Journal ArticleDOI
A novel neural-based approach for design of microstrip filters
Mohammad Jamshidi,Ali Lalbakhsh,Bahare Mohamadzade,Hesam Siahkamari,Seyed Mohammad Hadi Mousavi +4 more
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TLDR
An intelligent design methodology of microstrip filters in which a dynamic neural network model based on Bayesian Regularization Back-Propagation (BRBP) learning algorithm is used, suggesting an excellent in and out-of-band performance.Abstract:
This paper presents an intelligent design methodology of microstrip filters in which a dynamic neural network model based on Bayesian Regularization Back-Propagation (BRBP) learning algorithm is used. In this approach, a Low-Pass Filter (LPF) composed of multiple open stubs, and stepped impedance resonators is initially designed for which an Artificial Neural Network (ANN) is trained to improve the performance of the filter. The predicted and measured results of the filter verify the effectiveness of the presented method, suggesting an excellent in and out-of-band performance. According to the measurement, the filter has a very small transition band from 2.087 to 2.399 GHz with 3 and 40 dB attenuation points, respectively, leading to a sharp roll-off rate of 118.6 dB/GHz. In addition the optimized filter has an ultra-wide stopband, extending from 2.399 to 15.01 GHz with attenuation level of 22 dB are The overall size of the fabricated filter is only 0.190 λ g × 0.094 λ g , where λ g is the guided wavelength at 3 dB cut-off frequency (2.087 GHz). A performance comparison with some of the recent published LPFs presented, showing the superiority of the proposed filter.read more
Citations
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Journal ArticleDOI
Artificial Intelligence and COVID-19: Deep Learning Approaches for Diagnosis and Treatment
Mohammad Jamshidi,Ali Lalbakhsh,Jakub Talla,Zdenek Peroutka,Farimah Hadjilooei,Pedram Lalbakhsh,Morteza Jamshidi,Luigi La Spada,Mirhamed Mirmozafari,Mojgan Dehghani,Asal Sabet,Saeed Roshani,Sobhan Roshani,Nima Bayat-Makou,Bahare Mohamadzade,Zahra Malek,Alireza Jamshidi,Sarah Kiani,Hamed Hashemi-Dezaki,Wahab Mohyuddin +19 more
TL;DR: A response to combat the virus through Artificial Intelligence (AI) is rendered in which different aspects of information from a continuum of structured and unstructured data sources are put together to form the user-friendly platforms for physicians and researchers.
Journal ArticleDOI
Design of a Compact Planar Transmission Line for Miniaturized Rat-Race Coupler With Harmonics Suppression
Ali Lalbakhsh,Golshan Mohamadpour,Saeed Roshani,Mohammad Ami,Sobhan Roshani,Abu Sadat Md. Sayem,Mohammad Alibakhshikenari,Slawomir Koziel +7 more
Abstract: 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 $\lambda $ /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 procedure is verified through the theoretical, circuit, and electromagnetic (EM) analyses, showing excellent agreement among different analyses and the measured results. The circuit and EM results show that the proposed TL replicates the same frequency behaviour of the conventional one at the design frequency of 1.8 GHz while enables harmonic suppression up to the $7^{\mathrm {th}}$ harmonic and a size reduction of 74%. According to the measured results, the RRC has a fractional bandwidth of 20%, with input insertion losses of around 0.2 dB and isolation level better than 35 dB. Furthermore, the total footprint of the proposed RRC is only 31.7 mm $\times15.9$ mm, corresponding to $0.28\,\,\lambda \times 0.14\,\,\lambda $ , where $\lambda $ is the guided wavelength at 1.8 GHz.
Journal ArticleDOI
Design and Modeling of a Compact Power Divider with Squared Resonators Using Artificial Intelligence
TL;DR: The results show that the proposed model can predict the frequency response of the designed WPD, accurately, and results in a performance improvement of the proposed divider.
Journal ArticleDOI
Size reduction and performance improvement of a microstrip Wilkinson power divider using a hybrid design technique
TL;DR: In this paper, a hybrid technique to reduce the size and improve the performance of a Wilkinson power divider (WPD) is introduced, which includes a typical series LC circuit, a miniaturizing inductor, and two transmission lines, which make an LC branch.
Journal ArticleDOI
A Design of a Dual-Band Bandpass Filter Based on Modal Analysis for Modern Communication Systems
Ali Lalbakhsh,Seyed Morteza Alizadeh,Amirhossein Ghaderi,Alireza Golestanifar,Bahare Mohamadzade,Mohammad Jamshidi,Kaushik Mandal,Wahab Mohyuddin +7 more
TL;DR: A dual-band bandpass filter (BPF) composed of a coupling structure and a bent T-shaped resonator loaded by small L-shaped stubs is presented in this article.
References
More filters
Book
Microstrip filters for RF/microwave applications
TL;DR: In this paper, the authors present a general framework for coupling matrix for Coupled Resonator Filters with short-circuited Stubs (UWB) and Cascaded Quadruplet (CQ) filters.
Journal ArticleDOI
Multiobjective Particle Swarm Optimization to Design a Time-Delay Equalizer Metasurface for an Electromagnetic Band-Gap Resonator Antenna
TL;DR: In this paper, an efficient particle swarm optimization (PSO) algorithm was developed to design a near-field time-delay equalizer metasurface (TDEM) for the purpose of improving directivity and radiation patterns of classical electromagnetic band-gap resonator antennas.
Journal ArticleDOI
New Ultra-Wide Stopband Low-Pass Filter Using Transformed Radial Stubs
Kaixue Ma,Kiat Seng Yeo +1 more
TL;DR: In this article, a new type of low-pass filter with ultra-wide band rejection and compact size by using a proposed transformed radial stubs (TRSs) is introduced and investigated.
Journal ArticleDOI
A Reconfigurable Triple-Notch-Band Antenna Integrated with Defected Microstrip Structure Band-Stop Filter for Ultra-Wideband Cognitive Radio Applications
Yingsong Li,Wenxing Li,Qiubo Ye +2 more
TL;DR: In this article, a printed reconfigurable ultra-wideband (UWB) monopole antenna with triple narrow band-notched characteristics is proposed for cognitive radio applications, which can work at eight modes by controlling switches ON and OFF.
Journal ArticleDOI
Compact microstrip lowpass filter with sharp roll-off and wide stop-band
Jia-Lin Li,Shi-Wei Qu,Quan Xue +2 more
TL;DR: In this paper, a microstrip low-pass filter with enhanced performance is developed, which is based on a novel patch resonator that features strong slow-wave effects, and can also implement either an improved roll-off or an enhanced stop-band.
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