CN110829030A - Antenna assembly and mobile terminal - Google Patents
Antenna assembly and mobile terminal Download PDFInfo
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- CN110829030A CN110829030A CN201810910836.3A CN201810910836A CN110829030A CN 110829030 A CN110829030 A CN 110829030A CN 201810910836 A CN201810910836 A CN 201810910836A CN 110829030 A CN110829030 A CN 110829030A
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- antenna assembly
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- input end
- mobile terminal
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/10—Resonant antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
- H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/44—Details of, or arrangements associated with, antennas using equipment having another main function to serve additionally as an antenna, e.g. means for giving an antenna an aesthetic aspect
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
- H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
- H01Q5/335—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors at the feed, e.g. for impedance matching
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/50—Feeding or matching arrangements for broad-band or multi-band operation
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Telephone Set Structure (AREA)
- Support Of Aerials (AREA)
Abstract
The invention provides an antenna assembly and a mobile terminal, wherein the antenna assembly is used for being electrically connected between a mainboard and a radiator of the mobile terminal, and comprises a flexible circuit board, wherein the flexible circuit board is provided with: the first input end and the second input end are used for receiving an output signal of the mainboard; the first output end is used for electrically connecting the metal shell radiator; a tuning circuit comprising a variable capacitance, the variable capacitance comprising: the rotor plate pin is electrically connected with the first input end; the first stator pin is electrically connected with the second input end; the second stator pin is electrically connected with the first output end; the variable capacitor is used for adjusting capacitance values output by the first stator pin and the second stator pin according to the output signal, so that an impedance value output by the first output end is changed, and the variable capacitor is beneficial to reducing the board distribution pressure of the mainboard and ensuring the consistency of the antenna performance.
Description
Technical Field
The invention relates to the technical field of mobile terminals, in particular to an antenna assembly and a mobile terminal.
Background
This section is intended to provide a background or context to the specific embodiments of the invention that are recited in the claims. The description herein is not admitted to be prior art by inclusion in this section.
A mobile terminal represented by a mobile phone has been widely used in daily life as an electronic communication device. In the related art, an antenna tuning circuit of a mobile terminal is disposed on a main board.
In order to meet the high-quality use requirements of users for music playing, photographing or the like, the mobile terminal often needs to set more related components on the main board, and by consideration of layout positions of the components and limitation of the area of the main board, how to set a tuning circuit of a metal bottom shell antenna belt of the mobile terminal and keep good radiation performance of the antenna is a technical problem to be solved in the industry.
Disclosure of Invention
In view of the above, the present invention provides an antenna assembly with a tuning circuit disposed on a flexible circuit board, and a mobile terminal.
An antenna assembly for being installed in a mobile terminal, the mobile terminal comprising a metal bottom case exposed on a surface of the mobile terminal and a main board disposed inside the mobile terminal, the metal bottom case comprising a first case and a second case disposed at an interval, wherein the first case comprises a radiator for transmitting wireless signals, the antenna assembly being electrically connected between the main board and the radiator, the antenna assembly comprising a flexible circuit board, the flexible circuit board being provided with:
the first input end and the second input end are used for receiving an output signal of the mainboard;
the first output end is used for electrically connecting the radiating body; and
a tuning circuit comprising a variable capacitance, the variable capacitance comprising:
the moving plate pin is electrically connected with the first input end;
the first stator pin is electrically connected with the second input end; and
the second stator pin is electrically connected with the first output end;
the variable capacitor is used for adjusting the capacitance values output by the first stator pin and the second stator pin according to the output signal, so that the impedance value output by the first output end is changed.
Furthermore, the flexible circuit board has a multilayer structure, and the same lines arranged on different layers are communicated through via holes.
Further, the flexible circuit board further comprises a second output end, and the first stator pin is electrically connected with a reference ground on the second shell through the second output end.
Further, the first output end and the second output end are arranged on the bottom layer of the flexible circuit board, and/or the variable capacitor is arranged on the top layer of the flexible circuit board.
Furthermore, the tuning circuit further comprises a capacitor and an inductor, two ends of the capacitor are respectively and electrically connected with the moving plate pin and the first stator pin of the variable capacitor, and two ends of the inductor are respectively and electrically connected with the first output end and the second stator pin of the variable capacitor.
