CN105428799A - Radio-frequency antenna - Google Patents
Radio-frequency antenna Download PDFInfo
- Publication number
- CN105428799A CN105428799A CN201510771073.5A CN201510771073A CN105428799A CN 105428799 A CN105428799 A CN 105428799A CN 201510771073 A CN201510771073 A CN 201510771073A CN 105428799 A CN105428799 A CN 105428799A
- Authority
- CN
- China
- Prior art keywords
- radio
- frequency antenna
- aerial coil
- antenna
- frequency
- 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.)
- Pending
Links
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
-
- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
- G06K19/0772—Physical layout of the record carrier
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Near-Field Transmission Systems (AREA)
Abstract
The invention relates to a radio-frequency antenna comprising an antenna coil, an antenna matching module and a metal layer. The antenna coil is used for transmitting or receiving electromagnetic wave signals. The antenna matching module is connected with the antenna coil and used for transmitting or receiving electric signals. The relative position of the metal layer and the antenna coil is fixed, and the metal layer and the antenna coil are mutually insulated. The metal layer is used for shielding the electromagnetic wave signals transmitted to the outside by the antenna coil or receiving the electromagnetic wave signals from the outside. The metal layer is provided with a signal channel arranged between the antenna coil and the outside. The antenna coil transmits or receives the electromagnetic wave signals via the signal channel. According to the radio-frequency antenna, influence of external metal on the antenna coil is shielded by the metal layer so that anti-metal performance of the radio-frequency antenna can be enhanced; the antenna coil can transmit or receive the electromagnetic wave signals of the specific direction via the signal channel so that influence of external interference signals on the radio-frequency antenna can be avoided; besides, the outer edge of the electromagnetic wave signals transmitted by the radio-frequency antenna can be controlled, and the problem of coherent jamming and the phenomenon of crosstalk are not generated when multiple radio-frequency antennas are used.
Description
Technical field
The present invention relates to field of radio frequency identification, particularly relate to a kind of radio-frequency antenna.
Background technology
In existing technical field of RFID, minimum radio-frequency recognition system generally comprises radio frequency read-write equipment, radio-frequency antenna and the radio-frequency (RF) tag be fixed on article to be identified, the radiofrequency signal that during use, radio frequency read-write equipment produces exports through radio-frequency antenna, radio-frequency (RF) tag in radio frequency antenna recognition region carries out the operations such as reading, the information that radio-frequency (RF) tag is carried feeds back to the signal receiving circuit of radio frequency read-write equipment inside again through radio-frequency antenna, after radio frequency read-write equipment processes the information received, the ID that can complete radio frequency label and the object represented by it identifies.Within the system, radio-frequency antenna is the important component part of whole radio-frequency recognition system, and it completes electromagnetic transmitting and receiving in radio-frequency recognition system.
Existing radio-frequency antenna is generally made up of aerial coil and antenna match module two parts.When metal object is near aerial coil, can make its mismatch, standing-wave ratio departs from the hydraulic performance decline causing radio-frequency antenna, and then causes inspection card distance to become near, and energy reflection also can become and makes greatly read-write equipment caloric value increase; When radio-frequency antenna works under the environment having electromagnetic interference, interference signal can strengthen the noise of read-write equipment by radio-frequency antenna, causes the readwrite performance of read-write equipment to decline; In addition, the outer, magnetic field that existing radio-frequency antenna produces is uncontrollable, and it can not be applicable to the occasion of the intensive use of multiple radio-frequency antenna, otherwise can cause to alter between adjacent radio frequency antenna and read and the problem such as interference mutually.
Summary of the invention
Based on this, be necessary to provide a kind of performance not to be subject to ectocine, can launch or receive the radio-frequency antenna of specific electromagnetic wave.
A kind of radio-frequency antenna, for carrying out in the radio-frequency recognition system of data communication in a non contact fashion, it comprises: aerial coil, in order to launch or to receive electromagnetic wave signal; Antenna match module, is connected with described aerial coil, in order to launch or to receive the signal of telecommunication; Metal level, and the relative position between described aerial coil is fixed, and insulated from each other; Described metal level is in order to shield described aerial coil outwardly electromagnetic signals or receive from the electromagnetic wave signal in the external world, wherein said metal level leaves signalling channel between described aerial coil and the external world, and described aerial coil is launched by described signalling channel or received electromagnetic wave signal.
