This article presents the design of a dual-band rectenna with a 40 × 30 × 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.

This paper proposes the design of a dual-band integrated rectenna. The rectenna has compact size of 0.4 × 0.3 × 0.25 cm${}^3$ and operates at 925 MHz and 2450 MHz bands. In general, the rectenna consists of two main parts, the metal-rimmed dual-band antenna used for harvesting the radio frequency (RF) signals from the environment and the rectifier circuit to convert these receiving powers to the direct current (DC). Because of the dual resonant structure of the antenna, the rectifier circuit can be optimized in terms of size and the frequency bandwidth, while the conversion efficiencies are always obtained 60% at the RF input power −2.5 dBm and −1 dBm for the lower band and the higher band, respectively. Measured results show that the metal-rimmed antenna exhibits −10 dB reflection coefficient in both desired frequency bands. Moreover, the antenna achieves 47% and 89% of total efficiency respectively at 925 MHz and 2450 MHz, which confirms that the proposed rectenna is well applicable in most of the miniaturized wireless sensor networks and IoT systems.