Design and Analysis of Ultrathin Multi-Functional Metasurface for Microwave Application

A lot of attention has been focused on radar cross section (RCS) reduction with the rapid development of stealth technology. Metasurface, as an alternative means, has played an important role in terms of low RCS with a low-profile configuration. Two common methods are used for reducing (RCS). One is

Project Title

Design and Analysis of Ultrathin Multi-Functional Metasurface for Microwave Application

Project Area of Specialization

Electrical/Electronic Engineering

Project Summary

A lot of attention has been focused on radar cross section (RCS) reduction with the rapid development of stealth technology. Metasurface, as an alternative means, has played an important role in terms of low RCS with a low-profile configuration. Two common methods are used for reducing (RCS). One is changing the shape of the object and the other is loading radar absorbing materials (RAM) or coatings. The former one redirects the A lot of attention has been focused on radar cross section (RCS) reduction with the rapid development of stealth technology. Metasurface, as an alternative means, has played an important role in terms of low RCS with a low-profile configuration. Two common methods are used for reducing (RCS). One is changing the shape of the object and the other is loading radar absorbing materials (RAM) or coatings. The former one redirects the 

scattered energy away from the source while the latter one transforms the radio frequency energy into heat. The most common drawbacks of RAM have narrow bandwidth, thick, increase weight, costly.

Nevertheless, most of the polarization converters operate at high frequency, with the lowest frequency of working band higher than 12 GHz. Direct scaling-up of the designed structure to make them work in lower frequencies or reducing the thickness of the existing structure may cause deterioration of the polarization conversion performance. Some efforts have shown that the thinner polarization conversion Metasurface working in low frequency can be realized. However, they can only work in a narrow bandwidth which limited their applications. Thus, the design of wide bandwidth polarization conversion Metasurface of ultra-thin thickness with high efficiency still remains a challenging task, especially for low-frequency metasurfaces.

We will design Ultrathin Multi-Functional (cross-polarization conversion (CpC) and linear-to-circular polarization (Lp-to-Cp) conversion vice versa) Metasurface in wide band that will overcome all the aforementioned problem.

Project Objectives

1. Design of a unit cell for the proposed Metasurface, which will work in the frequency range of 2 GHz to 18 GHz.
2. Analysis of incident wave with different polarization modes (transmission mode and reflection mode)
3. Analysis of permeability, permittivity, and impedance of a proposed Metasurface
4. Parametric analysis of the proposed Metasurface
5. Fabrication and testing of proposed Metasurface

Project Implementation Method

In order to design the Ultrathin Multi-Functional Metasurface for Microwave Application, computer simulation technology (CST) Microwave studio(2019) Software will be used and substrate material for proposed Metasurface  will be FR4(LOSSY) with ?r=4.4. For higher frequency designs, low loss substrates will be used. The final designs will be fabricated and results will be experimentally validated.

Benefits of the Project

The proposed Metasurface will be utilized in different areas, some of them are given below;

1. Multi-Function Metasurface

2. Defense application

• Air born
• Marine
• Surveillances
• Invisibility

3. Antenna design (gain and bandwidth enhancement).

4. Radar cross section Reduction.

5. Possible utilization in communication, Military, and Medical diagnosis.

Technical Details of Final Deliverable

The expected deliverables at the end of the project are:

Prototypes of Multi-functional metasurface,, fabricated using PCB technology. For lower frequencies (<20 GHz) FR4 substrate of relative permittivity 4.3 and thickness 1.6 mm will be used. For higher frequency bands (>20 GHz), low loss substrates such as RT Duroid or F4B having dielectric constant of 2.2 and optimum thickness 0.5-3 mm will be used.

A periodic array of 6 x 6 inches or 12 x 12 inches surfaces will be fabricated for both low and high frequency band scenarios.

The surfaces will be tested in far-field facility, where two high-gain broadband horn antennas will be used to transmit and receive the electromagnetic waves.

Final Deliverable of the Project

HW/SW integrated system

Core Industry

Telecommunication

Other Industries

IT , Others , Health , Security , Telecommunication

Core Technology

Others

Other Technologies

Others

Sustainable Development Goals

Industry, Innovation and Infrastructure

Required Resources

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