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967 documents found for International Journal
Gain properties of an axially slotted cylinder with two coating layers
Zeeshan Akbar Awan
Published online : 01-11-2016
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The gain properties of an axially slotted cylinder coated with two lossless layers and embedded in a certain lossless background medium have been investigated analytically. The effects of different types of coating layers, i.e. dielectric, magnetic, and Single Negative materials upon the gain characteristics of an axial slot have been discussed. It is observed that if inner layer is either of diel
A multi-mode resonator-based UWB bandpass filter with wide stopband
Ting Zhang, Fei Xiao, Xiaohong Tang, Lei Guo
Published online : 01-11-2016
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In this paper, a novel multi-mode resonator is presented, which is formed by cascading several open-circuited transmission line sections with a coupled-line section. Owing to its symmetry, even- and odd-mode analysis methods are applied to analyze its resonance characteristic. Based on this resonator, a microstrip ultra-wide bandwidth (UWB) bandpass filter is designed, fabricated, and measured. Th
Dual-band 3-way power divider and combiner based on CRLH-TLs
Mohammad Bemani, Saeid Nikmehr
Published online : 01-11-2016
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In this paper, by using composite right and left handed transmission lines and non-radiating CRLH-TLs, a dual-band 3-way series power divider (SPD) is presented. The proposed dual-band divider is designed and fabricated on an inexpensive FR4 substrate of thickness h = 0.79 mm and a relative dielectric constant of ? = 4.4 to work at 0.915 and 2.440 GHz. Also, in order to improve the isolation chara
Design of a compact multi-mode UWB band pass filter with flexible notch band employing interdigital coupled lines
Fatemeh Sabaghi, Gholamreza Karimi, Arash Ahmadi
Published online : 01-11-2016
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A novel ultra-wideband Microstrip bandpass filter using Radial Stub Loaded Resonator (RSLR) and interdigital coupled Lines is presented in this paper. The RSLR and decagonal patch form a resonator named M to create tuneable multiple notches in the passband for the suppression of Wireless Local Area Network systems? interference. To realize sharp roll-off, two adjustable transmission nulls are loca
Design of compact microstrip low-pass filter with analytical sharpness of transition band
Hesam Siahkamari, Ehsan Heidarinezhad, Ehsan Zarayeneh, Seyyed Ali Malakooti, Seyyed Mohammad Hadi Mousavi, Payam Siahkamari
Published online : 01-11-2016
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A novel microstrip low-pass filter (LPF) using radial patched resonator and modified T-shaped resonators is designed to achieve ultra-wide stop-band. Also, the designed LPF has successfully addressed the problems of compactness and insertion loss, simultaneously. LC equivalent circuit of the proposed filter is calculated and equation for the sharpness in transition band is obtained based on LC equ
Tri-band dual circularly polarized planar antenna with defective ground structure for wireless applications
B. Rama Sanjeeva Reddy, D. Vakula
Published online : 01-11-2016
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A novel tri-band asymmetric slot with defective ground structure (DGS) microstrip antenna for dual circular polarization (CP) is proposed. By placing a slot with 45° across diagonally at the center of the patch, excites resonant bands with narrow bandwidth and dual CP operation. The main design challenge is to introduce optimized defected element of circular dumbbell shape to enhance the impedance
Bandwidth enhancement of patch antennas using neural network dependent modified optimizer
Satish K. Jain
Published online : 01-11-2016
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Since a conventional microstrip patch antenna is inherently a narrowband radiator, stacked-patch antennas are commonly used either to enhance the bandwidth or to achieve multi-band characteristics. However, the stacked patch structure has a number of geometrical variables which need to be optimized to achieve the desired characteristics. The conventional design procedure involves repeated costly a
Design and characterization of an efficient multi-layered circularly polarized microstrip antenna
Pravin R. Prajapati, Amalendu Patnaik, M. V. Kartikeyan
Published online : 01-11-2016
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A novel asymmetric ?+? shaped fractal slotted circularly polarized microstrip antenna with a Yagi?Uda structure is proposed. Four asymmetric plus shape slots are embedded symmetrically in the center of all four quadrants of a square patch. To suppress undesirable higher modes, dumbbell-shaped defected ground structure (DGS) is introduced at the ground layer of the antenna. We introduce a method to
Compact ACS-fed antenna with DGS and DMS for WiMAX/WLAN applications
Kalikuzhackal Abbas Ansal, Thangavelu Shanmuganantham
Published online : 01-11-2016
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A novel compact asymmetric coplanar strip fed planar antenna with defected ground structure and defected microstrip structure for dual band application is presented. The proposed antenna is composed of defect in both ground plane and radiating strip. The antenna has an overall dimension of 21 × 15.35 × 1.6 mm when printed on a substrate with dielectric constant of 4.4 and loss tangent of 0.02. The
Wideband and compact slot loaded annular ring microstrip antenna using L-probe proximity-feed for wireless communications
Anil Kumar Singh, Ravi Kumar Gangwar, Binod K. Kanaujia
Published online : 01-11-2016
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A wideband orthogonally slot cut annular ring microstrip antenna fed by L-shaped probe is investigated using modal expansion cavity model and circuit theory approach. Simulation of the proposed antenna is performed using and simulated results are compared with the measured and theoretical results. The impedance bandwidth of about 37.46% is observed at resonant frequency 3.15 GHz. The proposed ant
