(Communication-electrical nano antennas) performance improvement in nano dipole L/d in nano electric antennas
Researcher and author: Dr. ( Afshin Rashid)
Note: At first glance, nanotube antennas give us the impression that they are similar to Dipole antennas, which are designed in small dimensions. But in fact, it is not the case in the main theory of Dipole antennas to determine the distribution of current on the antenna, where the Dipole radius is larger than the skin depth and also the resistance losses are so low that they can be ignored.
Due to the fact that the nanodipole L/d is significantly reduced, it becomes unusable . In one-dimensional electrical conductors such as nanotubes, the skin-depth mode is completely eliminated. Because here the electrons are only allowed to move They have the length of the conductor and therefore the current distribution is effectively one-dimensional. In addition to the fact that the electrons move in only one dimension, two important Dicker problems also occur, large inductance and resistance. These characteristics create a very different behavior for nanotube antennas compared to classical antennas. The main difference is that the current distribution is alternating with a wavelength that is 100 times smaller than the free space wavelength for a certain thermal frequency. The wavelength of current distribution depends on the wave speed in that mode. If the speed of the wave is the same as the speed of light, the wavelength of the current distribution is the wavelength of electromagnetic waves in free space. On the other hand, the wave speed in nanotubes is about one hundred times lower than the speed of light. This is because in circuit theory, the wave speed is equal to the inverse of the square root of the capacitive capacitance per unit length multiplied by the inductive capacitance per unit length.
In nanocommunications , interaction with electronic nanoparticles based on carbon nanotubes , the signal produced by the carbon nanotube device is changed following the absorption of certain individual molecules. This is because the adsorbent molecule creates a trap state in the carbon nanotube, which makes it conductive. This means that nanotelecommunication devices based on carbon nanotubes are very sensitive. And they can detect a unique amount of single molecules. The ability to characterize single molecules using highly sensitive nanoelectronics is an exciting prospect in the field of sensors, especially for neural and biosensing applications. It is attractive to use acoustic signals to detect molecular activity ((interaction) or (active circuit)).In nanocommunications and interactions with carbon nanotube-based electronic nanoparticles, signal detection sensitivity may be increased through controllable noise generation. These carbon nanotube-based nanotelecommunication devices show that it is possible to identify individual molecules through their unique noise particles in current nanotelecommunication signals. Improved knowledge about the molecular origin and interaction with carbon nanotube-based electronic nanoparticles of noise should lead to the development of electronics that use noise to improve their performance rather than degrade it.
Conclusion :
At first glance, nanotube antennas give us the impression that they are similar to dipole antennas designed in small dimensions. But in fact, it is not the case in the main theory of Dipole antennas to determine the distribution of current on the antenna, where the Dipole radius is larger than the skin depth and also the resistance losses are so low that they can be ignored.
Researcher and author: Dr. ( Afshin Rashid)
Specialized doctorate in nano-microelectronics