Theme: Metamaterials and Metasurfaces for Applications in Microwave and Millimeter-Wave Technologies
Current Research Directions
Current Research Directions
I. Reconfigurable Intelligent Surfaces (RIS) for Microwave and mm-Wave Frequencies
I. Reconfigurable Intelligent Surfaces (RIS) for Microwave and mm-Wave Frequencies
Overview: RIS are electronically tunable surfaces that can provide variable amplitude and/or phase for desired beam-forming. Unlike phased arrays, they don’t require feed networks. However, the concept of RIS are mostly theoretically explored by the wireless communication community in the direction of channel modeling, channel capacity SNR evaluation, etc, especially for MIMO communications. For the physical implementation of RIS, there exists many exciting problems related to electromagnetics and microwave engineering which are still needed to be addressed. Our related recent works: Reference 1, Reference 2.
II. Scattering and Polarization Control of EM Waves
II. Scattering and Polarization Control of EM Waves
Overview: Scattering reduction is important in many applications, especially for radar signature reduction and stealth. An efficient way to reduce scattering is to use broadband and low profile absorbers. To design broadband absorbers, the existing techniques mostly rely on numerical simulations and parametric optimizations. In this backdrop, we work to provide simple synthesis technique and guidelines to design single layer broadband absorbers/ rasorbers with minimum realized thickness. Polarization conversion has applications in imaging systems, radiometers, advanced sensors, radar, polarization reconfigurable antennas, radar cross section (RCS) reduction, etc. In this area, our focus is to obtain linear-to-circular polarization conversion using metasurfaces and apply them with radiating systems as circular polarization is often preferred in different wireless communications. Our related recent works: Reference 1, Reference 2.
III. Analytical Techniques for Surface Electromagnetics
III. Analytical Techniques for Surface Electromagnetics
Overview: A variety of computational techniques are available to evaluate the interaction of EM waves with periodic structures (FSS and metasurfaces). However, most of these available techniques become complex and time-consuming when a complex-shaped geometry is used in the unit cell. Recently, the trend for using novel passive and active unit elements has increased to enhance the capabilities of metasurfaces. Therefore, we are working to apply generalized impedance boundary conditions (GIBC), generalized sheet transition conditions (GSTC), equivalent circuit models, waveguide-Floquet mapping and other analytical techniques, etc., to analyze and design the metasurfaces efficiently. Our related recent works: Reference 1, Reference 2.
Collaborators
Collaborators
Online Presence
Online Presence
