Apparatus and method for tuning a resonance frequency

A method comprising:

• providing at least one input electrode configured to receive radio frequency signals;
• providing a graphene foil configured to convert at least part of the radio frequency signals into mechanical energy;
• and
• providing at least one dielectric support element configured to support the graphene foil and spacing apart the at least one input electrode and the graphene foil;
• wherein the graphene foil has piezoelectric properties, wherein the graphene foil comprises a resonance frequency and is configured as a band-pass filter to pass through the radio frequency signals within a predetermined range of the resonance frequency for conversion into mechanical energy.

An apparatus comprising:

• a control element configured to select a frequency band for reception;
• an antenna configured to receive radio frequency signals;
• a band-pass filter configured to filter radio frequency signals within the selected frequency band for further processing, the band-pass filter comprising a micromechanical resonator, wherein the micromechanical resonator comprises:
• at least one input electrode configured to receive the radio frequency signals from the antenna;
• a graphene foil having piezoelectric properties for converting at least part of the radio frequency signals into mechanical energy, wherein the graphene foil comprises a resonance frequency and is configured as a band-pass filter to pass through the radio frequency signals within a predetermined range of the resonance frequency for conversion into mechanical energy;
• and
• at least one dielectric support element configured to support the graphene foil and to space apart the at least one input electrode and the graphene foil;
• wherein the apparatus is adapted to provide a bias voltage to the micromechanical resonator for tuning the resonance frequency of the micromechanical resonator to correspond with the selected frequency band.