CN107293849B - NFC antenna structure and mobile terminal - Google Patents
NFC antenna structure and mobile terminal Download PDFInfo
- Publication number
- CN107293849B CN107293849B CN201610200632.1A CN201610200632A CN107293849B CN 107293849 B CN107293849 B CN 107293849B CN 201610200632 A CN201610200632 A CN 201610200632A CN 107293849 B CN107293849 B CN 107293849B
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- 239000002184 metal Substances 0.000 claims abstract description 61
- 229910052755 nonmetal Inorganic materials 0.000 claims abstract description 13
- 229910000859 α-Fe Inorganic materials 0.000 claims description 10
- 230000001154 acute effect Effects 0.000 claims description 4
- 230000035699 permeability Effects 0.000 claims description 2
- 230000005855 radiation Effects 0.000 abstract description 62
- 230000008878 coupling Effects 0.000 description 5
- 238000010168 coupling process Methods 0.000 description 5
- 238000005859 coupling reaction Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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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
- H01Q1/243—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 with built-in antennas
- H01Q1/244—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 with built-in antennas extendable from a housing along a given path
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q23/00—Antennas with active circuits or circuit elements integrated within them or attached to them
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Support Of Aerials (AREA)
Abstract
The embodiment of the invention discloses an NFC antenna structure, which comprises: nonmetal protecgulum, metal center, display screen, metal back of the body lid and NFC antenna, the metal center includes a top frame, a underframe and two side frames, the display screen includes a topside, a base and two sides, the NFC antenna includes first radiating part and second radiating part, first radiating part is located the below of display screen, the second radiating part is located the metal back of the body lid the top frame of metal center the topside of display screen with in the cavity that nonmetal protecgulum formed, the NFC antenna is close to the top frame of metal center. The embodiment of the invention also discloses a mobile terminal. By adopting the invention, the radiation performance of the NFC antenna can be improved.
Description
Technical Field
The invention relates to the field of antennas, in particular to an NFC antenna structure and a mobile terminal.
Background
NFC is a short-range, high-frequency wireless communication technology that allows contactless point-to-point data transmission between electronic devices.
Along with the requirement of the user to the mobile terminal outward appearance constantly improves, more and more metal outward appearance's mobile terminal appears on the market, leads to the inside electromagnetic environment of mobile terminal further to worsen like this, in order to avoid too much metallic material to the shielding of the electromagnetic energy of NFC antenna radiation, the NFC antenna structure that current mobile terminal adopted is: the NFC antenna is arranged on the metal back cover, and a gap is formed in the metal back cover, so that the NFC antenna can communicate with an external reader-writer through the gap.
The problems with the current NFC antenna structures are: due to the size limitation of the gap formed in the metal back cover, the NFC antenna needs to increase the area of the coil of the NFC antenna in order to achieve a predetermined transmitting power, which causes a shortage of space usage of the mobile terminal, and the gap formed in the metal back cover may reduce the structural strength of the mobile terminal.
Disclosure of Invention
The technical problem to be solved by the embodiments of the present invention is to provide an NFC antenna structure and a mobile terminal. Can solve the problem of poor radiation performance of the antenna in the prior art
In order to solve the above technical problem, an embodiment of the present invention provides an NFC antenna structure, including:
the NFC antenna comprises a first radiation part and a second radiation part, the first radiation part is located below the display screen, the second radiation part is located in the metal back cover, the top frame of the metal middle frame, the top edge of the display screen and a cavity formed by the nonmetal front cover plate, and the NFC antenna is close to the metal middle frame.
Wherein, the acute included angle of first radiation portion with the second radiation portion is 0 degree to 30 degrees.
Wherein, still include:
the NFC antenna comprises an NFC antenna coil, a ferrite, a flexible circuit board, a first feed portion and a second feed portion, wherein the first feed portion is connected with the NFC control chip through the first antenna matching circuit and the first low-pass filter, and the second feed portion is connected with the NFC control chip through the second antenna matching circuit and the second low-pass filter.
