CN105529520A - Ultra-wideband circular polarized anti-metallic RFID tag antenna prone to impedance regulation - Google Patents
Ultra-wideband circular polarized anti-metallic RFID tag antenna prone to impedance regulation Download PDFInfo
- Publication number
- CN105529520A CN105529520A CN201610064020.4A CN201610064020A CN105529520A CN 105529520 A CN105529520 A CN 105529520A CN 201610064020 A CN201610064020 A CN 201610064020A CN 105529520 A CN105529520 A CN 105529520A
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- radiation patch
- label antenna
- easy
- semi
- impedance adjustment
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- 239000002184 metal Substances 0.000 claims abstract description 56
- 229910052751 metal Inorganic materials 0.000 claims abstract description 56
- 230000005855 radiation Effects 0.000 claims abstract description 44
- 239000000758 substrate Substances 0.000 claims abstract description 26
- 230000010287 polarization Effects 0.000 claims description 24
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 210000003141 lower extremity Anatomy 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 3
- 230000006854 communication Effects 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000002372 labelling Methods 0.000 description 1
Classifications
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- 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
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/08—Radiating ends of two-conductor microwave transmission lines, e.g. of coaxial lines, of microstrip lines
- H01Q13/085—Slot-line radiating ends
Abstract
The invention discloses an ultra-wideband circular polarized anti-metallic RFID tag antenna prone to impedance regulation. The ultra-wideband circular polarized anti-metallic RFID tag antenna comprises a radiation patch, a dielectric substrate, a ground metal patch and a tag chip, wherein the radiation patch is arranged on the upper surface of the dielectric substrate; the ground metal patch is arranged on the lower surface of the dielectric substrate; a semicircular groove is formed in the upper part of the radiation patch; a semicircular microstrip feeder and a rectangular microstrip feeder are embedded into the semicircular groove; the rectangular microstrip feeder is connected with the semicircular microstrip feeder; the tag chip is welded on the semicircular microstrip feeder; an L-shaped groove is formed in the middle part of the radiation patch; and a short-circuit via hole which is communicated with the upper layer of the radiation patch and the lower part of the ground metal patch is formed in the lower part of the radiation patch. The tag antenna disclosed by the invention covers global ultrahigh frequency RFID application bands; 3dB axis ratio bandwidth is relatively high; and stable performance can be kept in a relatively complicated environment.
Description
Technical field
The present invention relates to a kind of RFID label antenna, especially a kind of ultra broadband circular polarization anti-metal is easy to the RFID label antenna of impedance adjustment, belongs to RFID antenna technical field.
Background technology
Radio-frequency (RF) identification (RadioFrequencyIdentification, RFID) technology, also known as radio frequency identification.It is a kind of contactless automatic identification technology utilizing electromagnetic wave to realize.Rfid system is made up of reader, label and antenna.In rfid system, electronic tag captures the radio frequency energy emitted from reader antenna by label antenna, and be used for activating label chip work, then receive the data message stored by chip being transmitted to reader antenna by label antenna.In whole radio-frequency (RF) identification communication process, label antenna has very important effect.
In the field such as retail business, logistics, it is more and more extensive that super high frequency radio frequency identification (UHF-RFID) technology is applied.For the frequency range that ultrahigh frequency RFID uses, there is different frequency range approval standards in different countries, 840MHz-845MHz and 920MHz-925MHz that such as China adopts, and the frequency range of North America is 902MHz-928MHz.Therefore, designing ultrahigh frequency RFID covering the whole world uses the ultra broadband label antenna of frequency range (840MHz-960MHz) to have very important significance.
In present market, the reader antenna of circular polarization that what most rfid system adopted is, but when the antenna of label use linear polarization, in communication process, just there will be very large polarization mismatch, thus greatly reducing reading distance.Even when reader antenna is also when using linear polarization, the position of the label antenna placement of linear polarization misplaces a little and just there will be polarization mismatch completely, thus can not communicate.
In many actual application environment, labeling requirement attachment on the metal surface.Due to the electromagnetic reflection of metal pair, when label antenna presses close to metal, the change that the impedance matching of antenna, radiation efficiency, directivity all occur, the reading distance of label reduces greatly.Therefore design the label antenna of an anti-metal be on market in the urgent need to.
