Systems such as the IFDL (in-flight data link) of the F-22 fighter jet, seemed almost a miracle of technology at the time. They were created using waveguides and lens antennas, since high-frequency microcircuits for creating an electronic directional beam did not yet exist. Today, however, such systems may have become even more advanced than the MADL (Multipurpose Advanced Data Link) used in the F-35.