CN105758453A - Downhole environment and life detector - Google Patents
Downhole environment and life detector Download PDFInfo
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- CN105758453A CN105758453A CN201610111956.8A CN201610111956A CN105758453A CN 105758453 A CN105758453 A CN 105758453A CN 201610111956 A CN201610111956 A CN 201610111956A CN 105758453 A CN105758453 A CN 105758453A
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- 238000004891 communication Methods 0.000 claims abstract description 28
- 239000007789 gas Substances 0.000 claims abstract description 20
- 239000001301 oxygen Substances 0.000 claims abstract description 14
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 14
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 13
- 230000005855 radiation Effects 0.000 claims description 63
- 238000002955 isolation Methods 0.000 claims description 24
- 239000002184 metal Substances 0.000 claims description 17
- 230000008878 coupling Effects 0.000 claims description 13
- 238000010168 coupling process Methods 0.000 claims description 13
- 238000005859 coupling reaction Methods 0.000 claims description 13
- 238000001514 detection method Methods 0.000 claims description 9
- 230000003071 parasitic effect Effects 0.000 claims description 6
- 230000010287 polarization Effects 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 abstract description 7
- 238000012360 testing method Methods 0.000 description 9
- 230000007613 environmental effect Effects 0.000 description 8
- 239000003245 coal Substances 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000013401 experimental design Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
-
- 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
- H01Q1/225—Supports; Mounting means by structural association with other equipment or articles used in level-measurement devices, e.g. for level gauge measurement
-
- 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
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
- H01Q1/521—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/24—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
The invention discloses a downhole environment and life detector including a host body. The host body is provided internally with a power supply cavity for storing a battery. The power supply cavity is provided internally with the battery. The host body is also provided internally with a circuit cavity, in which a monitoring circuit is disposed. The battery supplies power for the monitoring circuit. The monitoring circuit includes a CPU module, and further comprises a temperature sensor, an oxygen concentration detector, a gas concentration detector and a communication device which are in signal connection with the CPU module separately. By way of wireless communications, the downhole environment and life detector transmits environment data to the outside in real time, has a simple and reasonable structure, can effectively monitor the environment data in real time, and ensures the downhole safety.
Description
Technical field
The present invention relates to a kind of subsurface environment and life detectors.
Background technology
At present, rapid growth along with coal demand, coal industry obtains and develops on a large scale very much, but gas explosion accident occurs again and again, one of them critically important reason is that current gas-monitoring equipment exists drawback, in gas monitor, the instrument of domestic detection gas density is mainly Portable Gas Detector, simple in construction is easy to carry, but only carrier can know the gas density at this place at any time, staff in coal mine does not know that the gas density situation of underground coal mine, but owing to subsurface environment is complicated, and workman tends not to real-time monitoring of environmental data when carrying, it is thus desirable to one can be fixed on down-hole, and the detector of environmental data is provided in real time.
Summary of the invention
It is an object of the invention to overcome disadvantages described above, it is provided that a kind of can monitor in real time, simple in construction, safe and reliable underground coal mine environmental monitor.
For achieving the above object, the concrete scheme of the present invention is as follows: a kind of subsurface environment and life detectors, includes host main body, is provided with the power source cavity for storing battery, is provided with battery in described power source cavity in described host main body；Being additionally provided with circuit chamber in described host main body, described circuit intracavity is provided with observation circuit, and described battery is that observation circuit is powered；Described observation circuit includes CPU module, also include be connected with CPU module respectively signal temperature sensor, oxygen concentration detector, gas density detector, communicator；Described communicator is for transferring out the signal that temperature sensor, oxygen concentration detector, gas density detector collect；Described temperature sensor, oxygen concentration detector, gas density detector are respectively arranged on host main body lateral wall；Also including the connecting rod being located at host main body lower curtate, the free end of described connecting rod is provided with isolation flaggy, and described isolation flaggy bottom is provided with antenna stack；Described communicator includes communication chip and communication antenna, and described communication antenna is located in antenna stack；Described host main body top is provided with hangers.
