This paper presents a novel wideband high gain rectenna (rectifying antenna) for RF energy harvesting. The proposed device consists of a double-sided antenna, a low-pass filter and a doubling rectifying circuit using Shottcky diodes as rectifying elements. It works over the frequency range from 1.9 to 3.2 GHz. The simulated results demonstrate that the maximum rectenna conversion efficiency is nearly 70% around 2.4 GHz with the incident power density of 50 μW/cm 2 . The overall rectenna conversion efficiency within the operational bandwidth is greater than 50%.Index Terms -Rectenna, wireless energy harvesting, dipoles, the antenna with a low-pass filter (ALPF) and rectenna conversion efficiency.
A high-entropy alloy (HEA), CoCrFeNiMn 0.5 Ti 0.5 , is used as a sintering aid for the densification of TiB 2 sintered by spark plasma sintering. The HEA content in the starting TiB 2 -HEA mixture is varied from 0 to 10 wt-%. The microstructure and mechanical properties of the sintered samples are analysed and the optimum HEA content of 10% is found for the preparation of the TiB 2 -HEA ceramics, allowing combining high mechanical properties (Vickers hardness of 2174.64 HV and flexural strength of 427.69 MPa) and high relative density of 99.1%.
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