TW202002402A - Antenna structure and wireless communication device using the same - Google Patents

Abstract

An antenna structure includes a back plate, a side frame and a feeding portion. The back plate defines a slot. The side frame defines a first gap and a second gap. The side frame is divided into a first radiating portion and a second radiating portion by the slot, the first gap and the second gap. A portion of the side frame between the first gap and the second gap forms the first radiating portion. A portion of the side frame extending from a side of the second gap away from the first radiating portion and the first gap forms the second radiating portion. The feeding portion is electrically connected to the first radiating portion. When a current is fed from the feeding portion, the current flows through the first radiating portion, and is coupled to the second radiating portion. A wireless communication device having the antenna structure is also provided.

Description

Antenna structure and wireless communication device with the antenna structure

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

With the advancement of wireless communication technology, electronic devices such as mobile phones and personal digital assistants continue to develop toward the trend of diversified functions, thinner and thinner, and faster and more efficient data transmission. However, the space that can accommodate the antenna is getting smaller and smaller, and with the continuous development of wireless communication technology, the bandwidth requirements of the antenna are increasing. Therefore, how to design an antenna with a wider bandwidth in a limited space is an important issue facing antenna design.

In view of this, it is necessary to provide an antenna structure and a wireless communication device having the antenna structure.

An embodiment of the present invention provides an antenna structure applied to a wireless communication device. The antenna structure includes a housing, a feed-in portion, a first grounding portion, and a second grounding portion. The housing includes at least a backplane and a frame. The frame is provided on the periphery of the back plate, a slot is provided on the back plate, a first break point and a second break point are provided on the frame, the slot is opened on the edge of the back plate and The frame is arranged in parallel, and one of the first breakpoint and the second breakpoint is opened at one end of the slot; the slot, the first breakpoint, and the second breakpoint are jointly divided from the frame A first radiating portion and a second radiating portion are provided at intervals, the frame between the first breakpoint and the second breakpoint constitutes the first radiating portion, and the second breakpoint is away from the The first radiating portion and the frame on the side of the first breakpoint constitute the second radiating portion, the first grounding portion is electrically connected to the second radiating portion, and the second grounding portion is electrically connected to the A first radiating part, the feeding part is electrically connected to the first radiating part; when a current is fed from the feeding part, the current flows through the first radiating part and is coupled to the second radiation unit.

An embodiment of the present invention provides a wireless communication device including the antenna structure.

The above antenna structure and the wireless communication device with the antenna structure can cover the LTE-A low frequency band, the LTE-A intermediate frequency band and the LTE-A high frequency band, and the frequency range is relatively wide.

The technical solutions in the embodiments of the present invention will be described clearly and completely in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.

It should be noted that when an element is called "electrically connected" to another element, it may be directly on the other element or there may be a centered element. When an element is considered to be "electrically connected" to another element, it may be a contact connection, for example, a wire connection, or a contactless connection, for example, a contactless coupling.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field of the present invention. The terminology used in the description of the present invention herein is for the purpose of describing specific embodiments, and is not intended to limit the present invention. The term "and/or" as used herein includes any and all combinations of one or more related listed items.

The following describes some embodiments of the present invention in detail with reference to the accompanying drawings. In the case of no conflict, the following embodiments and the features in the embodiments can be combined with each other.

Please refer to FIG. 1 and FIG. 2, the first preferred embodiment of the present invention provides an antenna structure 100, which can be applied to wireless communication devices 200 such as mobile phones, personal digital assistants, etc. for transmitting and receiving radio waves for transmission and exchange Wireless signal.

Please refer to FIG. 3 together. The antenna structure 100 at least includes a housing 11, a feeding portion 12, a first switching circuit 13, a second switching circuit 14, a first ground portion 15, a second ground portion 16 and a matching circuit 17.

