Non-planar printed circuit board (PCB) interposer for doubly curved conformal antenna array

A conformal electronically scanned array (ESA) assembly, comprising:

• at least one printed circuit board (PCB) conformal to a first interconnecting geometry;
• a plurality of antenna elements coupled to the at least one PCB, each antenna element configured for transmission of radio frequency (RF) energy and reception of reflected RF energy;
• a plurality of first conductive pads conformal to the first interconnecting geometry, each first conductive pad conductively coupled to at least one antenna element via the at least one PCB;
• at least one feed board conformal to a second interconnecting geometry, the at least one feed board configured to transmit energy to the plurality of antenna elements and to receive the reflected RF energy from the plurality of antenna elements, wherein the at least one feed board curves according to at least one axis;
• a plurality of second conductive pads conformal to the second interconnecting geometry, each second conductive pad conductively coupled to the at least one feed board;
• a plurality of conductive vias, each conductive via conductively connecting a first conductive pad to a corresponding second conductive pad, each conductive via configured for conveying energy between the feed board and the at least one antenna element;
• and
• at least one rigid interposer disposed between the at least one feed board and the at least one PCB, the at least one rigid interposer fashioned of at least one dielectric material and configured for:
• insulating at least one conductive via;
• and
• physically bridging at least two conductive vias.