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1201 documents found for International Journal
MRF volume 11 issue 3 Cover and Back matter
Published online : 01-04-2019
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MRF volume 11 issue 3 Cover and Front matter
Published online : 01-04-2019
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The optimal design and analysis of wideband second-order microwave integrator
Usha Gautam, Tarun Kumar Rawat
Published online : 01-04-2019
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The implementation of stable, accurate, and wideband second-order microwave integrators (SOMIs) is presented in this paper. These designs of SOMIs are obtained by using different combinations of transmission line sections and shunt stubs in cascading. Particle swarm optimization (PSO), cuckoo search algorithm (CSA), and gravitational search algorithm (GSA) are applied to obtain the optimal values
Time reversal imaging based on joint space?frequency and frequency?frequency data
Tong Mu, Yaoliang Song
Published online : 01-04-2019
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A new time reversal (TR) method for target imaging is proposed in this paper. Through single measurement by the antenna array, the received signals are utilized to form the space?frequency?frequency multistatic data matrix (MDM). Singular value decomposition is applied to the matrix to obtain the left singular vectors which span the signal subspace. The obtained vectors are divided into multiple s
Transmission line approach of zero-index metamaterials and applications using a wave concept iterative method
Mohamed Karim Azizi, Taieb Elbellili, Henri Baudrand, Hichem Trabelsi
Published online : 01-04-2019
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In this paper, we propose a novel study of zero-index materials (ZIM) based on lumped element circuits using a wave concept iterative method (WCIP). This method is well used to demonstrate the behavior of zero-index-based microwave applications. This type of metamaterial can maintain the amplitude and the phase of an electromagnetic wave to be constant through the ZIM region, which is an important
Design and implementation of 2.5D frequency-selective surface based on substrate-integrated waveguide technology
Krushna Kanth Varikuntla, Raghavan Singaravelu
Published online : 01-04-2019
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In this paper, the patch-type frequency selective surfaces (FSS) based on substrate-integrated waveguide (SIW) technology is proposed to improve the bandwidth (BW) and angular performance. The proposed FSS configuration overcomes the limitations of both conventional 2D and 3D FSS structures. A closely coupled cascaded mechanism is employed to combine two identical FSS elements separated by thin di
Miniaturized open-ended dual-band band-pass filter with series stepped capacitance and shunt meandered line inductance for microwave frequency applications
Naveen Mishra, Dilip Kumar Choudhary, Raghvendra Kumar Chaudhary
Published online : 01-04-2019
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In this paper, a miniaturized open-ended dual-band band-pass filter with stepped series capacitance and shunt meandered line inductance for microwave frequency applications has been designed and discussed. In order to offer ease of fabrication and uniplanar configuration, coplanar waveguide feeding arrangement has been used. Zeroth order resonance, a special phenomenon of composite right/left hand
Fast modeling of electromagnetic scattering from 2D electrically large PEC objects using the complex line source type Green's function
Deniz Kutluay, Taner O?uzer
Published online : 01-04-2019
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This study introduces an alternative approach to the numerical solution of two-dimensional (2D) electromagnetic scattering problems by a numerical method of moments (MoM). The real source position vector is replaced by a complex quantity, then Green's function generates a complex source point beam, therefore the interactions between the far zone elements in the impedance matrix are neglected, exce
Bandwidth enhancement using modified L-probe fed slotted patch antenna for WLAN and UMTS applications
Rakesh N. Tiwari, Prabhakar Singh, Binod Kumar Kanaujia
Published online : 01-04-2019
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In this paper, two different radiating structures fed with modified L-probe, are reported using a circuit theory concept. The proposed antennas are operating in wireless local area network (WLAN) and universal mobile telecommunications system (UMTS) frequency bands. In the first design, an E-shaped patch is studied to increase the bandwidth. It is observed that the bandwidth is directly proportion
Microwave imaging based on two hybrid particle swarm optimization approaches
Bouzid Mhamdi
Published online : 01-04-2019
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In this paper, the solution of the inverse scattering problem for determining the shape and location of perfectly conducting scatterers by making use of electromagnetic scattered fields is presented. Based on the boundary condition and the measured scattered field, a set of nonlinear integral equations is derived and the imaging problem is reformulated into an optimization one. Then, two evolution
Design, fabrication, and test of a novel broadband dual-polarized microstrip antenna for WLAN applications
Majid Karimipour, Iman Aryanian
Published online : 01-04-2019
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A dual-polarized dual-layer wideband microstrip antenna is presented. Dual orthogonal linear polarization and enhanced isolation between two ports are achieved by employing two radiating patches perpendicular to each other and printed on two separate substrates. Broadband behavior of the antenna is realized by using two wideband double-sided printed strip dipole and angular ring as radiating patch
Octagonal-shaped wideband MIMO antenna for human interface device and -band application
Sanjay Chouhan, Debendra Kumar Panda, Vivek Singh Kushwah, Pankaj Kumar Mishra
Published online : 01-04-2019
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A four-element wide-band octagonal ring-shaped antenna is proposed for human interface device and -band applications. The isolation structure comprises a parasitic element and a -shaped structure. The antenna has ?10 dB impedance bandwidth 63% (2.1?4.0 GHz) with miniaturized dimension of 54.98 mm × 76 mm. The multiple input multiple output (MIMO) antenna gain is 2.83 dBi at the 2.4 GHz resonant fr
Modeling and measurement of microwave propagation multipath channels in drill pipe bore
Wenhe Xia, Wenting Guan, Zujun Jiang, Yingfeng Meng, Bo Tang
Published online : 01-04-2019
