Electrical characteristic Antenna arrays 1 Antenna parameters 1 Bandpass filters 1 Bandwidth 1 Characteristic impedance 1 Circular ring resonator 1 Collision frequency 1 Collisional plasmas 1 Computer simulation technology (CST) 1 Computer software 1 Conducting medium 1 Dielectric materials 1 Dielectric substrates 1 Directional patterns (antenna) 1 Electromagnetic wave propagation 1 Fractional bandwidths 1 Measurement and simulation 1 Metallic elements 1 Microstrip Technology 1 Microstrip filters 1 Microwave antennas 1 Optical resonators 1 Performance analysis 1 Plasma applications 1 Plasma frequencies 1 Sports 1 Substrates 1 Transmission zeros (TZs) 1 Transmissions 1