519 and the break point 520 on the housing 51 are both disposed on the front frame 511 and the side frame 513 and are not disposed on the back plate 512, so that the back plate 512 forms an all-metal structure, that is, there is no insulated slot, break line or break point on the back plate 512, so that the back plate 512 can avoid the integrity and the aesthetic property of the back plate 512 being affected by the arrangement of the slot, break line or break point.

Examples 6 to 7

Referring to fig. 60, a sixth preferred embodiment of the invention provides an antenna structure 700, which can be applied to a wireless communication device 800 such as a mobile phone, a personal digital assistant, etc., for transmitting and receiving radio waves to transmit and exchange wireless signals.

Referring to fig. 61 and 62, the antenna structure 700 includes a housing 71, a first feeding source S1, a first radiator 73, a first switching circuit 75, a second switching circuit 76, a second radiator 78, a second feeding source S2, and a third switching circuit 79. The housing 71 may be an outer shell of the wireless communication device 800. In the present embodiment, the housing 71 is made of a metal material. The housing 71 includes a front frame 711, a back plate 712, and a bezel 713. The front frame 711, the back plate 712 and the rim 713 may be integrally formed. The front bezel 711, the back plate 712, and the bezel 713 form a housing of the wireless communication device 800. The front frame 711 is provided with an opening (not shown) for accommodating the display unit 801 of the wireless communication device 800. It is understood that the display unit 801 has a display plane exposed in the opening and disposed substantially parallel to the back plate 712.

The back plate 712 is disposed opposite to the front frame 711. The back plate 712 is directly connected to the frame 713, and there is no gap between the back plate 712 and the frame 713. The back plate 712 is a single metal plate formed integrally, the back plate 712 is provided with

openings

806 and 807 for exposing the camera lens 804 and the flash lamp 805, and the back plate 712 is not provided with any insulating slots, disconnections or breakpoints for dividing the back plate 712 (see fig. 62). The backplate 712 can serve as a ground for the antenna structure 700 and the wireless communication device 800.

In another embodiment, a shielding cover (shielding mask) for shielding electromagnetic interference or a middle frame for supporting the display unit 801 may be disposed on a side of the display unit 801 facing the back plate 712. The shielding cover or the middle frame is made of metal materials. The shield or bezel may be coupled to the backplane 712 to serve as a ground for the antenna structure 700 and the wireless communication device 800.

The frame 713 is sandwiched between the front frame 711 and the rear plate 712, and is disposed around the peripheries of the front frame 711 and the rear plate 712, respectively, so as to form an accommodating space 714 together with the display unit 801, the front frame 711 and the rear plate 712. The accommodating space 714 is used for accommodating electronic components or circuit modules such as a circuit board, a processing unit, etc. of the wireless communication device 800 therein.

The frame 713 includes at least a tip portion 715, a first side portion 716, and a second side portion 717. In this embodiment, the terminal 715 is a bottom end of the wireless communication device 800. The end portion 715 connects the front frame 711 and the rear plate 712. The first side portion 716 is disposed opposite to the second side portion 717, and both of the first side portion 716 and the second side portion 717 are disposed at both ends of the end portion 715, preferably, vertically. The first side portion 716 and the second side portion 717 also connect the front frame 711 and the back plate 712.

The frame 713 is further provided with a port 718 and a slot 719, and the front frame 711 is provided with a break point 720. The port 718 is opened at a middle position of the terminal portion 715 and penetrates the terminal portion 715. The wireless communication device 800 also includes electronic components 803. In this embodiment, the electronic component 803 is a USB module, which is disposed in the accommodating space 714 and corresponds to the port 718, so that the electronic component 803 is partially exposed from the port 718. Thus, a user can insert a USB device through the port 718 to establish electrical connection with the electronic component 803.

In this embodiment, the slot 719 is disposed on the end portion 715, communicates with the port 718, and extends to the first side portion 716 and the second side portion 717 respectively. It is understood that in other embodiments, the slot 719 may be provided only on the end portion 715 and not extend to any one of the first side portion 716 and the second side portion 717, or the slot 719 may be provided on the end portion 715 and only extend to one of the first side portion 716 and the second side portion 717.

The breaking point 720 is communicated with the slot 719 and extends to block the front frame 711. In the present embodiment, the break point 720 is disposed adjacent to the second side portion 717, so that the break point 720 divides the front frame 711 into two parts, namely, a metal long arm F1 and a metal short arm F2. The front frame 711 at one side of the break point 720 and the part thereof extending to the position corresponding to one of the end points D1 of the slot 719 form the metal long arm F1. The front frame 711 at the other side of the break point 720 forms the short metal arm F2 until the part thereof extending to the position corresponding to the other end point D2 of the slot 719. In this embodiment, the breaking point 720 is not located at the middle of the terminal 715, so the length of the long metal arm F1 is greater than the length of the short metal arm F2. In addition, the slots 719 and the breaks 720 are filled with insulating materials (for example, plastics, rubbers, glass, wood, ceramics, etc., but not limited thereto), so as to separate the long metal arm F1, the short metal arm F2 and the back plate 712.

