The latest developments in science and technology have given rise to a unique invention by the scientists at the Centre for Nano and Soft Matter Sciences (CeNS), Bengaluru. These scientists have developed an invisible shield designed to ward off Electromagnetic Interference (EMI). This center is an autonomous institute functioning under the Department of Science & Technology, Government of India.
Understanding Electromagnetic Interference (EMI)
The concept of EMI involves the emission of electromagnetic energies that lead to disturbances in other electrical machinery and devices. Almost all devices that encompass an electronic circuit can potentially be susceptible to EMI. The interference essentially hampers the functioning of the affected equipment by obstructing, deprecating, and, in worst cases, completely losing data. Electromagnetic interference covers a broad spectrum of the electromagnetic range, including but not limited to radio and microwave frequencies. The International Special Committee on Radio Interference (CISPR) was established in the year 1933 to address the emerging concerns over EMI.
The Role of Metal Mesh Structure
The key to this invention lies in the implementation of a metal mesh structure. The scientists at CeNS developed a copper metal mesh on a polyethylene terephthalate (PET) sheet. Contrary to a continuous film, the metal mesh exhibits a visible transmittance rate of approximately 85%. The term transmittance refers to the amount of light capable of passing through a particular sample, excluding the light absorbed, scattered or reflected. This is generally measured on a percentage scale. Given that it only covers 7% of the substrate area, the metal mesh networks on this substrate are more transparent than continuous film. Not only does the mesh provide superior electromagnetic shielding, but it also does so without compromising on transparency as compared to continuous metal films of equivalent thickness.
Benefits of the Invisible Shield
The primary role of the EMI shield is to contain a device’s energy, preventing it from interfering with other devices and blocking external energy from penetrating. In the absence of such shielding mechanisms, electronics may malfunction or completely cease to operate as intended. Notably, this ‘invisible’ shield has numerous potential applications including its use in various military stealth operations. Additionally, it can be utilized to cover electromagnetic wave emitter or absorber devices without negatively impacting aesthetics.
Apart from the physical shape, reducing the electromagnetic signature – which includes radar waves and radio signals – is a critical aspect for enhancing the stealth capability of weapon platforms. The invention of this invisible shield marks a significant stride in the field of stealth technology and electronics, promising a future where devices function optimally without falling prey to EMI.
In conclusion, the innovative approach of the scientists at CeNS, Bengaluru, offers a solution to one of the major issues faced by devices operating on electromagnetic energy, thereby improving their efficiency and longevity. The invisible shield not only protects these devices from EMI but also broadens the scope for potential applications in the military and other fields.
Source: PIB
