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1684 documents found for International Journal
EuCAP 2020 special issue
S. Monni, M. Sierra Castaner
Published online : 01-07-2022
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MRF volume 14 issue 6 Cover and Back matter
S. Monni, M. Sierra Castaner
Published online : 01-07-2022
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MRF volume 14 issue 6 Cover and Front matter
S. Monni, M. Sierra Castaner
Published online : 01-07-2022
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Development of a millimeter-wave transparent antenna inside a headlamp for automotive radar application
Sofian Hamid, Dirk Heberling, Manuela Junghähnel, Thomas Preussner, Patrick Gretzki, Ludwig Pongratz, Christian Hördemann, Arnold Gillner
Published online : 01-07-2022
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The development of a millimeter-wave transparent antenna integrated inside a headlamp for automotive radar application is presented. The antenna consists of two radiating elements: the primary and secondary ones. The primary antenna is the one that is fabricated on RF PCB material (e.g., patch, slot, sectoral horn) and connected directly to the transceiver chip, while the secondary antenna is made
Cost-effective millimeter-wave measurement setup for narrowband path loss and angle-of-arrival measurements: uncertainty analysis and specular building reflection measurements
R. Schulpen, L. A. Bronckers, A. B. Smolders, U. Johannsen
Published online : 01-07-2022
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A cost-effective millimeter-wave measurement setup for narrowband path loss and angle-of-arrival measurements is presented in this paper. The setup consists of ubiquitous radio-frequency lab equipment and additional low-cost components. An algorithm is developed, which improves the measurement accuracy and reduces the required measurement time. An uncertainty analysis is performed, including a noi
Experimental comparison of absorber and conductive floor automotive near field antenna measurement systems
F. Saccardi, F. Mioc, A. Scannavini, P. O. Iversen, J. Estrada, M. Edgerton, J. A. Graham, L. J. Foged
Published online : 01-07-2022
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Large truncated spherical near-field systems with conductive or absorbing floors are typically used in the measurement of the performances of vehicle-installed antennas. The main advantage of conductive floor systems is the ease of accommodation of the vehicle under test, but their performances are affected by the interaction with the reflecting ground floor. Instead, absorbing-based systems emula
Determining the nominal body contour image using wideband millimeter-wave radar for characterizing person-worn threats
Mohammad M. Tajdini, Carey M. Rappaport
Published online : 01-07-2022
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Precise characterization of concealed person-worn objects will speed up the passenger screening process by reducing the rate of nuisance alarms, while also enhancing the airport security imaging systems. This paper presents an automatic, real-time method for wideband millimeter-wave radar identification of the nominal surface contours of the human body ? even with affixed foreign objects or when a
Directive mmWave radio channel modeling in a ship hull
Brecht De Beelde, Andrés Almarcha Lopéz, David Plets, Marwan Yusuf, Emmeric Tanghe, Wout Joseph
Published online : 01-07-2022
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Wireless connectivity has been realized for multiple environments and different frequency bands. However, little research exists about mmWave communication in industrial environments. This paper presents the 60 GHz double-directional radio channel for mmWave communication in a ship hull for Line-of-Sight (LOS) and non-Line-of-Sight (NLOS) conditions. We performed channel measurements using the Ter
Numerical simulation of characteristics of propagation of symmetric waves in microwave circular shielded waveguide with a radially inhomogeneous dielectric filling
I.J. Islamov, E.Z. Hunbataliyev, A.E. Zulfugarli
Published online : 01-07-2022
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The paper presents a numerical simulation of the propagation characteristics of symmetric -type and -type waves in microwave circular shielded waveguide with radially inhomogeneous dielectric filling. Using the modified Galerkin method, the calculation of a circular two-layer shielded waveguide was carried out, as a result of which the distribution of the electromagnetic field of the waveguide wit