The first antenna matching circuit and the second antenna matching circuit are symmetrical to each other, and the first low-pass filter and the second low-pass filter are symmetrical to each other.
Wherein the thickness of the ferrite is 0.08mm-0.12mm, the magnetic conductivity is more than 140, and the magnetic resistance is less than 5.
The NFC antenna coil is rectangular, the minimum value of the wiring width is 0.5mm, the minimum value of the wiring distance is 0.2mm, the minimum value of the length of the NFC antenna coil is 20mm, the minimum value of the width is 10mm, and the minimum value of the thickness is 0.05 mm.
The metal middle frame is a closed metal middle frame without break points.
Wherein, a plurality of radiation gaps are arranged on the metal back cover.
And the distance between the NFC antenna coil and the top frame of the metal middle frame is 0.3mm-1 mm.
Correspondingly, the embodiment of the invention also provides a mobile terminal which comprises any one of the NFC antenna structures
The embodiment of the invention has the following beneficial effects:
the coupling area has been increased under the interact of NFC antenna and metal center, need not increase the area of NFC antenna coil, improves the radiation performance of NFC antenna, and the regional homoenergetic of distance is predetermine in the display screen top to outside reader writer simultaneously communicates with the NFC antenna, and the user can use the NFC function in the display screen top, accords with user's use custom, and convenience of customers uses.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1a is a schematic structural diagram of an NFC antenna structure according to an embodiment of the present invention;
fig. 1b is a schematic structural diagram of an antenna coil of the NFC antenna of fig. 1 a;
fig. 1c is a schematic structural diagram of the NFC antenna in fig. 1 a;
fig. 1d is a schematic diagram of the structure of the circuit part of the NFC antenna of fig. 1 a.
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.
Referring to fig. 1a, in an embodiment of the present invention, the NFC antenna structure includes a non-metal front cover plate (not shown), a metal middle frame 10, a display screen 11, a metal back cover (not shown), and an NFC antenna 12, where the metal middle frame 10 may be a closed middle frame without a break point, the metal middle frame 10 includes a top frame 101, a first side frame 102, a bottom frame 103, and a second side frame 104, two ends of the top frame 101 are respectively connected to the first side frame 102 and the second side frame 104, and two ends of the bottom frame 103 are respectively connected to the first side frame 103 and the second side frame 104; the display screen 11 includes a top side 111, a first side 112, a bottom side 113, and a second side 114, and the display screen 11 may be an OLED display screen; the non-metal front cover plate, the metal middle frame 10 and the metal back cover are assembled together to form a cavity, the NFC antenna includes a first radiation portion and a second radiation portion, the first radiation portion and the second radiation portion are electrically connected, and the first radiation portion and the second radiation portion are used for coupling electromagnetic signals, for example: dividing an NFC antenna coil of an NFC antenna into a first radiating part and a second radiating part; the first radiation part is positioned in a cavity formed by the non-metal cover plate, the metal middle frame 10 and the metal back cover, and the second radiation part is positioned below the display screen 11. The non-metal cover plate is attached above the display screen 11, the non-metal cover plate can be made of transparent plastic, a non-metal front cover plate, the display screen 11, a second radiation part of the NFC antenna, a PCB main board, a metal plate and a metal back cover are sequentially arranged in the cavity from top to bottom, two side edges of the metal plate are fixedly connected with two side frames (a first side frame 102 and a second side frame 104) of the metal middle frame 10 and are perpendicular to the two side frames, the metal plate plays a supporting role, the PCB main board is positioned on the metal plate, the display screen 11 is positioned on the PCB main board, the length of the display screen 11 is smaller than that of the top edge of the metal middle frame 10, a window is formed by a top frame 101 of the metal middle frame 10 and is formed by the top edge of the window, a cavity is formed by the non-metal front cover plate above and the metal back cover below the window, a first radiation part of the NFC antenna 12 is positioned in the cavity, and the first radiation part of the NFC antenna, that is, the first radiating portion of the NFC antenna 12 is spaced apart from the first side frame 102 of the metal center frame 10 by a very small distance, but is not electrically connected.
