Wide Gain-Bandwidth from an Ultrathin High Impedance Surface-Based Leaky Wave Antenna using Multi-Feed Excitation

This paper presents a technique for obtaining wide gain-bandwidth from an ultrathin leaky wave-based high impedance surface (HIS) antenna. By properly selecting multiple feed locations over a linear dogbone-shaped patch array antenna, its gain bandwidth is maximized. Dogbone-shaped patches distributed along the surface of the grounded substrate are able to support a leaky wave. The HIS made of dogbone-shaped patches is directly used as radiator. Different feed locations are investigated and a wide gain-bandwidth of 5.8 GHz or 29.89% is observed with the use of multipoint excitation.