PURPOSE: To have a large specific dielectric constant (r) and a small temperature coefficient (τf) in resonance frequency by specifying (a-d) by mol% when (a), (b), (c) and (d) are expressed as the respective mol% of CaO, SrO, Bi2O3, TiO2, and adding at least one kind of vanadium oxide, niobium oxide and tantalum oxide to the main gradient.
CONSTITUTION: A dielectric ceramic compound comprising a compound of (a) mol% of CaO, (b) mol% of SrO, (c) mol% of Bi2O3 and (d) mol% of TiO2, wherein the composition ranges are defined as 0≤(a)<30, 0<b≤20, 10≤c≤50, 40≤d≤80, and at least one kind of 2wt.% or less of vanadium (V2O5), 5wt.% of less of niobium oxide (Nb2O5) and 5wt.% or less of tantalum oxide is added to the main gradient of 0<a+b≤30. It is thus possible to make a specific dielectric constant (r) 100 or more and make a temperature coefficient (τf) 100ppm/°C or less in a microwave range from the MHz band to Ghz band.
TSUBOI TAKASHI
ITO HIROYUKI
