CN103036003A - Intelligent electric meter - Google Patents
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- CN103036003A CN103036003A CN2011102973083A CN201110297308A CN103036003A CN 103036003 A CN103036003 A CN 103036003A CN 2011102973083 A CN2011102973083 A CN 2011102973083A CN 201110297308 A CN201110297308 A CN 201110297308A CN 103036003 A CN103036003 A CN 103036003A
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Abstract
The invention provides an intelligent electric meter. The intelligent electric meter comprises a communication terminal and a meta-material antenna which are connected. The meta-material antenna comprises a dielectric substrate, a feeding point, a feeder line and a metal structure, wherein the feeding point is arranged on one surface of the dielectric substrate, the feeder line is connected with the feeding point, and the feeder line and the metal structure are mutually coupled. According to the intelligent electric meter, a meta-material antenna technology is utilized, so that the antenna can be miniaturized and internally arranged, and the meta-material antenna resonating electromagnetic waves with one wave band, two or more various wave bands is designed based on the meta-material antenna technology; and the metal structure physical size determining the antenna size is not limited by the half-wave physical length, so that a corresponding antenna can be designed according to the intelligent electric meter own size, and requirements for miniaturization of the intelligent electric meter and the internal arrangement of the antenna can be met. The intelligent electric meter applying the meta-material antenna can meet requirements for two-way real-time data exchanges between an intelligent power grid and the intelligent electric meter, and prevent phenomena of blockage, losses and the like during data exchanges.
Description
Technical field
The present invention relates to the ammeter technology, be specifically related to a kind of intelligent electric meter.
Background technology
Under the promotion of green energy conservation consciousness, the intelligent grid take intelligent electric meter as core becomes the major fields that countries in the world are competitively developed.The development intelligent grid also can allow public utilities mechanism and user be benefited.Can help electric power mechanism to reduce the operation expenditure, reduce stealing, optimize operation and summary responses user's request etc. such as intelligent grid.The user also has an opportunity to enjoy more flexibly price, because network measurement is saved cost and helped to realize home automation etc.Therefore, the development prospect of intelligent grid is quite had an optimistic view of.And intelligent electric meter estimates that global shipment will rise to from only millions of sections in 2008 approximately 5,000 ten thousand ones in 2014, and annual compound growth rate (CAGR) is up to 48%.
And from technological trend, will surpass to bidirectional real-time, open platform/modular services future.The system integration also will be important future trend, estimate that renewable, plug-in hybrid-power automobile (PHEV) and home automation etc. will be integrated among the smart electric grid system.Intelligent electric meter also will surpass to employing advanced measuring system (AMI), and become the part of following home area network (HAN).
When intelligent electric meter and intelligent grid exchanges data, not only require the electronic circuit fast throughput, and be high speed, ultra broadband, these information of jumbo transmission to the requirement of wireless transmission device-antenna.Antenna is as radiating element and the receiving device of final radiofrequency signal, and its operating characteristic will directly affect the service behaviour of whole system.Yet the important indicators such as the size of antenna, bandwidth, gain but have been subject to the restriction (gain margin under the fixed dimension, bandwidth limit etc.) of basic physical principle.The basic principle of these index limit so that the miniaturization technology difficulty of antenna considerably beyond other device, and because the complexity of the electromagnetic field analysis of radio-frequency devices, approaching these limiting values all becomes huge technological challenge.
Summary of the invention
In order to solve the problem that exists in the existing intelligent electric meter, the invention provides a kind of intelligent electric meter that uses super material antenna, by high performance super material built-in aerial technology, under the prerequisite that satisfies the intelligent electric meter performance requirement, realize miniaturization, built-inization of antenna, in order to achieve the above object, the present invention is by the following technical solutions:
One intelligent electric meter, comprise communication ends, also comprise one surpassing the material antenna, described super material antenna links to each other with described communication ends, and described super material antenna comprises a medium substrate and a distributing point that is arranged at described medium substrate one surface, the feeder line that is connected with described distributing point and a metal structure; Described feeder line and described metal structure intercouple.
Further, described metal structure is that sheet metal forms through engraving out the groove topological structure.
Further, described super material antenna also comprises ground unit, the described ground unit described distributing point both sides that distribute symmetrically; Be provided with several metallized through holes on the described ground unit.
