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Table 1 Comparison with some prior dual-band BPF

From: Quad-mode dual-band bandpass filter based on a stub-loaded circular resonator

  Center frequency (GHz) Return loss (dB) Insertion loss (dB) 3-dB relative bandwidth (%) Transmission zeros
Filter in [2] 2.4/5.8 20/25 1.4/3.2 12/− 2
Filter in [3] 2.4/5.16 ≥ 12 0.6/1.4 13.7/6.3 2
Filter in [5] 1.7/2.15 15/18 3.5/4.8 6.35/4.6 4
Filter in this paper 1.25/2.0 18/27 0.8/0.5 7.8/10.6 4