When the NFC antenna 12 needs to communicate with an external reader/writer, the reader/writer is close to the top of the display screen 11 of the mobile terminal, the NFC antenna 12 radiates electromagnetic signals by using the first radiation portion and the metal middle frame, because the second radiation portion is located below the display screen 11, the electromagnetic coupling effect of the second radiation portion is very weak, the coupling area is increased under the interaction between the first radiation portion and the metal middle frame, the area of an NFC antenna coil does not need to be increased, so that the reader/writer can communicate with the NFC antenna in an area with a preset distance above the display screen 11, and meanwhile, a user can use an NFC function above the display screen 11, which is in line with the habit of the user, and is convenient for the user to use.
Optionally, in a possible embodiment of the present invention, an acute included angle between the first radiation portion and the second radiation portion is 0 to 30 degrees.
Specifically, referring to fig. 1b and 1c, an NFC antenna coil of the NFC antenna 12 is divided into a first radiation portion 123 and a second radiation portion 124, a portion above an imaginary line of the NFC antenna coil is the first radiation portion 123, a portion below the imaginary line is the second radiation portion 124, the first radiation portion 123 and the second radiation portion 124 are attached and encapsulated in a flexible circuit board, the flexible circuit board is attached in a ferrite 125, the shape of the ferrite 125 is matched with the shapes of the first radiation portion 123 and the second radiation portion 124, the second radiation portion 124 is located below the display screen 11, the first radiation portion 123 is located in a cavity formed by a non-metal front cover plate, a metal middle frame and a metal back cover, and an acute included angle between the first radiation portion 123 and the second radiation portion 124 is 0 degree to 30 degrees. When the first radiation part 123 and the second radiation part 124 are located on the same plane, the included angle between the two parts is 0 degree; when the first radiation part 123 and the second radiation part 124 are not located on the same plane, the first radiation part 123 is inclined upwards, and the placing mode enables the transmission direction of the electromagnetic signal of the first radiation part to be approximately perpendicular to the external reading and writing, so that the electromagnetic radiation performance is improved.
Optionally, in a possible implementation manner of the present invention, the NFC antenna structure further includes:
the NFC antenna comprises an NFC antenna coil, a ferrite, a flexible circuit board, a first feed portion and a second feed portion, wherein the first feed portion is connected with the NFC control chip through the first antenna matching circuit and the first low-pass filter, and the second feed portion is connected with the NFC control chip through the second antenna matching circuit and the second low-pass filter.
Specifically, referring to fig. 1d, a metal plate is disposed in the metal middle frame 10, two side edges of the metal plate are respectively and fixedly connected to two side frames (a first side frame 102 and a second side frame 104) of the metal middle frame 10, the metal plate is disposed on the metal plate and can be fixed by screws, the metal plate plays a role of supporting a PCB motherboard, the first antenna matching circuit 13, the second antenna matching circuit 15, the first low pass filter 14 and the second low pass filter 16 are located on the PCB motherboard, the NFC antenna coil of the NFC antenna 12, the flexible circuit board and the ferrite 123 may not be located on the PCB motherboard, and the NFC antenna coil is divided into a first radiation portion 123 and a second radiation portion 124, for example: a support part on which the NFC antenna coil, the flexible circuit board, and the ferrite 123 are located is separately provided on the metal bezel 10. The first antenna matching circuit 13 and the second antenna matching circuit 15 are configured to tune an operating frequency band of the NFC antenna coil, so that the operating frequency band of the NFC antenna coil is tuned to a required specified operating frequency band, for example: the frequency point of the NFC antenna coil is an operating frequency band of 13.56MHz, and the first low-pass filter 14 and the first low-pass filter 16 are used for filtering high-frequency noise in the electromagnetic signal. The end of the NFC antenna coil is provided with a first feeding portion 121 and a second feeding portion 122 for feeding electromagnetic signals, the first feeding portion 121 is connected to one data port of the NFC control chip 17 through the first antenna matching circuit 13 and the first low-pass filter 14, and the second feeding portion 122 is connected to the other data port of the NFC control chip 17 through the second antenna matching circuit 15 and the second low-pass filter circuit 16.