It is understood that, in this embodiment, the slot 719 is opened at one end of the rim 713 near the back plate 712 and extends to the front frame 711, so that the metal long arm F1 and the metal short arm F2 are completely formed by a part of the front frame 711. Of course, in other embodiments, the opening position of the slot 719 can be adjusted according to specific requirements. For example, the slot 719 is opened at one end of the rim 713 near the back plate 712, and extends toward the front frame 711, so that the metal long arm F1 and the metal short arm F2 are formed by a portion of the front frame 711 and a portion of the rim 713.

It can be understood that there are no insulating slots, breaks or breakpoints on the lower half of the front frame 711 and the frame 713 except for the ports 718, the slots 719 and the breakpoints 720, so there is only one breakpoint 720 and no other breakpoints on the lower half of the front frame 711.

In the present embodiment, the first feeding source S1 is disposed in the accommodating space 714 and located between the electronic element 803 and the second side portion 717. The first feeding source S1 is electrically connected to the first radiator 73, and is used for feeding current to the first radiator 73.

The first radiator 73 is disposed in the accommodating space 714 and located between the electronic component 803 and the second side portion 717. The first radiator 73 includes a first radiation portion 731 and a second radiation portion 733. One end of the first radiation part 731 is electrically connected to the first feeding source S1 through a matching circuit 81, and the other end is coupled to the metal long arm F1 at a distance. Thus, when a current is fed from the first feeding source S1, the current flows through the matching circuit 81 and the first radiation part 731, and is coupled to the metal long arm F1. The first radiation portion 731 and the metal long arm F1 form a coupling structure, so as to couple with each other and resonate and excite a first mode to generate a radiation signal of a first frequency band. In this embodiment, the first mode is an LTE-a low-frequency mode, and the first frequency band is a 704-960MHz frequency band.

In the present embodiment, the first radiation portion 731 includes a first radiation segment 734, a second radiation segment 735, and a third radiation segment 736. The first radiation segment 734, the second radiation segment 735, and the third radiation segment 736 are disposed coplanar. The first radiating section 734 is substantially in the shape of a rectangular bar, and has one end electrically connected to the first feed source S1 through the matching circuit, and the other end extending in a direction parallel to the end portion 715 and close to the electronic element 803, until the break point 720 is crossed. The second radiating section 735 is substantially rectangular and has one end vertically connected to the end of the first radiating section 734 away from the first feed source S1, and the other end extending in a direction parallel to the second side portion 717 and close to the metal long arm F1, so as to form an L-shaped structure with the first radiating section 734. The third radiation section 736 is substantially rectangular in shape. The third radiating section 736 is spaced from and parallel to the metal long arm F1. The third radiating section 736 is vertically connected to an end of the second radiating section 735 far from the first radiating section 734, and extends in a direction close to the first side portion 716 and the second side portion 717, so as to form a substantially T-shaped structure with the second radiating section 735.

In this embodiment, the second radiation portion 733 is a capacitor. One end of the second radiation part 733 is electrically connected to the connection point of the matching circuit of the first feed source S1 and the first radiation segment 734, and the other end is electrically connected to the short metal arm F2. Thus, when a current is fed from the first feeding source S1, the current flows through the second radiation portion 733 and further flows into the short metal arm F2, so that the short metal arm F2 excites a second mode to generate a radiation signal of a second frequency band. In this embodiment, the second mode is an LTE-a intermediate frequency mode, and the second frequency band is a 1710-. In addition, the current flowing through the second radiation part 733 and the short metal arm F2 will be coupled to the long metal arm F1 through the break point 720, so as to excite a third mode to generate a radiation signal of a third frequency band. In this embodiment, the third mode is another LTE-a intermediate frequency mode, and the third frequency band is 2110-2170MHz frequency band. Thus, the second mode and the third mode will form a broadband resonance application, i.e. 1710-2170 band.

Referring to fig. 63, the first switching circuit 75 is electrically connected to the middle portion of the metal long arm F1, and includes a first switching unit 751 and at least a first switching element 753. The first switching unit 751 is electrically connected to the metal long arm F1. The first switching element 753 may be inductive, capacitive, or a combination of inductive and capacitive. The first switching elements 753 are connected in parallel, and one end thereof is electrically connected to the first switching unit 751, and the other end thereof is electrically connected to the back plate 712, i.e., grounded.