Said radio-frequency antenna, by metal level, shields the impact of external metallization on aerial coil, promotes the anti-metal performance of radio-frequency antenna; And metal level leaves signalling channel, metal level can reflect or electromagnetic wave absorption signal, and the electromagnetic wave signal of specific direction can only be launched or receive to aerial coil by signalling channel, and external interference signals so just can be avoided to affect radio-frequency antenna; And the outer of the electromagnetic wave signal that radio-frequency antenna is launched can be controlled, when using multiple radio-frequency antenna, relevant interference problem can not be produced and alter and read phenomenon.
Wherein in an embodiment, described metal level forms the cavity with opening, and described opening is described signalling channel, and described aerial coil is arranged in described cavity.
Wherein in an embodiment, the shape of described cavity is cuboid or square, and described opening is any one side of described cuboid or square.
Wherein in an embodiment, the plane residing for described aerial coil and the plane parallel residing for described opening.
Wherein in an embodiment, described radio-frequency antenna also comprises non-metallic layer, and described non-metallic layer is arranged between described metal level and described aerial coil.
Wherein in an embodiment, described aerial coil with a circle above around formation.
Wherein in an embodiment, described aerial coil is planar coiled with vortex shape and is formed.
Wherein in an embodiment, described metal level is formed by sheet metal.
Wherein in an embodiment, regulate the parameter of the internal component of described antenna match module according to the relative position of described aerial coil and described metal level.
Wherein in an embodiment, described antenna match module is formed with capacitance-resistance matched form or transformer matched form.
Accompanying drawing explanation
Fig. 1 is the structural representation of the radio-frequency antenna in the embodiment of the present invention;
Fig. 2 is the generalized section along A-A in Fig. 1;
Fig. 3 is that radio-frequency antenna in the embodiment of the present invention is with the equivalent circuit diagram of transformer matched form;
Fig. 4 is that radio-frequency antenna in the embodiment of the present invention is with the equivalent circuit diagram of capacitance-resistance matched form.
Embodiment
Please refer to Fig. 1, Fig. 1 is the structural representation of radio-frequency antenna 100 disclosed here, and this radio-frequency antenna 100 can be applied in REID, and its conventional frequency range has low frequency, high frequency (13.56Mhz), hyperfrequency etc.This radio-frequency antenna 100 comprises aerial coil 110, antenna match module 130 and metal level 150.Radio-frequency antenna 110 is connected with antenna match module 130, antenna match module 130 can be connected with radio frequency read-write equipment, electromagnetic wave signal, after antenna match module 130 and aerial coil 110 process, is launched by aerial coil 110 by the radiofrequency signal that radio frequency read-write equipment exports; When returning to radio frequency read-write equipment after aerial coil 110 receives the electromagnetic wave signal of radio frequency mark reflection after antenna match module 130 processes.Metal level 150 insulate with aerial coil 110 and is connected, metal level 150 can shield electromagnetic wave signal, this metal level 150 leaves signalling channel, and electromagnetic wave signal can pass through this signalling channel, thus aerial coil 110 can be launched by this signalling channel or receive electromagnetic wave signal.
This radio-frequency antenna 100 is introduced in detail below in conjunction with specific embodiment.
Please continue to refer to Fig. 1, this aerial coil 110 is individual pen, and its shape is roughly rectangular, and namely the head and the tail of the aerial coil 110 of this rectangle are connected with antenna match module 130.Certainly, this aerial coil 110 can also be that the above coil encircling of a circle is formed, or also can form for coiling in vortex shape in a certain plane.The size, shape, the number of turns, live width etc. of aerial coil 110 suitably can be arranged after considering the performance required by radio-frequency antenna 100.Useful any means forms this aerial coil 100, it can be formed by electric conducting material coiling, after also can being formed by the copper coil on printed circuit board (PCB), also can forming metal film on the substrate with insulating barrier, utilize etching, the technique such as die-cut formed etc.
