CN205960169U - Be applied to in RFID scheme frequency selective surface structure that reinforcing crowd read rate of accuracy - Google Patents
Be applied to in RFID scheme frequency selective surface structure that reinforcing crowd read rate of accuracy Download PDFInfo
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- CN205960169U CN205960169U CN201620893494.5U CN201620893494U CN205960169U CN 205960169 U CN205960169 U CN 205960169U CN 201620893494 U CN201620893494 U CN 201620893494U CN 205960169 U CN205960169 U CN 205960169U
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Abstract
The utility model discloses a be applied to in RFID scheme frequency selective surface structure that reinforcing crowd read rate of accuracy, including resonance elementary layer and medium substrate layer, the resonance elementary layer sets up on the medium substrate layer, the resonance elementary layer includes a plurality ofly along the vertical or horizontal equidistant resonance unit of arranging, the direction of arranging of resonance unit is angle setting in the figure of every resonance unit and the resonance elementary layer. The utility model provides a frequency selective surface structure can be changed and incide this frequency selective surface structure polarization of an electromagnetic wave direction on the surface, can act as shield assembly in being applied to the RFID scheme, control electromagnetic radiation range effectively, in addition, because this frequency selective surface structure has the function of conversion polarised direction, make from this frequency selective surface structure some polarization of an electromagnetic wave directions that reflect back and the polarization of an electromagnetic wave opposite direction that incides, can not offset and read regional former electromagnetic field.
Description
Technical field
The utility model belongs to UHF RFID field, especially relates to one kind and is applied in RFID scheme strengthen group's reading accurately
The frequency-selective surfaces structure of rate.
Background technology
In RFID group's reading scheme, big due to reading label amount, can in scheme application using multiple antennas to penetrating by the way of,
But so can lead to occur misreading the situation of other labels because of the reason read range controls bad.In view of this, meeting
Read using shielding measure in application in RFID group, most shielding measure adopts metal screen because inhaling the high cost of ripple cotton
Cover device.Thing followed problem is, the scattered wave that metal shielding setup produces is to the interference of electromagnetic field of original reading area
Produce skip phenomenon.
Frequency-selective surfaces (frequency selective surface-FSS), referred to as FSS, is a kind of multidimensional
Periodic structure, this selection structure has good selectivity to the transmission of electromagnetic wave and reflection, in its bandpass range, electricity
Magnetic wave can pass through FSS structure, and in the range of its band resistance, electromagnetic wave is then reflected back completely, by periodically
The adjustment of structure, design, can obtain different band logicals and band resistance scope.
From a structural point, FSS structure is a kind of week being formed by different permutation and combination by several FSS units
Phase property structure, if the frequency of electromagnetic wave is identical with the resonant frequency of FSS unit, FSS can assume total transmissivity or total reflection
Characteristic, in general the FSS of patch-type assume total reflection characteristic, the FSS of aperture type assumes total transmissivity characteristic.
Content of the invention
The purpose of this utility model is, in order to overcome deficiency of the prior art, provides one kind to be applied to RFID scheme
The middle frequency-selective surfaces structure strengthening group's reading accuracy rate.
For this reason, the utility model employs the following technical solutions：
A kind of frequency-selective surfaces structure being applied to enhancing group reading accuracy rate in RFID scheme, described frequency-selective surfaces
Structure includes resonant element layer and dielectric substrate layer, and described resonant element layer is arranged in dielectric substrate layer, described resonant element
Layer include multiple along the vertical or horizontal resonant element being equally spaced, in the figure of each resonant element and resonant element layer
The arranged direction of resonant element is in that identical angle is arranged.The arranged direction of resonant element here be multiple resonant elements along
The vertical or horizontal direction being equally spaced.The figure of each resonant element and arrangement in resonant element layer for the resonant element
The angled setting in direction, so can be by a part for the electromagnetic wave inciding in this frequency-selective surfaces structure with opposite polarizations
Direction reflects back, and the part of polarization conversion is to be determined by the angle arranging, for example, by the figure rotation of resonant element
45 °, then the part of this polarization conversion is the half of former electromagnetic wave.The back wave so producing and original polarization of ele direction
Difference, will not offset former electromagnetic field, can increased the possibility that label can read on the contrary.
Preferably, the resonant frequency of described resonant element is identical with rfid system operating frequency.
Preferably, in described resonant element layer, resonant element is setting according to N × M arrangement mode periodicity matrix arrangement
Dielectric substrate layer on.If the dielectric material of dielectric substrate layer is foam, resonant element is to etch by aluminium to set afterwards on a pet film
Put on foam medium substrate layer, so easy to process, cost reduces, lighter in weight.
Preferably, the figure of described resonant element is anchor.
Preferably, the figure of described resonant element and the angle of the arranged direction of resonant element in resonant element layer are 45 °.
Preferably, the size sum of the interval between described resonant element and resonant element is reader in RFID scheme
The integral multiple of antenna launched electromagnetic wave half-wavelength in dielectric substrate layer.
Preferably, the thickness of described dielectric substrate layer is launched electromagnetic wave in medium by reader antenna in RFID scheme
The wavelength of a quarter in substrate layer.
Preferably, described dielectric substrate is arranged on the metal layer.
Said frequencies selection surface texture is arranged in the opposite side of reader antenna, concrete range reader antenna
Antimetropia concrete scheme is determined, the quantity of the resonant element of whole frequency-selective surfaces structure is determined depending on concrete scheme.
