Abbas Rezaei

About Abbas Rezaei

Abbas Rezaei, With an exceptional h-index of 20 and a recent h-index of 17 (since 2020), a distinguished researcher at Kermanshah University of Technology, specializes in the field of RF and microwave circuits, Computational intelligence, QCA.

His recent articles reflect a diverse array of research interests and contributions to the field:

An ultra-compact diplexer based on simple microstrip coupled lines for GSM and wideband wireless applications

Thermal investigation and bi-objective optimization of a multi-product system with concentrated solar system

Novel Ultra-Compact Wide Stopband Microstrip Lowpass-Bandpass Triplexer for 5G Multi-Service Wireless Networks

Designing process and analysis of a new SOI-MESFET structure with enhanced DC and RF characteristics for high-frequency and high-power applications

Microstrip lowpass-bandpass triplexer with flat channels and low insertion losses: Design and fabrication for multi-service wireless communication systems

Design and fabrication of a compact branch-line hybrid coupler with a balanced phase using a new microstrip structure for GSM applications

A High-Performance Microstrip Triplexer With Compact Size, Flat Channels and Low Losses for 5G Applications

Design and Optimization of a Compact Microstrip Filtering Coupler With Low Losses and Improved Group Delay for High-Performance RF Communication Systems

Abbas Rezaei Information

University

Kermanshah University of Technology

Position

Iran

Citations(all)

1338

Citations(since 2020)

1062

Cited By

772

hIndex(all)

20

hIndex(since 2020)

17

i10Index(all)

45

i10Index(since 2020)

38

Email

University Profile Page

Kermanshah University of Technology

Abbas Rezaei Skills & Research Interests

RF and microwave circuits

Computational intelligence

QCA

Top articles of Abbas Rezaei

An ultra-compact diplexer based on simple microstrip coupled lines for GSM and wideband wireless applications

Authors

Abbas Rezaei,Salah I Yahya,Leila Nouri

Journal

Wireless Networks

Published Date

2024/2

In this work, a microstrip diplexer with 0.004 λg2 (10.1 × 23 mm) overall size is designed, analyzed and fabricated. The proposed diplexer has the smallest size compared to the previously reported microstrip diplexers. The proposed diplexer has a simple and novel structure, wide flat channels and very low \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\left| {S_{11} } \right|_{dB}$$\end{document}. An innovative microstrip structure based on thin coupled lines is used to design of the proposed diplexer. Since in a simple structure the possibility of manufacturing errors reduces, having a simple structure is one of its advantages. Another advantage of this diplexer is two low \documentclass[12pt …

Thermal investigation and bi-objective optimization of a multi-product system with concentrated solar system

Authors

Muhammad Zeeshan Malik,Salah I. Yahya,Amjad Ali,E. Solomin,Salema K. Hadrawi,Abbas. Rezaei

Journal

International Journal of Hydrogen Energy

Published Date

2023/7/6

The current research is conducted with the aim of investigating a multi-generation energy system (MGS) for electricity, hydrogen, heating, cooling and hot water production using SRC, Kalina cycle and proton exchange membrane (PEM) electrolysis as the main subsystems. The thermodynamic analysis namely energy, exergy, and exergo-economic examination carried out. Analysis for each component is done after thermodynamic modeling. The exergy investigation showed that regenerator 2, vapor generator and condenser had the highest exergy destruction rate, respectively. A comparison was made between the current work and the basic system, and according to the results obtained, the system's ability to produce electricity, cooling, heating and hydrogen are calculated as 782 kW, 173.2 kW, 2265 kW and 0.01613 mol/day, respectively. Also, the energy and exergy efficiency of the proposed system increased …

Novel Ultra-Compact Wide Stopband Microstrip Lowpass-Bandpass Triplexer for 5G Multi-Service Wireless Networks

Authors

Leila Nouri,Farid Zubir,Lewis Nkenyereye,Abbas Rezaei,Mohammed Abdel Hafez,Fawwaz Hazzazi,Muhammad Akmal Chaudhary,Maher Assaad,Zubaida Yusoff

