Broadband Rectifier Design using Stub Matching for 0.5-6GHz Wireless Power Transfer

Conventional voltage doubler rectifiers suffer from strong input impedance variation, which restricts bandwidth and limits RF-DC conversion efficiency. Reported wideband designs typically require complex matching networks and exhibit large efficiency fluctuations across frequency. This paper presents a broadband rectifier that employs a simple stub-matching network with minimal interstage matching. The circuit consists of a single short-circuited stub and a virtual battery, introducing negligible loss while stabilising the impedance response. Simulation confirm efficient rectification from 0.5 to 6 GHz, maintaining up to 80% RF-DC conversion efficiency for input powers from −10 dBm to 25 dBm. Compared with conventional approaches, the proposed design achieves wider bandwidth with a flatter efficiency profile and reduced circuit complexity. These results demonstrate a practical and scalable solution for broadband wireless power transfer and RF energy harvesting applications.