CN102354794A - Omnidirectional cylindrical dipole antenna for underground earth-probing radars - Google Patents
Omnidirectional cylindrical dipole antenna for underground earth-probing radars Download PDFInfo
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- CN102354794A CN102354794A CN2011101631375A CN201110163137A CN102354794A CN 102354794 A CN102354794 A CN 102354794A CN 2011101631375 A CN2011101631375 A CN 2011101631375A CN 201110163137 A CN201110163137 A CN 201110163137A CN 102354794 A CN102354794 A CN 102354794A
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Abstract
The invention belongs to an omnidirectional cylindrical dipole antenna for underground earth-probing radars, which comprises tubular monopole antenna cylinders, conical antenna heads, loading resistors, corresponding compression springs, inter-section fixing sleeves, supporting tubes, nut sleeves, connecting and fixing sleeves and coaxial cables, the loading resistors and the corresponding compression springs are respectively arranged in the holes of each two end surfaces between the antenna heads and the antenna sections and between the antenna sections, and monopole antennas are formed by the nut sleeves. Since the invention arranges the loading resistors between the antenna heads and the antenna sections and between the antenna sections to change the distribution of the current of the surface of the antenna, not only is the performance of the antenna improved, but also the production technique is simplified, the antenna can be matched with a borehole radar to operate under the conditions of center frequency equal to about 100m and bandwidth greater than or equal to 120m, the obtained waveform is neat, the main-to-side lobe ratio is distinct, tailing is tiny, and the waveform is stable; and consequently, the antenna is characterized in that: the comprehensive performance is high, the structure is simple, the diameter is small, the production cost is low, and the antenna can be matched with the borehole radar under the conditions of low frequency band and high bandwidth, and can effectively increase the performance, detection range and efficiency of the borehole radar.
Description
Technical field
The invention belongs to a kind of and the supporting dipole antenna of using of detection radar, the supporting broad band low frequency omnidirectional cylindricality dipole antenna that in the geological drilling well, uses and adopt resistance to load of particularly a kind of and earth-probing radar; This antenna can be gone into underground activities through the geological drilling well depth, and with supporting GEOLOGICAL ENVIRONMENT SURVEY, the resource exploration etc. of being used for of earth-probing radar.
Background technology
Ground penetrating radar is a kind of Detection Techniques of GEOPHYSICS FOR SHALLOW LAYER efficiently, and it utilizes the difference of underground medium electrical parameter through emission high-frequency impulse electromagnetic wave, analyzes and infers underground medium structure and material property according to characteristics such as the amplitude of echo, phase places.The general geophysical method of adopting of geological radar all on the face of land or surface to be measured carry out; Yet because the inner structure more complicated of body underground or to be measured; The data that only rely on from these methods to be obtained are difficult to accurately infer geology or information such as resource characteristics to be measured, orientation, use the boring radar and carry out more the down-hole of deep layer and survey and just become a kind of necessary means.Antenna directly has influence on the investigative range and the precision of radar as the core component of boring radar imagery system.For the waveform that obtains being easy to discerning, fidelity is good, need antenna to have wider bandwidth; Simultaneously operating frequency of antenna is low more, and propagation distance is just far away in ground, radar coverage is just big more, but if bandwidth is narrower, then waveform is prone to produce distortion, thereby low-frequency antenna just becomes a kind of desirable selection under the enough situation of bandwidth.At publication number is that CN101908669A, name are called and disclose a kind ofly mainly by first, second, third, fourth branch in " four-branch multi-frequency cylindrical dipole antenna " patent documentation, reveals the copper district, the antenna that feed constitutes.Reveal the copper district and be a hollow copper bar (pipe) and feed is thin real copper rod; First, second branch is positioned at below the 3rd, the 4th branch; Feed links to each other through circuit and three, four branches in the 3rd, the 4th branch; Reveal the copper district and link to each other through circuit and, two branches in one, two branches, dew copper district also with the first branch top and second branch's lower ends.Because feed connects three, four branches simultaneously, so three, four branch into parallel-connection structure; Reveal the copper district and connect one, two branches again simultaneously, so one, two branches also are parallel-connection structure.To between the 2500M, the higher and bandwidth of operating frequency is 50-60M only at 700M for this operating frequency of antenna, and adopts the structure of circuit and four corresponding connections of branch, and feed and each branch can be mated better, helps the expansion of the beamwidth of antenna; But the 4th branch adopts helicoidal structure; When having increased antenna length, also brought the partial inductance effect; Though in addition through increasing the effect that branches has played to a certain extent increases bandwidth; But the fluctuation (scope) of S11 (antenna feed point voltage reflection coefficient) is also very big in its bandwidth simultaneously; Be that each frequency place emittance difference is bigger; This will cause the time domain waveform distortion of aerial radiation, can not with the supporting use of pulse radar; In addition, this antenna is that active antenna, structure are complicated, also is difficult to and the supporting application of boring radar.
