Radio frequency identification systems 20 Radio frequency 15 Design and construction 12 Wireless communication systems 7 Metal oxide semiconductors, Complementary 6 Amplifiers, Radio frequency 5 Microelectromechanical systems 5 Radio 5 Radio frequency integrated circuits 5 Radio frequency microelectromechanical systems 5 Power amplifiers 4 Radio frequency modulation 4 Dissertations 3 Dissertations, Academic 3 Identification 3 Interference 3 Radio astronomy 3 Antennas (Electronics) 2 Antennas, Dipole 2 Cognitive radio networks 2 Design 2 Equipment and supplies 2 Geographic information systems 2 Low voltage integrated circuits 2 Mobile communication systems 2 Radio frequency allocation 2 Receivers and reception 2 Remote sensing 2 Sensor networks 2 Shortwave radio 2