Abstract: An apparatus comprising a first printed circuit board and a second printed circuit board. The first printed circuit board may comprise a plurality of amplifier circuits, a plurality of inputs and a first interconnection network. The second printed circuit board may comprise a plurality of antenna modules and a second interconnection network. The first interconnection network may be configured to connect each of the inputs to a respective one of the plurality of amplifier circuits, and the plurality of amplifier circuits to the second interconnection network. The second interconnection network may be configured to connect the amplifier circuits to the plurality of antenna modules. The first printed circuit board may be affixed to the second printed circuit board using a conductive epoxy material.

Abstract: An apparatus includes a first patch transformer segment, a second patch transformer segment, and a third patch transformer segment. The first, the second and the third patch transformer segments are generally coupled in series in a folded path between a first port and a second port.