CN104409844A - Near field communication antenna device based on depth subwavelength open resonator - Google Patents
Near field communication antenna device based on depth subwavelength open resonator Download PDFInfo
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- CN104409844A CN104409844A CN201410739942.1A CN201410739942A CN104409844A CN 104409844 A CN104409844 A CN 104409844A CN 201410739942 A CN201410739942 A CN 201410739942A CN 104409844 A CN104409844 A CN 104409844A
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- open resonator
- microstrip line
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Abstract
The invention discloses a near field communication antenna device based on a depth subwavelength open resonator. The near field communication antenna device comprises a metal layer, a first substrate layer, a microstrip line, a second substrate layer and the depth subwavelength open resonator which are vertically arranged, wherein the metal layer covers the bottom surface of the first substrate; the depth subwavelength open resonator covers the second substrate layer above the microstrip line; one end of the microstrip line is used as an input port of the near field communication antenna; the other end of the microstrip line penetrates through the first substrate layer through a metallic via hole and is connected with the metal layer; antenna impedance is adjusted by adjusting the length of the microstrip, and the impedance matching is realized. According to the near field communication antenna device disclosed by the invention, based on the depth subwavelength open resonator, wireless communication is realized by adopting a near-field magnetic field coupling mode, so that communication distance can be effectively limited, and the disturbance of the ambient environment on an electromagnetic field is reduced, and further the safety and the reliability of radio frequency identification communication are improved.
Description
Technical field
The present invention relates to a kind of communication antenna arrangement, especially relate to a kind of near field communication antenna device based on degree of depth sub-wavelength open resonator.
Background technology
Traditional UHF RFID radio frequency identification communication system mainly emphasizes that having tag recognition far away reads distance, to meet, highway ETC charges, cargo container is made an inventory etc., and application scenario distinguishes the needs of label at a distance, but in the occasion had higher requirements to fail safe as gate control system, mobile payment etc. need the communication of reader and label to be limited in less scope to prevent the intercepting and capturing of information or surprisingly to read.Current existing technical method mainly adopts the communication distance regulating the mode of reader transmitting power to come regulating and controlling reader and label and the width adopting directional antenna to control electromagnetic beam to carry out limiting telecommunication scope, but the communication antenna due to reader and label adopts the communication mode of electromagnetic wave far field coupling, add the complexity of electromagnetic transmission environment, the area of space that can cover that communicates still is difficult to effectively be limited, in addition the direct control to label identifiable design reading property is not possessed yet, thus the transmission of information in radio frequency is is still easily intercepted and captured or unexpected reading, and antenna is also easily subject to the disturbance of surrounding environment to the specular scattering of far field electromagnetic wave traveling, thus the safety of radio-frequency (RF) identification communication is had influence on reliable.
Summary of the invention
Effectively can not limit communication distance and easily be coupled to be disturbed with external environment thus affect the shortcoming of communications security and reliability for overcoming current UHF RFID antenna, the object of the present invention is to provide a kind of near field communication antenna device based on degree of depth sub-wavelength open resonator, the effective restriction to communication distance can be realized, and the disturbance of surrounding environment to electromagnetic field can be reduced, thus improve the safety and reliability of UHF RFID communication.
The technical solution used in the present invention is as follows:
The present invention includes upper and lower metal level, first substrate layer, microstrip line, second substrate layer and degree of depth sub-wavelength open resonator of arranging successively, metal level covers first substrate layer bottom surface, degree of depth sub-wavelength open resonator covers on the second substrate layer directly over microstrip line, one end of microstrip line is as the input port of near-field communication aerial, the other end of microstrip line is connected with metal level through first substrate layer by metallized via hole, by adjusting the length adjustment antenna impedance of microstrip line, realize impedance matching.
Described degree of depth sub-wavelength open resonator includes inner ring and outer shroud.
Described first substrate layer or second substrate layer adopt pcb board.
Described microstrip line is etched by metal and is formed on first substrate layer.
One end of described microstrip line is connected with RF connector as input port.
Described degree of depth sub-wavelength open resonator is metal openings resonant ring (SRR).
Described device is applicable to the communication of UHF RFID near field.
