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1158 documents found for International Journal
MRF volume 10 issue 10 Cover and Back matter
Published online : 01-12-2018
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MRF volume 10 issue 10 Cover and Front matter
Published online : 01-12-2018
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A blind signal detection algorithm for passive location system based on troposcatter
Zan Liu, Xihong Chen, Qiang Liu, Zedong Xie
Published online : 01-12-2018
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To improve detection performance of passive location system based on troposcatter, we propose a blind signal detection algorithm. According to our algorithm, complementary ensemble empirical mode decomposition decomposes the received signal into several intrinsic mode functions (IMFs). To reconstruct the signal and background noises, difference between the entropy of adjacent IMFs is utilized as a
High gain dual-band distributed amplifier using new composite right/left-handed transmission line
Hamed Shahraki, Ahmad Hakimi, Kambiz Afrooz, Mohammad Mahdi Pezhman
Published online : 01-12-2018
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In this paper, a high-gain dual-band distributed amplifier (DBDA) based on the metamaterial transmission line (TL) is proposed. To have two separate frequency bands in the distributed amplifiers, the composite right/left-handed (CRLH) TLs are used instead of conventional TLs. Although both forward and reverse gains of the distributed amplifiers are available in this case, they suffer from their lo
A dual-wideband bandpass filter using open/shorted coupled lines
Xiao-Le Bo, Yong-Hong Zhang, Xiao-Kun Li, Yang Yang, Yin Tian, Yong Fan
Published online : 01-12-2018
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A compact dual-wideband (DWB) bandpass filter utilizing open-shorted coupled lines (OSCL) is proposed in this paper. The introduction of the folded structure not only reduces the overall size but also contribute to the split of the transmission zero (TZ), which improves the selectivity effectively. Six transmission poles and five TZs are realized utilizing the shorted-circuit stub and OSCL. The ch
Compact ultra-wideband bandpass-response power divider with high-frequency selectivity
Song Guo, Kaijun Song, Yedi Zhou, Yong Fan
Published online : 01-12-2018
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The ultra-wideband bandpass-response power divider with high-frequency selectivity is presented in this paper. This power divider consists of an impedance transformer, a filter network, and two isolation resistors. In order to realize the ultra-wideband filtering performance, parallel coupling lines and parallel open-circuit branches are applied to the second impedance converter. A resistor is add
Miniaturized branch-line coupler based on slow-wave microstrip lines
H. Alhalabi, H. Issa, E. Pistono, D. Kaddour, F. Podevin, S. Abouchahine, P. Ferrari
Published online : 01-12-2018
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This paper presents a miniaturized 3-dB branch-line coupler based on slow-wave microstrip transmission lines. The miniaturized coupler operating at 2.45 GHz is designed and implemented on a double-layer printed circuit board substrate with blind metallic vias embedded in the lower substrate layer providing the slow-wave effect. Based on this concept, a 43% size miniaturization is achieved as compa
A review of radar signals in terms of Doppler tolerance, time-sidelobe level, and immunity against jamming
Samer Baher Safa Hanbali
Published online : 01-12-2018
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Pulse compression technique allows a radar to achieve the resolution of a short pulse and the energy of a long pulse simultaneously, without the requirement of high-power transmission. Therefore, pulse compression radars have a low probability of intercept capability. The common types of pulse compression signals are frequency modulated waveforms and phase-coded waveforms, which have different pro
Tradeoffs in the feed point selection of a cylindrical dielectric resonator antenna
Anuj Kumar Ojha, A. V. Praveen Kumar
Published online : 01-12-2018
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This paper aims at investigating the dependence of the impedance and the radiation characteristics of a cylindrical dielectric resonator antenna (DRA), on the feed point of the DRA. It is demonstrated that the resonant frequency, bandwidth, radiation pattern symmetry, and cross-polarized radiation levels depend highly on the feed point. Three standard single-ended feed mechanisms such as the micro
