Effect of Ca+2 doping on microwave dielectric properties of BaTiO3 Perovskites ceramics Humaira Seema, Sarir Uddin, Sumbal Bibi, Nisar Ali, Tahani Mazyad Almutairi and Abdallah A. A. Mohammed Eur. Phys. J. Plus, 138 12 (2023) 1089 Published online: 07 December 2023 DOI: 10.1140/epjp/s13360-023-04748-x