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1030 documents found for International Journal
MRF volume 9 issue 10 Cover and Back matter
Published online : 01-12-2017
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MRF volume 9 issue 10 Cover and Front matter
Published online : 01-12-2017
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Completely integrated multilayered weave electro-textile antenna for wearable applications
Esther F. Sundarsingh, Malathi Kanagasabai, Vimal Samsingh Ramalingam
Published online : 01-12-2017
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This paper proposes a unique, first of its kind fabrication technique for the making of textile antennas. A novel method that provides scope for automation in textile antenna production is presented here. A completely integrated textile antenna fabrication method that eliminates the tasks of positioning and fastening of the various components of a patch antenna is discussed. The technique employs
Fractal antenna arrays for MIMO radar applications
Christoph Dahl, Michael Vogt, Ilona Rolfes
Published online : 01-12-2017
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In this contribution, fractal antenna arrays are analyzed for their applicability in multiple-input multiple-output (MIMO) radars. Array geometries based on the Fudgeflake fractal and the Gosper island fractal are investigated. In addition, a concept for the combination of both fractals is shown in order to increase the flexibility concerning the number of transmitting and receiving antennas. The
Two-dimensional scattering of a Gaussian beam by a homogeneous gyrotropic circular cylinder
Shi-Chun Mao, Zhen-Sen Wu, Zhaohui Zhang, Jiansen Gao
Published online : 01-12-2017
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Two-dimensional scattering of a Gaussian beam by a homogeneous gyrotropic circular cylinder is presented. The incident Gaussian beam source is expanded as an approximate expression with Taylor's series. The transmitted field in the homogeneous gyrotropic cylinder is expressed in terms of the series of wave functions based on the integral equation. The unknown coefficients of the scattered fields a
Design of dual/tri-frequency impedance transformer with ultra-high transforming ratio
Rusan Kumar Barik, S. S. Karthikeyan
Published online : 01-12-2017
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In this article, the design of a new dual-band impedance transformer with ultra-high transforming ratio UHTR is presented. The closed-form expressions are derived analytically using a lossless transmission-line theory. To practically validate the proposed design concept, two examples of dual-band transformer working at smaller and larger frequency ratios are designed for different load impedance o
A performance-enhanced planar Schottky diode for Terahertz applications: an electromagnetic modeling approach
Amir Ghobadi, Talha Masood Khan, Ozan Onur Celik, Necmi Biyikli, Ali Kemal Okyay, Kagan Topalli
Published online : 01-12-2017
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In this paper, we present the electromagnetic modeling of a performance-enhanced planar Schottky diode for applications in terahertz (THz) frequencies. We provide a systematic simulation approach for analyzing our Schottky diode based on finite element method and lumped equivalent circuit parameter extraction. Afterward, we use the developed model to investigate the effect of design parameters of
Microstrip band-pass filter with ?67 dB stop band up to 8.8 times the pass-band center frequency
Frederick Huang
Published online : 01-12-2017
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Step-impedance resonators and step-impedance capacitor coupling pads are introduced to microstrip band-pass filters to suppress spurious stop-band responses up to the ninth order, thereby providing a very wide stop band. Combined with improvements in existing suppression techniques, the overall suppression in one of the filters, with 1 GHz center frequency and 42% bandwidth, is ?54 dB, up to 8.9 G
A miniaturized directional antenna for microwave breast imaging applications
Md Zulfiker Mahmud, Mohammad Tariqul Islam, Md Naimur Rahman, Touhidul Alam, Md Samsuzzaman
Published online : 01-12-2017
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A novel compact directional antenna with improved gain is proposed for microwave breast imaging (MBI) applications. The radiating fins are modified by etching several slots to make the antenna compact and enhance antenna performance in terms of bandwidth, gain, efficiency, and directivity. Several parameters are studied and optimized to frequency from 3.1 to 6.5 GHz, which is typically used in the
A compact elevated CPW-fed antenna with slotted ground plane for wideband applications
Reeta Devi, Dipak KR. Neog
Published online : 01-12-2017
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In this paper, a miniaturized elevated-coplanar-waveguide-fed antenna with a slotted ground plane is proposed. This antenna has a compact size of 25 mm × 25 mm × 1.6 mm where the ground plane is reduced by etching a trapezoidal slot along with two extended slits. A ?10 dB wide-impedance bandwidth of 126% ranging from 2.8 to 12.4 GHz is achieved for the proposed antenna. The proposed antenna is suc
Correlation coefficient calculations for MIMO antenna systems: a comparative study
Mohammad S. Sharawi, Abdelmoniem T. Hassan, Muhammad U. Khan
Published online : 01-12-2017
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The correlation coefficient () is an important metric for the evaluation of multiple-input?multiple-output (MIMO) antenna systems because it describes the relationship between the channels in a particular propagation environment. Highly correlated channels will degrade the MIMO system performance. Various methods to calculate are analyzed in this work using three different types of antennas with
A novel uniplanar wideband magneto-electric dipole antenna element
Chen-Yang Shuai, Guang-Ming Wang, Ya-Wei Wang
Published online : 01-12-2017
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A novel uniplanar wideband magneto-electric dipole antenna element is proposed in this paper. The proposed antenna is composed of the conventional bow-tie radiation patch as an electric dipole, a semi-circular loop, which works as a magnetic dipole, a coplanar ground plane, two directors with different lengths for enhancing gain, and a microstrip-to-coplanar stripline transition balun. The designe
Efficient design of axially corrugated coaxial-type multi-band horns for reflector antennas
Pengyu Zhang, Jiaran Qi, Jinghui Qiu
Published online : 01-12-2017
