Dielectric materials 4 Dielectric substrates Microstrip antennas 3 Microwave antennas 3 Slot antennas 3 Antenna grounds 2 Bandwidth 2 Micro-strip patch antennas 2 Microstrip-patch antenna 2 Relative permittivity 2 Substrates 2 5G mobile communication systems 1 Bandpass filters 1 Characteristic impedance 1 Circular ring resonator 1 Computer software 1 Copper 1 Design Analysis 1 Dielectric-constant measurements 1 Different substrates 1 Directional patterns (antenna) 1 Efficiency 1 Electrical characteristic 1 Feed through 1 Flexible substrate 1 Fractional bandwidths 1 Gain 1 High electrical conductivity 1 Impedance matchings 1 Internet of things 1