Journal

IEEE Access

Published Date

2024/1/1

This work presents a very compact microstrip lowpass-bandpass (LP-BP) triplexer, which is designed and analyzed based on a novel structure. Due to its complex design process, this type of triplexer is rarely designed. Compared to the previous LP-BP triplexers it has the most compact size of , whereas an LP-BP triplexer with dimensions smaller than has not been designed yet. This triplexer is designed based on a perfect mathematical method and optimization simultaneously. Its lowpass band has a cut-off frequency of 0.67 GHz, suitable for low-band 5G applications. The resonance frequencies of its bandpass channels are located at 2.15 GHz and 3.19 GHz. These bandpass channels make the proposed triplexer appropriate for 5G mid-band applications. This triplexer can suppress the harmonics from the first up to 8th harmonic. The bandpass channels are flat and wide with two fractional …

Designing process and analysis of a new SOI-MESFET structure with enhanced DC and RF characteristics for high-frequency and high-power applications

Authors

Ahmad Ghiasi,Lewis Nkenyereye,Fawwaz Hazzazi,Muhammad Akmal Chaudhary,Maher Assaad,Abbas Rezaei

Journal

PloS one

Published Date

2024/4/26

This research introduces a new designing process and analysis of an innovative Silicon-on-Insulator Metal-Semiconductor Field-Effect (SOI MESFET) structure that demonstrates improved DC and RF characteristics. The design incorporates several modifications to control and reduce the electric field concentration within the channel. These modifications include relocating the transistor channel to sub-regions near the source and drain, adjusting the position of the gate electrode closer to the source, introducing an aluminum layer beneath the channel, and integrating an oxide layer adjacent to the gate. The results show that the AlOx-MESFET configuration exhibits a remarkable increase of 128% in breakdown voltage and 156% in peak power. Furthermore, due to enhanced conductivity and a significant reduction in gate-drain capacitance, there is a notable improvement of 53% in the cut-off frequency and a 28% increase in the maximum oscillation frequency. Additionally, the current gain experiences a boost of 15%. The improved breakdown voltage and peak power make it suitable for applications requiring robust performance under high voltage and power conditions. The increased maximum oscillation frequency and cut-off frequency make it ideal for high-frequency applications where fast signal processing is crucial. Moreover, the enhanced current gain ensures efficient amplification of signals. The introduced SOI MESFET structure with its modifications offers significant improvements in various performance metrics. It provides high oscillation frequency, better breakdown voltage and good cut-off frequency, and current gain compared to the …

Microstrip lowpass-bandpass triplexer with flat channels and low insertion losses: Design and fabrication for multi-service wireless communication systems

Authors

Leila Nouri,Salah I. Yahya,Abbas Rezaei,Fawwaz Hazzaz,Muhammad Akmal Chaudhary,Maher Assaad,B.N. Nhu

Journal

AEU - International Journal of Electronics and Communications

Published Date

2023/7/8

In this work, a new basic microstrip structure is proposed and analyzed to obtain a lowpass-bandpass triplexer without any extra matching networks. This is despite the fact that the number of literature on lowpass-bandpass triplexers that have been introduced so far is very low. The lowpass channel cut-off frequency is tuned at 1.85 GHz which makes it appropriate for mid-band 5G and GSM applications. The bandpass channels work at 3.25 GHz and 6.65 GHz for S-band, 5G, WiMAX and C-band applications. The designed triplexer occupies a compact area of 0.021 λg2. In comparison with the previously reported triplexers, the presented triplexer has three low insertion losses of 0.54 dB, 0.16 dB and 0.55 dB. Also, all its channels are flat with three low group delays of 0.79 ns, 0.98 ns and 0.85 ns. For verifying the designing technique and simulation results, we fabricated and measured our triplexer, where all the …

Design and fabrication of a compact branch-line hybrid coupler with a balanced phase using a new microstrip structure for GSM applications

