CN102509893A - Equated symmetrical type open-circuit coaxial antenna - Google Patents
Equated symmetrical type open-circuit coaxial antenna Download PDFInfo
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- CN102509893A CN102509893A CN2011103472706A CN201110347270A CN102509893A CN 102509893 A CN102509893 A CN 102509893A CN 2011103472706 A CN2011103472706 A CN 2011103472706A CN 201110347270 A CN201110347270 A CN 201110347270A CN 102509893 A CN102509893 A CN 102509893A
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Abstract
The invention discloses an equated symmetrical type open-circuit coaxial antenna, which is applied on the radio frequency identification technical field. The equated symmetrical type open-circuit coaxial antenna comprises a receiving unit and a power feeding unit, wherein the receiving unit uses an equated coaxial cable structure, the total distribution capacitance of the coaxial cable is decomposed into a plurality of segmentary distributed capacitances in serial connection, thus the total distribution capacitance is reduced, the resonance frequency of a coil is increased and the perimeter limit of the coaxial cable open-circuit antenna is broken, therefore the antenna covers larger ranges and farther reading distance; the power feeding unit feeds the power for the receiving unit in a not-balanced way; the antenna is completely symmetrical relative to the reference position, so as to not only completely suppressing the common mode interference but also transit the not balanced feed structure to the balanced antenna. The equated symmetrical type open-circuit coaxial antenna is applied in the long-distance high frequency radio frequency identification system, so as to effectively improve the system performance and reduce the system cost.
Description
Technical field
The present invention relates to the REID field, relate in particular to a kind of five equilibrium symmetrical expression open circuit coaxial antenna.
Background technology
Register in intelligent book shop, meeting, in the thing network sensing layer technology of application such as motion timing, access control and attendance, jewelry management, concerning security matters asset management; The long thing network sensing layer technology that is considered to tool prospect apart from the high-frequency radio frequency recognition technology; Here high frequency refers to the frequency range of 3MHz to 30MHz; The electromagnetic wave of this frequency range wavelength in a vacuum is 10 to 100 meters; REID is chosen 13.56MHz or the 6.78MHz centre carrier frequency as radio frequency transceiver usually on this frequency range, and all tag read distance all can be regarded as long apart from the high-frequency radio frequency recognition technology greater than 20 centimetres REID on this frequency range; At present, the long air interface protocol that standard definitions such as ISO 15693, ISO 18000-3, IPX arranged in the world apart from the high-frequency radio frequency recognition technology.
Length comprises reader and RF tag usually apart from the high-frequency radio frequency recognition system, utilizes the mode of inductance coupling high to transmit energy and data between reader and the RF tag.In general, reader antenna and label antenna are coil form, and according to Faraday's electromagnetic induction law, the electric current of one of them coil changes caused magnetic flux change can form induced electromotive force on another coil.Based on this principle, carry out power transfer and exchanges data between two slave antennas.Whole length apart from radio frequency system in, reader antenna directly affects the outward appearance and the performance of whole system.
For reaching best reading performance, the coiling growth should possess high Q value, low-resistance characteristic apart from the cable of high frequency reader antenna.For reducing cost, most long coaxial cables that all adopt 75 ohm or 50 ohm apart from the high frequency reader antenna.Because the skin depth of copper cash only has 18 microns when 13.56MHz, the screen that therefore directly utilizes coaxial cable can reach the similar resistance characteristic of single core Stranded cable with same diameter as current path; Wherein, dual mode can be realized this type of reader antenna, is respectively short circuit type and open ended.The feed of short circuit type antenna is added in the two ends that coaxial cable shielding layer breaks off mouth respectively, simultaneously at disconnected opening part shunt capacitance, forms resonant tank with the inductance, receives voltage and draws from the two ends of breaking off mouth, and two ends are short circuit with respect to direct current; The feed of open ended antenna is added in coaxial cable shielding layer respectively and breaks off an end of mouth and the end that the coaxial cable inner core conductor breaks off mouth; Distributed nature electric capacity between screen and the interior core conductor forms resonant tank as a part and the coil inductance of total capacitance; Receiving voltage is the load resistance voltage, and two ends are open circuit with respect to direct current.Because the electric interfering field in the space is to the influence of the reception voltage at the shunt capacitance two ends of short circuit type antenna; The influence of the reception voltage at comparison open ended antenna load resistance two ends is much bigger, so generally use the open ended antenna as long antenna apart from the high-frequency radio frequency recognition system.