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In this paper, the characteristics of microwave propagation channels in drill pipe bore are analyzed by regarding the drill pipe as an irregular lossy cylindrical waveguide. An attenuation law is modeled using multipath propagation theory and an experimental statistical method. It is shown from physical measurement results that 5? and drill pipe bores, widely applied in the field of air drilling,
Clutter removal for measuring low-frequency narrow-band antenna using spectral estimation
C. F. Hu, N. J. Li
Published online : 01-04-2019
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The measurement accuracy of low-frequency narrow-band antenna is heavily influenced by its environment, which is also difficult to remove the clutter with a time gating. This paper proposes a method to improve the measurement accuracy of low-frequency narrow-band antenna using signal processing technique. The method is to predict the unknown value out of received original signal with an auto-regre
MRF volume 11 issue 2 Cover and Back matter
Published online : 01-03-2019
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MRF volume 11 issue 2 Cover and Front matter
Published online : 01-03-2019
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A hybrid surface-to-surface transition-based UWB-BPF with multiple in-band interference suppression
Abu Nasar Ghazali, Jabir Hussain, Srikanta Pal
Published online : 01-03-2019
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A compact ultra-wideband (UWB) bandpass filter (BPF) based on surface-to-surface transition technology with features of extended stopband and integrated interference mitigation characteristics is proposed. The basic structure consists of a modified multiple-mode resonator (MMR)-based co-planar waveguide in the ground surface and coupled in broadside manner with the microstrip lines on the top surf
A streamlined drain-lag model for GaN HEMTs based on pulsed S-parameter measurements
Peng Luo, Frank Schnieder, Olof Bengtsson, Valeria Vadalà, Antonio Raffo, Wolfgang Heinrich, Matthias Rudolph
Published online : 01-03-2019
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Accurately and efficiently modeling the drain-lag effects is crucial in nonlinear large-signal modeling for Gallium Nitride high electron mobility transistors. In this paper, a simplified yet accurate drain-lag model based on an industry standard large-signal model, i.e., the Chalmers (Angelov) model, extracted by means of pulsed S-parameter measurements, is presented. Instead of a complex nonline
A novel balanced-to-balanced power divider based on three-line coupled structure
Zhen Tan, Qing-Yuan Lu, Jian-Xin Chen
Published online : 01-03-2019
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This paper presents a novel balanced-to-balanced power divider (PD) based on a simple and compact three-line coupled structure for the first time. By bisecting the proposed symmetrical structure, the differential mode (DM) and the common mode (CM) equivalent circuits can be obtained for analysis. The DM equivalent circuit exhibits a three-line in-phase power dividing response, and then a resistor
Design and development of wide band dual-polarized magneto electric dipole antenna for mobile communications
Lakshminarayana Pollayi, Rama Krishna Dasari, Vijay M. Pandharipande
Published online : 01-03-2019
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A shorted magneto electric dipole with orthogonal dual polarization is designed for modern wireless communications. The proposed antenna is a wideband dual-polarized antenna consisting of magneto electric dipoles, which are fed by novel hook-shaped strip feeds. The antenna proposed in this paper is simulated using EM simulation software called high-frequency structure simulator. The simulated and
Compact polarimetry for automotive applications
Christian Erhart, Steffen Lutz, Marc A. Mutschler, Philipp A. Scharf, Thomas Walter, Hubert Mantz, Robert Weigel
Published online : 01-03-2019
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Though compact polarimetric approaches have been developed and applied in space and geo researching systems they have not been taken into consideration in automotive applications, yet. A sensor system has been designed to conduct polarimetric measurements in the 77 GHz frequency band, which is permitted for automotive usage. This system is able to transceive linearly as well as circularly polarize
An improved gain-phase error self-calibration method for robust DOA estimation
Wencan Peng, Chenjiang Guo, Min Wang, Yuteng Gao
Published online : 01-03-2019
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A novel online antenna array calibration method is presented in this paper for estimating direction-of-arrival (DOA) in the case of uncorrelated and coherent signals with unknown gain-phase errors. Conventional calibration methods mainly consider incoherent signals for uniform linear arrays with gain-phase errors. The proposed method has better performance not only for uncorrelated signals but als
A compact planar diplexer based on via-free CRLH TL for WiMAX and WLAN applications
Abhishek Kumar, Dileep Kumar Upadhyay
Published online : 01-03-2019
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In this paper, design and development of a via-free composite right/left handed transmission line (CRLH TL)-based diplexer for WiMAX and WLAN bands is reported. The diplexer is having two channels, where each channel consists of a separate bandpass filter (BPF). The BPF of both channels are designed on via-free CRLH TLs based on a newly proposed right-angled corner-modified split ring resonator (R
The quest for perfect electromagnetic absorber: a review
Manish Mathew Tirkey, Nisha Gupta
Published online : 01-03-2019
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This paper specifies a concise review of recent research and development in the context of electromagnetic absorbers. An attempt has been made to justify the need for economical and thin microwave absorbers for achieving good absorption characteristics over a wide range of frequencies within a specified band of electromagnetic spectrum. This paper mainly focuses on the challenges encountered while
Design of graded honeycomb radar absorbing structure with wide-band and wide-angle properties
Yuchen Zhao, Fang Ren, Li He, Jinsheng Zhang, Yanning Yuan, Xiaoli Xi
Published online : 01-03-2019
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In this paper, the design of a graded honeycomb radar absorbing structure (RAS) is presented to realize both a wide bandwidth and absorption over a wide range of angles. For both transverse-electric and transverse-magnetic polarization, a fractional bandwidth of more than 118.6% is achieved for at least a 10 dB reflectivity reduction when the incident angle is <45°, an 8 dB reduction when the inci
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