The RFID label chip that present market is applied is all the character presenting the capacitive reactance of Low ESR height, realize impedance matching, realizes maximum through-put power, and label antenna must be designed to the reactance of Low ESR high induction reactance.Because different label chip has different resistance values, therefore design the label antenna being easy to impedance adjustment and be necessary very much.
Summary of the invention
The object of the invention is the defect in order to solve above-mentioned prior art, provide the RFID label antenna that a kind of ultra broadband circular polarization anti-metal is easy to impedance adjustment, this label antenna has ultra broadband, circular polarization, anti-metal, is easy to the advantage of impedance adjustment, and covering worldwide ultrahigh frequency RFID application band, 3dB axial ratio bandwidth is wider.
Object of the present invention can reach by taking following technical scheme:
Ultra broadband circular polarization anti-metal is easy to the RFID label antenna of impedance adjustment, comprise radiation patch, medium substrate, grounded metal paster and label chip, described radiation patch is arranged on the upper surface of medium substrate, and described grounded metal paster is arranged on the lower surface of medium substrate; The top of described radiation patch has a semi-circular groove, and the inside of described semi-circular groove embeds a semi-circular shape microstrip feed line and a rectangular microstrip feeder line be connected with semi-circular shape microstrip feed line, and described label chip is welded on semi-circular shape microstrip feed line; The middle part of described radiation patch has a L shape groove, and the bottom of radiation patch arranges the short circuit via hole that is communicated with radiation patch upper strata and grounded metal paster lower floor.
As a kind of preferred version, described radiation patch, grounded metal paster and short circuit via hole all adopt copper product to make, and described medium substrate adopts FR4 medium substrate.
As a kind of preferred version, the model of described label chip is the Monza4 of Impinj company, and this label chip has the input impedance of 11-j143 Ω and the threshold power of-17.4dBm when operating frequency is 915MHz.
As a kind of preferred version, described radiation patch is of a size of 58mm × 58mm.
As a kind of preferred version, the planar dimension of described medium substrate and the measure-alike of grounded metal paster, be 68mm × 68mm, and the thickness of medium substrate is 1.6mm.
As a kind of preferred version, the radius of described semi-circular groove is 25mm.
As a kind of preferred version, the annulus outer radius of described semi-circular shape microstrip feed line is 22.36mm, and inside radius is 20.39mm; The length of described rectangular microstrip feeder line is 17.3mm, and width is 2.6mm.
As a kind of preferred version, the lower surface of described label chip is foursquare microstrip feed line connecting line, and the length of this microstrip feed line connecting line is 2mm.
As a kind of preferred version, the large rectangle length of described L shape groove is 29.5mm, and little rectangle length is 7mm, and the width of large rectangle and little rectangle is 3mm.
As a kind of preferred version, the distance between the center of described short circuit via hole and the lower limb of radiation patch is 4mm, and radius is 1mm.
The present invention has following beneficial effect relative to prior art:
1, label antenna of the present invention has a semi-circular groove on the top of radiation patch, and a semi-circular shape microstrip feed line and a rectangular microstrip feeder line is embedded in the inside of this semi-circular groove, by changing the length of rectangular microstrip feeder line, the impedance of label antenna can be regulated, make it and the label chip matches impedances used; Have a L shape groove at the middle part of radiation patch, better circular polarization pattern can be inspired by L shape groove; A short circuit via hole is set in the bottom of radiation patch, is communicated with radiation patch upper strata and grounded metal paster lower floor by short circuit via hole, realizes the function of grounded metal paster as a part for label antenna, to reach the object of anti-metal.
2, label antenna of the present invention adopts microstrip lines feeding classification, by short circuit via hole using the part of grounded metal paster as label antenna, when working in metal surface, performance not only can not have an impact, and due to metal ground increase can produce larger gain, add reading distance on the contrary.
3, label antenna of the present invention shows through test,-10dB return loss bandwidth ultrahigh frequency RFID system covering the whole world frequency range, the axial ratio bandwidth of 3dB also completely covers the 920MHz-925MHz frequency range of US bands and China, therefore, it is possible to keep stable performance in complex environment more.
Accompanying drawing explanation
Fig. 1 is label antenna plan structure figure of the present invention.
