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dc.contributor.supervisor LoVetri, Joe (Electrical and Computer Engineering) en
dc.contributor.author Su, Hong
dc.date.accessioned 2006-09-19T13:54:15Z
dc.date.available 2006-09-19T13:54:15Z
dc.date.issued 2006-09-19T13:54:15Z
dc.identifier.uri http://hdl.handle.net/1993/286
dc.description.abstract This thesis reports on the investigations of resistive-capacitive (RC) loaded bow-tie antennas with special emphasis on impulse ground penetrating radar applications. Impulse radiation for ground penetrating radar is a challenging research topic because of the unique problem arising from impulse radiation: late-time ringing, which usually masks the important echo signals from the targets. While resistive loading is a common solution for eliminating late-time ringing, use of resistive loading typically sacrifices the radiation efficiency. In this thesis, a resistive-capacitive loading technique is investigated for a circular bow-tie antenna in the attempt to reduce/suppress the late-time ringing as well as to maintain a relatively high radiation efficiency. To implement the system, a microstrip differentiator, which converts a monopulse into a Gaussian-like monocycle to be used as input impulse, is presented. Further, specially designed coplanar waveguide/coplanar strip (CPW/CPS) baluns embedded with Chebyshev transformers of characteristic impedance up to 120 have been constructed and tested. To evaluate the system, instead of using the conventional peak voltage value of the radiated waveform, average radiated energy, average ringing energy, relative radiation efficiency and relative ringing efficiency are utilized and these metrics are easily established using low-cost low-sensitivity probes. Measurement results show that the RC-loading scheme is functioning as expected and the impulse system as a whole is capable of reducing the late-time ringing energy to 50% while maintaining average radiation energy as 83% when compared with capacitive loading cases. en
dc.format.extent 2868172 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US
dc.subject impulse radiation en
dc.subject RC loading en
dc.subject ground penetrating radar en
dc.subject bow-tie en
dc.subject antenna en
dc.title Investigations of rc-loaded bow-tie antennas for impulse ground penetrating radar applications en
dc.type Electronic Thesis or Dissertation en
dc.degree.discipline Electrical and Computer Engineering en
dc.contributor.examiningcommittee Bridges, Greg (Electrical and Computer Engineering) Wang, Gary Gaofeng (Mechnical & Manufacturing Engineering) en
dc.degree.level Master of Science (M.Sc.) en
dc.description.note October 2006 en


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