New Attitudes to UHF Revealed in Tokyo and Cambridge UK

Major advance by Impinj

Impinj acknowledged the considerable problems with water and metal with conventional (ie “Far Field”) UHF in its presentation but it has now fully proved an alternative, notably for item level tagging, where so called Near Field UHF is used with inductive coupling mimicking the way an HF tag works. Range is modest at no more than 50 centimeters but that is no problem for most item level tagging. The antenna has a simple single turn of printed metal, this being cheaper than the HF alternative which would typically need seven turns and a crossover.