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发表于 2006-12-20 09:51:22
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Preface
Preface
This book examines the recent progress made in the emerging field of
microelectromechanical systems (MEMS) technology in the context of its
imminent insertion and deployment in radio frequency (RF) and microwave
wireless applications. In particular, as the potential of RF MEMS to enable
the implementation of sophisticated, yet low-power, portable appliances that
will fuel the upcoming wireless revolution gains wide recognition, it is
imperative that the knowledge base required to quickly adopt and gainfully
exploit this technology be readily available. In addition, the material presented
herein will aid researchers in mapping out the terrain and identifying
new research directions in RF MEMS. Accordingly, this book goes beyond
an introduction to MEMS for RF and microwaves [which was the theme of
our previous book Introduction to Microelectromechanical (MEM) Microwave
Systems (Artech House, 1999)] and provides a thorough examination of RF
MEMS devices, models, and circuits that are amenable for exploitation in
RF/microwave wireless circuit design.
This book, which assumes basic, B.S.-level preparation in physics or
electrical engineering, is intended for senior undergraduate or beginning
graduate students, practicing RF and microwave engineers, and MEMS
device researchers who are already familiar with the fundamentals of both RF
MEMS and traditional RF and microwave circuit design.
Chapter 1 of RF MEMS Circuit Design for Wireless Communications
starts by clearly stating the ubiquitous wireless communications problem, in
particular, as it relates to the technical challenges in meeting the extreme
levels of appliance functionality (in the context of low power consumption)
demanded by consumers in their quest for connectivity at home, while on
the move, or on a global basis. The chapter continues with a review of the
wireless standards, systems, and traditional architectures, as well as their limitations,
which, in turn, are imposed by those of the conventional RF technologies
they utilize. Finally, it posits the real prospect of RF MEMS as the
technology that can overcome these limitations and thus enable the ubiquitous
connectivity paradigm.
Chapter 2 provides a review of those salient points in the discipline of
RF circuit design that are key to its successful practice and are intimately
related to the successful exploitation of RF MEMS devices in circuits. In particular,
the subjects of skin effect, the performance of transmission lines on
thin substrates, self-resonance frequency, quality factor, moding (packaging),
DC biasing, and impedance mismatch are discussed.
Chapter 3 provides an in-depth examination of the arsenal of MEMSbased
devices on which RF MEMS circuit design will be predicatedónamely,
capacitors, inductors, varactors, switches, and resonators,
including pertinent information on their operation, models, and fabrication.
The chapter concludes with a discussion of a paradigm for modeling RF
MEMS devices using three-dimensional (3-D) mechanical and full-wave
electromagnetic tools, in the context of self-consistent mechanical and
microwave design.
Chapter 4, via a mostly qualitative treatment, provides a sample of the
many novel devices and circuits that have been enabled by exploiting the
degrees of design freedom afforded by RF MEMS fabrication techniquesóin
particular, reconfigurable circuit elements, such as inductors, capacitors, LC
resonators, and distributed matching networks; reconfigurable circuits, such
as stub-tuners, filters, oscillator tuning systems, RF front-ends, and phase
shifters; and reconfigurable antennas, such as tunable dipole and tunable
microstrip patch-array antennas.
Chapter 5 integrates all the material presented up to that point as it
examines perhaps the most important RF MEMS circuitsónamely, phase
shifters, filters, and oscillatorsóvia a number of case studies. These include
X-band and Ka-band phase shifters for phased arrays and radar applications,
film bulk acoustic (FBAR) filters for PCS communications, MEM
resonator-based filters, micromachined cavity- and MEM resonator-based
oscillators, and a MEM varactor-based voltage-controlled oscillator (VCO).
Each case study provides an examination of the particular circuit in terms of
its specification and topology, its circuit design and implementation, its circuit
packaging and performance, and an epilogue on lessons learned. |
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