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Mohamad Isa, Muammar
Universiti Malaysia Perlis
Electrical & Electronics Engineering

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Self-switching Diodes as RF Rectifiers: Evaluation Methods and Current Progress Farhani Zakaria, Nor; Rizal Kasjoo, Shahrir; Mohamad Isa, Muammar; Zailan, Zarimawaty; Khairuddin Md Arshad, Mohd; Taking, Sanna
Bulletin of Electrical Engineering and Informatics Vol 8, No 2: June 2019
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/eei.v8i2.1413

Abstract

In the advancement of the Internet of Things (IoT) applications, widespread uses and applications of devices require higher frequency connectivity to be explored and exploited. Furthermore, the size, weight, power and cost demands for the IoT ecosystems also creates a new paradigm for the hardware where improved power efficiency and efficient wireless transmission needed to be investigated and made feasible. As such, functional microwave detectors to detect and rectify the signals transmitted in higher frequency regions are crucial. This paper reviewed the practicability of self switching diodes as Radio Frequency (RF) rectifiers. The existing methods used in the evaluation of the rectification performance and cut-off frequency are reviewed, and current achievements are then concluded. The works reviewed in this paper highlights the functionality of SSD as a RF rectifier with design simplicity, which may offer cheaper alternatives in current high frequency rectifying devices for application in low-power devices.
Bandwidth and Gain Enhancement of a Circular Microstrip Antenna using a DNG Split Ring Resonator Radome Rasheed, Ojo; Faizal Jamlos, Mohd; Jack Soh, Ping; Aminudin Jamlos, Mohd; Mohamad Isa, Muammar
Bulletin of Electrical Engineering and Informatics Vol 8, No 2: June 2019
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/eei.v8i2.1429

Abstract

This paper present the design of a circular patch microstrip antenna with enhancement in terms of bandwidth and gain using a dielectric double negative (DNG) split ring metamaterial radome. This radome is positioned on top of the CP antenna operating from 5.2 GHz to 6.4 GHz. The metamaterial radome comprises of two alternate split rings of negative permittivity, permeability and refractive index. The circular microstrip antenna bandwidth of 430 MHz has been realized by the presence of DNG metamaterial radome compared to 220 MHz without the radome. The gain has been increased as well from 1.84 dBi to 3.87 dBi.
Low Insertion Loss of Surface Mount Device Low Pass Filter at 700 MHz Anuar Khairi, Khairil; Faizal Jamlos, Mohd; Padmanathan, Surentiran; Aminudin Jamlos, Mohd; Mohamad Isa, Muammar
Bulletin of Electrical Engineering and Informatics Vol 8, No 2: June 2019
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/eei.v8i2.1386

Abstract

The paper involved with the design, simulation and fabrication of 6th order elliptical-based Surface Mount Device (SMD) LPF with cutoff frequency at 700 MHz. Fabricated LPF is consisted of four PCB layers which components of SMD are soldered on the top layer. Another three layers is for grounding and shielding, power supply and grounding void. The four layers is crucial to avoid interference between components.     The research has find out that the momentum simulation is definitely required to improve the signals response compared to a normal simulation by ADS software. The comparison between momentum simulated versus measured and normal simulated versus measured is 0.2 dB and 29 dB correspondingly. Such huge difference leads to conclusion that momentum simulation is saving time without having much struggles and efforts to get optimum readings. The Proposed SMD LPF has a very low insertion loss of 0.965dB with a transition region of 195 MHz which is good steepness to avoid any image frequency.
Co-Authors Aminudin Jamlos, Mohd Anuar Khairi, Khairil Faizal Jamlos, Mohd Farhani Zakaria, Nor Jack Soh, Ping Khairuddin Md Arshad, Mohd Padmanathan, Surentiran Rasheed, Ojo Rizal Kasjoo, Shahrir Taking, Sanna Zailan, Zarimawaty