Browsing by Author "Dahlan, S. H."

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    Compact and Low-profile Textile EBG-based Antenna for Wearable Medical Applications
    (IEEE, 2017-07-27) Ashyap, A. Y. I.; Abidin, A. A.; Dahlan, S. H.; Shah, S. M.; Kamarudin, M. R.; Alomainy, A.
    A compact wearable antenna with a novel miniaturized EBG structure at 2.4 GHz for medical application is presented in this letter. The design demonstrates a robust, compact and low-profile solution to meet the requirements of wearable applications. The EBG structure reduces the back radiation and the impact of frequency detuning due to the high losses of human body. In addition, the structure improves the front-to-back ratio (FBR) by 15.5 dB. The proposed compact antenna with dimensions of 46 × 46 × 2.4 mm3 yields an impedance bandwidth of 27% (2.17-2.83 GHz), with a gain enhancement of 7.8 dBi and more than 95 % reduction in the SAR. Therefore, the antenna is a promising candidate for integration into wearable devices applied in various domains, specifically biomedical technology.
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    Steerable Higher-order Mode Dielectric Resonator Antenna with Parasitic Elements for 5G Applications
    (IEEE, 2017-10-12) Shahadan, N. H.; Jamaluddin, M. H.; Kamarudin, M. R.; Yamada, Y.; Khalily, M.; Jusoh, M.; Dahlan, S. H.
    This paper presents the findings of a steerable higher-order mode (TEy 1δ3) dielectric resonator antenna with parasitic elements. The beam steering was successfully achieved by switching the termination capacitor on the parasitic element. In this light, all of the dielectric resonator antennas (DRAs) have the same dielectric permittivity similar to that of 10 and was excited by a 50Ω microstrip with a narrow aperture. The effect of the mutual coupling on the radiation pattern and the reflection coefficient, as well as the array factor were investigated clearly using MATLAB ver. 2014b and ANSYS HFSS ver. 16. As the result, the antenna beam of the proposed DRA array managed to steer from -32° to +32° at 15 GHz. Furthermore, the measured antenna array showed the maximum gain of 9.25 dBi and the reflection coefficients which are less than -10 dB with the bandwidth more than 1.3 GHz, which is viewed as desirable for Device-to-Device communication (D2D) in 5G Internet of Things (IoT) applications.