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Far-Field On-Chip Antennas Monolithically Integrated in a Wireless-Powered 5.8-GHz Downlink/UWB Uplink RFID Tag in 0.18-mu m Standard CMOS
KTH, School of Information and Communication Technology (ICT), Electronic, Computer and Software Systems, ECS.
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2010 (English)In: IEEE Journal of Solid-State Circuits, ISSN 0018-9200, Vol. 45, no 9, 1746-1758 p.Article in journal (Refereed) Published
Abstract [en]

This paper discusses two antennas monolithically integrated on-chip to be used respectively for wireless powering and UWB transmission of a tag designed and fabricated in 0.18-mu m CMOS technology. A multiturn loop-dipole structure with inductive and resistive stubs is chosen for both antennas. Using these on-chip antennas, the chip employs asymmetric communication links: at downlink, the tag captures the required supply wirelessly from the received RF signal transmitted by a reader and, for the uplink, ultra-wideband impulse-radio (UWB-IR), in the 3.1-10.6-GHz band, is employed instead of backscattering to achieve extremely low power and a high data rate up to 1 Mb/s. At downlink with the on-chip power-scavenging antenna and power-management unit circuitry properly designed, 7.5-cm powering distance has been achieved, which is a huge improvement in terms of operation distance compared with other reported tags with on-chip antenna. Also, 7-cm operating distance is achieved with the implemented on-chip UWB antenna. The tag can be powered up at all the three ISM bands of 915 MHz and 2.45 GHz, with off-chip antennas, and 5.8 GHz with the integrated on-chip antenna. The tag receives its clock and the commands wirelessly through the modulated RF powering-up signal. Measurement results show that the tag can operate up to 1 Mb/s data rate with a minimum input power of -19.41 dBm at 915-MHz band, corresponding to 15.7 m of operation range with an off-chip 0-dB gain antenna. This is a great improvement compared with conventional passive RFIDs in term of data rate and operation distance. The power consumption of the chip is measured to be just 16.6 mu W at the clock frequency of 10 MHz at 1.2-V supply. In addition, in this paper, for the first time, the radiation pattern of an on-chip antenna at such a frequency is measured. The measurement shows that the antenna has an almost omnidirectional radiation pattern so that the chip's performance is less direction-dependent.

Place, publisher, year, edition, pages
2010. Vol. 45, no 9, 1746-1758 p.
Keyword [en]
Integrated on-chip antenna, power scavenging, radiation pattern, radio frequency identification (RFID), tag, ultra-wideband (UWB), UWB transmitter, wireless powering
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
URN: urn:nbn:se:kth:diva-29191DOI: 10.1109/JSSC.2010.2055630ISI: 000283166300011ScopusID: 2-s2.0-77956221721OAI: diva2:393918
QC 20110201Available from: 2011-02-01 Created: 2011-01-27 Last updated: 2011-02-01Bibliographically approved

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Baghaei Nejad, MajidZheng, Li-Rong
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Electronic, Computer and Software Systems, ECSElectronic Systems
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