Saeed Roshani

Saeed Roshani
Islamic Azad University Kermanshah Branch · Department of Electrical Engineering

Associate professor

About

79
Publications
15,169
Reads
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1,318
Citations
Citations since 2017
69 Research Items
1298 Citations
20172018201920202021202220230100200300400500
20172018201920202021202220230100200300400500
20172018201920202021202220230100200300400500
20172018201920202021202220230100200300400500
Education
August 2014 - February 2015
Amirkabir University of Technology
Field of study
  • Electrical Engineering
September 2011 - February 2015
Razi University
Field of study
  • Electrical Engineering
September 2008 - June 2010
Shahed University
Field of study
  • Electrical Engineering

Publications

Publications (79)
Article
Full-text available
In this paper, new LC lumped components and composite lines are used to create a filtering branch line coupler (FBLC) with a small size and wide suppression band. New composite lines are proposed using applied LC lumped components, which are used as the coupler main branches. The proposed FBLC suppresses second to sixth harmonics with high attentio...
Article
Full-text available
This paper presents a new approach to simplify the design of class-E power amplifier (PA) using hybrid artificial neural-optimization network modeling. The class-E PA is designed for wireless power transfer (WPT) applications to be used in biomedical or internet of things (IoT) devices. Artificial neural network (ANN) models are combined with optim...
Article
Full-text available
This paper proposes an ultra-compact filtering power divider with a wide harmonic suppression band. In this design, the proposed power divider (PD) in the ideal case has 100% size reduction and an infinite number of harmonics suppression. However, in the real case, the proposed divider has a 92% size reduction and suppresses the 2nd to 45th harmoni...
Article
Full-text available
A power divider (PD) with a wide stopband and simple symmetric structure using open- and short-ended stubs is analyzed and implemented in this paper. In the proposed power divider, for the first time, the output resistor is divided into two sections and open- and short-ended stubs are used between the resistors. The incorporated open- and short-end...
Article
In microstrip branch line coupler (BLC) design, there are significant parameters, including size reduction, insertion loss, and harmonic suppression, which affect the performances of the device. In this paper, a modified BLC with compact size, wide harmonics suppression band, and low insertion loss in operating band is designed. In the proposed des...
Article
Full-text available
Photonic crystals are periodic structures made of insulators. They are the best option to design biosensors. In this paper, a photonic crystal biosensor containing insulation rods in the air was designed and simulated. This biosensor was used as a photonic crystal circular nano-ring between the internal and external waveguides. At the end of the in...
Article
Full-text available
A new design of a 1:2 and 1:4 microstrip power divider is proposed using finite defected ground structure (FDGS), in this paper. In order to design the presented divider, Wilkinson and Gysel power divider are used simultaneously. T-shaped and L-Shaped resonators are applied to decrease the circuit size and suppress eliminate unwanted harmonics. Mor...
Article
Full-text available
This paper presents the design, analysis, and fabrication of a new miniaturized microstrip branch line coupler (BLC) with high harmonics suppression. The T-shaped resonators, open stubs cross-shaped resonators and radial stubs are used in the proposed coupler design. The designed BLC operates at 1 GHz frequency, which can suppress up to 5th spuriou...
Article
Full-text available
The spread of SARS-CoV-2 can be considered one of the most complicated patterns with a large number of uncertainties and nonlinearities. Therefore, analysis and prediction of the distribution of this virus are one of the most challenging problems, affecting the planning and managing of its impacts. Although different vaccines and drugs have been pr...
Article
Full-text available
Complex phenomena have some common characteristics, such as nonlinearity, complexity, and uncertainty. In these phenomena, components typically interact with each other and a part of the system may affect other parts or vice versa. Accordingly, the human brain, the Earth’s global climate, the spreading of viruses, the economic organizations, and so...
Preprint
Full-text available
Photonic crystals are periodic structures made of insulators. They are the best option to design biosensors. In this paper, a photonic crystal biosensor containing insulation rods in the air was designed and simulated. This biosensor was used as a photonic crystal circular nano-ring between the internal and external waveguides. At the end of the in...
Article
Full-text available
The branch-line coupler (BLC) is an important device in radio frequency (RF) and microwave (MW) circuits. The main drawbacks of the conventional BLC are as follows: first, the four long quarter-wavelength (λ/4) transmission line sections occupy a large size, especially at the low frequencies, and second, the presence of unwanted harmonics. This res...
