A CRITICAL REVIEW ON THE FABRICATION PROCESSES AND APPLICATIONS OF MICROWAVE DIELECTRIC CERAMICS Ba6- 3xNd8+2xTi18O54

Microwave dielectric ceramics with the compositional formula of Ba 6-3xNd8+2xTi 18O54 (BNT) are attracted material researchers interests due to their wide applications in many areas as mobile and satellite communication systems, antennas, oscillators, filters, wireless communications, and sensors. BNT ceramics are Neodymium modified Barium Titanate materials that have very well in dielectric properties. The excellent properties of BNT ceramics included high dielectric constant, high quality factor, and small temperature coefficient frequency. With these superior advantageous features, this material can be used in various applications. According to review of relevant literature, it has been noticed that BNT ceramics can be prepared by different synthesis techniques and give different information on structural and electrical properties. The fantastic properties of BNT ceramics make them suitable for implementing in difference applications. In antenna field, BNT ceramics are used for dielectric resonator antenna. BNT ceramic also has the potential to replace traditional microstrip line filter as dielectric filter. BNT ceramic is highly useful material for microwave signal source like dielectric oscillator. It finds applications in portable telephone, digital broadcasting, and multilayer capacitors. This material also can be used in satellite comm unication systems. Therefore, this current review focuses on different technique for synthesis of BNT ceramics in literature, their characterization methods, influence of doping on the properties of BNT ceramics and their applications will be discussed.