Patent ID: 8567232

Claim:
A sensor configured to detect at least first and second gases in a volume that includes a mixture of two or more gases, the sensor comprising: a dielectric substrate; a first resonator on the dielectric substrate, the first resonator including: a first conductive plate on a first surface of the dielectric substrate; and a first nanotube layer arranged on the first conductive plate; wherein the first resonator has a first base resonant frequency selected to cause the first resonator to resonate in response to an interrogation signal when the first resonator is provided in contact with the first gas; and a second resonator on the dielectric substrate spaced apart from the first resonator along the first surface, the second resonator including: a second conductive plate on the first surface of the dielectric substrate; and a second nanotube layer arranged on the second conductive plate; wherein the second resonator has a second base resonant frequency different from the first base resonant frequency, the second base resonant frequency selected to cause the second resonator to resonate in response to the interrogation signal when the second resonator is provided in contact with the second gas.