Tradeoff Between Impedance Bandwidth and Polarization Purity in Connected Slot Arrays

We present an approach to design wideband arrays of connected slots with artificial dielectric layers (ADLs) that allows to take into account both matching and polarization properties. The slots are fed by parallel plate waveguides (PPW s) that are co-designed with the ADLs to realize the desired matching bandwidth. An equivalent circuit model of the unit cell is derived, including both the feed and the AD Ls, providing a fast and accurate estimation of both the active reflection coefficient and the cross-polarization level. Such model enables a tradeoff between matching and polarization efficiency already at the early stages of the design.