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Carbon nanotube and graphene based materials and devices have been extensively studied since they were discovered and are considered as potential building blocks for nano-scale circuits in virtue of their unique mechanical, electrical and thermal properties. Numerous other potential applications in areas ranging from field emission displays, microscopy and scanning/tunneling microscope tips to fuel cells and batteries have been investigated. Many microwave and THz applications have been suggested as well recently, including nano-antennas and nano-interconnects. However, over the microwave and THz regimes, the electrical properties of CNTs are yet to be thoroughly investigated . Characterizing the high frequency properties of these materials is rather difficult, mainly due to the nanometer sized samples and much larger wavelength associated with microwave and THz spectra . In addition, one of the biggest obstacles for massive production of nanotube circuits is the difficulty of separating semiconducting tubes from metallic tubes .