Title :
Resistively loaded insulated antennas for narrow borehole radar
Author :
Claassen, Daniel M. ; Bansal, Rajeev ; Mason, Iain M. ; Hargreaves, Jonathan E.
Author_Institution :
Dept. of Eng. Sci., Oxford Univ., UK
Abstract :
The transmission-line model for an insulated symmetric dipole in a lossy medium has been extended for the case of an insulated asymmetric dipole with a conductive arm and a uniformly resistive arm. The model is used to improve the understanding of the characteristics of a narrow borehole impulse radar recently developed. It predicts that sufficient loading of the resistive arm will dampen the antenna suitably for pulse transmission, despite the presence of the conductive arm. The model is partly verified by laboratory experiments. Examples of pulses received in situ in marble by the radar are presented
Keywords :
dielectric-loaded antennas; geophysical equipment; geophysical techniques; radar antennas; radar applications; terrestrial electricity; borehole method; conductive arm; damping; geoelectric; geology; geophysical measurement technique; ground penetrating radar; impulse radar; insulated asymmetric dipole; insulated symmetric dipole; lossy medium; marble; narrow borehole radar; pulse transmission; radar antenna; resistively loaded insulated antenna; terrestrial electricity; transmission-line model; uniformly resistive arm; well logging; Broadband antennas; Equations; Impedance; Insulation; Loaded antennas; Propagation losses; Radar antennas; Radar imaging; Transmission lines; Transmitting antennas;
Conference_Titel :
Geoscience and Remote Sensing Symposium, 1995. IGARSS '95. 'Quantitative Remote Sensing for Science and Applications', International
Conference_Location :
Firenze
Print_ISBN :
0-7803-2567-2
DOI :
10.1109/IGARSS.1995.524004
