Microwave Ring Circuits and Related Structures Second Edition
Ring resonators have been used extensively in microwave circuits such as filters, oscillators, mixers, couplers, power dividers/combiners, antennas and frequency selective surfaces. They are also useful in various techniques for the determination of discontinuity parameters, effective dielectric constant and dispersion and loss, and Q measurements. The objectives of this book are to introduce the analyses and models of the ring resonators and to apply them to the applications of filters, antennas, oscillators, couplers, etc. It is based on the dissertations, theses and many papers published by graduate students at the Electromagnetic and Microwave Laboratory of Texas A&M University.
All of the attractive features of the first edition have remained in the second edition. New analyses, models and applications have been added. To meet the needs of students and engineers interested in this field, the revised book covers ring resonators built in various transmission lines such as microstrip, slotline, coplanar waveguide and waveguide. An introduction on analysis, modeling, coupling methods and perturbation methods is included. In the theory chapter, a new transmission-line analysis pointing out a literature error of the one-port ring circuit is added and can be used to analyze any shapes of the microstrip ring resonator. Moreover, using the same analyses, the ring resonator can be represented in terms of a lumped-element G, L, C circuit. After these theories and analyses, the updated applications of ring circuits in filters, couplers, antennas and oscillators are given. Electronically tunable and switchable ring resonators, using varactors and PIN diodes, are described. Especially, there is an abundance of new applications in passband and stopband filters. These applications are supported by real circuit demonstrations. Extensive additions are given in the filter and coupler design and applications.
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Artech House Inc.
279 pages; $95, £63
The prime objective of this book is to give an overview of MEMS mechanical transducers. In order to achieve this, some background information on the various fabrication techniques and materials that can be used to make such devices is provided. The book also provides a background to some of the basic principles associated with micro-machined mechanical transducers. The majority of the text, however, is dedicated to specific examples of commercial and research devices, in addition to discussing future possibilities. Since packaging is sometimes overlooked in textbooks on MEMS, some of the methods used to provide the interface between the device and the outside world are described. Chapter 1 provides an introduction to MEMS and defines some of the commonly used terms. Chapter 2 commences with a brief discussion of silicon and other materials that are commonly used in MEMS. It then goes on to describe many of the fabrication techniques and processes that are employed to realize micro-engineered devices. Chapter 3 reviews some of the commercial design tools and simulation packages that are widely used by researchers and designers in this field. Chapter 4 describes some of the techniques and structures that can be used to package micro-machined mechanical sensors. It also discusses ways to minimize unwanted interactions between the device and its packaging. Chapter 5 presents some of the fundamental principles of mechanical transduction. This chapter is largely intended for readers who might not have a background in mechanical engineering. The remaining four chapters of the book are dedicated to describing specific mechanical micro-engineered devices, including pressure sensors (Chapter 6), force and torque sensors (Chapter 7), inertial sensors (Chapter 8) and flow sensors (Chapter 9). These devices use many of the principles and techniques described in the earlier sections of the book.
To order this book, contact: Artech House Inc., 685 Canton St., Norwood, MA 02062 (781) 769-9750 ext. 4030; or 46 Gillingham St., London SW1V 1HH UK +44 (0) 207-8750.