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Article: FDTD modeling and analysis of a broadband antenna suitable for oil-field imaging while drilling

TitleFDTD modeling and analysis of a broadband antenna suitable for oil-field imaging while drilling
Authors
KeywordsBorehole Radar
Broadband Antenna
Finite Difference
Imaging While Drilling
Input Impedance
Subsurface
Issue Date2002
Citation
Ieee Transactions On Geoscience And Remote Sensing, 2002, v. 40 n. 2, p. 434-442 How to Cite?
AbstractThis paper develops a finite-difference time-domain (FDTD) approach suitable for modeling general antenna structures which include cylindrical dipoles. The medium averaging is a key factor of the method since the FDTD grid size is comparable to the dimensions of the antenna. It is essential in the FDTD calculation to account for the effective media seen by different electric field components. The input impedance calculated by the FDTD approach agrees well with the published results for a cylindrical dipole, although only one cell in the transverse direction is assigned as the metallic conductor. This FDTD approach is then used to model and analyze a novel broadband antenna which can be used in a borehole radar system for oil-field imaging while drilling. The antenna is essentially a horizontal cut on a metallic drill collar with a vertical cylindrical dipole placed across the cut and loaded at the ends. Based on the modeling results, we found that a proper resistive loading is the key in order to increase the bandwidth of the antenna and reduce ringing. When properly loaded, the antenna has a fairly flat input impedance ranging from 50 MHz to 600 MHz. The real part of the input impedance varies favorably around 75 Ω. In addition, the input impedance of the antenna is not very sensitive to the surrounding medium. The simulated antenna radiation of the electric field shows good azimuthal discrimination. For a lossless medium with a permittivity of 20ε 0 the front-back ratio climbs from around 15 dB at 100 MHz to about 45 dB at 600 MHz.
Persistent Identifierhttp://hdl.handle.net/10722/182667
ISSN
2015 Impact Factor: 3.36
2015 SCImago Journal Rankings: 1.975
References

 

DC FieldValueLanguage
dc.contributor.authorChen, YHen_US
dc.contributor.authorCoates, RTen_US
dc.contributor.authorChew, WCen_US
dc.date.accessioned2013-05-02T05:16:21Z-
dc.date.available2013-05-02T05:16:21Z-
dc.date.issued2002en_US
dc.identifier.citationIeee Transactions On Geoscience And Remote Sensing, 2002, v. 40 n. 2, p. 434-442en_US
dc.identifier.issn0196-2892en_US
dc.identifier.urihttp://hdl.handle.net/10722/182667-
dc.description.abstractThis paper develops a finite-difference time-domain (FDTD) approach suitable for modeling general antenna structures which include cylindrical dipoles. The medium averaging is a key factor of the method since the FDTD grid size is comparable to the dimensions of the antenna. It is essential in the FDTD calculation to account for the effective media seen by different electric field components. The input impedance calculated by the FDTD approach agrees well with the published results for a cylindrical dipole, although only one cell in the transverse direction is assigned as the metallic conductor. This FDTD approach is then used to model and analyze a novel broadband antenna which can be used in a borehole radar system for oil-field imaging while drilling. The antenna is essentially a horizontal cut on a metallic drill collar with a vertical cylindrical dipole placed across the cut and loaded at the ends. Based on the modeling results, we found that a proper resistive loading is the key in order to increase the bandwidth of the antenna and reduce ringing. When properly loaded, the antenna has a fairly flat input impedance ranging from 50 MHz to 600 MHz. The real part of the input impedance varies favorably around 75 Ω. In addition, the input impedance of the antenna is not very sensitive to the surrounding medium. The simulated antenna radiation of the electric field shows good azimuthal discrimination. For a lossless medium with a permittivity of 20ε 0 the front-back ratio climbs from around 15 dB at 100 MHz to about 45 dB at 600 MHz.en_US
dc.languageengen_US
dc.relation.ispartofIEEE Transactions on Geoscience and Remote Sensingen_US
dc.subjectBorehole Radaren_US
dc.subjectBroadband Antennaen_US
dc.subjectFinite Differenceen_US
dc.subjectImaging While Drillingen_US
dc.subjectInput Impedanceen_US
dc.subjectSubsurfaceen_US
dc.titleFDTD modeling and analysis of a broadband antenna suitable for oil-field imaging while drillingen_US
dc.typeArticleen_US
dc.identifier.emailChew, WC: wcchew@hku.hken_US
dc.identifier.authorityChew, WC=rp00656en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1109/36.992807en_US
dc.identifier.scopuseid_2-s2.0-0036476994en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0036476994&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume40en_US
dc.identifier.issue2en_US
dc.identifier.spage434en_US
dc.identifier.epage442en_US
dc.publisher.placeUnited Statesen_US
dc.identifier.scopusauthoridChen, YH=7601426431en_US
dc.identifier.scopusauthoridCoates, RT=7102825152en_US
dc.identifier.scopusauthoridChew, WC=36014436300en_US

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