The design of an aperiodic frequency selective surface (FSS) for compact quasi-optical networks is presented in this paper. Using a newly developed Physical Optics (PO)method in conjunction with a direct optimisation approach where all elements are simultaneously optimised, an FSS withan aperiodic element layout operating in several discrete bands over the frequency range 23-230 GHz has been designed. Thedesign procedure and a comparison with an existing periodic FSS designed to meet the same specifications are provided. Thiscomparison indicates that enhanced performance can be obtained using an aperiodic FSS compared to a periodic FSS.
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