Article
Full-text available
The paper introduces a novel structure of a dual-band filtering Wilkinson power divider (WPD). Its essential component is a dual-band bandpass filter (BPF), implemented using coupling lines and two T-shaped resonators. The BPF is incorporated into the divider structure to suppress the unwanted harmonics within the circuit. The latter is achieved ow...
Article
In this paper, a compact branch microstrip coupler with the simple structure using T-shaped resonators and open-ended stubs at 1.8 GHz is designed and fabricated. The proposed coupler creates two transmission zeros at 3.4 and 3.87 GHz, with more than 50 dB attenuation level, which resulted in a good harmonic suppression at 2nd harmonic. Artificial...
Article
Full-text available
This paper introduces a simple H-shaped patch Wilkinson power divider (WPD), which provides ultra wide harmonics suppression band. The presented WPD designed at 1.8 GHz, and exhibits good performance at the operating bandwidth. In the proposed divider structure, two simple patch low-pass filters (LPFs) are employed at each branch, and three open en...
Article
Full-text available
In this paper, a lowpass filter is designed using half elliptical resonators with a wide stopband. New formulas are presented to achieve a circuit model for the half elliptical resonators used in this work. Additionally, the transfer function and transmission zero equations are used to adjust the frequency of the transmission zeros of the filter. T...
Preprint
Full-text available
COVID-19 is by now one of the deadliest public health issues that as per the last announcement of the World Health Organization up to January 21, 2021, has infected more than 108,904,983 people and claimed more than 2,398,339 lives worldwide. Although different vaccines have proved and distributed one after another, several new mutated viruses have...
Article
Full-text available
This paper presents an elegant yet straightforward design procedure for a compact rat-race coupler (RRC) with an extended harmonic suppression. The coupler’s conventional λ/4 transmission lines (TLs) are replaced by a specialized TL that offers significant size reduction and harmonic elimination capabilities in the proposed approach. The design pro...
Article
This paper presents a new Doherty power amplifier (DPA) with harmonics suppression. A Wilkinson power divider (WPD) with open-ended and short-ended stubs is designed to suppress unwanted signals. To design the power divider in the circuit of the DPA, even and odd mode analyses are utilized. The proposed design operates at range of 1.2–1.6 GHz. The...
Preprint
Full-text available
In this paper a novel ladder resonator is introduced to decrease mutual coupling effect between two microstrip patch antennas. Applied patch antennas are operating at 2.45 GHz frequency (ISM band), which specially used for multiple-input–multiple-output (MIMO) systems. The edge-to-edge distance between two microstrip patch antennas is 0.05 λ. The p...
Article
Full-text available
In the design of a microstrip power divider, there are some important factors, including harmonic suppression, insertion loss, and size reduction, which affect the quality of the final product. Thus improving each of these factors contributes to a more efficient design. In this respect, a hybrid technique to reduce the size and improve the performa...
Article
Full-text available
In this paper, a novel miniaturized microstrip Wilkinson power divider (WPD) using squared resonators and open-ended stubs is designed, fabricated, and measured. The proposed divider is designed at 1.9 GHz, which suppresses 2nd, 3rd, and 4th harmonics with high attenuation levels. Moreover, the size of the proposed divider is only 0.1 λ g × 0.07 λ...
Article
In this paper a compact lowpass-dual bandpass microstrip diplexer is designed, simulated and measured. The presented diplexer consists of a low pass filter (LPF) and a dual-band, band pass filters (BPFs). The main contribution of this work is that a new structure for diplexer is proposed by using T-shaped resonator, ring resonator and meandered lin...
Chapter
Full-text available
production of the medicine for COVID-19 based on Deep Learning (DL) methods. The proposed platforms are able to be used as predictors to forecast antigens during the infection disregarding their abundance and immunogenicity with no requirement of growing the pathogen in vitro. First, we briefly survey the latest achievements and fundamentals of som...
Article
Full-text available
In this article, a miniaturized and harmonics suppressed Wilkinson power divider (WPD) is analytically designed. In the proposed divider composite transmission lines and resonator cells are utilized to eliminate unwanted harmonics and reduce circuit size. This structure has a 52% size reduction, compared to the typical WPD. According to the measure...
