Radiating elements for multiband base station antennas having cavity phase shifters and related linear array assemblies and base station antennas

A radiating element, comprising:

• a base board printed circuit board that comprises a dielectric substrate and a metal pattern on a first surface of the dielectric substrate, the base board printed circuit board including a slot that extends through the dielectric substrate and the metal pattern;
• a feed stalk printed circuit board that has a base that is inserted through the slot in the base board printed circuit board and a distal end;
• a coupling printed circuit board mounted on the distal end of the feed stalk printed circuit board;
• and
• a metal radiator that is capacitively coupled to the coupling printed circuit board,
• wherein the feed stalk printed circuit includes first and second pairs of ground traces that are galvanically connected to the metal pattern on the base board printed circuit board, and first and second signal traces that are electrically isolated from the base board printed circuit board.