Further, the capacitor and the inductor are both arranged on the top layer of the flexible circuit board.
Furthermore, the first input end and the second input end are both golden fingers and are connected with the mainboard through elastic pieces.
Further, the first output end or the second output end is a nickel sheet, a copper sheet, a gold sheet, an aluminum sheet or a stainless steel sheet.
Further, the first output end or the second output end is used for being fixed on the metal bottom shell through laser welding or ultrasonic welding.
A mobile terminal including an antenna assembly as claimed in any preceding claim, the mobile terminal comprising:
a metal bottom case comprising:
a top case including a radiator for transmitting a wireless signal; and
a gap is arranged between the top shell and the middle shell; and
a main board located inside the top housing, including a radio frequency circuit for emitting the output signal;
the antenna assembly is clamped between the radiator and the mainboard, the first output end is used for electrically connecting the radiator, and the first input end and the second input end are respectively electrically connected with the radio frequency circuit.
Further, the radio frequency circuit adjusts the voltage value of the output signal according to the requirement of the working frequency band, so as to adjust the impedance value output by the tuning circuit and the resonant frequency of the antenna assembly and the radiator.
A mobile terminal comprising an antenna assembly as described above, the mobile terminal comprising:
a metal bottom case comprising:
a top case including a radiator for transmitting a wireless signal; and
a middle housing provided with a reference ground, a gap being provided between the top housing and the middle housing; and
a main board located inside the top housing, including a radio frequency circuit for emitting the output signal;
the antenna assembly is clamped between the radiator and the mainboard, the first output end is used for electrically connecting the radiator, the second output end is used for electrically connecting the reference ground, and the first input end and the second input end are respectively electrically connected with the radio frequency circuit.
The antenna assembly provided by the invention comprises the variable capacitor arranged on the flexible circuit board, so that the space for arranging other components is increased on the mainboard, and the board arrangement pressure of the mainboard is favorably reduced. In addition, the variable capacitor is used for adjusting the output impedance of the antenna assembly, so that the resonant frequency of the antenna assembly is adjusted, the antenna of the mobile terminal can work in the optimal receiving and transmitting state, and the consistency of the antenna performance can be ensured.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments/modes of the present invention, the drawings needed to be used in the description of the embodiments/modes are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments/modes of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a perspective view of a mobile terminal in the present invention.
Fig. 2 is an exploded view of the mobile terminal shown in fig. 1.
Fig. 3 is a schematic top-layer structure diagram of an antenna assembly according to an embodiment of the present invention.
Fig. 4 is a schematic bottom-level structure diagram of an antenna assembly according to an embodiment of the present invention.
Fig. 5 is an assembly structure diagram of the antenna assembly shown in fig. 2.
Description of the main elements
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a detailed description of the present invention will be given below with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth to provide a thorough understanding of the present invention, and the described embodiments are merely a subset of the embodiments of the present invention, rather than a complete embodiment. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
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.
Referring to fig. 1, fig. 1 is a perspective view of a mobile terminal 10 according to the present invention. The mobile terminal 10 according to the embodiment of the present invention includes an antenna module for wireless communication, for example: tablet computers, mobile phones, electronic readers, Personal Computers (PCs), notebook computers, in-vehicle devices, network televisions, wearable devices, and the like. However, the following embodiments are not limited to the mobile phone, and may be other mobile terminals as described above.
The mobile terminal 10 has a display surface 101 and a back surface 901 located opposite to the display surface 101. The mobile terminal 10 is provided with a rectangular front cover 100 on the display surface 101 side, and the front cover 100 includes a substantially rectangular display area 103 and a non-display area 104 located at the periphery of the display area 103. The display area 103 is an area where the mobile terminal 10 displays images, and the wiring area of the touch display module 200 (fig. 2) is included in the mobile terminal 10 corresponding to the non-display area 104. Further, the non-display area 104 is further provided with a key module 300, and the key module 300 is configured to receive a pressing operation of a user and output a corresponding logic signal. In this embodiment, the key module 300 includes the fingerprint identification device 301, and the fingerprint identification device 301 is used for identifying whether the fingerprint information is consistent with the stored fingerprint information, and the fingerprint identification device 301 is a capacitive fingerprint sensor and is disposed in the opening of the front cover 100 (fig. 2) of the mobile terminal 10.
