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Estimation and Control of Total Array RCS of Microstrip Patch Array with Hybrid HIS-based Ground Plane

For a radiating structure such as a patch array placed on an aerospace platform, the radiation mode RCS plays a significant role when compared to the structural mode RCS. It is due to the fact that the structural RCS of a patch array is computed when the antenna impedance is perfectly matched to the feed structure. To achieve a perfectly matched state is practically not possible. The corporate feed structure in the antenna array itself contributes to most of the mismatches. It has been corroborated that a high impedance surface (HIS) plays an important role in controlling the structural RCS of an antenna. The challenge remains to compute the radiation mode RCS of the antenna array. The combination of JC element and square patch arranged in a chessboard configuration is able to provide RCS reduction based on the principle of phase cancellation. However, this configuration can only provide narrow-band RCS reduction.