CN115117629A - Loop antenna shielding structure - Google Patents
Loop antenna shielding structure Download PDFInfo
- Publication number
- CN115117629A CN115117629A CN202210946968.8A CN202210946968A CN115117629A CN 115117629 A CN115117629 A CN 115117629A CN 202210946968 A CN202210946968 A CN 202210946968A CN 115117629 A CN115117629 A CN 115117629A
- Authority
- CN
- China
- Prior art keywords
- loop antenna
- shielding layer
- metal
- metal shielding
- opening
- 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.)
- Withdrawn
Links
- 229910052751 metal Inorganic materials 0.000 claims abstract description 40
- 239000002184 metal Substances 0.000 claims abstract description 40
- 230000005684 electric field Effects 0.000 claims abstract description 17
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 230000006698 induction Effects 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- 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
- H01Q7/04—Screened antennas
Landscapes
- Details Of Aerials (AREA)
Abstract
The utility model provides a loop antenna shielding structure, belongs to loop antenna's radio frequency identification technical field, including loop antenna, the metal shielding layer is established to the outside cover of loop antenna, metal shielding layer single-point ground connection to the metal shielding layer is equipped with the opening that opens a circuit, the metal shielding layer is to electric field shield, does not shield magnetic field. The invention can shield the loop antenna in the electric field from the external electric field interference, and meanwhile, does not influence the loop antenna to receive the magnetic field signal.
Description
Technical Field
The invention belongs to the technical field of radio frequency identification of loop antennas, and particularly relates to a loop antenna shielding structure.
Background
In some rfid systems, such as various contactless IC card systems, door access systems, and transponder transmission systems on high-speed rails, it is common for readers and transponders to transmit power and receive signals using loop antennas. Because of the close range coupling, loop antennas transmit energy and receive data primarily in the form of magnetic field coupling. The loop antenna is not sensitive to an electric field, but in the radio frequency identification system, after the IC card or the transponder obtains radio frequency induction energy from the reader, the energy of a data signal sent to the reader is not large, and the energy received by the loop antenna of the reader is smaller. In this case, if an alternating electric field exists in the vicinity, the loop antenna still receives a signal induced by the alternating electric field, and interference with the reader is caused, resulting in failure to read the contactless IC card or the transponder.
Particularly, the loop antenna for receiving signals is arranged on the high-speed railway motor car, because a plurality of high-voltage devices are arranged on the high-speed railway motor car, a strong interference electric field is formed, and the received ground wireless signals have low strength, the loop antenna can interfere with the receiving antenna, the signal-to-noise ratio of the receiving end is reduced, and certain influence is brought to the normal running of the high-speed railway motor car.
Disclosure of Invention
In view of the above-mentioned drawbacks and disadvantages of the prior art, the present invention provides a shielding structure for a loop antenna, which can shield the loop antenna placed in an electric field, so that the loop antenna is completely free from the interference of the electric field, and at the same time, has no effect on the magnetic field passing through the loop antenna, so that the signal received by the loop antenna is not affected.
In order to achieve the purpose, the invention adopts the main technical scheme that:
the utility model provides a loop antenna shielding structure, includes loop antenna, the metal shielding layer is established to the outside cover of loop antenna, metal shielding layer single-point ground to the metal shielding layer is equipped with the opening that opens a circuit, the metal shielding layer is to electric field shield, does not shield magnetic field.
Furthermore, the metal shielding layer is of a metal tubular structure, and the loop antenna is wound in the metal tube.
Further, the metal shielding layer forms a ring structure with an opening along with the loop antenna.
Further, the opening gap is less than or equal to 1% of the circumference of the single ring surrounded by the antenna.
Further, the opening is used as a feed line outlet of the loop antenna.
Further, the metal tube is an aluminum metal tube.
The invention has the beneficial effects that: the invention relates to a shielding structure of a loop antenna, which can shield the loop antenna in an electric field, so that the loop antenna is not interfered by the electric field, has no shielding effect on the magnetic field passing through the loop antenna, does not influence the signal received by the loop antenna and shields the interference electric field at the same time, and improves the signal-to-noise ratio of a receiving end.
Drawings
FIG. 1 is a schematic diagram of a loop antenna structure;
FIG. 2 is a schematic view of a shielding structure of a loop antenna according to the present invention;
the components in the figure: 1 is a loop antenna, 2 is a metal shielding layer.
Detailed Description
For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings.
As shown in fig. 2, the present invention is a loop antenna shielding structure, including a loop antenna 1, where the loop antenna 1 is a loop structure wound by an antenna, and because of the loop structure, a magnetic field component can form a magnetic induction current on the loop antenna, so that the loop antenna can receive a magnetic induction signal.
The metal shielding layer 2 is sleeved outside the loop antenna 1, the metal shielding layer 2 is grounded in a single point mode, the metal shielding layer 2 is provided with a broken circuit opening, and the metal shielding layer 2 shields an electric field and does not shield a magnetic field. The metal shielding layer 2 is of a metal tubular structure, and the loop antenna is wound in the metal tube. The metal tubular structure may be a circular tubular structure, a square tubular structure or a tubular structure with other shapes as long as the annular antenna can be wrapped in the metal tubular structure. Specifically, the metal tube may be an aluminum metal tube, or may be a metal tube made of another material.
