Thennarasan Sabapathy
Thumbnail Image
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

Research Output

Filters

5
5
Reset filters

Settings
Now showing 1 - 5 of 5
  • Publication
    Investigation on the Effect of Deflected Ground Structure in Multi-Direction Steerable Antenna for WSN
    ( 2020-03-20)
    Zainudin N.A.F.M.
    ;
    Osman M.N.
    ;
    Thennarasan Sabapathy
    ;
    Muzammil Jusoh
    In this paper, a multi-direction steerable radiation pattern antenna is designed and investigated, which operates at 2.45 GHz frequency. The radiation pattern reconfigurable is achieved by locating four parasitic elements surrounding the driving element at the centre. The artificial switches, are currently used to replace the ideal diode for proof of the concept, are inserted at the specific position on the parasitic element. By controlling the state ON/OFF of the switches, the parasitic is grounded via shorting pin, thus realizing the beam steering to be directed into four direction angles; right, left, upwards and downwards. In this research, an investigation on the effect of deflected ground plane on the steering angles has been carried out. With minimum numbers of switches deployed, the proposed antenna is a potential candidate to serve as a transmitting element in WSN applications.
  • Publication
    A Compact Wideband CSRR near Zero Refractive Index and Epsilon Negative Metamaterial for Wearable Microwave Applications
    ( 2021-07-26)
    Hossain K.
    ;
    Thennarasan Sabapathy
    ;
    Muzammil Jusoh
    ;
    Soh Ping Jack
    ;
    Osman M.N.
    ;
    Al-Bawri S.S.
    A complementary split-ring resonator (CSRR) decagonal shaped textile-based single-negative metamaterial (MTM), considering a frequency range from 1 to 15 GHz, is presented in this paper. Seven different unit cell arrays (i.e., 1 1, 1 2, 1 3, 2 1, 2 2, 1 3 and 3 3) are analysed to evaluate the effects of the unit-cell arrays on the resonance frequencies of the MTM. The designed unit cell arrays exhibit average negative permittivity bandwidth of 12.87 GHz (from 1 to 12.87 GHz) and an average near-zero-refractive-index (NZRI) bandwidth of 11.98 GHz (from 1.015 to 12.995 GHz). Simultaneous negative permittivity and NZRI results at L, S, C, X and Ku frequency bands indicate the proposed MTM is suitable for various wearable applications in these frequency regimes.
  • Publication
    Beam Steering Monopole Antenna for Low Power Wireless Communication in WSN
    ( 2020-03-20)
    Mahdir N.A.F.
    ;
    Osman M.N.
    ;
    Thennarasan Sabapathy
    ;
    Muzammil Jusoh
    ;
    Zainudin N.A.F.M.
    Antenna for wireless sensor networks (WSN) application need to satisfy a number of additional properties like antenna efficiency. Since there are many WSN nodes, the use of low cost and high efficient antenna is highly important. Therefore, in this paper, a beam steering antenna resonate at 2.4 GHz with monopole element by using parasitic array technique is proposed. The parasitic array element is introduced to achieve a better gain and acts as a reflector to steer the beam to the desired degree of angles. The structure of the proposed design consists of monopole antenna as the radiating element, and to parasitic patches with the same dimension of monopole are placed next to the radiating patch. Two switches (PIN diode) are used and embedded at the back of the structure. By activating and deactivating of the switches (ON or OFF), the parasitic is either grounded or disconnected from ground. Consequently, depending on the switches configuration, the beam pattern can be steered two direction angles which 25 left or right. The simulated and measured results are presented to demonstrate the performance of the proposed antenna.
  • Publication
    A Patternless Piezoelectric Energy Harvester for Ultra Low Frequency Applications
    ( 2020-01-01)
    Awal M.R.
    ;
    Jusoh M.
    ;
    Thennarasan Sabapathy
    ;
    R Badlishah Ahmad
    ;
    Kamarudin M.R.
    ;
    Osman M.N.
    ;
    Ahmad M.F.
    ;
    Rahman S.A.
    ;
    Dagang A.N.
    This paper presents a pattern less piezoelectric harvester for ultra low power energy applications. Usually patterned cantilevers are used as vibration energy harvester which results additional fabrication process. Hence, to reduce the process, a four layer cantilever configuration is used to design the harvester with Aluminum, Silicon and Zinc Oxide. The device dimension is settled to 12×10×≈0.5009 mm3 with ≈300 nm deposition thickness for each layer. The modeling and fabrication processes are demonstrated in detail. The induced voltage by the cantilever is obtained through the analytical and practical measurements. From the measurements, it is found that, the maximum induced voltage is 91.2 mV from practical measurement with voltage density of 1.517 mV/mm3. It is evident from the results that, this pattern less model can be useful for next generation vibration energy harvester with simpler technology.
  • Publication
    Frequency Tunability Inspired Flexible Antenna to Mitigate Deformation Effect
    ( 2022-01-01)
    Thambiraja V.
    ;
    Thennarasan Sabapathy
    ;
    Osman M.N.
    ;
    Jais M.I.
    ;
    Muzammil Jusoh
    ;
    Kavitha K.
    This paper presents a new approach to mitigating resonant frequency shift for deformed flexible antennas. Deformation or bending adversely affects the antenna resonant frequency and this magnitude of the frequency shift could depend on key factors such as the material used and the antenna structure. The frequency reconfiguration concept was used with two proof of concept switches to investigate the effectiveness of the proposed method to shift back the frequency to its original resonant. The antenna was first designed to operate at 2.48 GHz frequency. Utilizing the frequency reconfiguration, the antenna can be re-tuned to 2.48 GHz even under bending conditions.