Frequency selective surfaces combining slot and strip arrays in a stratified medium

It is demonstrated that metallic strip arrays can be used to load the slot arrays in a frequency selective surface to compensate for the variation in incident angles. Unlike previous structures which are made up of either strip or slot arrays only, the structure considered consists of both strip and slot arrays in the same frequency selective surface. Combining strip and slot arrays in a frequency selective surface provides additional parameters to control its performance. The transmission coefficients for two closely spaced slot arrays located in free space are obtained. The resonant frequency and bandwidth vary for different incident angles. To reduce this variation, a strip array is inserted between the slot arrays. Finally, results for arrays embedded in dielectric slabs are shown.<>