Microwave Dielectric Ceramic Compositions with High Dielectric Constant

摘要

The present invention relates to a high-frequency dielectric composition which is widely used as parts such as the mobile communication, high frequency communication system of the microwave region of the band-pass filter, a duplexer, an oscillator, such as satellite communication.; In the present invention, each dielectric constant (ε _r) a combination of the different high-frequency dielectric characteristics gateun dielectric with a respective dielectric material, the quality factor (Q · f), the temperature coefficient of resonant frequency ( ) Of curve characteristic such as to obtain the excellent dielectric characteristics are complementary.; A · x 3-component dielectric composition of the present invention _{CaTiO 3 -y · (Li 1/2 Nd} 1/2) TiO 3 -z · (La 1/3 Nd 1/3) TiO 3 (x + y + z = 1.0 ) for each configuration component ratio (x, y, z), by an appropriate combination gateu while a high dielectric constant compared to conventional dielectric composition (ε _r = 125~145) with a stable temperature characteristic at the same time a high quality factor (Q · f = 3,500 to obtain a superior high-frequency characteristics of the dielectric ~5,100 GHz). In addition, Bi ₂ O _3, of the present invention the additive amount (0.01 to 0.1 mol), such as _{PbO x · CaTiO 3 -y · (} Li 1/2 Nd 1/2) TiO 3 -z · (La 1/3 Nd _{1/3) TiO 3 (x + y} + z = 1.0) even when added to a three-component system can be obtained excellent dielectric properties.; A dielectric composition of the present invention can downsize the high-frequency ceramic filter, a duplexer, a resonator such as a ceramic component can be applied to a dielectric and, in particular, having excellent characteristics in some existing composition of the high-frequency components. Can also be used as the temperature coefficient of the dielectric composition is very stable ceramic capacitor materials of the present invention.