Microwave Dielectric Ceramics

Dear Colleague,

Microwave dielectric ceramics are widely used for the manufacturing of microwave substrates and components such as capacitors, resonators, filters and antennas in the field of microwave communication. To satisfy miniaturization and integration in the 5G era, low-temperature cofiring ceramics (LTCCs) and high-temperature cofiring ceramics (HTCCs) are required to achieve LTCC components/modules and HTCC substrate/packaging housing, respectively. Generally, a low permittivity can minimize the cross-coupling effect between air and dielectrics and improve signal transmission speed; a high quality factor can increase the frequency selectivity; and a near-zero temperature coefficient of the resonant frequency can ensure the stability of the frequency against temperature. Sometimes, anti-reduction characteristics of the LTCC for multi-layer ceramic capacitors (MLCCs) with base metal electrodes (BMEs, copper/nickel) are also required in order to reduce the cost. Moreover, electrical (dielectric properties, breakdown voltage, insulation resistance), mechanical (flexural strength), and thermal (coefficient of thermal expansion, thermal conductivity) properties should be considered.  

In order to better promote the development and application of microwave dielectric ceramics, this Special Issue on “Microwave Dielectric Ceramics” is being launched in Crystals. It will focus on synthesis procedures, crystal structures, and electrical/mechanical/thermal properties of microwave dielectric materials and their relationships. Original works, perspectives, and reviews for this Special Issue are all welcomed.

Dr. Wen Lei
Dr. Kaixin Song
Guest Editors

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