Authors

Leila Nouri,Salah I Yahya,Abbas Rezaei

Journal

AEU-International Journal of Electronics and Communications

Published Date

2023/3/1

A novel microstrip quadrature hybrid coupler is mathematically designed, optimized and fabricated in this work. The physical structure of the proposed coupler is new and it occupies a very small area of 0.01 λg2. The novel stubs embedded inside the conventional rectangle are connected parallel lines. The ends of these stubs are connected to a solid rectangle, which make the overall structure different from the previous works. Our branch-line coupler is designed to work at 1.8 GHz for GSM applications. The phase imbalance between S21 and S31 is only 0.01°, which is very small compared to the previous works. Another advantage of the presented coupler is its high isolation, which is about 40 dB. Meanwhile, other parameters such as common port return loss and coupling factors are desired. To design this coupler, two low-loss lowpass filters (LPFs) are designed and embedded in the main structure. A …

A High-Performance Microstrip Triplexer With Compact Size, Flat Channels and Low Losses for 5G Applications

Authors

Salah I Yahya,Farid Zubir,Leila Nouri,Abbas Rezaei,Fawwaz Hazzazi,Muhammad Akmal Chaudhary,Maher Assaad,Zubaida Yusoff,BN Nhu

Journal

IEEE Access

Published Date

2023/7/26

A new microstrip triplexer with a compact size of is proposed in this work, where designing a microstrip triplexer with a size less than is a big challenge. In addition to the compact size, it shows a high performance i.e. its channels are wide with low insertion losses. Moreover, the channels are flat with three low group delays (GDs) of 0.65, 0.95 and 1.17 ns, while most of the previously reported triplexers have not considered this important parameter. The proposed resonator is mathematically analyzed to find a method to get rid of harmonics and tune the resonance frequency. Meanwhile, the , , and harmonics are suppressed above the first channel. The designed triplexer is suitable for 5G mid-band applications. The proposed triplexer is exactly fabricated and then measured to confirm the designing method and simulation results. The obtained results show that all the simulation …

Design and Optimization of a Compact Microstrip Filtering Coupler With Low Losses and Improved Group Delay for High-Performance RF Communication Systems

Authors

Salah I Yahya,Farid Zubir,Leila Nouri,Zubaida Yusoff,Fawwaz Hazzazi,Muhammad Akmal Chaudhary,Maher Assaad,Abbas Rezaei,Binh Nguyen Le

Journal

IEEE Access

Published Date

2023/9/20

In this paper, a compact filtering coupler is presented using a new microstrip configuration. To improve the frequency response, achieve good phase balance and reduce the losses of the proposed coupler, an optimization method is used along with a mathematical analysis method. Our coupler works at 1.9 GHz, which is suitable for 5G and GSM applications. The working frequency range of our designed coupler is from 1.84 GHz to 2.11 GHz, where it has a fractional bandwidth (FBW) of 13.7%. The phase and magnitude imbalances are only and 0.08 dB, respectively, making it suitable for applications in microwave components, communication and radar systems. The maximum group delays at the direct and coupling ports are 1.9 ns and 2.3 ns, respectively. This is an advantage because most of the previously reported microstrip couplers have not addressed the group delay improvement. The other …

A Comprehensive Review on Microstrip Couplers

Authors

Abbas Rezaei,Salah I Yahya,Leila Nouri

Published Date

2023/1/15

In this work, several types of microstrip couplers are investigated in terms of structure, performance and design methods. These planar 4-ports passive devices transmit a signal through two different channels. Designers' competition has always been in miniaturizing and improving performance of couplers. Some couplers have been offered with a novel structure, which is a special feature. A high-performance coupler should have high isolation and low losses at both channels. The channels are usually overlapped so that the common port return loss in these channels should be low. Among the couplers, those with balanced amplitude and phase are more popular. The popular mathematical analysis methods are even/odd mode analysis, extracting the information from the ABCD matrix and analyzing the equivalent LC circuit of a simple resonator. According to the phase shift value, couplers are classified as 90º and correct multiples of 90º, where a microstrip 0º coupler can be used as a power divider. Some couplers have filtering and harmonic elimination features that are superior to other couplers. However, few designers paid attention to suppressing the harmonics. If the operating frequency is set in according to the type of application, the coupler becomes particularly valuable. ABCD Matrix

A novel configuration of microstrip coupler with low loss and suppressed harmonics

