Temperature-stable microwave dielectric ceramic LiCaVO4 with low dielectric constant

The invention discloses a temperature-stable microwave dielectric ceramic LiCaVO4 with a low dielectric constant and a preparation method of the temperature-stable microwave dielectric ceramic LiCaVO4. The preparation method comprises the following steps: (1), original powder of Li2Co3, CaCO3 and V2O5 with the purity higher than 99.9% in weight percentage is weighed and blended according to composition of LiCaVO4; (2), the raw materials in the step (1) are subjected to wet ball-milling mixing for 12 h, distilled water is adopted as a ball milling medium, and the materials are dried and then presintered in 750-DEG C air atmosphere for 6 h; (3), a binder is added to powder prepared in the step (2), granulation is performed, then compression molding is performed, and a product is sintered in air atmosphere at 800-850 DEG C for 4 h, wherein the binder adopts a polyvinyl alcohol solution with the mass concentration of 5%, and the adding amount of polyvinyl alcohol accounts for 3% of the total mass of the powder. The prepared ceramic is well sintered at the temperature lower than 850 DEG C, the dielectric constant is 20.3-20.7, the quality factor Qf is as high as 116,000-151,000 GHz, the temperature coefficient of resonance frequency is small, and the ceramic has great application value in industry.