Al2O3 doped Ba0.5Sr0.5TiO3 ~BST! thin films, with different Al2O3 contents, were deposited on ~100! LaAlO3 substrates by the pulsed laser deposition technique to develop agile thin films for tunable microwave device applications. The dielectric properties of Al2O3 doped BST films were determined with a nondestructive dual resonator near 7.7 GHz. We demonstrated that the Al2O3 doping plays a sig...
