A band-pass frequency selective surface (FSS) design based on additive processing is presented.The traditional FSS is usually processed by PCB (Printed Circuit Board) technology

which is difficult to be compatible with large-area flexible coverage. To this end

this paper proposes an additive processing method based on screen printing and electroplating to realize the processing of the band-pass FSS

and is verified by a design of band-pass FSS with spiral windmill-shaped slot structure. The design and experiment show that the realized band-pass FSS provides a pass-band of 6~8GHz in the C-band

and the minimum insertion loss is about 2.48 dB. The FSS exhibits good mechanical flexibility

and exhibits stable frequency selection characteristics under incident waves with a wide angle of 0~60°and different polarization conditions. This wide angle and polarization stability are indispensable in the application of flexible FSS under conformal coverage conditions. Compared with the traditional PCB process

the band-pass FSS based on additive process proposed not only has low cost and high processing efficiency

but also has the advantages of flexible conformal

polarization and wide-angle stability. It is expected to meet the need for flexible coverage/conformal electromagnetic compatibility and protection.