In-band RCS reduction antennas using an EBG surface
Manivara Kumar Parsha, Arnab Nandi, Banani Basu
Published online : 01-07-2022
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The paper has proposed a multilayer, polarization rotation featured, low radar cross-section (RCS) antenna using electromagnetic band-gap (EBG)-based frequency selective surface (FSS) at 8.25 GHz. Cross-shaped EBG unit cells offer zero reflection phase and ?25 dB reflection magnitude at 8.25 GHz. The FSS layer consists of eight cross-shaped EBG unit cells sandwiched between two substrates to offer
Superstrate-based patch antenna array with reduced in-band radar cross section
S. K. Vyshnavi Das, Avinash Singh, Arti A. Gurap, Hema Singh
Published online : 01-07-2022
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To design a low radar cross section (RCS) antenna, the major concern is not only to reduce scattering, but also to maintain its radiation parameters, viz. gain, voltage standing wave ratio (VSWR), etc. This paper presents a simple configuration of low RCS microstrip patch array with a periodic structure-based superstrate. The ground of the array is designed as reduced ground plane with high impeda
Investigations on a circular UWB antenna with Archimedean spiral slot for WLAN/Wi-MAX and satellite X-band filtering feature
Arnab De, Bappadittya Roy, Ankan Bhattacharya, A. K. Bhattacharjee
Published online : 01-07-2022
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In this article a compact circular monopole antenna is represented with dimensions of 38.87 × 24.00 × 1.60 mm applicable for WLAN/Wi-MAX and satellite band rejection characteristics. The impedance bandwidth is 9.42 GHz (3.12?12.54 GHz) for the final antenna with an equivalent fractional bandwidth of about 120.31%, producing triple notched bands centered at 3.95, 5.20 and 8.90 GHz with assistance o
Time-modulated linear array synthesis with optimal time schemes for the simultaneous suppression of sidelobe and sidebands
Avishek Chakraborty, Gopi Ram, Durbadal Mandal
Published online : 01-07-2022
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An efficient analysis of time-modulated array (TMA) toward realizing less-attenuating radiation patterns with simultaneously suppressed sidelobe and sidebands is presented in this paper. In this framework, an optimal outer element-controlled time sequence is derived. The proposed time scheme, along with optimized array excitations, is profitably applied for the desired solution. TMAs are considere
Fast sparse image reconstruction method in through-the-wall radars using limited memory Broyden?Fletcher?Goldfarb?Shanno algorithm
Candida Mwisomba, Abdi T. Abdalla, Idrissa Amour, Florian Mkemwa, Baraka Maiseli
Published online : 01-07-2022
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Compressed sensing allows recovery of image signals using a portion of data ? a technique that has drastically revolutionized the field of through-the-wall radar imaging (TWRI). This technique can be accomplished through nonlinear methods, including convex programming and greedy iterative algorithms. However, such (nonlinear) methods increase the computational cost at the sensing and reconstructio
Telemetry antennas withstanding very high accelerations and centrifugal forces
Loïc Bernard, Hrvoje Covic, Andreas Zeiner, Armin Schneider
Published online : 01-07-2022
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We present the design steps of a coaxial dipole antenna for telemetry applications under extreme conditions of accelerations and centrifugal forces. Both, electromagnetic and mechanical designs are explained, as well as performance compromises that have to be made between both domains. The experimental results are given in the following part of the article, before some details on the instrumented
Rain fade margin of terrestrial line-of-sight (LOS) links for 5G networks in Peninsular Malaysia
Shi Jie Seah, Siat Ling Jong, Hong Yin Lam, Jafri Din
Published online : 01-07-2022
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Advanced telecommunication systems are moving toward a high data transfer rate and wider bandwidth. The 5G communication network has recently been implemented for such aims. However, 5G networks operating with high operating frequency (typically above 20 GHz) could lead to impairments because of the atmospheric phenomena mainly precipitation and especially heavy rain. To address this, an optimum r
MRF volume 14 issue 5 Cover and Back matter