The casing 11 may be a casing of the wireless communication device 200. The casing 11 includes at least a frame 112 and a back plate 113. Both the frame 112 and the back plate 113 are made of metal material. The frame 112 has a substantially annular structure, and is disposed on the periphery of the back plate 113. In this embodiment, the frame 112 and the back plate 113 are integrally formed. An opening (not shown) is provided on the side of the frame 112 away from the back plate 113 for accommodating the display unit 201 of the wireless communication device 200. It can be understood that the display unit 201 has a display plane, and the display plane is exposed at the opening.

The back plate 113 and the display plane of the display unit 201 are substantially parallel to each other. It can be understood that, in this embodiment, the back plate 113 and the frame 112 together form an accommodating space 114. The accommodating space 114 is used for accommodating electronic components or circuit modules such as the substrate and the processing unit of the wireless communication device 200 therein. It can be understood that, in this embodiment, the display unit 201 may be a full-screen structure. In other embodiments, the display unit 201 may have a non-full-screen structure, that is to say, at least one notch (not shown) may be formed on the display unit 201.

The frame 112 at least includes an end portion 115, a first side portion 116 and a second side portion 117. In this embodiment, the end portion 115 may be the bottom end of the wireless communication device 200, that is, the antenna structure 100 constitutes a lower antenna of the wireless communication device 200. The first side portion 116 is disposed opposite to the second side portion 117, and the two are respectively disposed at both ends of the end portion 115, preferably vertically.

A slot 120 is defined in the back plate 113. A first breakpoint 118 and a second breakpoint 119 are defined on the frame 112. In this embodiment, the first break point 118 is opened at a position of the first side portion 116 close to the end portion 115, and the first break point 118 is opened at one end of the slot 120. The second breakpoint 119 is opened at a position of the end portion 115 close to the second side portion 117. The slot 120 is opened at the edge of the back plate 113 and is disposed parallel to the frame 112. The slot 120 has a generally inverted U-shaped structure, which is opened inside the end portion 115 and extends toward the direction of the first side portion 116 and the second side portion 117 respectively, so that the end portion 115 It is insulated from the back plate 113.

Both the first breakpoint 118 and the second breakpoint 119 communicate with the slot 120 and extend to cut off the frame 112. In this embodiment, the slot 120, the first breakpoint 118, and the second breakpoint 119 together define a first radiating portion E1 and a second radiating portion E2 that are spaced apart from the frame 112. In this embodiment, the frame 112 between the first break point 118 and the second break point 119 constitutes the first radiating portion E1. The second break point 119 is away from the first radiation part E1 and the frame 112 on the side of the first break point 118 constitutes the second radiation part E2.

In this embodiment, the first radiating portion E1 and the back plate 113 are spaced apart and insulated by the slot 120 and the first break point 118. The side of the second radiating portion E2 away from the second break point 119 is connected to the frame 112, so that the second radiating portion E2, the frame 112 and the back plate 113 form an integrally formed body Border body.

In this embodiment, the widths of the first breakpoint 118 and the second breakpoint 119 are both D1. The width of the slot 120 is D2. In this embodiment, the width D1 of the first breakpoint 118 and the second breakpoint 119 are both 1-3 mm. The width D2 of the slot 120 is 0.5-1.5 mm. The first radiating portion E1 and the second radiating portion E2 are at least 1 mm away from the metal element in the accommodating space 114. The first radiation part E1 and the second radiation part E2 are at least 1 mm away from the metal element in the display unit 201.

It can be understood that in this embodiment, the first breakpoint 118, the second breakpoint 119, and the slot 120 are filled with insulating materials, such as plastic, rubber, glass, wood, ceramic, etc., but Not limited to this.

It can be understood that, in other embodiments, the shape of the slot 120 is not limited to the above-mentioned U-shape, and it can also be adjusted according to specific requirements, for example, it can also be straight, diagonal, zigzag, etc. .

Obviously, the shape and position of the slot 120 and the positions of the first breakpoint 118 and the second breakpoint 119 on the frame 112 can be adjusted according to specific needs, and only the slot 120, The first breakpoint 118 and the second breakpoint 119 may be divided into the first radiating portion E1 and the second radiating portion E2 that are spaced apart from the housing 11.

