RC-loaded bow-tie antenna for improved pulse radiation

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...

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Bibliographic Details
Published in:IEEE transactions on antennas and propagation 2004-10, Vol.52 (10), p.2555-2563
Main Authors: Lestari, A.A., Yarovoy, A.G., Ligthart, L.P.
Format: Article
Language:English
Subjects:
Antenna feeds
Antennas
Applied sciences
Bandwidth
Buried object detection
Construction
Exact sciences and technology
Excitation
Ground penetrating radar
Loaded antennas
Microwave absorbers
Microwave antennas
Noise levels
Position (location)
Radiocommunications
Reactance
Reflector antennas
Slot antennas
Telecommunications
Telecommunications and information theory
Transmitting antennas
Ultra wideband antennas
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Summary: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.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2004.834444