Abstract
Modern communication systems need low-frequency devices with high gain and wide operational bands. This paper proposes a frequency selective surface (FSS) with a wide passband and low profile, which can be additively manufactured. Each unit of the FSS consists of a centre cube and four surrounding walls with two metal layers covering the top and bottom sides. Through drills are introduced in the design to improve the return loss and the insertion loss in the operational band. The proposed FSS prototype is designed and can be fabricated in a single substrate with a multi-material additively manufacturing technology, and its performance is verified in simulation. It resonates at 3.75 GHz with a fractional bandwidth of 29.3%. Good out-of-band suppression is obtained as well
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