Substrate Integrated Waveguide Filter Based on Inductive Post Design

This paper presents a Band Pass Filter (BPF) using substrate integrated waveguide (SIW) technique in the Ka-band frequency range. The device model is designed with an inductive post in a single layer of substrate, which is compact and easy to fabricate. Filter have a center frequency around 31.5 GHz, B.W. = 2 GHz, fractional B.W. = 6.29%, Insertion loss at center frequency is around 0.6 dB & Return loss is better than 22 dB, Stop Band rejection is better than 15 dB at both side of Pass Band. A fabricated model is presented for validation of the simulated filter design. The measured result is in good agreement with the simulated result. The proposed Filter can be used in 5G applications with good performance.