Broadband Rectenna Arrays for Randomly Polarized Incident Waves

Resistive Impedance Matching Circuit for Piezoelectric Energy Harvesting

“…However, the batteries used to power such devices add to toxic waste, require repeated maintenance (changing or charging the batteries), and often result in volume requirements exceeding the requirements of some applications (Paradiso and Starner, 2005;Hudak and Amatucci, 2008;Mathuna et al, 2008). Energy harvesting from a variety of ambient sources (heat, solar, wind, vibration, and radio frequency radiation) provide possible solutions (Hagerty et al, 2000;Beeby et al, 2006;Singh et al, 2006;Alippi and Galperti, 2008;Lhermet et al, 2008;Torah et al, 2008). Here we focus on harvesting ambient harmonic vibration using the piezoelectric effect (Anton and Sodano, 2007;Priya, 2007).…”

High-power rectifying antennas

“…The design included overvoltage protection and failure-tolerance features. The contiguous dipole rectenna is also under investigation by other researchers [11], [15]. The implementation of this monolithic rectenna, with its large number of interconnected wafer-scale sub-arrays, each with microchannel cooling, will be expensive, and have a long 'lead time'.…”

A Novel Transparent UWB Antenna for Photovoltaic Solar Panel Integration and RF Energy Harvesting

“…This is usually done in two ways: i) to collect and deliver maximum power to the rectifying diode, and ii) to acquire high rectifier conversion efficiency through suppression of harmonics generated by the diode which re-radiate from the antenna as power lost. To maximize the delivered power, antennas arrays [26][27][28][29], broadband and UWB antennas [30][31][32][33][34][35], circularly polarized (CP) antennas [36][37], have been built to increase conversion efficiency. The antenna arrays increase incident power delivered to the rectifier diode by enlarging antenna aperture and increasing antenna gain, while the broadband and UWB antennas enable relatively high RF power to be collectively received from various sources in their frequency range.…”

“…Although, RF harvesting between 2.49-2.58 GHz only is demonstrated here, the CTSA as a UWB antenna is capable of harvesting at various frequencies within its bandwidth range. The CTSA is smaller in size compared to those in [26][27][28][29][30][31][32][33][34][35][36][37][38][39], and has additional advantages as it can scavenge on both sides of the antenna due its omnidirectional characteristic and be aesthetically fitted on to glass panels of windows and buildings. Moreover, using a UWB antenna, the aperture is kept constant at higher frequencies compared to narrowband patch antennas which would shrink in size with increase in frequency.…”