In this embodiment, the antenna structure 100 further includes a first ground point 210, a second ground point 211, and a feeding point 212. The first ground point 210 and the second ground point 211 are spaced apart to provide ground for the antenna structure 100. The feeding point 212 is disposed between the first grounding point 210 and the second grounding point 211 to feed current to the antenna structure 100.

In this embodiment, the wireless communication device 200 further includes at least one electronic component. In this embodiment, the wireless communication device 200 includes at least two electronic components, namely a first electronic component 215 and a second electronic component 216. The first electronic component 215 and the second electronic component 216 are both disposed in the accommodating space 114. The first electronic component 215 is a universal serial bus (USB) interface module, which is disposed between the second ground point 211 and the feeding point 212. The second electronic component 216 is a speaker, which is disposed on a side of the second ground point 211 away from the first electronic component 215.

It can be understood that the positions of the first electronic component 215 and the second electronic component 216 can be adjusted according to specific requirements. Both the first electronic component 215 and the second electronic component 216 are insulated from the first radiating portion E1 through the slot 120.

It can be understood that, in this embodiment, the frame 112 is further provided with a port 23. The port 23 is opened at a middle position of the end portion 115 and penetrates the end portion 115. The port 23 corresponds to the first electronic component 215 so that the first electronic component 215 is partially exposed from the port 23. In this way, the user can insert a USB device through the port 23 to establish an electrical connection with the first electronic component 215.

The feeding portion 12 is disposed inside the housing 11 and is located between the first electronic component 215 and the second break point 119. One end of the feeding part 12 is electrically connected to the first radiating part E1, and the other end is electrically connected to the feeding point 212 through the matching circuit 17 to feed a current signal to the first radiating part E1 . It can be understood that in this embodiment, the matching circuit 17 may be an L-type matching circuit, a T-type matching circuit, a π-type matching circuit, or other capacitors, inductors, and a combination of capacitors and inductors to adjust the first radiation The impedance of section E1 is matched.

It can be understood that, in this embodiment, the feeding part 12 is further used to further divide the first radiating part E1 into two parts, namely a first radiating section E11 and a second radiating section E12. Wherein, the frame 112 between the feeding portion 12 and the first break point 118 forms the first radiating section E11. The frame 112 between the feeding portion 12 and the second breakpoint 119 forms the second radiating section E12. In this embodiment, the position of the feeding portion 12 does not correspond to the middle of the first radiating portion E1, so the length of the first radiating section E11 is greater than the length of the second radiating section E12.

In this embodiment, the first grounding portion 15 is provided inside the housing 11 and is located between the second break point 119 and the second side portion 117. One end of the first ground portion 15 is electrically connected to the first ground point 210 through the first switching circuit 13, and the other end is electrically connected to the end of the second radiating portion E2 near the second break point 119 To provide a ground for the second radiating part E2.

The second grounding portion 16 is disposed inside the housing 11 and is located between the first electronic component 215 and the second electronic component 216. The distance between the second ground 16 and the first electronic component 215 is smaller than the distance between the second ground 16 and the second electronic component 216. One end of the second grounding portion 16 is electrically connected to the first radiating portion E1, and the other end is electrically connected to the second grounding point 211 through the second switching circuit 14 to be the first radiating portion E1 Provide grounding.

It can be understood that please refer to FIG. 4 together, when the current is fed from the feeding point 212, the current will flow through the matching circuit 17 and the first radiating section E11 in sequence and flow to the The first breakpoint 118 causes the first radiation section E11 to excite the first mode to generate a radiation signal in the first frequency band (see path P1). In addition, after the current is fed from the feeding point 212, the current will also flow through the matching circuit 17 and the second radiating section E12 in sequence, and coupled through the second break point 119 To the second radiating part E2, and is grounded by the first grounding point 210, so that the second radiating part E2 excites a second mode to generate a radiation signal of a second frequency band (see path P2).

In this embodiment, the first mode is a long-term evolution technology upgrade (LTE-Advanced, LTE-A) low-frequency mode. The second mode includes LTE-A intermediate frequency mode and LTE-A high frequency mode. The frequency of the second frequency band is higher than the frequency of the first frequency band. The frequency of the first frequency band is 700-960 MHz. The frequency of the second frequency band is 1710-2690 MHz.