Time-domain analysis of compact dual band-notched slot antenna in indoor environments
Seyed Ramin Emadian, Javad Ahmadi-Shokouh
Published online : 01-12-2018
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Frequency- and time-domain characteristics as well as indoor propagation channel impulse response of a compact dual band-notched ultra-wideband (UWB) slot antenna are investigated in this paper. The antenna consists of a narrow rectangular radiation patch and a rectangular wide slot in the modified ground plane. A pair of -shaped stubs are connected to the radiation patch to obtain band-notched pr
Design and performance analysis of dual-band wearable compact low-profile antenna for body-centric wireless communications
Abdullah Al-Sehemi, Ahmed Al-Ghamdi, Nikolay Dishovsky, Nikolay Atanasov, Gabriela Atanasova
Published online : 01-12-2018
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In this paper, we present a novel dual-band wearable compact flexible antenna for body-centric wireless communications (BCWCs). The design is based on a modified planar dipole with parasitic elements, meandered lines, and a rectangular reflector embedded into a hydrophobic rubber-textile multilayer substrate in order to get both good antenna performance and mechanical properties. The antenna's str
CPW slot antenna with Y-shaped central monopole and matching arms
Daniele Inserra, Xiaochuan Fang, Yongjun Huang, Guangjun Wen
Published online : 01-12-2018
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A coplanar waveguide slot antenna is herein presented. A rectangular slot is excited by a Y-shaped monopole etched on a single FR4 substrate. This structure exhibits two resonances due to the presence of the slot and the central monopole which can be used to design a dual-band or a wideband antenna. A parametric analysis is presented to describe the impedance matching mechanism for the two impedan
Depiction and analysis of a modified H-shaped double-negative meta atom for satellite communication
Md. Jubaer Alam, Mohammad Rashed Iqbal Faruque, Rezaul Azim, Mohammad Tariqul Islam
Published online : 01-12-2018
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A modified H-shaped metamaterial is imparted in this paper that has a multiple band coverage for reflection and transmission coefficient. The proposed structure exhibits triple band coverage for the permittivity and permeability. Two split ring resonators (SRR) are connected with the substantial H-shaped structure. The 12 × 12 mm structure has been printed on FR-4 and a correlation is made between
Mutual coupling reduction with a wideband planar decoupling structure for UWB?MIMO antennas
Alaa H. Radhi, R. Nilavalan, Yi Wang, H. S. Al-Raweshidy, Amira A. Eltokhy, Nur Ab Aziz
Published online : 01-12-2018
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A new planar multiple-input?multiple-output (MIMO) antenna for ultra wideband (UWB) applications is presented. The proposed antenna operates over the frequency band from 3.1 to 10.6 GHz and it consists of two identical circular monopoles on an FR substrate. The wide isolation is achieved through a novel planar decoupling structure that is being inserted between the dual antennas. Moreover, a cente
MRF volume 10 issue 9 Cover and Back matter
Published online : 01-11-2018
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MRF volume 10 issue 9 Cover and Front matter
Published online : 01-11-2018
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Frequency reconfigurable antenna for cognitive radios with sequential UWB mode of perception and multiband mode of operation
Ali Mansoul, Farid Ghanem
Published online : 01-11-2018
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In this work, an UWB/narrow band reconfigurable elliptical-shaped monopole antenna for cognitive radio applications with sequential perception and operation modes is presented. The proposed approach consists in integrating a reconfigurable filter, in an UWB antenna ground plan, by the mean of four horizontal slots and integrated switches that allow inserting/removing/varying zeros and poles in the
Optimization of InP DHBT stacked-transistors for millimeter-wave power amplifiers
Michele Squartecchia, Tom K. Johansen, Jean-Yves Dupuy, Virginio Midili, Virginie Nodjiadjim, Muriel Riet, Agnieszka Konczykowska
Published online : 01-11-2018
