Microwave dielectric ceramics refer to ceramic materials used as dielectric materials in microwave frequency band circuits and complete one or more functions. Microwave dielectric ceramics, as a new electronic material, are used in modern communications as resonators, filters, dielectric substrates, dielectric antennas, dielectric guided wave loops, etc., and are widely used in many fields of microwave technology, such as mobile phones, car phones, cordless phones, TV satellite receivers, satellite broadcasting, radar, radio remote control and so on. Dielectric resonator, dielectric filter, dielectric diplexer, dielectric phase shifter, dielectric antenna, dielectric waveguide circuit.