Browsing by Author "Ali, Jawad K."

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Citation Count: Al-Mihrab, Mohammed A.; Salim, Ali J.; Ali, Jawad K. (2020). "A Compact Multiband Printed Monopole Antenna With Hybrid Polarization Radiation for GPS, LTE, and Satellite Applications", IEEE Access, Vol. 8, pp. 110371-110380.
A Compact Multiband Printed Monopole Antenna With Hybrid Polarization Radiation for GPS, LTE, and Satellite Applications
(2020) Al-Mihrab, Mohammed A.; Salim, Ali J.; Ali, Jawad K.
A new compact printed monopole antenna is presented in this paper. An open-loop hexagonal radiator excited by a microstrip feed line, which is printed on top of the substrate, which is FR4 type, while on another side, a partial ground plane is fixed and embedded with two pairs of slits as well as a pair of rectangular strips. Triple operating bands with two different polarization types are obtained. The lower band has right-hand circular polarization (RHCP) characteristic, whereas the upper band has left-hand circular polarization (LHCP) characteristic means that a dual-band dual-sense circular polarization (CP). Concerning the middle band, a linear polarization (LP) has been gotten in this antenna. Numerical analysis and experimental validation of the proposed antenna structure have been performed, and results are demonstrated. The measured impedance bandwidths (IBWs) are 14.7% (1.478-1.714 GHz), 6.8% (2.54-2.72 GHz), and 13.1% (4.29-4.89 GHz), respectively. The measured 3-dB axial ratio bandwidths (ARBWs) are 6.2% (1.510-1.606 GHz), and 22.7% (4.035-5.07 GHz) for the lower and the upper band, respectively. So, it's suitable for covering modern wireless applications such as GPS (Global Positioning System), LTE (Long Term Evaluation), and Satellite.
Citation Count: Mezaal, Y.S.; Eyyuboglu, Halil T.; Ali, J.K., "A New Design of Dual Band Microstrip Bandpass Filter Based On Peano Fractal Geometry: Design and Simulation Results", Mediterranean Microwave Symposium, (2013).
A New Design of Dual Band Microstrip Bandpass Filter Based On Peano Fractal Geometry: Design and Simulation Results
(2013) Mezaal, Yaqeen S.; Eyyuboğlu, Halil T.; Ali, Jawad K.; 7688
The proposed filter design topology is based on dual coupled resonators constructed in the form of Peano fractal geometry. A dual-band microstrip bandpass filter with a quasi-elliptic response has been designed for first time based on 1st iteration Peano fractal geometry at resonant frequencies of 2.25 GHz and 4.825 GHz using a substrate of a relative dielectric constant of 10.8 and thickness of 1.27 mm. The performance of the bandpass filter structure has been analyzed using a method of moments (MoM) based software package, Microwave Office 2009, from Advanced Wave Research Inc. Results show that this filter possesses good frequency response characteristics in addition to dual bands gained which can be used for modern communication applications.
Citation Count: Mezaal, Yaqeen S.; Eyyuboglu, Halil T.; Ali, Jawad K. "A Novel Design of Two Loosely Coupled Bandpass Filter Based on Hilbert-zz Resonator with Higher Harmonic Suppression", 2013 Third International Conference On Advanced Computing & Communication Technologies (Acct 2013), pp. 343-347, (2013).
A Novel Design of Two Loosely Coupled Bandpass Filter Based On Hilbert-Zz Resonator With Higher Harmonic Suppression
(IEEE, 2013) Mezaal, Yaqeen S.; Eyyuboğlu, Halil T.; Ali, Jawad K.; 7688
New characteristics of fractal design scheme has been introduced to generate compact two poles capacitively coupled microstrip bandpass filter by using additional coupling stubs for different wireless applications. The presented fractal scheme is based on specific type of Hilbert space-filling curve which is called Hilbert-zz fractal geometry. The performance of generated bandpass filter structure has been analyzed using Sonnet software package with a relative dielectric constant of 9 and a substrate thickness of 1.27 mm. Results show that these filters possess good transmission and return loss characteristics, besides higher harmonics suppressions; meeting the specifications of most of wireless communication systems.
Citation Count: Mezaal, Yaqeen S.; Ali, Jawad K., "Investigation of Dual-Mode Microstrip Bandpass Filter Based on SIR Technique", Plos One, Vol. 11, No. 10, (2016).
Investigation of Dual-Mode Microstrip Bandpass Filter Based on SIR Technique
(Public Library Science, 2016) Mezaal, Yaqeen S.; Ali, Jawad K.
In this paper, a new bandpass filter design has been presented using simple topology of stepped impedance square loop resonator. The proposed bandpass filter has been simulated and fabricated using a substrate with an insulation constant of 10.8, thickness of 1.27mm and loss tangent of 0.0023 at center frequency of 5.8 GHz. The simulation results have been evaluated using Sonnet simulator that is extensively adopted in microwave analysis and implementation. The output frequency results demonstrated that the proposed filter has high-quality frequency responses in addition to isolated second harmonic frequency. Besides, this filter has very small surface area and perceptible narrow band response features that represent the conditions of recent wireless communication systems. Various filter specifications have been compared with different magnitudes of perturbation element dimension. Furthermore, phase scattering response and current intensity distribution of the proposed filter have been discussed. The simulated and experimental results are well-matched. Lastly, the features of the proposed filter have been compared with other designed microstrip filters in the literature.
