Frequency-stable low-dielectric microwave dielectric ceramic material and preparation method thereof

A frequency-stable low-dielectric microwave dielectric ceramic material, consisting of the following components in percentage by mass:

• 70 to 90% of a main-phase ceramic material A, 10 to 30% of an auxiliary-phase ceramic material B and 0 to 1.0% of an oxide sintering aid C, wherein a sum of mass percentage of the main-phase ceramic material A, the auxiliary-phase ceramic material B and the oxide sintering aid C is 100%;
• wherein the main-phase ceramic material A satisfies a chemical formula MgxMeySiO2+x+y, and Me is Co or Zn, the auxiliary-phase ceramic material B is composed of αRO-bRe2O3-cTiO2, wherein R is at least one of Ca or Sr, and Re203 is at least two of Sm2O3, Nd2O3, Y2O3, Al2O3 and La2O3, and the oxide sintering aid C is at least one of MnO2, MnCO3, WO3, and CeO2.