Industrial Consultancy & Sponsored Research (IC&SR) , IIT Madras
Polarization-independent Frequency Selective Surfaces for Atmospheric Remote Sensing
Categories for this Invention
Category – Atmospheric Remote Sensing
Applications- Radiometers, Spatial filters, phase and control metasurfaces, Satellite based weather forecasting and monitoring
Industry- Remote Sensing, Radar Systems, Satellite Communication
Market – The global remote sensing technology market size and is expected to hit around USD 55.36 billion by 2032, representing a CAGR of 11.79% from 2023 – 2032.
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Problem Statement
- Existing FSS designs are sensitive to the polarization and angle of incidence of EM waves, limiting their effectiveness in diverse remote sensing applications.
- Current FSS configurations, including waveguide and substrate-backed types, face challenges with insertion and reflection losses, affecting performance in ultra-low-power applications.
- There is a need for FSS structures that offer wide operational bandwidth and effective spatial filtering for modern radiometers, addressing the limitations of existing narrowband or multi-band designs.
Technology
- The technology introduces a miniaturized Frequency Selective Surface (FSS) unit cell with a metal ring and dipole structure, designed to reflect specific millimeter wave frequencies while transmitting others with minimal loss.
- The FSS can de-multiplex multiple frequency bands (e.g., 50-60 GHz, 170-195 GHz) for advanced remote sensing applications, with tailored reflection and transmission properties to handle different wavebands effectively.
- The unit cell features a dielectric substrate and metal layer with precise dimensions and materials (e.g., gold, copper), optimizing performance for low-loss operation and wideband frequency separation in millimeter-wave remote sensing.
Key Features / Value Proposition
1. Tri-band Frequency Filtering:
- Provides selective filtering for three distinct frequency bands (50-60 GHz, 87-91 GHz, and 170-195 GHz) with high precision.
2. High Insertion Loss:
- Achieves significant attenuation (≥10 dB) in the reflected bands, enhancing signal clarity and reducing interference.
3. Low Insertion Loss in Pass Band:
- Ensures minimal signal loss (≤0.9 dB) in the pass band, optimizing transmission efficiency.
4. Compact and Miniaturized Design:
- Utilizes miniaturized unit cells (λ0/7 × λ0/7) for space-efficient integration into various systems.
5. Polarization-Insensitive Performance:
- Maintains consistent performance across different polarizations and angles of incidence, ensuring reliable operation in diverse conditions.
6. Enhanced Remote Sensing Capability:
- Suitable for atmospheric remote sensing applications, including temperature profiling and humidity sensing, with high mechanical strength and low fabrication complexity.
Questions about this Technology?
Contact For Licensing
sm-marketing@imail.iitm.ac.in
ipoffice2@iitm.ac.in
Research Lab
Prof. Kavitha Arunachalam
Department of Engineering Design
Prof. C.V. Krishnamurthy
Department Of Physics
Intellectual Property
- IITM IDF Ref. 2214
- IN 531494 – Patent Granted
Technology Readiness Level
TRL – 4
Technology validated in lab scale.