S RADHA
Articles written in Pramana – Journal of Physics
Volume 58 Issue 5-6 May 2002 pp 769-771 Strongly Correlated Electron Systems
Effect of Al substitution on the magnetic properties of Ce(Ga1−
Volume 94 All articles Published: 13 August 2020 Article ID 0122 Research Article
S DEEPA NIVETHIKA B S SREEJA E MANIKANDAN S RADHA M SENTHILPANDIAN
This paper presents the design and development of stretchable and deformable broadband antenna using low-cost silicone rubber-based dielectric substrate. A slot is introduced in the substrate to improve the stretchable behaviour. The dielectric properties of the substrate are measured using suspended ring resonator method. The proposed antenna uses silver elastomeric Lycra fabric as the conductive medium. The resistivity of the conducting Ag fabric is 1 $\Omega$ per sq. mm. The conducting patch and ground plane are attached with the substrate using silicone-based adhesive. The fabricated antenna is tested for its resonant characteristics using the vector network analyser.
Volume 94 All articles Published: 27 August 2020 Article ID 0130 Research Article
A ELAKKIYA S RADHA B S SREEJA E MANIKANDAN
A broadband polarisation-insensitive terahertz (THz) metamaterial absorber (MMA) is presented in this paper. The MMA consists of a simple planar structure as a unit cell and an optically transparent indium tin oxide (ITO) ground plane, both are separated by a 50 $\mu$m dielectric substrate. We designed three combinations of MMA here, which are ITO–polyimide–ITO, ITO–polyethylene terephthalate (PET)–ITO and ITO–silicon dioxide (SiO$_{2}$)–ITO for the same planar structure. By changing the substrate of the structure, the resonant frequency and bandwidth of the absorber structure can be varied. The numerical simulation of the absorber shows that the absorptivity is $>$ 96% for all three substrates. Polyimide, PET and SiO$_{2}$ based absorbers demonstrated the bandwidth of 0.558 THz,0.603 THz and 0.658 THz with covered broadband frequency range of 0.4254–0.9829 THz, 0.457–1.16 THz and 0.511–1.169 THz respectively. ITO–PET–ITO absorber structure produced optical transparency. These bandwidths are compatible and convenient for electronic sources in the terahertz region. This study also provides applications in THz sensing and imaging, communication and detection systems.
Volume 95 All articles Published: 5 October 2021 Article ID 0163 Research article
Terahertz single dual multi-band metamaterial absorber
A ELAKKIYA S RADHA B S SREEJA E MANIKANDAN
In this study, a new multifunctional terahertz (THz) metamaterial absorber (MMA) has been presented which is controlled by the thickness of the substrate used.
The proposed structure consists of copper as the ground plane and polyimide dielectric layer is placed in between the ground panel and the top radiating patch.
The resonant frequency and number of resonating modes of the proposed absorber can be changed by varying the thickness of thesubstrate from 10 to 100
Volume 96 All articles Published: 19 January 2022 Article ID 0029 Research Article
A miniaturised FSS with band-stop response for shielding application in X-band frequency
A novel miniaturised single-layer square loop frequency-selective surface (FSS) designed and optimised for effective shielding in X-band is presented. The proposed FSS structure provides a wider bandwidth response of 4.0 GHz and it covers the X-band frequency (8–12 GHz) with a centre frequency of 10 GHz and attenuation of 39 dB. The proposed design compared the simulation results with equivalent circuit method results. Both achieved the same frequency response and bandwidth but the attenuation level is varied. Due to the symmetric structure,the proposed design achieves polarisation-independent characteristics and provides stable response at normal and oblique incidences for both TE and TM modes up to 60º. Both the measured and simulated results are in good agreement.
Volume 96 All articles Published: 24 March 2022 Article ID 0065 Research Article
Polarisation-insensitive and broadband band-stop metamaterial filter for THz waves
K A KARTHIGEYAN S RADHA E MANIKANDAN
This paper describes the design and analysis of the tri-band metamaterial band-stop filter for terahertz applications. The design consists of a structured gold metallic patch over a flexible polyimide substrate.
The thicknesses of the substrate and the metallic patch are 125 and 1
Volume 97, 2023
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