Further, described super material antenna also comprises one with reference to ground, described with reference to ground comprise be positioned at described medium substrate relative two lip-deep first with reference to unit, ground and second with reference to the unit, ground, described first makes an end of described feeder line form microstrip line with reference to the unit, ground.
Further, described the first reference unit, ground and second is electrically connected mutually with reference to the unit, ground.
Further, described medium substrate is provided with some plated-through holes, and unit, described the first reference ground is realized being electrically connected by described plated-through hole with reference to the unit, ground with described second.
Further, unit, described the first reference ground is provided with the first metal covering unit and the second metal covering unit of mutual electrical connection, and described the first metal covering unit is relative with an end position of described feeder line, makes an end of described feeder line form described microstrip line; Unit, described the second reference ground is provided with the 3rd metal covering unit, and described the 3rd metal covering unit is relative with described the second metal covering cell position.
Further, described medium substrate is positioned at described the second metal covering unit and place, described the 3rd metal covering unit offers some plated-through holes, and described the second metal covering unit is electrically connected by described plated-through hole with described the 3rd metal covering unit.
Further, unit, described the second reference ground also comprises the 4th metal covering unit, described the 4th metal covering unit is positioned at a side of described feeder line one end, and be positioned on the bearing of trend of described feeder line, described the first metal covering unit is electrically connected by described plated-through hole with described the 4th metal covering unit.
Further, the resonance band of described super material antenna comprises 2.4GHz-2.49GHz and 5.72GHz-5.85GHz at least.
Intelligent electric meter of the present invention adopts super material antenna technology, can realize the miniaturization of antenna and built-in, the design super material antenna of electromagnetic wave resonance of a wave band, two or more different-wavebands of sening as an envoy to based on super material antenna technology, the physical size that determines the metal structure size of this antenna volume is not limited by the physical length of half-wavelength, can go out corresponding antenna according to the size design of intelligent electric meter own, can satisfy the demand of intelligent electric meter miniaturization, built-in antenna.The intelligent electric meter of using super material antenna can satisfy the requirement of two-way real time data exchange between intelligent grid and intelligent electric meter, the obstruction when avoiding exchanges data, the phenomenon such as loses.
Description of drawings
Fig. 1 is the module map of intelligent electric meter embodiment 1 of the present invention;
Fig. 2 is the module map of embodiment 1 application scenarios;
Fig. 3 is the front view of antenna the first execution mode in the intelligent electric meter of the present invention;
Fig. 4 is antenna rearview shown in Figure 3;
Fig. 5 is antenna the first execution mode S parameters simulation figure of the present invention;
Fig. 6 is the front view of antenna the second execution mode in the intelligent electric meter of the present invention;
Fig. 7 is the front view of antenna the 3rd execution mode in the intelligent electric meter of the present invention;
Fig. 8 is the metal structure enlarged drawing on second and third execution mode of antenna of the present invention;
Fig. 9 is antenna the 3rd execution mode S parameters simulation figure of the present invention;
Figure 10 is that antenna the 3rd execution mode of the present invention operates in 2.4,2.44, E direction far field simulation result figure during 2.48GHz;
Figure 11 is that antenna the 3rd execution mode of the present invention operates in 2.4,2.44, H direction far field simulation result figure during 2.48GHz;
Figure 12 is that antenna the 3rd execution mode of the present invention operates in 5.725,5.8, E direction far field simulation result figure during 5.85GHz;
Figure 13 is that antenna the 3rd execution mode of the present invention operates in 5.725,5.8, H direction far field simulation result figure during 5.85GHz.
Embodiment
Below in conjunction with the drawings and specific embodiments intelligent electric meter of the present invention is done a step explanation.
Consulting Fig. 1, is the module map of the intelligent electric meter embodiment 1 among the present invention.Wherein, intelligent electric meter 100 comprises super material antenna 10 and communication ends 11, and super material antenna 10 is connected with communication ends 11.Super material antenna 10 receives extraneous electromagnetic wave signal and is converted into the signal of telecommunication and outputs to communication ends 11, and then is input to the control end of intelligent electric meter 100; When intelligent electric meter 100 will send information,, launched after super material antenna 10 is converted to electromagnetic wave signal to super material antenna 10 output electrical signals by communication ends 11.Intelligent electric meter 100 is received and sent messages by wireless mode can avoid the usage data line, and this advantage adds new show need to be with the equipment of intelligent electric meter exchanges data time the more outstanding within comprising the smart electric grid system of intelligent electric meter.