Referring to fig. 64, one end of the matching circuit 81 is electrically connected to the first feeding source S1, and the other end of the matching circuit 81 is electrically connected to the first radiation part 731. One end of the second switching circuit 76 is electrically connected to the matching circuit 81, and the other end is electrically connected to the back plate 712, i.e. to ground. In the present embodiment, the second switching circuit 76 includes a second switching unit 761 and at least one second switching element 763. The second switching unit 761 is electrically connected to the matching circuit 81 to be electrically connected to the first radiation part 81 through the matching circuit 81. The second switching element 763 may be an inductor, a capacitor, or a combination of an inductor and a capacitor. The second switching elements 763 are connected in parallel, and one end thereof is electrically connected to the second switching unit 761, and the other end thereof is electrically connected to the back plate 712, i.e., grounded. As such, by controlling the switching of the first and

second switching units

751 and 761, the metal long arm F1 can be switched to different first and/or

second switching elements

753 and 763. Since each of the first and

second switching elements

753 and 763 has different impedance, the frequency band of the first mode of the metal long arm F1 can be adjusted by switching the first and

second switching units

751 and 761. The frequency band is adjusted to shift towards low frequency or high frequency. It is understood that the first switching circuit 75 and the second switching circuit 76 can be switched individually or together.

It is understood that, referring to fig. 65, in one embodiment, the first switching circuit 75 further includes a resonant circuit 77, the number of the resonant circuits 77 is one, and the resonant circuit 77 includes an inductor L and a capacitor C connected in series. The resonant circuit 77 is electrically connected between the metal long arm F1 and the back plate 712, and is disposed in parallel with the first switching unit 751 and the at least one first switching element 753. Referring to fig. 66, in another embodiment, the number of the resonant circuits 77 is the same as that of the first switching elements 753, that is, a plurality of resonant circuits are provided. Each resonant circuit 77 includes an inductor L1-Ln and a capacitor C1-Cn connected in series with each other. Each of the resonant circuits 77 is electrically connected to the first switching unit 751 and the back plate 712, respectively, and is disposed in parallel with the corresponding first switching element 753.

In fig. 63, 64, 65 and 66, the shielding case or the middle frame may replace the back plate 712 to ground the first switching circuit 75 and/or the second switching circuit 76.

Fig. 67 is a schematic diagram showing the relationship between the S-parameter (scattering parameter) and the frequency when the first switching unit 751 and the first switching element 753 of the first switching circuit 75 shown in fig. 65 are connected in parallel to one resonant circuit 77. It is assumed that the antenna structure 700 operates in the first mode (see curve S671) when the resonant circuit 77 shown in fig. 65 is not added to the antenna structure 700. When the resonant circuit 77 is added to the antenna structure 700, the resonant circuit 77 can make the metal long arm F1 cooperate with the break point 720 to resonate out a narrow frequency mode (the third mode, i.e. 2110-2170MHz band, please refer to the curve S672) to generate a radiation signal in the third frequency band, which can effectively increase the application frequency band of the antenna structure 700, thereby achieving multi-frequency or wideband application.

Fig. 68 is a schematic diagram showing the relationship between the S-parameter (scattering parameter) and the frequency when one resonant circuit 77 is connected in parallel to one side of each first switching element 753 in the first switching circuit 75 shown in fig. 66. It is assumed that the antenna structure 700 can operate in the first mode (see curve S681) when the resonant circuit 77 shown in fig. 66 is not added to the antenna structure 700. Thus, when the resonant circuit 77 is added to the antenna structure 700, the resonant circuit 77 can make the metal long arm F1 cooperate with the break point 720 to resonate out the narrow-band mode (please refer to the curve S682), i.e. 2110-2170MHz band, which can effectively increase the application band of the antenna structure 700, thereby achieving multi-band or wideband application.

In addition, the inductance of the inductor L1-Ln in the resonant circuit 77 and the capacitance of the capacitor C1-Cn are set to determine the frequency band of the narrow-band mode during the switching of the first mode. For example, in one embodiment, for example as shown in fig. 68, by setting the inductance and capacitance values in the resonant circuit 77, when the first switching unit 751 is switched to the different first switching element 753, the narrow-band mode of the antenna structure 700 is also switched, for example, the narrow-band mode can be moved from f1 to fn, and the moving range is very wide.

It is understood that, in another embodiment, the frequency band of the narrow-band mode can also be fixed by setting the inductance and capacitance values in the resonant circuit 77, so that the frequency band of the narrow-band mode is fixed no matter which first switching element 753 the first switching unit 751 switches to.

Of course, it is understood that in other embodiments, the resonant circuit 77 is not limited to include the inductor L and the capacitor C, and may be composed of other resonant elements.

In this embodiment, the second radiator 78 is disposed in the accommodating space 714 surrounded by the housing 71, is disposed adjacent to the metal long arm F1, and is spaced apart from the back plate 712. In this embodiment, the second radiator 78 is substantially a straight strip and is disposed parallel to the terminal portion 715. One end of the second radiator 78 is connected to the front frame 711 near the end D1, and the other end extends toward the second side 717. The second feeding source S2 is disposed on the front frame 711, and is electrically connected to the second radiator 78 for feeding current to the second radiator 78. Thus, when the current enters from the second feeding source S2, the current flows through the second radiator 78, so that the second radiator 78 excites a fourth mode to generate a radiation signal of a fourth frequency band. In this embodiment, the fourth mode is an LTE-a high frequency mode, and the fourth frequency band is 2300-.