Antenna match module 130 is used for realizing impedance matching, it will be understood by those skilled in the art that, this antenna match module 130 generally comprises resistance, electric capacity, transformer etc., and this antenna match module 130 can be formed with capacitance-resistance matched form or transformer matched form or other matched form.
Please continue to refer to Fig. 1, in the present embodiment, metal level 150 forms the cuboid that an one side is opening 151, and this opening 151 is signalling channel, and electromagnetic wave signal can pass through this opening 151.At this only for convenience, defining this opening is end face, and the face relative with end face is bottom surface, and all the other four faces are side.Formed the cavity of a non-closed by four sides and bottom surface, aerial coil 110 is arranged in this cavity, and aerial coil 110 is connected for insulating with metal level 150.In the present embodiment, in order to can the stronger electromagnetic wave signal of transmit signal strength, the plane residing for aerial coil 110 can with top surface being parallel.Can insulate by any means and connect aerial coil 110 and metal level 150, can arrange non-metallic layer above bottom surface, this non-metallic layer is insulation, and aerial coil 110 is arranged on non-metallic layer; Can in bottom surface or/and side arrange insulated connecting piece, insulated connecting piece supporting antenna coil 110 etc.Distance between aerial coil 110 and each face of metal level 150, can regulate the parameter of corresponding connected mode to regulate.
After relative position between aerial coil 110 and metal level 150 is fixing, in order to improve the efficiency of transmission of radio-frequency antenna 100, the parameter of antenna match module 130 internal component can be regulated, the standing-wave ratio of radio-frequency antenna 100 is adjusted near 1.In the present embodiment, when ensureing that the parameter such as quality factor, standing-wave ratio of radio-frequency antenna is identical, can by suitably strengthening the mode of plane residing for aerial coil 110 and the spacing of bottom surface and the vertical range in aerial coil and face, four sides, to realize the object of label detection above raising radio-frequency antenna and readwrite performance.Also can when protecting the identical and aerial coil 110 place plane of the parameter such as quality factor, standing-wave ratio of radio-frequency antenna and bottom surface relative position is constant, the mode of the height of four sides of suitably increasing metal level 150 can be passed through, to realize the object reducing outer, radio-frequency antenna surrounding magnetic field.
When the radio-frequency antenna of external metallization object after adjusted, metal level 150 can play effective shielding action, make external metallization object can not affect the inductance value of aerial coil 110, thus change the parameter of radio-frequency antenna 100 and affect the performance of radio-frequency antenna 100.Because metal level 150 can reflect or electromagnetic wave absorption signal, electromagnetic wave signal can only be received from the opening of end face by aerial coil 110, external interference signals so just can be avoided to import radio frequency read-write equipment into by radio-frequency antenna 100, thus reduce the noise of radio frequency read-write equipment, improve its signal to noise ratio and inspection card performance.Please refer to Fig. 2, dotted line in Fig. 2 schematically illustrates the electromagnetic wave signal that aerial coil 130 is launched, because electromagnetic wave signal can only be launched from the opening 151 of end face, the electromagnetic wave signal in all the other directions will be covered, typically with metal layers and absorb or reflection, therefore metal level 150 can control the outer of the electromagnetic wave signal that radio-frequency antenna 100 is launched, this just makes multiple this radio-frequency antenna 100 in time using, and can not produce relevant interference problem and alter and read phenomenon.
Certainly the cavity that this metal level 150 is formed also can be square, cylinder, truncated cone-shaped etc., and the shape, size etc. of metal level 150 are suitably arranged after can considering the characteristic of performance required by radio-frequency antenna 100, aerial coil 110.Signalling channel can by offering opening to be formed on metal level 150, and this opening can form one or more surfaces of shape for metal level 150, also can offer one or more opening on one or more surfaces.This metal level 150 also can form a closed cavity, and form signalling channel by the thickness arranging metal level 150, when the thickness in metal level 150 somewhere is enough thin, electromagnetic wave signal can pass through this place.Certainly this metal level 150 also can be a plane, it is arranged on the side of aerial coil 110, it can shield the electromagnetic wave signal of this side and not affect by the external metallization of this side, electromagnetic wave signal can pass through from other directions, thus makes this radio-frequency antenna 100 have reception and the emission function of the electromagnetic wave signal of specific direction; Certainly can also offer one or more opening on the metal level 150 that this is plane, can make to pass through towards the specific electromagnetic wave signal of this side.