But traditional open ended antenna structure has bigger total distributed capacitance.This has limited the overall circumference of antenna, has also limited the read range and the maximum read distance of antenna; Therefore, existing meeting register or the application of access control and attendance passage in, width of channel generally is no more than 1.2 meters, in intelligent book shop or intelligent commodity shelf etc. are used, needs multiple antenna to cover a bookshelf or shelf usually, has increased installation cost greatly.
Summary of the invention
To above-mentioned technical problem; The object of the present invention is to provide a kind of five equilibrium symmetrical expression open circuit coaxial antenna; Its total distributed capacitance with coaxial cable resolves into the segmentation distributed capacitance of a plurality of series connection, has reduced total distributed capacitance, has improved the resonance frequency of coil; Broken through the girth restriction of coaxial cable open antenna, made the bigger scope of said antenna covering and reach the farther distance that reads; And the structure of antenna can fully suppress common mode disturbances with respect to symmetrical fully with reference to ground, unbalanced feeder line structure is carried out the transition to the structure of the antenna of balance.
For achieving the above object, the present invention realizes through following technical scheme:
A kind of five equilibrium symmetrical expression open circuit coaxial antenna; Comprise receiving element and feed element, said receiving element is used to receive field signal, wherein; Said receiving element has reduced the total distributed capacitance that constitutes the coaxial coil of antenna, breaks through the girth restriction of coaxial cable open ended antenna; Said feed element uses uneven mode to be the receiving element feed.
Special, said coaxial coil is made up of coaxial cable, said coaxial cable comprise screen, interior core conductor and be arranged at screen and interior core conductor between insulating barrier.
Special, the head and the tail of said coaxial cable connect, and said interior core conductor begins evenly to be provided with plurality of nodes from an end of cable, and interior core conductor breaks off from node.
Special, said screen is provided with node in the centre position of adjacent two nodes of interior core conductor, and screen breaks off from node.
Special, said interior core conductor gap, screen is connected, said screen gap, interior core conductor is connected.
Special, said feed element comprises feeder line, said feeder line uses uneven mode to be the receiving element feed.
Special, the node place of said interior core conductor all can be used as feed placement, and said feeder line comprises the screen of feeder line inner core and feeder line, and said feeder line inner core is connected with an end of interior core conductor gap, and the screen of said feeder line is connected with the screen of coaxial cable.
Special, the structure of said antenna is with respect to symmetrical fully with reference to ground.
Beneficial effect of the present invention; Adopt the coaxial cable structure of technical scheme of the present invention through five equilibrium; The total distributed capacitance of coaxial cable is resolved into the segmentation distributed capacitance of a plurality of series connection, reduced total distributed capacitance, thereby improved the resonance frequency of coil; Broken through the girth restriction of coaxial cable open antenna, made the bigger scope of said antenna covering and reach the farther distance that reads; And the structure of antenna of the present invention is with respect to symmetrical fully with reference to ground; Can fully suppress common mode disturbances, unbalanced feeder line structure is carried out the transition to the structure of the antenna of balance, be applied to long apart from the high-frequency radio frequency recognition system; Can effectively improve systematic function, reduce system cost.
Description of drawings
According to accompanying drawing and embodiment the present invention is done further explain below.
Fig. 1 waits the sketch map of branch symmetrical expression open circuit coaxial antenna for the present invention;
Fig. 2 is the sketch map of uneven mode feed among the present invention;
Fig. 3 is the structural representation of coaxial cable;
Fig. 4 is an equivalent serial resonant circuit diagram illustraton of model of the present invention;
Fig. 5 is the sketch map of short circuit type coaxial antenna;
Fig. 6 is the sketch map of open ended coaxial antenna;
Fig. 7 is the transmission-line equivalent circuit schematic diagram of coaxial cable;
Among the figure: 101, interior core conductor; 102, insulating barrier; 103, screen; 104, plastic peel; 105, feeder line inner core; 106, the screen of feeder line.
Embodiment
Know-why of the present invention: please with reference to shown in Figure 5; Fig. 5 is the sketch map of short circuit type coaxial antenna, and the interior core conductor 101 of the coaxial cable that only drawn and screen 103, the feed of short circuit type antenna are added in the two ends that coaxial cable shielding layer 103 breaks off mouth respectively; Simultaneously at disconnected opening part shunt capacitance; Form resonant tank with the inductance, receive voltage and draw from the two ends of breaking off mouth, two ends are short circuit with respect to direct current.
