《A Modied Bow-Tie Antenna for Improved Pulse》.pdf

2184 IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, VOL. 58, NO. 7, JULY 2010 A Modified Bow-Tie Antenna for Improved Pulse Radiation Andrian Andaya Lestari, Member, IEEE, Endon Bharata, Andriyan Bayu Suksmono, Senior Member, IEEE, Adit Kurniawan, Alexander G. Yarovoy, Senior Member, IEEE, and Leo P. Ligthart, Fellow, IEEE Abstract— The analysis, design, and realization of a modified already reported in the past by many investigators including bow-tie antenna optimized for impulse ground penetrating radar Brown and Woodward who carried out an experimental inves- (GPR) applications is described. The proposed antenna shows tigation of bow-tie antennas [1], Carrel who was the first to improved properties important for GPR, which include its compact size (in comparison with a conventional bow-tie antenna) and show analytically that the bandwidth of a bow-tie antenna de- ability to radiate UWB pulses with increased amplitude and very pends on the bow-tie flare angle [2], Lambert et al. [3] and Lee small late-time ringing. A substantial increase in the amplitude and Smith [4] who improved Carrel’s analytical solution, and of the transmitted pulse is achieved by utilizing radiation from Shlager et al. [5] and Leat et al. [6] who developed a numer- discontinuities introduced by the resistive loading employed in the antenna to suppress late-time ringing. By choosing an optimal ical model for a bow-tie antenna. In the last couple of decades distance between the antenna’s feed point and the location of the bow-tie antennas have been introduced in many ultrawideband resistive loading, radiations that occur from the ante