CN107395231A - The cantilever beam receiver front end that the LNA of internet of things oriented standing wave energy is collected - Google Patents
The cantilever beam receiver front end that the LNA of internet of things oriented standing wave energy is collected Download PDFInfo
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- CN107395231A CN107395231A CN201710700781.9A CN201710700781A CN107395231A CN 107395231 A CN107395231 A CN 107395231A CN 201710700781 A CN201710700781 A CN 201710700781A CN 107395231 A CN107395231 A CN 107395231A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/1607—Supply circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/50—Circuits using different frequencies for the two directions of communication
- H04B1/52—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
- H04B1/525—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa with means for reducing leakage of transmitter signal into the receiver
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Abstract
The present invention proposes the cantilever beam receiver front end that the LNA of internet of things oriented standing wave energy is collected, including：Microwave antenna, dc source, rechargeable battery, cantilever beam LNA, frequency mixer, local oscillator and the intermediate-frequency filter that there is standing wave energy to collect.Wherein, there is the cantilever beam LNA that standing wave energy is collected to be made up of 2 LC tunable band-stop filters, 2 AC/DC modular converters, input tuning network, amplifier section and output tuning network.LC bandstop filters include two planar inductors and two condenser type cantilever beams, by controlling the drop-down driving voltage of condenser type cantilever beam to adjust the capacitance of access filter network, it is identical with the frequency domain of standing wave signal so as to adjust the passband frequency domain of wave filter, to collect the standing wave energy at LNA both ends, and be converted into direct current signal using AC/DC modular converters and be stored in rechargeable battery, pass through power supply of the dc source to active device.The present invention simply and efficiently realizes the collection of LNA both ends standing wave energy, improves the electromagnetic compatible environment of circuit.
Description
Technical field
The present invention relates to the LNA of microelectromechanical systems (MEMS) technical field, especially internet of things oriented standing wave
The cantilever beam receiver front end of collection of energy.
Background technology
Nowadays, the concept of Internet of Things receives much concern in worldwide, will be various it is desirable to the development by science and technology
Information sensing device combines with internet.And one of core technology as Internet of Things, microwave transmitting and receiving component play extremely
Important effect.As the important component of microwave transmitting and receiving component, LNA is used to amplify the microwave signal that antenna receives, so
And microwave signal can form standing wave in LNA two-ports, the interference that this part standing wave signal has electromagnetic compatible environment to circuit is made
With.Therefore, the proposition of the receiver front end with standing wave energy collecting action provides possibility to solve this problem, has latent
Application prospect.
The content of the invention
Goal of the invention：It is an object of the invention to provide the cantilever beam that the standing wave energy of LNA of internet of things oriented a kind of is collected
Receiver front end, the microwave signal that receiver is received using microwave antenna, microwave signal access are collected with standing wave energy
LNA is amplified, while carries out standing wave energy collection, and is converted into direct current signal using AC/DC modular converters, is stored in charging
In battery, for the self-powered of receiver, while collection of energy is realized, standing wave electromagnetic interference, the signal after amplification are reduced
Frequency mixer, intermediate-frequency filter are sequentially entered, finally realizes that intermediate frequency exports.
Technical scheme：To realize above-mentioned technique effect, the present invention proposes following technical scheme：
The cantilever beam receiver front end that the LNA of internet of things oriented standing wave energy is collected, including：Microwave antenna, direct current
Source, LNA, rechargeable battery, frequency mixer, local oscillator and the intermediate-frequency filter that there is standing wave energy to collect；With standing wave energy
The LNA of collection includes：Input tuning network, amplifier section, output tuning network, No.1 LC bandstop filters, No.1 AC/DC moulds
Block, No. two LC bandstop filters and No. two AC/DC modules；
Input tuning network, amplifier section, output tuning network are sequentially connected to form LNA structures；Input tuning network
Input is connected with microwave antenna, for receiving microwave signal；The output end for exporting tuning network is filtered by frequency mixer and intermediate frequency
Ripple device is connected, and frequency mixer is connected with local oscillator simultaneously；The input of No.1 LC bandstop filters and input tuning network
Input is connected, and output end is connected by No.1 AC/DC modules with rechargeable battery input；The input of No. two LC bandstop filters
Hold and be connected with exporting the output end of tuning network, output end is connected by No. two AC/DC modules with rechargeable battery input；Charging
The output end of battery is connected with DC supply input；Dc source is used to power to active device in receiver front end.