It can be understood that, in this embodiment, the feed point 212 excites the corresponding LTE-A low-frequency mode through the first radiation segment E11. The feeding point 212 then couples the current to the second radiating portion E2 through the second radiating section E12 to excite the corresponding LTE-A intermediate frequency mode and LTE-A high frequency mode. That is to say, the first radiating part E1 and the second radiating part E2 can jointly excite the LTE-A low frequency mode, the LTE-A intermediate frequency mode and the LTE-A high frequency mode through the feed point 212 to To meet the needs of dual-frequency bands, it covers the frequency range of 700-960MHz and 1710-2690MHz.

Obviously, in this embodiment, the feeding portion 12 and the first radiating portion E1 constitute a first antenna. The feeding portion 12 and the second radiating portion E2 constitute a second antenna.

Please refer to FIG. 5 together. In this embodiment, the first switching circuit 13 includes a first switching unit 131 and at least one first switching element 133. The first switching unit 131 may be a single-pole single-throw switch, a single-pole double-throw switch, a single-pole three-throw switch, a single-pole four-throw switch, a single-pole six-throw switch, a single-pole eight-throw switch, and the like. The first switching unit 131 is electrically connected to the second radiating portion E2. The first switching element 133 may be an inductor, a capacitor, or a combination of an inductor and a capacitor. The first switching elements 133 are connected in parallel with each other, and one end of the first switching element 133 is electrically connected to the first switching unit 131, and the other end is electrically connected to the first ground point 210, that is, ground. In this way, by controlling the switching of the first switching unit 131, the second radiating portion E2 can be switched to a different first switching element 133 to adjust the second frequency band of the second radiating portion E2.

For example, in this embodiment, the first switching circuit 13 may include four first switching elements 133 having different impedances. By switching the second radiating part E2 to four different first switching elements 133, the high frequency of the second mode in the antenna structure 100 can be respectively covered to the LTE-A Band3 frequency band (1710-1880MHz) , LTE-A Band1 frequency band (1920-2170MHz), LTE-A Band41 frequency band (2496-2690MHz) and LTE-A Band40 frequency band (2300-2400MHz).

Please refer to FIG. 6 together. In this embodiment, the second switching circuit 14 includes a second switching unit 141 and at least one second switching element 143. The second switching unit 141 may be a single-pole single-throw switch, a single-pole double-throw switch, a single-pole three-throw switch, a single-pole four-throw switch, a single-pole six-throw switch, a single-pole eight-throw switch, and the like. The second switching unit 141 is electrically connected to the first radiation part E1. The second switching element 143 may be an inductor, a capacitor, or a combination of an inductor and a capacitor. The second switching elements 143 are connected in parallel with each other, and one end thereof is electrically connected to the second switching unit 141, and the other end is electrically connected to the second ground point 211, that is, ground. In this way, by controlling the switching of the second switching unit 141, the first radiating portion E1 can be switched to a different second switching element 143. Since each second switching element 143 has a different impedance, the first frequency band of the first radiation portion E1 can be adjusted by the second switching unit 141 switching.

For example, in this embodiment, the second switching circuit 14 may include four second switching elements 143 having different impedances. By switching the first radiating portion E1 to four different second switching elements 143, the low frequencies of the first mode in the antenna structure 100 can be respectively covered to the LTE-A Band8 frequency band (880-960MHz), LTE-A Band5 frequency band (824-894MHz), LTE-A Band13 frequency band (746-787MHz) and LTE-A Band17 frequency band (704-746MHz).

