CN107293856B - NFC antenna structure and mobile terminal - Google Patents
NFC antenna structure and mobile terminal Download PDFInfo
- Publication number
- CN107293856B CN107293856B CN201610201031.2A CN201610201031A CN107293856B CN 107293856 B CN107293856 B CN 107293856B CN 201610201031 A CN201610201031 A CN 201610201031A CN 107293856 B CN107293856 B CN 107293856B
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- nfc
- nfc antenna
- antenna
- metal
- middle frame
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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
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
- H01Q1/2225—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—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
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
- H01Q7/06—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop with core of ferromagnetic material
Abstract
The embodiment of the invention discloses an NFC antenna structure, which comprises: the NFC antenna comprises a non-metal front cover plate, a metal middle frame, a display screen, a metal back cover and an NFC antenna; the metal middle frame comprises a top frame, a bottom frame and two side frames, the display screen comprises a top edge, a bottom edge and two side edges, the NFC antenna is located in a cavity formed by the metal back plate, the top frame of the metal middle frame, the top edge of the display screen and the nonmetal front cover plate, and the NFC antenna is close to the top frame of the metal middle frame. 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 rear cover, and a gap is formed in the metal rear 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: the size of the gap formed in the metal back cover is limited, 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 reduces 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. The problem of the radiating performance of NFC antenna among the prior art is not good can be solved.
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 non-metal front cover plate, a metal middle frame, a display screen, a metal back cover and an NFC antenna; the metal middle frame comprises a top frame, a bottom frame and two side frames, the display screen comprises a top edge, a bottom edge and two side edges, the NFC antenna is located in a cavity formed by the metal back plate, the top frame of the metal middle frame, the top edge of the display screen and the nonmetal front cover plate, and the NFC antenna is close to the top frame of the metal middle frame.
The NFC antenna comprises an NFC antenna coil, a flexible circuit board and a ferrite, wherein the NFC antenna coil is packaged in the flexible circuit board, and the flexible circuit board is attached to the flexible circuit board.
Wherein, still include: the NFC antenna comprises a PCB mainboard, a first antenna matching circuit, a second antenna matching circuit, a first low-pass filter circuit, a second low-pass filter circuit and an NFC control chip located on the PCB mainboard, wherein the PCB mainboard is arranged between the display screen and the metal back cover, the NFC antenna comprises a first feed portion and a second feed portion, the first feed portion is connected with the NFC control chip through the first antenna matching circuit and the first low-pass filter circuit, and the second feed portion is connected with the NFC control chip through the second antenna matching circuit and the second low-pass filter circuit.
The first antenna matching circuit and the second antenna matching circuit are symmetrical to each other, and the first low-pass filter circuit and the second low-pass filter circuit 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 NFC antenna coil is coplanar and is a loop-shaped line with equal spacing, the minimum value of the line width is 0.5mm, the minimum value of the line spacing 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 rear cover.
And the distance between the NFC antenna coil and the top frame of the metal middle frame is 0.3mm-1 mm.
Correspondingly, an embodiment of the present invention provides a mobile terminal, including any of the above 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 the NFC antenna in fig. 1 a;
fig. 1c is a schematic diagram of the structure of the antenna coil of the NFC antenna of 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 to fig. 1c, the structural schematic diagram of an NFC antenna structure provided in the embodiment of the present invention is that, in the 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, 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; nonmetal front shroud, metal center 10 and the metal back of the body lid are assembled back and are formed a cavity together, the laminating of nonmetal front shroud is in the top of display screen 11, nonmetal front shroud can be transparent plastic material, from the top down has set gradually nonmetal front shroud in the cavity, display screen 11, the PCB mainboard, the metal sheet, a battery, the metal back of the body lid, two sides of metal sheet and two side frame fixed connection of metal center, this metal sheet plays the supporting role, the PCB mainboard is located this metal sheet, display screen 11 is located the PCB mainboard. The length of the display screen 11 is smaller than the length of the metal middle frame 10, so that the top edge 111 of the display screen 11 and the top frame 101 of the metal middle frame 10 form a window, the window forms a cavity with the upper non-metal front cover plate and the lower metal back plate, the NFC antenna 12 is located in the cavity, and the NFC antenna 12 is close to the top frame 101 of the metal middle frame 10, that is, the NFC antenna 12 is spaced from the top frame 101 of the metal middle frame 10 by a very small distance, but is not electrically connected to the top frame 101 of the metal middle frame 10.
