Browsing by Author "Mezaal, Yaqeen S."

Now showing 1 - 15 of 15

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 Tanyer, "A New Narrow Band Dual-Mode Microstrip Slotted Patch Bandpass Filter Design Based on Fractal Geometry", 2012 7th International Conference On Computing and Convergence Technology (Iccct2012), pp. 1180-1184, (2012)
A New Narrow Band Dual-Mode Microstrip Slotted Patch Bandpass Filter Design Based On Fractal Geometry
(IEEE, 2012) Mezaal, Yaqeen S.; Eyyuboğlu, Halil T.; 7688
A narrowband, compact, and easily fabricated microstrip bandpass filter design is introduced in this paper as a candidate for use in modern wireless systems. The proposed filter design is based on the use of dual-mode (two pole) square slotted microstrip resonator. This microstrip bandpass filter has the advantages of possessing much narrower and sharper performance responses than those of the single mode resonator and conventional square patch filter. The proposed microstrip filter structure is fractally generated using Sierpinski fractal curve geometry applied to the conventional square microstrip patch. Filter structures resulting from the successive iterations in the fractal generation process show a considerably low insertion loss, and sharper response of about 1% fractional bandwidth as compared with the conventional microstrip square patch filter of 3% fractional bandwidth designed at the same frequency using the same substrate material. The performance of filter structures, based on dual-mode resonators up to the third iterations, has been evaluated using a full-wave based electromagnetic simulator Sonnet software package. Performance simulation results show that these filter structures offer narrower fractional bandwidth percentages as compared with other types of non- fractalized filter structures.
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, Y.S.; Madhi, H.H.; Abd, T.; Khaleel, S.K.,"Cloud Computing Investigation for Cloud Computer Networks Using Cloudanalyst",Journal of Theoretical and Applied Information Technology, Vol. 96, No. 20, pp. 6937-6947, (2018).
Cloud Computing Investigation for Cloud Computer Networks Using Cloudanalyst
(Little Lion Scientific, 2018) Mezaal, Yaqeen S.; Madhi, H. H.; Abd, T.; Khaleel, S. K.; 7688
In this paper, the performances of load balancing algorithms; Round Robin, Equally Spread Current Execution, and Throttled, in two workload cases, normal and burst are investigated using CloudAnalyst simulator tool. The main objective is to examine the effect of three experiments for regular and irregular normal workloads on the performance of different load balancing algorithms as well as for bursty workload. Each test has two different configurations for parametric investigations. These parametric studies can be used to analyze any electronic service provided by cloud technology vendors in any institutions, especially those offer self-reporting details for every day.
Citation Count: Mezaal, Yaqeen Sabah; Al-Zayed, Ayman S., "Design of microstrip bandpass filters based on stair-step patch resonator", International Journal of Electronics, Vol. 106, No. 3, pp. 477-490, (2019).
Design of microstrip bandpass filters based on stair-step patch resonator
(Taylor&Francis LTD, 2019) Mezaal, Yaqeen S.; Al-Zayed, Ayman S.
In this research article, single pole bandpass filter using stair-step patch topology based on symmetrical and asymmetrical step impedance resonators has been designed for industrial, scientific and medical (ISM) band application. This filter has been modelled by Microwave Office simulator using RT/Duroid substrate constant of 10.8, the substrate thickness of 1.27 mm, loss tangent of 0.0023 and copper metallisation thickness of 0.035 mm. To enhance the stopband levels of filter response, two microstrip bandpass filters have been designed as two-pole configurations based on edge, and cross-coupled stair-step patch resonators using the same simulator tool and substrate specifications. The proposed filters have compact sizes of (0.311 x 0.233 for single pole filter, (0.578 x 0.24) for two-pole edge coupled filter and (0.566 x 0.234for two-pole cross-coupled filter designed at centre frequencies of 2.4, 2.46 and 2.41 GHz, respectively. These filters have interesting insertion loss and return loss magnitudes, narrow band frequency responses, second harmonic suppression and good stopband levels. Apart from ISM band applications, the proposed filters can be adopted in WLAN systems and Bluetooth applications for short-range devices. The experimental results for designed filters are of good consistency with the simulations.
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: Mazeel, Y.S., Eyyuboğlu, H.T. (2016). Investigation of new microstrip bandpass filter based on patch resonator with geometrical fractal slot. Plos One, 11(4). http://dx.doi.org/10.1371/journal.pone.0152615
Investigation of new microstrip bandpass filter based on patch resonator with geometrical fractal slot
(Public Library Science, 2016) Mezaal, Yaqeen S.; Eyyuboğlu, Halil T.; 7688
A compact dual-mode microstrip bandpass filter using geometrical slot is presented in this paper. The adopted geometrical slot is based on first iteration of Cantor square fractal curve. This filter has the benefits of possessing narrower and sharper frequency responses as compared to microstrip filters that use single mode resonators and traditional dual-mode square patch resonators. The filter has been modeled and demonstrated by Microwave Office EM simulator designed at a resonant frequency of 2 GHz using a substrate of epsilon(r) = 10.8 and thickness of h = 1.27 mm. The output simulated results of the proposed filter exhibit 22 dB return loss, 0.1678 dB insertion loss and 12 MHz bandwidth in the passband region. In addition to the narrow band gained, miniaturization properties as well as weakened spurious frequency responses and blocked second harmonic frequency in out of band regions have been acquired. Filter parameters including insertion loss, return loss, bandwidth, coupling coefficient and external quality factor have been compared with different values of perturbation dimension (d). Also, a full comparative study of this filter as compared with traditional square patch filter has been considered.
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. (2016). "New compact microstrip patch antennas: Design and Simulation Results", Indian Journal of Science and Technology, Vol. 9, No. 12.
New compact microstrip patch antennas: Design and Simulation Results
(2016) Mezaal, Yaqeen S.
Objectives: To design new multi-band antennas based on patch resonator with comparative results to each other. Both antennas are compact in size and have high quality responses which can be applied in many handheld and personal communication devices. Methods/Analysis: New microstrip patch antennas based on modified first iteration of Minkowski fractal geometry and applying central small square cut in the main resonator have been presented in this paper with and without inserting corner square patches. Both antennas have designed using single layer and dual feeds to operate as multi frequency devices. The antennas have been modeled and optimized by using the Microwave Office (MWO) simulator based on the method of moments. The projected antennas have been designed using FR4 substrate with a relative dielectric constant of 4.4 and a substrate height of 1.6 mm. Compared with the microstrip patch antenna without inserting corner patches using same main patch resonator dimensions and substrate specifications, the designed antenna with corner patches exhibits more operational frequencies as well as as greater frequency ratios with respect to the first fundamental frequency. Findings: New microstrip antennas based on patch resonator with and without inserting corner patches have been proposed. The first antenna exhibits multi-frequency behavior, where resonances appear to take place at frequencies of 2.49, 3.03and 6.63 GHz, within 2 to 7 GHz frequency range. The second antenna exhibits a higher number of resonant frequencies that appear at 2.14, 2.55, 5.03, 5.81, 5.9 and 6.14 GHz respectively under same previous frequency range. The first three operational frequencies have decreased or shifted by inserting corner square patches due to increased electrical physical dimensions of the second antenna. Also, these corner patches act as EM perturbation elements to stimulate the second antenna with more resonant frequencies within 2-7 GHz frequency sweeping range. Theoretically, there is an important relation between antenna dimensions and guided wavelength. This relation specifies if antenna dimension is less than quarter guided wavelength (λg), then the antenna is impractical because radiation resistance, bandwidth and gain are decreased and therefore the antenna size is enlarged. By the way, the dimensions of Antennas 1and 2 have been found to be (0.259 λg × 0.259 λg) and (0.269 λg × 0.269 λg) respectively according to their fundamental frequencies which are satisfactory. Both antennas have small sizes and high quality responses which can be applied in many handheld and personal communication devices. Novelty/Improvement: In this paper, new multi-band antennas based on patch resonator have been proposed. The proposed resonators have been initiated from the transformed version of the first iteration of Minkowski fractal geometry. These antennas have compact dimensions with good return loss and radiation pattern performances which are desired features to be adopted in many communication devices.
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, Yaqeen S.; Hammood, Dalal A., "New Microstrip Quasi Fractal Antennas: Design and Simulation Results", 2016 IEEE 36th International Conference on Electronics and Nanotechnology (ELNANO), pp. 75-78, (2016).
New Microstrip Quasi Fractal Antennas: Design and Simulation Results
(IEEE, 2016) Mezaal, Yaqeen S.; Hammood, Dalal A.
New microstrip antennas based on modified versions of Minkowski-like pre-fractal closed loop resonators have been designed in this study as quasi-fractal devices. Both of them have been designed using single layer substrate and dual via ports to operate as multi frequency antennas. The proposed antennas have compact sizes with good radiation performances, which can be adopted in various wireless applications.
Citation Count: Mezaal, Yaqeen S., "New Microstrip Semi-Fractal Antenna: Design and Simulation Results", 2016 24th Signal Processing and Communication Application Conference (SIU), pp. 1601-1604, (2016).
New Microstrip Semi-Fractal Antenna: Design and Simulation Results
(IEEE, 2016) Mezaal, Yaqeen S.
New microstrip antenna derived from the first iteration of Sierpinski fractal portions has been designed in this study as semi-fractal structure. This antenna has been designed using single layer substrate and dual via ports to operate with resonant frequencies at 2.55, 3.02 and 7.08 GHz within 2 to 8 GHz frequency range. The proposed antenna has miniature dimensions with good radiation performances, which can be integrated in many wireless devices.
Citation Count: Mezaal, Yaqeen S.; Hammood, Dalal A.; Ali, Mohammed H., "OTP Encryption Enhancement Based on Logical Operations", 2016 Sixth International Conference on Digital Information Processing and Communications (ICDIPC), pp. 109-112, (2016).
OTP Encryption Enhancement Based on Logical Operations
(IEEE, 2016) Mezaal, Yaqeen S.; Hammood, Dalal A.; Ali, Mohammed H.
With continuous development of hacking technologies, it is necessary to provide users with a protected background that secures their resources against unlawful access by enforcing control mechanisms. To neutralize such these threats, the enhanced one time pad (OTP) technique has been introduced. Accordingly, to encrypt text, the key is combined with the message. The key length has to have a same length of the message.
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.