Referring to fig. 2 in conjunction with fig. 1, fig. 2 is an exploded schematic view of the mobile terminal 10 shown in fig. 1. The mobile terminal 10 includes a front cover (cover lens)100, a touch display module 200, a bezel 400, a main board 500, an antenna assembly 700, and a bottom metal case 900. The front cover 100 is disposed on the display surface 101 side and covers the surface of the mobile terminal 10. The touch display module 200 is disposed adjacent to the front cover 100 and configured to emit image light and acquire coordinate information of a touch point. The frame 400 is used to fix the touch display module 200 and the main board 500. The main board 500 is a data processing center of the mobile terminal 10 and carries several electronic devices. The metal bottom case 900 is disposed away from the front cover 100 and covers a surface of the mobile terminal 10. The antenna assembly 700 is provided with a tuning circuit and is sandwiched between the motherboard 500 and the metal bottom case 900. The front cover 100, the touch display module 200, the main board 500, the antenna assembly 700, and the metal bottom case 900 are sequentially disposed from top to bottom, the frame 400 is disposed around the touch display module 200 and the main board 500, and the touch display module 200, the main board 500, and the antenna assembly 700 are accommodated in an accommodating space defined by the front cover 100, the metal bottom case 900, and the frame 400.
The bottom metal shell 900 includes a top shell 910, a middle shell 930, and a bottom shell 950. A gap 920 is disposed between the top case 910 and the middle case 930, a gap 940 is disposed between the middle case 930 and the bottom case 950, and the gap 920 and the gap 940 are filled with a non-metallic material, so that a wireless communication signal inside the mobile terminal 10 can pass through the gap 920 and the gap 940 to radiate to the outside of the metal case radiator 900. Wherein the middle housing 930 is provided with a reference ground, i.e. the reference ground on the middle housing 930 is electrically connected with the reference ground on the main board 500.
The mobile terminal 10 further includes an antenna module including radio frequency circuitry, an antenna assembly 700, and a radiator. The rf circuit including the rf chip is disposed in the predetermined region P of the main board 500 (fig. 5). It is understood that the location of the rf circuit can be flexibly set according to the requirement, and is not limited thereto.
In the embodiment of the present invention, the radiator is the top case 910, that is, the top case 910 serves as a radiator of the antenna module to transmit wireless signals. In modified embodiments, the top case 910 includes a radiator of the antenna module, and the radiator may be disposed inside the top case 910, or the top case 910 includes a metal portion and a non-metal portion, and the metal portion includes the radiator.
The antenna assembly 700 is electrically connected to the motherboard 500 and the top case 900 (i.e., the radiator), respectively, and an output signal of the motherboard 500 is radiated to the outside of the mobile terminal 10 through the antenna assembly 700 and the top case 900.
Under a severe communication environment, the radio frequency circuit can automatically adjust a working frequency band, and specifically, the radio frequency circuit sends an output signal for transmission to the antenna assembly 700 and the metal bottom case 900 according to the requirement of the working frequency band, such as 2G/3G/4G/wifi, so as to control the antenna assembly 700 to output a corresponding impedance value, and further adjust the resonant frequency of the antenna assembly 700 and the metal bottom case 900, so that the antenna module of the mobile terminal 10 achieves an optimal transceiving effect.
In one embodiment, the rf circuit includes an rf chip having a plurality of receiving terminals, the rf circuit further includes a plurality of multiplexers of a first type and a multiplexer of a second type, each multiplexer of the first type includes a receiving pin and a transmitting pin, and the multiplexer of the second type includes a plurality of receiving pins and a plurality of transmitting pins; each receiving end of the radio frequency chip is selectively coupled to a receiving pin of a first type of multiplexer or a receiving pin of a second type of multiplexer; when the receiving end of the radio frequency chip is coupled to the receiving pin of the multiplexer of the first type, the radio frequency circuit works in a first communication mode; when the receiving end of the radio frequency chip is coupled to the receiving pin of the multiplexer of the second type, the radio frequency circuit works in a second communication mode. It is understood that in other embodiments, the rf circuit may take other forms, and is not limited thereto.