Optionally, in a possible implementation manner of the present invention, the first antenna matching circuit and the second antenna matching circuit are symmetrical to each other, and the first low-pass filter and the second low-pass filter are symmetrical to each other.
Specifically, the components, the connection relationships between the components, and the performance parameters of the components included in the first antenna matching circuit 13 and the second antenna matching circuit 15 are the same, and the components, the connection relationships between the components, and the performance parameters of the components included in the first low-pass filter 14 and the second low-pass filter circuit 16 are the same.
Optionally, in a possible embodiment of the present invention, the ferrite has a thickness of 0.08mm to 0.12mm, a magnetic permeability of more than 140, and a magnetic resistance of less than 5.
Optionally, in a possible implementation manner of the present invention, the NFC antenna coil is rectangular, a minimum value of a trace width is 0.5mm, a minimum value of a trace pitch is 0.2mm, a minimum value of a length of the NFC antenna coil is 20mm, a minimum value of a width is 10mm, and a minimum value of a thickness is 0.05 mm.
Specifically, referring to the schematic structural diagram of the NFC antenna coil shown in fig. 1b, the NFC antenna coil is divided into a first radiation portion 123 and a second radiation portion 124, the NFC antenna coil is rectangular, and the NFC antenna coil is an equidistant loop-shaped trace, that is, the distance between two adjacent traces in the first radiation portion 123 and the second radiation portion 124 is a fixed value, the width of the trace is a fixed value, and two ends of the NFC antenna coil are provided with two feeding portions (a first feeding portion 121 and a second feeding portion 122). The minimum value of the length of NFC antenna coil is 20mm, and the minimum value of width is 10mm, and the minimum value of thickness is 0.05mm, and the minimum value of walking the line width of NFC antenna coil is 0.5mm, walks the minimum value of line interval and is 0.2 mm.
It should be noted that the NFC antenna coil is divided into the first radiation portion 123 and the second radiation portion 124, and the present invention is not limited thereto, for example, the NFC antenna coil is equally divided into two radiation portions, or the NFC antenna coil is divided into two radiation portions according to a preset rule
Optionally, in a possible embodiment of the present invention, the metal middle frame is a closed metal middle frame without a break point.
Specifically, the top frame 101, the first side frame 102, the bottom frame 103 and the second side frame 104 which form the metal middle frame 10 form a closed frame shape, and no break point exists on any one frame, so that the structural strength of the metal middle frame can be ensured; wherein, the connecting portion between two adjacent frames can adopt the arc to connect, and the angle of arc can be 45 degrees.
Optionally, the metal back cover is provided with a plurality of radiation slits.
Specifically, the metal back cover is provided with two parallel radiation gaps, the metal back cover is divided into three sections, and the radiation gaps are used for radiating electromagnetic signals of the voice antenna, so that the radiation performance of the voice antenna is enhanced.
Optionally, the distance between the NFC antenna coil and the top frame of the metal middle frame is 0.3mm to 1 mm.
Specifically, the NFC antenna coil is close to the top frame 101 of the metal middle frame 10, the distance between the NFC antenna coil and the top frame 101 of the metal middle frame 10 is 0.3mm-1mm, so that the NFC antenna coil can interact with the metal middle frame 10, the metal middle frame participates in the radiation of electromagnetic signals as a part of the NFC antenna coil, a coupling area is formed above the display screen, the coupling area of the NFC antenna coil can be increased, and the radiation performance is improved.
Embodiments of the present invention further provide a mobile terminal, including the NFC antenna structure described in the foregoing embodiments, and it should be understood that the mobile terminal includes but is not limited to a carrier
Or other operating system, such as a mobile phone. Or other mobile terminalsSuch as a laptop or tablet computer or desktop computer with a touch-sensitive surface (e.g., a touch screen display and/or a touch pad).