Authors

Leila Nouri,Salah I. Yahya,Abbas Rezaei,Muhammad Akmal Chaudhary,B.N. Nhu

Journal

AEU-International Journal of Electronics and Communications

Published Date

2023/4/6

This work presents a novel structure to design a microstrip coupler. The best values of S21 and S31 are 0.65 dB and 0.83 dB, respectively, in the passband of the proposed coupler. Another significant advantage of this coupler is its filtering frequency response, where it can suppress the harmonics below the passband from DC and above the passband, from 1st up to 7th harmonics. The phase difference between S21 and S31 is 90°±0.1°, which indicates a high phase balance. Beside these features, a compact size of 0.01 λg2 is achieved using the proposed novel configuration of the microstrip coupler. A perfect mathematical design method is introduced to show how the insertion loss (IL) can be reduced. Two BPFs are designed, analyzed and placed in the coupler structure. Finally, the designed coupler is fabricated and measured to verify the simulation results, where the experimental results are close to the …

Design and analysis of a compact microstrip lowpass–bandpass diplexer with good performance for wireless applications

Authors

Abbas Rezaei,Salah I Yahya,Leila Nouri

Journal

International Journal of Microwave and Wireless Technologies

Published Date

2023/9

This paper presents the design of a novel lowpass–bandpass diplexer with compact size and good performance using microstrip cells. For this purpose, two microstrip lowpass and bandpass filters are separately designed and mathematically analyzed. The proposed microstrip diplexer has a novel and simple structure. It occupies a compact area of 0.037 λg2 (722 mm2), and its insertion loss and S11 at both channels are low. The insertion loss at the lower and upper channels is only 0.047 and 0.16 dB, respectively. Meanwhile, both channels are flat with the maximum group delay of 1.68 ns which is the lowest compared to the previously reported diplexers mentioned in this paper. To design the proposed diplexer, first, a lowpass diplexer with good performance is designed which has low losses and a good figure of merit. It has a flat passband with a sharp roll-off. Then, to achieve the proposed diplexer, a bandpass …

A high‐performance microstrip bandpass filtering coupler with low‐loss and compact size

Authors

Abbas Rezaei,Salah I Yahya,Leila Nouri

Journal

Microwave and Optical Technology Letters

Published Date

2023

In this letter, novel spiral‐coupled transmission lines are used to obtain a high‐performance microstrip coupler. The advantages of the proposed microstrip coupler are novel structure, filtering frequency response, suppressed harmonics up to second harmonics, transmission poles, low losses, compact size, and good phase balance. The proposed structure is novel and different from the previous coupler designs such as rate‐races, rings, and branch‐lines types. It is presented for the first time in this work with a very small size and good performance. The size of this coupler is only 82.6 mm2 (0.004 λg2). The common port return loss is 33 dB and the insertion losses at port 2 and port 3 are 2.2 and 2.7 dB, respectively. To prove the accuracy of the design method and simulation results, the proposed coupler is fabricated and measured where the measurement results confirm the simulation results and the proposed …

A super-efficient GSM triplexer for 5G-enabled IoT in sustainable smart grid edge computing and the metaverse

Authors

Mohammad (Behdad) Jamshidi,Salah I. Yahya,Liela Nouri,Hamed Hashemi-Dezaki,Abbas Rezaei,Muhammad Akmal Chaudhary

Journal

Sensors

Published Date

2023/4/6

Global concerns regarding environmental preservation and energy sustainability have emerged due to the various impacts of constantly increasing energy demands and climate changes. With advancements in smart grid, edge computing, and Metaverse-based technologies, it has become apparent that conventional private power networks are insufficient to meet the demanding requirements of industrial applications. The unique capabilities of 5G, such as numerous connections, high reliability, low latency, and large bandwidth, make it an excellent choice for smart grid services. The 5G network industry will heavily rely on the Internet of Things (IoT) to progress, which will act as a catalyst for the development of the future smart grid. This comprehensive platform will not only include communication infrastructure for smart grid edge computing, but also Metaverse platforms. Therefore, optimizing the IoT is crucial to achieve a sustainable edge computing network. This paper presents the design, fabrication, and evaluation of a super-efficient GSM triplexer for 5G-enabled IoT in sustainable smart grid edge computing and the Metaverse. This component is intended to operate at 0.815/1.58/2.65 GHz for 5G applications. The physical layout of our triplexer is new, and it is presented for the first time in this work. The overall size of our triplexer is only 0.007 λg2, which is the smallest compared to the previous works. The proposed triplexer has very low insertion losses of 0.12 dB, 0.09 dB, and 0.42 dB at the first, second, and third channels, respectively. We achieved the minimum insertion losses compared to previous triplexers. Additionally, the common port …

