“…In practice, ceramics are always needed to be mixed to form multiphase mixtures to stabilize the work frequency, in other words, to obtain a ceramic with a zero temperature coefficient at the resonant frequency [2,[7][8][9][10][11][12][13]. While the composites' dielectric constant can be well predicted by the Maxwell-Wagner formula, the issue of the quality factor calculation has not been well solved yet [3,[14][15][16].…”