Rashidah Che Yob
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Preferred name
Rashidah Che Yob
Official Name
Rashidah, Che Yob
Alternative Name
Yob, Rashidah Che
Che Yob, Rashidah
Yob, R. C.
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Scopus Author ID
57215009095

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  • Publication
    Comparison of RFID Tag structure for wearable applications system
    (Semarak Ilmu Publishing, 2025-04)
    Nur Hidayah Ramli
    ;
    Rashidah Che Yob
    ;
    Liyana Zahid
    ;
    Norfatihah Bahari
    This paper proposed a comparison of Radio- Frequency Identification (RFID) tags for wearable applications. Three types of proposed RFID tag structures are designed which are square, hexagonal, and octagonal shapes to operate at frequencies 1.0GHz to 12GHz. The RFID tag structure consists of several meander line radiators. The structure of the meandered line radiator is attached to the cotton and jeans fabric. A monostatic radar system which consists of a Vector Network Analyzer and a horn antenna is configured to test the RFID tag in real life. The performances of RFID tags are evaluated in terms of the reflection coefficient (S11) and their operating frequency. The results will be guidelines while designing RFID tag structures for wearable application systems in the future.
  • Publication
    Artificial Magnetic Conductor to Enhance Microstrip Patch Textile Antenna Performance for WiMAX Application
    ( 2020-12-18)
    Liyana Zahid
    ;
    Hanif Suhairi Abu Bakar
    ;
    Khairul Najmy Abdul Rani
    ;
    Thennarasan Sabapathy
    ;
    Mohd Aminudin Jamlos
    ;
    Mohamad Rizal Abdul Rejab
    ;
    Khairil Syahmi Musa
    ;
    Hamzah D.
    ;
    Rashidah Che Yob
    ;
    Norfatihah Bahari
    A rectangular microstrip patch textile antenna with Artificial Magnetic Conductor (AMC) operated at the center frequency of 5.80 gigahertz (GHz) for Worldwide Interoperability for Microwave Access (WiMAX) application was designed and simulated using the CST Microwave Studio 2016 and fabricated in this study. The use of AMC could solve the inflexibility of FR4 substrate that limits human body movement and reduce the radiation scattered on the human body whilst increasing the antenna gain and directivity. The antenna consists of 5 5 square shape gap of AMC unit cells ground layer using ShieldIt Super, five substrate layers using cotton (viscose) fabric as well as patch layer and another ground layer using the same ShieldIt Super. AMC is a metamaterial that imitates the conduct of zero reflection phase of Perfect Magnetic Conductor (PMC) on the resonant frequency not evidently existed in nature. Overall, the antenna with AMC has the significant return loss, S11 below than -30 decibel (dB), gain improved to more than 8 dB, and directivity elevated to more than 9 dBi at resonant frequency near to 5.80 GHz, respectively.
      10  34
  • Publication
    A switchless pentagon-shaped reconfigurable antenna for radar applications
    (IOP Publishing, 2020)
    Norfatihah Bahari
    ;
    Rashidah Che Yob
    ;
    Liyana Zahid
    This paper proposes a switchless pentagon-shaped microstrip patch antenna for radar and radionavigation applications. The antenna is built on Rogers RT5880 substrate with five rectangular radiating elements on top. Five ports have been set up to operate at 13.5 GHz resonant frequency. Besides having reflection coefficient below -10 dB, the antenna also offers high gain when about 8.29 dB is achieved. The proposed antenna also has a bi-directional radiation pattern with 360° of beam steering.
      3  24
  • Publication
    Cylindrical Dielectric Resonator as Dielectric Matching on Microwave Amplifier for the Unconditionally Stable and Conditionally Stable Transistor at 5 GHz Frequency
    ( 2022-12-01)
    Rashidah Che Yob
    ;
    Mahyuddin N.M.
    ;
    Ain M.F.
    ;
    Mohd Aminudin Jamlos
    ;
    Nur Hidayah Ramli
    ;
    Norfatihah Bahari
    ;
    Mohd Wafi Nasrudin
    ;
    Liyana Zahid
    Stability and matching techniques on microwave amplifier have been an important consideration to maintain their required performances, but typically its frequency dependent. Thus, a frequency variable mechanism is required. The dielectric matching employing the stability and matching techniques on microwave amplifier with cylindrical dielectric resonator has been investigated and realized. The cylindrical dielectric resonator (CDR) with parallel microstrip lines is proposed at 5 GHz frequency for unconditionally stable and conditionally stable transistor as dielectric matching. Hence, the proposed dielectric resonator with +2 mm spacing and 155Ëš of curved configuration indicated the best performances for preliminary study. The result improves the performance of the parallel inhomogeneous CDR by 9.77%. Subsequently, the homogeneous CDR is also successfully working as the variable frequency mechanism for unconditionally stable and conditionally stable transistor at 5 GHz frequency in maintaining their stability performances.
      36  1
  • Publication
    Left-handed metamaterial wearable antenna at 5G frequency range for wireless body area network
    (IEEE, 2023)
    Nur Hidayah Ramli
    ;
    Muhammad Afif Farhan Lokman
    ;
    Norfatihah Bahari
    ;
    Liyana Zahid
    ;
    Rashidah Che Yob
    ;
    Mohd Hafizuddin Mat
    ;
    Mohd Aminudin Jamlos
    ;
    Laith H. Alzubaidi
    ;
    Abbas Hameed Abdul Hussein
    Wearable antennas are typically required to be small in weight, provide high bandwidth, high gain and efficiency, low price, and be installation-free for many modern applications. Due to the non-static human movement, an antenna with wide-angle scanning is necessary. This project is carried out by designing a small metamaterials wearable antenna at a 5G frequency range. The combination of left-handed metamaterial (LHM) and the wearable antenna is designed to operate for such a system. Results prove that the small wearable metamaterial antenna offers good performances where the gain is 5.8 dBi with an efficiency of 91.86% and provides an omnidirectional radiation pattern compared to the wearable antenna without LHM structure. The communication links of the antenna between the base station and the human body are investigated. The antenna can receive the signals for long distances may be up to 2 meters with wide angles. All the results will be a guideline while designing the systems in the future.
      12  3