Azremi Abdullah Al-Hadi
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Preferred name
Azremi Abdullah Al-Hadi
Official Name
Azremi, Abdullah Al-Hadi
Alternative Name
Abdullah Al-Hadi, Azremi
Al-Hadi, Azremi A.
Al-Hadi, A. A.
Azremi, A. A. H.
Main Affiliation
Scopus Author ID
57194469675
Researcher ID
A-6983-2015

Research Output

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  • Publication
    An ultrawideband full flexible 4 elements DGS based MIMO antenna for Sub-6 GHz wearable applications
    (IEEE, 2024-03)
    Bikash Chandra Sahoo
    ;
    Azremi Abdullah Al-Hadi
    ;
    Saidatul Norlyana Azemi
    ;
    Surentiran Padmanathan
    ;
    Sadia Afroz
    ;
    Wee Fwen Hoon
    ;
    Soh Ping Jack
    ;
    Che Muhammad Nor Che Isa
    ;
    Soumya Ranjan Mishra
    In this article, a compact wearable quad element MIMO antenna is presented operating at 4.5 GHz for 5G n77, n78, and n79 bands with the use of polyester substrate with a size of 80 × 82 × 0.4 mm3. Here T-shaped defected ground structure (DGS) technique has been utilized to improve the impedance bandwidth along with the reduction of the mutual coupling between the radiating elements. The antenna is evaluated in terms of reflection coefficient, gain, efficiency, and radiation pattern. The proposed MIMO antenna attained a maximum simulated gain of 4.3 dBi, and an efficiency of 96 % in the resonating band.
  • Publication
    A 3.5 GHz wearable antipodal vivaldi antenna for 5G applications
    (IEEE, 2024-01)
    Sadia Afroz
    ;
    Azremi Abdullah Al-Hadi
    ;
    Surentiran Padmanathan
    ;
    Saidatul Norlyana Azemi
    ;
    Wee Fwen Hoon
    ;
    Bikash Chandra Sahoo
    ;
    Yen San Loh
    ;
    Che Muhammad Nor Che Isa
    ;
    Lun Hao Tung
    ;
    Lai Ming Lim
    ;
    Zambri Samsudin
    ;
    Idris Mansor
    ;
    Soh Ping Jack
    This paper represents a wideband wearable antenna for 5G applications. In this proposed design, an antipodal vivaldi antenna structure is implemented on a polyimide and polyester combined substrate. The 120 × 95 × 0.82 mm3 sized antenna acquired a wide bandwidth of 910 MHz with a realized gain of 5.42 dBi and efficiency of 96 percent.
      10  2
  • Publication
    A wideband wearable antenna using inverse partial ground designed using characteristic mode analysis
    (IEEE, 2020)
    Bashar Bahaa Qas Elias
    ;
    Ping Jack Soh
    ;
    Azremi Abdullah Al-Hadi
    ;
    Saidatul Norlyana Azemi
    The design of a wearable wideband textile antenna based on a loop structure and fed using a coplanar waveguide line is proposed in this work. Characteristic mode analysis is used to first estimate the radiating modes on the structure. This is to ensure that the optimal mode significance is chosen. Analysis of modal significance enabled the first four modes to be identified from the structure. In this paper, the antenna is proposed to designed with an inverse partial ground (IPG) to enhance the bandwidth. It is shown that this IPG method improved impedance bandwidth to 1560 MHz (60.57%), indicating a bandwidth broadening of about 370 MHz (11.61%). A compact size of 70×70 mm2(0.57 × 0.57 ?g) is also maintained, with a realized gain of 4.23 dBi. Finally, the proposed antenna is fabricated and measured to validate the analysis experimentally, indicating a good agreement with simulations.