Referring to fig. 3-4, fig. 3 is a top-layer structural diagram of an antenna assembly 700 according to an embodiment of the invention, and fig. 4 is a bottom-layer structural diagram of the antenna assembly 700 according to the embodiment of the invention. The antenna assembly 700 is electrically connected between the main board 500 and the metal bottom case 900 of the mobile terminal 10, the antenna assembly 700 includes a flexible circuit board 710(FPC), and the flexible circuit board 710 is provided with: a first input 721, a second input 722, a tuning circuit 730, a first output 771 and a second output 772.
In the embodiment of the present invention, the flexible circuit board 710 has a multi-layer structure, and the same lines disposed on different layers are connected through at least one via 750. Specifically, in one embodiment, the flexible circuit board 710 includes a top layer 711, a bottom layer 713, and an insulating connection layer sandwiched between the top layer 711 and the bottom layer 713. The via hole 750 is machined by a numerical control machine, and copper is plated on the wall of the via hole 750, so that the same lines on the top layer 711 and the bottom layer 713 are conducted through copper plating. The two sides are provided with the flexible circuit boards, the length of the flexible circuit boards (namely FPC antennas) can be increased in a smaller area through a communication mode from the top layer to the bottom layer, and the antennas are prevented from occupying other spaces in the mobile terminal.
Further, the top layer 711 and the bottom layer 713 are used to house electronics and associated circuitry that is part of an antenna for transmitting or receiving wireless communication signals. The connecting layer comprises an adhesive and a film plate. The top layer 711 and the bottom layer 713 are securely and securely assembled together by placing the film sheet between the top layer 711 and the bottom layer 713 and adhering with the adhesive. Meanwhile, the structural arrangement increases the overall thickness and strength of the top layer 711 and the bottom layer 713, reduces the breakage rate of the antenna assembly 700, and reduces the size of the antenna assembly 700 while ensuring the use performance of the antenna assembly 700, thereby reducing the impedance value, ensuring the use stability of the antenna assembly 700, and improving the performance of the product.
Further, the first input end 721 and the second input end 722 are used for receiving an output signal from the rf circuit on the main board 500. In the embodiment of the invention, the first input end 721 and the second input end 722 are both gold fingers, wherein the first input end 721 is disposed on the top layer 711 and the second input end 722 is disposed on the bottom layer 713. It is understood that in other embodiments, the positions of the first input end 721 and the second input end 722 on the flexible circuit board 710 can be flexibly set according to the requirement, for example, the second input end 722 is disposed on the top layer 711, the first input end 721 is disposed on the bottom layer 713, or both the first input end 721 and the second input end 722 are disposed on the top layer 711 or the bottom layer 713. In one embodiment, the flexible circuit board 710 includes a single layer structure for routing, with the electronics and associated circuitry disposed in one layer. In one embodiment, the flexible circuit board 710 includes more than two layers of layer structures for routing, and the same lines of different layers are connected by at least one via 750.
Referring further to fig. 5 in conjunction with fig. 3-4, fig. 5 is an assembly structure diagram of the antenna assembly 700 shown in fig. 2. The first input end 721 and the second input end 722 are connected to the main board 500 through the elastic sheet 510. In one embodiment, the first input end 721 and the second input end 722 are connected to the main board 500 through other connectors. It is understood that the electrical connection between the first input end 721 and the second input end 722 and the main board 500 can be realized by other means known in the art.
