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
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
