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Resistive and conductive fabrics sometimes referred to as electro-textiles have wide applications in RFI shielding, anti-static, RFID, wearable antennas, radar absorbing materials for military and automotive applications. Many commercially available conductive and resistive fabrics do not have material specifications at millimeter-wave frequencies such as 77 GHz of interest here. Therefore, the easiest...
It is important to be aware of the geological structures surrounding a coal mine tunnel, especially behind the cutting wall. Electromagnetic (EM) sensors such as ground penetrating radars have been used for this purpose. However, so far, most GPR systems used for this are on the ad-hoc basis and there is a lack of understanding of wave propagation phenomena in active continuous coal mining tunnels...
This paper presents findings of our full-wave simulation study of electromagnetic wave propagation properties in typical underground continuous coal mining tunnel environments. It discusses different wave mechanisms involved as well as several different novel wave-launching concepts such as water-filled dielectric rod antenna, ceiling bolt monopole array, and end-fired array on the arm of cutting...
Multipath error remains the largest error source in many high precision GPS applications. To counteract this problem, solutions at both software and hardware level have been studied. Software processing by means of measurement redundancy or error predictability can be used in order to mitigate the multipath effects. In general, these techniques work properly only when the length of a reflection path...
This paper reviews single-layer and multi-layer dielectric rod antenna design for ultra-wideband (UWB) applications. Different from “polyrod” antennas used for high gain over no more than an octave bandwidth, the UWB rod designs can have many octaves of bandwidth depending on the number of layers. The rod antennas discussed here were design to provide frequency-independent performance such as constant...
This paper discusses about single-layer and multi-layer dielectric rod antenna design. These dielectric rod antennas share several desirable features including ultra-wide bandwidth (UWB), symmetric patterns, dual-polarization, pattern shaping, and phase center control. This paper presents design examples of circular dielectric rod antennas made of one to four dielectric layers. It will be shown that...
A new dielectric rod antenna design modified from its previous version developed by Chen [IEEE Trans. Geosci. Remote Sens. (accepted for publication)] is presented. Such an antenna is useful in detecting small and shallow subsurface objects with excellent depth and spatial resolutions. These features make it useful in detecting small anti-personnel (AP) mines, pavement cracks and the surface layer...
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