No.1 LC bandstop filters, No. two LC bandstop filters, input tuning network, amplifier section, output tuning network,
No.1 AC/DC modules, No. two AC/DC modules are all two-port network.
The LC bandpass filters include：Planar inductor L1, planar inductor L2, condenser type cantilever beam K1, condenser type cantilever
Beam K2；Wherein, condenser type cantilever beam K1 one end as LC bandpass filters input and be connected with planar inductor L1 one end,
Condenser type cantilever beam K1 other end connection ground；The planar inductor L1 other end respectively with planar inductor L2, condenser type cantilever beam
K2 is connected, planar inductor L2 other end ground connection, the output end of the condenser type cantilever beam K2 other end as LC bandpass filters.
Applying specific drop-down driving voltage turns on condenser type cantilever beam K1 and condenser type cantilever beam K2, now the two electricity
Appearance formula cantilever beam is equivalent to electric capacity C1 and C2, and input tuning network and the upper band connection frequency for exporting tuning network are f1：
Lower band connection frequency is f2：
Wherein f1＜ f2.The frequency f for radiofrequency signal that and if only if meets f1≤f≤f2When, can be by inputting tuning network
With output tuning network.By adjust apply drop-down driving voltage can adjust condenser type cantilever beam K1, K2 equivalent capacity C1,
C2, input tuning network can be adjusted and export the passband frequency domain of tuning network.
No.1 LC bandstop filters and No. two LC bandstop filters, they are identical, are by based on MEMS skills
Condenser type cantilever beam K4, condenser type cantilever beam K3 and planar inductor L4, the planar inductor L3 of art are formed；Wherein, condenser type cantilever
Beam K4 one end as LC bandstop filters input and be connected with planar inductor L4 one end, condenser type cantilever beam K4's is another
End connection ground, the planar inductor L4 other end connect condenser type cantilever beam K3 and planar inductor L3 respectively, and planar inductor L3's is another
One end is grounded, the output end of the condenser type cantilever beam K3 other end as LC bandstop filters；By controlling condenser type cantilever beam
K3 and condenser type cantilever beam K4 drop-down driving voltage, can adjust the capacitance size of access, and then can adjust wave filter
Passband frequency domain.
Applying specific drop-down driving voltage turns on condenser type cantilever beam K4 and condenser type cantilever beam K3, now the two electricity
It is f that condenser type cantilever beam, which is equivalent to electric capacity C4 and the upper cut off frequency of C3, LC bandstop filter,3：
Lower limiting frequency is f4：
Wherein f3＜ f4.The frequency f for radiofrequency signal that and if only if meets f≤f3Or f >=f4When, No.1 LC bands can be passed through
Hinder wave filter and No. two LC bandstop filters.Condenser type cantilever beam K3, K4 can be adjusted by adjusting application drop-down driving voltage
Equivalent capacity C3, C4, so as to adjust the stopband frequency domain of No.1 LC bandstop filters and No. two LC bandstop filters.
The planar inductor includes：HR-Si substrate, first paragraph transmission line, second segment transmission line, inductance coil, first connect
Connect support column and the second connection support column；First paragraph transmission line and second segment transmission line are respectively arranged at HR-Si substrate upper surface
Both sides, first paragraph transmission line upper surface are additionally provided with silicon nitride medium layer；Inductance coil is vacantly arranged on planar inductor top, and
It is connected respectively with first paragraph transmission line, second segment transmission line by the first connection support column, the second connection support column.
The condenser type cantilever beam includes：HR-Si substrate, the 3rd section of transmission line, the 4th section of transmission line, cantilever beam and under
Pulling electrode；
3rd section of transmission line, the 4th section of transmission line are separately positioned on HR-Si substrate upper surface both ends, and pull-down electrode is set
On HR-Si substrate upper surface, and between the 3rd section of transmission line and the 4th section of transmission line, pull-down electrode is provided with first
Silicon nitride medium layer；3rd section of transmission line is provided with anchor area, and the 4th section of transmission line is provided with second towards pull-down electrode one end top
Silicon nitride medium layer；Cantilever beam is vacantly arranged on condenser type cantilever beam top, and one end of cantilever beam is connected with anchor area.
