Novel Design of Optically Transparent Circuit Analog Absorber by Modifying of exponentially tapered edge of element to achieve wider Bandwidth

Document Type : Research Article

Authors

1 Faculty of Technical and Engineering, Electrical Engineering-Telecommunication, Imam Khomeini International University of Qazvin, Iran

2 Faculty of Technical and Engineering, Electrical Engineering-Telecommunication, Imam Khomeini International University of Qazvin, Iran.

Abstract

This paper presents a novel design and analysis of a single-layer, exponentially tapered circuit analog absorber (CAA) that is flexible and optically transparent. By modifying the edge of conventional crossed strips to an exponential taper, a wider bandwidth is achieved, analysed through current distribution and on the top layer of the unit cell. The designed unit cell comprises of ITO-Coated-PET a ground plane and CA absorber layer and a quarter-wavelength PVC dielectric substrate, achieving over 80% transparency and a relative bandwidth exceeding 85%. Comparative analysis with Numerically and experimentally result and conventional CAA unit cells is conducted. Also, the current distribution is expressed mathematically. Parametric studies investigate various design parameters and CA elements to enhance impedance matching and absorption properties across the 2 to 25 GHz frequency range. Challenges such as the impact of layer count, substrate thickness, and analog element type on transparency and absorption are mitigated by optimizing absorber dimensions and employing tapered shapes for strips to widen the bandwidth. This innovative CAA design finds applications in electromagnetic compatibility, radar cross-section reduction, offering a balance between wide bandwidth electromagnetic shielding and absorbing and high optical transparency, suitable for aircraft windshields, fighter canopies, and space station windows end etc.

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