The utility model provides a kind of frequency-selective surfaces structure being applied to enhancing group reading accuracy rate in RFID scheme,
It is exactly spatial filter structure and polarization of ele converter structure.Frequency-selective surfaces structure provided by the utility model can
To change the polarization of electromagnetic wave direction incided on this frequency-selective surfaces body structure surface, permissible in being applied to RFID scheme
Serve as screening arrangement, efficiently control the radiation scope of electromagnetic wave, additionally, because this frequency-selective surfaces structure has conversion
The function of polarised direction so that the part polarization of electromagnetic wave direction that reflected back from this frequency-selective surfaces structure with incident
Polarization of electromagnetic wave is in opposite direction, will not offset the former electromagnetic field of reading area, on the contrary, because existing multiple in reading area
The electromagnetic wave of polarised direction, thus increased the electromagnetic wave of multiple polarised directions, increased the possibility that label is read.
Brief description
Fig. 1 is a kind of frequency selection table being applied to enhancing group reading accuracy rate in RFID scheme provided by the utility model
The schematic cross-sectional view of face structure；
Fig. 2 is a kind of frequency selection table being applied to enhancing group reading accuracy rate in RFID scheme provided by the utility model
The structural representation of resonant element in the structure of face；
Fig. 3 is a kind of frequency selection table being applied to enhancing group reading accuracy rate in RFID scheme provided by the utility model
The arrangement schematic diagram of face structure；
Fig. 4 is a kind of frequency selection table being applied to enhancing group reading accuracy rate in RFID scheme provided by the utility model
The simulation result figure of face structure；
In figure：1- resonant element layer；2- dielectric substrate layer；3- metal level.
Specific embodiment
With specific embodiment, the utility model is described in more detail referring to the drawings.
As shown in figure 1,1 is resonant element layer, 2 is dielectric substrate layer, and 3 is metal level.Medium material in dielectric substrate layer 2
Material is configured according to the demand of concrete scheme, and the thickness of dielectric substrate layer is launched electricity by reader antenna in RFID scheme
The wavelength of magnetic wave a quarter in dielectric substrate layer.Metal level 3 is configured according to the demand of concrete scheme.
As shown in Fig. 2 Fig. 2 be provided by the utility model a kind of be applied in RFID scheme strengthen group read accuracy rate
The structural representation of resonant element in frequency-selective surfaces structure, in Fig. 2, anchor is the figure of resonant element.In the present embodiment
In, the cycle a=70 mm of resonant element, it is designed for foam according to dielectric material, if dielectric material selects other
Material, can carry out redesigning adjustment.
In conjunction with shown in Fig. 2 and Fig. 3, the figure of each resonant element with the arranged direction of resonant element in resonant element layer is in
Angle is arranged.The arranged direction of resonant element here is multiple resonant elements along the vertical or horizontal side being equally spaced
To.In the present embodiment, this angle is 45 °.
As shown in figure 4, Fig. 4 be provided by the utility model a kind of be applied in RFID scheme strengthen group read accuracy rate
The simulation result figure of frequency-selective surfaces structure.When carrying between a width of 900 MHz ~ 960 MHz, in this bandwidth, stopband characteristic is relatively
Good.
Above-mentioned specific embodiment is used for illustrating the utility model, preferred embodiment only of the present utility model, and
It is not that the utility model is limited, in spirit of the present utility model and scope of the claims, new to this practicality
Any modification, equivalent substitution and improvement that type is made etc., fall within protection domain of the present utility model.
Claims (7)
1. a kind of be applied in RFID scheme to strengthen group read the frequency-selective surfaces structure of accuracy rate it is characterised in that described frequency
Rate selects surface texture to include resonant element layer and dielectric substrate layer, and described resonant element layer is arranged in dielectric substrate layer, institute
State resonant element layer include multiple along the vertical or horizontal resonant element being equally spaced, the figure of each resonant element with humorous
The arranged direction of resonant element in elementary layer of shaking is in that identical angle is arranged.
2. being applied to according to claim 1 strengthens, in RFID scheme, the frequency-selective surfaces structure that group reads accuracy rate,
It is characterized in that, in described resonant element layer, resonant element is according to N × M arrangement mode periodicity matrix arrangement.
3. being applied to according to claim 1 strengthens, in RFID scheme, the frequency-selective surfaces structure that group reads accuracy rate,
It is characterized in that, the figure of described resonant element is anchor.
4. being applied to according to claim 1 strengthens, in RFID scheme, the frequency-selective surfaces structure that group reads accuracy rate,
It is characterized in that, the figure of described resonant element is 45 ° with the angle of the arranged direction of resonant element in resonant element layer.
5. being applied to according to claim 1 strengthens, in RFID scheme, the frequency-selective surfaces structure that group reads accuracy rate,
It is characterized in that, the size sum of the interval between described resonant element and resonant element is reader antenna in RFID scheme
The integral multiple of launched electromagnetic wave half-wavelength in dielectric substrate layer.
6. being applied to according to claim 1 strengthens, in RFID scheme, the frequency-selective surfaces structure that group reads accuracy rate,
It is characterized in that, the thickness of described dielectric substrate layer is launched electromagnetic wave in dielectric substrate by reader antenna in RFID scheme
The wavelength of a quarter in layer.
7. being applied to according to any one in claim 1-6 strengthens the frequency selection that group reads accuracy rate in RFID scheme
Surface texture is it is characterised in that described dielectric substrate is arranged on the metal layer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620893494.5U CN205960169U (en) | 2016-08-16 | 2016-08-16 | Be applied to in RFID scheme frequency selective surface structure that reinforcing crowd read rate of accuracy |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108682969A (en) * | 2018-03-16 | 2018-10-19 | 南京理工大学 | A kind of anti-metal RFID tag of passive chipless |
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2016
- 2016-08-16 CN CN201620893494.5U patent/CN205960169U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108682969A (en) * | 2018-03-16 | 2018-10-19 | 南京理工大学 | A kind of anti-metal RFID tag of passive chipless |
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