A Novel 3-D Frequency Selective Structure for Radiation Leakage Suppression in Sub-6G Highly Integrated Package

This paper presents a novel three-dimensional frequency selective surface (3-D FSS) dedicated to highly integrated package in Sub-6G communication applications. The structure operates between 3.3 GHz and 3.8 GHz with two stopbands on each side. A stable response under the incident angles up to 50° is shown through an electromagnetic simulator analysis. The in-band insertion loss is less than 0.65 dB and the out-of-band insertion loss is more than 10 dB for both TE and TM polarizations under the incident angle up to 50°. Moreover, this novel structure is insensitive to all polarization and has a unit cell size of 0.07λ. All these results indicate that the proposed FSS is a good candidate for radiation leakage suppression in Sub-6G highly integrated package.