Abstract
A novel efficient rectenna is proposed in this paper for radio frequency (RF) energy harvest from ambience at 2.45 GHz ISM band. A compact fractal antenna is designed based on a Lévy C curve. The performance of antenna with the ground plane of the conventional geometry, the rectangular-slot geometry and the newly designed geometry is investigated and compared. Besides, a typical rectifier with a 73-degree radial stub matching network is presented. Simulation and experiment are performed to validate the performance of the presented rectenna. The results indicate that the antenna is characterized with a good matching characteristic with a stable omnidirectional radiation pattern. The rectifier has a relatively high efficiency of 30% under the low input power of −10 dBm. The measured maximum RF to DC conversion efficiency of the rectenna is 70% with the output voltage of 2.2 V at 0 dBm when the input power ranging from −20 dBm to 0 dBm.
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