A first inventive microwave dielectric composition comprises a ceramic composition
represented by AnR4Ti3+nO12+3n, where
a is an alkaline earth metal element, R is a rare earth element and characterized
in that a case satisfying A=Ba and a case of R=La is excluded and the compositional
ratio n=1,2 or 4. A second inventive microwave dielectric composition comprises
a ceramic composition represented by AXR4Ti3+XO12+3X,
where A is an alkaline earth metal element, R is a rare earth element and characterized
in that the compositional ratio X is within a range of 0.5X5 (excluding
X=1,2, 4). A variety of small microwave dielectric resonators having excellent
transmitting/receiving characters can be mass produced inexpensively from that composition.