One end of the third switching circuit 79 is electrically connected to the middle position of the second radiator 78, and the other end is electrically connected to the back plate 712 or to the shield case or the middle frame, i.e., to ground. The third switching circuit 79 is used for adjusting the frequency band of the high-frequency mode of the second radiator 78, and the specific circuit structure and the working principle thereof can refer to the description of the first switching circuit 75 in fig. 63, which is not described herein again.

Fig. 69 is a schematic diagram of the current trend of the antenna structure 700 operating in the low frequency mode. Obviously, when the current enters from the first feeding source S1, the current flows through the first radiation segment 734, the second radiation segment 735, and the third radiation segment 736 of the first radiation part 731 in sequence, and is coupled to the metal long arm F1 through the third radiation segment 736, then flows through the first side 716 from the metal long arm F1, and finally flows to the back plate 712 (see path J1) on the back side, so as to excite the first mode to generate the radiation signal of the first frequency band. In addition, since the antenna structure 700 is provided with the first switching circuit 75 and the second switching circuit 76, the low-frequency mode of the metal long arm F1 can be switched by the cooperation of the first switching circuit 75 and the second switching circuit 76, and the medium-frequency and high-frequency operations are not affected.

Fig. 70 is a schematic diagram of the current trend when the antenna structure 700 operates in the intermediate frequency modes (1710-2170MHz band and 2110-2170MHz band). Obviously, when current enters from the first feeding source S1, the current flows directly into the short metal arm F2 through the second radiation portion 733, then flows through the second side portion 717, and finally flows into the back plate 712 (see path J2), so as to excite the second mode to generate the radiation signal of the second frequency band. Meanwhile, when a current enters from the first feeding source S1, the current flows into the short metal arm F2 through the second radiation portion 733, then is coupled to the long metal arm F1 through the break 720, and flows into the resonant circuit 77 in the first switching circuit 75, and finally flows to the back plate 712 (see path J3). This causes the metal long arm F1 to excite the third mode to generate a radiation signal of a third frequency band by the coupling effect of the break point 720 and the resonant circuit 77. As can be seen from fig. 63 and 70, the back plate 712 corresponds to the ground of the antenna structure 700.

Fig. 71 is a schematic diagram of a current trend when the antenna structure 700 operates in high-frequency modes (2300-. When the current enters the second radiator 78 from the second feeding source S2, the current flows to one end (refer to path J4) of the second radiator 78 far from the second feeding source S2, so as to excite a fourth mode to generate a radiation signal of a fourth frequency band. In addition, since the antenna structure 700 is provided with the third switching circuit 79 connected to the ground, the frequency of the high-frequency mode can be switched by the third switching circuit 79.

Fig. 72 is a graph of the S-parameter (scattering parameter) of the antenna structure 700 operating in the low frequency mode. Wherein the curve S721 is the S11 value when the antenna structure 700 operates at 704-746MHz (LTE Band17 Band). The curve S722 is the S11 value when the antenna structure 700 operates at 746-787MHz (LTE Band13 Band). The curve S723 is the S11 value when the antenna structure 700 operates at 824-894MHz (LTE Band5 frequency Band). The curve S724 shows the S11 value of the antenna structure 700 operating at 880-960MHz (LTE Band8 Band). Obviously, the curves S721-S724 correspond to four different frequency bands respectively, and correspond to four of the low frequency modes switchable by the first switching circuit 75 and the second switching circuit 76 respectively.

Fig. 73 is a graph of the radiation efficiency of the antenna structure 700 operating in the low frequency mode. The curve S731 shows the radiation efficiency of the antenna structure 700 when operating at 704-746MHz (LTE Band17 Band). Curve S732 shows the radiation efficiency of the antenna structure 700 operating at 746-787MHz (LTE Band13 Band). The curve S733 shows the radiation efficiency of the antenna structure 700 operating at 824-894MHz (LTE Band5 Band). Curve S734 shows the radiation efficiency of the antenna structure 700 when operating at 880-960MHz (LTE Band8 Band). Obviously, the curves S731 to S734 correspond to four different frequency bands respectively, and correspond to four of the low frequency modes switchable by the first switching circuit 75 and the second switching circuit 76 respectively.

Fig. 74 is a graph of S-parameters (scattering parameters) when the antenna structure 700 operates in the middle frequency band (i.e., 1710-. Fig. 75 is a graph of the radiation efficiency of the antenna structure 700 operating in the middle frequency band (i.e., 1710-.

