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A deep parametric study of resistor-loaded bow-tie 55 antennas for ground penetrating radar applications using FDTD
KTH, Superseded Departments, Electrical Systems.
KTH, Superseded Departments, Electrical Systems.ORCID iD: 0000-0001-9241-8030
KTH, Superseded Departments, Electrical Systems.
2004 (English)In: IEEE Transactions on Geoscience and Remote Sensing, ISSN 0196-2892, E-ISSN 1558-0644, Vol. 42, no 4, 732-742 p.Article in journal (Refereed) Published
Abstract [en]

Resistor-loaded bow-tie antennas are analyzed thoroughly to find out their performance on ground-penetrating radar (GPR) applications. The analysis is done with the finite-difference time-domain (FDTD) technique. The antenna is pulse driven and enclosed in a rectangular conducting cavity. The ability to detect a buried conducting sheet using two such identical antennas for transmitting and receiving is investigated. Simulations are carried out for various antenna parameters like end resistor values, flare angle, and antenna length. The gap between the two antennas and their height above the ground are also varied. Moreover, the results are obtained for different sizes, depths, and positions of the buried sheet. It is studied how the broadband impedance characteristics and better target discrimination with low clutter can be achieved by optimally selecting these antenna parameters. Also, it will be shown that apart from the total parallel end resistance, the individual end resistor values and the number of resistors connected have no significant effect on the input impedance and the received signal.

Place, publisher, year, edition, pages
2004. Vol. 42, no 4, 732-742 p.
Keyword [en]
Buried-object detection; Clutter; Impedance matching; Radar antennas
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-6145DOI: 10.1109/TGRS.2003.819442ISI: 000220946000005Scopus ID: 2-s2.0-2442561790OAI: oai:DiVA.org:kth-6145DiVA: diva2:10773
Note
QC 20100818Available 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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Publisher's full textScopushttp://ieeexplore.ieee.org/xpls/abs_all.jsp?isnumber=28723&arnumber=1288368&count=20&index=4

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Norgren, Martin

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