Fig. 6 is the sketch map of open ended coaxial antenna; The interior core conductor 101 and the screen 103 of coaxial cable have only drawn; The feed of open ended antenna is added in coaxial cable shielding layer 103 respectively and breaks off an end of mouth and the end that coaxial cable inner core conductor 101 breaks off mouth; Distributed nature electric capacity between screen 103 and the interior core conductor 101 forms resonant tank as a part and the coil inductance of total capacitance, and receiving voltage is the load resistance voltage, and two ends are open circuit with respect to direct current.
Fig. 7 is the transmission-line equivalent circuit schematic diagram of coaxial cable, and it comprises distributed series resistance, inductance and distributed shunt conductance, electric capacity.
Can find out in the transmission-line equivalent circuit schematic diagram by coaxial cable; On coaxial cable, there are distributed series inductance and shunt capacitance; The series inductance of every meter length can be estimated by
; Wherein D is the screen external diameter, and d is the inner core conductor diameter.μ
0And μ
rBe respectively the magnetic permeability of permeability of vacuum and insulating barrier.The shunt capacitance of every meter length can by
Estimation, wherein ε
0And ε
rBe respectively dielectric constant and the medium dielectric constant of insulating barrier in the vacuum.Every meter length series inductance of most of coaxial cables can be ignored with respect to the inductance value that turns to coil with it less than 0.5 microhenry.Usually, the distributed shunt capacitance of 50 ohm coaxial cable is about every meter of 96 pico farad; The distributed shunt capacitance of 75 ohm coaxial cable is about every meter of 64 pico farad.Total capacitance with the open ended coaxial antenna is distributed shunt capacitance and external coupling shunt capacitance sum on the total cable length; Therefore the minimum value of the total capacitance of this antenna can be regarded as the distributed capacitor on the total cable length; Again because the one-turn coil that the coaxial cable of regular length turns to compare many turn coil inductance little, so the minimum value of the total inductance of this antenna can be regarded as the inductance value of the annulus that waits lines such as girth lead coiled directly.The maximum resonance frequency that can further obtain the open ended coaxial antenna thus is:
for example a pair by the individual pen open ended antenna of 2 meters long 75 ohm coaxial cable coiled; Its minimum capacity is 128 pico farads, and the maximum resonance frequency is about 10.4MHz.This antenna can't be supported the operating frequency of 13.56MHz, must reduce the length of cable, reduces electric capacity, could improve its resonance frequency.
In the 13.56MHz frequency; Adopt the coaxial cable maximum can only make 0.4 meter long, 0.4 meter wide open ended antenna; The read range of high frequency antenna is no more than 1.5 times of its size usually, and above-mentioned like this antenna only can read in the label in 0.6 meter long, the 0.6 meter wide scope.
The present invention is on the basis of open ended circuit; Separation structures such as coaxial cable employing; The total distributed capacitance of coaxial cable is resolved into the segmentation distributed capacitance of a plurality of series connection, and total distributed formula electric capacity significantly reduces, and the scope that antenna reads signal no longer receives the restriction of antenna circumference.
Below in conjunction with accompanying drawing and embodiment the present invention is described further.
In the present embodiment, a kind of five equilibrium symmetrical expression open circuit coaxial antenna, it comprises receiving element and feed element, said receiving element is made up of coaxial cable; Said feed element is made up of feeder line, and said feeder line comprises the screen 106 of feeder line inner core 105 and feeder line.
As shown in figures 1 and 3, Fig. 1 is the sketch map of branch such as the present invention symmetrical expression open circuit coaxial antenna, and the interior core conductor 101 and the screen 103 of the coaxial cable that only drawn among the figure, Fig. 3 are the structural representation of coaxial cable; Said coaxial cable is the coaxial cable structure of five equilibrium, and it comprises screen 103, interior core conductor 101, is arranged at the insulating barrier 102 between screen 103 and the interior core conductor 101 and is arranged at the outermost plastic peel 104 of coaxial cable; The head and the tail of said coaxial cable connect; Core conductor 101 begins at interval suitably apart from evenly being provided with N node from an end of cable in it; Be labeled as the 1st, 3,5 respectively ..., a 2N-1 node, and interior core conductor breaks off from node, and screen 103 is a connection status.