Summary of the invention
The objective of the invention is to defective to the background technology existence; A kind of down-hole of research and design earth-probing radar is with omnidirectional's cylindricality dipole antenna; Simplifying antenna structure, to reduce production costs, can be at low-frequency range and enough bandwidth condition down with the auxiliary work of geotechnical boring radar, with the investigative range of raising in rock soil medium; Thereby reach the purposes such as performance, investigative range and efficient that antenna structure simply, effectively improves geological radar.
Solution of the present invention is all to adopt metal cylinder as each antenna section in two (root) tubular monopole antenna cylinder in the dipole antenna of the present invention; Aerial head then adopts the conical head of band centre bore and is divided into the inner of two monopole antenna cylinders, and all the rear portion is the cylindrical body identical with the antenna section diameter to the front end face of two conical heads with antenna axis (center line) is vertical; Direct-axis is to correspondingly respectively being provided with one group of seat hole, being used to install loading resistor between each antenna section and on the both ends of the surface between antenna section and the aerial head; Be placed in each antenna section and aerial head in (root) monopole antenna body on (interior) stay pipe successively respectively during assembling and between each antenna section, reach pack in the seat hole between front end antenna section and the aerial head compression spring, resistance and internode fixed cover each antenna section and aerial head are connected into one and fix, form a tubulose monopole antenna through nut sleeve; At last the aerial head of two (root) monopole antennas axially is tightened to one through connecting fixed cover opposite to each other at interval, stay pipe and the aerial head centre bore endoporus with coaxial cable warp one monopole antenna cylinder before fixing penetrates, the center line of coaxial cable and outside (layer) lead be fastenedly connected with two aerial heads respectively.Therefore; Omnidirectional of the present invention cylindricality dipole antenna comprises two (root) monopole antennas that contain monopole antenna cylinder and aerial head respectively and is connected fixed cover; (be used to connect feed) coaxial cable; Key is that each monopole antenna cylinder is the tubular cylinder that adopts each tubulose antenna section to be in series; Two aerial heads are the conical head of anterior band centre bore; And the rear portion is the conical antenna head of cylindrical body; Each conical antenna head is located at the inner of two tubular cylinders of monopole antenna respectively; In two tubular cylinders of monopole antenna and aerial head, also be provided with a stay pipe; To being respectively equipped with one group of seat hole that is used to install loading resistor, each organizes loading resistor and corresponding compression spring is embedded in respectively in the corresponding seat hole at direct-axis between aerial head and the antenna section and on the both ends of the surface between each antenna section; And adjacent both ends of the surface are isolated each other; All be series on the stay pipe and successively between antenna section and the aerial head, between each antenna section, together with loading resistor and compression spring and fix, to form (root) monopole antenna through nut sleeve through corresponding internode fixed cover; Through connecting fixed cover two monopole antenna heads axially are fixed into one in opposite directions at last, and the center line of coaxial cable is fixedly connected the back respectively, draws through arbitrary stay pipe inner chamber with the conical antenna head of two monopole antennas with outer (layer) lead.
