Abstract
In this paper, the design, simulation and evaluation of a wide band printed log-periodic dipole antenna array, which could be used to detect the presence of radiolytic components of the ubiquitous water molecule, is presented. The antenna was fabricated on an FR-4 substrate. The design was simulated and the characteristics such as the scattering parameter, VSWR, input impedance, etc. studied over a wide frequency band. The radiation pattern in the azimuth and elevation plane was studied at two different frequencies in the L-band of the microwave spectrum. The antenna has a directive pattern, and shows a linearly polarized response. The antenna could be used to monitor the presence of ionising nuclear radiation that can make the neutral water molecules undergo a breakdown sequence into hydrogen peroxide, hydrogen radicals and assorted oxygen compounds, such as ozone, which when converted back into oxygen releases great amounts of energy. The antenna design shows two resonance peaks that are in the frequencies corresponding to the dissociated components, viz. 1.68 GHz and 1.42 GHz.
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