A wide selection

Frequency selective surfaces are often narrowband and narrow-angle, limiting their use in possible applications. This has been addressed by introducing a guided wave structure, which improves both band and angle response. FSS screens are thin and their thickness is generally a small fraction of the wavelength. To overcome this, previous work has involved stacking a number of screens on top of each other, but what separates the design of the Pennsylvania group is that they have achieved the specified performance characteristics by inserting a guided-wave structure. This structure is inserted between the top and the bottom layers, with radiating elements that have a relatively wide bandwidth as well as wide-angle response.