Research Article

A Very Compact and Sharp Roll-Off Low-Pass Filter with Four Transmission Zeros

Table 1

Comparison with the reported LPFs.

References RO (dB/GHz)fc (GHz)Stopband Ckt. size ()
Up to (fc)Demon. FBW (%) Rej. (dB)

[3]342.43.495,200.049
[4]682.05120,33.5Large
[5]1301.83.4Unknown0.02
[7]372.54.8115,200.022
[8]2701.05.3135,21.5Large
[11]950.59140,200.022
This work109.30.635114,200.004

RO: roll-off; Demon.: demonstrated; FBW: fractional bandwidth; Rej.: rejection level; Ckt.: circuit.