Fig. 2 is label antenna side-looking structure chart of the present invention.
Fig. 3 is label antenna input reactance figure of the present invention.
Fig. 4 is label antenna input resistance figure of the present invention.
Fig. 5 is the resolution chart of label antenna reflection coefficient of power of the present invention.
Fig. 6 is label antenna axial ratio bandwidth figure of the present invention.
Fig. 7 is the gain diagram that label antenna of the present invention is placed in the metal surface of different size.
Wherein, 1-radiation patch, 2-medium substrate, 3-grounded metal paster, 4-label chip, 5-semi-circular groove, 6-semi-circular shape microstrip feed line, 7-rectangular microstrip feeder line, 8-L shape groove, 9-short circuit via hole.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment 1:
As depicted in figs. 1 and 2, the label antenna of the present embodiment comprises radiation patch 1, medium substrate 2, grounded metal paster 3 and label chip 4, described radiation patch 1 is arranged on the upper surface of medium substrate 2, described grounded metal paster 3 is arranged on the lower surface of medium substrate 2, as metal ground, namely radiation patch 1 is on upper strata, and medium substrate 2 is in intermediate layer, and grounded metal paster 3 is in lower floor;
The top of described radiation patch 1 has a semi-circular groove 5, the inside of described semi-circular groove 5 embeds a semi-circular shape microstrip feed line 6 and a rectangular microstrip feeder line 7 be connected with semi-circular shape microstrip feed line 6, couple feed can be carried out to radiation patch 1 by semi-circular shape microstrip feed line 6 and rectangular microstrip feeder line 7, by changing the length of rectangular microstrip feeder line 7, the impedance of label antenna can be regulated;
Described label chip 4 is welded on semi-circular shape microstrip feed line 6, and the model of this label chip 4 is the Monza4 of Impinj company, and the chip of this model has the input impedance of 11-j143 Ω and the threshold power of-17.4dBm when operating frequency is 915MHz;
The middle part of described radiation patch 1 has a L shape groove 8, better circular polarization pattern can be inspired by L shape groove 8, and the bottom of radiation patch 1 arranges the short circuit via hole 9 that is communicated with radiation patch 1 upper strata and grounded metal paster 3 lower floor, by short circuit via hole 9 using the part of grounded metal paster 3 as label antenna, to reach the object of anti-metal, when label antenna works in metal surface, performance not only can not have an impact, and larger gain can be produced due to the increase of grounded metal paster 3, add reading distance on the contrary;
In the present embodiment, described radiation patch 1, grounded metal paster 3 and short circuit via hole 9 all adopt copper product to make, and described medium substrate 2 adopts FR4 medium substrate; Described radiation patch 1 is of a size of 58mm × 58mm, and the planar dimension of described medium substrate 2 and the measure-alike of grounded metal paster 3, be 68mm × 68mm, and the thickness of medium substrate 2 is 1.6mm; The radius of described semi-circular groove 5 is 25mm, the annulus outer radius of described semi-circular shape microstrip feed line 6 is 22.36mm, inside radius is 20.39mm, the length of described rectangular microstrip feeder line 7 is 17.3mm, width is 2.6mm, the lower surface of described label chip 4 is foursquare microstrip feed line connecting line, and the length of this microstrip feed line connecting line is 2mm; The large rectangle length of described L shape groove 8 is 29.5mm, and little rectangle length is 7mm, and the width of large rectangle and little rectangle is 3mm; Distance between the center of described short circuit via hole 9 and the lower limb of radiation patch 1 is 4mm, and radius is 1mm.
From foregoing, the impedance adjustment of label antenna controls mainly through the length of rectangular microstrip feeder line 7; As shown in Figure 3 and Figure 4, when the length of rectangular microstrip feeder line 7 increases, input reactance and the resistance of label antenna all increase; Further, when the length of rectangular microstrip feeder line 7 is 17.3mm, best with used label chip 4 impedance matching.
The reflection coefficient of power test curve of the label antenna of the present embodiment as shown in Figure 5, as we can see from the figure ,-10dB bandwidth ultrahigh frequency RFID system covering the whole world frequency range.
As shown in Figure 6, as we can see from the figure, the axial ratio bandwidth of 3dB also completely covers the 920MHz-925MHz frequency range of US bands and China to the label antenna axial ratio bandwidth curve of the present embodiment.