Microwave signal is received by microwave antenna, and signal is amplified by inputting tuning network by amplifier section, wherein not passing through
The microwave signal of tuning network forms standing wave in input, and the standing wave can pass through complementary with input tuning network passband frequency domain one
Number LC bandstop filters, and then direct current signal is converted to by No.1 AC/DC modules, charging energy-storing is carried out to No.1 rechargeable battery；
Signal after amplification is exported by output tuning network output end, and similarly, the standing wave of output tuning network output end can lead to
No. two LC bandstop filters are crossed, are changed by No. two AC/DC modules, by rechargeable battery energy storage, rechargeable battery is by stored energy transfer to directly
Flow the power supply that power supply is used for active device in receiver；The signal of output tuning network output end output passes through frequency mixer and local
Reference signal caused by oscillator is mixed, and realizes that intermediate frequency exports by intermediate-frequency filter.
Beneficial effect：Compared with prior art, the present invention has the advantage that：
The cantilever beam receiver that the LNA of the internet of things oriented of present invention standing wave energy is collected, in traditional LNA structures two
End adds standing wave energy collection structure, it is only necessary to the size of the drop-down driving voltage of simple control condenser type cantilever beam, just
Filtering of the LC bandstop filters to standing wave is adjusted, it is not only simple to operate, and positive effect.Input tuning network and output tunes
Microwave signal outside network passband section can be in two LC tunable band-stops in input and output end formation standing wave signal, the present invention
The passband frequency domain of wave filter can be tuned into identical with the frequency domain of standing wave signal, can collect the standing wave energy at LNA both ends, and utilize
AC/DC modular converters are converted into direct current signal, are ultimately stored in rechargeable battery, for the self-powered of receiver, are realizing energy
While amount is collected, the electromagnetic compatible environment of receiver circuit is also improved.
Brief description of the drawings
Fig. 1 is the structural frames that the LNA of the internet of things oriented of the present invention obtains the cantilever beam receiver front end of standing wave energy collection
Figure；
Fig. 2 is the structured flowchart for the cantilever beam LNA that there is standing wave energy to collect in the present invention；
Fig. 3 is to form input tuning network in the present invention and export the schematic diagram of the LC bandpass filters of tuning network；
Fig. 4 is to form input tuning network in the present invention and export the equivalent circuit of the LC bandpass filters of tuning network
Figure；
Fig. 5 is the schematic diagram of LC bandstop filters in the present invention；
Fig. 6 is the equivalent circuit diagram of LC bandstop filters in the present invention；
Fig. 7 is the top view of planar inductor；
Fig. 8 is AA ' the faces profile of planar inductor；
Fig. 9 is the top view of condenser type cantilever beam；
Figure 10 is BB ' the faces profile of condenser type cantilever beam.
In figure：1st, microwave antenna, 2, dc source, 3, the cantilever beam LNA for having that standing wave energy collects, 4, No.1 LC band resistances
Wave filter, 5, No.1 AC/DC modules, 6, rechargeable battery, 7, input tuning network, 8, amplifier section, 9, output tuning network,
10th, No. two LC bandstop filters, 11, No. two AC/DC modules, 12, frequency mixer, 13, local oscillator, 14, intermediate-frequency filter,
15th, intermediate frequency exports, and 16, silicon layer, 17, SiO2Layer, 18, first paragraph transmission line, 19, second segment transmission line, 20, inductance coil, 21,
First connection support column, the 22, second connection support column, 23, silicon nitride medium layer, 24, pull-down electrode, 25, the 3rd sections of transmission lines,
26th, the 4th section of transmission line, the 27, second silicon nitride medium layer, the 28, first silicon nitride medium layer, 29, anchor area, 30, cantilever beam.
Embodiment
The present invention is further described below in conjunction with the accompanying drawings.
