Wee Fwen Hoon
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Preferred name
Wee Fwen Hoon
Official Name
Hoon, Wee Fwen
Alternative Name
Fwen Hoon, Wee
Wee, F. H
Hoon, Wee Fwen
Main Affiliation
Scopus Author ID
57215069158
Researcher ID
CFL-8965-2022

Research Output

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Now showing 1 - 6 of 6
  • Publication
    Flexible Co-Planar Waveguide (CPW)-Fed Y-Shaped Patch UWB Antenna for Off-Body Communication
    ( 2020-03-18)
    Kassim S.
    ;
    Hasliza A Rahim @ Samsuddin
    ;
    Soh Ping Jack
    ;
    Abdulmalek M.
    ;
    Muzammil Jusoh
    ;
    Jamaluddin M.H.
    ;
    Sabli N.S.
    ;
    Yassin M.N.
    ;
    Thennarasan Sabapathy
    ;
    Wee Fwen Hoon
    ;
    Mohamed Nasrun Osman
    ;
    Ismail N.
    This paper intends to design an Ultra-Wideband (UWB) antenna for future Internet of Things (IoT) applications for off-body Wireless Body Area Networks (WBAN) communication. An antenna based on the Y-shaped patch fed using co-planar waveguide (CPW) line, with a full ground plane is designed. It is implemented on two different substrates, namely a 5mm thick Rogers RO4350B and a 5-mm-thick felt textile. Parametric analysis of antenna is performed by changing its critical dimensions and monitoring parameters such as gain, bandwidth, efficiency, radiation pattern when using both substrates. Besides that, the bending effects towards reflection coefficient and radiation patterns are also studied. The final patch size with the Y-shaped slot is 36 × 40 mm2 for both substrates. The antenna is capable of providing coverage for the bands from 8 to 10 GHz. Finally, the antenna designed on RO4350B substrate outperforms the antenna designed on felt by about four times in terms of bandwidth, with 3.3 GHz (7.7-11 GHz).
  • Publication
    Enhanced microwave absorption of rice husk‐based pyramidal microwave absorber with different lossy base layer
    (The Institution of Engineering and Technology, 2020)
    Lee Yeng Seng
    ;
    Soh Ping Jack
    ;
    You Kok Yeow
    ;
    Wee Fwen Hoon
    ;
    Lee Chia Yew
    ;
    Gan Hong Seng
    ;
    Fareq Malek
    The size of pyramidal microwave absorbers (PMA) is one of the main considerations for their selection for use in anechoic chambers. In this work, a new type of PMA is introduced, with rice husk (RH) as its filler. Meanwhile, a lossy base layer is also introduced in the PMA using a combined RH and carbon nanotube (CNT) composite. To do so, the dielectric properties of the RH‐CNT composite are first investigated from 2–18 GHz by using a dielectric probe. Next, the microwave absorption properties of the PMA were investigated in terms of different height of the pyramidal structure and base layer. The free‐space method was used to measure the microwave absorption of PMA at oblique incident angles of 0° to 60°, respectively. Results indicated good microwave absorption characteristics in the 2–6 GHz with a height of 11.5 cm the PMA structure, and 1 cm thickness of the base layer. The lossy base layer is found to increase the bandwidth of the absorber and improve the microwave absorption of PMA in the lower GHz frequencies. Further investigations concluded that the microwave absorption performance of the PMA is dependent on its dielectric properties, size and base layer.
  • 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
    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
    Dielectric properties measurement and pH analysis for drinking water
    (IOP Publishing Ltd., 2020)
    Wee Fwen Hoon
    ;
    Yew Been Seok
    ;
    Soh Ping Jack
    ;
    Lee Yeng Seng
    ;
    Lee Oon Keng
    Every material has its own dielectric properties and it is also the same for water. In this research, dielectric properties measurement on water will be done to examine the water quality of drinking water whether it is safe to drink or not. Water quality in Malaysia, as well as access to water in general, is a major problem. The primary pollutants present in the water are oils, rubbish, suspended solids, sewage and toxic substances. These are consequences of untreated or only partially treated sewage caused by human activities. Thus, water quality in Malaysia is currently of some concern. The normal drinking water pH range mentioned in World Health Organization (WHO) and National Drinking Water Quality Standards (NDWQS) guidelines is between 6.5 and 8.5. The water may contain some residue even though the pH is in the range of 6 to 7.5 so it does not prove that the water is safe enough for drinking purpose. Thereby, the analysis about the water quality using the specific measuring instruments need to carry out to prove that the water in neutral pH may not be safe to drink as the pH does not prove the content of the water as clearly as dielectric properties. High Temperature Coaxial Probe as the dielectric properties measurement sensor will be used to provide better information compare to pH. The measurement parameters that had been used to determine the water quality is the dielectric constant. The results obtained from both pH and dielectric properties measurement values are been analyzed and compared and it shows that pH value for clean and contaminated water is at almost similar values while dielectric properties results show different for both clean and contaminated water.
      21  1