The label antenna of the present embodiment is placed in the gain contrast of the metal surface of different size as shown in Figure 7, along with the increase of metallic area, the gain of label antenna is also along with increase, tend towards stability when metallic area is greater than 200mm × 200mm, when the label antenna of visible the present embodiment works in metal surface, there is farther reading distance.
In sum, label antenna of the present invention has a semi-circular groove on the top of radiation patch, and a semi-circular shape microstrip feed line and a rectangular microstrip feeder line is embedded in the inside of this semi-circular groove, by changing the length of rectangular microstrip feeder line, the impedance of label antenna can be regulated, make it and the label chip matches impedances used; Have a L shape groove at the middle part of radiation patch, better circular polarization pattern can be inspired by L shape groove; A short circuit via hole is set in the bottom of radiation patch, is communicated with radiation patch upper strata and grounded metal paster lower floor by short circuit via hole, realizes the function of grounded metal paster as a part for label antenna, to reach the object of anti-metal.
The above; be only patent preferred embodiment of the present invention; but the protection range of patent of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the scope disclosed in patent of the present invention; be equal to according to the technical scheme of patent of the present invention and inventive concept thereof and replace or change, all belonged to the protection range of patent of the present invention.
Claims (10)
1. ultra broadband circular polarization anti-metal is easy to the RFID label antenna of impedance adjustment, it is characterized in that: comprise radiation patch, medium substrate, grounded metal paster and label chip, described radiation patch is arranged on the upper surface of medium substrate, and described grounded metal paster is arranged on the lower surface of medium substrate; The top of described radiation patch has a semi-circular groove, and the inside of described semi-circular groove embeds a semi-circular shape microstrip feed line and a rectangular microstrip feeder line be connected with semi-circular shape microstrip feed line, and described label chip is welded on semi-circular shape microstrip feed line; The middle part of described radiation patch has a L shape groove, and the bottom of radiation patch arranges the short circuit via hole that is communicated with radiation patch upper strata and grounded metal paster lower floor.
2. ultra broadband circular polarization anti-metal according to claim 1 is easy to the RFID label antenna of impedance adjustment, it is characterized in that: described radiation patch, grounded metal paster and short circuit via hole all adopt copper product to make, described medium substrate adopts FR4 medium substrate.
3. ultra broadband circular polarization anti-metal according to claim 1 is easy to the RFID label antenna of impedance adjustment, it is characterized in that: the model of described label chip is the Monza4 of Impinj company, this label chip has the input impedance of 11-j143 Ω and the threshold power of-17.4dBm when operating frequency is 915MHz.
4. the ultra broadband circular polarization anti-metal according to any one of claim 1-3 is easy to the RFID label antenna of impedance adjustment, it is characterized in that: described radiation patch is of a size of 58mm × 58mm.
5. the ultra broadband circular polarization anti-metal according to any one of claim 1-3 is easy to the RFID label antenna of impedance adjustment, it is characterized in that: the planar dimension of described medium substrate and the measure-alike of grounded metal paster, be 68mm × 68mm, and the thickness of medium substrate is 1.6mm.
6. the ultra broadband circular polarization anti-metal according to any one of claim 1-3 is easy to the RFID label antenna of impedance adjustment, it is characterized in that: the radius of described semi-circular groove is 25mm.
7. ultra broadband circular polarization anti-metal according to claim 6 is easy to the RFID label antenna of impedance adjustment, it is characterized in that: the annulus outer radius of described semi-circular shape microstrip feed line is 22.36mm, and inside radius is 20.39mm; The length of described rectangular microstrip feeder line is 17.3mm, and width is 2.6mm.
8. ultra broadband circular polarization anti-metal according to claim 7 is easy to the RFID label antenna of impedance adjustment, it is characterized in that: the lower surface of described label chip is foursquare microstrip feed line connecting line, and the length of this microstrip feed line connecting line is 2mm.
9. the ultra broadband circular polarization anti-metal according to any one of claim 1-3 is easy to the RFID label antenna of impedance adjustment, it is characterized in that: the large rectangle length of described L shape groove is 29.5mm, little rectangle length is 7mm, and the width of large rectangle and little rectangle is 3mm.