7 is an S-parameter of the antenna structure 100 when the antenna structure 100 works in the LTE-A low-frequency mode when the second switching unit 141 in the second switching circuit 14 shown in FIG. 6 switches to a different second switching element 143 (Scattering parameter) graph. The curve S801 is the S11 value when the first antenna is switched to one of the second switching elements 143, so that the antenna structure 100 works in the LTE-A Band8 frequency band (880-960MHz). The curve S802 is the S11 value when the first antenna is switched to one of the second switching elements 143 so that the antenna structure 100 works in the LTE-A Band5 frequency band (824-894 MHz). The curve S803 is the S11 value when the first antenna is switched to one of the second switching elements 143 so that the antenna structure 100 works in the LTE-A Band13 frequency band (746-787 MHz). The curve S804 is the S11 value when the first antenna is switched to one of the second switching elements 143 so that the antenna structure 100 works in the LTE-A Band17 frequency band (704-746 MHz).

FIG. 8 is the total radiation when the antenna structure 100 works in the LTE-A low frequency mode when the second switching unit 141 in the second switching circuit 14 shown in FIG. 6 switches to a different second switching element 143 Efficiency graph. The curve S901 is a graph of the total radiation efficiency when the first antenna is switched to one of the second switching elements 143, so that the antenna structure 100 works in the LTE-A Band 8 frequency band (880-960MHz). The curve S902 is a graph of the total radiation efficiency when the first antenna is switched to one of the second switching elements 143 so that the antenna structure 100 operates in the LTE-A Band5 frequency band (824-894 MHz). The curve S903 is a graph of the total radiation efficiency when the first antenna is switched to one of the second switching elements 143 so that the antenna structure 100 works in the LTE-A Band13 frequency band (746-787 MHz). The curve S904 is a graph of the total radiation efficiency when the first antenna is switched to one of the second switching elements 143 so that the antenna structure 100 works in the LTE-A Band17 frequency band (704-746 MHz).

9 shows that when the second switching unit 141 in the second switching circuit 14 shown in FIG. 6 switches to a different second switching element 143, the antenna structure 100 works in the LTE-A intermediate frequency mode and LTE- A graph of S-parameters (scattering parameters) at high frequency mode. The curve S1001 is the S11 value when the first antenna is switched to the LTE-A Band8 frequency band (880-960 MHz) when the antenna structure 100 works in the LTE-A intermediate frequency mode and the LTE-A high frequency mode. Curve S1002 is the S11 value when the first antenna is switched to the LTE-A Band5 frequency band (824-894 MHz) when the antenna structure 100 works in the LTE-A intermediate frequency mode and the LTE-A high frequency mode. Curve S1003 is the S11 value when the first antenna is switched to the LTE-A Band13 frequency band (746-787 MHz) when the antenna structure 100 works in the LTE-A intermediate frequency mode and the LTE-A high frequency mode. Curve S1004 is the S11 value when the first antenna is switched to the LTE-A Band17 frequency band (704-746 MHz) when the antenna structure 100 works in the LTE-A intermediate frequency mode and the LTE-A high frequency mode.

FIG. 10 shows that when the second switching unit 141 in the second switching circuit 14 shown in FIG. 6 switches to a different second switching element 143, the antenna structure 100 works in the LTE-A intermediate frequency mode and LTE- A graph of total radiation efficiency at high frequency mode. The curve S1101 is the total radiation efficiency curve when the first antenna is switched to the LTE-A Band8 frequency band (880-960MHz) when the antenna structure 100 works in the LTE-A intermediate frequency mode and the LTE-A high frequency mode Figure. Curve S1102 is a graph of the total radiation efficiency of the antenna structure 100 when the first antenna is switched to the LTE-A Band5 frequency band (824-894MHz) when the antenna structure 100 works in the LTE-A intermediate frequency mode and the LTE-A high frequency mode . Curve S1103 is a graph of the total radiation efficiency of the antenna structure 100 when the first antenna is switched to the LTE-A Band13 frequency band (746-787MHz) when the antenna structure 100 works in the LTE-A intermediate frequency mode and the LTE-A high frequency mode . Curve S1104 is a graph of the total radiation efficiency of the antenna structure 100 when the first antenna is switched to the LTE-A Band17 frequency band (704-746MHz) when the antenna structure 100 works in the LTE-A intermediate frequency mode and the LTE-A high frequency mode .