A Compact Negative Group Delay Microstrip Diplexer with Low Losses for 5G Applications

Authors

Leila Nouri,Salah I Yahya,Abbas Rezaei,Fawwaz A Hazzazi,Binh N Nhu

Journal

ARO-THE SCIENTIFIC JOURNAL OF KOYA UNIVERSITY

Published Date

2023/8/25

Microstrip Diplexers play an important role in modern wireless communication systems. In this paper, a novel compact microstrip diplexer based on spiral cells is presented. The proposed resonator primarily consists of two spiral thin lines connected to a pair of coupled lines. This novel resonator is analyzed mathematically to find its behavior and tune the dimensions of the final layout easily. Using the analyzed resonator, two bandpass filters (BPFs) are designed. Then, a novel high-performance microstrip diplexer is obtained by designing and integrating these two BPFs. The center frequencies of the first and second channels of the proposed diplexer are 1.86 GHz and 4.62 GHz, respectively. The proposed diplexer boasts a remarkably small size of 0.004 λ g 2 and features flat channels with low insertion losses of only 0.048 dB and 0.065 dB for the first and second channels, respectively. The maximum group delays of S 21 and S 31 are 0.31 ns, 0.86 ns, respectively, which are good values for a modern communication system. Meanwhile, inside its passbands for some frequency ranges, its group delays are negative. Thus, using this diplexer can decrease the signal dispersion. The 1 st and 2 nd passbands are wide with 47.3% and 47.1% fractional bandwidths (FBW), respectively. Therefore, this diplexer can be easily and successfully used in designing high-performance RF communication systems.

A new compact and low phase imbalance microstrip coupler for 5G wireless communication systems

Authors

Salah I. Yahya,Farid Zubir,Leila Nouri,Zubaida Yusoff,Muhammad Akmal Chaudhary,Maher Assaad,Abbas Rezaei,Binh Nguyen Le

Journal

Plos one

Published Date

2023/12/22

Microstrip couplers play a crucial role in signal processing and transmission in various applications, including RF and wireless communication, radar systems, and satellites. In this work, a novel microstrip 180° coupler is designed, fabricated and measured. The layout configuration of this coupler is completely new and different from the previously reported Rat-race, branch-line and directional couplers. To obtain the proposed coupler, the meandrous coupled lines are used and analyzed mathematically. To improve the performance of our coupler, an optimization method is used. The designed coupler is very compact with an overall size of 0.014λg2. The obtained values of S21 and S31 are -3.45 dB and -3.75 dB, respectively at the operating frequency, while the fractional bandwidth (FBW) is 56.2%. It operates at fo = 1.61 GHz (suitable for 5G applications) and can suppress harmonics up to 2.17fo. Another advantage of this coupler is its low phase imbalance, while the phase difference between S21 and S31 is 180°± 0.023°. Therefore, our device is a balanced coupler with ±0.3 dB magnitude unbalance at its operating frequency. It is important to note that it is very difficult to find a coupler that has all these advantages at the same time. The proposed 180° coupler is fabricated and measured. The comparison shows that the measurement and simulation results are in good agreement. Therefore, the proposed coupler can be easily used in designing high-performance 5G communication systems.

Multiplierless low‐cost implementation of Hindmarsh–Rose neuron model in case of large‐scale realization

Authors

Saeed Haghiri,Salah I Yahya,Abbas Rezaei,Arash Ahmadi

Journal

International Journal of Circuit Theory and Applications

Published Date

2023

Implementation of neural networks in case of hardware helps us to understand the different parts of the human brain operation, using artificial intelligence (AI). This paper presents a new model of the Hindmarsh–Rose (HR) Neuron that is based on basic polynomial functions called Nyquist‐look up table‐Hindmarsh–Rose (N‐LUT‐HR) based on an accurate sampling of the original model. The proposed approach is investigated in terms of its digital realization feasibility. According to high matching between the original and proposed terms, it is showed that the new modified model can follow all spiking patterns of primary model with low‐error computations. In hardware case, the proposed and original models are implemented on Xilinx FPGA XC2VP30 chip to validate different aspects of the simulation results. Hardware results demonstrate that our model regenerates the desired patterns in low‐cost and high …

A high-efficiency diplexer for sustainable 5G-enabled IOT in metaverse transportation system and smart grids

Authors

Mohammad (Behdad) Jamshidi,Salah I. Yahya,Leila Nouri,Hamed Hashemi-Dezaki,Abbas Rezaei,Muhammad Akmal Chaudhary

Journal

Symmetry

Published Date

2023/3/29

Symmetry is essential in the design of complex systems like the Metaverse Transportation Sys-tem (MTS) and helps ensure that all components work together effectively. In the development of a microstrip diplexer for 5G-enabled IoT and MTS, maintaining symmetry is crucial to achieving flat responses with low group delays. By integrating transportation technology and the Metaverse, the Metaverse Transportation System (MTS) can greatly improve the effectiveness and intellect of transportation systems in reality. To establish a dependable network, it is essential to include 5G-enabled Internet of Things (IoT) and sensor networks with a sustainable design that focuses on efficiency and energy conservation. A three-channel microstrip lowpass-bandpass diplexer has been developed for 5G-enabled IoT and MTS implementation. Multi-channel designs are rare due to the complex design process, but this diplexer is very compact at only 0.004 λg2. All channels have flat responses with group delays of 0.34 ns, 1.7 ns, and 0.34 ns at the lower, middle, and upper passbands, respectively. The lowpass channel has a cut-off frequency of 1.22 GHz, suitable for mid-band 5G applications. Compared to previous work, this diplexer achieves the smallest size, lowest group delay, and insertion and return losses at the lower channel. It consists of a lowpass-bandpass section connected to a band-pass filter analyzed mathematically, and its performance has been verified through simulation and measurement with good accuracy.

A Balanced Symmetrical Branch-Line Microstrip Coupler for 5G Applications

Authors

Salah I. Yahya,Farid Zubir,Leila Nouri,Fawwaz Hazzazi,Zubaida Yusoff,Muhammad Akmal Chaudhary,Maher Assaad,Abbas Rezaei,Binh Nguyen Le

Journal

Symmetry

Published Date

2023/8/17

Symmetry in designing a microstrip coupler is crucial because it ensures balanced power division and minimizes unwanted coupling between the coupled lines. In this paper, a filtering branch-line coupler (BLC) with a simple symmetrical microstrip structure was designed, analyzed and fabricated. Based on a mathematical design procedure, the operating frequency was set at 5.2 GHz for WLAN and 5G applications. Moreover, an optimization method was used to improve the performance of the proposed design. It occupied an area of 83.2 mm2. Its harmonics were suppressed up to 15.5 GHz with a maximum level of −15 dB. Meanwhile, the isolation was better than −28 dB. Another advantage of this design was its high phase balance, where the phase difference between its output ports was 270° ± 0.1°. To verify the design method and simulation results, the proposed coupler was fabricated and measured. The results show that all the simulation, design methods, and experimental results are in good agreement. Therefore, the proposed design can be easily used in designing high-performance microstrip-based communication systems.

