Title:
LONG RANGE AMBIENT BACKSCATTER APPARATUS
Document Type and Number:
WIPO Patent Application WO/2022/013572
Kind Code:
A3
Abstract:
In accordance with a first aspect of the present invention, there is provided an ambient backscatter circuit arranged to generate a varying circuit reflection coefficient. The ambient backscatter circuit comprises: a modulation member; a switching device in electrical communication with the modulation member; a first load having a first load reflection coefficient in communication with the switching device; a second load having a second load reflection coefficient in communication with the switching device; and an antenna terminal in communication with the switching device. The modulation member comprises: a baseband processor; and a chirp spread spectrum generator. The baseband processor is configured to generate a signal plan. The chirp spread spectrum generator is configured to generate a modulation signal based on the signal plan. Finally, the switching device is configured to switch, based on the modulation signal, between: the first load; and the second load such that the load reflection coefficient changes at the antenna terminal according to the modulation signal.
Inventors:
DASKALAKIS SPYRIDON-NEKTARIOS (GB)
GOUSSETIS GEORGE (GB)
GOUSSETIS GEORGE (GB)
Application Number:
PCT/GB2021/051835
Publication Date:
March 10, 2022
Filing Date:
July 16, 2021
Export Citation:
Assignee:
UNIV HERIOT WATT (GB)
International Classes:
G06K19/07; H04B1/40; H04B1/59; H04B1/69
Domestic Patent References:
| WO2018075653A1 | 2018-04-26 |
Foreign References:
| EP3264622A1 | 2018-01-03 |
Other References:
DASKALAKIS SPYRIDON NEKTARIOS ET AL: "Ambient Backscatterers Using FM Broadcasting for Low Cost and Low Power Wireless Applications", IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, PLENUM, USA, vol. 65, no. 12, 1 December 2017 (2017-12-01), pages 5251 - 5262, XP011674384, ISSN: 0018-9480, [retrieved on 20171212], DOI: 10.1109/TMTT.2017.2765635
VOUGIOUKAS GEORGIOS ET AL: "24[mu] Watt 26m range batteryless backscatter sensors with FM remodulation and selection diversity", 2017 IEEE INTERNATIONAL CONFERENCE ON RFID TECHNOLOGY & APPLICATION (RFID-TA), IEEE, 20 September 2017 (2017-09-20), pages 237 - 242, XP033250832, DOI: 10.1109/RFID-TA.2017.8098894
BELO DANIEL ET AL: "IQ Impedance Modulator Front-End for Low-Power LoRa Backscattering Devices", IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, IEEE, USA, vol. 67, no. 12, 1 December 2019 (2019-12-01), pages 5307 - 5314, XP011763435, ISSN: 0018-9480, [retrieved on 20191231], DOI: 10.1109/TMTT.2019.2941854
DASKALAKIS SPYRIDON NEKTARIOS ET AL: "Four-PAM Modulation of Ambient FM Backscattering for Spectrally Efficient Low-Power Applications", IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, IEEE, USA, vol. 66, no. 12, 1 December 2018 (2018-12-01), pages 5909 - 5921, XP011699788, ISSN: 0018-9480, [retrieved on 20181210], DOI: 10.1109/TMTT.2018.2879105
ANRAN WANG ET AL: "FM Backscatter: Enabling Connected Cities and Smart Fabrics", ARXIV.ORG, CORNELL UNIVERSITY LIBRARY, 201 OLIN LIBRARY CORNELL UNIVERSITY ITHACA, NY 14853, 23 February 2017 (2017-02-23), XP080748232
VOUGIOUKAS GEORGIOS ET AL: "24[mu] Watt 26m range batteryless backscatter sensors with FM remodulation and selection diversity", 2017 IEEE INTERNATIONAL CONFERENCE ON RFID TECHNOLOGY & APPLICATION (RFID-TA), IEEE, 20 September 2017 (2017-09-20), pages 237 - 242, XP033250832, DOI: 10.1109/RFID-TA.2017.8098894
BELO DANIEL ET AL: "IQ Impedance Modulator Front-End for Low-Power LoRa Backscattering Devices", IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, IEEE, USA, vol. 67, no. 12, 1 December 2019 (2019-12-01), pages 5307 - 5314, XP011763435, ISSN: 0018-9480, [retrieved on 20191231], DOI: 10.1109/TMTT.2019.2941854
DASKALAKIS SPYRIDON NEKTARIOS ET AL: "Four-PAM Modulation of Ambient FM Backscattering for Spectrally Efficient Low-Power Applications", IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, IEEE, USA, vol. 66, no. 12, 1 December 2018 (2018-12-01), pages 5909 - 5921, XP011699788, ISSN: 0018-9480, [retrieved on 20181210], DOI: 10.1109/TMTT.2018.2879105
ANRAN WANG ET AL: "FM Backscatter: Enabling Connected Cities and Smart Fabrics", ARXIV.ORG, CORNELL UNIVERSITY LIBRARY, 201 OLIN LIBRARY CORNELL UNIVERSITY ITHACA, NY 14853, 23 February 2017 (2017-02-23), XP080748232
Attorney, Agent or Firm:
MURGITROYD & COMPANY (GB)
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