The recent rapid progress in wireless telecommunication, including the Internet of Things, 5th ge... more The recent rapid progress in wireless telecommunication, including the Internet of Things, 5th generation wireless systems, satellite broadcasting, and intelligent transport systems has increased the need for low-loss dielectric materials and modern fabrication techniques. Oxide ceramics for dielectric resonators and substrates, LTCC and ULTCC tapes for substrates, polymer ceramic composites for printed circuit boards, elastomer-ceramic composites for flexible electronics, dielectric inks, EMI shielding materials, microwave ferrites, etc. are critical for these applications, and a full understanding of their crystal chemistry is fundamental for future developments. Properties of microwave ceramics depend on several parameters including their composition, the purity of starting materials, processing conditions, crystal structure, and their ultimate densification/porosity. The methods commonly employed for measuring the microwave dielectric properties are briefly described here. The important polymer-ceramic composites, elastomer-ceramic composites, glasses and glass ceramics, LTCC tapes, ULTCC materials, tuneable microwave dielectrics, electromagnetic interference shielding materials, microwave ferrites, and dielectric inks are discussed in the book, along with the modelling of microwave dielectric properties of composites. These materials have excellent electrical, dielectric, and thermal properties and have enormous promise especially in wireless communication, flexible electronics, and printed electronics. This book discusses the various attempts reported to solve problems of materials chemistry and crystal structure, doping, substitution, and composite formation, highlighting the processing techniques, morphology influences, and applications of microwave materials. The book summarizes many of the recent technical research accomplishments in the area of microwave dielectrics and applications. A table listing about 4300 low-loss dielectric ceramics with relative permittivity, quality factor, temperature coefficient of resonant frequency, crystal structure, sintering temperature, measurement frequency, and references are given in the appendix; therefore, this book is unique, with contributions from experts in both dielectric materials research and application. This book presents a comprehensive view of all aspects of microwave materials and applications, making it useful for scientists, industrialists, engineers, and students working on current and emerging applications of wireless communications and consumer electronics.
Electromagnetic crystals have potential applications from microwave to optical frequencies. At pr... more Electromagnetic crystals have potential applications from microwave to optical frequencies. At present, several methods can be applied to fabricate these structures, for example, stereolithography and wafer etching. In this work, extrusion freeforming, one of the linear solid freeforming methods, was used to fabricate electromagnetic crystals and the forming, drying, debinding and sintering stages are described. This method allows structures to be designed on a computer file and rendered directly as physical objects so that prototypes can be created quickly. A wide range of ceramic powders can be used so that dielectric constant and loss factor can be tailored. Structures with deliberate defects such as missing filaments or circular structures can be made.
The recent rapid progress in wireless telecommunication, including the Internet of Things, 5th ge... more The recent rapid progress in wireless telecommunication, including the Internet of Things, 5th generation wireless systems, satellite broadcasting, and intelligent transport systems has increased the need for low-loss dielectric materials and modern fabrication techniques. Oxide ceramics for dielectric resonators and substrates, LTCC and ULTCC tapes for substrates, polymer ceramic composites for printed circuit boards, elastomer-ceramic composites for flexible electronics, dielectric inks, EMI shielding materials, microwave ferrites, etc. are critical for these applications, and a full understanding of their crystal chemistry is fundamental for future developments. Properties of microwave ceramics depend on several parameters including their composition, the purity of starting materials, processing conditions, crystal structure, and their ultimate densification/porosity. The methods commonly employed for measuring the microwave dielectric properties are briefly described here. The important polymer-ceramic composites, elastomer-ceramic composites, glasses and glass ceramics, LTCC tapes, ULTCC materials, tuneable microwave dielectrics, electromagnetic interference shielding materials, microwave ferrites, and dielectric inks are discussed in the book, along with the modelling of microwave dielectric properties of composites. These materials have excellent electrical, dielectric, and thermal properties and have enormous promise especially in wireless communication, flexible electronics, and printed electronics. This book discusses the various attempts reported to solve problems of materials chemistry and crystal structure, doping, substitution, and composite formation, highlighting the processing techniques, morphology influences, and applications of microwave materials. The book summarizes many of the recent technical research accomplishments in the area of microwave dielectrics and applications. A table listing about 4300 low-loss dielectric ceramics with relative permittivity, quality factor, temperature coefficient of resonant frequency, crystal structure, sintering temperature, measurement frequency, and references are given in the appendix; therefore, this book is unique, with contributions from experts in both dielectric materials research and application. This book presents a comprehensive view of all aspects of microwave materials and applications, making it useful for scientists, industrialists, engineers, and students working on current and emerging applications of wireless communications and consumer electronics.
Electromagnetic crystals have potential applications from microwave to optical frequencies. At pr... more Electromagnetic crystals have potential applications from microwave to optical frequencies. At present, several methods can be applied to fabricate these structures, for example, stereolithography and wafer etching. In this work, extrusion freeforming, one of the linear solid freeforming methods, was used to fabricate electromagnetic crystals and the forming, drying, debinding and sintering stages are described. This method allows structures to be designed on a computer file and rendered directly as physical objects so that prototypes can be created quickly. A wide range of ceramic powders can be used so that dielectric constant and loss factor can be tailored. Structures with deliberate defects such as missing filaments or circular structures can be made.
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