| 摘要 |
A dielectric ceramic substrate or block contains, at least, two kinds of metal ions, and a dielectric constant in the substrate or block changes continuously or step by step as a function of position. The metal ions contained in the dielectric ceramic material are, at least, two kinds which are selected from the group consisting of Mg, Ca, Sr, Ba, Zn, Pb, Bi, Y, La, Ce, Nd, Sm, Gd, Er, Ti, Zr, Sn, Si and Mn, and the dielectric constant +531 changes in the range of 7</=+531 </=90. This dielectric ceramic material is used in a dielectric substrate for a stripline device, a dielectric substrate for a monolithic IC and a dielectric block for a polarizer. For example, the dielectric substrate for a stripline device, it is so formed that a dielectric constant at its center portion is constant, and becomes smaller step by step or continuously toward its ends. For forming a stripline on the dielectric substrate, when the characteristic impedance is to be constant, a line width at a center portion of the dielectric substrate is narrow and it becomes wider toward the ends.
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