10. the ultra broadband circular polarization anti-metal according to any one of claim 1-3 is easy to the RFID label antenna of impedance adjustment, it is characterized in that: the distance between the center of described short circuit via hole and the lower limb of radiation patch is 4mm, and radius is 1mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610064020.4A CN105529520B (en) | 2016-01-29 | 2016-01-29 | Ultra wide band circular polarisation anti-metal is easy to the RFID label antenna of impedance adjusting |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610064020.4A CN105529520B (en) | 2016-01-29 | 2016-01-29 | Ultra wide band circular polarisation anti-metal is easy to the RFID label antenna of impedance adjusting |
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| CN105529520A true CN105529520A (en) | 2016-04-27 |
| CN105529520B CN105529520B (en) | 2018-04-20 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106876866A (en) * | 2017-03-15 | 2017-06-20 | 杭州泽济电子科技有限公司 | Insulation plug with RFID label tag |
| CN107104267A (en) * | 2017-04-18 | 2017-08-29 | 华南师范大学 | A kind of RFID paster antennas of embedded couple feed |
| CN107634333A (en) * | 2017-09-22 | 2018-01-26 | 北京邮电大学 | A UHF radio frequency identification anti-metal circular polarisation label antenna |
| CN108281773A (en) * | 2017-01-06 | 2018-07-13 | 重庆邮电大学 | A kind of customized circular polarisation anti-metal UHF RFID label antennas |
| CN109509960A (en) * | 2019-01-22 | 2019-03-22 | 公安部交通管理科学研究所 | Ultrahigh frequency RFID anti-metal tag antenna |
| CN110289479A (en) * | 2019-05-16 | 2019-09-27 | 宁波大学 | A kind of ultra-high frequency RFID label antenna of directional diagram reconstructable |
| CN110402444A (en) * | 2016-12-19 | 2019-11-01 | 天线系统有限公司 | The insensitive passive RFID tags of remote surface |
| CN111211399A (en) * | 2020-03-04 | 2020-05-29 | 电子科技大学 | Metal-resistant ultrahigh frequency electronic tag antenna conformal to petroleum pipe sleeve wall |
| CN115799827A (en) * | 2023-02-07 | 2023-03-14 | 广东工业大学 | Circularly polarized compact full-duplex antenna and wireless communication device |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110402444A (en) * | 2016-12-19 | 2019-11-01 | 天线系统有限公司 | The insensitive passive RFID tags of remote surface |
| CN108281773A (en) * | 2017-01-06 | 2018-07-13 | 重庆邮电大学 | A kind of customized circular polarisation anti-metal UHF RFID label antennas |
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| CN107104267A (en) * | 2017-04-18 | 2017-08-29 | 华南师范大学 | A kind of RFID paster antennas of embedded couple feed |
| CN107634333A (en) * | 2017-09-22 | 2018-01-26 | 北京邮电大学 | A UHF radio frequency identification anti-metal circular polarisation label antenna |
| CN109509960A (en) * | 2019-01-22 | 2019-03-22 | 公安部交通管理科学研究所 | Ultrahigh frequency RFID anti-metal tag antenna |
| CN109509960B (en) * | 2019-01-22 | 2023-09-22 | 公安部交通管理科学研究所 | Ultrahigh frequency RFID anti-metal tag antenna |
| CN110289479A (en) * | 2019-05-16 | 2019-09-27 | 宁波大学 | A kind of ultra-high frequency RFID label antenna of directional diagram reconstructable |
| CN111211399A (en) * | 2020-03-04 | 2020-05-29 | 电子科技大学 | Metal-resistant ultrahigh frequency electronic tag antenna conformal to petroleum pipe sleeve wall |
| CN111211399B (en) * | 2020-03-04 | 2021-10-26 | 电子科技大学 | Metal-resistant ultrahigh frequency electronic tag antenna conformal to petroleum pipe sleeve wall |
| CN115799827A (en) * | 2023-02-07 | 2023-03-14 | 广东工业大学 | Circularly polarized compact full-duplex antenna and wireless communication device |
| CN115799827B (en) * | 2023-02-07 | 2023-05-05 | 广东工业大学 | Circularly polarized compact full duplex antenna and wireless communication device |
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