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In this paper, we report the analysis, design, and implementation of stacked transistors for power amplifiers realized on InP Double Heterojunction Bipolar Transistors (DHBTs) technology. A theoretical analysis based on the interstage matching between all the single transistors has been developed starting from the small-signal equivalent circuit. The analysis has been extended by including large-s
A miniaturized broadband monopulse comparator with all DELTA channels nulling in Ku band
Saeid Alamdar, Karim Mohammadpour-Aghdam, Hossein Khalili, Mahmoud Mohammad-Taheri
Published online : 01-11-2018
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A compact monopulse comparator with complete nulling in all DELTA channels is designed and fabricated. The proposed comparator has small dimension and consists of interconnections of four broadband branch-line couplers and several 90° phase shifters with multistage Schiffman coupled-lines. This comparator has been characterized by its eight-port -parameters to generate the SUM and DELTA channel fr
A negative permittivity metamaterial composed of planar resonators with randomly detuned resonant frequencies and randomly distributed in space
Jan Machac
Published online : 01-11-2018
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This paper investigates metamaterials composed of resonant particles with negative electric polarizability located in a three-dimensional net. The main problem in fabricating these materials is the spread of the resonant frequencies of particular planar resonators. This spread is caused by the tolerances of the fabrication process for planar resonators. The simulation shows that there is a limit t
CPW-fed concurrent, dual band planar antenna for millimeter wave applications
Smriti Agarwal, Dharmendra Singh
Published online : 01-11-2018
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In recent years, millimeter wave (MMW) has received tremendous interest among researchers, which offers systems with high data rate communication, portability, and finer resolution. The design of the antenna at MMWs is challenging as it suffers from fabrication and measurement complexities due to associated smaller dimensions. Current state-of-the-art MMW dual-band antenna techniques demand high p
Wideband isolation-improved substrate-integrated waveguide power dividers/combiners
Yong Mao Huang, Haiyan Jin, Yuliang Zhou, Supeng Leng, Maurizio Bozzi
Published online : 01-11-2018
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In this paper, a 3 dB -plane substrate-integrated waveguide (SIW) power divider/combiner with improved isolation is reported. By adding two isolated ports into the Y-junction, it will perform like a multi-port coupler, so that the isolation between its dividing ports can be effectively improved as the newly-added ports are properly matched. To verify the availability and effectiveness of this conc
Design and development of patch compensated wideband Vivaldi antenna
Rana Pratap Yadav, Vinay Kumar, Rajveer Dhawan
Published online : 01-11-2018
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Design and fabrication of a microstrip feedline-based Vivaldi antenna in the frequency range of 6.0?8.0 GHz have been presented. The Vivaldi antenna is a planar antenna, fabricated at the microstrip feedline by having an exponentially tapered slot profile on it. An optimized computer-aided design has been developed and simulated for the desired radiation parameters like voltage standing wave ratio
Hybrid phase retrieval algorithm based on modified very fast simulated annealing
Yueshu Xu, Qian Ye, Guoxiang Meng
Published online : 01-11-2018
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The Misell algorithm is one of the most widely used phase retrieval holography methods for large reflector antennas to measure surface deformation. However, it usually locks in a local minimum because it heads downhill from an initial estimation without any consideration whether it heads for a global minimum or not. The core problem of the Misell algorithm is to find an initial estimation near the
Design of reconfigurable monopole antenna with switchable dual band-notches for UWB applications
Hailong Yang, Xiaoli Xi, Hualong Hou, Yuchen Zhao, Yanning Yuan
Published online : 01-11-2018
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A compact printed reconfigurable monopole antenna with switchable band-notches is designed and manufactured. The proposed antenna mainly consists of a disc-like radiator with two pairs of T-shaped strips protruded inside a rectangular aperture. Five PIN diode switches are employed to bridge or open the slots, which allow the antenna to be configured into three different structures functioning as a
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