A Wideband Feed Network for Vivaldi Antenna Arrays

Table 1

Parameters for the final feed network.

Symbol	Description	Value (mm)
d1	Distance between ports 2 and 3	35.61
d2	Distance between ports 3 and 4	34
d3	Distance between ports 4 and 5	32.39
Lf1	Length of vertical microstrip line	14
	Length of CPW line	16
Lst	Length of vertical slotline	21.7
Lsub	Substrate length	51.95
R1	Radius of one microstrip line turn section	8.75
R2	Radius of the other microstrip line turn section	6
Rs	Radius of circular slot stub	5
Wm	Width of microstrip line	3.53
Ws	Width of slotline	0.5
Wsub	Substrate width	154.56