Picosecond ultra-wideband short pulse radiated by antenna arrays

2007 ◽  
Vol 49 (5) ◽  
pp. 1148-1151
Author(s):  
Chi Ruan ◽  
Wei Zhao ◽  
Guo-Fu Chen ◽  
Shao-Lan Zhu ◽  
Bai-Yu Liu ◽  
...  
Keyword(s):  
Antenna Arrays ◽  
Short Pulse ◽  
Ultra Wideband

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

Design and Analysis of Integrated Wilkinson Power Divider-Fed Conformal High-Gain UWB Array Antenna with Band Rejection Characteristics for WLAN Applications

2020 ◽  
pp. 2150133
Author(s):  
Soufian Lakrit ◽  
Hicham Medkour ◽  
Sudipta Das ◽  
B. T. P. Madhav ◽  
Wael A. E. Ali ◽  
...  
Keyword(s):  
Antenna Arrays ◽  
Local Area Network ◽  
Ultra Wideband ◽  
Bending Test ◽  
Power Divider ◽  
Area Network ◽  
Curved Surfaces ◽  
Uwb Antenna ◽  
High Isolation ◽  
Wilkinson Power Divider

Flexible ultra-wideband (UWB) antenna arrays with band notching characteristics are proposed in this work. A new wideband and high-isolation Wilkinson power divider (WPD) is designed to construct the feed systems of the UWB antenna arrays. The proposed WPD is achieved by introducing a significant modification to the conventional WPD and the new one is composed of four isolation stages. Multiple stages helped to achieve wideband from 2[Formula: see text]GHz to more than 12[Formula: see text]GHz with high isolation characteristics of more than 20[Formula: see text]dB and insertion losses around 3.3[Formula: see text]dB. The designed WPD is then applied to feed two UWB monopole antenna arrays which offer a notched band centered at 5.5[Formula: see text]GHz to reject interference from wireless local area network (WLAN) system and can be integrated with curved surfaces. To verify the performance of the proposed structure, two array configurations are practically fabricated and measured. The results show that both the arrays have UWB operational bandwidth (3.5–11.8[Formula: see text]GHz for [Formula: see text] array and 3.6–12[Formula: see text]GHz for [Formula: see text] array) that includes the UWB spectrum. Attractive agreement between simulation and measurement results is obtained. Furthermore, the bending test is carried out on the [Formula: see text] array showing the good performance of the proposed system when installed on curved surfaces for different bent angles.

Changes in the human nuclear chromatin induced by ultra wideband pulse irradiation

2009 ◽  
Vol 4 (1) ◽  
pp. 97-106 ◽  
Author(s):  
Yuriy Shckorbatov ◽  
Vladimir Pasiuga ◽  
Nicolai Kolchigin ◽  
Dmitry Batrakov ◽  
Oleg Kazansky ◽  
...  
Keyword(s):  
Irradiation Dose ◽  
Short Pulse ◽  
Ultra Wideband ◽  
Nuclear Chromatin ◽  
Pulse Radiation ◽  
Cell Nuclei ◽  
Irradiation Effects ◽  
Granule Formation ◽  
Irradiation Intensity ◽  
Ultra Short Pulse

AbstractThe effects of ultra wideband pulse radiation on human cells were investigated. The density of the flow of energy on the surface of irradiated object varied from 10−6 to 10−2 W/cm2 with exposure of 10 s. It was shown that heterochromatin granule quantity in cell nuclei increased under the influence of radiation from 10−4 to 10−2 W/cm2. In some intervals the effect increased with irradiation dose. At irradiation intensity 10−3 W/cm2 the process of heterochromatin granule formation was fully reversible after 2 h of recovery; at intensity 10−2 W/cm2 the reversion of irradiation effects was not full. The data obtained indicated the strong biological activity of ultra wideband ultra short pulse radiation.

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