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A highly-selective, closely-spaced, tri-band bandpass threedimensional frequency selective surface (3D FSS) is proposed based on the topology of the microwave filter in this paper. The unit cell of the proposed 3D FSS is constructed by combining an air-filled square waveguide and a cuboid dielectric resonator. Both top and bottom layers of the dielectric resonator consist of double square loops, while the middle layer contains an embedded square loop. Due to its inner electromagnetic couplingdoi:10.1587/elex.17.20200153 fatcat:xnxlvbvk3jgbxb66lux6tp7i4e