Said screen 103 is provided with node in the centre position of adjacent two nodes of interior core conductor 101, and the node number also is N, be labeled as the 2nd, 4,6 respectively ..., a 2N node, screen 103 is from the node disconnection, and interior core conductor 101 is a connection status.
As shown in Figure 2, Fig. 2 is the sketch map of uneven mode feed among the present invention; In said the 1st, 3,5 of core conductor 101 ..., a 2N-1 node place all can be used as feed placement, said feeder line inner core 105 is connected with an end of interior core conductor gap, the screen 106 of said feeder line is connected with the screen 103 of coaxial cable; The structure of antenna of the present invention is with respect to symmetrical fully with reference to ground; Not only can fully suppress common mode disturbances; And the structure of said antenna carries out the transition to the feeder line structure of injustice the structure of the antenna of balance; Need as the short circuit type antenna, before feeder line gets into the structure of antenna, not add Ba Lun, just can accomplish conversion and coupling between balance and imbalance.
Ignore the influence of distributed resistance and distributed inductance, the five equilibrium symmetrical expression open circuit coaxial antenna of uneven mode feed can equivalence become series resonant circuit model as shown in Figure 4, wherein C
M, n, m, the total distributed capacitance of the coaxial cable between n ∈ [1,2N] expression m and the n node.L representes the overall coil inductance.The total distributed formula electric capacity that can find out five equilibrium symmetrical expression coaxial coil has only that
of coaxial coil is approximate before the five equilibrium thinks that coil inductance is directly proportional with the coil girth; The girth of symmetrical expression open circuit coaxial antenna that then reaches the 2N five equilibrium of same resonance frequency be open circuit coaxial antenna before the five equilibrium 2N doubly; The scope that is read signal by antenna is directly proportional with antenna circumference, and five equilibrium symmetrical expression open circuit coaxial antenna has bigger read range and a farther distance that reads so.Except that circle, it is square that five equilibrium symmetrical expression open circuit coaxial antenna also can coiled, and profiles such as triangle only need to guarantee to get final product with respect to ground reference planes symmetry; Coil can be individual pen, and also coiled encloses more according to circumstances.
The coaxial open antenna of said five equilibrium symmetrical expression adopts the coaxial cable structure of five equilibrium; The total distributed capacitance of coaxial cable is resolved into the segmentation distributed capacitance of a plurality of series connection; Reduced total distributed capacitance; Thereby improved the resonance frequency of coil, broken through the girth restriction of coaxial cable open ended antenna, made the bigger scope of said antenna covering and reach the farther distance that reads; And the structure of antenna of the present invention is with respect to symmetrical fully with reference to ground; Can fully suppress common mode disturbances, unbalanced feeder line structure is carried out the transition to the structure of the antenna of balance, be applied to long apart from the high-frequency radio frequency recognition system; Improve systematic function, reduce system cost.
Above-mentioned preferred embodiment of the present invention and the institute's application technology principle of being merely, any technical staff who is familiar with the present technique field in the technical scope that the present invention discloses, the variation that can expect easily or replacement, all should be encompassed in protection scope of the present invention in.
Claims (8)
1. five equilibrium symmetrical expression open circuit coaxial antenna; Comprise receiving element and feed element, said receiving element is used to receive field signal, it is characterized in that; Said receiving element has reduced the total distributed capacitance that constitutes the coaxial coil of antenna, breaks through the girth restriction of coaxial cable open ended antenna; Said feed element uses uneven mode to be the receiving element feed.
2. five equilibrium symmetrical expression according to claim 1 open circuit coaxial antenna is characterized in that said coaxial coil is made up of coaxial cable, said coaxial cable comprise screen, interior core conductor and be arranged at screen and interior core conductor between insulating barrier.
3. five equilibrium symmetrical expression open circuit coaxial antenna according to claim 2 is characterized in that the head and the tail of said coaxial cable connect, and said interior core conductor begins evenly to be provided with plurality of nodes from an end of cable, and interior core conductor breaks off from node.
4. five equilibrium symmetrical expression open circuit coaxial antenna according to claim 3 is characterized in that said screen is provided with node in the centre position of adjacent two nodes of interior core conductor, and screen breaks off from node.
