Patent ID: 11963291
Assignee: NXP B.V.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A method for making a package assembly, comprising:
providing printed circuit board substrate comprising at least a first waveguide aperture and a conductive pattern disposed on a first surface of the printed circuit board substrate, where the conductive pattern comprises a plurality of landing pads disposed around peripheral edges of the first waveguide aperture and connected to one another by trace lines;
forming, over the first surface of the printed circuit board substrate, a patterned solder mask layer comprising a plurality of mask openings corresponding in location to the plurality of landing pads and the trace lines; and
attaching a plurality of solder balls to the printed circuit board substrate by affixing a solder ball to each landing pad through a corresponding mask opening so that the first waveguide aperture is surrounded by solder balls having a predetermined minimum spacing distance between adjacent solder balls; and
heating the plurality of solder balls and the printed circuit board substrate to a predefined temperature for a predefined duration to reflow the plurality of solder balls along the trace lines to form a fully closed solder waveguide shielding wall disposed around peripheral edges of the first waveguide aperture.