The metal shielding layer 2 forms an annular structure with an opening along with the loop antenna, and the shielding layer becomes a non-closed ring due to the design of the opening, so that a magnetic field component cannot form a closed loop on the metal shielding layer to further form magnetic induction current, and the metal shielding layer cannot shield the magnetic field. The magnetic component of the magnetic field still forms magnetic induction current in the loop antenna, so the metal shielding layer does not influence the loop antenna to receive magnetic field signals.
The opening gap is less than or equal to 1% of the circumference of a single ring formed by the antenna in a surrounding mode, so that the metal shielding layer can better play a role in shielding an electric field.
As long as the metal shielding layer 2 has an opening, the magnetically induced current cannot be formed on the shielding layer, and thus the position of the opening is not limited. As one example, the opening may be used as a feed line outlet of the loop antenna.
The invention can be applied to radio frequency identification systems adopting loop antennas, such as transponder transmission systems in the field of high-speed rail signals, various non-contact IC card systems including public transportation subway cards, ID card reading and identification, access control systems and the like, is used for shielding the interference of an alternating electric field to the loop antennas, and simultaneously can not generate any influence on the magnetic field signals received by the loop antennas due to the addition of the shielding structure.
Although embodiments of the present invention have been shown and described above, it should be understood that the above embodiments are illustrative and not restrictive, and that those skilled in the art may make changes, modifications, substitutions and alterations to the above embodiments without departing from the scope of the present invention.
Claims (6)
1. The utility model provides a loop antenna shielding structure, its characterized in that includes loop antenna, the metal shielding layer is established to the outside cover of loop antenna, metal shielding layer single-point ground connection to the metal shielding layer is equipped with the opening that opens circuit, the metal shielding layer is to electric field shield, does not shield magnetic field.
2. The loop antenna shielding structure of claim 1, wherein: the metal shielding layer is of a metal tubular structure, and the loop antenna is wound in the metal tube.
3. A loop antenna shielding structure as claimed in claim 2, wherein: the metal shielding layer forms a ring structure with an opening along with the loop antenna.
4. A loop antenna shield structure as defined in claim 3, wherein: the opening gap is less than or equal to 1% of the circumference of a single ring formed by the surrounding of the antenna.
5. The loop antenna shielding structure of claim 4, wherein: the opening is used as a feed line leading-out opening of the loop antenna.
6. The loop antenna shielding structure of any one of claims 1 to 5, wherein: the metal tube is an aluminum metal tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210946968.8A CN115117629A (en) | 2022-08-09 | 2022-08-09 | Loop antenna shielding structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210946968.8A CN115117629A (en) | 2022-08-09 | 2022-08-09 | Loop antenna shielding structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115117629A true CN115117629A (en) | 2022-09-27 |
Family
ID=83335431
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210946968.8A Withdrawn CN115117629A (en) | 2022-08-09 | 2022-08-09 | Loop antenna shielding structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115117629A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1762072A (en) * | 2003-03-19 | 2006-04-19 | 索尼株式会社 | Antenna device and antenna device manufacturing method |
| CN203406418U (en) * | 2013-06-18 | 2014-01-22 | 华北电力大学 | Antenna electromagnetic shielding housing of on-line monitoring device for high tension transmission line |
| CN107543977A (en) * | 2017-09-28 | 2018-01-05 | 浙江天创信测通信科技有限公司 | A kind of isotropism emf sensor |
| CN207215908U (en) * | 2017-09-28 | 2018-04-10 | 浙江天创信测通信科技有限公司 | A kind of isotropism emf sensor |
| CN108028121A (en) * | 2015-09-17 | 2018-05-11 | 高通股份有限公司 | Wireless power transfer antenna with separation shielding part |
| CN110267598A (en) * | 2017-01-09 | 2019-09-20 | 皇家飞利浦有限公司 | A kind of stethoscope device and method handling the Breathiness generated by object |
| KR20220089360A (en) * | 2020-12-21 | 2022-06-28 | 삼성전자주식회사 | Electronic device including coil antenna |
-
2022
- 2022-08-09 CN CN202210946968.8A patent/CN115117629A/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1762072A (en) * | 2003-03-19 | 2006-04-19 | 索尼株式会社 | Antenna device and antenna device manufacturing method |
| CN203406418U (en) * | 2013-06-18 | 2014-01-22 | 华北电力大学 | Antenna electromagnetic shielding housing of on-line monitoring device for high tension transmission line |
| CN108028121A (en) * | 2015-09-17 | 2018-05-11 | 高通股份有限公司 | Wireless power transfer antenna with separation shielding part |
| CN110267598A (en) * | 2017-01-09 | 2019-09-20 | 皇家飞利浦有限公司 | A kind of stethoscope device and method handling the Breathiness generated by object |
| CN107543977A (en) * | 2017-09-28 | 2018-01-05 | 浙江天创信测通信科技有限公司 | A kind of isotropism emf sensor |
| CN207215908U (en) * | 2017-09-28 | 2018-04-10 | 浙江天创信测通信科技有限公司 | A kind of isotropism emf sensor |
| KR20220089360A (en) * | 2020-12-21 | 2022-06-28 | 삼성전자주식회사 | Electronic device including coil antenna |
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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 | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20220927 |