Phase Control Using Open-Stubs for Programmable SAW-based RFIDs

Abstract

SAW (surface acoustic wave) tags are for passive RFID (radio frequency identi cation) systems. To overcome the drawbacks of current SAW RFIDs, which cannot be programmed after fabrication, we propose a technique to make the SAW ID tag programmable even after manufacturing. Control of the re ector bus-bar stub was used to change the phase of the re ected signals. The length of the bus-bar stub can be modi ed by line cutting using lasers and/or by connecting two lines by using conductive ink. The proposed SAW ID tag programs data and increases data capability.