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.
| Original language | English |
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| Patent number | WO2022013572A3 |
| Priority date | 16/07/20 |
| Filing date | 16/07/21 |
| Publication status | Published - 20 Jan 2022 |