When the NFC antenna 12 needs to communicate with an external reader-writer, the reader-writer is close to the upper portion of the display screen 11 of the mobile terminal, the NFC antenna 12 utilizes the NFC antenna coil of the reader-writer and the metal middle frame to radiate electromagnetic signals, the coupling area is increased under the interaction of the NFC antenna coil and the metal middle frame, the area of the NFC antenna coil is not required to be increased, the NFC communication can be carried out between the reader-writer and the NFC antenna in the area with the preset distance above the display screen 11, meanwhile, the NFC function can be used above the display screen 11 by a user, the use habit of the user is met, and the use of the user is facilitated.
Optionally, in a possible embodiment of the present invention, the NFC antenna includes an NFC antenna coil, a flexible circuit board, and a ferrite, the NFC antenna coil is packaged in the flexible circuit board, and the flexible circuit board is attached to the ferrite.
Specifically, referring to fig. 1b, the NFC antenna 12 includes an NFC antenna coil 124, a flexible circuit board (not shown), and a ferrite 123, the NFC antenna coil 124 is packaged in the flexible circuit board, the NFC antenna coil 124 is used for coupling electromagnetic signals, the flexible circuit board is attached to the ferrite 123, the ferrite 123 is fixed on the PCB main board or a support portion is disposed on the metal plate or the metal middle frame 10, and the ferrite 123 is fixed on the support portion.
Optionally, in a possible implementation manner of the present invention, the NFC antenna structure further includes: the NFC antenna comprises a first feed part and a second feed part, wherein the first feed part is connected with the NFC control chip through the first antenna matching circuit and the first low-pass filter circuit, and the second feed part is connected with the NFC control chip through the second antenna matching circuit and the second low-pass filter circuit.
Specifically, referring to fig. 1a, a metal plate is disposed in the metal middle frame 10. Two side edges of the metal plate are respectively and fixedly connected with two side frames (a first side frame 102 and a second side frame 104) of the metal middle frame 10, the PCB main board is placed on the metal plate and can be fixed through screws, and the metal plate plays a role in supporting the PCB main board. Referring to fig. 1d, the first antenna matching circuit 13, the second antenna matching circuit 15, the first low pass filter circuit 14 and the second low pass filter circuit 16 are located on the PCB main board, and the NFC antenna coil 124, the flexible circuit board and the ferrite 123 of the NFC antenna 12 may not be located on the PCB main board, for example: a support part on which the NFC antenna coil 124, 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 124, so that the operating frequency band of the NFC antenna coil 124 is tuned to a desired specified operating frequency band, for example: the frequency point of the NFC antenna coil 124 is an operating frequency band of 13.56MHz, and the first low-pass filter circuit 14 and the second low-pass filter circuit 16 are used for filtering high-frequency noise in the electromagnetic signal. The end of the NFC antenna coil 124 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 circuit 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 some embodiments 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 circuit and the second low-pass filter circuit 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 circuit 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, the NFC antenna coil is coplanar loop-shaped wires with equal spacing, a minimum value of a width of the wires is 0.5mm, a minimum value of a spacing of the wires is 0.2mm, a minimum value of a length of the NFC antenna coil is 20mm, a minimum value of a width of the wires is 10mm, and a minimum value of a thickness of the NFC antenna coil is 0.05 mm.
Specifically, referring to the schematic structural diagram of the NFC antenna coil shown in fig. 1c, the NFC antenna coil 124 is rectangular, and the NFC antenna coil 124 is coplanar and is an equidistant loop-shaped trace, that is, the traces of the NFC antenna coil 124 are all located on the same plane, the distance between two adjacent traces is a fixed value, the width of the trace is a fixed value, and two feeding portions (a first feeding portion 121 and a second feeding portion 122) are disposed at two ends of the NFC antenna coil 124. The minimum value of the length of the NFC antenna coil 124 is 20mm, the minimum value of the width is 10mm, the minimum value of the thickness is 0.05mm, the minimum value of the trace width of the NFC antenna coil 124 is 0.5mm, and the minimum value of the trace distance is 0.2 mm.
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, in a possible embodiment of the present invention, the metal rear cover is provided with a plurality of radiation slits.
Specifically, the metal rear cover is provided with two parallel radiation gaps, the metal rear 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.
In one possible embodiment of the invention, the distance between the NFC antenna coil and the top frame of the metal middle frame is 0.3mm-1 mm.
