Thin films of La1/2Na1/2TiO3 fabricated by pulsed laser deposition show interesting dielectric properties exhibiting quantum paraelectric-type temperature-insensitive dielectric constant below 50 K. The dielectric constant (epsilon(r)similar to 180) is also very stable under electric bias up to 4x10(4) V/cm. These properties indicate that these films coupled with high temperature superconductors have a great potential for microwave applications. (C) 2000 American Institute of Physics. [S0021-8979(00)07618-0].