Problem 3
To Predict The Electromagnetic Interference Shielding Effectiveness Of Textile Composite Material
Mr. Dinesh Chudasama
Dr. Satyajeet Chaudhari
The trend in today’s electronic devices is more faster. Any electrical or electronic apparatus such as high voltage power lines, radar, communication system, radios, televisions, household appliances, computer, mobile phones etc generates electromagnetic waves, that are produced when an electric field comes in contact with the magnetic field. Today’s high-tech electronic gadgets,not only bring us convenience but also many negative effects. These electromagnetic waves create electromagnetic interference to the electrical circuits and also adversely affect human health after prolong exposure. When electromagnetic waves enter the human body, it will destruct cell’s regeneration of DNA and RNA. Furthermore, it causes cancer, brain tumor, heart attack and skin diseases etc.
Electromagnetic Interference is encountered by all of us in our daily life and are expected to face exponential rise in future due to the growing number of wireless devices and standards including cell phones, GPS, Bluetooth, WIFI, etc. Electromagnetic Interference (EMI) is the disturbance that affects the working of an electrical circuit due to either electromagnetic induction or electromagnetic radiation emitted from an external source. This disturbance may interrupt, obstruct or degrade the effective performance of circuit. The simplest way of protection from electromagnetic waves is to stay away from it but this is not always possible in real life.
The most effective method of protection from electromagnetic waves is the use of shielding or electromagnetic shielding material. Shielding is typically applied to enclosure to isolate electrical devices from the outside world and cable to isolate wire from environment through which the cable runs. Electromagnetic shielding is a conductive barrier that completely envelops an electronic device to protect from environmental interference or to stop emission from the device itself interfering with other devices. In other words, electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. Motivated by the increase of stress over electromagnetic pollution issues arising from the fast-growing development and need for electronic and electrical devices, the demand for material with high electromagnetic interference shielding performance has become more urgently.
The common material used for construction of enclosure for shielding is metal such as copper, brass, aluminium, silver, nickel, stainless steel etc. Although such material has good shielding performance but it has some disadvantages like low elasticity, heavy weight, high costs, easy to corrode etc.
So, there was a need of material which is light weighted, flexible, corrosion resistant and cheap. Textile material fulfils all these requirements. But textile materials are electrically nonconductive. So, it was necessary to make it electrically conductive. These are various methods available for imparting electrical properties to textile material such as magnetron sputtering, coating of fabric with metal, incorporating conductive fibres or yarns in fabric etc.
In our experiment, a commercially available polyester-cotton(PC) blended fabric is chosen and to make the fabric electrically conductive, its surface is coated with silver metal using magnetron sputtering technique.
Three different PC blended fabric sampleswas coated with 1, 3, and 5 micro meter thickness of silver to make fabric electrically conductive and then they were tested as per the ASTM D4935 method for electromagnetic interference shielding effectiveness test.From the experiment it was observed that shielding effectiveness increases by increasing the thickness of silver coating.
Performing the experiment every time, to know electromagnetic interference shielding effectiveness of given material,will be costly and time-consuming process. So, mathematical model and simulation will avoid the actual experimentation and helps in designing the more suitable material in faster way.
Therefore, our objective is to develop the modelrelated to predict electromagnetic shielding effectiveness.We have experimental data available.
Download Presentation