Consulting Fig. 2, is the module map of intelligent electric meter embodiment 1 application scenarios of the present invention, intelligent electric meter 100 by super material antenna 10 can with intelligent grid in other equipment connect, carry out exchanges data.Control centre 200 shown in Fig. 2 can be intelligent grid administrative center, after the super material antenna 10 of intelligent electric meter 100 is set up data and is connected, can monitor the operating position of each intelligent electric meter 100, can also data be write in the intelligent electric meter 100 by super material antenna 10 when needed; Meter-copy device 300 is set up data with the super material antenna 10 of intelligent electric meter 100 and is connected, and can make things convenient for the meter reading personnel to obtain the electricity consumption data of each intelligent electric meter 100; Electricity consumption requestor 400 is set up data with the super material antenna 10 of intelligent electric meter 100 and is connected, and electricity consumption family or company etc. can obtain the data of the electric weight use of the record in the intelligent electric meter 100, to obtain better power program; Intelligent electric meter 100 can also connect with other equipment in the intelligent grid, carries out exchanges data.
Antenna is based on the artificial electromagnetic material Technology design and forms in the intelligent electric meter of the present invention, artificial electromagnetic material refers to sheet metal is engraved into the topological metal structure of given shape, and the topological metal structure of described given shape is arranged on certain dielectric constant and the magnetic permeability base material and the equivalent extraordinary electromagnetic material of processing and manufacturing, its performance parameter depends primarily on the topological metal structure of the given shape of its sub-wavelength.In resonance band, artificial electromagnetic material embodies the dispersion characteristics of height usually, in other words, the impedance of antenna, holds perception, equivalent dielectric constant and magnetic permeability along with violent variation can occur frequency.Thereby can adopt the artificial electromagnetic material technology that the fundamental characteristics of above-mentioned antenna is transformed, so that the medium substrate that metal structure depends on it has formed a highly dispersed extraordinary electromagnetic material equivalently, thereby realize the new antenna that radiation characteristic is abundant.Below introduce in detail and use several execution modes in the intelligent electric meter:
The first execution mode
See also Fig. 3 and Fig. 4, super material antenna 10 comprises medium substrate 1, metal structure 2, feeder line 3 and reference ground 41,42, described medium substrate 1 is rectangular tabular, and it can be made by materials such as high molecular polymer, pottery, ferroelectric material, ferrite material or ferromagnetic materials.In the present embodiment, the material of described medium substrate 1 adopts glass material (FR4) to make, thereby not only cost is low, and can guarantee to keep in different operating frequencies good antenna operating characteristic.
Described metal structure 2, feeder line 3 and reference ground 41,42 place respectively on the two relative surfaces of described medium substrate 1, described metal structure 2, feeder line 3 and reference ground 41,42 form super material antenna with described medium substrate 1, the performance of described super material antenna depends on described metal structure 2, in resonance band, super material embodies the dispersion characteristics of height usually, it is its impedance, hold perception, the dielectric constant of equivalence and magnetic permeability are along with violent variation can occur frequency, thereby by changing the fundamental characteristics of described metal structure 2 and medium substrate 1, just so that described metal structure 2 forms one according to the highly dispersed extraordinary electromagnetic material of Lorentz material resonances model equivalently with medium substrate 1.
See also Fig. 5, the working frequency range of the super material antenna in the present embodiment is 2.4GHZ～2.49GHZ and 5.72GHZ～5.85GHZ, and the gain of above-mentioned this two frequency range can reach 3.58dBi and 3.14dBi respectively.Be understandable that, it is 2.4GHZ～2.49GHZ frequency range, i.e. single-band antenna that 10 response frequencies of super material antenna can be set.
Described feeder line 3 is arranged on a side of described metal structure 2, and extends along the length direction of described metal structure 2, and itself and described metal structure 2 intercouple, and wherein, the bending of an end of described feeder line 3 extends to described metal structure 2 ends one side.In addition, embed as required the capacitive electronic component in the space between described feeder line 3 and metal structure 2, regulate signal coupling between feeder line 3 and the metal structure 2 by embedding the capacitive electronic component, by formula:
Square being inversely proportional to of the size of capacitance and operating frequency as can be known, so when the operating frequency that needs during for low operating frequency, can be by suitable embedding capacitive electronic component realization.The capacitance scope of the capacitive electronic component that adds is usually between 0-2pF, but the capacitance that embeds along with the variation of operating frequency of antenna also may exceed the scope of 0-2pF.