Above-mentioned at direct-axis between aerial head and the antenna section and on the both ends of the surface between each antenna section to being respectively equipped with one group of seat hole that is used to install loading resistor, every group of seat hole count is that each two corresponding seat hole is positioned on the same axis on 3-6, adjacent both ends face.The said tubular cylinder of monopole antenna and the aerial head of containing is at two interior monopole antennas, and wherein each monopole antenna comprises 1 aerial head and the monopole antenna of being made up of 5-9 tubulose antenna section.Said monopole antenna; The resistance that when each monopole antenna adopts 1 aerial head and 7 antenna sections, between aerial head and the antenna section, is loaded is 4-6 ohm; The resistance that is loaded between each antenna section is followed successively by 8-10 ohm, 14-18 ohm, 28-32 ohm, 44-52 ohm, 65-75 ohm, 90-110 ohm from the inside to the outside, reaches the resistance that is loaded between each antenna section between above aerial head and the antenna section and is the parallel resistance value.Said connection fixed cover comprises is located at the cylindrical hole that connects fixed cover inner chamber middle part, and is divided into these cylindrical hole two ends to the taper hole that connects the fixed cover both ends of the surface.
The present invention is adopting the method for loading resistor to change the antenna surface CURRENT DISTRIBUTION and need not fill medium between the aerial head of two (root) monopole antennas and the antenna section and between each antenna section; Improve the performance of antenna effectively and simplified production technology simultaneously; Make it can be under low-frequency range and enough bandwidth condition survey farther distance with the auxiliary work of geotechnical boring radar and in rock soil medium; Geology, resource information in the wide region more be can obtain through single boring, thereby radar detection efficient and the investigative range in rock soil medium improved greatly; Omnidirectional of the present invention cylindricality dipole antenna can be in centre frequency about 100M; Under the condition of bandwidth >=120M with the auxiliary work of geotechnical boring radar; The radiation waveform that obtains is clean and tidy, major-minor than obviously, hangover is very little, when dielectric constant of rock and conductivity variations, its waveform is also more stable; Thereby omnidirectional of the present invention cylindricality dipole antenna have antenna good combination property, simple in structure, diameter is little; Production cost is low; Can be under low-frequency range and enough bandwidth condition and the auxiliary work of geotechnical boring radar, and can effectively improve the characteristics such as performance, investigative range and efficient of geological radar.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is S11 (antenna feed point voltage reflection coefficient) the curvilinear coordinate figure of specific embodiment of the invention simulation run;
Fig. 3 is the time domain electric field oscillogram (coordinate diagram) of the aerial radiation of specific embodiment of the invention simulation run.
Among the figure: 1. (tubular) antenna section, 2. stay pipe, 3. internode fixed cover; 4. loading resistor, 5. compression spring, 6. aerial head, 6-1. (aerial head) centre bore; 7. connection fixed cover, 8-1. coaxial cable center line, 8-2. coaxial cable outer (layer) lead, 9. nut sleeve.