Useful any means forms this metal level 150, can be formed by sheet materials such as iron plate, aluminium sheet, alloy sheets through machining; Also can be woven by metal wires such as aluminum steel, copper cash, alloy wires and form; Also can be attached in nonmetallic materials by the material such as Copper Foil, aluminium foil and be formed, these nonmetallic materials play a protective role in aerial coil 110 and antenna match module 130 can being wrapped in.
Introduce now the parameter of the internal component how regulating antenna match module 130 in detail.Please refer to Fig. 3 now, Fig. 3 is the equivalent circuit diagram that the antenna match module 130 in radio-frequency antenna is formed with transformer matched form, and this specific embodiment is described with the antenna match module being realized impedance matching by transformer matched form.Radio frequency connector RF is connected with the armature winding of Ba Lun conversion transformer T1, radio frequency connector RF is used for the radiofrequency signal of input radio frequency read-write equipment, the non-equilibrium signal that Ba Lun conversion transformer T1 is used for radio frequency read-write equipment exports is converted into balanced signal, to improve the efficiency of power conversion; The secondary winding of Ba Lun conversion transformer T1 is connected with the armature winding of impedance conversion transformer T2; The secondary winding of impedance conversion transformer T2 is parallel with aerial coil 110, matching capacitance C1, adjustable matching capacitance C2 and build-out resistor R1; The turn ratio of impedance conversion transformer T2 can adjust the quality factor of radio-frequency antenna 100; Matching capacitance C1, adjustable matching capacitance C2 and build-out resistor R1, these three devices are for regulating the standing-wave ratio parameter of HF frequency range anti-metal radio-frequency antenna.
Because aerial coil 110 and the relative position of metal level 150 can affect the inductance value size of aerial coil 100, so first fix both relative positions, measure the inductance value L of aerial coil 100, and calculate the size of equivalent capacity and equiva lent impedance; According to LC resonance equation:
Because the operating frequency f of radio-frequency antenna is known, the capacitance C' of equivalent capacity just can be calculated;
According to transformer impedance transformation for mula be:
Because the input impedance of antenna match module 130 is 50 Ω of setting, the no-load voltage ratio n:2 of impedance conversion transformer T2, by N
1=n, N
2=2, Z
1=50 Ω are updated in transformer impedance transformation for mula, can obtain the equiva lent impedance after converting
When known equivalents electric capacity C' and equiva lent impedance R', just can according to connection in series-parallel conversion formula:
R＝(1+Q
2)R′，
Wherein
(Q is the quality factor of radio-frequency antenna, and f is the operating frequency of radio-frequency antenna), calculates the capacitance C=(C1+C2) of matching capacitance and the resistance value R=R1 of build-out resistor.
After calculating the parameter of above each components and parts, just metallic RF antenna can be connected to by radio-frequency (RF) coaxial line in the instrument being similar to standing-wave meter or antenna analyzer, then by the capacitance of the adjustable matching capacitance C2 of fine setting, the standing-wave ratio of radio-frequency antenna 100 is adjusted near 1.0, thus realizes the optimization of radio-frequency antenna 100 parameter.
The form that the antenna match module 130 of certain radio-frequency antenna 100 can also adopt capacitance-resistance to mate realizes, and please refer to Fig. 4, the equivalent circuit diagram in Fig. 4 radio-frequency antenna that to be antenna match module 130 formed with capacitance-resistance matched form.Radio frequency connector RF is in series with two series capacitance C
s, two series capacitance C
sbetween be connected with shunt capacitance C in parallel
p, tunable capacitor C
adj, parallel resistance R
pand aerial coil 110.Those skilled in the art should know, the optimization that regulate radio-frequency antenna 100 parameter similar to the radio-frequency antenna formed with transformer matched form.First can obtain the inductance value of aerial coil 110 by measuring, under the condition of known radio-frequency antenna input impedance and antenna figure of merit, just can calculate series capacitance C
s, shunt capacitance C
pwith parallel resistance R
pparameter, finally by adjustment tunable capacitor C
adjcapacitance realize the optimization of radio-frequency antenna 100 parameter, concrete computational methods no longer describe in detail.It will be appreciated by persons skilled in the art that antenna match module 130 can also realize impedance matching by other forms, this is no longer going to repeat them.
