CN106961003B - NFC antenna - Google Patents
NFC antenna Download PDFInfo
- Publication number
- CN106961003B CN106961003B CN201710316670.8A CN201710316670A CN106961003B CN 106961003 B CN106961003 B CN 106961003B CN 201710316670 A CN201710316670 A CN 201710316670A CN 106961003 B CN106961003 B CN 106961003B
- Authority
- CN
- China
- Prior art keywords
- conductive coupling
- antenna
- antenna coil
- induction layer
- hole
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000008878 coupling Effects 0.000 claims abstract description 35
- 238000010168 coupling process Methods 0.000 claims abstract description 35
- 238000005859 coupling reaction Methods 0.000 claims abstract description 35
- 230000006698 induction Effects 0.000 claims abstract description 30
- 229910000859 α-Fe Inorganic materials 0.000 claims description 7
- 238000005507 spraying Methods 0.000 claims description 2
- 238000004891 communication Methods 0.000 abstract description 10
- 239000002184 metal Substances 0.000 description 8
- 230000001939 inductive effect Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 2
- 239000011358 absorbing material Substances 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
Classifications
-
- 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
-
- 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
- H01Q1/2216—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 interrogator/reader equipment
-
- 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
-
- 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
-
- 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 invention discloses an NFC antenna, which comprises an antenna coil and a conductive coupling induction layer, wherein the conductive coupling induction layer is provided with a through hole and a groove, the groove is arranged from the through hole to the edge of the conductive coupling induction layer, so that the conductive coupling induction layer is of a C-shaped structure, the antenna coil is embedded into the through hole and is provided with gaps around the through hole, and the conductive coupling induction layer around the through hole and the antenna coil are positioned on the same plane. The NFC antenna has a longer communication distance, so that miniaturization of the antenna is realized, and design flexibility is improved.
Description
Technical Field
The invention relates to an NFC antenna, and belongs to the technical field of antennas for wireless communication.
Background
The NFC antenna coil and the card reader antenna coil are similar to a transformer in functional structure, the card reader coil is a primary coil of the transformer, the NFC coil is equivalent to a secondary coil of the transformer, high-frequency alternating current (13.56 MHz) passes through the primary coil, a high-frequency magnetic field is generated around the coil in a coupling mode, and if the NFC antenna coil is close to the magnetic field, alternating magnetic force lines penetrate through the coil, so that enough current is generated in the NFC coil to read chip information. Therefore, the quality of the NFC antenna depends on the magnitude of the induced current on the NFC antenna when the NFC antenna is located at the same position from the reader coil.
According to a calculation formula of the induction current, the induction current of the NFC antenna is in direct proportion to the number of turns of the coil, the area enclosed by the coil and the magnetic conductivity inside the coil, and is in inverse proportion to the resistance of the coil. Because the number of turns of the coil cannot be infinitely increased, the coil area cannot be limited by resistance and resonance frequencyCan be infinitely large and limited by the structure of the mobile phone, and the practical usable area is 9-12 cm 2 The larger and better the magnetic permeability is, which is also the reason why ferrite materials are better than wave-absorbing materials; meanwhile, the wire length is proper and the wire width is wider within the allowable range.
At present, due to the structure of the intelligent mobile phone, most mobile phones use ferrite and FPC to form NFC antennas, and the antenna area is larger than 12cm 2 The thickness is greater than 0.4mm, which determines that the antenna can only be placed on the battery cover above the battery, while requiring a height of 0.5mm to remain between the battery and the cover. The problem thus arises that for ultra-thin machines or machines with limited space, the gap between the battery and the cover cannot be guaranteed; furthermore, the antenna is attached to the battery cover, so that the contact between the antenna and the main board is problematic as the number of times that the battery cover is opened by a user increases; in addition, the price of the NFC antenna is high due to the fact that the area is too large.
In order to reduce the coil area to adapt to miniaturization of electronic products, an antenna structure is proposed in the prior art, wherein a hole is formed in a metal shell, a groove is formed in the metal shell, one end of the groove starts from the hole, the other end of the groove extends to the edge of the metal shell, and a coil is arranged under the hole and attached to the metal shell. However, the actual communication distance of the structure is still not ideal.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention provides a miniaturized NFC antenna, which solves the problem that the communication distance of the existing miniaturized NFC antenna is not ideal.
The technical scheme of the invention is as follows: the utility model provides an NFC antenna, includes antenna coil and conductive coupling inductive layer, conductive coupling inductive layer is equipped with through-hole and groove, the edge setting of groove from through-hole to conductive coupling inductive layer makes conductive coupling inductive layer be C type structure, antenna coil embedding the through-hole just is equipped with the clearance around with the through-hole, conductive coupling inductive layer around the through-hole is in the coplanar with antenna coil.
Further, the conductive coupling induction layer is arranged in a conductive spraying area of the battery shell, the antenna coil is arranged on the inner side of the rear cover, and the rear cover is buckled with the battery shell.
Further, the width of the groove is 0.5-3 mm.
