One Develop PCB Coplanar Waveguidewith 50Ohm impedance. PCB Size is 0.5625"x0.5625x0.020", which is 3Ux3U (1U=0.1875"). We also call this PCB Size CC (C is the third letter to represent 3U). PCB Material is Isola I-TERA MT RF 20mil. This PCB will work over 20 GHz. The width of Strip line is 38mil and spacing is 13mil. This PCB will fit into 6UDD2W6S1P2 enclosure in our web site.