The latest breakthrough in the continuing miniaturization of electronic systems is
made possible by the integration of circuit functions and radiating elements into
single modules. In a typical system implementation, electronic circuits and antenna
subsystems are often provided by different equipment vendors. Traditionally,
electronic circuits and antenna systems have been designed by different groups of
designers using different types of design tools, working independently on either side
of a well-defined interface, very often with very little interaction. This approach
leads to separately packaged circuit and antenna subsystems, connected by appropriate
cables or waveguides.
Integration of circuits and antennas into single modules has been made possible
by the common technological features of radio frequency (RF) and microwave
circuits and printed microstrip antennas. The basic microstrip technology used for
the design of microstrip lines and other planar transmission structures (used
extensively in hybrid and monolithic microwave integrated circuits) has been the
cornerstone for the development of microstrip antennas. Using the commonality in
technology to combine circuit and antenna functions in single modules represents a
significant step in further miniaturization of RF and microwave modules for a variety
of applications including active phased arrays and wireless communication systems.
So-called quasi-optic systems that are used by grid arrays to generate high powers at
millimeter wavelengths are another important example. In several of these areas, the
use of circuit–antenna modules is sufficiently well developed that designers are now
requiring computer based tools for analysis, synthesis, and simulation. The need for
a book bringing these aspects together is thus apparent and we hope that this volume
is a timely contribution.