Transient radiation from an unloaded, finite dipole antenna in a borehole: Experimental and numerical results

Sixin Liu; Motoyuki Sato

doi:10.1190/1.2106048

journal article Jan 01, 2005

Transient radiation from an unloaded, finite dipole antenna in a borehole: Experimental and numerical results

Sixin Liu Motoyuki Sato

Geophysics Vol. 70 No. 6 pp. K43-K51 · Society of Exploration Geophysicists

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Abstract

Abstract
Dipole antennas in boreholes are used for tomographic imaging or electromagnetic well logging. A cylindrically layered structure within the borehole will change the radiation characteristics of a dipole antenna. Our objective is to understand the effects of the borehole structure upon the impedance, waveform distortion, and directivity patterns of a dipole antenna. We use a finite-difference, time-domain (FDTD) technique to simulate borehole-antenna radiation, while the geometry of both the dipole and the borehole are modeled with a subgrid technique. The simulated input impedances are verified by experimental results. Both the water-filled and the air-filled boreholes distort the radiated wavefronts, waveforms, and resonant frequencies relative to the same characteristics of a dipole in homogeneous media. A water-filled borehole lowers the first resonant frequency, while an air-filled borehole raises it. At high frequencies, the antenna in the water-filled borehole exhibits radiation side lobes. The borehole effects for water- and air-filled boreholes differ and should not be neglected for borehole antenna design.

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References

26

[1]

Arcone "Numerical studies of the radiation patterns of resistively loaded dipoles" Journal of Applied Geophysics (1995) 10.1016/0926-9851(95)90028-4

[2]

Atlamazoglou "A Galerkin moment method for analysis of an insulated antenna in a dissipative dielectric medium" IEEE Transactions on Microwave Theory and Techniques (1998) 10.1109/22.701454

[3]

Chen "A modeling study of borehole radar for oil-field applications" Geophysics (2002) 10.1190/1.1512793

[4]

Chen "FDTD modeling and analysis of a broadband antenna suitable for oil-field imaging while drilling" IEEE Transactions on Geosciences and Remote Sensing (2002) 10.1109/36.992807

[5]

Chevalier "FDTD local grid with material traverse" IEEE Transactions on Antennas and Propagation (1997) 10.1109/8.558656

[6]

Ebihara "Analysis of a guided wave along a conducting structure in a borehole" Geophysical Prospecting (1998) 10.1046/j.1365-2478.1998.00103.x

[7]

Elliot (1981)

[8]

Ernst (2003)

[9]

Galejs (1969)

[10]

He "A nonuniform cylindrical FDTD algorithm with improved PML and quasi-PML absorbing boundary conditions" IEEE Transactions on Geosciences and Remote Sensing (1999) 10.1109/36.752224

[11]

Holliger "Numerical modeling of borehole georadar data" Geophysics (2002) 10.1190/1.1500387

[12]

King (1981)

[13]

Kunz (1993)

[14]

Lampe "A finite-difference time-domain simulation tool for ground-penetrating radar antennas" Geophysics (2003) 10.1190/1.1581069

[15]

Electromagnetic logging technique based on borehole radar

Sixin Liu, Motoyuki Sato

IEEE Transactions on Geoscience and Remote Sensing 2002 10.1109/tgrs.2002.803847

[16]

Luebbers "A sample feed model that reduces time steps needed for FDTD antenna and microstrip calculations" IEEE Transactions on Antennas and Propagation (1996) 10.1109/8.504308

[17]

Maloney "Accurate computation of the radiation from simple antennas using the finite-difference time-domain method" IEEE Transactions on Antennas and Propagation (1990) 10.1109/8.55618

[18]

Miwa "Subsurface fracture measurement with polarimetric borehole radar" IEEE Transactions on Geosciences and Remote Sensing (1999) 10.1109/36.752199

[19]

Sato (1989)

[20]

Sato "Analysis of a borehole radar in cross-hole mode" IEEE Transactions on Geosciences and Remote Sensing (1991) 10.1109/36.101368

[21]

Sengupta "Analysis investigation of waveforms radiated by a resistively loaded linear antenna excited by a Gaussian pulse" Radio Science (1974) 10.1029/rs009i006p00621

[22]

Smith (1997)

[23]

Stutzman (1998)

[24]

Wang "Finite-difference modeling of borehole ground penetrating radar data" Journal of Applied Geophysics (2002) 10.1016/s0926-9851(01)00092-1

[25]

Wu "The cylindrical antenna with nonreflecting resistive loading" IEEE Transactions on Antennas and Propagation (1965) 10.1109/tap.1965.1138429

[26]

Yee "Numerical solution of initial boundary problems involving Maxwell's equations in isotropic media" IEEE Transactions on Antennas and Propagation (1966) 10.1109/tap.1966.1138693

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Citations

26

References

Details

Published: Jan 01, 2005
Vol/Issue: 70(6)
Pages: K43-K51

Authors

S

Sixin Liu

1Jilin University, Department of Geophysics, 6 Ximinzhu, Changchun 130026, China. E-mail: liusixin@jlu.edu.cn.

M

Motoyuki Sato

2Tohoku University, Center for Northeast Asian Studies, Kawauchi, Sendai 980-8756, Japan. E-mail: sato@cneas.tohoku.ac.jp.

Cite This Article

Sixin Liu, Motoyuki Sato (2005). Transient radiation from an unloaded, finite dipole antenna in a borehole: Experimental and numerical results. Geophysics, 70(6), K43-K51. https://doi.org/10.1190/1.2106048

Transient radiation from an unloaded, finite dipole antenna in a borehole: Experimental and numerical results

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