A wireless cyber secure zone has been created by controlling RF propagation using directive antennas and noise generation to establish a functional boundary for a wireless network. Directive microstrip patch antennas were constructed in the 2.4-GHz ISM band, and a commercial router was used to generate a wireless network on a specified channel. The FM transmitters for noise generation were set to the same channel in the 2.4-GHz ISM band, and the directive microstrip patch antennas were arranged facing outward creating an inner cyber secure zone for the wireless network. Outside the cyber secure zone, the wireless network was undetectable.
A wireless power transfer system is designed to power remotely placed wireless sensors using UHF band. For receiving purpose, a small and compact, bi-quad antenna is designed which has a fractional bandwidth of 6.89% (443.65 MHz-475.5 MHz). The receiver antenna is uni-directional and has the maximum gain of 9.7 dBi. The overall dimensions of the antenna including the reflective ground plane are 50 cm × 30 cm × 16 cm (0.767λ × 0.46λ × 0.172λ at 460 MHz). A General Mobile Radio Service (GMRS) radio license is obtained and a frequency of 462.55 MHz is used during the test measurement. The maximum achieved effective distance is 150 ft with 3.52 V, which is enough for powering most of the commercial sensors.
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