Fig. 76 is a graph of S-parameters (scattering parameters) when the antenna structure 700 operates in the high frequency band (i.e., 2300-. Fig. 77 is a graph of the radiation efficiency of the antenna structure 700 operating in the high frequency band (i.e., 2300-. Obviously, when the switching unit in the third switching circuit 79 in the antenna structure 700 is switched to different switching elements (for example, four different switching elements), each switching element has different impedance, so that the frequency of the antenna structure 700 at high frequency can be effectively adjusted by the switching of the switching unit, and a better operation bandwidth is obtained.

It is apparent from fig. 72 to 77 that the antenna structure 700 can operate in a corresponding low frequency Band, such as the LTE Band17/13/5/8 Band. In addition, the antenna structure 700 can also work in the middle frequency band (1710-.

That is, in the present embodiment, the antenna structure 700 is configured by disposing the first radiator 73 such that the first radiation part 731 of the first radiator 73 and the metal long arm F1 form a coupling structure, and the second radiation part 733 is directly electrically connected to the metal short arm F2. That is, the first radiator 73, the metal long arm F1 and the metal short arm F2 form a half-coupling feed structure, so that the metal long arm F1 and the metal short arm F2 respectively excite a corresponding first mode and a corresponding second mode. The semi-coupled feeding structure can make the antenna structure 700 have more flexible adjustment and effectively reduce the non-metal range required by the antenna structure. In addition, the antenna structure 700 can effectively adjust and switch the first mode (i.e. the low frequency mode) through the arrangement of the first switching circuit 75 and the second switching circuit 76, and the metal long arm F1 additionally resonates out an intermediate frequency mode (i.e. the third mode) due to the arrangement of the resonant circuit 77. Furthermore, the antenna structure 700 can excite the antenna structure 700 to generate a corresponding high-frequency mode through the arrangement of the second radiator 78 and the third switching circuit 79, and can effectively adjust the frequency of the antenna structure 700 at a high frequency, thereby obtaining a better operation bandwidth.

Referring to fig. 78, an antenna structure 700a according to a seventh preferred embodiment of the invention is shown. The antenna structure 700a includes a housing 71, a first feeding source S1, a first radiator 83, a first switching circuit 75, a second switching circuit 76, a resonant circuit 77, a second radiator 78, a second feeding source S2, and a third switching circuit 79. The housing 71 includes a front frame 711, a back plate 712, and a bezel 713. The frame 713 includes at least a tip portion 715, a first side portion 716, and a second side portion 717. The frame 713 is further provided with a slot 719, and the front frame 711 is further provided with a break point 720. The break 720 divides the front frame 711 into two parts, which include a metal long arm F1 and a metal short arm F2.

The first radiator 83 includes a first radiation portion 731 and a second radiation portion 831. The first radiation portion 731 includes a first radiation segment 734, a second radiation segment 735, and a third radiation segment 736. The third radiation segment 736 is coupled to the metal long arm F1 at a distance, so that the first radiation part 731 and the metal long arm F1 form a coupling structure.

It is understood that the antenna structure 700a differs from the antenna structure 700 in that the specific structure of the second radiation portion 831 in the antenna structure 700a is different from the specific structure of the second radiation portion 733 in the antenna structure 700, and the connection relationship between the second radiation portion 831 and the short metal arm F2 is different from the connection relationship between the second radiation portion 733 and the short metal arm F2 in the antenna structure 700.

Specifically, in the present embodiment, the second radiation portion 831 and the first radiation portion 731 are symmetrically disposed with respect to the first feeding source S1. The second radiation portion 831 includes a first coupling segment 832, a second coupling segment 833 and a third coupling segment 834. The first coupling segment 832, the second coupling segment 833 and the third coupling segment 834 are arranged in a coplanar manner. The first coupling segment 832 is substantially rectangular and has one end electrically connected to the first radiating segment 734 and the matching circuit 81 of the first feeding source S1, and extends along a direction parallel to the end portion 715 and close to the second side portion 717 so as to be aligned with the first radiating segment 734. The second coupling segment 833 is substantially rectangular and has one end vertically connected to one end of the first coupling segment 832 far from the first feed source S1, and extends in a direction parallel to the second radiation segment 735 and close to the end portion 715, so as to form a pi-shaped structure together with the first radiation segment 734, the second radiation segment 735 and the first coupling segment 832. The third coupling segment 834 is substantially in the shape of a rectangular bar, and is spaced from and parallel to the short metal arm F2. The third coupling segment 834 is electrically connected to an end of the second coupling segment 833 far from the first coupling segment 832, and extends in a direction close to the first side 716 and the second side 717, respectively, so as to form a substantially T-shaped structure with the second coupling segment 833.

It can be understood that when the antenna structure 700a operates in the low frequency mode, the current direction of the antenna structure 700a is the same as the current direction when the antenna structure operates in the low frequency mode, which is specifically referred to fig. 69 and will not be described herein again.