Each technical characteristic of the above embodiment can combine arbitrarily, for making description succinct, the all possible combination of each technical characteristic in above-described embodiment is not all described, but, as long as the combination of these technical characteristics does not exist contradiction, be all considered to be the scope that this specification is recorded.
The above embodiment only have expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but can not therefore be construed as limiting the scope of the patent.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (10)
1. a radio-frequency antenna, comprising in the radio-frequency recognition system of data communication for carrying out in a non contact fashion:
Aerial coil, in order to launch or to receive electromagnetic wave signal;
Antenna match module, is connected with described aerial coil, in order to launch or to receive the signal of telecommunication; It is characterized in that, described radio-frequency antenna also comprises:
Metal level, and the relative position between described aerial coil is fixed, and insulated from each other; Described metal level is in order to shield described aerial coil outwardly electromagnetic signals or receive from the electromagnetic wave signal in the external world, wherein said metal level leaves signalling channel between described aerial coil and the external world, and described aerial coil is launched by described signalling channel or received electromagnetic wave signal.
2. radio-frequency antenna according to claim 1, is characterized in that, described metal level forms the cavity with opening, and described opening is described signalling channel, and described aerial coil is arranged in described cavity.
3. radio-frequency antenna according to claim 2, is characterized in that, the shape of described cavity is cuboid or square, and described opening is any one side of described cuboid or square.
4. radio-frequency antenna according to claim 3, is characterized in that, the plane residing for described aerial coil and the plane parallel residing for described opening.
5. radio-frequency antenna according to claim 1, is characterized in that, described radio-frequency antenna also comprises non-metallic layer, and described non-metallic layer is arranged between described metal level and described aerial coil.
6. radio-frequency antenna according to claim 1, is characterized in that, described aerial coil with a circle above around formation.
7. radio-frequency antenna according to claim 1, is characterized in that, described aerial coil is planar coiled with vortex shape and formed.
8. radio-frequency antenna according to claim 1, is characterized in that, described metal level is formed by sheet metal.
9. radio-frequency antenna according to claim 1, is characterized in that, regulates the parameter of the internal component of described antenna match module according to the relative position of described aerial coil and described metal level.
10. radio-frequency antenna according to claim 1, is characterized in that, described antenna match module is formed with capacitance-resistance matched form or transformer matched form.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510771073.5A CN105428799A (en) | 2015-11-11 | 2015-11-11 | Radio-frequency antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510771073.5A CN105428799A (en) | 2015-11-11 | 2015-11-11 | Radio-frequency antenna |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105428799A true CN105428799A (en) | 2016-03-23 |
Family
ID=55506828
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510771073.5A Pending CN105428799A (en) | 2015-11-11 | 2015-11-11 | Radio-frequency antenna |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105428799A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106501648A (en) * | 2016-11-09 | 2017-03-15 | 苏州纽迈分析仪器股份有限公司 | A kind of improved search coil |
| CN111355033A (en) * | 2018-12-20 | 2020-06-30 | 夏敬懿 | Anti-jamming structure and locking device for installing RF antenna |