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A highly efficient design procedure for dielectric-loading multi-band coaxial-type feed antennas is proposed in this paper. Cylindrical modal matching method is employed for generalized scattering matrix calculation inside the feed, while spherical wave expansion is adopted for the feed aperture discontinuity in consideration of the outer shape. Closed-form scattering matrices with respect to diff
Compact multi-layer -way power divider with closed-ring-shaped isolation network
Shunyong Hu, Kaijun Song, Yong Fan
Published online : 01-12-2017
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A compact multi-layer N-way power-dividing structure with good isolation and output return loss performance is proposed. The isolation network is circularly distributed that constitutes a closed ring-shaped architecture. The equivalent circuit model is given and the [S] matrix is developed to analyse and design the power-dividing structure. Finally, a six-way power divider centered at 2.1 GHz is d
Wide-stopband bandpass-filtering power divider with high-frequency selectivity
Kaijun Song, Yifang Zhou, Maoyu Fan, Yu Zhu, Yong Fan
Published online : 01-12-2017
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A wide-stopband bandpass-filtering power divider with high-frequency selectivity has been proposed in this paper. The input and output feeding lines and eight 1/4 wavelength resonators are used to realize the signal transmission. In order to obtain good frequency selectivity, source-load coupling transmission path is used to generate transmission zeros near the passband. A four-way power divider w
Internal compact printed loop antenna for WWAN/WLAN/ISM/LTE smartphone applications
Lakbir Belrhiti, Fatima Riouch, Abdelwahed Tribak, Jaouad Terhzaz, Angel Mediavilla Sanchez
Published online : 01-12-2017
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In this paper, we designed and developed a novel internal compact printed loop antenna for WWAN/WLAN/ISM/LTE smartphone applications. The proposed antenna is composed of a meander loop antenna and a capacitively coupled feeding line. It has a planar structure, with an overall dimension of 120 × 60 mm, the antenna portion occupying a size of 20 × 60 mm, which makes it suitable for practical smartph
An axially slotted cylinder with specific inhomogeneous coatings
Z.A. Awan
Published online : 01-12-2017
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An axially slotted cylinder coated with two different types of inhomogeneous coating layers is considered. These inhomogeneous coatings have decreasing permittivity profiles. The effects of various parameters of these coatings upon the gain pattern have been investigated using numerical simulations. It is studied that the gain at certain observation angles can be enhanced or diminished by controll
MRF volume 9 issue 9 Cover and Back matter
Published online : 01-12-2017
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MRF volume 9 issue 9 Cover and Front matter
Published online : 01-12-2017
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Design of two-stage fish spear-shaped UWB bandpass filter with sharp selectivity and good out-of-band performances
Dharmendra Kumar Jhariya, Akhilesh Mohan, Manoranjan Sinha
Published online : 01-11-2017
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In this paper, a novel two-stage fish spear-shaped multimode resonator (MMR)-based ultra wideband (UWB) bandpass filter (BPF) is presented. The fish spear-shaped MMR is loaded with stepped impedance resonator in order to improve the out-of-band performance of the proposed filter. The proposed UWB BPF filter has fractional bandwidth better than 110%. In order to validate the present design approach
Indoor target localization using single marginal antenna with virtual radars support
Ali H. Muqaibel, Abdi T. Abdalla, Mohammad T. Alkhodary
Published online : 01-11-2017
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In urban target localization, the presence of walls creates virtual radars (VRs), which can be exploited to aid in localization process. The fact that multipath changes with the radar locations, which are referred to as aspect dependence property, enable us to find a radar location, which reduces wall uncertainties. This paper proposes single-antenna target localization in an enclosed structure ta
Tri-band compact ACS-fed meander-line antenna for wireless communications
Ayman Ayd R. Saad, Ahmed A. Ibrahim, Osama M. Haraz, Ayman Elboushi
Published online : 01-11-2017
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In this paper, a compact tri-band asymmetric coplanar strip (ACS)-fed meander-line antenna for wireless communications is proposed. Two inverted-L-shaped resonators are added to a simple meandered radiator for standard tri-band operation. Parametric studies indicate that operating frequencies of the proposed antenna are determined by the dimensions of the two inverted-L-shaped resonators. The meas
Miniaturized Bagley Polygon power divider by using composite right-/left-handed transmission lines
Kaijun Song, Te Kong, Xue Ren, Yu Zhu, Yong Fan
Published online : 01-11-2017
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A miniaturized Bagley Polygon power divider based on composite right/left-handed transmission line is presented. The composite right/left-handed transmission line and conventional microstrip transmission line are utilized to realize the 0° phase shift transmission line, which is used to replace the 180° transmission line of the conventional Bagley Polygon power divider. As a result, miniaturizatio
Ultra-low-loss high-pass filter with air-core short-circuit coaxial cable
Hongfei Liu, Sander Weinreb
Published online : 01-11-2017
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This paper presents a novel ultra-low-loss high-pass filter with 3 dB cutoff frequency of 890 MHz for astronomical receiver radio frequency interference mitigation application. The filter consists of three series capacitors, four shunt inductors, and microstrip circuit board. Specially, 4 shunt inductors are actualized by fabricating air-core short-circuit coaxial cable inductors in the filter box
Miniaturized filtering SIW power divider with arbitrary power-dividing ratio loaded by open complementary split-ring resonators
Mostafa Danaeian, Ali-Reza Moznebi, Kambiz Afrooz, Ahmad Hakimi
Published online : 01-11-2017
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A miniaturized substrate-integrated waveguide (SIW) power divider with embedded filter response and arbitrary power-dividing ratio loaded by open complementary split-ring resonators (OCSRRs) is presented. In the proposed power divider, the miniaturization and filtering response are realized by a pair of OCSRRs, which are etched on the metal cover of the SIW structure. The design procedure indicate
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