Thennarasan Sabapathy
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Preferred name
Thennarasan Sabapathy
Official Name
Thennarasan, Sabapathy
Alternative Name
Sabapathy, Thennarasan
Sabapathy, Thenna
Sabapathy, T.
Sapabathy, T.
Main Affiliation
Scopus Author ID
35424377200
Researcher ID
AAA-9706-2019

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Augmented Reality and Virtual Reality: Transforming the Future of Psychological and Medical Sciences

2023-01-01 , Singh G. , Kataria A. , Jangra S. , Dutta R. , Mantri A. , Sandhu J.K. , Thennarasan Sabapathy

94With the advent of immersive technologies, it is possible to create unique experiences by combining the physical world with digital reality. Augmented reality (AR), virtual reality (VR), and mixed reality (MR) are examples of digital technologies and affordances that replicate reality in various ways. Immersive technologies in medical science, psychology, and clinical research can help doctors, surgeons, and patients by providing extended reality views. Immersive technologies such as VR and AR play a significant role in developing a stimulating environment. A stimulating environment can help doctors perform surgeries, children with autism disorder develop their communication skills, and psychologists provide simulated situations to patients suffering from different neurological disorders. AR and VR can take patients into similar situations when they face panic attacks, anxiety, and phobia in a controlled manner, which further helps them overcome the situations in real life. In this paper, the possibilities of AR and VR interventions for providing unique solutions in medical science, clinical research, psychology, and neurological disorders are discussed. The most recent studies were selected based on users’ medical and disability needs, and an overview of past research was presented in terms of current work, benefits, obstacles, and opportunities for future work.

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Right Hand Circularly Polarized (RHCP) Dual Band Flexible GNSS Antenna

2023-01-01 , Sheikh R.A. , Al-Hadi A.A. , Thennarasan Sabapathy , Mirza H. , Soh Ping Jack

A right-hand circularly polarized (RHCP) flexible dual-band Global Navigation Satellite System (GNSS) antenna operating at L1 (1575 MHz) and L2 (1227MHz) and having dimensions (83×89×7.25) mm3 is presented. Two circular radiators with two slotted rings each enable the antenna to operate at L1 and L2 bands.

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ENG and NZRI Characteristics of Decagonal-Shaped Metamaterial for Wearable Applications

2020-08-01 , Hossain K. , Thennarasan Sabapathy , Muzammil Jusoh , Soh Ping Jack , Fazilah A.F.M. , Halim A.A.A. , Raghava N.S. , Podilchak S.K. , Schreurs D. , Abbasi Q.H.

A decagonal-shaped split ring resonator metamaterial based on a wearable or textile-based material is presented in this work. Analysis and comparison of various structure sizes are compared considering a compact 6\times 6\ \mathrm{m}\mathrm{m}{2} metamaterial unit cell, in particular, where robust transmission-reflection (RTR) and Nicolson-Ross-Weir (NRW) methods have been performed to extract the effective metamaterial parameters. An investigation based on the RTR method indicated an average bandwidth of 1.39 GHz with a near-zero refractive index (NZRI) and a 2.35 GHz bandwidth when considering epsilon negative (ENG) characteristics. On the other hand, for the NRW method, approximately 0.95 GHz of NZRI bandwidth and 2.46 GHz of ENG bandwidth have been observed, respectively. These results are also within the ultra-wideband (UWB) frequency range, suggesting that the proposed unit cell structure is suitable for textile UWB antennas, biomedical sensors, related wearable systems, and other wireless body area network communication systems.

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High Gain Beam-Steerable Reconfigurable Antenna using Combined Pixel and Parasitic Arrays

2021-01-12 , Subramaniam D. , Muzammil Jusoh , Thennarasan Sabapathy , Soh Ping Jack , Mohamed Nasrun Osman , Alaydrus M. , Hodgkinson C.J. , Podilchak S.K. , Schreurs D.