The first output port 771 and the second output port 772 are disposed on the bottom layer 713 of the flexible circuit board 710. The antenna assembly 700 is sandwiched between the metal bottom case 900 and the motherboard 500. When assembled, the top layer 711 is intended to be mounted towards the motherboard 500 and the bottom layer 713 is intended to be mounted towards the metal bottom shell 900. Specifically, the first output port 771 and the second output port 772 are electrically connected to the bottom metal casing 900. The top housing 910 is provided with a metal surface 911 inside, and the middle housing 930 is provided with a metal surface 931 inside, wherein the metal surface 931 is used for transmitting electrical signals with reference to the ground. The first output port 771 is used for electrically connecting to the metal surface 911, and the second output port 772 is used for electrically connecting to the second metal surface 931. It is understood that the positions of the first output port 771 and the second output port 772 on the flexible circuit board 710 can be flexibly set according to the requirement. The first output port 771 and/or the second output port 772 are metal sheets such as nickel sheets, copper sheets, gold sheets, aluminum sheets or stainless steel sheets, and are fixed to the first metal surface 911 and the second metal surface 931 by laser welding or ultrasonic welding, respectively. In one embodiment, the first output end 771 and the second output end 772 are respectively pressed on the first metal surface 911 and the second metal surface 931 by a special fixture, and the antenna assembly 700 and the metal bottom case 900 are integrated by welding with a laser welding machine in a fully attached state. The above-mentioned fixing manner makes the connection between the first output end 771 and the second output end 772 and the metal bottom case 900 more stable, which is beneficial to reducing the impedance value between the antenna assembly 700 and the metal bottom case 900, and improving the stability of the connection between the antenna assembly 700 and the metal bottom case 900 and the reliability of the antenna module.
Referring to fig. 3 again, the tuning circuit includes a variable capacitor U1, which includes a moving plate pin a1, a first stator pin B1, and a second stator pin B2. The moving plate pin a1 is electrically connected to the first input end 721; the first stator pin B1 is electrically connected to the second input 722 and the second output 772; the second stator pin B2 is electrically connected to the first output 771. The variable capacitor U1 is used to adjust the capacitance values output by the first stator pin B1 and the second stator pin B2 according to the output signal, so as to adjust the impedance value output by the first output port 771 and the resonant frequency of the antenna assembly 700 and the top housing 910, so that the antenna module achieves the best transceiving effect, and the consistency of the antenna performance is ensured.
In this embodiment, the tuning circuit further includes an inductor L1 and a capacitor C2, two ends of the inductor L1 are electrically connected to the first output port 771 and the second stator pin B2 of the variable capacitor U1, respectively, and two ends of the capacitor C2 are electrically connected to the rotor pin a1 and the first stator pin B1 of the variable capacitor U1, respectively. The inductor L1 is used to suppress a sudden change in current on a line between the first output end 771 and the second stator pin B2, the capacitor C2 is used to suppress a sudden change in voltage between the rotor pin a1 and the first stator pin B1, and the inductor L1 and the capacitor C2 are used to filter out an influence on the variable capacitor U1 caused by fluctuations in operating voltage and current of other components, which is beneficial to improving the operating stability and the service life of the variable capacitor U1.
In the embodiment of the invention, the variable capacitor U1, the inductor L1 and the capacitor C2 are all disposed on the top layer 711. It is understood that in other embodiments, the positions of the variable capacitor U1, the inductor L1, and the capacitor C2 on the flexible circuit board 710 may be flexibly set, for example, at least part of the electronic devices may be disposed on the bottom layer 713.
In the embodiment of the present invention, the top case 910 (the radiator) is electrically connected to the board through the antenna assembly 700. Specifically, the radio frequency circuit is electrically connected to the top case 910 through the first input end 721, the second input end 722, the capacitor C2, the variable capacitor U1, the inductor L1 and the first output end 771; the first input end 721 is electrically connected to the second input end 722 through a capacitor C2 and a variable capacitor U1; the top housing 910 is electrically connected to the ground reference of the middle housing 930 through the first output 771, the inductor L1, the variable capacitor U1, the capacitor C2 and the second output 772. That is, the first input end 721 is electrically connected to the second input end 722, the top case 910 is electrically connected to the middle case 930, the rf circuit on the motherboard 500 is electrically connected to the top case 910 through the first input end 721 and the second input end 722, and the top case 910 and the antenna module 700 are part of the antenna module and have the same radiation frequency.
