37-42.5 Ghz Sixth-Order Symmetric Substrate Integrated Waveguide Bandpass Filter

A sixth-order symmetric Chebyshev bandpass filter applied to the 5G mobile networks is proposed in this paper. The presented BPF based the substrate integrated waveguide (SIW) has low insertion loss, low cost and high selectivity. The even-order Chebyshev polynomial is modified and adopted to analysis the design of the this presented filter. This filter is designed by using a single-layer Rogers RT/Duroid 5880 substrate with thickness of 0.254mm. The area of the presented BPF is 33.36mm X 5mm The simulation results show that the return loss is better than 13 dB, the insertion loss is lower than 0.6 dB, the out-of-band rejection is better than 30 dB in the interval below 35.8GHz and above 46.9GHz. The results show that the proposed even-order Chebyshev polynomial is correct.