Abstract: An RFID memory device includes two arrays of resonant members. A first array extends in a first member direction and a second array extends in a second member direction. The device includes one or more elements for transforming energy associated with vibration of the resonant members into a change in impedance of an electrical equivalent circuit of the memory device. The magnitude of impedance change caused by resonance of the first resonant members is maximized at a different magnetic field direction to that at which the magnitude of the impedance change caused by resonance of the second resonant members is maximized. Thus, different data may be encoded on each array and separately read. The resonant members may form part of a common electrical conductor that forms a coupling element for coupling with an applied excitation signal and causing vibration of the resonant members.

Abstract: A method of tagging and sterilizing an item, the method including the steps of: providing an item (12) that is to be sterilized and tagged; applying an RFID tagging device (22) to said item, said tagging device including a data store (30) formed from an array of micromechanical resonant members (34), said resonant members being configured to vibrate in accordance with an applied RF signal, so as to provide a data response; and sterilizing said tagged item by autoclaving and/or by irradiation.

Abstract: An RFID memory device includes two arrays of resonant members. A first array extends in a first member direction and a second array extends in a second member direction. The device includes one or more elements for transforming energy associated with vibration of the resonant members into a change in impedance of an electrical equivalent circuit of the memory device. The magnitude of impedance change caused by resonance of the first resonant members is maximised at a different magnetic field direction to that at which the magnitude of the impedance change caused by resonance of the second resonant members is maximised. Thus, different data may be encoded on each array and separately read. The resonant members may form part of a common electrical conductor that forms a coupling element for coupling with an applied excitation signal and causing vibration of the resonant members.

Abstract: A method of tagging and sterilizing an item, the method including the steps of: providing an item (12) that is to be sterilized and tagged; applying an RFID tagging device (22) to said item, said tagging device including a data store (30) formed from an array of micromechanical resonant members (34), said resonant members being configured to vibrate in accordance with an applied RF signal, so as to provide a data response; and sterilizing said tagged item by autoclaving and/or by irradiation.

Abstract: An assay device (1) having a rotatable platform (2) with a test chamber (6) and a sensor (20) which undergoes displacement when subject to a particular substance such as a chemical, biological species or other organism. The sensor is a cantilever beam (21) with a porous section (23) to enhance sensitivity.