FIG. 11 shows that when the first switching unit 131 in the first switching circuit 13 shown in FIG. 5 switches to a different first switching element 133, the antenna structure 100 works in the LTE-A intermediate frequency mode and LTE- A graph of S-parameters (scattering parameters) at high frequency mode. The curve S1201 is the S11 value of the antenna structure 100 when the second antenna is switched to the LTE-A Band3 frequency band (1710-1880 MHz) when the antenna structure 100 works in the LTE-A intermediate frequency mode and the LTE-A high frequency mode. Curve S1202 is the S11 value when the second antenna is switched to the LTE-A Band1 frequency band (1920-2170 MHz) when the antenna structure 100 works in the LTE-A intermediate frequency mode and the LTE-A high frequency mode. Curve S1203 is the S11 value of the antenna structure 100 when the second antenna is switched to the LTE-A Band41 frequency band (2496-2690MHz) when the antenna structure 100 works in the LTE-A intermediate frequency mode and the LTE-A high frequency mode. Curve S1204 is the S11 value of the antenna structure 100 when the second antenna is switched to the LTE-A Band40 band (2300-2400MHz) when the antenna structure 100 works in the LTE-A intermediate frequency mode and the LTE-A high frequency mode.

FIG. 12 shows that when the first switching unit 131 in the first switching circuit 13 shown in FIG. 5 switches to a different first switching element 133, the antenna structure 100 works in the LTE-A intermediate frequency mode and LTE- A graph of total radiation efficiency at high frequency mode. The curve S1301 is the total radiation efficiency curve when the second antenna is switched to the LTE-A Band3 frequency band (1710-1880MHz) when the antenna structure 100 works in the LTE-A intermediate frequency mode and the LTE-A high frequency mode Figure. Curve S1302 is a graph of the total radiation efficiency of the antenna structure 100 when the second antenna is switched to the LTE-A Band1 frequency band (1920-2170MHz) when the antenna structure 100 works in the LTE-A intermediate frequency mode and the LTE-A high frequency mode . Curve S1303 is a graph of the total radiation efficiency of the antenna structure 100 when the second antenna is switched to the LTE-A Band41 frequency band (2496-2690MHz) when the antenna structure 100 works in the LTE-A intermediate frequency mode and the LTE-A high frequency mode . Curve S1304 is a graph of the total radiation efficiency of the antenna structure 100 when the second antenna is switched to the LTE-A Band40 frequency band (2300-2400MHz) when the antenna structure 100 works in the LTE-A intermediate frequency mode and the LTE-A high frequency mode .

Obviously, as can be seen from FIGS. 7 to 12, when the antenna structure 100 works in the LTE-A Band8 frequency band (880-960MHz), the LTE-A Band5 frequency band (824-894MHz), and the LTE-A Band13 frequency band (746 -787MHz) and LTE-A Band17 frequency band (704-746MHz), neither the LTE-A intermediate frequency band nor the LTE-A high frequency band of the antenna structure 100 is affected. That is, when the second switching circuit 14 switches, the second switching circuit 14 is only used to change the LTE-A low frequency mode of the antenna structure 100 and does not affect its LTE-A intermediate frequency mode and LTE-A High frequency mode.

It can be understood that, in other embodiments, the positions of the first breakpoint 118 and the second breakpoint 119 may also be adjusted according to specific conditions. For example, as shown in FIG. 13, the first break point 118 a is opened at a position of the second side portion 117 near the end portion 115. The second break point 119a is opened at a position of the end portion 115 close to the first side portion 116. The antenna structure 100 of this embodiment is opposite to the antenna structure 100 of the previous embodiment.

In summary, this creation meets the requirements of the invention patent, and the patent application is filed in accordance with the law. However, the above are only the preferred embodiments of this creation, and the scope of this creation is not limited to the above embodiments. For those who are familiar with the skills of this case, the equivalent modifications or changes made by the spirit of this creation are all It should be covered by the following patent applications.

