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Holey Glide-Symmetric Waveguide Filters for 5G Communication Systems at Millimetre Wave Frequencies

In this paper, we present a holey, fully-metallic, glide symmetric waveguide filter. This solution is low-loss, costeffective, robust and suitable for applications at millimetre wave frequencies (e.g., Ka band). We also explore here the possibility to break the glide symmetry as an additional degree of freedom to control the pass and stopbands. Finally, a denser kind of glide symmetry, named braided glide symmetry, is introduced to enhance the attenuation per unit cell.