S-Parameter Analysis of Three-Layered Aperture Coupled Antenna with a Flame Retardant-4 Composite Material as Substrate for Biomedical Applications

Articles in Press

Document Type : Special Issue: Mechanics of Advanced Fiber Reinforced Composite Structures

Authors

1 Department of ECE, Rajagiri School of Engineering & Technology, Kakkanad, Kochi ,INDIA

2 Department of ECE Karunya Institute of Technology & Sciences Coimbatore, Tamil Nadu, India

Abstract

This paper presents the “S” parameter analysis of three -layer stacked microstrip antenna with Defected Ground Structure (DGS) having a “+” shaped slot. The dimension of the antenna is 37x43x4.71 mm3 that provides an enhanced performance ranging from 4.5-12 GHz. An aperture coupled mechanism where a direct connection between feed and the FR-4 (Flame Retardant 4) substrate employing the need for three substrates having dielectric constant (εr = 4.4) and having a thickness of 1.57mm each is utilized in this design. The composite material known as FR4 is structured with its fundamental layer consisting of fiberglass, woven into a thin, fabric-like sheet, providing essential structural support. This innermost layer of fiberglass imparts the necessary stability to FR4. It is then encased and secured by a flame-resistant epoxy resin. The antenna structure incorporates a parasitic patch as the top most layer and an active patch that is placed below the substrate layer both of which incorporate slots for enhanced performance. The ground layer is sandwiched between the active layer and feedline which ensures separation between the two. Such a structure can help in optimizing both the radiating patch and the feedline independently. The performance of the designed antenna is studied for various slots configurations where the S- parameter analysis shows that the antenna provides wideband behavior which makes it suitable for biomedical applications like breast cancer detection. The S parameter analysis done in HFSS software shows a maximum return loss of almost -40dB which is performed for various slot configurations.

Keywords

Main Subjects

Mechanics of Advanced Composite Structures

Articles in Press, Accepted Manuscript
Available Online from 07 September 2024

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