scholarly journals An Improved Modified Universal Ultra-Wideband Antenna Designed for Step Frequency Continuous Wave Ground Penetrating Radar System

Sensors ◽  
2019 ◽  
Vol 19 (5) ◽  
pp. 1045 ◽  
Author(s):  
Yuxuan Wu ◽  
Feng Shen ◽  
Yue Yuan ◽  
Dingjie Xu
Keyword(s):  
Ground Penetrating Radar ◽  
Continuous Wave ◽  
Soil Surface ◽  
Antenna System ◽  
Ultra Wideband ◽  
Step Frequency ◽  
Uwb Antenna ◽  
Ground Penetrating ◽  
Better Than ◽  
Bow Tie

Step Frequency Continuous Wave Ground Penetrating Radar (SFCW-GPR), as a tool for nondestructive testing of shallow soil surface targets, the realization of the function of SFCW-GPR is mainly based on the theory of refraction, reflection and scattering of electromagnetic wave in the discontinuity of dielectric constant. So, the UWB antenna system, an important part of SFCW-GPR, becomes more indispensable. In this paper, an improved modified universal antenna is designed, simulated and fabricated. Based on a typical Bow-tie antenna, it is modified by the methods of lumped loads, cavity-backed loading and structure loading. The simulated and measured results show that the UWB antenna has 1.36 GHz bandwidth from 0.64 to 2.0 GHz with three resonant wavelength peaks, and having been modified and improved, the UWB antenna performances including voltage standing-wave ratio (VSWR), input impedance, the boresight gain and current distribution, are much better than the typical Bow-tie antenna. In addition, the results of verification experiment of Step Frequency Continuous Wave (SFCW) show that the antenna can be applied to the working scenarios of SFCW-GPR.

scholarly journals Step-Frequency Ground Penetrating Radar for Agricultural Soil Morphology Characterisation

2019 ◽  
Vol 11 (9) ◽  
pp. 1075
Author(s):  
Federico Lombardi ◽  
Maurizio Lualdi
Keyword(s):  
Ground Penetrating Radar ◽  
Precision Agriculture ◽  
Continuous Wave ◽  
Textural Properties ◽  
Electromagnetic Properties ◽  
Soil Morphology ◽  
Agricultural Field ◽  
Step Frequency ◽  
Imaging Results ◽  
Ground Penetrating

Soil morphology plays a fundamental role in the vertical and lateral movements of solutes and water transport, providing knowledge regarding spatial distribution of its textural properties and subsurface dynamics. In this framework, the measured values of electrical conductivity are able to reveal the heterogeneity of soil that is present in a particular agricultural field and they are affected by more than one important physical characteristic: soil texture, organic matter, moisture content, and the depth of the clay pan. In the microwave region, these dynamics are known to exhibit a frequency dependent behaviour. This study explores the application of a Step Frequency Continuous Wave Ground Penetrating Radar (SFCW GPR) to shed light on the practical impact that these dependencies have on the imaging results, not only regarding the electrical characterisation of the subsurface morphology, but also in its correct interpretation. This information is of notable importance for determining water-use efficiency and planning precision-agriculture programs. The results clearly show visible and significant fluctuations of the amplitude levels, depending on the considered central frequency, demonstrating that the frequency dependence of electromagnetic properties of heterogeneous soil are significant and cannot be ignored if the aim is to properly define the subsurface attributes. The measurements also suggest that correlating the delineated variations might help in the identification of extended features and the classification of areas that possess similar properties in order to increase the confidence in monitoring soil resources.

Ultra-Wideband Bow-tie Antenna for Ground Penetrating Radar Applications

2019 ◽  
Vol 51 (02) ◽  
pp. 231-236
Author(s):  
A. A. JAMALI ◽  
B. DAS ◽  
S. AFRIDI ◽  
M. R. ANJUM ◽  
K. KANWAR ◽  
...  
Keyword(s):  
Ground Penetrating Radar ◽  
Ultra Wideband ◽  
Radar Applications ◽  
Ground Penetrating ◽  
Bow Tie

scholarly journals Multiobjective-Optimized Design of a New UWB Antenna for UWB Applications

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
C. Moreno de Jong van Coevorden ◽  
M. Fernández Pantoja ◽  
Salvador G. García ◽  
A. Rubio Bretones ◽  
R. Gómez-Martín ◽  
...  
Keyword(s):  
Ground Penetrating Radar ◽  
Low Cost ◽  
Optimized Design ◽  
Uwb Antenna ◽  
Multiobjective Genetic Algorithm ◽  
High Data ◽  
Resistive Loading ◽  
Uwb Applications ◽  
Ground Penetrating ◽  
Bow Tie

A multiobjective genetic algorithm has been applied to design a new printed, bow-tie antenna for ultrawideband applications, that is, ground penetrating radar, short range and high data rate communications, and so forth. The ultrawideband performance with respect to antenna impedance and gain is achieved by an optimized resistive loading profile and flare angle. A low-cost prototype is manufactured and numerical simulations are validated with measurements.

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