A novel technique to improve the radiation pattern of TSAs by modifying the substrate

Microwave antennas with wide bandwidth« have many applications in satellite links, sensor systems and radio astronomy applications etc. Tapered slot antennas are often preferred in this frequency range as they easy for circuit integration. Vivaldi antenna is one such structure which has wide band width and end fire Radiation pattern. But all the antenna designs may not yield a perfectly end-fire pattern with no side-lobes. Hence a technique to suppress side-lobes present in the radiation pattern is discussed in this paper. This paper emphasises on usage of dielectric properties of the substrate on which antenna is built to improve the radiation pattern of antenna.