Percorrer por autor "Moura, Tiago"
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- Design of an efficient D-TV energy harvesting system for low-power applicationsPublication . Moura, Tiago; Carvalho, Nuno; Pinho, PedroCollect energy from the surroundings is being biased to power-up devices in order to turn them self-sustainable. On the other hand, the spectrum resultant from the telecommunications tends to progressively increase and becomes wide-reaching, constituting an enormous opportunity to energy harvesting. This work aims to contribute with useful trends into the rectifier design to fulfil energy harvesting purposes. Three rectifiers are designed to collect D-TV spectrum and optimized to operate at low input power conditions. Measurements indicates 63% efficiency at -10.5 dBm input power with the Portuguese D-TV signal.
- High-efficiency D-TV energy harvesting system for low-input powerPublication . Moura, Tiago; Carvalho, Nuno; Pinho, PedroIn this work, a high-efficiency radio-frequency energy-harvesting system that takes use of the Portuguese Digital Television signal (750-758 MHz) to obtain DC power is proposed. To be useful, it is optimized to operate at low-power conditions. For the rectifier, three different solutions are presented: a single-series diode, a single-shunt diode, and a voltage-doubler configuration. The efficiency is similar for the three rectifiers - about 54% with a sine-wave excitation and -10.5 dBm of input power. Field measurements with the voltage-doubler have shown 63% efficiency for the same input power.
- Parasitic stacked slot patch antenna for DTT energy harvestingPublication . Moura, Tiago; Brás, Luís; Pinho, Pedro; Carvalho, Nuno; Gonçalves, RicardoIn this paper a rectangular patch antenna with two slots, integrated with a stacked parasitic antenna, is presented. These techniques allow a bandwidth (BW) and gain enhancement, two of the major limitations of traditional patch antennas. The antenna is designed to operate at 754 MHz for energy harvesting applications, from the Portuguese Digital Terrestrial Television (DTT) signal. The measured antenna BW is 22.5 MHz, representing an enhancement of around 17 MHz in respect to the simulated BW of the corresponding single patch configuration.