Article
In this paper, an UWB down-conversion mixer is presented with high 3rd order linearity. The UWB bandwidth of the mixer can be achieved in 0.9-5 GHz by using a cascode structure with four capacitors. These capacitors are used to make a feedback network for IM3 cancellation in transconductance stage of active double-balanced Gilbert mixer cell. By us...
Article
Full-text available
In this paper, a compact microstrip Wilkinson power divider is designed and proposed using rectangularshaped resonator cells. The presented resonator cells are used instead of quarter-wave length branches in the traditional structure to reduce the circuit size, increase the bandwidth, and eliminate the unwanted harmonics. The designed resonator beh...
Article
Full-text available
In this paper, a novel branch-line coupler using meandered line compact microstrip resonant cell (MLCMRC) and bended lines is proposed. The presented coupler works at 0.9 GHz, with good specifications. The measured values of S12 and S13 at 0.9 GHz are 3.2 dB and 3.3 dB, respectively, which show better than 0.3 dB insertion loss in the pass band. Th...
Article
In this paper, a lowpass – bandpass dual band microwave filter is designed by using deep learning and artificial intelligence. The designed filter has compact size and desirable pass bands. In the proposed filter, the resonators with Z-shaped and T-shaped lines are used to design the low pass channel, while coupling lines, stepped impedance resonat...
Conference Paper
An Intelligent Transportation System (ITS) is a modern technology aiming to improve traffic management and modes of transport. The Long-Term Evolution (LTE) standard is a suitable protocol for wireless communication systems in new ITS applications due to its high speed capacity. In this paper, a novel H-shaped filtering Wilkinson Power Divider (WPD...
Preprint
Full-text available
A hybrid approach to improving the structures of microstrip devices is presented in this study. The proposed technique includes a combination of simple series inductor (L) and capacitor (C) circuits with microstrip-based structures and transmission lines. In this method, the LC circuits are replaced with those parts of the microstrip components tha...
Conference Paper
In this paper, an efficient Class-F power amplifier (PA) is designed, simulated and modeled. This type of amplifier has nonlinear behaviors and uses tuning and controlling harmonics as the most important mechanism to increase efficiency. Feedforward artificial neural network (ANN) model is proposed to predict and estimate the nonlinear output of th...
Conference Paper
In this paper a compact low pass filter (LPF) with desirable figure of merit (FOM) and sharp roll-off is designed. The cutoff frequency of the designed filter is 3 GHz. The designed filter has a sharp transition-band of 0.88 GHz, from 3 to 3.88 GHz with corresponding attenuation levels of-3 and-60 dB, respectively. Also, the proposed filter has wid...
Article
Full-text available
A novel balanced power amplifier (BPA) using compact coupler with rhombus resonators is presented. In this design, a new method is presented to analyze the proposed rhombus‐shaped resonator based on the LC equivalent circuit. A new class F power amplifier is designed to improve performances of the BPA. The results show that the performance of the p...
Article
Full-text available
COVID-19 outbreak has put the whole world in an unprecedented difficult situation bringing life around the world to a frightening halt and claiming thousands of lives. Due to COVID-19’s spread in 212 countries and territories and increasing numbers of infected cases and death tolls mounting to 5,212,172 and 334,915 (as of May 22 2020), it remains a...
Article
Full-text available
In this paper, a new Wilkinson Power Divider ‎‎(WPD) using open and short stubs is proposed. ‎Open and short stubs are utilized instead of 1/4 wave transmission lines in initial ‎structure to achieve harmonics suppression. The proposed WPD is designed for ‎operational frequency of 0.9 GHz and creates 3 transmission ‎zeros at 1.8 GHz, 2.7 GHz and 3....
Article
A novel Doherty power amplifier (DPA) using a novel power divider with harmonics suppression and size reduction is proposed. The designed power divider suppresses eight unwanted harmonics. Moreover, the proposed divider reduces the circuit size and only occupies 41% in comparison with conventional divider. In the DPA structure two elliptical resona...
Article
Full-text available
In this paper a miniaturized low pass filter (LPF) with 2.5 GHz cut-off frequency and a novel compact, harmonics suppressed Wilkinson power divider (WPD) at 0.7 GHz is proposed. The proposed divider consists of two multi-stub LPFs and three open stubs at each port. The presented open stub at port one suppresses the second harmonic and other two ope...
