Isosceles Triangular Cavity Based Dual-Band SIW Filters for 5G Millimeter-wave Systems

A novel dual-band substrate integrated waveguide (SIW) bandpass filter, which is suitable for 5G millimeter wave wireless communication system, is presented in this paper. The filter is based on the TE101 and TE102 modes in a SIW isosceles triangular cavity with small size and compact structure. A row of metal vias are arranged on each side of the isosceles triangle SIW cavity. In order to be equivalent to the electric wall to prevent energy leakage. Metal vias are used to perturb the resonant modes simultaneously. The designed filter is fabricated and the measurement results verify the effectiveness of this design method. The test results show that the filter has the advantages of high selectivity, large bandwidth and low loss. The two passbands centered at 26GHz and 36.5GHz with BW1 = 7.1% and BW2 = 8.2%, the minimum in-band insertion losses are 1.4 and 1.0 dB, respectively. It’s stopband suppression can be lower than -70dB.