Guest Editorial.

Tuis Mini-Special Issue of this TRANSACTIONS contains four expanded papers from the 2014 International Workshop on Integrated Nonlinear Microwave and Millimetre-wave Circuits (INMMiC), Leuven, Belgium, April 2-4, 2014. INMMiC is a forum for promoting, discussing, and spreading ideas in the field of nonlinear microwave and millimeter-wave circuits and systems. With over 100 attendees, the Technical Program of INMMiC 2014 included two outstanding keynote presentations by Dr. Dylan F. Williams and Prof. Giovanni Ghione; five invited talks given by world-leading distinguished speakers: Prof. Adalbert Beyer, Prof. Ernesto Limiti, Dr. Kate A. Remley, Dr. Earl McCune, and Prof. Wenhua Chen; and 39 high-quality regular papers (out of 50 submissions from 18 countries) presented in both oral (29) and poster (10) formats. Authors of the presented papers were invited to submit an expanded version of their papers for consideration in this Mini- Special Issue. All submissions went through the same review process as regular submissions to this TRANSACTIONS. A total of 11 papers were submitted, and after rigorous reviews, four contributions were accepted for publication. The published papers present new technical contents, beyond the conference papers, derived from the interesting discussions generated at INMMiC 2014. [ABSTRACT FROM AUTHOR]