Article
In this paper, a new method to decrease the dimensions of the microstrip structures and reducing the overall size of the class F amplifiers is presented. First, by using the PHEMT transistor with a conventional harmonic control circuit (HCC), a low-voltage class F amplifier in the L band frequency at the operating frequency of 1.75 GHz is introduce...
Article
Full-text available
In this study, a miniaturized microstrip Wilkinson power divider (WPD) with harmonic elimination using low pass filter is proposed. In proposed design, two large conventional quarter wavelength transmission lines are replaced with compact low pass filters. Applied low pass filters are consisted of three triangle resonators, which result in harmonic...
Article
In this paper, design process of a new compact microstrip Gysel power divider (GPD) with harmonics elimination is proposed. In the designed GPD structure, two types of resonators are applied to make transmission zeros (TZs). T-shaped resonator makes one TZ at lower frequency and U-shaped resonator makes two TZs at higher frequencies. These three cr...
Article
Full-text available
An ultra-sharp microstrip composite low-pass filter (LPF) with proper structure using analytical method is proposed. A composite LPF using image parameter method and lumped elements is designed is this paper. Then, quasi-lumped elements, such as: open-stub lines, high and low impedance lines and standard microstrip equations are utilized to microst...
Article
In this paper, a modified class-F power amplifier is designed and implemented with new method at 900 MHz frequency. The meandered line compact microstrip resonant cell (MLCMRC), with simple structure is proposed to use as a harmonic control circuit (HCC). The proposed MLCMRC correctly acts as open-circuit at third and fifth harmonics and acts as sh...
Article
In this paper a new lowpass filter (LPF) with curved line resonators and fountain shaped resonators is proposed. The proposed filter has achieved wide stopband, compact size, sharp roll-off rate and low return loss. Two tapered resonators are used to produce transmission zeros and widen the stopband. Also, a fountain shaped resonator is proposed us...
Conference Paper
Before launching satellites into space, a wide variety of practical and comprehensive tests must be done on their different subsystems. Because, the cost spent for designing and manufacturing satellites is much higher than these investigations. One of the prominent sectors of these devices is their power supplies. In this paper, a neuro-fuzzy based...
Article
In this paper, an ultra wide band-low noise amplifier (UWB-LNA)is presented using two new noise cancellation and bandwidth enhancement techniques. The noise cancellation technique was performed using two additional transistors to a common-gate differential amplifier, while the presented amplifier provides a new concept of series inductors to increa...
Conference Paper
Using the computational inelegant methods in processing financial data is a practicable action to reduce a wide variety of crime in this domain. In this paper, a new intelligent multiobjective to recognize money laundering in banks and currency exchanges is presented. The introduced approach is based on Adaptive Neuro-Fuzzy Inference System (ANFIS)...
Article
Full-text available
In this paper, a modified 1 GHz Wilkinson power divider with ultra harmonics suppression is proposed. In the presented divider, three open stubs are used at three ports of divider and two compact low-pass filters are used as quarter-wavelength transmission lines paths. The proposed divider shows excellent specifications and suppresses significant n...
Article
Gamma-ray densitometry is widely implemented in oil industry because it is an online technique and also has a good precision. If there is single phase flow in oil pipelines, measuring the density is possible just by using one source and one detector. But if in addition to oil, there is gas in oil pipelines and in fact there is a two-phase flow, con...
Article
In this paper a new miniaturized bandpass-bandpass diplexer with sharp pass-band is designed and fabricated. The proposed diplexer includes two bandpass filters with sharp pass-bands. Coupling lines and stepped impedance resonators are used to form each bandpass filter. In this paper, two filters are designed in the schematic circuit mode, and then...
Article
In this paper, a modified class-F power-amplifier (PA) for GSM applications is designed, simulated and tested. In this design, novel symmetrical meandered lines compact microstrip resonant cell (SMLCMRC), is proposed as a new harmonics control circuit (HCC), which resulted in size compression, power added efficiency (PAE) enhancement, power gain im...
Article
A microstrip lowpass filter (LPF) with very small dimensions and an extremely wide rejection band has a cutoff frequency (fc) of 1.89 GHz and suppresses the second to 34th harmonics (2.38 to 65 GHz) by greater than than 24 dB. The filter's simple topology consists of a symmetrical modified T-shaped resonator, a symmetrical modified flag-shaped (SMF...
