The self-grounded Bow-Tie antenna

Characterization of antennas in far-field applications, both in Line-Of-Sight (LOS) applications (such as in radar systems, point-to-point communications, satellite communications, radio telescopes, etc.) and multipath environment applications (such as mobile communications, indoor communications and indoor geolocations, etc.), is well defined and can be evaluated by well-developed measurement techniques. However, it is still not established how to characterize antennas in nearfield sensing applications, where most of the characteristics of antenna in far-field applications are not valid anymore. In this paper, we investigate the characteristics of antennas in nearfield sensing applications. The penetration ability, both in timedomain and in frequency-domain is introduced and evaluated. Three UWB antennas, with both simulated and measured results are presented here to demonstrate and evaluate the penetration ability, and the difference from the far-field characteristics, such as the directivity. It is concluded that the higher directivity in far-field does not guarantee a deeper penetration in near-field.Index Terms-ultra-wideband antenna system, shape reconstruction.

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A multilayer-stacked UWB Yagi antenna

Wan

Xie

Zheng

et al. 2017

2017 International Symposium on Antennas and Propagation (ISAP)

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By taking advantage of a wideband bow-tie antenna in the Yagi configuration, a novel multilayer-stacked ultra-wideband (UWB) Yagi antenna is proposed. First, the fundamental 3-layered UWB Yagi model is studied with respect to a few critical dimensions. Then, several directors are added to form a multilayer-stacked Yagi antenna, where the width of the directors is optimized in a monotonic decreasing manner. A sixlayered UWB Yagi antenna is studied by simulations. It covers 3.4-10.6 GHz with its return loss better than 10 dB, and it achieves a high directivity up to 13 dBi and a relative cross-polar level better than -10 dB in the whole band.

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The self-grounded Bow-Tie antenna

Cited by 4 publications

References 10 publications

Microwave imaging of near-field object using ultra-wideband synthetic aperture radar algorithm

Microwave imaging of near-field object using ultra-wideband synthetic aperture radar algorithm

Investigation of penetration ability of UWB antennas in near-field sensing applications

A multilayer-stacked UWB Yagi antenna

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