| CN111738392A (en) * | 2020-06-11 | 2020-10-02 | 北京智芯微电子科技有限公司 | Anti-metal electronic label and its manufacturing method |
| CN112385763A (en) * | 2019-08-19 | 2021-02-23 | 青岛海尔特种电冰柜有限公司 | Thawing box |
| WO2025252564A1 (en) * | 2024-06-04 | 2025-12-11 | Tkms Hagenuk Marinekommunikation Gmbh | Antenna matching device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102405556A (en) * | 2009-04-21 | 2012-04-04 | 株式会社村田制作所 | Antenna device and method for setting resonance frequency thereof |
| CN104466350A (en) * | 2014-12-05 | 2015-03-25 | 广东欧珀移动通信有限公司 | Mobile terminal |
| CN205194836U (en) * | 2015-11-11 | 2016-04-27 | 威海北洋电气集团股份有限公司 | Radio -frequency antenna |
-
2015
- 2015-11-11 CN CN201510771073.5A patent/CN105428799A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102405556A (en) * | 2009-04-21 | 2012-04-04 | 株式会社村田制作所 | Antenna device and method for setting resonance frequency thereof |
| CN104466350A (en) * | 2014-12-05 | 2015-03-25 | 广东欧珀移动通信有限公司 | Mobile terminal |
| CN205194836U (en) * | 2015-11-11 | 2016-04-27 | 威海北洋电气集团股份有限公司 | Radio -frequency antenna |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106501648A (en) * | 2016-11-09 | 2017-03-15 | 苏州纽迈分析仪器股份有限公司 | A kind of improved search coil |
| CN111355033A (en) * | 2018-12-20 | 2020-06-30 | 夏敬懿 | Anti-jamming structure and locking device for installing RF antenna |
| CN112385763A (en) * | 2019-08-19 | 2021-02-23 | 青岛海尔特种电冰柜有限公司 | Thawing box |
| CN112385763B (en) * | 2019-08-19 | 2024-07-12 | 青岛海尔特种电冰柜有限公司 | Thawing box |
| CN111738392A (en) * | 2020-06-11 | 2020-10-02 | 北京智芯微电子科技有限公司 | Anti-metal electronic label and its manufacturing method |
| CN111738392B (en) * | 2020-06-11 | 2025-01-03 | 北京智芯微电子科技有限公司 | Anti-metal electronic tag and manufacturing method thereof |
| WO2025252564A1 (en) * | 2024-06-04 | 2025-12-11 | Tkms Hagenuk Marinekommunikation Gmbh | Antenna matching device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8400231B2 (en) | High-frequency coupler and communication device | |
| CN105428799A (en) | Radio-frequency antenna | |
| EP2237439B1 (en) | High-frequency coupler | |
| US20110228814A1 (en) | Communication device | |
| KR20220154156A (en) | Wireless power transfer transmitter, system and method for wirelessly transferring power | |
| EP2892127B1 (en) | Electric power transmission device and electric power transmission method | |
| EP2447887A2 (en) | Integrated PCB UHF RFID matching network/antenna | |
| US20170141477A1 (en) | Reflection frequency conversion device using active metamaterial surface and ecm system | |
| US20110222586A1 (en) | High-frequency coupler and communication device | |
| US20120190310A1 (en) | Transceiver and radio frequency identification tag reader | |
| US10447089B2 (en) | Wireless power transfer systems, methods and transmitters therefor | |
| US8334728B2 (en) | High-frequency coupler and communication device | |
| KR101765482B1 (en) | Installation method for attenna apparatus with ntc attenna annd wireless charging coil | |
| EP2490294B1 (en) | Transmission/reception antenna and transmission/reception device using same | |
| KR101358283B1 (en) | Loop antenna having multilayer structure | |
| EP3787192B1 (en) | Quality-factor control for a near-field wireless device | |
| KR101765487B1 (en) | Installation method for attenna apparatus with ntc attenna annd wireless charging coil | |
| US10763921B1 (en) | Near-field electromagnetic induction device | |
| CN205194836U (en) | Radio -frequency antenna | |
| CN110581362A (en) | a coil antenna | |
| US8508342B2 (en) | Transmitting / receiving antenna and transmitter / receiver device using the same | |
| CN104502870A (en) | Planer weak coupling antenna applied to nuclear quadrupole resonance detection system | |
| RU2490761C2 (en) | Double-coil frame antenna in protective housing | |
| US10903573B2 (en) | Antenna with ferromagnetic rods wound and coupled together | |
| US20170093171A1 (en) | Radio frequency filter for wireless power system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20160323 |
|
| RJ01 | Rejection of invention patent application after publication |