RADIO 2012 is the first of a series of conferences to be regularly organized in the Indian Ocean region. The aim is to discuss recent developments, theories and practical applications covering the whole scope of radio-frequency engineering, including radio waves, antennas, propagation, and electromagnetic compatibility. The Local Organizing Committee consisted of scientists from SUPELEC, the University of Mauritius, and the University of Technology, Mauritius. Various members of staff of the University of Mauritius provided help for the organization of the conference. The International Union of Radio Science (URSI) made available technical and financial sponsorship for partial support of young scientists. A number of companies also supported RADIO 2012 ('Platinum': GSMA, ICTA & MMF, 'Gold': CST & FEKO). More than 120 abstracts were submitted to the conference and peer-reviewed by an international scientific committee. RADIO 2012 overall featured six oral sessions, one poster session and two workshops. Three internationally recognized scientists delivered keynote speeches during the conference. The two workshops consisted of both regular and invited papers. A call to extended contributions for publication as a volume in the IOP Conference Series: Materials Science and Engineering (MSE) both on-line and in print, was made. Following the call, thirty-three full papers were received and peer-reviewed by the co-editors and the editorial board. Twenty-seven of them were accepted for publication in this volume.