The Book End

Broadband Direct-coupled and Matching RF Networks
Thomas R. Cuthbert, Jr.

TRCPEP Publications
224 pages; $69.95
ISBN: 0-9669220-0-X

This practical guide is suitable for engineers and technicians engaged in the design of RF networks that filter and match impedances over wide frequency bandwidths. The networks consist of inductive and capacitive elements, open- and short-circuit stubs and cascade transmission lines, and transform-

ers. This book describes how to design broadband RF filter networks easily using the grid approach to broadband impedance matching (GRABIM), which maximizes or shapes the power transfer between source and load described only by discrete frequency impedance data.

After a brief introduction in Chapter 1, Chapter 2 presents six fundamental filter and matching concepts that are essential to understanding the material that follows. Network response shapes are presented and prototype lowpass and bandpass network topologies are described. Chapter 3 deals with lumped LC direct-coupled filters consisting of structures that couple a cascade of all-series or all-parallel resonators. The process of eliminating passband distortion in a lossless direct-coupled filter is shown. Chapter 4 bridges the gap between restricted direct-coupled network topologies and equal-ripple lowpass and bandpass filters. The behavior of the reflection response of equal-ripple filters and matching networks vs. each network branch value also is shown.

Chapter 5 describes matching networks beginning with the design of lumped-element networks that match resistances at a single frequency using the loaded-Q parameter. The GRABIM approach then is introduced by determining an optimal solution for a chosen network topology using a highly efficient direct search technique. Chapter 6 overviews the GRABIM technique and provides the mathematical and algorithmic details required for programming computer solutions.

The book utilizes numerous examples and offers practical information for engineers and technicians. Several executable programs for PC/DOS computers are available on disk for an additional charge of $19.95.

To order this book, contact:
Thomas R. Cuthbert, Jr.,
975 Marymont Dr.,
Greenwood, AR 72936
(501) 996-5713.

Computer-aided Analysis, Modeling and Design of Microwave Networks: The Wave Approach
Janusz A. Dobrowolski and Wojciech Ostrowski

Artech House Inc.
305 pages plus software; $93, £70
ISBN: 0-89006-669-8

This book presents the theoretical foundation and practical programming implementation of the wave approach to microwave network analysis and design. The book is divided into two major sections: computer-oriented microwave network theory, and a description and user's manual for JADMIC2, a general-purpose computer program for microwave network analysis and design.

After a brief introduction, Chapter 2 describes wave variables and the scattering matrix. Chapter 3 presents a computer-oriented microwave circuit analysis method based on the scattering matrix and involving the scattering parameters of individual circuit elements. Computational algorithms of circuit functions also are presented. Chapter 4 describes the noise analysis method used in the JADMIC2 program. The method is based on the noise wave representation for noise generated in the network.

Chapter 5 presents theory related to the transposed matrix method for sensitivity analysis of microwave networks described by the connection scattering matrix. Derivations of sensitivity expressions for network elements commonly used in microwave circuits are presented. Chapter 6 offers a short description of sparse matrix techniques used in the computer program. Chapter 7 presents the basics of optimization techniques used in CAD of microwave networks, and Chapter 8 addresses time-domain analysis methods of linear microwave networks. Chapter 9 presents theory of balance methods used to find a steady-state response of a microwave network excited by a periodic large signal. Noise parameter analyzers are discussed in the last chapter.

The appendices contain the JADMIC2 program user's manual, and the two attached disks contain the program's open source code. The program performs AC and noise analyses and optimization of the overall scattering parameters and noise figure, and handles any circuit topology using distributed, lumped, passive and active elements.

To order this book, contact:
Artech House Inc.,
685 Canton St.,
Norwood, MA 02062
(781) 769-9750, ext. 4002; or

46 Gillingham St.,
London SW1V 1HH, UK
+44 (0) 171 973 8077.