In this work, a novel air-filled substrate-integrated waveguide (AFSIW) filter topology is proposed to overcome the challenges of AFSIW printed circuit board (PCB) fabrication by eliminating small protrusions and feature sizes.The topology is further enhanced with a coupling slot to improve the outof-band rejection by 20 dB.A prototype covering the n257 (26.5 GHz-29.5 GHz) band is synthesized, fabricated and measured to validate the topology, demonstrating its applicability at millimeterwave (mmWave) frequencies with a measured insertion loss of 2.7 dB and out-of-band rejection of over 30 dB.
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Rimbaut et al. (2024) studied this question.
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