Design of a Dual-band Rectenna for Small IoT Terminal

This article presents the design of a dual-band rectenna with a 40 x 30 x 2 mm(3) dimension. The proposed circuit operates at the 925 MHz and 2450 MHz bands in order to harvest the RF power from cellular and ISM communication system. This rectenna consists in 2 main parts such as the rectifier circuit and the metal rimmed antenna. By combining two resonance structures, the dimension of the rectifier part can be minimized while the efficiency always keeps up to 60% for all bands. Moreover, the metal rimmed antenna that is connected to the rectifier part provides a reflection coefficient of 10 dB for 925 MHz and 2450 MHz frequency bands. In addition, with the antenna, a total efficiency of 47% at 925 MHz and more than 80% at 2450 MHz is achieved, which confirm that the proposed rectenna is perfectly suitable for small IoT terminal.