The beneficial effect that the present invention has is:
The present invention is based on degree of depth sub-wavelength open resonator, adopt magnetic field, near field coupled modes to carry out radio communication, can effective limiting telecommunication distance reduce the disturbance of surrounding environment to electromagnetic field, thus improve the safety and reliability that radio-frequency (RF) identification communicates.
The present invention to interact the disturbance produced to reduce far field electromagnetic ripple and surrounding environment scattered reflection by adopting high q-factor degree of depth sub-wavelength open resonator to realize magnetic field, near field coupled communication, adopt the broadside coupled excitation of microstrip line to realize high-intensity magnetic field coupling, and adopt microstrip line short circuit branch realize the input resistant matching of antenna with less size thus improve communication signal strength, near-field communication aerial adopts the design of degree of depth sub-wavelength open resonator, thus within the scope of controlled distance, realize safe and reliable UHF RFID radio frequency near-field communication.
Accompanying drawing explanation
Fig. 1 is the reception schematic diagram of inventive antenna device.
Fig. 2 is each Rotating fields schematic diagram of the present invention.
Fig. 3 is the end view of Fig. 2.
Fig. 4 is the vertical view of Fig. 2.
Fig. 5 is the equivalent circuit diagram of inventive antenna device.
In figure: 1, antenna assembly, 2, receiver, 1.1, metal level, 1.2, first substrate layer, 1.3, microstrip line, 1.4, second substrate layer, 1.5, degree of depth sub-wavelength open resonator.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present invention is further illustrated.
As shown in Figures 2 and 3, the present invention includes, under the metal level 1.1 of arranging successively, first substrate layer 1.2, microstrip line 1.3, second substrate layer 1.4 and degree of depth sub-wavelength open resonator 1.5, metal level 1.1 covers first substrate layer 1.2 bottom surface, as shown in Figure 4, degree of depth sub-wavelength open resonator 1.5 covers second substrate layer 1.4 center directly over microstrip line 1.3, one end of microstrip line 1.3 is as the input port of near-field communication aerial, the other end of microstrip line 1.3 is connected with metal level 1.1 through first substrate layer 1.2 by metallized via hole, by adjusting the length adjustment antenna impedance of microstrip line 1.3, realize impedance matching, be applicable to the communication of UHF RFID near field.
As shown in Figure 1, the present invention is coaxial with receiver 2 at antenna assembly 1, and when adopting the coupled modes communication of magnetic field, near field, magnetic field resonance obtains close coupling with effective transmit communications signals.When receiver 2 spaces out with the antenna of near-field communication aerial, electromagnetic field cannot effectively be coupled by resonance, institute's transmit communications signals rapid decay, thus the recognition distance range of restriction radio-frequency (RF) identification is to prevent information from being intercepted and captured or unexpected reading, thus improve the fail safe of radio-frequency (RF) identification communication, in addition because antenna energy mainly exists with near field form, far field radiated power is more weak, thus communication electromagnetism field and surrounding environment are weak coupling relation, thus be also not easy to be subject to the electromagnetic disturbance of extraneous specular scattering, improve the reliability of radio-frequency (RF) identification communication.
As shown in Figure 4, preferably, degree of depth sub-wavelength open resonator 1.5 adopts metal openings resonant ring SRR, includes inner ring and outer shroud.
First substrate layer 1.2 or second substrate layer 1.4 adopt pcb board.
Microstrip line 1.3 is etched by metal and is formed on first substrate layer 1.2.
One end of microstrip line 1.3 is connected with RF connector as input port.
The present invention always has five layers:
Ground floor is the reference horizontal plane of manufacturing that the metal level 1.1 being positioned at bottom is used as antenna.
The second layer is the first substrate layer 1.2 adopting dielectric material, and its thickness can affect the impedance resonance characteristic of microstrip line 1.3 and degree of depth sub-wavelength open resonator 1.5, is in optimized selection by electromagnetic-field simulation.
The microstrip line 1.3 of third layer for being formed after etching metal, one end of microstrip line 1.3 is connected with RF connector as input port, and the other end of microstrip line 1.3 is connected to be grounded with metal level 1.1 by metallized via hole.By adjusting the length of microstrip line 1.3, i.e. the length of microstrip line short circuit branch, realizes impedance matching to regulate the input impedance of antenna.