Fig. 79 is a schematic diagram of the current trend when the antenna structure 700a operates in the intermediate frequency modes (1710-2170MHz and 2110-2170 MHz). Obviously, when a current enters from the first feeding source S1, the current flows through the first coupling segment 832, the second coupling segment 833 and the third coupling segment 834 of the second radiation portion 831 in sequence, and is coupled to the short metal arm F2 via the third coupling segment 834, then flows through the second side portion 717 from the short metal arm F2, and finally flows to the back plate 712 (see path J5) on the back side, so as to excite the second mode to generate a radiation signal in the second frequency band. Meanwhile, when a current enters from the first feeding source S1, the current will be coupled to the short metal arm F2 through the third coupling segment 834, then coupled to the long metal arm F1 through the break 720, and flow to the resonant circuit 77 in the first switching circuit 75, and finally flow to the back plate 712 (see path J6). Thus, the coupling effect of the break point 720 is coupled with the resonant circuit 77, so as to excite the third mode to generate a radiation signal of a third frequency band.

It can be understood that when the antenna structure 700a operates in the high-frequency mode, the current direction of the antenna structure 700a is consistent with the current direction of the antenna structure operating in the high-frequency mode, which is specifically referred to fig. 71 and will not be described herein again.

Fig. 80 is a graph of the S-parameter (scattering parameter) of the antenna structure 700a operating in the low frequency mode. The curve S801 is the S11 value when the antenna structure 700a operates at 704-746MHz (LTE Band17 Band). The curve S802 is the S11 value of the antenna structure 700a operating at 746-787MHz (LTE Band13 Band). The curve S803 is the S11 value when the antenna structure 700a operates in 824-894MHz (LTE Band5 Band). The curve S804 is the S11 value when the antenna structure 700a operates at 880-960MHz (LTE Band8 Band). Obviously, the curves S801 to S804 respectively correspond to four different frequency bands, and respectively correspond to four of the plurality of low frequency modes switchable by the first switching circuit 75 and the second switching circuit 76.

Fig. 81 is a graph of the radiation efficiency of the antenna structure 700a operating in the low frequency mode. The curve S811 is the radiation efficiency of the antenna structure 700a when operating at 704-746MHz (LTE Band17 Band). The curve S812 shows the radiation efficiency of the antenna structure 700a when operating at 746-787MHz (LTE Band13 Band). The curve S8123 shows the radiation efficiency of the antenna structure 700a when operating at 824-894MHz (LTE Band5 Band). Curve S814 shows the radiation efficiency of the antenna structure 700a when operating at 880-960MHz (LTE Band8 Band). Obviously, the curves S811-S814 correspond to four different frequency bands, and correspond to four of the low frequency modes switchable by the first switching circuit 75 and the second switching circuit 76, respectively.

Fig. 82 is a graph of S-parameters (scattering parameters) when the antenna structure 700a operates in the middle frequency band (i.e., 1710-. Fig. 83 is a graph of the radiation efficiency of the antenna structure 700a operating in the middle frequency band (i.e., 1710-.

The S-parameters (scattering parameters) of the antenna structure 700a operating in the high frequency band (i.e., 2300-.

It can be understood that, in the present embodiment, the antenna structure 700a is configured by disposing the first radiator 83 such that the first radiation part 731 of the first radiator 83 and the metal long arm F1 form a coupling structure, and the second radiation part 831 and the metal short arm F2 form a coupling structure. That is, the first radiator 83, the metal long arm F1 and the metal short arm F2 form a fully coupled feeding structure, so that the metal long arm F1 and the metal short arm F2 respectively excite a corresponding first mode and a corresponding second mode. The arrangement of the fully-coupled feeding structure can make the antenna structure 700 have more flexible adjustment, and can effectively reduce the non-metal range required by the antenna structure 700 a. In addition, the antenna structure 700a can effectively adjust and switch the first mode (i.e. the low frequency mode) through the arrangement of the first switching circuit 75 and the second switching circuit 76, and the metal long arm F1 additionally resonates out an intermediate frequency mode (i.e. the third mode) due to the arrangement of the resonant circuit 77. Furthermore, the antenna structure 700a can excite the antenna structure 700a to generate a corresponding high-frequency mode through the arrangement of the second radiator 78 and the third switching circuit 79, and can effectively adjust the frequency of the antenna structure 700a at high frequency, so as to obtain a better operation bandwidth.

