Multiple beam serial signal distribution in phased array antennas

A radio frequency (RF) interchange comprising:

• a first differential transmission line extending longitudinally between a first serial distribution port and a first feed-through port;
• a second differential transmission line extending longitudinally, parallel to the first differential transmission line, between a second serial distribution port and a second feed-through port;
• a third differential transmission line extending laterally across the first differential transmission line and the second differential transmission line toward a first distribution/combination port;
• a first crossing section in which traces of the first differential transmission line and traces of the third differential transmission line are canted to form respective coupling regions in which positive traces extend in parallel and overlap, and in which negative traces extend in parallel and overlap, wherein the first crossing section is configured, when a first signal propagates on the first differential transmission line, to couple the first signal onto the third differential transmission line;
• and
• a second crossing section in which traces of the second differential transmission line and the traces of the third differential transmission line are canted to form respective isolation regions in which the traces of the second differential transmission line cross orthogonally with the traces of the third differential transmission line, wherein the second crossing section is configured, when a second signal propagates on the second differential transmission line, to isolate the second signal from the third differential transmission line.