Fig. 1, the LNA of 2 internet of things oriented for showing the present invention obtain the cantilever beam receiver front end of standing wave energy collection
Structured flowchart, in figure, including：Microwave antenna 1, dc source 2, the LNA3 with standing wave energy collection, rechargeable battery 6, mixing
Device 12, local oscillator 13, intermediate-frequency filter 14 and intermediate frequency output 15.Wherein, there is the LNA3 that standing wave energy is collected by No.1
9, No. two LC bandstop filters 4, No.1 AC/DC modules 5, input tuning network 7, amplifier section 8, output tuning network LC band resistances
Wave filter 10 and No. two AC/DC modules 11 are formed.Specific annexation is as follows：Microwave signal is received by microwave antenna 1, microwave letter
Number from the input input of tuning network 7 input, the input connection No.1 LC tunable band-stop filters 4 of input tuning network 7
Input, the input of the output end connection amplifier section 8 of input tuning network 7, the output termination output tuning of amplifier section 8
The input of network 9, the output end of output tuning network 9 connect the input of No. two LC tunable band-stop filters 10, microwave letter
Number reach frequency mixer 12 after the output end output of output tuning network 9, with local oscillator 13 caused by oscillator signal mixed
After being mixed at frequency device 12,15 are occured frequently in being realized by intermediate-frequency filter 14；The output end connection of No.1 LC tunable band-stop filters 4
The input of No.1 AC/DC modular converters 5, the output end connection rechargeable battery 6 of No.1 AC/DC modular converters 5；No. two LC are adjustable
The output end of bandstop filter 10 connects the input of No. two AC/DC modular converters 11, the output of No. two AC/DC modular converters 11
End also connects rechargeable battery 6；Rechargeable battery 6 connects dc source 2, and dc source 2 is given the LNA3 collected with standing wave energy, mixed
Frequency device 12, local oscillator 13 are powered.
Fig. 3, Fig. 4 are respectively to form input tuning network in the present invention and export the original of the LC bandpass filters of tuning network
Reason figure and equivalent circuit diagram.
Form input tuning network and export tuning network LC bandpass filters by planar inductor L1, planar inductor L2,
Condenser type cantilever beam K1, condenser type cantilever beam K2 are formed；Wherein, condenser type cantilever beam K1 one end is as LC bandpass filters
Input is simultaneously connected with planar inductor L1 one end, condenser type cantilever beam K1 other end connection ground；The planar inductor L1 other end
It is connected respectively with planar inductor L2, condenser type cantilever beam K2, planar inductor L2 other end ground connection, condenser type cantilever beam K2's is another
Output end of the one end as LC bandpass filters.
Fig. 5, Fig. 6 are respectively the schematic diagram and equivalent circuit diagram of LC bandstop filters in the present invention.
LC bandstop filters are by condenser type cantilever beam K4, condenser type cantilever beam K3 and planar inductor based on MEMS technology
L4, planar inductor L3 are formed；Wherein, input and and planar inductor of the condenser type cantilever beam K4 one end as LC bandstop filters
L4 one end is connected, and condenser type cantilever beam K4 other end connection ground, the planar inductor L4 other end connects condenser type and hanged respectively
Arm beam K3 and planar inductor L3, planar inductor L3 other end ground connection, the condenser type cantilever beam K3 other end are filtered as LC band resistances
The output end of ripple device；By controlling condenser type cantilever beam K3 and condenser type cantilever beam K4 drop-down driving voltage, it can adjust and connect
The capacitance size entered, and then the passband frequency domain of wave filter can be adjusted.
As shown in Figure 7,8, the structure chart of condenser type cantilever beam is as shown in Fig. 9,10 for the structure chart of planar inductor.
Planar inductor and condenser type cantilever beam are formed on great-great-grandfather's silicon substrate, and HR-Si substrate is the oxygen on silicon layer 16
Change and form one layer of SiO2Layer 17.Planar inductor has first paragraph transmission line 18, second segment respectively on HR-Si substrate upper surface both sides
Transmission line 19, inductance coil 20 by first connection support column 21, second connect support column 22 respectively with first paragraph transmission line 18
Second segment transmission line 19 connects and vacantly in the silicon nitride medium layer 23 and second segment transmission line on first paragraph transmission line 18
On 19.
