Negative Group Delay Circuit Based on Microwave Recursive Filters

Table 3

Dimensions of branch-line coupler and quarter-wave transformers for group delay of −1 ns (substrates: Rogers RO3010 with dielectric constant of 10.2 and thickness of 25 mils).

	Branch-line coupler		Quarter-wave transformer
			First stage	Second stage
	TL1, TL2, TL3, TL6, TL7, and TL8	TL4 and TL5	TL9 and TL10	TL11 and TL12
Width (mm)	0.575	1.111	0.417	0.560
Length (mm)	29.034	28.054	33.440	28.000