Vivaldi Coplanar-Antipodal Antennas

The stages of refinement of the Vivaldi antenna, which has both coplanar and antipodal radiators, is given, which gives it an advantage over the known Vivaldi antennas. The electromagnetic simulation results obtained with the CST studio suite software were compared with the experimental results of the printed coplanar-antipodal antenna measurements with the Anritsu MS46122A vector analyzer, resulting in a good correlation of results. The ultra-wideband radar antenna has minimal cross polarization and will later be used to emit and receive picoseconds pulses. The design is based on slotted lines or a modified Vivaldi antenna. The maximum achievable gain is 10 dBi in the 6-8 GHz frequency range. The coplanar-antipodal antenna is powered by a matching balloon to which a 50-ohm coaxial line is connected at one end and a 100-ohm antenna at the other. Simple configuration and wide bandwidth make the proposed coplanar-antipodal antenna a good option for versatile communication tasks.Antenna requirements: low cross polarization matching; work in UWB, frequency range 0.5-8 GHz; VSWR≤2.0; flat shape with compact dimensions; low losses; maximum focus, minimum level of side lobes.