Abstract
A linearly polarised decoupled dual-dipole rectenna (DDDR) with a novel microstrip-decoupling structure is presented for wireless battery charging applications at the 2.4-GHz industrial, scientific and medical (ISM) band. It consists of decoupled dual dipole (DDD) antenna and a Villard's voltage doubler (VVD) rectifier, and is able to operate close to a conducting surface. The DDD provides 5.6% bandwidth centralised at ∼2.42 GHz and about 4 dBi gain from each element. The half power beam width (HPBW) of this design in the XZ-plane is about 120° from each antenna. High isolation is achieved with only 3-mm edge-to-edge separation. The DDD is 37% smaller than two standard patch antennas located on the same substrate without a decoupling structure. The DDDR is able to fully charge a standard 4.8-V NiMH battery to 5.1 V in 5 h over a distance of 23 cm.
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