Preface to the Second Edition
The first edition of “Microstrip Filters for RF/Microwave Applications” was published in 2001. Over the years, this book has been well received and is used extensively in both academy and industry by microwave researchers and engineers. From its~inception to publication, the book is almost 10 years old. While the fundamentals of filter circuit have not changed, further innovations in filter realizations and other applications have occurred, including changes in technology and use of new fabrication processes. There have been recent advances in RF MEMS and ferroelectric films for tunable filters; the use of liquid crystal polymer (LCP) substrates for multilayer circuits, as well as the new filters for multiband and ultra-wideband (UWB) applications.
Although the microstrip remains as a main transmission line medium for these new developments, there has been a new trend of the combined use of other planar transmission line structures, such as co-planar waveguide (CPW), slotline and defected or slotted ground structures, for novel physical implementations beyond single layer in order to achieve filter miniaturization and better performance. Over the years, practitioners have also suggested topics that should be added for completeness, or deleted in some cases, as they were not very useful in practice.
It is in response to these concerns that the 2nd edition of Microstrip Filters for RF/Microwave Applications has been written. The extensively revised ...
