A Novel Band-Stop Filter with Band-Pass, High-Pass, and Low-Pass Negative Group Delay Characteristics

Table 7

Element values of the high-pass negative group delay circuit with different C₂ values.

C1 (nF)	L1 (nH)	C2 (nF)	L2 (nH)	fopt (kHz)	τ (fopt) (ns)	IL (dB)
1.5	120	15	3.9	670	−7.71	3.1
1.5	120	18	3.9	560	−9.58	3.1
1.5	120	22	3.9	460	−12.07	3.1

f_opt refers to the frequency with the minimum negative group delay, τ(f_opt) corresponds to the minimum negative group delay at frequency f_opt, and insertion loss refers to the loss at f_opt frequency. IL refers to insertion loss.