The Book End

Active and Quasi-optical Arrays for Solid-state Power Combining

Robert A. York and Zoya B. Popovic
John Wiley & Sons Inc.
526 pages; $89.95

The quasi-optical approach is particularly attractive at millimeter and submillimeter wavelengths. Most of the basic components in microwave receivers and transmitters have been demonstrated as quasi-optical circuits, including amplifiers, oscillators, mixers, multipliers and switches.

The book begins by describing the quasi-optical power-combining concept for creating high power, high frequency components. Active integrated antennas (AIA) are detailed, focusing on the design of a single-array element as well as intelligent AIAs. Coupled-oscillator arrays and scanning techniques for creating high power microwave and mm-wave sources from low power, solid-state oscillators are described as well as quasi-optical antenna-array amplifiers. Important issues relating to design, fabrication, measurement and packaging are discussed and several case studies are presented. Multilayer and distributed arrays are addressed and the concept of a multilayer spatial amplifier array is described. Planar quasi-optical power combining (where the beam is confined to two dimensions) is explained and variations to this approach are described.

A grid oscillator that uses the first large-scale, free-space power combiner at microwave frequencies is explained, and various grid oscillator configurations are analyzed. Similarly, the monolithic grid amplifier is detailed, demonstrating appreciable gain and power combining at mm-wave frequencies. The application of active grid arrays to accomplish beam control is covered, and practical examples of switching and phase-shifting grid designs are presented. Frequency conversion grids used in sub-mm-wave applications are detailed. Quasi-optical subsystems are described, and the advantages of integrating quasi-optical components in a system are discussed. Finally, a number of commercial applications of quasi-optics are presented and key power and device issues for these applications are explained.

The book is well illustrated and contains much supporting data. The various contributing authors present a cohesive treatment of this relatively new technology.

To order this book, contact:
John Wiley & Sons Inc.,
605 Third Ave.,
New York, NY 10158
(212) 850-6336 or (800) 225-5945.

Generalized Filter Design by Computer Optimization

Djuradj Budimir
Artech House Inc.
232 pages; $79, £65

Electromagnetic simulators currently are being coupled with sophisticated optimization systems, providing a much more powerful tool for microwave computer-aided filter design. This book describes an optimization-oriented approach for the accurate design of RF, microwave and mm-wave filters. Computer-aided filter design algorithms are presented and examples of their applications are provided. The book is intended for advanced undergraduate and graduate course work and for practicing design engineers.

The first chapter offers a brief introduction to RF, microwave and mm-wave filter CAD, including basic descriptions of electromagnetic simulation and computer optimization. Chapter 2 summarizes transmission lines, lumped elements and resonators, and Chapter 3 discusses the electromagnetic field analysis of discontinuities in E-plane, ridged waveguide and coplanar waveguide filters. A finite-length septum is analyzed and coplanar waveguide discontinuities are discussed.

Chapter 4 explains optimization-based filter design techniques and the differences between various optimization methods. The design of lumped-element filters by optimization is covered in Chapter 5. In addition, the advantages of using these lumped-element filters are discussed and an approximate synthesis-based design procedure is outlined. Chapter 6 describes the design of E-plane filters using optimization. Optimization-based design procedures for ridged waveguide filters are discussed in Chapter 7 and two examples are compared to the results for a conventional E-plane filter.

Chapter 8 describes the design of coplanar waveguide filters using optimization techniques. The final chapter provides the code for various CAD filter programs, including LCFILTER and EPFILTER.

The book is surprisingly concise and easy to follow. It is a good reference text for course work, as well as for engineers engaged in filter design.

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

Portland House, Stag Place,
London SW1E 5XA, UK
+44 (0) 171 973 8077.