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All Journal International Journal of Information System and Innovative Technology
Sabapathy, Thennarasan
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Computer Science & IT

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Reconfigurable Dual Band Antenna using Varactor Diode Mohammed Ahmedalsayaghi, Ali; Sabapathy, Thennarasan; Nasrun Osman, Mohamed; Rooban Gunasekaran, Shanmuka; Kumari Gollu, Sri Man; Poripireddy, Divya Gayathri
International Journal of Information System and Innovative Technology Vol. 4 No. 2 (2025): December
Publisher : Geviva Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.63322/1epsgh59

Abstract

This paper presents a dual-band frequency reconfigurable microstrip antenna integrated with an Electromagnetic Band Gap (EBG) structure for modern wireless communication applications. The proposed antenna operates at two key frequency bands of 1.8 GHz and 2.4 GHz and is fabricated on a Rogers 4003C substrate to achieve low dielectric loss and stable radiation performance. Frequency reconfigurability is achieved by embedding varactor diodes across strategically etched slots on the radiating patch, allowing continuous tuning through DC bias voltage control without altering the physical structure of the antenna. The EBG structure is employed to suppress surface wave propagation and enhance antenna gain and radiation stability. Simulation and experimental results demonstrate effective frequency tuning from 1.68–1.88 GHz and 2.38–2.81 GHz with stable impedance matching and directional radiation patterns. The proposed antenna is suitable for compact and reconfigurable wireless systems such as IoT and 5G applications.
Reflection Phase Characterization of Metasurfaces Enabling Reflection and Transmission in Wireless Systems Maniam, Rajkumar; Sabapathy, Thennarasan; Nasrun Osman, Mohamed; Jusoh, Muzammil; PICHANDI, SIDDARTH
International Journal of Information System and Innovative Technology Vol. 4 No. 2 (2025): December
Publisher : Geviva Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.63322/2wzh1z83

Abstract

This paper presents the design and analysis of metasurfaces for surface-based wireless communication systems. Metasurfaces are widely used as reflecting or transmitting surfaces in wireless communications. The reflection phase characteristic of a metasurface plays an important role in determining its operating behavior, namely whether it functions as a reflector or a transmitter. In this work, a comprehensive analysis is conducted to obtain two distinct reflection phase characteristics of metasurface unit cells. The unit cells are analyzed at an operating frequency of 3.5 GHz. It is observed that the unit cell exhibits a reflection phase close to 0° when designed using two rectangular rings, while a reflection phase close to 180° is achieved when the unit cell is modeled as a square ring. In both designs, the unit-cell substrate size is fixed at 16.25 × 16.25 mm². The presented reflection phase characterization provides a clear design guideline for selecting metasurface unit-cell geometries to support reflection and transmission functionalities in future surface-based wireless communication systems.
Co-Authors Jusoh, Muzammil Kumari Gollu, Sri Man Maniam, Rajkumar Mohammed Ahmedalsayaghi, Ali Nasrun Osman, Mohamed PICHANDI, SIDDARTH Poripireddy, Divya Gayathri Rooban Gunasekaran, Shanmuka