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

Table 1

Element values and performance indexes of the band-stop filter with different L₁ values when band-pass negative group delay occurs.

C1 (pF)	L1 (nH)	R1, R2 (Ω)	C2 (pF)	L2 (nH)	f0 (MHz)	τ (f0) (ns)	IL (dB)
120	3.9	50	1.6	970	128	−12.41	3.5
120	3.9	50	1.6	470	184	−5.77	3.5
120	3.9	50	1.6	120	363	−1.52	3.5

f₀ is the frequency of the minimum of negative group delay. τ(f₀) is the minimum of negative group delay at the frequency f₀. IL is the insertion loss at f₀.