100‧‧‧ Antenna structure 200, 200a‧‧‧ wireless communication device 11‧‧‧Housing 210‧‧‧First ground point 211‧‧‧Second ground point 212‧‧‧Feeding point 215‧‧‧ First electronic component 216‧‧‧Second electronic component 12‧‧‧Feeding Department 13‧‧‧ First switching circuit 131‧‧‧ First switching unit 133‧‧‧ First switching element 14‧‧‧Second switching circuit 141‧‧‧Second switching unit 143‧‧‧Second switching element 15‧‧‧First Grounding Department 16‧‧‧Second Ground 17‧‧‧ Matching circuit 112‧‧‧Border 113‧‧‧Backboard 201‧‧‧Display unit 23‧‧‧ port 114‧‧‧accommodating space 115‧‧‧End 116‧‧‧The first side 117‧‧‧Second side 118, 118a‧‧‧First breakpoint 119, 119a‧‧‧second breakpoint 120‧‧‧Slotted E1‧‧‧First Radiation Department E11‧‧‧The first radiation section E12‧‧‧Second Radiation Section E2‧‧‧Second Radiation Department

FIG. 1 is a schematic diagram of 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 a circuit diagram of the antenna structure shown in FIG. 1. FIG. 4 is a schematic diagram of current flow when the antenna structure shown in FIG. 3 is in operation. FIG. 5 is a circuit diagram of the first switching circuit in the antenna structure shown in FIG. 3. 6 is a circuit diagram of a second switching circuit in the antenna structure shown in FIG. 3. 7 is a graph of S-parameters (scattering parameters) when the antenna structure operates in the low-frequency mode of LTE-A when the second switching unit in the second switching circuit shown in FIG. 6 switches to a different second switching element. FIG. 8 is a graph of the total radiation efficiency of the antenna structure when the antenna structure operates in the low-frequency mode of LTE-A when the second switching unit in the second switching circuit shown in FIG. 6 switches to a different second switching element. 9 is the S parameter (scattering) when the antenna structure works in the LTE-A intermediate frequency mode and the LTE-A high frequency mode when the second switching unit in the second switching circuit shown in FIG. 6 switches to a different second switching element Parameter) curve. 10 is a graph of the total radiation efficiency when the antenna structure works in the LTE-A intermediate frequency mode and the LTE-A high frequency mode when the second switching unit in the second switching circuit shown in FIG. 6 switches to a different second switching element . 11 is the S-parameter (scattering) when the antenna structure works in the LTE-A intermediate frequency mode and the LTE-A high frequency mode when the first switching unit in the first switching circuit shown in FIG. 5 switches to different first switching elements Parameter) curve. 12 is a diagram of the total radiation efficiency when the antenna structure works in the LTE-A intermediate frequency mode and the LTE-A high frequency mode when the first switching unit in the first switching circuit shown in FIG. 5 switches to different first switching elements . 13 is a schematic diagram of an antenna structure applied to a wireless communication device according to another preferred embodiment of the present invention.

100‧‧‧ Antenna structure

210‧‧‧First ground point

211‧‧‧Second ground point

212‧‧‧Feeding point

215‧‧‧ First electronic component

216‧‧‧Second electronic component

12‧‧‧Feeding Department

13‧‧‧ First switching circuit

14‧‧‧Second switching circuit

15‧‧‧First Grounding Department

16‧‧‧Second Ground

17‧‧‧ Matching circuit

113‧‧‧Backboard

118‧‧‧ First breakpoint

119‧‧‧ Second breakpoint

120‧‧‧Slotted

E1‧‧‧First Radiation Department

E11‧‧‧The first radiation section

E12‧‧‧Second Radiation Section

E2‧‧‧Second Radiation Department

Claims (10)