Citation Count: Mezaal, Y.S., Ali, J.K., Eyyuboğlu, H.T. (2015). Miniaturised microstrip bandpass filters based on Moore fractal geometry. International Journal Of Electronics, 102(8), 1306-1319. http://dx.doi.org/10.1080/00207217.2014.971351
Miniaturised microstrip bandpass filters based on Moore fractal geometry
(Taylor&Francis LTD, 2015) Mezaal, Yaqeen S.; Ali, Jawad K.; Eyyuboğlu, Halil T.; 7688
This paper presents new microstrip bandpass filter design topologies that consist of dual edge-coupled resonators constructed in the form of Moore fractal geometries of second and third iteration levels. The space-filling property for proposed fractal filters has found to produce reduced size shapes in accordance with sequential iteration levels. These filters have been prepared for ISM band applications at a centre frequency of 2.4GHz using a substrate with a dielectric coefficient of 10.8, dielectric thickness of 1.27mm and metallisation thickness of 35 mu m. The output responses of each fractal bandpass filter have been determined by a full-wave-based electromagnetic simulator Sonnet software package. Simulated and experimental results are approximately compatible with each other. These responses clarify that these fractal filters have good transmission and return loss characteristics with blocked higher harmonics in out-of-band regions
Citation Count: Mezaal, Yaqeen S.; Eyyuboglu, Halil T.; Ali, Jawad K. "New Dual Band Dual-Mode Microstrip Patch Bandpass Filter Designs Based on Sierpinski Fractal Geometry", 2013 Third International Conference On Advanced Computing & Communication Technologies (Acct 2013), pp. 348-352, (2013).
New Dual Band Dual-Mode Microstrip Patch Bandpass Filter Designs Based On Sierpinski Fractal Geometry
(IEEE, 2013) Mezaal, Yaqeen S.; Eyyuboğlu, Halil T.; Ali, Jawad K.; 7688
Dual band dual mode chebychev microstrip bandpass filter designs are introduced for first time in this paper. The proposed filter designs are based on the use of dual mode square slotted patch microstrip resonator. These filter structures are fractally generated using Sierpinski fractal curve geometry applied to the conventional square microstrip patch from 1st to 2nd iteration levels where the first band designed at fundamental frequencies (5.475, 5.45 and 5.4) GHz for each iteration while the second band(8.925, 9.15, 9.05) GHz for each iteration. These filters have been designed using a substrate with a dielectric constant of 10.8 and thickness of 1.27mm. The performance of filter structures, based on resonators has been evaluated using a full-wave based electromagnetic simulator Sonnet software package. Performance simulation results show that these filter structures are compact in addition to good frequency responses and narrow bands gained.
Citation Count: Mezaal, Y.S., Eyyuboğlu, H.T., Ali, J.K. (2014). New microstrip bandpass filter designs based on stepped Impedance hilbert fractal resonators. IETE Journal Of Research, 60(3), 257-264. http://dx.doi.org/10.1080/03772063.2014.922018
New microstrip bandpass filter designs based on stepped Impedance hilbert fractal resonators
(Taylor&Francis LTD, 2014) Mezaal, Yaqeen S.; Eyyuboğlu, Halil T.; Ali, Jawad K.; 7688
The proposed microstrip bandpass filters in this paper have compact sizes and narrow band responses which are the requirements of modern wireless communication circuits. These filters are constructed from dual-edge coupled resonators; each resonator is based on applying step impedance resonator generator on first and second iteration of Hilbert fractal resonators on each segment of each iteration level. They have been designed for the industrial, scientific, and medical band (ISM) band applications at a centre frequency of 2.4 GHz using a substrate with a dielectric coefficient of 9.6 and thickness of 0.508 mm. The performance of bandpass filters has been analysed using a method of moments (MoM) based on software package, Microwave Office 2009, from Advanced Wave Research Inc., which is widely adopted in microwave research and industry. Simulation responses show that these filters possess good frequency response characteristics with second harmonics suppression. Moreover, these filters showed noticeable miniaturization which is an important feature for many communication applications. The simulated and measured results are in good agreement.
Citation Count: Mezaal, Y.S., Eyyuboğlu, H.T., Ali, J.K. (2014). Wide bandpass and narrow bandstop microstrip filters based on hilbert fractal geometry: design and simulation results. Plos One, 9(12). http://dx.doi.org/10.1371/journal.pone.0115412
Wide bandpass and narrow bandstop microstrip filters based on hilbert fractal geometry: design and simulation results
(Public Library Science, 2014) Mezaal, Yaqeen S.; Eyyuboğlu, Halil T.; Ali, Jawad K.; 7688
This paper presents new Wide Bandpass Filter (WBPF) and Narrow Bandstop Filter (NBSF) incorporating two microstrip resonators, each resonator is based on 2nd iteration of Hilbert fractal geometry. The type of filter as pass or reject band has been adjusted by coupling gap parameter (d) between Hilbert resonators using a substrate with a dielectric constant of 10.8 and a thickness of 1.27 mm. Numerical simulation results as well as a parametric study of d parameter on filter type and frequency responses are presented and studied. WBPF has designed at resonant frequencies of 2 and 2.2 GHz with a bandwidth of 0.52 GHz, -28 dB return loss and -0.125 dB insertion loss while NBSF has designed for electrical specifications of 2.37 GHz center frequency, 20 MHz rejection bandwidth, -0.1873 dB return loss and 13.746 dB insertion loss. The proposed technique offers a new alternative to construct low-cost high-performance filter devices, suitable for a wide range of wireless communication systems.