Surface Acoustic Wave Filters: Second Edition
446 pages; $99.95, £59.99 • Academic Press
This book expands the coverage of the earlier edition, published in 1985. At that time, many devices had been established in practical electronic systems, including signal processing devices and bandpass filters for communications and television systems. These devices remain in widespread service now. However, the 1980s were something of a watershed for surface waves. The rise of communications systems, such as mobile telephony demanded new capabilities, particularly for low-loss bandpass filters satisfying exacting specifications. The new book includes the recent developments in this technology. The earlier material is described in Chapters 2 to 7. This includes various acoustic waves (Chapter 2), surface excitation (Chapter 3), propagation effects and materials (Chapter 4), quasi-static transducer theory (Chapter 5) and non-reflective bandpass filters (Chapter 6). Devices for correlation, used in pulse-compression radar and spread-spectrum communications are in Chapter 7. These accounts are similar to those of the earlier book, but to allow space for new material, there is some compression and some topics have been omitted. New areas include filters using unidirectional transducers (Chapter 9), waveguiding and transversely-coupled resonators (Chapter 10) and resonator filters (Chapter 11). Preceding these, Chapter 8 describes the theory of reflective transducers and gratings, including analysis using the Reflective Array Model (RAM) and Coupling-of-Modes (COM) theory. At the beginning, Chapter 1 gives a survey of the whole subject. This is intended to be readable independently of the rest of the book. The book is written at a post-graduate level, assuming some familiarity with topics such as matrix algebra and the Y- and S-matrix descriptions for linear devices. However, much of the material should also be comprehensible at an undergraduate level, particularly the survey of Chapter 1.
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St. Louis, MO 63146
RF and Microwave Coupled-line Circuits: Second Edition
R.K. Mongia, I.J. Bahl, P. Bhartia and J. Hong
578 pages; $139, £77 • Artech House
The successful first edition of this book was published in 1999. While the fundamentals of coupled-line circuits have not changed, further innovations in coupled-line filters and other applications have occurred with changes in technology and use of new fabrication processes, such as the use of low temperature cofired ceramic (LTCC) substrates. The first few chapters reflect only minor changes, as these incorporate the fundamentals of microwave transmission lines, networks and coupled lines, which have not changed. Some additions and changes have been made to accommodate the multilayer design of coupled lines for the sake of having a self-contained, complete text. Most of the changes occur in the “Applications” part of the text (i.e. Chapter 8 onward). Thus, Chapter 9, on filters, includes the design of bandstop filters using coupled lines and a discussion of software packages used for filter design, together with their limitations and strengths. Chapters 10 and 11 are new and discuss advanced filter technology and the design of filters using new materials and technologies. Chapter 10 concentrates on coupled-line filters with many specialized characteristics that are often encountered in practice. Chapter 11 takes a different direction, tackling filters using advanced materials and technologies, including superconductor coupled-line filters, micromachined filters, miniature interdigital filters on silicon, LTCC filters which require multilayer coupling, liquid crystal polymer filters and ultra-wideband filters. Chapters 12 and 13 are essentially the former Chapters 10 and 11 with revisions as appropriate and the inclusion of new material to update the chapters and make them current. Chapter 13 covers baluns of different configurations (e.g., microstrip to balanced stripline, planar transmission line and Marchand type) and are discussed in detail.
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