Method for authenticating an object, and mobile consumer device

A mobile consumer device comprising:

• a millimeter-wave transmitter circuit configured to transmit a millimeter-wave transmit signal;
• a millimeter-wave receiver circuit configured to receive a millimeter-wave receive signal from an object;
• a processing circuit configured to capture at least one characteristic of the millimeter-wave receive signal;
• and
• a device configured to generate first comparison information configured to determine an authentication based on the at least one characteristic.

A method for authenticating an object comprising:

• positioning the object which has a first material marking relative to a carrier which has a second material marking so that the first material metamaterial marking is actively coupled to the second material marking;
• transmitting a transmit signal generated by a millimeter-wave transmit circuit in a direction of the first material marking and the second metamaterial marking, wherein the transmit signal is converted into a receive signal based on the actively coupled first and second material markings, wherein the receive signal has a first characteristic;
• receiving the receive signal via a millimeter-wave receive circuit;
• processing the receive signal to capture the first characteristic;
• and
• authenticating the object based on the first characteristic.