Microwave Absorbing Kitchen Apron

Categories for this Invention

Category- Advance Material & Manufacturing

Industry Classification:

NIC (2008)- 32902 Manufacture of protective safety equipment.
NAICS (2022)- 339113– Radiation shielding aprons, gloves, and sheeting manufacturing
Applications: Safety aprons, protective gears, Microwave radiation shields

Market drivers:

The global market for aprons was valued at USD 100 Billion in 2023 and is estimated to reach USD 141.56 Billion by 2030, growing at a CAGR of 4.5%

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Problem Statement

Leaks from microwave oven used in the kitchen is potentially dangerous to the health of the chef or people working nearby.
Electromagnetic absorber is a material which absorbs all the radiations falling at the operating frequency while minimizing the transmission and reflection. However, the weight of such absorbers is not suitable for a person to wear it as an apron.
There is a need for an apron that is designed using the concept of metamaterial based absorber and absorbs the microwave at 2.45GHz.

Technology

The invention is a metamaterial based absorber operating at 2.45GHz which is the operating frequency of microwave oven.
The substrate used in this absorber is a flexible cloth type which makes the absorber wearable as safeguard apron
The metamaterial comprises of a metal-dielectric-metal configuration with metal on both sides of a flexible dielectric substrate (cotton with Dielectric constant of 1.91 and loss tangent of 0.07). The first layer is made of a metal such as copper in cross and square pattern. It is preferably of thickness 36μm and conductivity of 5.8x107S/m.
The electromagnetic response by the structure is simulated with CST Microwave Studio. The design shows 99.2% absorption at 2.45GHz.

Key Features / Value Proposition

The metamaterial based microwave absorbing structure is flexible, light weight and wearable and can be used to absorb the microwave leaking from the microwave ovens. Whereas, conventional meta-materials are complex and heavy making them unusable in aprons.
Conventional metamaterials do not act on a number of frequencies and are prone to reflect the incident radiation causing harm to others around. Whereas the invented material effectively absorbs over 99% of the microwave radiation thereby safeguarding the personnel wearing it as well as people around such personnel.
The disclosed absorber possesses preferable qualities such as thin width, polarization insensitivity and wide angle receptivity. angles. The design absorbs up to 90% of the radiation that falls on the apron within 40 degrees of incidence, irrespective of the nature of polarization.

Questions about this Technology?

Contact For Licensing

sm-marketing@imail.iitm.ac.in

ipoffice2@iitm.ac.in

Research Lab

Prof. Subramanian V

Department of Physics

Prof. Sarathi R

Department of Electrical Engineering

Intellectual Property

IITM IDF Ref.1504
IN 513284 Patent Granted

Technology Readiness Level

TRL 2

Technology concept formulated

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