The 4th layer of second substrate layer 1.4 for employing dielectric material, its thickness can affect the impedance resonance characteristic of microstrip line 1.3 and degree of depth sub-wavelength open resonator 1.5, is in optimized selection by electromagnetic-field simulation;
The degree of depth sub-wavelength open resonator 1.5 of layer 5 for being formed after etching metal, metal openings resonant ring SRR can be adopted, include inner ring and outer shroud, the relating to parameters such as gap, the length of side, width of its resonance frequency and impedance operator and inner ring outer shroud, carry out optimization of parameter choice by electromagnetic-field simulation, antenna impedance is mated with the antenna port impedance of near-field communication aerial at resonance frequency place.
The present invention realizes magnetic field, near field coupled communication by adopting degree of depth sub-wavelength open resonator, to interact the disturbance produced to reduce far field electromagnetic ripple and surrounding environment scattered reflection, adopt microstrip lines excitation to realize high-intensity magnetic field coupling, and adopt microstrip line short circuit branch realize the input resistant matching of antenna with less size thus improve communication signal strength, adopt the design of degree of depth sub-wavelength open resonator, thus within the scope of controlled distance, realize safe and reliable UHF RFID radio frequency near-field communication.
As shown in Figure 5, the equivalent electric circuit of inventive antenna, for SRR, the input impedance Z of antenna
iNcan be expressed as:
Z
IN＝1/[1/(1/jωC
g+Z
SRR)+1/X
L]
In formula, C
gfor the coupling capacitance of microstrip line and SRR, Z
sRRfor the equiva lent impedance of SRR, Z can be expressed as
sRR=R
sRR+ j ω L
sRR+ 1/j ω C
sRR, X
lbe the equiva lent impedance of microstrip line short circuit branch, j represents imaginary number, and ω represents resonance frequency, C
sRRrepresent the equivalent capacity of SRR, L
sRRrepresent the equivalent inductance of SRR, R
sRRrepresent the equivalent resistance of SRR.C can be changed by regulating the distance of microstrip line and SRR
gsize, can regulate X by regulating microstrip line short circuit branch length
lsize, thus regulate the input impedance of antenna to equal the characteristic impedance Z of microstrip line
cto realize impedance matching, antenna feed impedance presents capacitive when not comprising microstrip line short circuit branch at SRR resonance frequency place, therefore adopting microstrip line short circuit branch thus carrying out induction reactance with less size to antenna feed impedance compensates tuning, and by selecting suitable SRR dimensional parameters, the resonance frequency of SRR can be adjusted to the operating frequency of antenna to realize maximum antenna communication magnetic field excitation.
Embodiments of the invention:
As shown in Figure 1 and Figure 4, degree of depth sub-wavelength open resonator in embodiment adopts split ring resonator (SRR), first substrate layer and second substrate layer adopt the substrate of Rogers 4350B, length and width are 60mm, thickness is 0.762mm, the dielectric constant of substrate is 3.48, and loss is 0.0037; The thickness of metal level, microstrip line and SRR is 0.0018mm, and the length of microstrip line is 48.5mm, and width is 1.74mm, and characteristic impedance is 50 ohm, and the length of side of SRR is 14mm, and the width of inner ring and outer shroud is 1mm, and the spacing of inner ring and outer shroud is 1mm.The resonance frequency of above-mentioned near-field communication aerial is 1.773GHz, Q value is 395, and thus, the present invention can meet the requirement realizing safe and reliable UHF RFID radio frequency near-field communication within the scope of controlled distance, realizes UHF RFID radio frequency near-field communication.
Above-mentioned embodiment is used for explaining and the present invention is described, instead of limits the invention, and in the protection range of spirit of the present invention and claim, any amendment make the present invention and change, all fall into protection scope of the present invention.
Claims (7)
1. the near field communication antenna device based on degree of depth sub-wavelength open resonator, it is characterized in that: comprise, under the metal level (1.1) of arranging successively, first substrate layer (1.2), microstrip line (1.3), second substrate layer (1.4) and degree of depth sub-wavelength open resonator (1.5), metal level (1.1) covers first substrate layer (1.2) bottom surface, degree of depth sub-wavelength open resonator (1.5) covers on the second substrate layer (1.4) directly over microstrip line (1.3), one end of microstrip line (1.3) is as the input port of near-field communication aerial, the other end of microstrip line (1.3) is connected with metal level (1.1) through first substrate layer (1.2) by metallized via hole, by the length adjustment antenna impedance of adjustment microstrip line (1.3), realize impedance matching.
