Object dimension Vs antenna frequency

The study deals with the performance of antenna frequency in detecting objects as a function of their dimensions. The results refer to actual data acquired with an IDS instrument, equipped with antenna frequency of 200, 600 and 2000 MHz, on an ancient wall reinforced with micro-piles, and on a concrete beam reinforced with iron bars. The micro-piles and iron bars are 0.13 m and 0.02 m in diameter respectively. The study shows that the dimensions of the objects in relation to the wavelength and the heterogeneity of the host environment, play an important role in making the interpretation of the GPR data easy in a civil engineering context. The results were validated with theoretical data.