Miniaturized and reconfigurable notch antenna based on a BST ferroelectric thin film

This work deals with the design, realization and characterization of a miniature and frequency agile antenna based on a ferroelectric Ba0,80Sr0,20TiO3 thin film. The notch antenna is loaded with a variable metal/insulator/metal (MIM) capacitor and is achieved by a monolithic method. The MIM capacitance is 3.7 pF, which results in a resonant frequency of 670 MHz compared to 2.25 GHz for the unloaded simulated antenna; the resulting miniaturization rate is 70%. The characterization of the antenna prototype shows a frequency tunable rate of 14.5% under an electric field of 375 kV/cm, with a tunability performance h = 0.04.