_ Section Nano antennas (Rectenna)
performance improvement in nanodipole L/d in nanoelectric antennas a i=4>( Rectenna Rectenna)
Researcher and author: Dr. Afshin Rashid
Note: nanotube antennas at a glance First, it gives us the impression that it is similar to the Dipole antenna, which is designed in small dimensions has been But in fact it is not the case. In the main theory of Dipole antennas to determine the current distribution on the antenna, that the Dipole radius is larger than the skin depth and also Resistance losses are so low that they can be ignored.
with noticing that the nanodipole L/d is significantly reduced, it cannot be used . is completely excluded. Because here the electrons are only allowed to move along the conductor string and therefore the current distribution is effectively one-dimensional. In addition to the fact that the electrons only move in one dimension, there are two important issues. Also happens, 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 one-dimensional electric conductors such as nanotubes, the skin depth mode
In nanocommunications Interaction with electronic nanoparticles based on carbon nanotubes The signal produced by the carbon nanotube device following the absorption of specific individual molecules changes found.This is because the absorbing molecule creates a trap state in the carbon nanotube, which makes it conductive. It means that nano telecommunications devices based on carbon nanotubes are very sensitive. And they can detect an unprecedented 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 biosensor applications. Acoustic signals are attractive for detecting 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 of the molecular origin and interaction with nanoparticle-based carbon nanotube-based electronic noise should lead to the development of electronics that use noise to improve their performance rather than degrade it. forgive.
Conclusion :
Nano tube antennas at a glance First, it gives us the impression that it is similar to the Dipole antenna designed in small dimensions . But in fact it is not the case. In the main theory of Dipole antennas to determine the current distribution on the antenna, that the Dipole radius is larger than the skin depth and also Resistance losses are so low that they can be ignored.
Researcher and author: Dr. Afshin Rashid
Specialized doctorate in nano-microelectronics