There are many kinds of filters, and different types of applications have different frequency ranges and occasions. The dielectric filter is formed by coupling between dielectric resonators. Dielectric resonator filters are widely used in wireless base stations, satellite communications, navigation systems, electronic countermeasures and other systems because of their high Q value, low insertion loss, small size and light weight.5G communications, mobile communication base stations, drones, satellite communications, military radar, radio frequency control, digital mobile TV, Internet of Things and other communications, military and aerospace fields..

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