IEEE Transactions on Electron Devices
Vanadium dioxide (VO2) is a unique phase change material (PCM) that possesses a metal-to-insulator transition property. Pristine VO2 has a negative temperature coefficient of resistance, and it undergoes an insulator-to-metal phase change at a transition temperature of 68°C. Such a property makes the VO2 thin-film-based variable resistor (varistor) a good candidate in reconfigurable electronics to be integrated with different RF devices such as inductors, varactors, and antennas. Series single-pole single-throw (SPST) switches with integrated VO2 thin films were designed, fabricated, and tested. The overall size of the device is 380 μm × 600 μm. The SPST switches were fabricated on a sapphire substrate with integrated heating coil to control VO2 phase change. During the test, when VO2 thin film changed from insulator at room temperature to metallic state (low-resistive phase) at 80 °C, the insertion loss of the SPST switch wasaddition, the isolation of the SPST improved to better than 30 dB when the temperature dropped to 20 °C. These tunable characteristics of the RF switch provide evidence for VO2 as a useful PCM for of applications in reconfigurable electronics.
Copyright © 2015, IEEE
Coplanar waveguide (CPW), metal–insulator transition (MIT), switch, thin film, vanadium dioxide (VO2), variable resistor (varistor)
Air Force Research Laboratory
Pan, KuanChang; Wang, Weisong; Shin, Eunsung; Freeman, Kelvin; and Subramanyam, Guru, "Vanadium Oxide Thin-Film Variable Resistor-Based RF Switches" (2015). Electrical and Computer Engineering Faculty Publications. 99.
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