Wherein, described communication antenna includes the pcb board of circle, and the one side of pcb board is provided with microstrip antenna；
Described microstrip antenna include two groups, often group two oscillator unit；Upper and lower two oscillator unit are one group, are used for radiating vertical polarization signal, and two, left and right oscillator unit is one group, for radiation level polarized signal；Described pcb board central authorities are provided with square hollow hole；
Each oscillator unit includes radiation base, and two free ends on radiation base have all obliquely extended from the first radiating side, are formed horn-like between two the first radiating side；The free end of two the first radiating side all extends the second radiating side, be arranged in parallel between two the second radiating side；The free end of two the second radiating side has all obliquely extended from the 3rd radiating side, and the free end of two the 3rd radiating side all extends to the other side short radiating side；
Also including the radiation base arm in several fonts, the both sides of radiation base arm are extended two the first radiation arms, is formed horn-like between two the first radiation arms；The free end of two the first radiation arms all extends the second radiation arm, be arranged in parallel between two the second radiation arms；The free end of two the second radiation arms has all obliquely extended from the 3rd radiation arm, and described 3rd radiation arm is broadening gradually to free end from the one end near the second radiation arm, is provided with the 4th radiation arm between two the 3rd radiation arms；It is electrically connected with the first linking arm between each 3rd radiation arm and the 3rd adjacent radiating side；
The top of described radiation base arm is provided with the parasitic oscillator arms in convex shape, also includes feeder panel, and described feeder panel is electrically connected with the second linking arm with parasitic oscillator arms；
The another side of described pcb board is provided with four power feed hole corresponding with feeder panel.
Wherein, each described second oscillator arms is all extended to feeder panel side T-shaped coupling bar.
Wherein, the lever arm of described T-shaped coupling bar is provided with multiple circular aperture.
Wherein, the quantity of the circular aperture on each T-shaped coupling bar is 6.
Wherein, described 4th radiation arm is provided with laciniation away from the side of feeder panel.
Wherein, it is filled with quasiconductor in circular aperture.
Wherein, the edge of pcb board is provided with ring dress isolation strip.
Wherein, also including the metal division board being located in isolation flaggy, described metal division board is circular, and described metal division board is provided with four clearance holes corresponding with oscillator unit respectively.
Wherein, described observation circuit also includes memory element, and described memory element is used for the information of real time record temperature sensor, oxygen concentration detector, gas density detector；
Wherein, described observation circuit also includes GPS locating module, and described GPS locating module is connected with CPU module signal；
Wherein, described observation circuit also includes life detection module, and described life detection module is connected with CPU module signal；
Wherein, it is additionally provided with closed LED below described antenna stack.
The invention have the benefit that the mode by radio communication, by environmental data real-time Transmission to extraneous, simple and reasonable, can monitoring of environmental data effectively in real time, it is ensured that downhole safety.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the schematic block circuit diagram of the observation circuit of the present invention；
Fig. 3 is the top view of the communication antenna of the present invention；
Fig. 4 is the upward view of the communication antenna of the present invention
Fig. 5 is the metal division board top view of the present invention；
Fig. 6 is the structural representation of the oscillator unit of the present invention
Fig. 7 is the frequency range emulation testing figure that communication antenna and the metal division board of the present invention does not conform to timing；
Fig. 8 is the communication antenna frequency range emulation testing figure with the conjunction timing of metal division board of the present invention；
Fig. 9 is the directional diagram of the communication antenna of the present invention；
Description of reference numerals in Fig. 1 to Fig. 9:
A1-host main body；A11-temperature sensor；A12-oxygen concentration detector；A13-gas density detector；A14-life detection module；A2-hangers；A3-power source cavity；A4-circuit chamber；A5-connecting rod；A6-isolates flaggy；A7-antenna stack；The closed LED of a8-；
1-PCB plate；11-ring dress isolation strip；12-hollow hole；13-power feed hole；
2-metal division board；21-clearance hole；
31-radiates base；32-the first radiating side；33-the second radiating side；34-the 3rd radiating side；The short radiating side of 35-；
41-radiates base arm；42-the first radiation arm；43-the second radiation arm；44-the 3rd radiation arm；45-the 4th radiation arm；46-parasitism oscillator arms；47-feeder panel；
51-the first linking arm；52-T shape coupling bar；53-circle aperture.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation, is not that the practical range of the present invention is limited thereto.
