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An Investigation of Some Geometrical Shapes and Selection of Shielding and Lumped Resistors of Planar Dipole Antennas for GPR Applications Using FDTD
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.ORCID iD: 0000-0001-9241-8030
2006 (English)In: IEEE Transactions on Geoscience and Remote Sensing, ISSN 0196-2892, E-ISSN 1558-0644, Vol. 44, no 12, 3555-3562 p.Article in journal (Refereed) Published
Abstract [en]

A ground-penetrating radar (GPR) antenna system is modeled using the three-dimensional finite-difference time-domain technique. This paper investigates some basic geometrical shapes for planar dipoles to find what shape gives the best performance for GPR applications. The antenna is resistor loaded and shielded by a rectangular conducting cavity to suit the application. The effect of adding a wave-absorbing coat to the shield is also studied. Furthermore, a genetic algorithm is used to optimize the cavity height and the resistor values.

Place, publisher, year, edition, pages
2006. Vol. 44, no 12, 3555-3562 p.
Keyword [en]
absorbing media, buried-object detection, dipole antennas, genetic algorithms
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-6148DOI: 10.1109/TGRS.2006.881747ISI: 000242390700009Scopus ID: 2-s2.0-33845666095OAI: oai:DiVA.org:kth-6148DiVA: diva2:10776
Note

QC 20100830 Uppdaterad från accepted till published (20100830)

Available from: 2006-09-21 Created: 2006-09-21 Last updated: 2017-12-14Bibliographically approved
In thesis
1. A comprehensive study of resistor-loaded planar dipole antennas for ground penetrating radar applications
Open this publication in new window or tab >>A comprehensive study of resistor-loaded planar dipole antennas for ground penetrating radar applications
2006 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

Ground penetrating radar (GPR) systems are increasingly being used for the detection and location of buried objects within the upper regions of the earth’s surface. The antenna is the most critical component of such a system. This thesis presents a comprehensive study of resistor-loaded planar dipole antennas for GPR applications using both theory and experiments. The theoretical analysis is performed using the finite difference time domain (FDTD) technique.

The analysis starts with the most popular planar dipole, the bow-tie. A parametric study is done to find out how the flare angle, length, and lumped resistors of the antenna should be selected to achieve broadband properties and good target detection with less clutter. The screening of the antenna and the position of transmitting and receiving antennas with respect to each other and ground surface are also studied. A number of other planar geometrical shapes are considered and compared with the bow-tie in order to find what geometrical shape gives the best performance. The FDTD simulations are carried out for both lossless and lossy, dispersive grounds. Also simulations are carried out including surface roughness and natural clutter like rocks and twigs to make the modeling more realistic.

Finally, a pair of resistor-loaded bow-tie antennas is constructed and both indoor and outdoor measurements are carried out to validate the simulation results.

Place, publisher, year, edition, pages
Stockholm: KTH, 2006. xii, 54 p.
Series
Trita-EE, ISSN 1653-5146 ; 2006:033
Keyword
Ground penetrating radar, buried object detection, dipole antennas, FDTD methods, broadband properties, baluns, simulation, optimal design, lossy media, dispersive media, clutter.
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-4110 (URN)91-7178-426-8 (ISBN)
Public defence
2006-10-06, F3, Lindstedtsvägen 26, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20100923

Available from: 2006-09-21 Created: 2006-09-21 Last updated: 2012-10-02Bibliographically approved

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Norgren, Martin

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