The porcelain constituent for high frequency, being the oxide of production manner null of the porcelain for high frequency

摘要

PROBLEM TO BE SOLVED: To obtain a colored porcelain for high frequency having a small dielectric loss in a high frequency region of =30 GHz and a relative dielectric constant regulable in the range of 5-80 by firing at 800-1,000 deg.C. SOLUTION: A compsn. prepd. by adding 0.04-20 wt.% B2 o3 and 0.01-10 wt.% CuO or 0.05-30 wt.% glass contg. SiO2 and B2 O3 , and 0.05-10 wt.% CuO to a multiple oxide whose entire compsn. by atomic ratio is represented by n(Zn1-x Mgx ).(Ti1-y Siy ) (where 0xh0.75, 0y1.0 and 0.14=n=3.5) as a principal component is compacted and fired at 800-1,000 deg.C to obtain the objective brownish-colored porcelain contg. a willemite type crystal phase 2 and at least one among an i-menite type crystal phase 1, a spinel type crystal, phase, a TiO2 crystal phase and an Sin. crystal phase and having such high-frequency characteristics as a dielectric constant of 5-80 and =2010-4 dielectric loss at 30-60 GHz.