Design and analysis of SIW slot antenna sparse arrays

Two types of longitudinal slot antenna sparse arrays based on substrate integrated waveguide (SIW) technology are proposed and investigated. This design method could lead to an enhanced bandwidth and a lower requirement for fabrication accuracy, while preserving acceptable radiation properties. Moreover, it is easy to realize low side-lobe levels (SLL) performance due to the lower internal and external mutual couplings. The full wave simulation results show that the sparse designs are effective and feasible.