A Modified Bow-Tie Antenna for Improved Pulse Radiation

被引：73

作者：

Lestari, Andrian Andaya ^{[1
,2
]}

Bharata, Endon ^{[1
]}

Suksmono, Andriyan Bayu ^{[1
]}

Kurniawan, Adit ^{[1
]}

Yarovoy, Alexander G. ^{[2
]}

Ligthart, Leo P. ^{[2
]}

机构：

[1] Bandung Inst Technol, IRCTR, Bandung 40132, Indonesia

[2] Delft Univ Technol, IRCTR, NL-2628 CD Delft, Netherlands

来源：

IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION | 2010年 / 58卷 / 07期

关键词：

Bow-tie antenna; ground penetrating radar (GPR); resistive loading; ultrawideband (UWB) antenna; CHARACTERISTIC IMPEDANCE;

D O I：

10.1109/TAP.2010.2048853

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

The analysis, design, and realization of a modified bow-tie antenna optimized for impulse ground penetrating radar (GPR) applications is described. The proposed antenna shows improved properties important for GPR, which include its compact size (in comparison with a conventional bow-tie antenna) and ability to radiate UWB pulses with increased amplitude and very small late-time ringing. A substantial increase in the amplitude of the transmitted pulse is achieved by utilizing radiation from discontinuities introduced by the resistive loading employed in the antenna to suppress late-time ringing. By choosing an optimal distance between the antenna's feed point and the location of the resistive loading, radiations that occur from the antenna's feed point and the mentioned discontinuities at the resistive loading will combine constructively in the boreside direction of the antenna. As a result, one will observe a substantial increase of the amplitude of the transmitted pulse in the boreside direction. Furthermore, an analytical expression describing approximate time-harmonic current distribution is derived to indicate an optimal resistive loading profile for the proposed antenna. Additionally, the traveling-wave current distribution of the antenna is theoretically analyzed to examine the applicability of the obtained time-harmonic expression for pulse excitation. It has been found that when the antenna is resistively loaded both the time-harmonic and traveling-wave currents decay to approach nearly the same value at the end section of the antenna. As the amount of current at the antenna ends corresponds to the level of reflection which occurs there, the derived expression is found to be useful to indicate an optimal loading profile for the proposed antenna. A theoretical model of the proposed antenna has been developed to perform numerical analysis using a modified NEC-2 code. In addition, an experimental verification has been carried out and both the simulation and experiment confirmed the improved properties of the proposed antenna.

引用

页码：2184 / 2192

页数：9

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