Further, the distance of the gap is 0.3-1 mm.
Further, a ferrite is included, which covers the antenna coil and has the same outer contour as the antenna coil.
The technical scheme provided by the invention has the advantages that: the conductive coupling induction layer and the antenna coil are positioned on the same plane, the coupling induction is stronger than the non-same plane, the induction amplification is stronger, and the communication distance is longer; the conductive coupling induction layer can be sprayed on the battery shell of the mobile phone by an LDS process, and then a non-metal rear cover is adopted, so that the radiation peripheral environment of the antenna is good, and the communication distance is also enhanced; the antenna coil area can be reduced through the large-area conductive coupling induction layer to achieve good communication, and meanwhile, the gap between the rear cover and the battery case can be reduced to the minimum, so that the NFC antenna is miniaturized, and the design flexibility is improved.
Drawings
Fig. 1 is a schematic structural diagram of an NFC antenna according to the present invention.
Fig. 2 is a schematic cross-sectional structure of an NFC antenna according to the present invention.
Fig. 3 is a schematic cross-sectional structure of a NFC antenna in the prior art.
Detailed Description
The invention is further illustrated, but is not limited, by the following examples.
Referring to fig. 1 and 2, the NFC antenna of the present embodiment includes an antenna coil 1 and a conductive coupling induction layer 2.
Wherein the antenna coil 1 is manufactured in the same way as in the prior art, in such a way that the metal conductors are wound in turn. In a specific application, the antenna coil 1 is mainly an FPC coil. A layer of ferrite 3 is covered above the antenna coil 1, and the outer contour of the ferrite 3 is the same as the outer contour of the antenna coil 1. And finding a proper position with enough area on the inner side of the rear cover 4 of the mobile phone, and attaching the antenna coil 1 and the ferrite 3 on the inner side of the rear cover 4. In this embodiment, the area of the antenna coil is about 6cm2, and the mobile phone rear cover 4 is made of plastic.
In the bar-type smart phone, the phone shell includes a front panel, a battery shell 5 and a rear cover 4, and the battery shell 5 is mainly used for carrying a mobile phone motherboard, a battery and various slots. The conductive coupling induction layer 2 is disposed on the battery case 5, specifically, is sprayed on the battery case 5 by an LDS process.
The structure of the conductive coupling inducing layer 2 is such that it is provided with a via 6 and a slot 7. The grooves 7 are arranged from the through holes 6 to the edges of the conductive coupling induction layer 2, and the width of the grooves 7 is 0.5-3 mm, so that the conductive coupling induction layer 2 is of a C-shaped structure. A recess 8 is formed in the battery case 5 at a position corresponding to the antenna coil 1. The recess 8 is also the location of the via 6 of the conductive coupling sensing layer 2. When the rear cover 4 attached with the antenna coil 1 is buckled with the battery case 5, the antenna coil 1 is embedded into the concave 8, namely, the through hole 6 of the conductive coupling induction layer 2. Referring to fig. 2, the embedding is so-called embedding such that the upper surface of the conductive coupling induction layer 2 is not higher than the upper surface of the antenna coil 1, and the lower surface of the conductive coupling induction layer 6 is not lower than the lower surface of the antenna coil 1.
Theoretically, the edges of the antenna coil 1 and the through hole 6 can be infinitely close, and in practical implementation, considering the error of manual lamination of the FPC antenna, the gaps 9 around the antenna coil 1 and the through hole 6 should be controlled to be 0.3-1 mm.
Fig. 3 shows a cross-sectional structure of a prior art NFC antenna, where a metal sheet 101 is attached to an antenna coil 102 for enhancing the communication distance of the NFC antenna.
Under the premise that the area of the antenna coil is the same, the conductive coupling induction layer 2 and the area of the metal sheet 101 in the NFC antenna in the prior art are the same, the communication distance test is performed on the NFC antenna in the embodiment and the NFC antenna in the prior art. Antenna coils are arranged independently, and when no metal sheet is added and no conductive coupling induction layer is arranged, the card swiping distance is as follows: the machine is not powered off, the machine is powered on by 0.8cm, and the index can not be met far; test is performed by adopting the embodiment, and the card swiping distance is as follows: powering off 1.4cm, and powering on 3cm to meet the requirement; adopt prior art NFC antenna to test, the distance of punching the card: and the machine is turned off by 1.0cm and turned on by 2.4cm. The communication distance of the embodiment is obviously better than that of the prior art.
Claims (4)
1. The utility model provides an NFC antenna, includes antenna coil and conductive coupling induction layer, its characterized in that, conductive coupling induction layer is equipped with through-hole and groove, the edge setting of groove from the through-hole to conductive coupling induction layer makes conductive coupling induction layer be C type structure, antenna coil embedding the through-hole and be equipped with the clearance around with the through-hole, conductive coupling induction layer around the through-hole is in the coplanar with antenna coil, conductive coupling induction layer is set up in the conductive spraying area of battery case, antenna coil sets up in the back lid inboard, back lid and battery case lock, the battery case is equipped with the indent corresponding with antenna coil position, antenna coil embedding the indent, conductive coupling induction layer's upper surface is not higher than antenna coil's upper surface, conductive coupling induction layer's lower surface is not less than antenna coil's lower surface.
