Rectenna Serves 2.45-GHz Wireless Power Transmission | Systems content from Microwaves & RF
Wireless applications inject a great deal of excess
electromagnetic (EM) energy into the environment—energy which can be
reused if properly recovered. A rectifying antenna, or rectenna as it is
popularly known, is one such means for recovering that energy. In order
to demonstrate the capabilities of such a design, a novel rectenna was
developed for low-power operation at a single
Industrial-Scientific-Medical (ISM) frequency of 2.45 GHz.
The
rectenna consists of a highly efficient photonic-band-gap (PBG)
structure, a microstrip lowpass filter (LPF) with defected ground
structure (DGS) circuitry, and a Schottky diode. To evaluate the
rectenna, it was fabricated on a low-cost FR-4 printed-circuit-board
(PCB) material with relative dielectric constant (εr) of 4.4
in the z-direction at 10 GHz and thickness of 1 mm. As will be shown,
the rectenna achieves RF-to-DC conversion efficiency of 63% when
processing received power of +18 dBm at 2.45 GHz.
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