... over the DTV band (1), and is significantly larger than in the case of narrow band cellular energy harvesting. Sustainable Energy Harvesting Technologies – Past, Present and Future 238 ... spectrums for DTV and Cellular signals are presented as shown in Fig. 1 to show on the potential for energy- harvesting in Sustainable Energy Harvesting Technologies – Past, Present and Future 244 ... higher frequency and efficiency rectenna design is presented in [6]. Sustainable Energy Harvesting Technologies – Past, Present and Future 234 McCormick, M. (2007), Ocean wave energy conversion,...