2. NFC antenna according to claim 1 characterised in that the width of the slot is 0.5-3 mm.
3. NFC antenna according to claim 1 characterised in that the distance of the gap is 0.3-1 mm.
4. An NFC antenna according to claim 1 including ferrite covering the antenna coil and having the same outer profile as the antenna coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710316670.8A CN106961003B (en) | 2017-05-08 | 2017-05-08 | NFC antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710316670.8A CN106961003B (en) | 2017-05-08 | 2017-05-08 | NFC antenna |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106961003A CN106961003A (en) | 2017-07-18 |
| CN106961003B true CN106961003B (en) | 2024-02-13 |
Family
ID=59482972
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710316670.8A Active CN106961003B (en) | 2017-05-08 | 2017-05-08 | NFC antenna |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106961003B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110247166A (en) * | 2019-05-24 | 2019-09-17 | 禾邦电子(苏州)有限公司 | A kind of NFC antenna and mobile terminal |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104934692A (en) * | 2015-07-02 | 2015-09-23 | 上海安费诺永亿通讯电子有限公司 | Novel NFC/RFID antenna apparatus and mobile terminal thereof |
| CN105048097A (en) * | 2015-09-01 | 2015-11-11 | 上海安费诺永亿通讯电子有限公司 | Three-dimensional near-field antenna structure |
| CN206712013U (en) * | 2017-05-08 | 2017-12-05 | 常熟市泓博通讯技术股份有限公司 | Nfc antenna |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101580518B1 (en) * | 2012-04-05 | 2015-12-28 | 엘지전자 주식회사 | Antenna and mobile terminal therein |
-
2017
- 2017-05-08 CN CN201710316670.8A patent/CN106961003B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104934692A (en) * | 2015-07-02 | 2015-09-23 | 上海安费诺永亿通讯电子有限公司 | Novel NFC/RFID antenna apparatus and mobile terminal thereof |
| CN105048097A (en) * | 2015-09-01 | 2015-11-11 | 上海安费诺永亿通讯电子有限公司 | Three-dimensional near-field antenna structure |
| CN206712013U (en) * | 2017-05-08 | 2017-12-05 | 常熟市泓博通讯技术股份有限公司 | Nfc antenna |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106961003A (en) | 2017-07-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4232474B2 (en) | Electronic equipment with communication function | |
| KR101177302B1 (en) | Wireless antenna for both radio frequency identification and wireless charging with electromagnetic waves absorber, and manufacturing method thereof | |
| CN204741074U (en) | Be applied to NFC antenna that has terminal of lid behind metal and terminal equipment thereof | |
| JP3975918B2 (en) | Antenna device | |
| EP1775794B1 (en) | Antenna module magnetic core member, antenna module, and mobile information terminal using the same | |
| CN204442449U (en) | Be applicable to NFC device and the mobile terminal of the mobile terminal with metal edge frame | |
| US20140087658A1 (en) | Communication device | |
| EP2911243B1 (en) | Electronic device and antenna device | |
| CN105742787A (en) | Metal shell-based near field communication device, electronic equipment and method | |
| CN106972237B (en) | Ultra-wideband high-performance NFC antenna system based on metal backshell | |
| CN204516900U (en) | There is NFC device and the wearable device of the wearable device of metal outer frame | |
| CN104767032A (en) | NFC device of wearable device with metal outer frame and wearable device | |
| CN201928324U (en) | Terminal | |
| CN106961003B (en) | NFC antenna | |
| CN209217193U (en) | Communication equipment | |
| KR20150105513A (en) | Metal card with antenna | |
| CN102176533B (en) | Integrated structure of radio frequency identification (RFID) antenna and mobile communication terminal | |
| CN202617103U (en) | NFC module and mobile terminal applying same | |
| CN206712013U (en) | Nfc antenna | |
| CN202059452U (en) | Mobile terminal possessing radio frequency identification function | |
| CN104463312B (en) | A kind of composite construction of smart card and battery of mobile terminal | |
| CN203814062U (en) | Electronic equipment | |
| CN102930330A (en) | Near field communication (NFC) tag antenna | |
| KR101709477B1 (en) | Antenna module and portable device having the same | |
| KR20120134402A (en) | A mobile phone case to which a rf card is embedded and a mobile phone |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20231113 Address after: 235300 East side of Yefeng Road and South side of Lihua Road in Dangshan County Economic Development Zone, Suzhou City, Anhui Province Applicant after: Anhui Hongjia Technology Co.,Ltd. Address before: 215500 8 Liuzhou Road, Yushan hi tech Industrial Park, Changshou City, Suzhou, Jiangsu. Applicant before: CHANGSHU HONGBO COMMUNICATION TECHNOLOGY Co.,Ltd. |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |