Browsing by Author "Dewan, R."

Now showing 1 - 7 of 7
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    Design of Dual-Band B-Shaped Monopole Antenna for MIMO Application
    (IEEE, 2012) Iddi, Hashim U.; Kamarudin, M. R.; Rahman, T. A.; Dewan, R.
    A dual-band B-shaped monopole antenna for MIMO application is presented. The proposed antenna consists of B-shaped element which operates at dual band frequencies of 2.45GHz and 5.8GHz. The prototype has been fabricated and when tested, the impedance bandwidths are 29.9% and 33.8% for 2.45GHz and 5.8GHz, respectively. Good agreement between the measurement and simulation results in term of return loss and radiation pattern have been obtained.
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    Design of triple band Artificial Magnetic Conductor
    (IEEE, 2012) Dewan, R.; Rahim, S. K. A.; Ausordin, S. F.; Iddi, Hashim U.
    This paper presents a design of Artificial Magnetic Conductor (AMC). The AMC operates in three operating frequencies which are 2.3 GHz, 5.8 GHz and 8.36 GHz with the bandwidth of 5.64 %, 1.73% and 3.58 % respectively. The size of AMC unit cells is relatively smaller compare to previous researches that have been done. Parametric results for the reflection phase diagram are also presented.
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    Improved Design of Tapering and through Element Series Antenna
    (IEEE, 2012) Dewan, R.; Rahim, S. K. A.; Ausordin, S. F.; Iddi, Hashim U.
    In this paper, an array of series fed antenna based on tapering patch width and through element is presented. The antenna has wide impedance bandwidth of 16.18% covering from 5.34 GHz to 6.28 GHz with a gain of 6.53 dBi. The use of through element technique reduces the overall length of array structure by 25.47%. It also has lower side lobe level, and wider impedance bandwidth compared to the past research.
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    Planar Cone-Shaped Monopole Antenna with Tapered Ground for UWB Application
    (IEEE, 2012) Iddi, Hashim U.; Kamarudin, M. R.; Rahman, T. A.; Dewan, R.
    Compared to the narrow band antenna design, ultra wideband (UWB) antenna design has a lot of challenges. One of such challenge is the requirement that the return loss must be below 10dB bandwidth from 3.1-10.6GHz throughout the UWB frequency range. Other challenges include low cost, small size, light weight and good radiation patterns [1]. One of the characteristic of conventional planar monopole antenna have narrow impedance bandwidth due to their high quality factor [2].
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    Reconfigurable Monopole Antenna for WLAN/WiMAX Applications
    (2013-03) Iddi, Hashim U.; Kamarudin, M. R.; Rahman, T. A.; Dewan, R.
    In this paper, a simple recon¯gurable monopole antenna for WLAN/WiMAX ap- plication is presented. The proposed antenna has been designed and compared to a three patch strips triple band monopole antenna which operate at 2.45 GHz, 3.5 GHz and 5.8 GHz frequency bands. The antenna has been simulated using CST software studio and fabricated on FR4 substrate. The proposed antenna provides triple bands in which the bandwidth of 367MHz for 2.45 GHz, 799MHz for 3.5 GHz and a bandwidth of 3.47 GHz for 5.8 GHz has been obtained. The results show that the measured and simulated return loss characteristic of the optimized antenna satis¯es the requirement of the 2.4/5.8 GHz WLAN and 3.5 GHz WiMAX antenna application. The proposed recon¯gurable antenna is low pro¯le, compact and small in size and show good performance for WLAN/WiMAX bands. There is good agreement between the measurement and simulation results in terms of return loss and radiation pattern.
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    Triple Band Planar Monopole Antenna for MIMO Application
    (2013-08) Iddi, Hashim U.; Kamarudin, M. R.; Rahman, T. A.; Abdulrahman, Amuda Y.; Dewan, R.; Azini, Alyaa S.
    A triple band planar monopole antenna for MIMO application is presented in this paper. The antenna array consists of two triple band monopole antennas with three copper strips, which operate at three frequency bands (2.4, 3.5 and 5.8 GHz). The antenna has been simulated using CST software and the prototype has been fabricated using FR4 substrate. The antenna provides the ¡10 dB bandwidths (BWs) of 308MHz (from 2.2275 to 2.5354 GHz), 472MHz (from 3.337 to 3.809 GHz) and 1.688 GHz (from 5.488 to 7.176 GHz) for 2.4, 3.5 and 5.8 GHz respectively. The antenna array achieve low mutual coupling of ¡22 dB at separation distance of 10 mm, which is approximately ¸/12. There is good agreement between the measurement and simulation results in terms of return loss and radiation pattern.
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    X-Polarization Array Antenna with Parallel Feeding for Wimax 3.55 Ghz Application
    (IEEE, 2011) Dewan, R.; Rahim, S. K. A.; Ausordin, S. F.; Iddi, Hashim U.; Abdi. Aziz, M. Z. A.
    An X-Polarization array microstrip patch antenna for WiMAX application is introduced in this paper. The array antenna operates at WiMAX frequency of 3.55 GHz. The substrate used is FR-4 with the thickness of 1.6 mm, relative permittivity of 4.5 and loss tangent of 0.019. The antenna use parallel feeding network to feed all the eight elements with coaxial port. The array has gain of 6 dBi, and directivity 8.754 dBi. The array antenna only requires single input port unlike conventional X-Polarization array antenna that uses multiple input port application. Parametric study of cross angle to antenna performance is studied which have not been discussed in the past research and coupling between the elements in the array is presented.