      3  11
  • Publication
    Horn Antenna Gain Enhancement using 3-D Printed Dielectric Lens for Dielectric Properties Measurement
    ( 2023)
    Renukka Sivakumar
    ;
    Saidatul Norlyana Azemi
    ;
    Azremi Abdullah Al-Hadi
    ;
    Zahari Awang Ahmad
    ;
    Kok Yeow You
    ;
    Lee Yeng Seng
    ;
    Soh Ping Jack
    A 3-D printed dielectric lens for gain enhancement of horn antenna from 18 GHz to 40 GHz is presented in this paper. Fused deposition modelling (FDM) is used to fabricate the Acrylonitrile butadiene styrene (ABS) lensas it is one of the well-known 3-D printing techniques. The results with and without dielectric lens are analyzed and compared from the simulation. From simulation results with thedielectric lens, a maximum gain of 26.7 dBi was achieved. The dielectric lens of 21.72 mm thickness was able to provide a gain enhancement up to 26.7 dBi when compared to the simulation result without the dielectric lens. The proposed dielectric lens can improve the gain of the horn antenna as good agreement between literature, simulation and measurement was achieved.
      7  3
  • Publication
    Compact full flexible vivaldi antenna for 3.5 GHz wearable applications
    (IEEE, 2023)
    Bikash Chandra Sahoo
    ;
    Azremi Abdullah Al-Hadi
    ;
    Saidatul Norlyana Azemi
    ;
    Wee Fwen Hoon
    ;
    Surentiran Padmanathan
    ;
    Sadia Afroz
    ;
    Che Muhammad Nor Che Isa
    ;
    Yen San Loh
    ;
    Muhammad Syahir Mahyuddin
    ;
    Lai Ming Lim
    ;
    Zambri Samsudin
    ;
    Idris Mansor
    ;
    Soh Ping Jack
    In this paper, a compact wearable Vivaldi antenna resonating at 3.5 GHz is proposed for 5G n77, and n78 bands. It is designed upon a flexible polyester substrate having dielectric constant (εr) of 1.34 and loss tangent (tan δ) of 0.005. The antenna parameters were optimized via parametric analyses using CST software with a size of 45 × 45 × 0.4 mm3 (length × width × height). The antenna is evaluated in terms of reflection coefficient, gain, efficiency, radiation pattern, and surface current density. This antenna attained a maximum simulated gain of 4.7 dBi, and an efficiency of 98 % in the resonating band.
      7  1
  • Publication
    A Review of Antennas for Picosatellite Applications
    ( 2017)
    Abdul Halim Lokman
    ;
    Ping Jack Soh
    ;
    Saidatul Norlyana Azemi
    ;
    Herwansyah Lago
    ;
    Symon K. Podilchak
    ;
    Suramate Chalermwisutkul
    ;
    Mohd Faizal Jamlos
    ;
    Azremi Abdullah Al-Hadi
    ;
    Prayoot Akkaraekthalin
    ;
    Steven Gao
    Cube Satellite (CubeSat) technology is an attractive emerging alternative to conventional satellites in radio astronomy, earth observation, weather forecasting, space research, and communications. Its size, however, poses a more challenging restriction on the circuitry and components as they are expected to be closely spaced and very power efficient. One of the main components that will require careful design for CubeSats is their antennas, as they are needed to be lightweight, small in size, and compact or deployable for larger antennas. This paper presents a review of antennas suitable for picosatellite applications. An overview of the applications of picosatellites will first be explained, prior to a discussion on their antenna requirements. Material and antenna topologies which have been used will be subsequently discussed prior to the presentation of several deployable configurations. Finally, a perspective and future research work on CubeSat antennas will be discussed in the conclusion.
      26  1
  • Publication
    Dual Band Planar Inverted F Antenna (PIFA) with L-Shape Configuration
    ( 2017)
    Mohamad khlouf Munzer
    ;
    Saidatul Norlyana Azemi
    ;
    Ping Jack Soh
    ;
    Azremi Abdullah Al-Hadi
    ;
    Mohd Faizal Jamlos
    One of the most used antennas in mobile devices is planar inverted F antenna (PIFA). PIFA can be design in dual band frequencies due to the coverage of the wireless service in a mobile device that requires a multiple frequencies. However, the consideration of technical operation has to be combined with an evaluation of the antenna radiation impact on the users. A procedure of PIFA work in GSM (867-960MHz) and GSM (1710-1899MHz) is done using CST Software. The dual band frequency response is obtained by means of an insertion of an L-shaped slot, which is use to tune the operation frequencies. The prototype of the antenna is fabricated as model by CST Software and evaluated. It is found out that the PIFA antenna has a good efficiency, bandwidth as well as produce a maximum gain for the antenna. A key and innovative research is still underway to broaden performance parameters of the antenna.
      23  1