The condenser type cantilever beam includes：HR-Si substrate, the 3rd section of transmission line 25, the 4th section of transmission line 26, cantilever beam
30 and pull-down electrode 24；
3rd section of transmission line 25, the 4th section of transmission line 26 are separately positioned on HR-Si substrate upper surface both ends, pull-down electrode
24 are arranged on HR-Si substrate upper surface, and between the 3rd section of transmission line 25 and the 4th section of transmission line 26, pull-down electrode
24 are provided with the first silicon nitride medium layer 28；3rd section of transmission line 25 is provided with anchor area 29, and the 4th section of transmission line 26 is towards drop-down
One end top of electrode 24 is provided with the second silicon nitride medium layer 27；Cantilever beam 30 is vacantly arranged on condenser type cantilever beam top, hangs
One end of arm beam 30 is connected with anchor area 29.
The cantilever beam receiver front end that the LNA of the internet of things oriented of present invention standing wave energy is collected is tied in traditional LNA
Structure both ends add standing wave energy collection structure.The microwave signal for inputting tuning network and exporting outside tuning network passband section can be
Input and output end form standing wave signal, and the passband frequency domain of two LC bandstop filters in the present invention can be tuned into and standing wave is believed
Number frequency domain it is identical, the standing wave energy at LNA both ends can be collected, and direct current signal is converted into using AC/DC modular converters, stored
In rechargeable battery, for the power supply to active device, the collection to standing wave energy is realized.Two LC tunable band-stop filters
Formed by two planar inductor L and two condenser type cantilever beams, by controlling the drop-down driving voltage of condenser type cantilever beam can
Capacitance by regulation access filter network is so as to adjusting the stopband frequency domain of wave filter centered on reception signal frequency.
Meet that the structure of conditions above can be considered that the cantilever beam that the standing wave energy of the internet of things oriented of the present invention is collected connects
By machine front end.
Described above is only the preferred embodiment of the present invention, it should be pointed out that：For the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (6)
1. the cantilever beam receiver front end that the LNA of internet of things oriented standing wave energy is collected, it is characterised in that including：Microwave day
Line (1), dc source (2), LNA (3), rechargeable battery (6), frequency mixer (12), the local oscillator that there is standing wave energy to collect
And intermediate-frequency filter (14) (13)；The LNA (3) collected with standing wave energy includes：Input tuning network (7), amplifier section
(8) tuning network (9), No.1 LC bandstop filters (4), No.1 AC/DC modules (5), No. two LC bandstop filters (10), are exported
With No. two AC/DC modules (11)；
Input tuning network (7), amplifier section (8), output tuning network (9) are sequentially connected to form LNA structures；Input tuning net
The input of network (7) is connected with microwave antenna (1), for receiving microwave signal；The output end of output tuning network (9) passes through mixed
Frequency device (12) is connected with intermediate-frequency filter (14), frequency mixer (12) while is connected with local oscillator (13)；No.1 LC band resistances are filtered
The input of ripple device (4) is connected with the input of input tuning network (7), and output end passes through No.1 AC/DC modules (5) and charging
Battery (6) input is connected；The input of No. two LC bandstop filters (10) is connected with the output end of output tuning network (9),
Output end is connected by No. two AC/DC modules (11) with rechargeable battery (6) input；The output end and direct current of rechargeable battery (6)
Power supply (2) input is connected；Dc source (2) is used to power to active device in receiver front end；
Input tuning network (7) and to export tuning network (9) structure identical, be LC bandpass filters, and LC bandpass filters
Passband frequency domain it is identical with the stopband frequency domain of No.1, No. two LC bandstop filters；
No.1 LC bandstop filters (4) are identical with No. two LC bandstop filters (10) structures, by condenser type cantilever beam K3, electric capacity
Formula cantilever beam K4 and planar inductor L3, planar inductor L4 are formed；Wherein, condenser type cantilever beam K4 one end is as LC bandstop filters
Input and be connected with planar inductor L4 one end, condenser type cantilever beam K4 other end connection ground, planar inductor L4's is another
One end connects condenser type cantilever beam K3 and planar inductor L3, planar inductor L3 other end ground connection, condenser type cantilever beam K3 respectively
Output end of the other end as LC bandstop filters；By the drop-down for controlling condenser type cantilever beam K3 and condenser type cantilever beam K4
Driving voltage, the capacitance size of access can be adjusted, and then the passband frequency domain of wave filter can be adjusted；
The receiver front end have collected the standing wave energy at LNA both ends, improve electromagnetic compatible environment, realize self-powered.
