Microwave dielectric ceramics (MWDC) refers to ceramics that are used in microwave frequency bands (mainly UHF, SHF band, 300MHz ~ 300GHz) as dielectric materials and complete one or more functions. It is a new type of functional ceramic material developed in the past 20 years. It is a key material for the manufacture of microwave dielectric resonators and filters, and has been studied very actively in recent years. On the basis of the original microwave ferrite, the formula and production process have been greatly upgraded to make it have high dielectric constant, low microwave loss, small temperature coefficient and other excellent performance, suitable for the production of modern microwave devices, such as electronic countermeasures, navigation, communications, radar, home satellite live TV receivers and mobile phones in the frequency stabilization oscillator, filter and frequency discriminator, it can meet the requirements of miniaturization, integration, high reliability and low cost of microwave circuits. With the development of mobile communication and modern electronic equipment, the research of microwave dielectric ceramics has attracted more and more attention, bearing the infinite hope of future microwave devices.

Why Use a Dielectric Resonator?

It is with the rapid development of modern communication technology, the particularity of the use requirements of communication equipment makes people have higher and higher requirements for the weight and size of communication system equipment, especially for the miniaturization, portability, high frequency and low power consumption of filters in mobile communication systems. However, the current common filters have their own shortcomings, for example, it is too difficult to realize miniaturization of filters and duplexers composed of microstrip structures and metal resonators; although the surface acoustic wave filter can reduce the circuit size, its application range is limited due to the shortcomings of small power capacity and large insertion loss. Fortunately, with the cross penetration of modern materials science and electronic information science and technology, the development of new materials and manufacturing technology, such as thin film technology, monolithic integrated circuits, MEMS, LTCC and other processes, has greatly promoted the rapid development of microstrip and filter design, processing and application based on thin film technology, all kinds of solid-state micro (chip) medium frequency, high frequency, microwave filter to high performance, low cost, miniaturization, higher frequency and other aspects of rapid development.