As described in the previous embodiments, the first radiator 73/83 is disposed by being coupled to the metal long arm F1 at a distance, so that the metal long arm F1 can excite the first mode to generate a radiation signal in a low frequency band. Meanwhile, the first radiator 73/83 is coupled to the short metal arm F2 at an interval or directly electrically connected to the short metal arm F2, so that the short metal arm F2 excites a second mode to generate a radiation signal in an intermediate frequency band. That is, the first radiator 73/83 can form a half-coupled feeding structure or a full-coupled feeding structure with the metal long arm F1 and the metal short arm F2, so that the metal long arm F1 and the metal short arm F2 jointly excite a first mode and a second mode. Meanwhile, the metal long arm F1 and the metal short arm F2 can be coupled via the break point 720 and are matched with the resonant circuit 77, so that the metal long arm F1 additionally excites a corresponding third mode to generate a radiation signal in a medium frequency band, and the second radiator 78 excites a fourth mode to generate a radiation signal in a high frequency band. Therefore, the wireless communication apparatus 800 can simultaneously receive or transmit wireless signals in a plurality of different frequency bands using Carrier Aggregation (CA) technology of LTE-Advanced (LTE-Advanced) to increase transmission bandwidth. More specifically, the wireless communication device 800 may receive or transmit wireless signals in a plurality of different frequency bands simultaneously using the carrier aggregation technique and using at least two of the metallic long arm F1, the metallic short arm F2, the first radiator 73/83, and the second radiator 78.

The antenna structure 100 according to the first preferred embodiment of the present invention, the antenna structure 200 according to the second preferred embodiment of the present invention, the antenna structure 500 according to the third preferred embodiment of the present invention, the antenna structure 500a according to the fourth preferred embodiment of the present invention, the antenna structure 500b according to the fifth preferred embodiment of the present invention, the antenna structure 700 according to the sixth preferred embodiment of the present invention, and the antenna structure 700a according to the seventh preferred embodiment of the present invention can be applied to the same wireless communication device. For example,

antenna structure

100 or 200 is disposed at the upper end of the wireless communication device as a secondary antenna and

antenna structure

500, 500a, 500b, 700 or 700a is disposed at the lower end of the wireless communication device as a primary antenna. When the wireless communication apparatus transmits a wireless signal, the wireless communication apparatus transmits the wireless signal using the main antenna. When the wireless communication apparatus receives a wireless signal, the wireless communication apparatus receives the wireless signal using the main antenna and the sub antenna together.

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

Claims

1. An antenna structure comprises a shell, a first feed-in source and a first radiating body, wherein the shell comprises a front frame, a back plate and a frame, the frame is clamped between the front frame and the back plate, a groove is formed in the frame, a breakpoint is formed in the front frame, the breakpoint is communicated with the groove and extends to the front frame, the groove and the breakpoint divide a metal long arm and a metal short arm from the shell, the first radiating body is arranged in the shell and comprises a first radiating part and a second radiating part, the first radiating part comprises a first radiating section, a second radiating section and a third radiating section which are sequentially connected, one end of the first radiating section is electrically connected to the first feed-in source, and the third radiating section is in spaced coupling arrangement with the metal long arm and is used for coupling current to the metal long arm; the structure of the second radiation part is the same as that of the first radiation part, the first radiation part and the second radiation part are symmetrically arranged at two sides of the breakpoint and are symmetrically connected to the first feed-in source, one end of the second radiation part is electrically connected to the first feed-in source, and the other end of the second radiation part is in spaced coupling arrangement with the metal short arm.

2. The antenna structure of claim 1, characterized in that: and insulating materials are filled in the slots and the breakpoints.

3. The antenna structure of claim 1, characterized in that: the frame at least comprises a terminal part, a first side part and a second side part, the first side part and the second side part are respectively connected with two ends of the terminal part, the slot is at least arranged on the terminal part, the other end of the first radiation section extends along a direction parallel to the terminal part and close to the first side part until crossing the breakpoint, one end of the second radiation section is vertically connected to one end of the first radiation section far away from the first feed-in source, the other end of the second radiation section extends along a direction parallel to the second side part and close to the metal long arm so as to form an L-shaped structure with the first radiation section, the third radiation section is spaced from and parallel to the metal long arm, the third radiation section is vertically connected to the end part of the second radiation section far away from the first radiation section and extends along a direction close to the first side part and the second side part respectively, and then forms a T-shaped structure with the second radiation section.

4. The antenna structure of claim 3, characterized in that: the front frame on one side of the break point and the part of the front frame, which extends to the position corresponding to one end point of the slot, form the metal long arm together, when current enters from the first feed source, the current flows through the first radiation section, the second radiation section and the third radiation section in sequence, is coupled to the metal long arm through the third radiation section, flows through the first side part from the metal long arm, and finally flows to the back plate, so that a first mode is excited to generate a radiation signal of a first frequency band.

5. The antenna structure of claim 4, characterized in that: the antenna structure further comprises a first switching circuit and a second switching circuit, wherein the first switching circuit comprises a first switching unit and at least one first switching element, the first switching unit is electrically connected to the metal long arm, the first switching elements are connected in parallel, one end of each first switching element is electrically connected to the first switching unit, the other end of each first switching element is electrically connected to the backboard, the second switching circuit comprises a second switching unit and at least one second switching element, the second switching unit is electrically connected to the first feed-in source and the first radiator through a matching circuit, the second switching elements are connected in parallel, one end of each second switching element is electrically connected to the second switching unit, the other end of each second switching element is electrically connected to the backboard, and the first switching unit and the second switching unit are switched to different first switching elements and/or second switching elements by controlling the switching of the first switching unit and/or the second switching unit, thereby adjusting the first frequency band.