A described side that is positioned at described feeder line 3 with reference to ground makes an end of the described metal structure of being positioned at of described feeder line 32 ends form microstrip line 31.In the present embodiment, described with reference to ground comprise first with reference to unit 41, ground and second with reference to unit 42, ground, described first lays respectively at relative two surfaces of described medium substrate 1 with reference to unit 41, ground and second with reference to unit 42, ground.Unit 41, described the first reference ground is provided with the first metal covering unit 411 and the second metal covering unit 412 of mutual electrical connection.Unit 42, described the second reference ground is positioned at the same side of described medium substrate 1 with described feeder line 3, and is provided with the 3rd metal covering unit 421 and the 4th metal covering unit 422.
Described the first metal covering unit 411 is relative with described feeder line 3 positions, makes an end of the described metal structure of being positioned at of described feeder line 32 ends form described microstrip line 31, namely described with reference to ground for virtually.Described the second metal covering unit 412 is relative with 421 positions, described the 3rd metal covering unit.Described the 3rd metal covering unit 421 is positioned at an end of described metal structure 2, and it is tabular that described the 3rd metal covering unit 421 is long side, and identical with the bearing of trend of described feeder line 3.Described medium substrate 1 is positioned at described the second metal covering unit 412 and 421 places, described the 3rd metal covering unit offer some plated-through holes 5, and described the second metal covering unit 412 is electrically connected by described plated-through hole 5 with described the 3rd metal covering unit 421.
Described the 4th metal covering unit 422 is positioned at a side of described feeder line 3 one ends, and is positioned on the bearing of trend of described feeder line 3.Described medium substrate 1 is positioned at described the first metal covering unit 411 and 422 places, described the 4th metal covering unit offer some plated-through holes 5, and described the first metal covering unit 411 is electrically connected by described plated-through hole 5 with described the 4th metal covering unit 422.End by the first metal covering unit 411 and described feeder line 3 forms described microstrip line 31, thereby can reduce external signal the signal that transmits at described feeder line 3 is disturbed, and improves antenna gain, realizes preferably impedance matching, saves material, and cost is low.Pass through cleverly position setting between 411 to the 4th metal covering unit 422, described the first metal covering unit, thereby take less space with making described reference, just realize larger area.In addition, by described plated-through hole 5 is set, thereby can further improve described area with reference to ground.
In sum, topological form and the layout described microstrip line 31 of super material antenna of the present invention by critically controlling metal structure 2, the effective dielectric constant and the magnetic permeability that needing to obtain distribute, and make antenna can realize preferably impedance matching in working frequency range, finish expeditiously power conversion, and obtain desirable radiation pattern, it is little that it takies volume, low to environmental requirement, gains high, applied range, the built-in aerial of applicable intelligent electric meter.
The second execution mode
As shown in Figure 6, be the structural representation of the super material antenna 10 of the embodiment of the invention.Super material antenna 10 in the present embodiment comprises medium substrate 7 and is arranged on the distributing point 5 on the medium substrate 7, the feeder line 4 that is connected with this distributing point 5, the metal structure 6 of plane tabular.Wherein, feeder line 4 intercouples with metal structure 6; Metal structure 6 is that sheet metal forms through engraving out groove topological structure 61, remove the material of groove topological structure 61 correspondences when engraving, remaining sheet metal is metal structure 6, after engraving out groove topological structure 61, presents the metal routing 62 that is included in the metal structure 6 on the sheet metal; The spacing of adjacent slot is the width of metal routing 62 in the groove topological structure 61, and the groove width of groove topological structure 61 equates with the width of metal routing 62, and is 0.15mm; Medium substrate 7 can be made by ceramic material, macromolecular material, ferroelectric material, ferrite material or ferromagnetic material, preferably, made by macromolecular material, and can be the macromolecular materials such as FR-4, F4B particularly.
In the present embodiment, metal structure 6 is axisymmetric plane tabular.Wherein metal structure 6 is made for copper or ag material.Be preferably copper, cheap, conduct electricity very well.In order to realize better impedance matching, metal structure 6 also can be copper and silver combination.