2. the cantilever beam receiver front end that the LNA of internet of things oriented according to claim 1 standing wave energy is collected, it is special
Sign is that the LC bandpass filters include：Planar inductor L1, planar inductor L2, condenser type cantilever beam K1, condenser type cantilever beam
K2；Wherein, condenser type cantilever beam K1 one end as LC bandpass filters input and be connected with planar inductor L1 one end, electricity
Appearance formula cantilever beam K1 other end connection ground；The planar inductor L1 other end respectively with planar inductor L2, condenser type cantilever beam K2
It is connected, planar inductor L2 other end ground connection, the output end of the condenser type cantilever beam K2 other end as LC bandpass filters.
3. the cantilever beam receiver front end that the LNA of internet of things oriented according to claim 2 standing wave energy is collected, it is special
Sign is that the planar inductor includes：HR-Si substrate, first paragraph transmission line (18), second segment transmission line (19), inductance coil
(20), the first connection support column (21) and the second connection support column (22)；First paragraph transmission line (18) and second segment transmission line
(19) HR-Si substrate upper surface both sides are respectively arranged at, first paragraph transmission line (18) upper surface is additionally provided with silicon nitride medium layer
(23)；Inductance coil (20) is vacantly arranged on planar inductor top, and passes through the first connection support column (21), the second connection branch
Dagger (22) is connected with first paragraph transmission line (18), second segment transmission line (19) respectively.
4. the cantilever beam receiver front end that the LNA of internet of things oriented according to claim 3 standing wave energy is collected, it is special
Sign is that the condenser type cantilever beam includes：HR-Si substrate, the 3rd section of transmission line (25), the 4th section of transmission line (26), cantilever
Beam (30) and pull-down electrode (24)；
3rd section of transmission line (25), the 4th section of transmission line (26) are separately positioned on HR-Si substrate upper surface both ends, pull-down electrode
(24) it is arranged on HR-Si substrate upper surface, and between the 3rd section of transmission line (25) and the 4th section of transmission line (26), under
Pulling electrode (24) is provided with the first silicon nitride medium layer (28)；3rd section of transmission line (25) is provided with anchor area (29), the 4th section of biography
Defeated line (26) is provided with the second silicon nitride medium layer (27) towards pull-down electrode (24) one end top；Cantilever beam (30) is vacantly arranged on
Condenser type cantilever beam top, one end of cantilever beam (30) are connected with anchor area (29).
5. the cantilever beam receiver front end that the LNA of internet of things oriented according to claim 3 standing wave energy is collected, it is special
Sign is that the passband of the LC bandpass filters is f1≤f≤f2, wherein,
6. the cantilever beam receiver front end that the LNA of internet of things oriented according to claim 5 standing wave energy is collected, it is special
Sign is that the passband of the LC bandstop filters is f≤f3Or f >=f4, wherein, f1=f3, f2=f4。
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| CN101752676A (en) * | 2008-12-05 | 2010-06-23 | 沈阳铁路信号工厂 | Transponder duplex multifrequency community antenna |
| CN104254958A (en) * | 2012-02-09 | 2014-12-31 | 胡玛沃克斯公司 | Energy harvesting system |
| CN104771140A (en) * | 2015-03-13 | 2015-07-15 | 江苏物联网研究发展中心 | RFID-based self-powered intelligent sensor |
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| CN2524433Y (en) * | 2002-02-06 | 2002-12-04 | 信息产业部电子第五十四研究所 | Multichannel radio signal transponder |
| CN101141120A (en) * | 2007-10-12 | 2008-03-12 | 东南大学 | Microelectronic mechanical variable bandpass filter and process for producing the same |
| CN101752676A (en) * | 2008-12-05 | 2010-06-23 | 沈阳铁路信号工厂 | Transponder duplex multifrequency community antenna |
| CN104254958A (en) * | 2012-02-09 | 2014-12-31 | 胡玛沃克斯公司 | Energy harvesting system |
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Application publication date: 20171124 |
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