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1187 documents found for International Journal
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
A microstrip antenna with reduced in-band and out-of-band radar cross-section
Jiakai Zhang, Jiachen Xu, Yan Qu, Jun Ding, Chenjiang Guo
Published online : 01-03-2019
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This paper proposes a microstrip antenna with reduced in-band and out-of-band radar cross-section (RCS) by subtracting the area of weak scattered current on the ground plane. Fourteen square slots were subtracted from the ground plane, reducing in-band and out-of-band RCS while maintaining radiation performance. Modified and reference antenna surface current distributions were simulated and analyz
Material distributive topology design of UWB antenna using parallel computation of improved BPSO with FDTD
A. P. Thilaga Shri Chandra, L. Senthilkumar, M. Meenakshi
Published online : 01-03-2019
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In this article, the material distributive topology-based design optimization of ultra-wide band (UWB) antenna is proposed by using improved binary particle swarm optimization (BPSO) with finite difference time domain (FDTD) method. In the improved BPSO implementation, the velocity of each particle is calculated based on complete set of bits of particle position vector. The V-shaped transfer funct
A compact, dual wide-band circularly polarized, modified square ring slot antenna for C and Ku band applications
Shilpee Patil, Anil Kumar Singh, Binod Kumar Kanaujia, R. L. Yadava
Published online : 01-03-2019
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This paper presents a compact microstrip antenna using FR-4 substrate for dual band circularly polarized operation using a modified square ring slot in the ground plane with microstrip line feed. Simulation of the impedance characteristic and radiation characteristic for the proposed antenna is carried out using commercially available HFSS software. The simulated data validate measured results and
MRF volume 11 issue 1 Cover and Back matter
Published online : 01-03-2019
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MRF volume 11 issue 1 Cover and Front matter
Published online : 01-03-2019
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Addendum ? Miniaturized branch-line coupler based on slow-wave microstrip lines
H. Alhalabi, H. Issa, E. Pistono, D. Kaddour, F. Podevin, A. Baheti, S. Abouchahine, P. Ferrari
Published online : 01-02-2019
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Wideband filtering power dividers with wide stopband rejection
Gaoya Dong, Weimin Wang, Bo Zhang, Yuanan Liu
Published online : 01-02-2019
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A series of novel wideband filtering power dividers (WFPDs) with wide stopband rejection performances is proposed in this paper. The proposed WFPD structure consists of a parallel-coupled line, two transmission line (TL) sections, four loading terminations, and an isolation resistor. The coupled line is applied at the input port to provide wideband impedance transformation, while different types o
Prediction on operating range of passive troposcatter detection system
Zan Liu, Xihong Chen
Published online : 01-02-2019
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Electromagnetic wave of enemy radar propagated by troposcatter is a valuable candidate for beyond line-of-sight detection. There is no analytical study considering the operating range of passive troposcatter detection system. In this paper, we study the way to predict the operating range, which is dominated by propagation loss. The key propagation loss models including statistic model and real-tim
Time-domain analysis of a CRLH coupled-line coupler using the CN-FDTD method
Mahdieh Gholami Mayani, Shahrooz Asadi, Shokrollah Karimian
Published online : 01-02-2019
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In this study, the implicit Crank?Nicolson finite-difference time-domain (CN-FDTD) method is applied to discretize the governing telegrapher's equations of a composite right-/left-handed (CRLH) coupled-line coupler. The unconditionally stable CN-FDTD is compared with the conventional leap-frog (LF) FDTD method. The results obtained from the CN-FDTD scheme show up to 10 times increase in the tempor
Design and development of 2 kW, 3 dB hybrid coupler for the prototype Ion Cyclotron Resonance Frequency (ICRF) system
Abhinav Jain, Rana Pratap Yadav, S. V. Kulkarni
Published online : 01-02-2019
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Design and development of 2 kW, 3 dB tandem hybrid coupler for the frequency range of 155?225 MHz has been presented in this paper. The developed 3 dB coupler is to be used in a prototype of Ion Cyclotron Resonance Frequency (ICRF) system of Tokamak, which has been developed to test the resilience of ICRF network during continuously variable RF load excursions. The 3 dB coupler divides the RF powe
An autofocusing method for imaging the targets for TWI radar systems with correction of thickness and dielectric constant of wall
Sandeep Kaushal, Bambam Kumar, Dharmendra Singh
Published online : 01-02-2019
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In through the wall imaging systems, wall parameters like its thickness and dielectric constant play an important role in the true and correct image formation of an object behind the wall made of various materials like brick cement, wood, plastic, etc. Incorrect estimation of these parameters leads to dislocation of the object and smearing or blurriness of the image too. A new autofocusing techniq
Dual band- dual polarized planar inverted F-antenna for MBAN applications
Shankar Bhattacharjee, Manas Midya, Monojit Mitra, S.R. Bhadra Chaudhuri
Published online : 01-02-2019
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A planar inverted F-Antenna with the dual band-dual polarization property is presented for medical body area networks applications. The designed antenna covers the 2.45 GHz industrial, scientific and medical, 4 G long term evolution (2.5?2.69 GHz) bands for ON body communication and Wi-Fi and WLAN (3.5?3.6 GHz) bands for OFF body communication. At the lower band, an equivalent offset fed magnetic
Novel dual band patch antenna With Gap coupled composite right/left-handed transmission line
Z. Ahmed, M. M. Ahmed, M. B. Ihsan, A. A. Chaudhary, J. K. Arif
Published online : 01-02-2019
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A novel low profile dual band patch antenna is presented. It consists of a composite right/left-handed transmission line (CRLH TL) unit cell gap coupled with the radiating edge of a rectangular patch antenna. The dual band behavior is achieved by coupling the zeroth order resonance mode of CRLH TL and TM mode of the patch antenna. It is shown that frequency ratio can be changed by varying the gap
A low-profile triple-band circularly polarized wide slot antenna for wireless systems
Shilpee Patil, A. K. Singh, Binod K. Kanaujia, R. L. Yadava
Published online : 01-02-2019
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A simple design for triple-band circularly polarized (CP) wide slot antennas is proposed and experimentally investigated. The proposed antenna having a microstrip-fed rectangular patch with -shaped notch for triple-band operation and a modified wide square slot on ground plane for CP operation. The measured 10 dB reflection bandwidths are 1.24% (?340 MHz from 2.56 to 2.9 GHz), 9.63% (?430 MHz from
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