APMC2010

PAs for the next generation wireless communication systems should be efficient as well as linear.

To introduce design technique of the linear PA, the nonlinear characteristics of transistors, i.e., FET and Bipolar are discussed.
Then, the linear PA design procedure is described. The highly efficient switching/saturated PAs become very important technology since advanced architectures can deliver the required linearity while preserving the efficiency.

Those PAs and transmitter architectures are also introduced. To cover the broad area of the PAs, it is assumed that audience has a basic knowledge of the PA design.

After ten years of intense research activities, metamaterials have become one of the most vibrant and promising field of radio science and technology. Following the discovery of novel electromagnetic concepts, such as negative refraction, super-resolution imaging and cloaking, an impressive number of novel metamaterial component, antenna and system concepts and applications have been developed over the past few years.

This course will present an up-to-date overview of metamaterial science and technology. It will first introduce the fundamentals of metamaterials, including basic definitions, historical milestones, an intuitive description of the main metamaterial properties, and the genesis of modern metamaterials.
Next, it will present the two classes of "conventional" metamaterials, the resonant-particle and the transmission-line metamaterials, showing their fundamental differences and similarities, and establishing their theoretical foundations, with a particular emphasis on composite right/left-handed (CRLH) transmission line metamaterials, which have lead to the most significant microwave applications of the field. Upon this basis, a suite of applications will be overviewed, including enhanced-bandwidth and multi-band components, tight broadband couplers, agile power combiners, real-time Fourier devices, smart leaky-wave and resonant antennas, active beam-shaping systems, refractors, meta-substrates and non-reciprocal radomes.
Finally, the novel concept of multi-scale metamaterials, believed by the author to prelude the next generation of metamaterials, will be discussed. Such materials are structured at different scales, the micro, nano and atomic scales, and their simultaneous exploitation of several of these scales leads to unprecedented opportunities for unprecedented microwave devices based on material dispersion, anisotropy and quantum engineering.

This next-generation metamaterials will be illustrated by the example of ferromagnetic nanowire metamaterials, whose unique properties of double ferromagnetic resonance, self-biasing, spin-torque and related novel applications will be briefly presented. Concluding remarks will summarize the course and discuss future directions of the field.