As shown in Figures 1 to 9, a kind of subsurface environment described in the present embodiment and life detectors, include host main body a1, be provided with the power source cavity a3 for storing battery in described host main body a1, in described power source cavity a3, be provided with battery；Being additionally provided with circuit chamber a4 in described host main body a1, be provided with observation circuit in described circuit chamber a4, described battery is that observation circuit is powered；Described observation circuit includes CPU module, also include be connected with CPU module respectively signal temperature sensor a11, oxygen concentration detector a12, gas density detector a13, communicator；Described communicator is for transferring out the signal that temperature sensor a11, oxygen concentration detector a12, gas density detector a13 collect；Described temperature sensor a11, oxygen concentration detector a12, gas density detector a13 are respectively arranged on host main body a1 lateral wall；Also including the connecting rod a5 being located at host main body a1 lower curtate, the free end of described connecting rod a5 is provided with isolation flaggy a6, and described isolation flaggy a6 bottom is provided with antenna stack a7；Described communicator includes communication chip and communication antenna, and described communication antenna is located in antenna stack a7；Described host main body a1 top is provided with hangers a2；Hangers a2 may be used for being hung on the crag in well by detector easily；Described temperature sensor a11, oxygen concentration detector a12, gas density detector a13 gather signal, are then transmit to CPU module and process, and signal is transferred out by CPU module again.By the mode of radio communication, by environmental data real-time Transmission to extraneous, simple and reasonable, can monitoring of environmental data effectively in real time, it is ensured that downhole safety, due to relatively deep in well, therefore communicator needs good antenna performance.
In order to improve subsurface environment monitor communication performance further, it is necessary to promote communication antenna performance, therefore a kind of subsurface environment and life detectors described in the present embodiment, described communication antenna includes the pcb board 1 of circle, and the one side of pcb board 1 is provided with microstrip antenna；Described microstrip antenna include two groups, often group two oscillator unit；Upper and lower two oscillator unit are one group, are used for radiating vertical polarization signal, and two, left and right oscillator unit is one group, for radiation level polarized signal；Described pcb board 1 central authorities are provided with square hollow hole 12；Each oscillator unit includes radiation base 31, and two free ends on radiation base 31 have all obliquely extended from the first radiating side 32, are formed horn-like between two the first radiating side 32；The free end of two the first radiating side 32 all extends the second radiating side 33, be arranged in parallel between two the second radiating side 33；The free end of two the second radiating side 33 has all obliquely extended from the 3rd radiating side 34, and the free end of two the 3rd radiating side 34 all extends to the other side short radiating side 35；Also including the radiation base arm 41 in several fonts, the both sides of radiation base arm 41 are extended two the first radiation arms 42, is formed horn-like between two the first radiation arms 42；The free end of two the first radiation arms 42 all extends the second radiation arm 43, be arranged in parallel between two the second radiation arms 43；The free end of two the second radiation arms 43 has all obliquely extended from the 3rd radiation arm 44, and described 3rd radiation arm 44 is broadening gradually to free end from the one end near the second radiation arm 43, is provided with the 4th radiation arm 45 between two the 3rd radiation arms 44；It is electrically connected with the first linking arm 51 between each 3rd radiation arm 44 and the 3rd adjacent radiating side 34；The top of described radiation base arm 41 is provided with the parasitic oscillator arms 46 in convex shape, also includes feeder panel 47, and described feeder panel 47 is electrically connected with the second linking arm with parasitic oscillator arms 46；The another side of described pcb board 1 is provided with four power feed hole 13 corresponding with feeder panel 47.Holding wire, by power feed hole 13 feed coupling, by the design of rational radiating element, improves radiation current, thus improving radiation characteristic.By being not less than the microstrip circuit structural design of 600 times, and by being not less than under 600 l-G simulation tests and parameter adjustment, finally determine above-mentioned antenna structure, this antenna possesses wider frequency range and good isolation and directivity and gain performance, possess good communication performance, can further improve the communication capacity of power distribution cabinet.
