A Passive UHF/UWB RFID Tag with Inkjet-Printed Electrochromic Polyimide Display for IoT Application

• This paper proposes a passive Ultra-High Frequency(UHF) Radio-Frequency Identification (RFID) tag withinkjet-printed Electrochromic (EC) polyimide display andUltra-Wideband (UWB) transmitter for information display inthe Internet-of-Things (IoT) - both remotely by transmitting information to backend side and locally by displaying at tag side. The UHF part remotely powers-up and controls the tag asconventional passive RFID tag does. To overcome the limitations of uplink capacity and massive-tag information feedback, UWB transmitter replaces UHF-RFID backscattering to achieve Mbps transmission data rate and 2000 tags/sec tag identification rate. To provide an ambient and direct human-to-device displayinterface, EC display on polyimide substrate is integrated at tagside. Aggressive duty-cycling power management scheme with dual supplies is designed to drive EC display and UWB transmitter under the microwatt level tag power budget through RF energy harvesting. In this scheme, energy for display refreshing is accumulated over multiple power management cycles; energy for UWB transmission is stored over a load capacitor. Single-pixel addressing scheme with minimized pixelsize is proposed to further reduce display power and improve tag sensitivity by exploiting EC display bi-stability. The circuit prototype has been fabricated in 0.18 μm CMOS process. Experimental results demonstrate that the EC display can be refreshed with tag sensitivity (input RF power) of -10.5 dBm at11.7 sec/cm2 update rate, and the UWB transmitter can bepowered up for 2 Mbps pulse rate and 35% operation duty cycle with tag sensitivity of -18.5 dBm.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Elektroteknik och elektronik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Electrical Engineering, Electronic Engineering, Information Engineering (hsv//eng)

Nyckelord

Ultra-High Frequency (UHF) Radio-Frequency Identification (RFID)

Electrochromic (EC) display

passive tag

energy harvesting

Ultra-Wideband (UWB) transmitter

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