Article
A miniaturized lowpass filter (LPF) with ultrasharp response, good figure of merit (FOM), and simple structure is proposed. The designed structure is fabricated and measured with a 2.9 GHz cut-off frequency. The proposed LPF consists of high impedance lines that are loaded by three similar resonators and two uniform suppressing cells. The filter si...
Article
A compact 1.5 GHz microstrip branch-line coupler with harmonic suppression, using low-pass resonators and meandered lines open stubs, is designed and fabricated in this paper. Both significant size reduction and harmonics suppression are achieved in the proposed structure using U-shape low-pass resonators and meandered lines open stubs. The propose...
Article
A miniaturized dual band Wilkinson power divider (WPD) with an ultra wideband harmonic suppression is proposed, in this paper. Capacitor loaded transmission lines (CLTL) are used in the proposed circuit. The proposed WPD has a significant size reduction more than 80% compared to a primary power divider. In the design procedure, values of the impeda...
Article
Full-text available
A microstrip low-pass filter using T-shaped resonators is designed to achieve an ultra-sharp transition band and high suppression level. The performance of the resonators is investigated based on an LC equivalent circuit and a transfer function to compute the equations of the transmission zeros. This filter has an acceptable stopband with high inse...
Article
A compact two-way unequal Wilkinson power divider with a power division ratio of 2 is proposed. The proposed design can reduce more than 75% of the occupied area, compared with the conventional unequal power divider using composite transmission line. In the proposed design, the total transmission-line length is much less than conventional one. A re...
Article
Full-text available
In this paper, a new topology of the class E power amplifier (PA) is proposed . The output circuit in the proposed power amplifier is different from that in the conventional class E PA. The conventional output circuit of class E power amplifier consists of shunt capacitor, resonant capacitor, resonant inductor, and shifting inductor. An additional...
Article
Full-text available
In this paper, a miniaturized microstrip low-pass filter (LPF) with sharp transition-band, wide stop-band and negligible insertion-loss in pass-band is proposed using semicircle and butterfly resonators. The cutoff frequency of the proposed LPF is 1.75 GHz. The proposed LPF presents a wide stop-band from 2.1 to 23.73 GHz (2 nd-14 th harmonics) with...
Conference Paper
Full-text available
In this letter, a microstrip low pass filter with wide stopband using T-shaped resonators is designed. The proposed low pass filter using ADS software is simulated. The filter consists of 7 pairs of symmetrical T-shaped resonators. The 3-dB cutoff frequency is 5.562 GHz, applicable for C-band spectrum. The transition-band is sharp (30 dB/GHz).The s...
Conference Paper
Full-text available
A microstrip bandpass filter (BPF) with compact size using a coupled transmission line is proposed. This filter operates at 2.79 GHz, that it is applicable in wireless communications. The filter is composed of the coupled transmission line and T-shaped resonators (as main resonators). The proposed filter with fractional band width (FBW) of 1.64% ha...
Article
In this paper, a novel compact Wilkinson power divider with harmonics suppression using meandered compact microstrip resonating cells (MCMRC) at 2 GHz is proposed. In the design structure an open stub is used to suppress 2nd harmonic and two proposed MCMRC units are inserted into quarter wavelength lines of the conventional power divider to suppres...
Article
In this paper, a novel compact microstrip low-pass filter (LPF) with ultra wide stop band and sharp roll off, is proposed. In the proposed structure, a high impedance transmission line is loaded by compact microstrip resonant cells, which results in ultra wide stopband. The −3 dB cut-off frequency of filter is 1.5 GHz and the maximum insertion loss...
Article
Full-text available
A compact power amplifier matched by a proposed lowpass filter (LPF) with nth harmonics suppression is presented in this paper. In the proposed PA, the LPF is applied as an output transformer network, which transforms 50 Ω to the desired impedance to have maximum power. In this method the conventional output matching network is eliminated, which re...
Article
A novel compact Gysel power divider with up to 12th, harmonics suppression was proposed in this study. Incorporation of six similar low-pass filters into the conventional Gysel power divider is applied to this design. The proposed power divider reduces the occupied area to only 9 % of the conventional Gysel power divider at 625 MHz (91 % size reduc...
Article
Full-text available
In this paper, a novel ultra-low-power 10-bit successive approximately register analogue to digital converter (SARADC) in 90 nm CMOS is presented. The proposed SARADC works on the 100 kHz frequency, which is desired for wireless sensor network applications. In this frequency, the comparator is the major power consuming unit of the ADC. Therefore, t...