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Modeling and Investigation of Planar Parabolic Dipoles for GPR Applications: A Comparison with Bow-Tie Using FDTD
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
2006 (English)In: Journal Electromagnetic Waves and Applications, ISSN 0920-5071, E-ISSN 1569-3937, Vol. 20, no 2, 227-236 p.Article in journal (Refereed) Published
Abstract [en]

This paper presents an analysis of planar parabolic shaped dipoles using the finite difference time domain (FDTD) method. The antenna is resistor-loaded to improve the bandwidth and shielded to suit ground penetrating radar (GPR) applications. The clutter level and the GPR response of the antenna when it is operating above both lossless and lossy mediums are analyzed. The input impedance and the radiation characteristics of the antenna are also described. The results are compared with those of the resistor-loaded bow-tie to assess the antenna's performance.

Place, publisher, year, edition, pages
2006. Vol. 20, no 2, 227-236 p.
Keyword [en]
ground-penetrating radar, perfectly matched layer, antennas, simulation, media
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-6147ISI: 000236106400008Scopus ID: 2-s2.0-33645060745OAI: oai:DiVA.org:kth-6147DiVA: diva2:10775
Note

QC 20100923

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