Embodiment
This execution mode uses omnidirectional's cylindricality dipole antenna to be example with every (root) monopole antenna long (half oscillator that is antenna is long) 1065mm, the down-hole earth-probing radar that comprises 7 antenna sections 1 and an aerial head 6: each aerial head 6 axial long 50mm; The wherein partly long 30mm of conical head, upper base diameter of phi 20mm, the diameter of phi of going to the bottom 40mm, center-hole diameter Φ 8mm; The inside and outside footpath of rear barrel body is respectively Φ 30mm and Φ 40mm, and material is a stainless steel; Each body shape antenna section 1 is axially long to be 140mm, inside and outside footpath is respectively Φ 30mm and Φ 40mm, and material is for being stainless steel also; On the adjacent end face of aerial head 6 rear end faces and each antenna section 1 all at interval 90 ° 4 diameters are set are Φ 3mm, are the seat hole that is used to install loading resistor 4 of 7.5mm deeply; Two stay pipes 2, every long 1035mm, inside and outside footpath is respectively Φ 20mm and Φ 30mm, and material is plastics; The length of each loading resistor 4 is that 10mm, diameter are Φ 2.5mm; This execution mode at direct-axis between aerial head 6 and the antenna section 1 and on the both ends of the surface between each antenna section 1 to establishing 4 resistance respectively; Wherein: the resistance of 4 resistance is respectively 20 Ω between aerial head 6 and the antenna section 1, respectively is 36 Ω, 64 Ω, 120 Ω, 192 Ω, 280 Ω, 400 Ω by each resistance in set every group (4) resistance on the both ends of the surface of order between each antenna section 1 from inside to outside thereafter; The inside and outside footpath of internode fixed cover 3 is respectively Φ 30mm and Φ 50mm; Outer ring portion is axially long for 15mm, wherein embed the thick 5mm of section axial between the both ends of the surface; Material is an ambroin, on it also at interval 90 ° of through holes that 4 diameters are set is Φ 3mm be used for fixing loading resistor 4; Compression spring 5 diameter of phi 2.5mm, long 10mm (length after the compression is 5mm); Connect fixed cover 7 axial long 104mm, external diameter Φ 50mm, the inner diameter of phi 20mm of the taper hole that middle part internal diameter Φ 20mm, long 40mm, two ends cooperate with conical head, outer end diameter of phi 40mm; During assembling at first with aerial head 6, each antenna section 1, internode fixed cover 3, compression spring 5 by to successively be placed on the stay pipe 2 and pack into successively compression spring 5 and each loading resistor 4 after, adopt nut sleeve that each antenna section etc. is dressed up a monopole antenna with stay pipe 2 fixation group; Then with the termination of outer (layer) lead 8-2 of coaxial cable center line 8-1 and coaxial cable respectively with two monopole antennas on aerial head 6 fix; At last the aerial head on two monopole antennas 6 inserted in the taper hole at fixed cover 7 two ends respectively, be adhesively fixed, promptly make the said down-hole of this execution mode earth-probing radar with omnidirectional's cylindricality dipole antenna.
This antenna is contained in the pvc pipe of external diameter 90mm, internal diameter 76.6; In centre frequency 100M, bandwidth 120M, the excitation of employing bottom width 10ns single order Gaussian pulse; Be to carry out simulation run under 8 the rock background at dielectric constant, wherein: accompanying drawing 2, accompanying drawing 3 promptly are respectively the time domain electric field oscillogram (coordinate diagram) of S11 (antenna feed point voltage reflection coefficient) curve chart (coordinate diagram) and the aerial radiation of the cylindricality dipole antenna simulation run of this execution mode gained omnidirectional.Therefrom can find out:
S11 curve (referring to accompanying drawing 2) is very smooth, and fluctuation is 2.5dB only in the 40M-500M frequency range, and the fluctuation in the 40M-200M scope only is 1.24dB;
And the electric field waveform (referring to Fig. 3) of aerial radiation is clean and tidy, and less than 1/30 of main peak, so waveform is identified major-minor easily than the later hangover of obviously (ratio is 1.78), main peak 10ns.
Claims (5)
1. a down-hole earth-probing radar is with omnidirectional's cylindricality dipole antenna; Comprise two monopole antennas that contain monopole antenna cylinder and aerial head respectively and be connected fixed cover; Coaxial cable; It is characterized in that each monopole antenna cylinder is the tubular cylinder that adopts each tubulose antenna section to be in series; Two aerial heads are the conical head of anterior band centre bore; And the rear portion is the conical antenna head of cylindrical body; Each conical antenna head is located at the inner of two tubular cylinders of monopole antenna respectively; In two tubular cylinders of monopole antenna and aerial head, also be provided with a stay pipe; To being respectively equipped with one group of seat hole that is used to install loading resistor, each organizes loading resistor and corresponding compression spring is embedded in respectively in the corresponding seat hole at direct-axis between aerial head and the antenna section and on the both ends of the surface between each antenna section; And adjacent both ends of the surface are isolated each other; All be series on the stay pipe and successively between antenna section and the aerial head, between each antenna section, together with loading resistor and compression spring and fix, to form a monopole antenna through nut sleeve through corresponding internode fixed cover; Through connecting fixed cover two monopole antenna heads axially are fixed into one in opposite directions at last, and the center line of coaxial cable is fixedly connected the back respectively, draws through arbitrary stay pipe inner chamber with the conical antenna head of two monopole antennas with outer conductor.
