2008: Josh Griffin built a custom 5.8 GHz down-converter and demonstrated tag gains at 5.8 GHz when small, multiple tags are modulated jointly. Thus, Griffin modulation was born!
Josh Griffin demonstrates how the modulation of two antennas beside one another with identical signals significantly improves the backscatter data link (contrary to conventional radio links). Not only does the extra antenna scatter more power (rather than simply re-arrange the gain pattern), but the additional scattered impart peculiar and improved fading behavior to a multipath channel.