Effective Radiation Efficiency of Resistor-Loaded Bow-Tie Antenna Covered with Ferrite-Coated Conducting Cavity Located above Ground Surface

Yasuhiro NISHIOKA  Toru UNO  

IEICE TRANSACTIONS on Communications   Vol.E83-B   No.2   pp.419-421
Publication Date: 2000/02/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Antennas and Propagation
ground-penetrating radar,  radiation efficiency,  resistor-loaded antenna,  ferrite absorber,  FDTD,  

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This paper analyzes the effective radiation efficiency of a ground-penetrating radar (GPR) consisting of two resistor-loaded bow-tie antennas covered with a ferrite-coated conducting cavity by using finite-difference time-domain (FDTD) method. The GPR is located above a lossless or lossy ground surface. The relation between the radiation powers into the ground and air, dissipated powers at the loaded resistors and ferrite absorber, and the reflected power due to impedance mismatching, is clarified numerically.