A kind of subsurface environment and life detectors described in the present embodiment, also include the metal division board 2 being located in isolation flaggy a6, and described metal division board 2 is circular, and described metal division board 2 is provided with four clearance holes 21 corresponding with oscillator unit respectively.In actual test, when removing this structural metal division board 22 or placing common metal division board 22, such as Fig. 7, this beamwidth of antenna available frequency range is still up to 1.7GHz to 2.65GHz；Substantially meeting the requirement of communications band, its gain is also higher, and in frequency band, average gain is more than 8.952dBi；Meet actually used needs；The design of this shape division board is also drawn by emulation and continuous EXPERIMENTAL DESIGN, wherein, screw stereo antenna is included when this metal division board 22 being placed other prior art antennas and coordinating, its matching is not high, and isolation performance strengthens inconspicuous, when testing ordinary antennas, this metal division board 22 in cooperation, average gain increases 0.01-0.15dBi or does not increase, and isolation performance is constant, and frequency range is without change；And the emulation before reality test with test is appreciated that, test when the communication antenna in this programme coordinates with the division board of this programme, the bandwidth of the communication antenna of this programme, isolation, gain aspect all exceed Antenna Design when being not added with division board, the simulation value such as Fig. 8 after wherein coordinating.This integrated antenna system bandwidth available frequency range has reached 1.6GHz to 2.85GHz；Its gain also substantially increases, and in frequency band, average gain is more than 9.4dBi, compares rising about 0.3dBi；If additionally isolation in its isolation figure frequency band, isolation performance better, such as Fig. 7, can be seen that in S3 isolation is more than 25.5dB in frequency range.Its directivity, as described in Figure 9, it is omni-directional antenna.
A kind of subsurface environment described in the present embodiment and life detectors, each described second oscillator arms is all extended to feeder panel 47 side T-shaped coupling bar 52；T-shaped coupling bar 52 can effectively strengthen decoupling performance, promotes gain and improves standing-wave ratio performance.A kind of power distribution cabinet described in the present embodiment, the lever arm of described T-shaped coupling bar 52 is provided with multiple circular aperture 53.A kind of subsurface environment described in the present embodiment and life detectors, the quantity of the circular aperture 53 on each T-shaped coupling bar 52 is 6.Being found by emulation experiment and actual test, the aperture of this quantity can be effectively increased the decoupling performance of T-shaped coupling bar 52；
A kind of subsurface environment described in the present embodiment and life detectors, described 4th radiation arm 45 is provided with laciniation away from the side of feeder panel 47.This structure can be effectively increased its isolation performance.
A kind of subsurface environment described in the present embodiment and life detectors, be filled with quasiconductor in circular aperture 53.A kind of subsurface environment described in the present embodiment and life detectors, the edge of pcb board 1 is provided with ring dress isolation strip 11.Ring dress isolation strip 11 can effectively strengthen isolation performance, improves the electric property of antenna.
A kind of subsurface environment described in the present embodiment and life detectors, described observation circuit also includes memory element, described memory element for real time record temperature sensor a11, oxygen concentration detector a12, gas density detector a13 information.When communicator goes wrong time, it is possible to continual record environmental data, conveniently file.
A kind of subsurface environment described in the present embodiment and life detectors, described observation circuit also includes GPS locating module, and described GPS locating module is connected with CPU module signal；May be used for detection detector location, easy-to-look-up.
A kind of subsurface environment described in the present embodiment and life detectors, described observation circuit also includes life detection module a14, and described life detection module a14 is connected with CPU module signal；When accident occurs, detector can be served as, monitor whether to have some casualties.
A kind of subsurface environment described in the present embodiment and life detectors, be additionally provided with closed LED a8 below described antenna stack a7.Not only realize detecting function, moreover it is possible to realize illumination, kill two birds with one stone.
The above is only a preferred embodiment of the present invention, therefore all equivalences done according to the structure described in present patent application scope, feature and principle change or modify, and are included in the protection domain of present patent application.
Claims (9)
1. a subsurface environment and life detectors, it is characterised in that ##: include host main body (a1), are provided with the power source cavity (a3) for storing battery, are provided with battery in described power source cavity (a3) in described host main body (a1)；Being additionally provided with circuit chamber (a4) in described host main body (a1), be provided with observation circuit in described circuit chamber (a4), described battery is that observation circuit is powered；Described observation circuit includes CPU module, also include be connected with CPU module respectively signal temperature sensor (a11), oxygen concentration detector (a12), gas density detector (a13), communicator；Described communicator is for transferring out the signal that temperature sensor (a11), oxygen concentration detector (a12), gas density detector (a13) collect；Described temperature sensor (a11), oxygen concentration detector (a12), gas density detector (a13) are respectively arranged on host main body (a1) lateral wall；Also including the connecting rod (a5) being located at host main body (a1) lower curtate, the free end of described connecting rod (a5) is provided with isolation flaggy (a6), and described isolation flaggy (a6) bottom is provided with antenna stack (a7)；Described communicator includes communication chip and communication antenna, and described communication antenna is located in antenna stack (a7)；Described host main body (a1) top is provided with hangers (a2)；
Described observation circuit also includes life detection module (a14), and described life detection module (a14) is connected with CPU module signal.
