Wireless communication systems 251 Design and construction 161 Computer networks 117 Mobile communication systems 104 Radar 103 Security measures 87 Management 85 Mathematical models 80 Signal processing 78 Telecommunication 76 Radio 68 Antennas (Electronics) 67 Data processing 67 Computer software 62 Mathematics 62 Testing 57 Electronics in military engineering 54 Microwave circuits 52 Broadband communication systems 51 Artificial satellites in telecommunication 47 Radio circuits 47 Computer simulation 46 Cellular telephone systems 45 Electromagnetism 45 Computer security 41 Amplifiers, Radio frequency 40 Development 37 Global Positioning System 37 Integrated circuits 37 Telecommunication systems 37