A W-band Substrate Integrated Waveguide (SIW) Bandpass Filter at 95 GHz for Millimeter Wave Applications

One of the most suitable option for millimeter-wave integrated circuits and systems implementation is Substrate Integrated Waveguide (SIW) Technology. This paper reports a wide band Substrate Integrated Waveguide bandpass filter for W-band applications. The proposed filter is designed by implanting iris discontinuities in periodic topology in both horizontal and vertical directions inside the substrate. The simulation and parametric evaluation of the anticipated filter is done by CST Microwave studio suite software. The performance evaluation and parametric study reveals that due to insertion of metallic holes inside the structure in periodic arrangement with optimum diameter and adequate spacing supports in minimization of losses and obtaining wide bandwidth. The bandpass performance of the proposed filter exhibits an insertion loss (S21) better than 2.1 dB and return loss (S11) less than 27 dB at 95 GHz center frequency. The 3-dB bandwidth obtained is 15 GHz. The proposed structure is appropriate for use in millimeter-wave and RADAR operations.