5. five equilibrium symmetrical expression open circuit coaxial antenna according to claim 4 is characterized in that, said interior core conductor gap, and screen is connected, said screen gap, interior core conductor is connected.
6. five equilibrium symmetrical expression open circuit coaxial antenna according to claim 3 is characterized in that said feed element comprises feeder line, and said feeder line uses uneven mode to be the receiving element feed.
7. five equilibrium symmetrical expression open circuit coaxial antenna according to claim 6; It is characterized in that; The node place of core conductor all can be used as feed placement in said; Said feeder line comprises the screen of feeder line inner core and feeder line, and said feeder line inner core is connected with an end of interior core conductor gap, and the screen of said feeder line is connected with the screen of coaxial cable.
8. according to the described five equilibrium symmetrical expression open circuit of one of claim 1 to 7 coaxial antenna, it is characterized in that the structure of said antenna is with respect to symmetrical fully with reference to ground.
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| CN201110347270.6A CN102509893B (en) | 2011-11-04 | 2011-11-04 | Equated symmetrical type open-circuit coaxial antenna |
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| CN201110347270.6A CN102509893B (en) | 2011-11-04 | 2011-11-04 | Equated symmetrical type open-circuit coaxial antenna |
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| CN102509893B CN102509893B (en) | 2014-06-18 |
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| CN103855459A (en) * | 2012-11-29 | 2014-06-11 | 细美事有限公司 | Plasma antenna and apparatus for generating plasma having the same |
| CN105162477A (en) * | 2015-09-30 | 2015-12-16 | 北京交大思诺科技股份有限公司 | Transponder with expanded range of action |
| CN106170923A (en) * | 2013-10-21 | 2016-11-30 | 康普技术有限责任公司 | Have through coaxial cable by the antenna detection of the nonvolatile memory of direct current supply |
| CN109069005A (en) * | 2016-03-09 | 2018-12-21 | 皮尔桥健康公司 | System and method for the situation based on wireless sensor data monitoring object |
| CN109891258A (en) * | 2016-10-24 | 2019-06-14 | 皇家飞利浦有限公司 | For the balanced to unbalanced transformer in magnetic resonance imaging (MRI) system and using the MRI system of the balanced to unbalanced transformer |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103855459A (en) * | 2012-11-29 | 2014-06-11 | 细美事有限公司 | Plasma antenna and apparatus for generating plasma having the same |
| CN106170923A (en) * | 2013-10-21 | 2016-11-30 | 康普技术有限责任公司 | Have through coaxial cable by the antenna detection of the nonvolatile memory of direct current supply |
| US10181656B2 (en) | 2013-10-21 | 2019-01-15 | Commscope Technologies Llc | Antenna detection with non-volatile memory powered by DC over coaxial cable |
| CN105162477A (en) * | 2015-09-30 | 2015-12-16 | 北京交大思诺科技股份有限公司 | Transponder with expanded range of action |
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| CN109069005A (en) * | 2016-03-09 | 2018-12-21 | 皮尔桥健康公司 | System and method for the situation based on wireless sensor data monitoring object |
| CN109891258A (en) * | 2016-10-24 | 2019-06-14 | 皇家飞利浦有限公司 | For the balanced to unbalanced transformer in magnetic resonance imaging (MRI) system and using the MRI system of the balanced to unbalanced transformer |
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| CN102509893B (en) | 2014-06-18 |
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Effective date of registration: 20190411 Address after: 230061 North Village, Amber Villa, No. 6 Changjiang West Road, Shushan District, Hefei City, Anhui Province, 107 Patentee after: Wang Xinhua Address before: 214135 Block D, Cetacea, Building 1, Phase III, National Software Park, North Research Road, Linghu Avenue, New District, Wuxi City, Jiangsu Province (Bee Dance Technology) Co-patentee before: Wang Xinhua Patentee before: Yan Li |
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Effective date of registration: 20210106 Address after: Room 114-1, 1st floor, area a, building 34, No. 58, Baozhen South Road, Chongming District, Shanghai 202150 (Shanghai Baozhen economic community) Patentee after: SHANGHAI FENGZHIWU ELECTRONICS Co.,Ltd. Address before: 230061 North Village, Amber Villa, No. 6 Changjiang West Road, Shushan District, Hefei City, Anhui Province, 107 Patentee before: Wang Xinhua |
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