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All Journal Bulletin of Electrical Engineering and Informatics Bulletin of Electrical Engineering and Informatics Bulletin of Electrical Engineering and Informatics Indonesian Journal of Electrical Engineering and Computer Science

Ping Jack Soh

Universiti Malaysia Perlis

Author-ID : 2460576

Computer Science & IT Electrical & Electronics Engineering Engineering

Published : 10 Documents Claim Missing Document

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Performance evaluation of 2-port MIMO LTE-U terminal antenna with user’s hand effect Ahmed Mohamed Elshirkasi; Azremi Abdullah Al-Hadi; Rizwan Khan; Ping Jack Soh
Bulletin of Electrical Engineering and Informatics Vol 8, No 1: March 2019
Publisher : Institute of Advanced Engineering and Science

This paper presents the performance evaluation of 2-port MIMO antenna for LTE-U sub 6 GHz band. The evaluation focuses on the effect of user’s hand in a uniform environment and the analysis were carried out on simulation and measurement data of antenna ports. Results show that the highest performance of the design is on the frequency range from 4.5 GHz to 5.5 GHz, and the ports have low envelope correlation coefficient (ECC) less than 0.16 in both cases of without and with user’s hand. However, the presence of the user’s hand reduces mean effective gain (MEG) of ports and diversity combining gain by more than 1.6 dB compared with no-hand case. The multiplexing efficiency is around 81% and reduced by the presence of the user’s hand to 55%. Despite this reduction; the design shows high spatial multiplexing capability in both cases. The capacity carried by the second transmission eigenmode is about 39% from the total capacity under waterfilling algorithm transmit power allocation.

Bandwidth and gain enhancement of a circular microstrip antenna using a DNG split ring resonator radome Ojo Rasheed; Mohd Faizal Jamlos; Ping Jack Soh; Mohd Aminudin Jamlos; Muammar Mohamad Isa
Bulletin of Electrical Engineering and Informatics Vol 8, No 2: June 2019
Publisher : Institute of Advanced Engineering and Science

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.

Study of multiple antennas with defected ground slot for low-band LTE application Wai Loon Cheor; Azremi Abdullah Al-Hadi; Ping Jack Soh; Mohd Faizal Jamlos
Bulletin of Electrical Engineering and Informatics Vol 8, No 1: March 2019
Publisher : Institute of Advanced Engineering and Science

This study is focused on highly coupled multiple antennas with defected ground slot techniques. Two Printed Inverted-F Antenna (PIFA) are positioned at the top edge of chassis symmetrically. Both antennas are operating at low-band Long-Term Evolution (LTE) with center frequency, 829MHz. Rectangular defected ground slot is implemented to reduce the coupling effect between the antennas on the ground plane of the small chassis. Parameter study of the rectangular defected ground slot is studied with different width, W and length, L. Furthermore, the optimized dimensions of rectangular defected ground slot, W and L are simulated and presented. The optimized defected ground slot reduced the mutual coupling up to -4.5 dB. The envelope correlation coefficient (ECC) achieved less than 0.5. The ground plane of the multiple antenna structure has been further investigated by introducing another slot with a gap of 1mm between them. The achieved result is not significant in term of S-parameter and ECC compared to single defected ground slot.

Co-Authors Ahmed Mohamed Elshirkasi Azremi Abdullah Al-Hadi Hamse Abdillahi Haji Omer Mohd Aminudin Jamlos Mohd Faizal Jamlos Mohd Faizal Jamlos Muammar Mohamad Isa Ojo Rasheed Rizwan Khan Saidatul Norlyana Azemi Wai Loon Cheor

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Journal : Bulletin of Electrical Engineering and Informatics