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Polarization Independent Ultra-wideband Meta-material Absorber Using Conductive Ink Resonator

Kumari Bharti, Kumar Abhinav, Kumar Prashant, Singh Mintu

Journal of Telecommunications and Information Technology

2024

nr 1

39--45

A wideband meta-material absorber with square and circular split rings that is based on a frequency selective surface of conductive ink is proposed. With over 90% absorptivity, the structure demonstrates broad absorption for the C, X, KU and K bands, as well as polarization independent characteristics for both TE and TM, at angles of up to 45°. Research has been performed to better understand the absorption phenomenon by looking into real and imaginary permittivity, permeability, normalized impedance, and surface current density. The meta-material absorber (MA) discussed in this study finds use in defense-related applications, such as radar surveillance, stealth technology, terrestrial and satellite communications.

Generalized observer design of index one for descriptor systems with unknown inputs

Kumar Abhinav, Gupta Mahendra Kumar

Archives of Control Sciences

2023

Vol. 33, No. 1

83--99

Generalized observers are proposed to relax the existing conditions required to design Luenberger observers for rectangular linear descriptor systems with unknown inputs. The current work is focused on designing index one generalized observers, which can be naturally extended to higher indexes. Sufficient conditions in terms of system operators for the existence of generalized observers are given and proved. Orthogonal transformations are used to derive the results. A physical model is presented to show the usefulness of the proposed theory.