Abstract
The design and results of investigation of the antenna array for ground penetrating radar are presented. The antenna array is intended for measurement of the electrical properties of the road coating and finding of irregularities at monitoring the quality of roads. Antenna elements are made by PCB technology on the plate of FR4. Each antenna element is placed in a reflector formed by aluminum corner. The results of simulation in CST Studio Suite and the results of measurements of the characteristics of the antenna elements, and their mutual influence are presented. The developed antenna array can be used at the ultrawideband pulse excitation, and at a scanning of continuous frequencies in the range of 0.5–2 GHz.
Highlights
The ground penetrating radar (GPR) technology is promising for the study of the quality of roads and finding of a latent defects in the asphalt coating during the construction and maintenance of roads to prevent damage to the roadway [1]
Monitoring the status of the roadway portion includes determining the thickness and homogeneity of the top coat layer consisting of a asphalt concrete mix, thickness and humidity of the underlying layers of gravel or crushed stone as well as the detection and localization of cavities [2,3,4]
3.1 Design of the antenna element The developed antenna is made on a plate of FR4 with size of 110×110×1 mm
Summary
The ground penetrating radar (GPR) technology is promising for the study of the quality of roads and finding of a latent defects in the asphalt coating during the construction and maintenance of roads to prevent damage to the roadway [1]. Irradiation of the surface layer of asphalt concrete pavement and the underlying layers of pavement by ultrawideband pulses of nanosecond duration provides both the high spatial resolution and the deep penetration of electromagnetic waves due to availability of energy in the low frequency part of the pulse spectrum. Due to the complexity of beam-forming network of the phased antenna array and a high cost of its components it is advantageous to use a switched antenna array. In such matrix the antennas are sequentially connect to the generator or receiver [5], and beamforming algorithm is performed with mathematical processing in a computer. The results of numerical simulation and the measured characteristics are presented
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