Abstract
High efficiency sea-water based reflectarray antenna for maritime wireless communications at 740 MHz is introduced in this paper. The proposed reflectarray consists of 169 unit-cell elements with area of 330.2 × 330.2 cm2. Each unit-cell element consists of a cylindrical dielectric container filled with sea-water and is mounted on a conducting plate. It introduces a reflection phase variation from 0 to 313 degrees. The reflectarray is designed and analyzed using the finite integral technique and compared with that calculated using the finite element method. The radiation characteristics of 13 × 13 sea-water based reflectarray are investigated and presented. The main beam direction of the sea-water based reflectarray is controlled by the water level in each unit-cell element through an electronic valves. The reflectarray introduces a maximum gain of 26.2 dB at 740 MHz and 1-dB gain bandwidth of 50 MHz The effect of temperature variation on the electrical properties of sea-water material and their effect on the radiation characteristics of the water-based reflectarray are introduced.
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