2. press the said down-hole of claim 1 earth-probing radar with omnidirectional's cylindricality dipole antenna; It is characterized in that said at direct-axis between aerial head and the antenna section and on the both ends of the surface between each antenna section to being respectively equipped with one group of seat hole that is used to install loading resistor, every group of seat hole count is that each two corresponding seat hole is positioned on the same axis on 3-6, adjacent both ends face.
3. press the said down-hole of claim 1 earth-probing radar with omnidirectional's cylindricality dipole antenna, it is characterized in that said two monopole antennas, wherein each monopole antenna comprises 1 aerial head and the monopole antenna of being made up of 5-9 tubulose antenna section.
4. press claim 1 or 3 said down-hole earth-probing radars with omnidirectional's cylindricality dipole antenna; It is characterized in that said monopole antenna; The resistance that when each monopole antenna adopts 1 aerial head and 7 antenna sections, between aerial head and the antenna section, is loaded is 4-6 ohm; The resistance that is loaded between each antenna section is followed successively by 8-10 ohm, 14-18 ohm, 28-32 ohm, 44-52 ohm, 65-75 ohm, 90-110 ohm from the inside to the outside, reaches the resistance that is loaded between each antenna section between above aerial head and the antenna section and is the parallel resistance value.
5. press the said down-hole of claim 1 earth-probing radar with omnidirectional's cylindricality dipole antenna; It is characterized in that said connection fixed cover comprises the cylindrical hole of being located at connection fixed cover inner chamber middle part, and be divided into these cylindrical hole two ends to the taper hole that connects the fixed cover both ends of the surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110163137 CN102354794B (en) | 2011-06-17 | 2011-06-17 | Omnidirectional cylindrical dipole antenna for underground earth-probing radars |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110163137 CN102354794B (en) | 2011-06-17 | 2011-06-17 | Omnidirectional cylindrical dipole antenna for underground earth-probing radars |
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| Publication Number | Publication Date |
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| CN102354794A true CN102354794A (en) | 2012-02-15 |
| CN102354794B CN102354794B (en) | 2013-11-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201110163137 Expired - Fee Related CN102354794B (en) | 2011-06-17 | 2011-06-17 | Omnidirectional cylindrical dipole antenna for underground earth-probing radars |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103076637A (en) * | 2013-01-09 | 2013-05-01 | 山东大学 | Delivery transmission device and delivery transmission method for tunnel single-hole geological radar imaging antenna |
| CN104810626A (en) * | 2015-03-02 | 2015-07-29 | 同济大学 | In-hole dual-frequency ground penetrating radar antenna |
| CN105676007A (en) * | 2016-02-17 | 2016-06-15 | 北京森馥科技股份有限公司 | Dipole antenna and omnidirectional probe employing same |
| CN106340713A (en) * | 2016-11-04 | 2017-01-18 | 电子科技大学 | Butterfly directional antenna used for borehole radar |
| CN107104271A (en) * | 2017-04-07 | 2017-08-29 | 广东精点数据科技股份有限公司 | A kind of low frequency loaded antenna |
| CN108332863A (en) * | 2017-01-19 | 2018-07-27 | 天津大学 | A kind of terahertz detector based on monopole antenna realization integrated with NMOS temperature sensors |
