Nur Hidayah Ramli
Thumbnail Image
Preferred name
Nur Hidayah Ramli
Official Name
Nur Hidayah, Ramli
Alternative Name
Ramli, Nur Hidayah Binti
Ramli, Nur Hidayah
Ramli, Nur H.
Ramli, Nurhidayah
Ramli, N. H.
Main Affiliation
Scopus Author ID
57210707435

Research Output

Filters

5 1
3 1
5
Reset filters

Settings
Now showing 1 - 5 of 5
  • Publication
    Antenna Performance Enhancement using AMC Structure for 5G Frequency Range
    ( 2023-02-01)
    Norfatihah Bahari
    ;
    Rokhizan M.Z.N.
    ;
    Rashidah Che Yob
    ;
    Mohd Wafi Nasrudin
    ;
    Nur Hidayah Ramli
    ;
    Mohd Aminudin Jamlos
    ;
    Lago H.
    This paper presents a microstrip patch antenna operated at the fifth generation (5G) frequency range, which is at 3.5 GHz. To enhance the performance of the proposed antenna, an Artificial Magnetic Conductor (AMC) structure is implemented into the design. The 1x3 AMC is sandwiched between two FR-4 substrates and the performance of the proposed antenna is compared with the antenna without AMC structure. The simulated results prove that the proposed antenna offers better reflection coefficient with-50.45 dB compared to only-15.55 dB for the conventional antenna. Wider bandwidth is also achieved with 427 MHz of frequency bandwidth as opposed to only 135 MHz for the antenna without AMC. Besides that, the integration of AMC enhances the gain of the antenna when 3.7 dBi is achieved in contrast to only 3.21 dBi for the conventional antenna. Moreover, the efficiency of the antenna with AMC is also improved up to 68.54%. Furthermore, the ability to shrink 52.23% of the size of the antenna without AMC making it very favorable to be applied in 5G bands.
  • 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.
  • Publication
    Electromagnetic properties performance of MWCNTs/Polyester composites in X-band
    ( 2018)
    Y. S. Lee
    ;
    F. H. Wee
    ;
    K. Y. You
    ;
    C. Y. Lee
    ;
    Y. Y. Lee
    ;
    L. Zahid
    ;
    Nur Hidayah Ramli
    ;
    M. S. Shakhirul
    ;
    Nurulbariah Idris
    ;
    E. M. Cheng
    In this paper presents nano-composites based on polyester (PE) matrix with multi-walled carbon nanotubes (MWCNTs) as fillers have been developed for microwave absorbing materials. The MWCNTs/PE composite samples were fabricated with different weight ratio of MWCNTs (3 wt%, 5 wt%, and 10 wt%). The electromagnetic properties of different MWCNTs/PE composite have been determined by using rectangular waveguide technique and Agilent material measurement software. Moreover, the reflection loss (microwave absorption) of MWCNTs/PE composite have been calculated based on the basis of transmission line theory. The performance of electromagnetic properties and microwave absorption of MWCNTs/PE composite were analyzed in X-band frequency. The dielectric loss properties of the composite are increse with increasing in MWCNTs weight ratio. The microwave absorption results show that such 3 wt% MWCNTs/PE composites sample with 4 mm thickness has achieved less than -10 dB values (< 90 % microwave absorption) of reflection loss.
  • Publication
    Review on Patch Antennas for Unmanned Aerial Vehicle Application
    ( 2023-11-01)
    Nur Hidayah Ramli
    ;
    Seng L.Y.
    ;
    Liyana Zahid
    ;
    Hazry Desa
    The wide-ranging Unmanned Aerial Vehicle (UAV) applications make them one of the Internet of Things promising technologies. The vast potential of monitoring and surveillance for public safety threats using drones is a current issue for researchers. Antennas play an important part in UAV to create reliable communication links. There are different types of antennas that can be used for UAV application depending on antennas size, efficiency, gain, angle of radiation pattern, polarization, etc. This paper mainly focuses on patch antennas for UAV applications. In general, there are two types of patch antenna described which are single patch antenna and array antenna. The review of patch antennas can be a useful guideline to choose or design antenna for UAV applications in the future.
  • Publication
    Dual-Band MIMO Decagonal C-Shaped CSRR Metamaterial Textile Antenna for WLAN and 5G Applications
    ( 2023-01-01)
    Mashagba H.A.
    ;
    Hasliza A Rahim @ Samsuddin
    ;
    Mohd Najib Mohd Yasin
    ;
    Narongkul S.
    ;
    Liyana Zahid
    ;
    Nur Hidayah Ramli
    This study proposed an enhanced two-port dual-band textile Multiple-Input Multiple-Output (MIMO) antenna integrated with a metamaterial unit cell of symmetric decagonal C-shaped Complementary Split-Ring Resonator (CSRR) structure in terms of gain. The proposed MIMO antenna achieves an impedance bandwidth of 6.3% and a maximum up to 18.2% for lower and upper bands, respectively, at port 1. Mutual Coupling (MC) of less than -20 dB for both ports is obtained. The proposed antenna offers high realized gain of 5.6 dBi and 8 dBi at 2.45 GHz and 3.5 GHz, respectively, compared to existing dual-band MIMO textile antenna. Good diversity characteristics in respect of Envelope Correlation Coefficient (ECC) less than 0.001, and Diversity Gain (DG) of about 10 dB are achieved.
      1