The coaxial cavity filter is the most widely utilized in RF and Microwave solution systems. The coaxial cavity filter has the advantages of good electromagnetic shielding, compact structure, and low passband insertion loss. In the case of capacitive loading, the coaxial cavity filter can be made in a small volume and has the advantages of a high rectangular coefficient and high power capacity.
It is made of the cavity, resonator, tuning screw, connector, cover plate, and coupling line;
The ceramic dielectric filter has advantages in miniaturization, lightweight, low loss, temperature stability, and a lower budget.
The ceramic filter is made from lead zirconate titanate ceramic material. The ceramic material is made into a sheet, coated with silver on both sides as electrodes, and has a piezoelectric effect after dc high voltage polarization.