| CN109860983A (en) * | 2018-12-11 | 2019-06-07 | 中国地质大学（武汉） | It is a kind of for slurry compounding detection with radar antenna under drilling well |
| CN110994161A (en) * | 2019-12-31 | 2020-04-10 | 电子科技大学 | Asymmetric broadband dipole antenna for borehole radar |
| CN112670714A (en) * | 2020-12-17 | 2021-04-16 | 山东大学 | Four-direction monopole directional antenna system and method for borehole radar detection |
| CN113745824A (en) * | 2021-07-26 | 2021-12-03 | 西安交通大学 | Dipole ground penetrating radar antenna and ground penetrating radar system |
| CN113823902A (en) * | 2021-10-28 | 2021-12-21 | 西安电子科技大学 | VHF/UHF frequency band antenna based on aperture fusion |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0796446B1 (en) * | 1994-12-09 | 2003-02-26 | Schlumberger Technology B.V. | Method and apparatus for logging underground formations using radar |
| CN101908669A (en) * | 2010-06-30 | 2010-12-08 | 苏州市吴通天线有限公司 | Four-branch multi-frequency cylindrical dipole antenna |
-
2011
- 2011-06-17 CN CN 201110163137 patent/CN102354794B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0796446B1 (en) * | 1994-12-09 | 2003-02-26 | Schlumberger Technology B.V. | Method and apparatus for logging underground formations using radar |
| CN101908669A (en) * | 2010-06-30 | 2010-12-08 | 苏州市吴通天线有限公司 | Four-branch multi-frequency cylindrical dipole antenna |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103076637A (en) * | 2013-01-09 | 2013-05-01 | 山东大学 | Delivery transmission device and delivery transmission method for tunnel single-hole geological radar imaging antenna |
| CN104810626A (en) * | 2015-03-02 | 2015-07-29 | 同济大学 | In-hole dual-frequency ground penetrating radar antenna |
| CN104810626B (en) * | 2015-03-02 | 2017-12-15 | 同济大学 | Double frequency ground exploring radar antenna in a kind of hole |
| CN105676007A (en) * | 2016-02-17 | 2016-06-15 | 北京森馥科技股份有限公司 | Dipole antenna and omnidirectional probe employing same |
| CN106340713A (en) * | 2016-11-04 | 2017-01-18 | 电子科技大学 | Butterfly directional antenna used for borehole radar |
| CN106340713B (en) * | 2016-11-04 | 2019-05-14 | 电子科技大学 | A kind of butterfly directional aerial for borehole radar |
| CN108332863A (en) * | 2017-01-19 | 2018-07-27 | 天津大学 | A kind of terahertz detector based on monopole antenna realization integrated with NMOS temperature sensors |
| CN107104271A (en) * | 2017-04-07 | 2017-08-29 | 广东精点数据科技股份有限公司 | A kind of low frequency loaded antenna |
| CN109860983A (en) * | 2018-12-11 | 2019-06-07 | 中国地质大学（武汉） | It is a kind of for slurry compounding detection with radar antenna under drilling well |
| CN110994161A (en) * | 2019-12-31 | 2020-04-10 | 电子科技大学 | Asymmetric broadband dipole antenna for borehole radar |
| CN110994161B (en) * | 2019-12-31 | 2020-11-17 | 电子科技大学 | Asymmetric broadband dipole antenna for borehole radar |
| CN112670714A (en) * | 2020-12-17 | 2021-04-16 | 山东大学 | Four-direction monopole directional antenna system and method for borehole radar detection |
| CN113745824A (en) * | 2021-07-26 | 2021-12-03 | 西安交通大学 | Dipole ground penetrating radar antenna and ground penetrating radar system |
| CN113823902A (en) * | 2021-10-28 | 2021-12-21 | 西安电子科技大学 | VHF/UHF frequency band antenna based on aperture fusion |
| CN113823902B (en) * | 2021-10-28 | 2022-07-12 | 西安电子科技大学 | VHF/UHF frequency band antenna based on aperture fusion |
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| CN102354794B (en) | 2013-11-06 |
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