Feature Enhancement of Three Log‐Periodic Antennas Based on Antipodal Vivaldi Patch

Today, microstrip antennas have received a lot of attention due to their unique features such as low weight and volume, easy cheap construction, the ability adapt planar structures. Of course, important problem with these is small gain bandwidth. In this paper, bandwidth antenna patch in form Antipodal Vivaldi are improved by using log-periodic Three 8-element structures designed straight-line, U-shaped V-shaped proposed, simulated fabricated. The dimensions , respectively. results measurements show that 3–18, 2.6–18, 2.4–18 GHz respectively, maximum 6.26, 8.3, 7.61 dBi, which has increased approximately 125% compared single element mode from 2.26 4.3 dBi. These quantities among three proposed article, highest (15.6 GHz) (8.3 dBi). it possible achieve more changing angle between branches antenna, but may ruin