Specifically, the NFC antenna coil 124 is close to the top frame 101 of the metal middle frame 10, and the distance between the NFC antenna coil 124 and the top frame 101 of the metal middle frame 10 is 0.3mm to 1mm, so that the NFC antenna coil 124 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 region 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. Other mobile terminals are also possible, such 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:
the NFC antenna comprises a non-metal front cover plate, a metal middle frame, a display screen, a metal back cover and a Near Field Communication (NFC) antenna; the metal middle frame comprises a top frame, a bottom frame and two side frames, the display screen comprises a top edge, a bottom edge and two side edges, the Near Field Communication (NFC) antenna is located in a cavity formed by the metal back plate, the top frame of the metal middle frame, the top edge of the display screen and the nonmetal front cover plate, and the NFC antenna is close to the top frame of the metal middle frame.
2. The antenna structure of claim 1, wherein the NFC antenna comprises an NFC antenna coil, a flexible circuit board, and a ferrite, the NFC antenna coil being encapsulated within the flexible circuit board, the flexible circuit board being attached to the ferrite.
3. The antenna structure of claim 1, further comprising: the NFC antenna comprises a PCB main board, a first antenna matching circuit, a second antenna matching circuit, a first low-pass filter circuit, a second low-pass filter circuit and an NFC control chip located on the PCB main board, wherein the PCB main board is arranged between the display screen and the metal back cover, the NFC antenna comprises a first feed portion and a second feed portion, the first feed portion is connected with the NFC control chip through the first antenna matching circuit and the first low-pass filter circuit, and the second feed portion is connected with the NFC control chip through the second antenna matching circuit and the second low-pass filter circuit.
4. The antenna structure of claim 3, wherein said first antenna matching circuit and said second antenna matching circuit are symmetrical to each other, and said first low pass filter circuit and said second low pass filter circuit are symmetrical to each other.
5. The antenna structure of claim 2, 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 2, wherein the NFC antenna coil is rectangular in shape, the NFC antenna coil is a coplanar, equidistant meander-shaped trace, the minimum value of the trace width is 0.5mm, the minimum value of the trace pitch is 0.2mm, the minimum value of the NFC antenna coil length is 20mm, the minimum value of the width is 10mm, and the minimum value of the thickness is 0.05 mm.
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 2, 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 antenna structure according to any of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610201031.2A CN107293856B (en) | 2016-03-31 | 2016-03-31 | NFC antenna structure and mobile terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610201031.2A CN107293856B (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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| CN107293856A CN107293856A (en) | 2017-10-24 |
| CN107293856B true CN107293856B (en) | 2020-11-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610201031.2A Active CN107293856B (en) | 2016-03-31 | 2016-03-31 | NFC antenna structure and mobile terminal |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109216942B (en) * | 2018-09-11 | 2023-12-19 | 深圳市信维通信股份有限公司 | 5G millimeter wave mobile terminal antenna system based on metal frame |
| WO2020096094A1 (en) * | 2018-11-09 | 2020-05-14 | Samsung Electronics Co., Ltd. | Near field communication antenna structure, housing with the same, and electronic terminal |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103918125A (en) * | 2012-09-26 | 2014-07-09 | 株式会社村田制作所 | Antenna device and electronic device provided with same |
| US20150009077A1 (en) * | 2013-07-03 | 2015-01-08 | Samsung Electronics Co., Ltd. | Cover of a mobile device and mobile device including the same |
| CN104821438A (en) * | 2014-01-31 | 2015-08-05 | Tdk株式会社 | Antenna device and portable electronic device using the same |
| CN204947063U (en) * | 2015-07-08 | 2016-01-06 | 瑞声精密制造科技(常州)有限公司 | Nfc antenna system and electronic equipment |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5639236B1 (en) * | 2013-07-31 | 2014-12-10 | 佳弘 東 | Portable electronic devices |
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- 2016-03-31 CN CN201610201031.2A patent/CN107293856B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103918125A (en) * | 2012-09-26 | 2014-07-09 | 株式会社村田制作所 | Antenna device and electronic device provided with same |
| US20150009077A1 (en) * | 2013-07-03 | 2015-01-08 | Samsung Electronics Co., Ltd. | Cover of a mobile device and mobile device including the same |
| CN104821438A (en) * | 2014-01-31 | 2015-08-05 | Tdk株式会社 | Antenna device and portable electronic device using the same |
| CN204947063U (en) * | 2015-07-08 | 2016-01-06 | 瑞声精密制造科技(常州)有限公司 | Nfc antenna system and electronic equipment |
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| CN107293856A (en) | 2017-10-24 |
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