Jung, Ji-Hyun Cho, Jae-Hyoung Kim, Se-Yun 2024-01-20T00:04:36Z 2024-01-20T00:04:36Z 2021-09-03 2017-11 0018-926X https://pubs.kist.re.kr/handle/201004/122134 Two equivalent models to sleeve dipole antennas fed by ferrite-loaded coaxial cables for a scaled-down cross-borehole radar are tested by employing the finite-difference time-domain method. Compared to the measured diffraction patterns of an air-filled circular cylinder in water, the simulated results based on the simplified perfect magnetic conductor model cannot provide sufficient attenuation not only in the single dip pattern at 2.6 GHz but also in double dip pattern at 2.8 GHz. It leads us to develop a more accurate one so-called distributed element model which is implemented by a finite sum of serial sections consisting of a resistor, a finite length of perfect electric conductor (PEC) cylinder, an inductor, and the same PEC cylinder. When the values of the distributed elements as well as the number of serial sections are adjusted properly, the simulated diffraction patterns closely approach to the experimentally measured data at both frequencies of 2.6 and 2.8 GHz. English IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC MAGNETIZED FERRITES FDTD ANALYSIS PROPAGATION PATTERN MEDIA MODEL WAVE Analysis of Sleeve Dipole Antennas Fed by Ferrite-Loaded Coaxial Cables for a Scaled-Down Cross-Borehole Radar Article 10.1109/TAP.2017.2754469 1 IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, v.65, no.11, pp.6130 - 6133 IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION 65 11 6130 6133 scie scopus 000414047400049 2-s2.0-85030764861 Engineering, Electrical & Electronic Telecommunications Engineering Telecommunications Article MAGNETIZED FERRITES FDTD ANALYSIS PROPAGATION PATTERN MEDIA MODEL WAVE Cross-borehole radar diffraction pattern ferrite-loaded coaxial cable sleeve dipole antenna