Diseño e implementación de un dispositivo para el cosechamiento de energía de radiofrecuencia en la banda ISM.

Abstract

In the present degree work, the design and implementation of a device for the harvesting of radio frequency energy in the Industrial, Scientific and Medical (ISM) band was carried out. A field intensity measurement campaign was carried out using the NARDA SRM 3006 radiation meter, it was determined that the greatest opportunity for harvesting radio frequency (RF) energy is in the 2.4 GHz ISM band, focusing on the Wi-Fi technology, 2.45 GHz was selected as the central frequency. The device was implemented in FR4 material with a dielectric permittivity of 4.4 and a thickness of 1.6 mm. A microstrip patch antenna was designed fed by transmission line and coupled by insertion, in the stage of rectification used a coupling network, a rectifier circuit and a stage of energy storage, the method of harmonic balance and electromagnetic moment was used, as a rectifying element the Schottky HSMS-2850 diodes were selected. It was made the measurements in the laboratory, the antenna bandwidth of 55.9 MHz, return loss of -24.2 dB and -58 dBm received power at 10 cm from transmitter with power of -10 dBm, the DC voltage measured at the output of the rectifier circuit for different powers RF energy at 0 dBm 113.3 mV, 10 dBm 443.8 mV and 20 dBm 1282 mV, the RF energy was harvested of a Wi-Fi router, at 10 cm a voltage of 510.6 mV, the rectified signal was displayed on the oscilloscope and the operation was verified by lighting a led diode. It is concluded that the device achieves convert radio frequency waves to direct current by harvesting energy from RF waves. It is recommended to integrate the antenna and the rectifier circuit on the same board to avoid energy losses.