Extremely High Frequencies

CNT based FETs can outperform the current FET technologies in many ways however, one of the most interesting properties of carbon nanotubes is the ballistic transport of electrons [178], which opens the possibility of constructing FETs that can operate at extremely high frequencies, making them suitable for the next generation electronic devices. Operation of SWCNT transistors has been demonstrated at microwave frequencies (see Fig. 21) [179] and more recently the operation of an SWCNT transistor in the terahertz frequency range was demonstrated [148]. 

D. L. McMakin, D. M. Sheen, J. W. Griffin, and W. M. Lechelt, Extremely high-frequency holographic radar imaging of personnel and mail, Proceedings ofSPIE, vol. 6201, 2006. 

In order to determine uniquely the first five Y coefficients in (10.33) one would need at least five rotational transition frequencies for a given isotopomer, but for a light molecule like LiH these occur at extremely high frequencies. Instead, measurements... 

As was shown by Hills and Djordjevic (1968), it is reasonable to assume that except at extremely high frequencies, Co is negligible under the selected experimental conditions. The rate constant k in Eq. (8.61) will be very high at elevated temperatures and therefore is assumed to be negligible. An analysis based on these approximations gives the series resistance component (the bridge arrangement allowed the series component of the unknown to be measured) of the cell impedance as... 

Mileva, K. Georgieva, B. Radicheva, N. About the biological effects of high and extremely high frequency electromagnetic fields. Acta. Physiol. Pharmacol. Bulg., 2003, 27(2), 89-100. 

Millimeter waves 300 GHz down to 30 GHz (1 mm up to 1 cm) extremely high-frequency... 

Ultra high-frequency (UHF) band Super high-frequency (SHF) band Extremely high-frequency (EHF) band ... 

At extremely high frequencies, the distributed capacitance of each coil begins to play a role, along with the leakage inductance of each coil (see Fig. 10.8). 

Extremely high frequency (EHE) The band of microwave frequencies between the limits of 30 GHz and 300 GHz (wavelengths between 1 cm and 1 mm). 

---