Radio wave propagation Antennas (Electronics) 43 Wireless communication systems 41 Radio 35 Mobile communication systems 28 Mathematical models 26 Antennas 20 Electromagnetic waves 17 Microwaves 15 Transmitters and transmission 14 Adaptive antennas 10 Materials 9 Cellular telephone systems 8 Remote sensing 8 Attenuation 6 Equipment and supplies 6 Mathematics 6 Shortwave radio 6 Cellular radio 5 Effect of radiation on 5 Global Positioning System 5 Microwave heating 5 Radio astronomy 5 Radio waves 5 Dielectrics 4 Electromagnetic fields 4 Electromagnetism 4 Metamaterials 4 Mobile radio stations 4 Radio measurements 4