Abstract: A system for interconnecting orthogonally disposed printed circuit boards in first and second stacks comprises first contact members on facing edges of the boards of the two stacks used to interconnect the boards. A mother board is disposed perpendicular to and between the two stacks of boards. Second contact members are disposed on the same facing edges of the boards as the first contact members. They define with the first contact members a series of first multiway plug-in connectors along the respective edge of each board in the first stack and a series of second multiway plug-in connectors along the respective edge of each board in the second stack. The mother board comprises a distribution network in the form of an array of conductive tracks assigned to distributing signals to the boards. The mother board also carries connecting contact members and distribution contact members connected to the distribution network.

Abstract: The input wave guides are oriented towards a perpendicular output wave gu with a semi-reflecting quarter-wave plane reflector disposed at 45.degree. to two progressive reflectors which cause increasing delay with frequency and which are disposed in the line of the input and output wave guides.