The cellular telephone has become a symbol for the rapid change in the communications business. Within this plastic container reside the talents of engineers working in the areas of efficient power supplies, digital circuit design, analog circuit design, semiconductor device design, antennas, linear systems, digital signal processing, packaging, and materials science. All these talents are carefully coordinated at a cost that allows a wide cross section of the world’s population to have available instant communication. The particular aspect of all these that is of primary focus in this text is in the area of analog circuit design with primary emphasis on radio frequency electronics. Topics normally considered in electronics courses or in microwave and antenna courses are not covered here. For example, there is no mention of distributed branch line couplers, since at 1 GHz their size would be prohibitive. On the other hand, topics such as transmission line transformers are covered because they fit so well into this frequency range.

This book is meant for those readers who have at least advanced standing in electrical engineering. The material in this text has been taught as a senior and graduate-level course in radio frequency circuit design at the University of Texas at Arlington. This class has continued to be popular for at least the last 20 years under the guidance of at least four different instructors, two of whom are the present authors. Because of the activity in the communications area, there has been ever greater interest in this subject. It is the intent of the authors, therefore, to update the current text offerings while at the same time avoiding simply reworking a microwave text.

The authors gratefully acknowledge the contribution of Michael Black, Raytheon Systems Company, to the phase lock loop discussion in Chapter 12.

W. ALAN DAVIS

KRISHNA K. AGARWAL