@misc{ManchandaOkochaRudolph, author = {Manchanda, Prabhav and Okocha, Jonathan and Rudolph, Matthias}, title = {Improved Sensitivity of Zero Bias Diode Power Detectors using Impedance Tuners}, series = {IEEE Microwaves, Antennas, and Propagation Conference (MAPCON)}, journal = {IEEE Microwaves, Antennas, and Propagation Conference (MAPCON)}, isbn = {978-1-6654-5203-8}, doi = {10.1109/MAPCON56011.2022.10047233}, pages = {1261 -- 1266}, language = {en} } @misc{OkochaAndreiRudolph, author = {Okocha, Jonathan and Andrei, Cristina and Rudolph, Matthias}, title = {On the repeatability of low cost varactor—based RF impedance tuners}, series = {2025 55th European Microwave Conference (EuMC)}, journal = {2025 55th European Microwave Conference (EuMC)}, publisher = {IEEE}, address = {Piscataway, NJ}, isbn = {978-2-87487-081-1}, doi = {10.23919/EuMC65286.2025.11234977}, pages = {683 -- 686}, abstract = {This paper introduces a concise methodology for assessing the repeatability of low-cost, varactor-based RF impedance tuners by employing a dB-based metric that quantifies how accurately each tuner reproduces a target impedance over repeated cycles. Both blocked and cyclical measurement strategies are used to highlight large impedance transitions near high-reflection states that exacerbate non-idealities. In addition, the method rigorously characterizes issues such as systematic offsets, drift, and hysteresis, common challenges that can impair tuner performance, allowing targeted improvements. Demonstrations with a BST varactor prototype underscore the importance of identifying and quantifying these effects to ensure consistent tuner performance in real-world RF testing environments.}, language = {en} }