Time-domain imaging of airborne targets using ultra-wideband or short-pulse radar

1995 ◽  
Vol 43 (3) ◽  
pp. 327-329 ◽  
Author(s):  
E.J. Rothwell ◽  
K.M. Chen ◽  
D.P. Nyquist ◽  
J.E. Ross
Keyword(s):  
Time Domain ◽  
Short Pulse ◽  
Ultra Wideband ◽  
Pulse Radar

scholarly journals Design of Output-Input Inversed Polarity Pulse Power Divider for Ultra-Wideband Communications

2018 ◽  
Vol 2018 ◽  
pp. 1-6
Author(s):  
Yufu Li ◽  
XiaoXing Yin
Keyword(s):  
Time Domain ◽  
Short Pulse ◽  
Input Pulse ◽  
Output Pulse ◽  
Pulse Power ◽  
Ultra Wideband ◽  
Power Divider ◽  
Power Dividers ◽  
Coplanar Stripline ◽  
Inverse Fourier Transformation

The implementation of a output-input inverse polarity pulse power divider based on the use of a SMA directly feed asymmetric coplanar stripline phase inverter for ultra-wideband communication is proposed. The novelty of the proposed power divider can be demonstrated that the electromagnetic energy guided by the CPW divides naturally into the slots of two asymmetric coplanar striplines and the polarity of the input pulse be reversed by asymmetric coplanar stripline to SMA transition. SMA connectors are mounted directly to the output asymmetric coplanar striplines and seven pairs of metal rods are soldered vertically to the substrate with seven resistors on top for improving the isolation and matching performance. The simulated and measured result in frequency domain agree well showing equal power division with less than 2 dB of additional insertion loss and in-phase for the outputs ports across the desired band of 0.4 GHz to 4.0 GHz (one decade) which indicates an ultra-wideband feature. The return loss for all the ports and the isolation between the two output ports are better than 10 dB which demonstrates good matching and isolation performance. To illustrate the short pulse performance of the proposed power divider, Inverse Fourier Transformation is used to calculate the input and output signals. The Gaussian pulse with a −10 dB bandwidth is utilized as the stimulus signal and the port signals in time domain are derived from the measured scattering parameters and discussed. Time domain results show that the same magnitude of the pulse is obtained between the two outputs and the polarity of the output pulse has been inversed compared to the input one. Simulated and measured results in both frequency and time domain agree well and show the feasibility and validity of the proposed power dividers.

Detection of Avalanche Victims Using Ultra-wideband Short-Pulse Radar

2007 ◽  
pp. 632-645 ◽  
Author(s):  
Walid A. Chamma ◽  
Howard Mende ◽  
Greg Barrie ◽  
Robert Robinson
Keyword(s):  
Short Pulse ◽  
Ultra Wideband ◽  
Pulse Radar

A New Ultra Wideband, Short Pulse, Radar System for Mine Detection

2002 ◽  
pp. 175-182 ◽  
Author(s):  
F. Gallais ◽  
V. Mallepeyre ◽  
Y. Imbs ◽  
B. Beillard ◽  
J. Andrieu ◽  
...  
Keyword(s):  
Short Pulse ◽  
Radar System ◽  
Ultra Wideband ◽  
Mine Detection ◽  
Pulse Radar

AN ULTRA-WIDEBAND ANTENNA WITH BAND REJECT CAPABILITY AND ITS CHARACTERIZATION IN TIME DOMAIN

2011 ◽  
Vol 19 ◽  
pp. 223-234 ◽  
Author(s):  
Rishik Bazaz ◽  
Shiban Kishen Koul ◽  
Mithilesh Kumar ◽  
Ananjan Basu
Keyword(s):  
Time Domain ◽  
Ultra Wideband ◽  
Wideband Antenna

Electrodynamics of ultra-wideband short-pulse processes in irregular transmission lines

2002 ◽  
Vol 47 (7) ◽  
pp. 504-506
Author(s):  
M. N. Golikov ◽  
V. I. Koroza ◽  
V. N. Mikhailov
Keyword(s):  
Transmission Lines ◽  
Short Pulse ◽  
Ultra Wideband
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