sm 2 o 3 ceramic type wherein nd 2 o 3 is partly substituted by bi 2 o 3 nd 2 o 3 is partly substituted by ln 2 o 3 and the above substituted ln 2 o 3 is partly substituted by eu 2 o 3 to improve the properties so that u2208 is 82 5 to 92 5 qf is 6000 to 7300 ghz and u03c4f is 10 20 ppm u00b0 c this makes it possible to impart favorable electric characteristics to resonance cavities of various materials and sizes application_number US 70131001 A description the present invention relates to a dielectric ceramic composition whose chief constituents are ba ti sm nd la ce pr bi and o 2 additionally containing eu 2 o 3 and having the properties u2208 82 5 to 92 5 qf 6000 to 7300 ghz u03c4f 10 to u2212 20 ppm u00b0 c which is capable of being employed as a dielectric resonance material or frequency adjusting rod thereof in recent years with the development of new media in the field of electronic technology there has been rapid progress in miniaturization and digitization in particular in the field of communications using microwaves such as satellite communication car phones and mobile telephones advanced miniaturization of components and high levels of reliability.