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. An NFC antenna structure, comprising:
nonmetal protecgulum, metal center, display screen, metal back of the body lid and near field communication NFC antenna, the metal center includes a top frame, a underframe and two side frames, the display screen includes a topside, a base and two sides, the NFC antenna includes first radiating part and second radiating part, first radiating part is located the below of display screen, the second radiating part is located the metal back of the body lid the top frame of metal center the topside of display screen with in the cavity that the nonmetal protecgulum formed, the NFC antenna is close to the metal center.
2. The antenna structure according to claim 1, wherein the acute included angle of the first radiating portion and the second radiating portion is 0 to 30 degrees.
3. The antenna structure of claim 1, further comprising:
the NFC antenna comprises an NFC antenna coil, a ferrite, a flexible circuit board, a first feed portion and a second feed portion, wherein the first feed portion is connected with the NFC control chip through the first antenna matching circuit and the first low-pass filter, and the second feed portion is connected with the NFC control chip through the second antenna matching circuit and the second low-pass filter.
4. The antenna structure of claim 3, wherein the first antenna matching circuit and the second antenna matching circuit are symmetric to each other, and the first low pass filter and the second low pass filter are symmetric to each other.
5. The antenna structure of claim 3, wherein the ferrite has a thickness of 0.08mm to 0.12mm, a magnetic permeability of greater than 140 and a magnetic reluctance of less than 5.
6. The antenna structure of claim 3, wherein the NFC antenna coil is rectangular in shape with a minimum of 0.5mm trace width and a minimum of 0.2mm trace pitch, and wherein the NFC antenna coil has a minimum of 20mm length, 10mm width and 0.05mm thickness.
7. The antenna structure of claim 1, wherein the metal middle frame is a closed breakpoint-free metal middle frame.
8. The antenna structure of claim 1, wherein the metal back cover has a plurality of radiating slots disposed thereon.
9. The antenna structure of claim 3, wherein the NFC antenna coil is 0.3mm-1mm from a top frame of the metal middle frame.
10. A mobile terminal, characterized in that it comprises an NFC antenna structure according to any of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610200632.1A CN107293849B (en) | 2016-03-31 | 2016-03-31 | NFC antenna structure and mobile terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610200632.1A CN107293849B (en) | 2016-03-31 | 2016-03-31 | NFC antenna structure and mobile terminal |
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| Publication Number | Publication Date |
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| CN107293849A CN107293849A (en) | 2017-10-24 |
| CN107293849B true CN107293849B (en) | 2020-01-10 |
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| CN201610200632.1A Active CN107293849B (en) | 2016-03-31 | 2016-03-31 | NFC antenna structure and mobile terminal |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108232428A (en) * | 2018-01-03 | 2018-06-29 | 上海传英信息技术有限公司 | Mobile terminal and its antenna installation method |
| CN113497331B (en) * | 2020-04-03 | 2023-03-10 | Oppo广东移动通信有限公司 | Electronic equipment and wearable equipment |
| CN112611920A (en) * | 2020-12-03 | 2021-04-06 | 深圳市卓睿通信技术有限公司 | Ferrite consistency detection jig and detection method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006085552A (en) * | 2004-09-17 | 2006-03-30 | Oji Paper Co Ltd | Reader and / or writer device |
| CN103294247A (en) * | 2012-03-05 | 2013-09-11 | 宏达国际电子股份有限公司 | Touch panel structure, touch display panel structure and communication device thereof |
| CN104993215A (en) * | 2015-06-01 | 2015-10-21 | 瑞声精密制造科技(常州)有限公司 | Nfc antenna structure |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9798968B2 (en) * | 2013-01-18 | 2017-10-24 | Féinics Amatech Teoranta | Smartcard with coupling frame and method of increasing activation distance of a transponder chip module |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006085552A (en) * | 2004-09-17 | 2006-03-30 | Oji Paper Co Ltd | Reader and / or writer device |
| CN103294247A (en) * | 2012-03-05 | 2013-09-11 | 宏达国际电子股份有限公司 | Touch panel structure, touch display panel structure and communication device thereof |
| CN104993215A (en) * | 2015-06-01 | 2015-10-21 | 瑞声精密制造科技(常州)有限公司 | Nfc antenna structure |
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| CN107293849A (en) | 2017-10-24 |
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