2. a kind of near field communication antenna device based on degree of depth sub-wavelength open resonator according to claim 1, is characterized in that: described degree of depth sub-wavelength open resonator (1.5) includes inner ring and outer shroud.
3. a kind of near field communication antenna device based on degree of depth sub-wavelength open resonator according to claim 1, is characterized in that: described first substrate layer (1.2) or second substrate layer (1.4) adopt pcb board.
4. a kind of near field communication antenna device based on degree of depth sub-wavelength open resonator according to claim 1, is characterized in that: described microstrip line (1.3) is etched by metal and formed on first substrate layer (1.2).
5. a kind of near field communication antenna device based on degree of depth sub-wavelength open resonator according to claim 1, is characterized in that: one end of described microstrip line (1.3) is connected with RF connector as input port.
6. a kind of near field communication antenna device based on degree of depth sub-wavelength open resonator according to claims 1 or 2, is characterized in that: described degree of depth sub-wavelength open resonator (1.5) is metal openings resonant ring.
7., according to the arbitrary described a kind of near field communication antenna device based on degree of depth sub-wavelength open resonator of claim 1 ~ 5, it is characterized in that: described device is applicable to the communication of UHF RFID near field.
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| CN201410739942.1A CN104409844A (en) | 2014-12-05 | 2014-12-05 | Near field communication antenna device based on depth subwavelength open resonator |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107799884A (en) * | 2017-09-05 | 2018-03-13 | 西安电子科技大学 | Two-dimensional sub-wavelength array antenna and the Wireless Telecom Equipment of application, radar terminal |
| CN112563737A (en) * | 2020-11-02 | 2021-03-26 | 中山大学 | Dual-frequency antenna comprising periodic leaky-wave structure and manufacturing method thereof |
| CN114883771A (en) * | 2022-05-26 | 2022-08-09 | 东南大学 | On-chip passive quadrilateral open-ended coupled resonator based on artificial surface plasmon |
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| CN101316008A (en) * | 2008-06-13 | 2008-12-03 | 哈尔滨工业大学 | MIMO mobile terminal multi-antenna with high isolation and low correlated characteristic |
| CN102394359A (en) * | 2011-06-21 | 2012-03-28 | 中国兵器工业第二○六研究所 | Multilayer micro-strip flat-plate array antenna with symmetric beams |
| CN102811325A (en) * | 2011-06-30 | 2012-12-05 | 深圳光启高等理工研究院 | On-vehicle China multimedia broadcasting (CMMB) terminal |
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2014
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Patent Citations (3)
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| CN101316008A (en) * | 2008-06-13 | 2008-12-03 | 哈尔滨工业大学 | MIMO mobile terminal multi-antenna with high isolation and low correlated characteristic |
| CN102394359A (en) * | 2011-06-21 | 2012-03-28 | 中国兵器工业第二○六研究所 | Multilayer micro-strip flat-plate array antenna with symmetric beams |
| CN102811325A (en) * | 2011-06-30 | 2012-12-05 | 深圳光启高等理工研究院 | On-vehicle China multimedia broadcasting (CMMB) terminal |
Non-Patent Citations (1)
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| JIAN-WEN CAO等: "《A compact near field UHF RFID reader antenna using SRR》", 《PROCEEDINGS OF THE 2011 INTERNATIONAL CONFERENCE ON MACHINE LEARNING AND CYBERNETICS ,GUILIN》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107799884A (en) * | 2017-09-05 | 2018-03-13 | 西安电子科技大学 | Two-dimensional sub-wavelength array antenna and the Wireless Telecom Equipment of application, radar terminal |
| CN112563737A (en) * | 2020-11-02 | 2021-03-26 | 中山大学 | Dual-frequency antenna comprising periodic leaky-wave structure and manufacturing method thereof |
| CN114883771A (en) * | 2022-05-26 | 2022-08-09 | 东南大学 | On-chip passive quadrilateral open-ended coupled resonator based on artificial surface plasmon |
| CN114883771B (en) * | 2022-05-26 | 2024-02-02 | 东南大学 | On-chip passive quadrilateral split coupling resonator based on artificial surface plasmon |
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