Search

This letter presents a high-efficiency circular-polarized (CP) rectenna at 5.8 GHz within wide input power range featuring low profile and radar cross section (RCS) reduction. Originating from the connection to a branch-line coupler, two identical subrectifiers in parallel combination are capable of extending the input power range and enabling the stability of dc output. The contribution of this combination in the performance of rectenna is experimentally demonstrated and a solution to RCS reduction by means of defected ground structure and complementary split-ring resonators is devised. The measured results show that the rectenna achieves a conversion efficiency of more than $60\%$ within the input power range from 2.2 to 17.6 dBm, and an in-band RCS reduction of 5.1 dB, verifying the applicability of wireless power transfer for CubeSats.

This letter presents a high-efficiency rectifier based on a miniaturized branch-line hybrid coupler (MBLHC), which can be applied to wireless power harvesting (WPH) featuring a wide input power range. Originating from the connection to the MBLHC, two identical subrectifiers are used to achieve less sensitivity to the impedance mismatching, and thus the input power range is extended. For validation, theoretical analysis is carried out and a rectifier working at 5.8 GHz is configured out. The measured results show that the rectifier can achieve a conversion efficiency of more than 60% within the input power range from 2 to 17.5 dBm, and a maximum efficiency of 81% with a more compact size.

With the development of the fifth generation (5G) and the Internet of Things (IoT), wireless charging is driving people’s life. The technology of rectifier is considered to be count. However, the conversion efficiency usually get a peak value at a narrow range of input power, which is not cost-effective. In this paper, a high efficiency rectifier with widening input power range is proposed. The results show that the power range can be widen from 8 to 15 dBm over the efficiency of 60%, of which the peak efficiency is over 72%.

For microwave power transmission technology, improving the efficiency of rectifier can always be the crux of the matter. However, the performance of conventional rectifiers are highly dependent on the input power, and the external structures added together are not convenient for integration. Therefore, in this paper, a miniaturized high efficiency rectifier with wide input power range is proposed. According to the results, over 50% of the efficiency is obtained in a wide range (24.5 dBm and 21.8 dBm for simulated and measured results respectively), where the peak efficiency are 82% and 77% respectively.

With the development of the fifth generation (5G) mobile communication, the demands of the multiband antenna are on the increase [1]. In this paper, we proposed a design of multiband antenna using a pixel patch as a unit which elements are optimized by non-dominated sorting genetic algorithm (NSGA-II). The measured and simulation results presented contain three bands, which highlights the benefits of the antenna design with multiband for use in 5G applications.