See also Fig. 7, be the third embodiment of the invention front view, the 3rd execution mode and the difference of the second execution mode are also to comprise ground unit 8, are provided with some metallized through holes 81 on the ground unit 8; Ground unit 8 described distributing point 5 both sides that distribute symmetrically, the selection of medium substrate 7 is identical with embodiment 1.Figure 8 shows that the enlarged drawing of the metal structure of the second execution mode and the 3rd execution mode.That signal feed-in mode can have multiple between feeder line 4 and the metal structure 6 with being appreciated that.Described feeder line 4 directly links to each other with described metal structure 6; And described feeder line 4 and the connecting point position that links to each other of metal structure 6 can be positioned at the optional position on the metal structure 6.The end that feeder line 4 adopts the encirclement mode to be arranged at described metal structure 6 peripheries and feeder line 4 is arranged at metal structure 6 peripheral optional positions.
This super material antenna utilizes the characteristic of artificial electromagnetic material, the mode of metal structure is engraved in employing at sheet metal, form an effective dielectric constant according to the electromagnetic material of Lorentz lorentz's material resonances model dispersion so that metal structure and the medium substrate that depends on metal structure are common, thereby design the shake antenna of frequency range of multi resonant.Antenna shown in the second execution mode and the 3rd execution mode makes 2.4GHz-2.49GHz and two frequency range electromagnetic waves of 5.72GHz-5.85GHz resonance, the length of metal structure 6 and widely can do any adjustment according to the communication apparatus organization distribution, but metal structure 6 planforms keep getting final product with second and third execution mode is consistent, should can for the communication apparatus of single-frequency 2.4GHz-2.49GHz or 5.72GHz-5.85GHz frequency range, also can be used for the communication apparatus of double frequency 2.4GHz-2.49GHz and 5.72GHz-5.85GHz frequency range by super material antenna.
Be illustrated in figure 9 as the S parameters simulation figure of third embodiment of the invention, the antenna that the figure shows the 3rd execution mode has respectively at 2.4GHz and 5.8018GHz-15.426dB and-loss of 19.184dB, in 2.4GHz-2.49GHz of the presently claimed invention and 5.72GHz-5.85GHz frequency band, all have-loss below the 10dB, show that antenna of the present invention can work separately in 2.4GHz-2.49GHz or 5.72GHz-5.85GHz frequency band, also can in 2.4GHz-2.49GHz and 5.72GHz-5.85GHz frequency band, work simultaneously, and satisfy in the intelligent electric meter requirement to super material antenna 10.
Figure 10, Figure 11, Figure 12 and Figure 13 show respectively that the super material antenna 10 of third embodiment of the invention operates in 2.4,2.44, when 2.48GHz and 5.725,5.8,5.85GHz respectively at vertical plane (E-Plane) and horizontal plane (H-Plane) direction far field simulation result figure, the polarization effect that can observe super material antenna of the present invention in this result is not second to existing antenna and meet application standard.
Among the present invention, about the processing and manufacturing of super material antenna 10, as long as satisfy design principle of the present invention, can adopt various manufactures.Prevailing method is to use the manufacture method of all kinds of printed circuit board (PCB)s (PCB), as the PCB that covers copper makes and all can satisfy processing request of the present invention.Except this processing mode, can also introduce according to the actual needs other manufacturing process, but such as the flexible PCB processing of conductive silver paste printing ink processing mode, all kinds of deformation devices, the processing mode of iron plate antenna and the processing mode of iron plate and PCB combination.Wherein, iron plate and PCB combination processing mode refers to utilize the accurate processing of PCB to finish the processing of groove topological structure, finishes other slave part with iron plate.Owing to adopting cheaply that copper product forms described metal structure 6, thus easily oxidized and super material antenna 10 resonance frequency shifts or performance are sharply descended in the exposure air, so be provided with nonmetallic anti-oxidation film on the super material antenna surface.Because main performance of the present invention all concentrates on the design of metal structure 6 groove topological structures 61, therefore, the lead-in wire of feeder line 4 affects less to the radiation frequency of super material antenna 10.Based on these characteristics, super material antenna can be placed in any position of system, the complexity of the installation testing of simplification flexibly.
The above is described embodiments of the invention by reference to the accompanying drawings; but the present invention is not limited to above-mentioned embodiment; above-mentioned embodiment only is schematic; rather than restrictive; those of ordinary skill in the art is under enlightenment of the present invention; not breaking away from the scope situation that aim of the present invention and claim protect, also can make a lot of forms, these all belong within the protection of the present invention.
