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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A multilayered acoustic signal generator for low power energy harvesting

2017-10-10 , Awal M.R. , Muzammil Jusoh , Hasliza A Rahim @ Samsuddin , Thennarasan Sabapathy , Mohamed Nasrun Osman , Mohd Ilman Jais , Kamarudin M.R.

This paper presents the design and analysis of a multilayer cantilever to harvest vibration energy by generating acoustic signal. To do so, a five layer configuration is used to design the cantilever. Lead Zirconate Titanate (PZT-8), Stainless Steel 405 Annealed, Aluminum and Zinc Oxide are used to develop the layers. Water is used as the medium to analyze the sound propagation pattern. Sound Pressure Level, displacements and electric potential of the cantilever are analyzed along with other parameters. From the results, it is evident that, the proposed cantilever can propagate sound within a range of 78.7 dB to 73.4 dB in a 50 mm spherical distance.

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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°).

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Beam Steering Investigation on Multiple Antenna System using Radiation Pattern Reconfigurable Array

2021-01-01 , Bharath J. , Thennarasan Sabapathy , Muzammil Jusoh , Hasliza A Rahim @ Samsuddin , Kamarudin M.R. , Soh P.J.

In this research, a radiation pattern reconfigurable (RPR) based multiple antenna was designed using a compact combination of a driven element and parasitic elements that operates at 3.5 GHz. The proposed antenna has the ability to change the radiation behavior to serve the user with better performance. The radiation characteristic of the antenna, especially the tilt angle could be reconfigured with the use of RF switches. The multiple antenna was designed on 94.4 mm x 110 mm Rogers substrate. First, an RPR antenna that uses parasitic patch array antenna was designed as a single element. Then this RPR was deployed as 2 x 1 RPR MIMO antenna using two types of configurations. Finally, the analysis showed that the multiple antenna arrangement using configuration II provides better results in terms of steering angle and gain.

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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.

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Analysis reconfigurable frequency textile antenna in bending condition

2017-01-01 , Shakhirul Mat Salleh , Muzammil Jusoh , Abdul Hafiizh Ismail , Hasliza A Rahim @ Samsuddin , Kamarudin M.R. , Thennarasan Sabapathy , Herwansyah Lago

In this paper, the analysis of reconfigurable frequency textile antenna in bending conditions is presented. The antenna consists of a truncated rectangular patch and slotted ground plane made by ShieldIt Super. Felt fabric is used as an antenna substrate. The proposed antenna is capable to reconfigure at seven different states frequencies by using three PIN diodes. The Circular Polarization (CP) is achieved at the GPS operating frequency. Meanwhile, the proposed antenna operates as a Linear Polarization (LP) at high operating frequencies. The performances of antenna in bending conditions is analyze since the textile antenna usually attached on the body will easily bend due to the human body structures. Details of the simulation results for antenna in bending condition are discussed.

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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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Switchable Beam Antenna with Five Planar Element using PIN Diode in Elevation Plane

2020-09-28 , Adan, Fuad Hassan , Muzammil Jusoh , Alaydrus M. , Mohamed Nasrun Osman , Thennarasan Sabapathy , Awal M.R. , Alomainy A. , Kamarudin M.R. , Mohd Najib Mohd Yasin , Hasliza A Rahim @ Samsuddin , 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.

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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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Analysis of Aperture Coupled Circular Patch Antenna for Mid-Band 5G

2021-01-01 , Isa S.R. , Muzammil Jusoh , Thennarasan Sabapathy , Kamarudin M.R. , Mohamed Nasrun Osman , Bakar H.A. , Tariqul Islam M. , Alaydrus M.

This paper presents the design analysis of a compact circular patch antenna. The proposed antennas are excited through an aperture coupled feeding technique. The design of the antenna has been implemented using CST software. The analysis is done based on the antenna simulation output parameter. The reflection coefficient, gain, and radiation pattern is discussed in this work. At resonance frequency of 3.5 GHz, the circular patch aperture coupled fed antenna is managed to get the high gain, good bandwidth, and minimum reflection coefficient (S11). The proposed antenna has high gain of 8.01 dBi and a sufficient bandwidth requirement for mid-band 5G applications.

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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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