Browsing by Author "Iddi, Hashim U."
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Item Analysis of the Architecture and MAC Protocol for Power-line Networks(2003) Iddi, Hashim U.; Kissaka, Mussa; Mvungi, Nerey H.Item 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.Item 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.Item Dual-band Circular Patch Antenna for wideband application(IEEE, 2013) Alabidi, Ebrahim S.; Kamarudin, M. R.; Rahman, T. A.; Iddi, Hashim U.; Jamlos, M. F.A Circular Patch Antenna for wideband application is presented in this paper. The antenna has been designed, simulated and fabricated on an FR4 substrate with dielectric constant (εr) of 4.4 and thickness of 1.6mm. A dual feed approach has been used in the design of the proposed wideband antenna. The dual-band circular patch antenna is smaller than the conventional antenna for wideband application. The final optimized design is 40×50mm2. The measured and simulated return loss results and simulated radiation pattern results of proposed antenna has been presented.Item Eye Shaped Fabric Antenna for UWB Application(IEEE, 2013) Yahya, R.; Kamarudin, M. R.; Seman, N.; Iddi, Hashim U.This paper presents a fully fabric Eye shaped antenna for Ultra-wideband (UWB) applications. The effect of using cutting slots on the ground plane is investigated. By using Coplanar Waveguide (CPW)-fed, the implementation of a semicircular and two triangular cutting slots have improved the antenna bandwidth. Details of the Eye shaped antenna design and simulated and measured return loss results are presented.Item 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.Item M-Shape Surrounded with Ring Patch Wideband Monopole Printed Antenna(Wiley, 2011-12-15) Aghda, Majid R.; Kamarudin, M. R.; Iddi, Hashim U.In this article, a novel shape of a ring printed antenna is presented. Antenna is designed for wideband applications. There is an M-shape patch inside the ring, which is optimized for wideband applications. The antenna operates between 2.05 and 6.85 GHz frequency bands. The measured bandwidth is about 107.87%. The proposed antenna has fabricated and tested. It has been fabricated on 30 × 51 mm2 FR4 board. A novel shape of ground plane has been used for increasing the bandwidth and removing some ripples in the result. The return loss results have been presented based on simulation and measurement. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett, 54:482–486, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26541Item Multi-band Circular Patch Antenna for Wideband Application(2013-08) Aabidi, Ebrahim S.; Kamarudin, M. R.; Rahman, T. A.; Iddi, Hashim U.This paper presents a multi-band circular patch antenna for wideband applications. The antenna operates at 1.5, 2.8, 4.0, 4.8, 7.5 and 8.8 GHz frequency bands. The antenna has been designed, simulated and fabricated on an FR4 substrate with dielectric constant ("r) of 4.4 and thickness of 1.6 mm. A dual feed approach has been used in the design of the proposed wideband antenna. The multi-band circular patch antenna is smaller than the conventional antenna for wideband application. The ¯nal optimized design is 50 £ 50mm2. The measured and simulated return loss results and simulated radiation pattern results of proposed antenna has been presented. The dual feed improves the gain of the proposed antenna. The measured and simulated results show that the proposed antenna provides good performance in term of return loss and radiation pattern for wideband applications.Item Novel Dual-Band B-Shaped Printed Monopole Antenna for MIMO Application(2013) Iddi, Hashim U.; Kamarudin, Muhammad R.; Rahman, Tharek A.; Jamlos, M. F.; Aghda, Majid R.Proposed antenna consists of B-shaped element which operates at dual-band frequencies (2.45 and 5.8 GHz). The antenna has been simulated using CST software and the prototype has been fabricated on FR4 substrate. The impedance bandwidths (BWs) that have been achieved are 29.9% and 33.8% for 2.45GHz and 5.8GHz bands respectively. The mutual coupling and correlation coefficient have also been investigated in which the antenna provides -22dB of mutual coupling and 0.02 of correlation coefficient. The proposed design achieves low mutual coupling and correlation coefficient at a separation distance of λ 12 between antenna arrays. There is good agreement between the measurement and simulation results in terms of return loss and radiation pattern.Item Optimization of Radial Line Slots Array Antenna Design for Satellite Communications(IEEE, 2013) Iliya, S. Z.; Rahman, T. A.; Iddi, Hashim