Department of nano-micro-antennas and nano-electromagnetic waves (Nano-Micro-Antena)
MIM nano antenna ( frequency range 12 MIM ) nano antenna and frequencies over 30 terahertz
Researcher and author: Dr. ( Afshin Rashid)
Note: The solar light energy absorbed by the nano-antenna is converted by a suitable rectifier. Suitable diodes for this frequency range are 12MIMs.
In the solar rectenna system, millions of nano-antennas are placed next to each other with a suitable rectifier , and each one separately produces electrical energy using sunlight. This diode should be able to work at frequencies of more than 30 terahertz. Schottky diode , which is a semiconductor diode with low voltage drop and relatively fast response speed , has the ability to rectify and detect signals with a frequency of up to 5 terahertz. MIM diode can be used as an alternative to Schottky diode in infrared and visible frequency region due to femtosecond tunneling time and significant increase in response speed . Since nano antennas have the ability to absorb a wide angle, even in the case of oblique solar radiation to the surface of the solar panel, their efficiency is up toA significant limit is maintained. This system can also absorb the energy radiated from the earth, that is, terrestrial radiation that is caused by the daily radiation of the sun to the surface of the earth and occurs in wavelengths of 10 micrometers, i.e. frequencies of about 90 terahertz, for this reason By collecting these radiations during the night or in bad weather conditions, the nanoantennas of the solar system can produce electrical energy.
The combination of optical antennas along with the appropriate rectifier system, which is called Rectenna for short, has been introduced in recent years to convert the solar energy into electrical energy and is rapidly being developed and researched. While the efficiency of common solar cells in the market is around 30% at best, the efficiency of two to three times this amount can be achieved for Recten. It should be mentioned that in recent years, Rectna has been studied especially in the issue of power transmission in the microwave band. For example, in theory , for a single frequency of 9.2 GHz, more than 10% efficiency is predicted . Of course, this is the fact that the practical efficiency of making these materials may be slightly different and should be determined in practice. Dipole antenna with Linear polarization and 2/λ length, which has a relative bandwidth of 11%, will be able to collect about 75.2 pW. For this reason, if using an antenna with double polarization, a power of 5.5 pW will be obtained. Due to the low receiving power of each independent antenna, it is customary to use antenna arrays in this cell, which also has its own rules and methods .
Conclusion :
The conversion of solar light energy absorbed by the nano antenna is done by a suitable rectifier. Suitable diodes for this frequency range are 12MIMs.