Antipodal Vivaldi Antenna with Regular Triangular Shaped Slits for Microwave Imaging of Concrete Materials and Structures
A novel technique for design of antipodal Vivaldi antenna (AVA) in order to lower the low end of frequency band to be applied for imaging of concrete-based specimens is presented in this chapter. To extend the low end of frequency band of the conventional antenna, inner edges of the top and bottom radiators of the antenna have been bent. To enhance gain at lower frequencies, regular triangular slit technique was applied to the antenna. Finally, applicability of the proposed antenna for UWB imaging of construction materials and structures for non-destructive testing and evaluation of concrete-based specimens is demonstrated to highlight the capability of the proposed antenna with the imaging system for the detection of flaws such as void inside construction materials with high-range resolution (e.g. a few millimetres in concrete) and deep penetration depth and propagation path (e.g. more than 200 mm in two ways in concrete).
KeywordsAntipodal Vivaldi antenna UWB High-loss material Detection of flaws Void Penetration depth High-range resolution Plastic pipe Microwave imaging
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