An antenna structure is applied to a wireless communication device. The improvement is that the antenna structure includes a housing, a feed-in portion, a first grounding portion, and a second grounding portion. The housing includes at least a backplane and a frame. The frame is provided. On the periphery of the backplane, a slot is provided on the backplane, a first break point and a second breakpoint are provided on the frame, the slot is opened at the edge of the backplane and is in contact with the frame Set in parallel, one of the first interruption point and the second interruption point is opened at one end of the slot; the slot, the first interruption point, and the second interruption point jointly divide a space from the frame The first radiating portion and the second radiating portion are provided, the frame between the first interruption point and the second interruption point constitutes the first radiating portion, and the second interruption point is far away from the first The radiating portion and the frame on the side of the first interruption point constitute the second radiating portion, the first grounding portion is electrically connected to the second radiating portion, and the second grounding portion is electrically connected to the first A radiation part, the feeding part is electrically connected to the first radiation part; when a current is fed from the feeding part, the current flows through the first radiation part and is coupled to the second radiation part. The antenna structure according to item 1 of the patent application scope, wherein the frame includes at least a terminal portion, a first side portion, and a second side portion, and the first side portion and the second side portion are respectively connected to the terminal At both ends of the portion, the slot is opened inside the end portion and extends toward the direction of the first side portion and the second side portion respectively, and the first break point is opened at the first side portion Near the position of the end portion, the second interruption point is opened at a position of the end portion close to the second side portion. The antenna structure as described in item 2 of the patent application range, wherein the antenna structure includes a matching circuit, one end of the feeding part is connected to the first radiating part, and the other end is electrically connected to the feeding point through the matching circuit , Used to feed current signals to the first radiating part, the frame between the feeding part and the first interruption point constitutes a first radiating section, and between the feeding part and the second interruption point The frame between the two constitutes a second radiating section. When current is fed from the feeding point, the current flows through the matching circuit and the first radiating section in sequence, and flows to the first interruption point, In turn, the first radiation section excites a first mode to generate a radiation signal in the first frequency band. When a current is fed from the feeding point, the current also flows through the matching circuit and the first Two radiation sections, and coupled to the second radiating portion through the second break point, so that the second radiating portion excites a second mode to generate a radiation signal in a second frequency band, the first mode It is an LTE-A low frequency mode, and the second mode includes the LTE-A intermediate frequency mode and the LTE-A high frequency mode. The antenna structure according to item 3 of the patent application scope, wherein the antenna structure further includes a first switching circuit, the first switching circuit includes a first switching unit and a plurality of first switching elements, and the first switching unit Electrically connected to the second radiating portion, the first switching elements are connected in parallel with each other, and one end of the first switching element is electrically connected to the first switching unit, the other end is grounded, and each first switching element has a different impedance. By controlling the switching of the first switching unit, the first switching unit is switched to a different first switching element, thereby adjusting the second frequency band. The antenna structure according to item 3 of the patent application scope, wherein the antenna structure further includes a second switching circuit, the second switching circuit includes a second switching unit and a plurality of second switching elements, and the second switching unit Electrically connected to the first radiating portion, the second switching elements are connected in parallel with each other, and one end thereof is electrically connected to the second switching unit, and the other end is grounded, each second switching element has a different impedance, By controlling the switching of the second switching unit, the second switching unit switches to a different second switching element, thereby adjusting the first frequency band. The antenna structure according to item 4 of the patent application scope, wherein the first ground portion is located between the second break point and the second side portion, and one end of the first ground portion is A switching circuit is grounded, and the other end is electrically connected to the end of the second radiating portion near the second interruption point to provide ground for the second radiating portion. The antenna structure as described in item 5 of the patent application scope, wherein one end of the second grounding portion is electrically connected to the first radiating portion, and the other end is grounded by the second switching circuit, which is the first Radiation provides grounding. A wireless communication device including the antenna structure according to any one of patent applications 1-7. The wireless communication device according to item 8 of the patent application scope, wherein the wireless communication device includes a first electronic component and a second electronic component, and the second grounding portion is located between the first electronic component and the second electronic component Between components, the distance between the second ground portion and the first electronic component is smaller than the distance between the second ground portion and the second electronic component. The wireless communication device according to item 9 of the patent application scope, wherein the frame is further provided with a port, the port is opened at a middle position of an end portion of the frame, and penetrates the end portion, the port and The first electronic component corresponds to such that the first electronic component is exposed from the port portion.

Images