Published online : 01-06-2022
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MRF volume 14 issue 5 Cover and Front matter
Published online : 01-06-2022
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Spurline-embedded compact hairpin-line bandpass filters for wide harmonic suppression
Tarun Kumar Das, Sayan Chatterjee
Published online : 01-06-2022
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The current paper describes the design of a fourth-order compact narrow-band hairpin-line bandpass filter centered at 2.5 GHz and enhanced stopband suppression ~38 dB required for wireless local area network (IEEE802.11b). The size reduction of 24% has been achieved for a conventional hairpin-line filter with a second-order inward folding of the open-end arms with an improvement in the skirt chara
Small UWB antenna with two stop bands by a compact EBG cell loaded with new open meander slots
Farzad Alizadeh, Changiz Ghobadi, Javad Nourinia
Published online : 01-06-2022
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In this paper, a small ultra-wideband (UWB) antenna with two stop bands by a compact electromagnetic bandgap (EBG) cell loaded with two new open meander slots is presented. With the coupling of the EBG cell to the feedline, the stop bands are formed. The designed EBG cell is a mushroom type that has the advantages of being able to independently control the stop bands, high responsiveness selectivi
A review on microstrip patch antenna parameters of different geometry and bandwidth enhancement techniques
Brijesh Mishra, Ramesh Kumar Verma, N Yashwanth, Rakesh Kumar Singh
Published online : 01-06-2022
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This paper presents a comprehensive review of symmetrically shaped antennas in terms of antenna size, dielectric materials, resonating band, peak gain, radiation pattern, simulating tools, and their applications. In this article, flower shape, leaf shape, tree shape, fan shape, Pi shape, butterfly shape, bat shape, wearable, multiband, monopole, and fractal antennas are discussed. Further, a surve
A single layer wideband metasurface absorber for electromagnetic interference minimization in Ku-band applications
Yogita Khanna, Y. K. Awasthi
Published online : 01-06-2022
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In this paper, a wideband ultrathin metasurface absorber is investigated. The proposed absorber comprises a periodic array of a unit cell ring structure. The ring structure and patch inside are tuned to realize the desired frequency bandwidth. The structure has a frequency bandwidth of 7.4 GHz with a center frequency of 15 GHz and fractional bandwidth of 50%. Simulated and measured results show th
Ultra-wideband and high gain antipodal tapered slot antenna with planar metamaterial lens
Ziye Wang, Zhengwei Yang, Xiao Zhao, Linyan Guo, Minjie Guo
Published online : 01-06-2022
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To solve the problems of low gain, narrow bandwidth, and poor radiation directivity of conventional ground penetrating radar antenna, this paper proposes an ultra-wideband and high-gain antipodal tapered slot antenna (ATSA) with planar metamaterial lens. As a constituent part of this lens, a new non-resonant metamaterial unit cell is introduced and analyzed by the full-wave simulation tool. The si
Low-profile, wideband dual-polarized 1 × 2 MIMO antenna with FSS decoupling technique
B. Anudeep, K. Krishnamoorthy, P. H. Rao
Published online : 01-06-2022
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A low-profile, wideband dual-polarized 1 × 2 multiple-input-multiple-output (MIMO) antenna with frequency selective surface (FSS) decoupling technique is presented. Low profile is realized with two different artificial magnetic conductor (AMC) cells out of which one operates at 3.5 GHz and other with dual band at 3.1 and 4.5 GHz. The proposed antenna height is maintained at 0.125? which is signifi
A tuneable rat-race coupler for full duplex communications
G. T. Watkins
Published online : 01-06-2022
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Full duplex (FD) could potentially double wireless communications capacity by allowing simultaneous transmission and reception on the same frequency channel. A single antenna architecture is proposed here based on a modified rat-race coupler to couple the transmit and receive paths to the antenna while providing a degree of isolation. To allow the self-interference cancellation (SiC) to be maximiz
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