Improved SOI-MESFET structures for enhanced efficiency and optimized DC/RF characteristics

Authors

Ahmad Ghiasi,Salah I Yahya,Abbas Rezaei

Journal

International Journal of Electronics

Published Date

2023/10/16

In this paper, two new silicon on insulator metal-semiconductor field effect transistor (SOI-MESFET) structures are presented. Two parallel layers of oxide and aluminium are added at the gate edge of these structures. Also, in the buried oxide part of the Aluminium Edge and Silicon-Well MESFET (AESW-MESFET) structure, a silicon well and two aluminium layers are added. Moreover, and to improve the DC and RF characteristics, as compared to the Conventional MESFET (C-MESFET) structure, a silicon well and a silicon layer are added in the box oxide section in the Silicon Edge and Silicon-Well MESFET (SESW-MESFET) structure. By these changes, the value of the breakdown voltage in the normal structure has increased from 15.8 V to 33.1 V and 30.9 V in the proposed AESW-MESFET and SESW-MESFET structures, respectively. In addition, the maximum output power has been associated with a …

A Dynamic recurrent neural network for predicting higher heating value of biomass

Authors

Babak Aghel,Salah I Yahya,Abbas Rezaei,Falah Alobaid

Journal

International Journal of Molecular Sciences

Published Date

2023/3/17

The higher heating value (HHV) is the main property showing the energy amount of biomass samples. Several linear correlations based on either the proximate or the ultimate analysis have already been proposed for predicting biomass HHV. Since the HHV relationship with the proximate and ultimate analyses is not linear, nonlinear models might be a better alternative. Accordingly, this study employed the Elman recurrent neural network (ENN) to anticipate the HHV of different biomass samples from both the ultimate and proximate compositional analyses as the model inputs. The number of hidden neurons and the training algorithm were determined in such a way that the ENN model showed the highest prediction and generalization accuracy. The single hidden layer ENN with only four nodes, trained by the Levenberg–Marquardt algorithm, was identified as the most accurate model. The proposed ENN exhibited reliable prediction and generalization performance for estimating 532 experimental HHVs with a low mean absolute error of 0.67 and a mean square error of 0.96. In addition, the proposed ENN model provides a ground to clearly understand the dependency of the HHV on the fixed carbon, volatile matter, ash, carbon, hydrogen, nitrogen, oxygen, and sulfur content of biomass feedstocks.

See List of Professors in Abbas Rezaei University(Kermanshah University of Technology)

Abbas Rezaei FAQs

What is Abbas Rezaei's h-index at Kermanshah University of Technology?

The h-index of Abbas Rezaei has been 17 since 2020 and 20 in total.

What are Abbas Rezaei's top articles?

The articles with the titles of

An ultra-compact diplexer based on simple microstrip coupled lines for GSM and wideband wireless applications

Thermal investigation and bi-objective optimization of a multi-product system with concentrated solar system

Novel Ultra-Compact Wide Stopband Microstrip Lowpass-Bandpass Triplexer for 5G Multi-Service Wireless Networks

Designing process and analysis of a new SOI-MESFET structure with enhanced DC and RF characteristics for high-frequency and high-power applications

Microstrip lowpass-bandpass triplexer with flat channels and low insertion losses: Design and fabrication for multi-service wireless communication systems

Design and fabrication of a compact branch-line hybrid coupler with a balanced phase using a new microstrip structure for GSM applications

A High-Performance Microstrip Triplexer With Compact Size, Flat Channels and Low Losses for 5G Applications

Design and Optimization of a Compact Microstrip Filtering Coupler With Low Losses and Improved Group Delay for High-Performance RF Communication Systems

...

are the top articles of Abbas Rezaei at Kermanshah University of Technology.

What are Abbas Rezaei's research interests?

The research interests of Abbas Rezaei are: RF and microwave circuits, Computational intelligence, QCA

What is Abbas Rezaei's total number of citations?

Abbas Rezaei has 1,338 citations in total.

What are the co-authors of Abbas Rezaei?

The co-authors of Abbas Rezaei are Shoaib Khanmohammadi, Babak Aghel, Majid Mohadesi, sohrab majidifar.

    Co-Authors

    H-index: 33
    Shoaib Khanmohammadi

    Shoaib Khanmohammadi

    Kermanshah University of Technology

    H-index: 27
    Babak Aghel

    Babak Aghel

    Kermanshah University of Technology

    H-index: 21
    Majid Mohadesi

    Majid Mohadesi

    Kermanshah University of Technology

    H-index: 10
    sohrab majidifar

    sohrab majidifar

    Kermanshah University of Technology

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