R Badlishah Ahmad
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Preferred name
R Badlishah Ahmad
Official Name
R Badlishah, Ahmad
Alternative Name
Ahmad, R. Badlishah
Ahmad, B.
Badlishah Ahmad, R.
Ahmad, Rashidi
Ahmad, Badlisha
Ahmed, R. Badlishah
Ahmad, R. B.
Badlishah, R.
Ahmad, R. Badli
Ahmed, Rbadlishah
Main Affiliation
Scopus Author ID
57194844651
Researcher ID
U-3211-2019

Research Output

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Frequency Reconfigurable DRA using RF Switch Loaded Feedline for 5G NR Band n48, n77 and n78

2022-01-01 , Gunasekaran S.R. , Thennarasan Sabapathy , Muzammil Jusoh , R Badlishah Ahmad , Nur Farhan Kahar , Muhamad W.Z.A.W.

This paper presents a frequency reconfigurable DRA. The size of the antenna is approximately 50 mm by 40 mm, thus it can be considered a compact design. This antenna was designed using Rogers RO4003 substrate and the DRA material used was Eccostock HIK. To achieve frequency reconfiguration, the length of the antenna feedline was reconfigured by the means of RF switches. The proposed design consists of four configurations and all those conditions achieved reflection coefficient of less than -10 dB. The antenna also produced consistent gain for all configurations with average gain of 5 dBi. The switched frequencies from the proposed antenna can cover 5G New Radio Bands n48, n77 and n78.

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Gain Enhancement of Rectangular Dielectric Resonator Antenna Using Air Gap

2023-10-06 , Shanmuka Rooban Gunasekaran , Thennarasan Sabapathy , Muzammil Jusoh , R Badlishah Ahmad , Mohamed Nasrun Osman , Saidatul Norlyana Azemi , Nur Farhan Kahar , Wan Zuki Azman Wan Muhamad , Saravanan Nathan Lurudusamy

This paper presents a gain enhanced rectangular dielectric resonator antenna (DRA) using air gap. The air gap placed under the dielectric resonator antenna and above the ground plane. A gain of 6.605 dBi obtained from the DRA with air gap while gain of 5.956 dBi is achieved by DRA without air gap. The size of the antenna is approximately 50 mm by 40 mm, thus it can be considered a compact design. This antenna designed using Rogers RO4003 substrate and the DRA material is Eccostock HIK. All the design and simulation results are conducted using CST Studio Suite 2019 software. Based on the result, it shows that the antenna operates with reflection coefficient of less than -10 dB at the desired operating frequency range, centered at 3.5 GHz. The inclusion of air gap proved that it can enhance the gain value of the DRA.

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A Frequency-Reconfigurable Microstrip Antenna with Constant Dipole-Like Radiation Patterns Using Single Bias, Triple Varactor Tuning with Reduced Complexity

2022-03-01 , Hossain K. , Thennarasan Sabapathy , Muzammil Jusoh , Soh Ping Jack , R Badlishah Ahmad , Jais M.I. , Mohamed Nasrun Osman , Mohd Najib Mohd Yasin , Hasliza A Rahim @ Samsuddin , Saluja N. , Abbasi Q.H.

This work proposes a novel frequency-reconfigurable circular patch antenna incorporated with a rectangular slot and a narrow slot capable of producing constant dipole-like radiation patterns. The antenna compactness is achieved with the integration of the rectangular slot defected ground structure (DGS) on the ground. The proposed antenna is able to perform continuous frequency tuning between 1.91 and 2.77 GHz with a frequency ratio of 1.5:1, in addition to stable dipole-like radiation patterns. The resonant frequency of the antenna is controlled by tuning a simple DC biasing network that consists of three RF varactor diodes located on the narrow slot DGS. Implementing the DC biasing network at the narrow slot DGS while maintaining the large slot DGS helps the antenna miniaturization and maintains the constant dipole-like radiation pattern over all frequency tuning range. The results are validated via simulations and experimental validations in terms of reflection coefficients and the radiation patterns. Measurements indicated that an impedance bandwidth of 85 MHz is featured for each tuned frequency band, with dipole-like patterns and an average gain of 1.57 dBi.

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Mobile Green E-Waste Management Systems using IoT for Smart Campus

2021-07-26 , Khairul Najmy Abdul Rani , Hasliza A Rahim @ Samsuddin , Ong B.T. , Muzammil Jusoh , Mohd Najib Mohd Yasin , Thennarasan Sabapathy , Wan Azani Wan Mustafa , Mohd Aminudin Jamlos , R Badlishah Ahmad , Hammood D.A.

This paper presents the design and development of mobile "green"electronic waste (e-waste) management systems using Internet of Things (IoT) for smart campus. The system uses Raspberry Pi 3 Model B v1.2 microcontroller for monitoring e-waste object detection, e-waste count, and bin percentage level, respectively. TensorFlow Lite application programming interface (API) is used to run Single Shot Multibox Detector (SSD)Lite-MobileNet-v2 model trained on Microsoft Common Objects in Context (MSCOCO) dataset for e-waste object detection in image. All the monitoring data are stored and retrieved in ThingSpeak cloud platform using Hypertext Transfer Protocol (HTTP) and Message Queuing Telemetry Transport (MQTT) protocol over the Internet and displayed via interactive Android-based mobile user interface (UI). Furthermore, automatic e-mail notification will be sent to waste collector for bin collection whenever e-waste bin percentage level is greater than predetermined threshold value of 80% full.

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Smart Gateless System using RFID Technology in Universiti Malaysia Perlis

2021-06-11 , Ainur Fasihah Mohd Fazilah , Muzammil Jusoh , Ammar Zakaria , Thennarasan Sabapathy , Mohd Firdaus Ibrahim , Hasliza A Rahim @ Samsuddin , Muhammad Mokhzaini Azizan , Mohd Zakimi Zakaria , Nashrul Fazli Mohd Nasir , Albreem M.A.M. , R Badlishah Ahmad

This paper describes a smart monitoring gate-less system by using RFID technologies that had been implemented in Universiti Malaysia Perlis. The objective of this system is to ease the security to monitoring the cars-in and cars-out from the main gate manually. The security can check and manage the staff by system management in PC. This smart monitoring gate-less system consists of RFID tag antenna that be attached at sticker's staff, RFID reader and software management application. For the software management application, this project used LabView as a simulation tool for the data acquisition. The data which contains of name, staff number, number plate, car model and color will be stored in cloud-based storage. All the information data can be accessed from any location because the security management can access it through mobile. This project will present how efficient the vehicle control application on campus which enable the security guard to check a car sticker either legal or illegal in a shortest way.

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