2. a kind of subsurface environment according to claim 1 and life detectors, it is characterised in that: described communication antenna includes the pcb board (1) of circle, and the one side of pcb board (1) is provided with microstrip antenna；
Described microstrip antenna include two groups, often group two oscillator unit；Upper and lower two oscillator unit are one group, are used for radiating vertical polarization signal, and two, left and right oscillator unit is one group, for radiation level polarized signal；Described pcb board (1) central authorities are provided with square hollow hole (12)；
Each oscillator unit includes radiation base (31), and two free ends of radiation base (31) have all obliquely extended from the first radiating side (32), are formed horn-like between two the first radiating side (32)；The free end of two the first radiating side (32) all extends the second radiating side (33), be arranged in parallel between two the second radiating side (33)；The free end of two the second radiating side (33) has all obliquely extended from the 3rd radiating side (34), and the free end of two the 3rd radiating side (34) all extends to the other side short radiating side (35)；
Also including the radiation base arm (41) in several fonts, the both sides of radiation base arm (41) are extended two the first radiation arms (42), is formed horn-like between two the first radiation arms (42)；The free end of two the first radiation arms (42) all extends the second radiation arm (43), be arranged in parallel between two the second radiation arms (43)；The free end of two the second radiation arms (43) has all obliquely extended from the 3rd radiation arm (44), described 3rd radiation arm (44) is broadening gradually to free end from the one end near the second radiation arm (43), is provided with the 4th radiation arm (45) between two the 3rd radiation arms (44)；It is electrically connected with the first linking arm (51) between each 3rd radiation arm (44) and the 3rd adjacent radiating side (34)；
The top of described radiation base arm (41) is provided with the parasitic oscillator arms (46) in convex shape, also includes feeder panel (47), and described feeder panel (47) is electrically connected with the second linking arm with parasitic oscillator arms (46)；
The another side of described pcb board (1) is provided with four power feed hole (13) corresponding with feeder panel (47).
3. a kind of subsurface environment according to claim 2 and life detectors, it is characterised in that: each described second oscillator arms is all extended to feeder panel (47) side T-shaped coupling bar (52).
4. a kind of subsurface environment according to claim 3 and life detectors, it is characterised in that: the lever arm of described T-shaped coupling bar (52) is provided with multiple circular aperture (53).
5. a kind of subsurface environment according to claim 4 and life detectors, it is characterised in that: the quantity of the circular aperture (53) on each T-shaped coupling bar (52) is 6.
6. a kind of subsurface environment according to claim 2 and life detectors, it is characterised in that: described 4th radiation arm (45) is provided with laciniation away from the side of feeder panel (47).
7. a kind of subsurface environment according to claim 3 and life detectors, it is characterised in that: it is filled with quasiconductor in circular aperture (53).
8. a kind of subsurface environment according to claim 2 and life detectors, it is characterised in that: the edge of pcb board (1) is provided with ring dress isolation strip (11).
9. a kind of subsurface environment according to claim 2 and life detectors, it is characterized in that: also include the metal division board (2) being located in isolation flaggy (a6), described metal division board (2) is circular, and described metal division board (2) is provided with four clearance holes corresponding with oscillator unit respectively (21).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610111956.8A CN105758453A (en) | 2016-02-29 | 2016-02-29 | Downhole environment and life detector |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610111956.8A CN105758453A (en) | 2016-02-29 | 2016-02-29 | Downhole environment and life detector |
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| CN105758453A true CN105758453A (en) | 2016-07-13 |
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| CN201610111956.8A Withdrawn CN105758453A (en) | 2016-02-29 | 2016-02-29 | Downhole environment and life detector |
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| CN110233340A (en) * | 2019-06-14 | 2019-09-13 | 大连海事大学 | A kind of dual-band and dual-polarization 5G antenna loading the rectangular patch that cracks |
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Application publication date: 20160713 |