Radio frequency Identification 146 Radio frequency identification systems 132 Radio circuits 89 Wireless communication systems 84 Design and construction 79 Radio 34 Microwave communication systems 25 Remote control 24 Automatic tracking 18 Transmitters and transmission 16 Mobile communication systems 15 Data processing 14 Electronic circuit design 13 Microwaves 12 Switching circuits 12 Equipment and supplies 10 Safety measures 10 Antennas (Electronics) 9 Examinations 9 Diodes, Switching 8 Measurement 8 Microwave circuits 8 Physiological effect 7 Programmable controllers 7 Radiation 7 Ultra-wideband devices 7 Aids and devices 6 Inventory control 6 Mobile robots 6