6. The antenna structure of claim 5, characterized in that: the second radiation part comprises a first coupling section, a second coupling section and a third coupling section which are sequentially connected, one end of the first coupling section is electrically connected to the first radiation section and the first feed-in source, and extends along a direction parallel to the tail end part and close to the second side part so as to be positioned on the same straight line with the first radiation section, one end of the second coupling section is vertically connected to one end of the first coupling section, which is far away from the first feed-in source, and extends along a direction parallel to the second radiation section and close to the tail end part, so that the first radiation section, the second radiation section and the first coupling section form a pi-shaped structure together, the third coupling section is spaced from and arranged in parallel with the metal short arm, one end of the third coupling section is electrically connected to one end of the second coupling section, which is far away from the first coupling section, and extends along a direction close to the first side part and the second side part respectively, and then forms a T-shaped structure with the second coupling section.

7. The antenna structure of claim 6, characterized in that: the front frame on the other side of the break point extends to a part corresponding to the other end point of the slot to form the short metal arm together, the long metal arm is longer than the short metal arm, when current enters from the first feed-in source, the current flows through the first coupling segment, the second coupling segment and the third coupling segment, is coupled to the short metal arm through the third coupling segment, then flows through the second side part from the short metal arm, finally flows to the back plate, and further excites a second mode to generate a radiation signal of a second frequency band, the frequency of the second frequency band is higher than that of the first frequency band, and when current enters from the first feed-in source, the current is coupled to the short metal arm through the third coupling segment, then is coupled to the long metal arm through the break point, and flows to the first switching circuit, and finally, the radiation signals flow to the back plate, and a third mode is excited to generate radiation signals of a third frequency band, wherein the frequency of the third frequency band is higher than that of the second frequency band.

8. The antenna structure of claim 7, characterized in that: the antenna structure further comprises one resonant circuit, and the resonant circuit is electrically connected between the metal long arm and the back plate.

9. The antenna structure of claim 7, characterized in that: the antenna structure further comprises resonant circuits, the number of the resonant circuits is consistent with that of the first switching elements, each resonant circuit is connected in parallel with the corresponding first switching element between the first switching unit and the back plate, and the resonant circuits are used for keeping the third frequency band unchanged when the first frequency band is adjusted.

10. The antenna structure of claim 7, characterized in that: the antenna structure further comprises resonant circuits, the number of the resonant circuits is consistent with that of the first switching elements, each resonant circuit is connected in parallel with the corresponding first switching element between the first switching unit and the back plate, and the resonant circuits are used for correspondingly adjusting the third frequency band when the first frequency band is adjusted.

11. The antenna structure of claim 3, characterized in that: the antenna structure further comprises a second radiator and a second feed-in source, the second radiator is adjacent to the metal long arm, the second radiator is a straight strip-shaped sheet body, one end of the second radiator is electrically connected to the front frame, the other end of the second radiator faces the second side portion and extends, the second feed-in source is arranged on the front frame and is electrically connected to the second radiator, and when current enters the second feed-in source, the current flows through the second radiator to excite a fourth mode to generate a radiation signal of a fourth frequency band.

12. The antenna structure of claim 11, characterized in that: the antenna structure further comprises a third switching circuit, wherein one end of the third switching circuit is electrically connected to the second radiator, and the other end of the third switching circuit is electrically connected to the back plate for adjusting the fourth frequency band.

13. The antenna structure of claim 11, characterized in that: the wireless communication device receives or transmits wireless signals in a plurality of different frequency bands simultaneously using a carrier aggregation technique and using at least two of the first radiator, the second radiator, the metal long arm, and the metal short arm.

14. The antenna structure of claim 1, characterized in that: the back plate is a single metal sheet which is integrally formed, the back plate is directly connected with the frame, no gap exists between the back plate and the frame, and no insulating slot, broken line or breakpoint used for dividing the back plate is arranged on the back plate.

15. A wireless communication device comprising an antenna structure as claimed in any one of claims 1 to 14.

16. The wireless communications apparatus of claim 15, wherein: the wireless communication device further comprises a display unit, the front frame, the back plate and the frame form a shell of the wireless communication device, the front frame is provided with an opening for accommodating the display unit, the display unit is provided with a display plane, the display plane is exposed in the opening, and the display plane and the back plate are arranged in parallel.

17. The wireless communications apparatus of claim 15, wherein: the wireless communication device further comprises a USB module, a port is further formed in the frame and corresponds to the USB module, and the USB module is partially exposed out of the port.