* Ultra-wideband Radar Technology

James D. Taylor


424 pages; $99.95
ISBN: 0-8493-4267-8

Ultra-wideband radar (UWB) is finding applications in a number of diverse commercial areas. This book presents theory and ideas for future UWB systems development and shows the potential capabilities.

The book is comprised of 14 chapters written by a number of worldwide experts in the field, including its editor, James Taylor. It begins with a description of the main features of UWB, describing the concept of spectral efficiency and a time-dependant radar range equation. An approach is presented to detecting over-resolved targets by correlating multiple returns over an estimated spatial window about the physical size of the target. The concept of identifying UWB radar targets by correlating target returns against a library of known target signals is explained.

The book goes on the examine some major theoretical issues in receiver design, starting with the concepts of digitizing and recording impulse signals in a single pass. Pulse compression techniques are also covered. How to use pulse compressed signals in radio astronomy is explained, along with what happens to long duration pulse-compressed signals when there are time and frequency shifts caused by target motion. Low power system technology for short range applications is described, and how future smart highway systems can use UWB signals is shown. Future installations of radar systems in automobiles and trucks for station maintenance and collision avoidance are discussed.

The design, performance and applications of a coherent UWB random noise radar is described, and how bandwidth alone determines range resolution is explained. The fundamentals of high power impulse generation is described, and the theory of drift step recovery diodes and other high speed switching devices are explained. Generating high power UWB signals by adding many different waveforms together is discussed, as well as how to build a UWB radar using long duration, narrowband radar signals. How to build a high resolution synthetic aperture radar using step-frequency radar is demonstrated, and bistatic radar is analyzed.

To order this book, contact: CRC Press LLC, 2000 Corporate Blvd. NW, Boca Raton, FL 33431, (561) 994-0555 or (800) 272-7737.

* RF and Microwave Coupled-line Circuits

Rajesh Mongia, Inder Bahl
and Prakash Bhartia

Artech House Inc.

520 pages; $105, £72
ISBN: 0-89006-830-5

This book is a comprehensive text on RF and microwave coupled-line circuits, starting with fundamental theory of coupled structures to the design and analysis of specific components. It emphasizes planar transmission lines, the CAD tools available, the use of full-wave analyses and accurate semiemperical equations for component design, novel structures and configurations, and new applications.

The book begins with the nature of coupled structures, their importance in microwave circuits and some applications. Next, the basic circuit parameters are established and fundamental network analysis tools are introduced along with the properties of two-, three- and four-port networks. The fundamental building blocks for coupled-line circuits (transmission lines) are described, and the characteristics of commonly used planar lines, such as microstrip, coplanar and striplines are covered. The design and performance of forward-directional couplers using asymmetrical coupled lines are discussed, along with coupled-mode theory. Parallel-coupled backward TEM directional couplers using a single section or multisections are discussed, together with limitations and methods for improving coupler directivity. Broadband couplers using multisection couplers are described, along with ones using nonuniform lines. The design and synthesis procedures for nonuniform couplers are outlined, along with other techniques for obtaining broadband performance. Finally the tight coupler is described, including branch-line, rat-race and lumped-element types.

Modern miniature filters are discussed, and an assessment of a number of software packages for filter design is provided. DC blocks, coupled-line transformers, interdigital capacitors, spiral inductors and transformers are analyzed and designed, along with a separate discussion of baluns. The undesirable effects of electromagnetic compatibility/electromagnetic interference encountered by circuits involving coupled lines is described along with ways to mitigate the problem. Finally, designs using multiconductor lines are discussed.

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)20 7596-8750.