Thennarasan Sabapathy
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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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  • Publication
    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.
  • Publication
    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.
  • Publication
    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.
  • Publication
    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.
  • Publication
    Design of a Compact Reconfigurable Antenna with Hybrid Polarization and Frequency Control for Geofencing Application
    ( 2023-01-01)
    Kandasamy U.D.
    ;
    Thennarasan Sabapathy
    ;
    Muzammil Jusoh
    ;
    Mohamed Nasrun Osman
    A frequency reconfigurable antenna for location monitoring is proposed. The antenna developed can be reconfigured at two frequencies with suitable polarization and radiation pattern which designed for geofencing application, thus it either can operate at 1.575 GHz band or 2.45 GHz band. The expected outcome of this work is that when the user is within the geo-fence area it will use WIFI, while when the user exits the geo-fence area, GPS application will be selected. With the use of two switches, the antenna can operate either at band from 2.335 GHz to 2.593 GHz for S11< -10 dB and from 1.546 GHz to 1.588 GHz at S11 <-6 dB. The axial ratio results of less than 3 dB is achieved at 1.575 GHz with a bandwidth of 20 MHz.
  • Publication
    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.
  • Publication
    A Fuzzy-Based Angle-of-Arrival Estimation System (AES) Using Radiation Pattern Reconfigurable (RPR) Antenna and Modified Gaussian Membership Function
    ( 2019-01-01)
    Jais M.I.
    ;
    Thennarasan Sabapathy
    ;
    Muzammil Jusoh
    ;
    R Badlishah Ahmad
    ;
    Jamaluddin M.H.
    ;
    Kamarudin M.R.
    ;
    Ehkan P.
    ;
    Murukesan Loganathan L.
    ;
    Soh P.J.
    Angle-of-arrival (AOA) estimation is an important factor in various wireless sensing applications, especially localization systems. This paper proposes a new type of AOA estimation sensor node, known as AOA-estimation system (AES) where the received signal strength indication (RSSI) from multiple radiation pattern reconfigurable (RPR) antennas are used to calculate the AOA. In the proposed framework, three sets of RPR antennas have been used to provide a coverage of 15 regions of radiation patterns at different angles. The salient feature of this RPR-based AOA estimation is the use of Fuzzy Inferences System (FIS) to further enhance the number of estimation points. The introduction of a modified FIS membership function (MF) based on Gaussian function resulted in an improved 85% FIS aggregation percentage between the fuzzy input and output. This later resulted in a low AOA error (of less than 5%) and root-mean-square error (of less than 8°).
  • Publication
    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.
  • Publication
    Switchable Beam Antenna with Five Planar Element using PIN Diode in Elevation Plane
    ( 2020-09-28)
    Adan F.H.
    ;
    Muzammil Jusoh
    ;
    Thennarasan Sabapathy
    ;
    Mohamed Nasrun Osman
    ;
    Alaydrus M.
    ;
    Awal M.R.
    ;
    Hasliza A Rahim @ Samsuddin
    ;
    Mohd Najib Mohd Yasin
    ;
    Alomainy A.
    ;
    Kamarudin M.R.
    ;
    Majid H.A.
    This work focuses on the switchable beam parasitic patch antenna for the point to point communication system. This concept gives more flexibility due to their ability to modify the radiation and providing multiple functionalities. This work focuses on two points directly to minimize the number of PIN Diode and to maximize its reconfiguration capabilities. First, the concept of two parasitic element is addressed. The mutual coupling effect between both driven and parasitic has manage to steer the beam to-28{\mathrm{o}}, \ 0{\mathrm{o}} and +28o different angles in a single layer. The design consists of four parasitic elements with full ground and four pin diode switch HPND-4005, five different directions have been reached which are-450,-30{\mathrm{o}}, \ 0{\mathrm{o}}+30{\mathrm{o}} and +450. The parasitic patch antenna has achieved high gain of 8. 92dBi at 5.8 GHz with the beam ability to steer unti145o for both side of the parasitic element.
  • Publication
    A Three-Year Improvement Assessment of Project-Based Learning for an Antennas and Propagation Course [Education Corner]
    ( 2020-12-01)
    Thennarasan Sabapathy
    ;
    Soh Ping Jack
    ;
    Muzammil Jusoh
    Antennas and propagation constitute one of the compulsory courses for students in the communication engineering program at many universities. At Universiti Malaysia Perlis (Uni-MAP), a new project-based learning (PBL) approach has been implemented in the teaching and lab instruction of this class. Besides imparting the latest antenna technology in the form of textile antennas to the students, this hands-on approach has proved to increase students' interest and understanding of the main elements of the curriculum. PBL is applied during 14 weeks in the form of laboratory sessions. Through the first four weeks, basic antenna laboratory sessions are conducted to introduce students to the principles of antennas and their design, fabrication, and measurement procedures. Moreover, students are then required to fabricate their own unique antennas using textiles and manual tools available in the lab, a process that consumes less time compared to making antennas from normal printed circuit boards. An analysis of how well the course outcomes (COs) were achieved and the final results of the students was performed for three years. The conclusions indicate that, using PBL, student performance increased, with an average increment of 5% in the CO attainment.