This paper presents a pattern reconfigurable antenna for wide beam steering applications at the 9.5 GHz band. The beam steering performance is based on the combination of a Yagi-Uda antenna and its complimenting top pixel structure. The integration of this driven antenna element with its parasitic elements is capable of providing steering of up to ±40° (at -40°, 0° and +40°). However, with the added combination of a reconfigurable pixel array on top, the steering angle of the antenna can then be improved to -45°, 0° and +45°, and with measured gains of between 6.5 and 7.5 dBi. A factor critical in enabling the added beam steering capability is the control of the mutual coupling within the bottom antenna array and the top pixel layer. Results indicate that the proposed antenna could be useful for X-Band radar and other applications that require beam steering.

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Design of Compact UHF-RFID Tag Antenna with Meander Line Technique

2020-03-20 , Fazilah A.F.M. , Muzammil Jusoh , Zakaria A. , Thennarasan Sabapathy , Ibrahim M.F. , Osman M.N. , Yaasin M.N. , Malhotra S. , Rahim H.A.

In this paper, a compact UHF RFID tag antenna that can operate at Malaysia UHF RFID frequency (860 MHz - 960MHz) is proposed. The antenna with a common geometry structure without any shorting pin consists of 90degree angled line (meander line) and double T-match structure. The proposed antenna has been designed and simulated using CST Simulation software. The proposed tag antenna design shows a good performance in terms of size, gain and impedance with a dimension of 36 mm 25 mm 1.6 mm. The simulated gain of antenna obtained is -0.135 dB at 910 MHz with 19 MHz bandwidth.

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Compact ultra-wideband monopole antenna loaded with metamaterial

2020-02-01 , Al-bawri S.S. , Goh H.H. , Islam M.S. , Wong H.Y. , Jamlos M.F. , Narbudowicz A. , Muzammil Jusoh , Thennarasan Sabapathy , Khan, Rizwan D. , Islam M.T.

A printed compact monopole antenna based on a single negative (SNG) metamaterial is proposed for ultra-wideband (UWB) applications. A low-profile, key-shaped structure forms the radiating monopole and is loaded with metamaterial unit cells with negative permittivity and more than 1.5 GHz bandwidth of near-zero refractive index (NZRI) property. The antenna offers a wide bandwidth from 3.08 to 14.1 GHz and an average gain of 4.54 dBi, with a peak gain of 6.12 dBi; this is in contrast to the poor performance when metamaterial is not used. Moreover, the maximum obtained radiation efficiency is 97%. A reasonable agreement between simulation and experiments is realized, demonstrating that the proposed antenna can operate over a wide bandwidth with symmetric split-ring resonator (SSRR) metamaterial structures and compact size of 14.5 × 22 mm2 (0.148 λ0 × 0.226 λ0) with respect to the lowest operating frequency.

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Multi-Mode Yagi Uda Patch Array Antenna With Non-Linear Inter-Parasitic Element Spacing

2023-01-01 , Isa S.R. , Muzammil Jusoh , Thennarasan Sabapathy , Kamarudin M.R. , Mohamed Nasrun Osman , Alomainy A.

A low-profile and broad steerable patch array antenna is presented. The improvement of the multi-directional functions from the broadside is very limited for the patch array antenna. In this work, the number of directional beams is enhanced by 40% using a novel approach, inter-parasitic element expansion technique and adopted only four PIN diode switches. Results in simulation and measurement have verified that the patch parasitic array antenna is capable -of generating seven beam patterns directed towards -52°, -30°, -10°, 0°, +10°, +30°, and +52° at the xz-plane. Applying the inter-parasitic element spacing's optimization and minimizing the switching circuitry using four RF PIN diodes on the parasitic elements have contributed to the gain achievement of more than 7 dBi.

