A high gain, wide bandwidth isolated amplifier for using in fracture process transient analysis

2002 ◽  
Author(s):  
M.A. Perez ◽  
V. Romero ◽  
J.C. Anton ◽  
J.C. Campo
Keyword(s):  
Transient Analysis ◽  
Fracture Process ◽  
High Gain ◽  
Wide Bandwidth

scholarly journals ULTRA WIDE BANDWIDTH HIGH GAIN VIVALDI ANTENNA FOR WIRELESS COMMUNICATIONS

2017 ◽  
Vol 69 ◽  
pp. 105-111 ◽  
Author(s):  
Dalia Mohammed Nasha Elsheakh ◽  
Nermeen A. Eltresy ◽  
Esmat Abdallah Abdel Fattah
Keyword(s):  
Wireless Communications ◽  
High Gain ◽  
Wide Bandwidth ◽  
Vivaldi Antenna

scholarly journals Alternating Strain Regimes for Failure Propagation in Flexural Systems

2019 ◽  
Vol 72 (3) ◽  
pp. 305-339 ◽  
Author(s):  
M Garau ◽  
M J Nieves ◽  
I S Jones
Keyword(s):  
Steady State ◽  
Transient Analysis ◽  
Fracture Process ◽  
Mechanical Load ◽  
Dynamic Features ◽  
Hopf Equation ◽  
Beam Structure ◽  
Numerical Studies ◽  
Failure Propagation ◽  
Discrete Mass

Summary We consider both analytical and numerical studies of a steady-state fracture process inside a discrete mass-beam structure, composed of periodically placed masses connected by Euler–Bernoulli beams. A fault inside the structure is assumed to propagate with a constant speed and this occurs as a result of the action of a remote sinusoidal, mechanical load. The established regime of fracture corresponds to the case of an alternating generalised strain regime. The model is reduced to a Wiener–Hopf equation and its solution is presented. We determine the minimum feeding wave energy required for the steady-state fracture process to occur. In addition, we identify the dynamic features of the structure during the steady-state fracture regime. A transient analysis of this problem is also presented, where the existence of steady-state fracture regimes, revealed by the analytical model, are verified and the associated transient features of this process are discussed.

scholarly journals Design of Wideband Slot Antenna Array with Stereoscopic Differentially Fed Structures

2019 ◽  
Vol 2019 ◽  
pp. 1-14 ◽  
Author(s):  
Guang Sun ◽  
Ge Gao ◽  
Tingting Liu ◽  
Yi Liu ◽  
Hu Yang
Keyword(s):  
Antenna Array ◽  
High Gain ◽  
Radar System ◽  
Slot Antenna ◽  
Impedance Bandwidth ◽  
Antenna Element ◽  
Radiation Characteristics ◽  
Wide Bandwidth ◽  
Feeding Structure

In this paper, a wideband slot antenna element and its array with stereoscopic differentially fed structures are proposed for the radar system. Firstly, a series of slots and a stereoscopic differentially fed structure are designed for the antenna element, which makes it possess a wide bandwidth, stable radiation characteristics, and rather high gain. Moreover, the stereoscopic feeding structure can firmly support the antenna’s radiation structure and reduce the influence of feeding connectors on radiating performance. Secondly, a 4 × 4 array is designed using the proposed antenna element. And a hierarchical feeding network is designed for the array on the basis of the stereoscopic differentially fed structure. For validation, the antenna element and 4 × 4 array are both fabricated and measured: (1) the measured −10 dB impedance bandwidth of the antenna element is 62% (6.8–12.9 GHz) and the gain within the entire band is 5–9.7 dBi and (2) the measured −10 dB impedance bandwidth of the array is approximately 50% (7 to 12 GHz) with its gain being 14–19.75 dBi within the entire band. Notably, measured results agree well with simulations and show great advantages over other similar antennas on bandwidth and gain.

scholarly journals A Novel Metamaterial-Based Planar Integrated Luneburg Lens Antenna With Wide Bandwidth and High Gain

IEEE Access ◽  
2020 ◽  
Vol 8 ◽  
pp. 4708-4713 ◽  
Author(s):  
Bo Hu ◽  
Tao Wu ◽  
Yang Cai ◽  
Wei Zhang ◽  
Bao-Ling Zhang
Keyword(s):  
High Gain ◽  
Wide Bandwidth ◽  
Lens Antenna ◽  
Luneburg Lens
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