Ceramic microwave dielectrics shows that large progress has been made in the past more than 50 years. A series of ceramic dielectric materials have been developed and commercialized. Some new concepts like ULTCC material and cold sintering process have been developed. These new materials and new process make it possible to promote the application of ceramic dielectrics in more emerging fields. While, although large amount of materials with different element compositions, phase compositions, forms and microstructures have been explored, to develop dielectric materials with low dielectric loss and near -zero temperature coefficient for higher frequency applications is still the main theme of ceramic microwave dielectric study. It is still difficult to establish the composition - structure -property relationship to guide new material design due to the complicity of the impact factors of dielectric performance. But, the huge experimental and theoretical data on microwave dielectric ceramics make it possible for researchers to use the emerging technology like machine learning to explore high-performance new microwave dielectric materials.

Chapter Contents:

• 9.1 Introduction
• 9.2 Brief history of the development of microwave ceramic dielectrics
• 9.3 Ceramic dielectrics for millimeter-wave wireless communication
• 9.3.1 Silicates
• 9.3.1.1 Cordierite based ceramics
• 9.3.1.2 Forsterite based ceramics
• 9.3.1.3 Feldspar based ceramics
• 9.3.1.4 Other silicates based ceramics
• 9.3.2 Rock-salt structure ceramics
• 9.3.3 Spinel structure ceramics
• 9.3.4 Other dielectric ceramics for millimeter-wave applications
• 9.4 Low/ultralow-temperature cofired ceramic dielectrics
• 9.4.1 LTCC dielectric materials
• 9.4.2 ULTCC dielectric materials
• 9.4.2.1 Molybdates
• 9.4.2.2 Tungstates
• 9.4.2.3 Tellurates
• 9.4.2.4 Vanadates
• 9.4.2.5 Glass-ceramics/glass+ceramic
• 9.4.3 Cold sintering and RT sintering of ULTCC materials
• 9.4.3.1 Molybdates
• 9.4.3.2 NaCl based composites
• 9.4.3.3 Borates
• 9.5 Summary and outlook
• References

Inspec keywords: dielectric materials; radiocommunication; ceramics

Other keywords: microwave communication; ceramic microwave dielectrics

Subjects: Radio links and equipment