Claims (10)
1. an intelligent electric meter, comprise communication ends, it is characterized in that, also comprise and one surpass the material antenna, described super material antenna links to each other with described communication ends, and described super material antenna comprises a medium substrate and a distributing point that is arranged at described medium substrate one surface, the feeder line that is connected with described distributing point and a metal structure; Described feeder line and described metal structure intercouple.
2. intelligent electric meter according to claim 1 is characterized in that, described metal structure is that sheet metal forms through engraving out the groove topological structure.
3. intelligent electric meter according to claim 1 is characterized in that, described super material antenna also comprises ground unit, the described ground unit described distributing point both sides that distribute symmetrically; Be provided with several metallized through holes on the described ground unit.
4. intelligent electric meter according to claim 1, it is characterized in that, described super material antenna also comprises one with reference to ground, described with reference to ground comprise be positioned at described medium substrate relative two lip-deep first with reference to unit, ground and second with reference to the unit, ground, described first makes an end of described feeder line form microstrip line with reference to the unit, ground.
5. intelligent electric meter according to claim 4 is characterized in that, described the first reference unit, ground and second is electrically connected mutually with reference to the unit, ground.
6. intelligent electric meter according to claim 5 is characterized in that, described medium substrate is provided with some plated-through holes, and unit, described the first reference ground is realized being electrically connected by described plated-through hole with reference to the unit, ground with described second.
7. according to claim 4 or 5 or 6 described intelligent electric meters, it is characterized in that, unit, described the first reference ground is provided with the first metal covering unit and the second metal covering unit of mutual electrical connection, described the first metal covering unit is relative with an end position of described feeder line, makes an end of described feeder line form described microstrip line; Unit, described the second reference ground is provided with the 3rd metal covering unit, and described the 3rd metal covering unit is relative with described the second metal covering cell position.
8. intelligent electric meter according to claim 7, it is characterized in that, described medium substrate is positioned at described the second metal covering unit and place, described the 3rd metal covering unit offers some plated-through holes, and described the second metal covering unit is electrically connected by described plated-through hole with described the 3rd metal covering unit.
9. intelligent electric meter according to claim 7, it is characterized in that, unit, described the second reference ground also comprises the 4th metal covering unit, described the 4th metal covering unit is positioned at a side of described feeder line one end, and be positioned on the bearing of trend of described feeder line, described the first metal covering unit is electrically connected by described plated-through hole with described the 4th metal covering unit.
10. each described intelligent electric meter is characterized in that according to claim 1-9, and the resonance band of described super material antenna comprises 2.4GHz-2.49GHz and 5.72GHz-5.85GHz at least.
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| CN201110297308.3A CN103036003B (en) | 2011-09-30 | 2011-09-30 | Intelligent electric meter |
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| CN201110297308.3A CN103036003B (en) | 2011-09-30 | 2011-09-30 | Intelligent electric meter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105098319A (en) * | 2015-06-17 | 2015-11-25 | 国家电网公司 | Antenna applicable for micropower wireless communication module of intelligent electric meter |
| CN108152548A (en) * | 2017-12-30 | 2018-06-12 | 东莞市输变电工程公司 | A kind of intelligent wireless ammeter |
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| CN101667680A (en) * | 2009-08-31 | 2010-03-10 | 深圳市启汉科技有限公司 | Monopole radio frequency antenna |
| CN202395143U (en) * | 2011-09-30 | 2012-08-22 | 深圳光启高等理工研究院 | Intelligent ammeter |
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| US20060284784A1 (en) * | 2005-06-17 | 2006-12-21 | Norman Smith | Universal antenna housing |
| CN101667680A (en) * | 2009-08-31 | 2010-03-10 | 深圳市启汉科技有限公司 | Monopole radio frequency antenna |
| CN202395143U (en) * | 2011-09-30 | 2012-08-22 | 深圳光启高等理工研究院 | Intelligent ammeter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105098319A (en) * | 2015-06-17 | 2015-11-25 | 国家电网公司 | Antenna applicable for micropower wireless communication module of intelligent electric meter |
| CN105098319B (en) * | 2015-06-17 | 2019-02-19 | 国家电网公司 | A kind of antenna suitable for intelligent electric meter micropower wireless communication module |
| CN108152548A (en) * | 2017-12-30 | 2018-06-12 | 东莞市输变电工程公司 | A kind of intelligent wireless ammeter |
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| CN103036003B (en) | 2016-08-31 |
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