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Negative Index Metamaterial-Based Frequency-Reconfigurable Textile CPW Antenna for Microwave Imaging of Breast Cancer

2022-02-01 , Hossain K. , Thennarasan Sabapathy , Muzammil Jusoh , Lee S.H. , Rahman K.S.A. , Kamarudin M.R.

In this paper, we report the design and development of a metamaterial (MTM)-based directional coplanar waveguide (CPW)-fed reconfigurable textile antenna using radiofrequency (RF) varactor diodes for microwave breast imaging. Both simulation and measurement results of the proposed MTM-based CPW-fed reconfigurable textile antenna revealed a continuous frequency re-configuration to a distinct frequency band between 2.42 GHz and 3.2 GHz with a frequency ratio of 2.33:1, and with a static bandwidth at 4–15 GHz. The results also indicated that directional radiation pattern could be produced at the frequency reconfigurable region and the antenna had a peak gain of 7.56 dBi with an average efficiency of more than 67%. The MTM-based reconfigurable antenna was also tested under the deformed condition and analysed in the vicinity of the breast phantom. This microwave imaging system was used to perform simulation and measurement experiments on a custom-fabricated realistic breast phantom with heterogeneous tissue composition with image reconstruction using delay-and-sum (DAS) and delay-multiply-and-sum (DMAS) algorithms. Given that the MWI system was capable of detecting a cancer as small as 10 mm in the breast phan-tom, we propose that this technique may be used clinically for the detection of breast cancer.

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Reconfigurable pattern patch antenna for mid-band 5G: A review

2022-01-01 , Isa S.R. , Muzammil Jusoh , Thennarasan Sabapathy , Nebhen J. , Kamarudin M.R. , Mohamed Nasrun Osman , Abbasi Q.H. , Hasliza A Rahim @ Samsuddin , Mohd Najib Mohd Yasin , Soh Ping Jack

New requirements in communication technologies make it imperative to rehash conventional features such as reconfigurable antennas to adapt with the future adaptability advancements. This paper presents a comprehensive review of reconfigurable antennas, specifically in terms of radiation patterns for adaptation in the upcoming Fifth Generation (5G) New Radio frequency bands. They represent the key of antenna technology for materializing a high rate transmission, increased spectral and energy efficiency, reduced interference, and improved the beam steering and beam shaping, thereby land a great promise for planar antennas to boost the mid-band 5G. This review begins with an overview of the underlying principals in reconfiguring radiation patterns, followed by the presentations of the implemented innovative antenna topologies to suit particular advanced features. The various adaptation techniques of radiation pattern reconfigurable planar antennas and the understanding of its antenna design approaches has been investigated for its radiation pattern enhancement. A variety of design configurations have also been critically studied for their compatibilities to be operated in the mid-band communication systems. The review provides new insights on pattern reconfigurable antenna where such antennas are categorized as beam steering antenna and beam shaping antennas where the operation modes and purposes are clearly investigated. The review also revealed that for mid-band 5G communication, the commonly used electronic switching such as PIN diodes have sufficient isolation loss to provide the required beam performance.

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Broadband Sub-6GHz Slot-based MIMO Antenna for 5G NR Bands Mobile Applications

2021-07-26 , Al-Bawri S.S. , Islam M.T. , Singh M.J. , Alyan E. , Muzammil Jusoh , Thennarasan Sabapathy , Padmanathan S. , Hossain K.

A slot-based broadband single and MIMO antennas for 5G New Radio (5G NR) mobile applications are presented in this paper. The proposed MIMO antenna is investigated by loading two antennas into a low-cost material with the partial ground for sub-6GHz. Each antenna element is consisted of a hexagonal-shaped slot and is composed of a 50Ω microstrip feed line. The WLAN 5-GHz band and 5G NR Bands n77/n78/n79 are covered with good impedance matching. Besides, the mutual coupling between the adjacent elements is less than 15-dB whereas the desired antenna elements gains are 3.19 dBi and 3.09 dBi at 3.5 GHz 4.2 GHz respectively.

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