Antenna rectifier using quadrature hybrid coupler for power‐harvesting applications

Abstract

This article presents the design, simulation, fabrication, and measurement of a compact power-harvesting circuit. A quadrature hybrid coupler is used for this harvesting circuit because of its advantageous matching, high isolation, and lossless characteristic. It properly feeds the bridge rectifier, combining the signals received with two antennas. The bridge rectifier component is a turnout full-wave rectification from a two-wire alternative current input. The measurements found output power to be −25.5 dBm using a 5 KΩ load resistor, at 5 GHz. The transmitter antenna input power level is 7 dBm, at 50 cm distance. Both results of the Friis Equation and the measurements are in agreement. According to the results, the power-harvesting circuit can operate for wireless local area network sensor applications.