U.; Purnamirza, T.; Orakwue, S. I.; Elijah, O.This paper presents a numerical method of identifying the beam squinting optimal design parameters. It is aimed at eradicating the arbitrary method of selection of phi, (φ) thetaT(θT) and phiT(φT) which improves the overall production process. Arbitrary selection of design parameters for beam squinting method which has been identified to solve the inherent return loss problems associated with the linearly polarized radial line slots array (LP-RLSA) design is time wasting and slows satellite design and manufacturing process. Results from the numerical solutions are computed using CST microwave studio (CST 2010); an antenna design software. Simulation results were compared with those obtained from literatures and it showed excellent agreement).Item P-shape Monopole Antenna Design for WBAN Application(2013-03) Aabidi, Ebrahim S.; Kamarudin, M. R.; Rahman, T. A.; Iddi, Hashim U.This paper presents P-shaped monopole antenna for WBAN application for 3.1 to 5.1 GHz frequency band. The design and simulation of proposed antenna for WBAN applications in the free space and close proximity of body surface has been done using CST Microwave Studio. The proposed antenna was designed on the FR4 substrate with dielectric constant, "r of 4.4 and thickness of 1.6 mm. The ¯nal optimized design is 32 £ 28mm2. The antenna is suitable to be deployed for WBAN application.Item 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].Item 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.Item Transparent Antenna Design for Wimax Application(2013) Azini, Alyaa S.; Kamarudin, Muhammad R.; Rahman, Tharek A.; Iddi, Hashim U.; Abdulrahman, Amuda Y.; Jamlos, Mohd F.A transparent monopole antenna operating at 2.30 GHz is presented in this paper. The radiating element and ground plane are both designed using AgHT-4, while the substrate is made of glass. The simulated and measured impedance bandwidths (BWs) are 41.89% (2.00-3.06 GHz) and 90.91% (1.5-4.00 GHz), respectively. These results were obtained by using a suitable arc-shape slot on the ground plane; and the BWs cover the IEEE 802.16e standard for WiMAX application in the 2.30 GHz band. The gain of proposed antenna is 3.16 dBi, and there is close agreement between measurement and simulation results, in terms of return loss and radiation patterns.Item 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.Item Triple-Band Cpw-Fed Planar Monopole Antenna for Wlan/Wimax Application(Wiley, 2013-06-23) Iddi, Hashim U.; Kamarudin, Muhammad R.; Rahman, Tharek A.; Abdulrahman, Amuda Y.; Khalily, Mohsen; Jamlos, M. F.A triple-band planar monopole antenna is presented in this article. The antenna consists of three strips which correspond to operating frequency bands of 2.4, 3.5, and 5.8 GHz. The proposed antenna has been designed, simulated, and fabricated on 20 × 38 mm2 FR4 board. There is good agreement between simulation and measurement results in terms of return loss and radiation pattern. The proposed antenna provides measured −10 dB bandwidths of 200 MHz for the 2.4 GHz (from 2.36 to 2.56 GHz); 620 MHz for the 3.5 GHz (from 3.48 to 4.10 GHz); and 1.38 GHz for 5.8 GHz (from 5.65 to 7.03 GHz). Moreover, the antenna provides the measured gain of 4.73, 1.66, and 3.28 dBi for 2.4, 3.5, and 5.8 GHz, respectively. The radiation characteristics have proven that the proposed antenna seems to be a good potential candidate for WLAN/WiMAX applications.Item Triple-Band Cpw-Fed Planar Monopole Antenna for Wlan/Wimax Application(Wiley, 2013) Iddi, Hashim U.; Kamarudin, Muhammad R.; Rahman, Tharek A.; Abdulrahman, Amuda Y.; Khalily, Mohsen; Jamlos, M. F.A triple-band planar monopole antenna is presented in this article. The antenna consists of three strips which correspond to operating frequency bands of 2.4, 3.5, and 5.8 GHz. The proposed antenna has been designed, simulated, and fabricated on 20 × 38 mm2 FR4 board. There is good agreement between simulation and measurement results in terms of return loss and radiation pattern. The proposed antenna provides measured −10 dB bandwidths of 200 MHz for the 2.4 GHz (from 2.36 to 2.56 GHz); 620 MHz for the 3.5 GHz (from 3.48 to 4.10 GHz); and 1.38 GHz for 5.8 GHz (from 5.65 to 7.03 GHz). Moreover, the antenna provides the measured gain of 4.73, 1.66, and 3.28 dBi for 2.4, 3.5, and 5.8 GHz, respectively. The radiation characteristics have proven that the proposed antenna seems to be a good potential candidate for WLAN/WiMAX applications. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2209–2214, 2013Item 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.