It should be noted that, within the scope of the spirit or the basic features of the present invention, the embodiments applicable to the different embodiments may also be applied to each other for the sake of brevity and avoiding repetition, and thus, the details are not described herein again.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned. Furthermore, it is obvious that the word "comprising" does not exclude other elements or steps, and the singular does not exclude the plural. Several of the means recited in the apparatus claims may also be embodied by one and the same means or system in software or hardware. The terms first, second, etc. are used to denote names, but not any particular order.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (12)
1. An antenna assembly for being installed in a mobile terminal, the mobile terminal comprising a metal bottom case exposed on a surface of the mobile terminal and a main board disposed inside the mobile terminal, the metal bottom case comprising a first case and a second case disposed at an interval, wherein the first case comprises a radiator for transmitting wireless signals, the antenna assembly being electrically connected between the main board and the radiator, the antenna assembly comprising a flexible circuit board, wherein the flexible circuit board is provided with:
the first input end and the second input end are used for receiving an output signal of the mainboard;
the first output end is used for electrically connecting the radiating body; and
a tuning circuit comprising a variable capacitance, the variable capacitance comprising:
the moving plate pin is electrically connected with the first input end;
the first stator pin is electrically connected with the second input end; and
the second stator pin is electrically connected with the first output end;
the variable capacitor is used for adjusting the capacitance values output by the first stator pin and the second stator pin according to the output signal, so that the impedance value output by the first output end is changed.
2. The antenna assembly of claim 1, wherein the flexible circuit board has a multilayer structure, and identical lines disposed at different layers are communicated through vias.
3. The antenna assembly of claim 2, wherein the flexible circuit board further includes a second output terminal through which the first stator pin is electrically connected to a reference ground on the second housing.
4. The antenna assembly of claim 3, wherein the first output terminal and the second output terminal are disposed on a bottom layer of the flexible circuit board, and/or the variable capacitor is disposed on a top layer of the flexible circuit board.
5. The antenna assembly of claim 2, wherein the tuning circuit further comprises a capacitor and an inductor, wherein two ends of the capacitor are electrically connected to the moving plate pin and the first stator pin of the variable capacitor, respectively, and two ends of the inductor are electrically connected to the first output terminal and the second stator pin of the variable capacitor, respectively.
6. The antenna assembly of claim 5, wherein the capacitor and the inductor are both disposed on a top layer of the flexible circuit board.
7. The antenna assembly of claim 1, wherein the first input end and the second input end are both gold fingers and are connected to the motherboard by a spring sheet.
8. The antenna assembly of claim 3, wherein the first output or the second output is a sheet of nickel, copper, gold, aluminum, or stainless steel.
9. The antenna assembly according to any one of claims 3, 4 and 8, characterized in that the first output end or the second output end is intended to be fixed to the metal bottom case by laser welding or ultrasonic welding.
10. A mobile terminal comprising the antenna assembly of any one of claims 1-9, the mobile terminal comprising:
a metal bottom case comprising:
a top case including a radiator for transmitting a wireless signal; and
a gap is arranged between the top shell and the middle shell; and
a main board located inside the top housing, including a radio frequency circuit for emitting the output signal;
the antenna assembly is clamped between the radiator and the mainboard, the first output end is used for electrically connecting the radiator, and the first input end and the second input end are respectively electrically connected with the radio frequency circuit.
11. The mobile terminal of claim 10, wherein the rf circuit adjusts the voltage level of the output signal according to the requirement of the operating frequency band, thereby adjusting the impedance level output by the tuning circuit and the resonant frequency of the antenna assembly and the radiator.
12. A mobile terminal comprising an antenna assembly according to any one of claims 3, 4, 8, the mobile terminal comprising:
a metal bottom case comprising:
a top case including a radiator for transmitting a wireless signal; and
a middle housing provided with a reference ground, a gap being provided between the top housing and the middle housing; and
a main board located inside the top housing, including a radio frequency circuit for emitting the output signal;
the antenna assembly is clamped between the radiator and the mainboard, the first output end is used for electrically connecting the radiator, the second output end is used for electrically connecting the reference ground, and the first input end and the second input end are respectively electrically connected with the radio frequency circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810910836.3A CN110829030A (en) | 2018-08-10 | 2018-08-10 | Antenna assembly and mobile terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810910836.3A CN110829030A (en) | 2018-08-10 | 2018-08-10 | Antenna assembly and mobile terminal |
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|---|---|
| CN110829030A true CN110829030A (en) | 2020-02-21 |
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| CN201810910836.3A Pending CN110829030A (en) | 2018-08-10 | 2018-08-10 | Antenna assembly and mobile terminal |
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| CN (1) | CN110829030A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023000733A1 (en) * | 2021-07-23 | 2023-01-26 | Oppo广东移动通信有限公司 | Grounding structure of antenna device, antenna device, and electronic apparatus |
Citations (7)
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