DocumentCode :
1129655
Title :
RC-loaded bow-tie antenna for improved pulse radiation
Author :
Lestari, Andrian Andaya ; Yarovoy, Alexander G. ; Ligthart, Leo P.
Author_Institution :
Int. Res. Centre for Telecommun.-transmission & Radar, Delft Univ. of Technol., Netherlands
Volume :
52
Issue :
10
fYear :
2004
Firstpage :
2555
Lastpage :
2563
Abstract :
In this paper, a loading technique for improving pulse radiation from bow-tie antennas is introduced. This technique allows transmission of short transient pulses with very small late-time ringing and relatively high radiation efficiency. It makes use of a combination of a constant resistive loading along the antenna and a capacitive loading with linearly increasing reactance toward the antenna ends. The constant resistive loading is applied using volumetric microwave absorbers to cover one side of the antenna and the linear capacitive loading is realized by constructing narrow slots on the antenna surface. Relatively high radiation efficiency is achieved by choosing the location of the slot nearest to the feed point in such a way that radiation from it combines constructively with radiation from the feed point. Using a 0.8-ns monocycle for excitation, the technique results in a level of late-time ringing of lower than -40 dB and at the same time the peak value of the transmitted pulse is 54% higher than that of the same antenna without loading.
Keywords :
antenna radiation patterns; broadband antennas; electromagnetic wave absorption; ground penetrating radar; microstrip antennas; radar antennas; bow-tie antenna; constant resistive loading; late-time ringing; linear capacitive loading; loading technique; pulse radiation; ultrawideband antenna; volumetric microwave absorber; Antenna feeds; Bandwidth; Buried object detection; Ground penetrating radar; Loaded antennas; Microwave antennas; Reflector antennas; Slot antennas; Transmitting antennas; Ultra wideband antennas; Bow-tie antennas; capacitive loading; resistive loading; ultrawide-band antennas;
fLanguage :
English
Journal_Title :
Antennas and Propagation, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-926X
Type :
jour
DOI :
10.1109/TAP.2004.834444
Filename :
1341609
Link To Document :
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