MRF volume 8 issue 7 Cover and Back matter
Published online : 01-11-2016
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MRF volume 8 issue 7 Cover and Front matter
Published online : 01-11-2016
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The effects of non-linearity in spectrum sensing receivers
Vesa Turunen, Marko Kosunen, Sami Kallioinen, Aarno Pärssinen, Jussi Ryynänen
Published online : 01-11-2016
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This paper analyses the effects of receiver non-linearity on the performance of the most commonly utilized signal detectors in cognitive radio systems. The analysis covers both self-modulation products of a single orthogonal frequency-division multiplexing (OFDM) signal and intermodulation IM products of two OFDM signals, and also their contribution to the probability of false detections. As a res
A review of directional modulation technology
Yuan Ding, Vincent Fusco
Published online : 01-11-2016
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Directional modulation (DM) is an emerging technology for securing wireless communications at the physical layer. This promising technology, unlike the conventional key-based cryptographic methods and the key-based physical layer security approaches, locks information signals without any requirements of keys. The locked information can only be fully recovered by the legitimate receiver(s) priory k
Generalized dual-band branch-line coupler with arbitrary power division ratios
Seyed-Ali Malakooti, Mohsen Hayati, Veria Fahimi, Behnam Afzali
Published online : 01-11-2016
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In this paper, a novel design of generalized dual-band quadrature hybrid with arbitrary power division ratios is presented and investigated. This coupler has a simple structure and can cover a wide range of power division ratios at the two designated frequencies. Exact closed-form equations are derived based on the even?odd-mode analysis method. The proposed structure offers some special features,
Dual-frequency phase shifter deploying complementary split-ring resonator
Indhumathi Kulandhaisamy, Dinesh Babu Rajendran, Malathi Kanagasabai, Balaji Moorthy, Jithila V. George, Livya Lawrance
Published online : 01-11-2016
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Phase shifters are indispensable microwave components. In this paper, a dual-frequency, passive, analog, and reciprocal phase shifter is proposed, deploying the phase-delay characteristics of complementary split-ring resonator (CSRR). A transmission line is loaded with a pair of CSRR in the ground plane and the phase variations are compared with an ideal transmission line. The proposed phase shift
MRF volume 8 issue 6 Cover and Back matter
Krzysztof Kulpa
Published online : 01-09-2016
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MRF volume 8 issue 6 Cover and Front matter
Krzysztof Kulpa
Published online : 01-09-2016
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Editorial
Krzysztof Kulpa
Published online : 01-09-2016
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Noise radar sidelobe suppression algorithm using mismatched filter approach
Janusz S. Kulpa
Published online : 01-09-2016
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Continuous wave radars usually use separate transmit and receive antennas that are close to each other. In such a configuration, the antenna crosstalk is the strongest echo acquired by the radar surveillance channel. Sidelobes of the strongest echo are spread over all range cells, limiting the dynamic range of the radar. In this paper, a mismatched filter approach is presented that substitutes cla
Ka-band antenna arrays with dual-frequency and dual-polarized patch elements
Benjamin Rohrdantz, Thomas Jaschke, Frauke K. H. Gellersen, Anton Sieganschin, Arne F. Jacob
Published online : 01-09-2016
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In this contribution a dual-band, dual-polarized microstrip antenna element for array applications is presented. The patch antenna is designed to operate simultaneously at around 30 and 20 GHz, the up- and downlink frequencies of modern Ka-band satellite communication systems. The antenna is smaller than half the freespace wavelength at 30 GHz to enable its utilization as array element of dual-ban
Assessment of the rain drop inertia effect for radar-based turbulence intensity retrievals
Albert C.P. Oude Nijhuis, Felix J. Yanovsky, Oleg Krasnov, Christine M.H. Unal, Herman W.J. Russchenberg, Alexander Yarovoy
Published online : 01-09-2016
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A new model is proposed on how to account for the inertia of scatterers in radar-based turbulence intensity retrieval techniques. Rain drop inertial parameters are derived from fundamental physical laws, which are gravity, the buoyancy force, and the drag force. The inertial distance is introduced, which is a typical distance at which a particle obtains the same wind velocity as its surroundings t
Design and validation tests for compact FMCW C-band Analog-Front-End for radar imaging applications
Damian Gromek, Piotr Samczy?ski, Maciej Wielgo, Mateusz Malanowski, Krzysztof Kulpa
Published online : 01-09-2016
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This paper presents the design, implementation, and validation tests of a C-band analog-front-end (AFE) for the frequency modulated continuous wave (FMCW) radar. The system was designed to be used in various radar applications, including short rage mode, synthetic aperture radar (SAR) and moving target indication (MTI) mode. The AFE presented here was based on commercial off-the-shelf radio freque
High-resolution signal processing techniques for through-the-wall imaging radar systems
Ahmet Serdar Turk, Pinar Ozkan-Bakbak, Lutfiye Durak-Ata, Melek Orhan, Mehmet Unal
Published online : 01-09-2016
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Through-the-Wall Imaging is an ever-expanding area in which processing time, scanning time, vertical, and horizontal resolutions have been tried to improve. In this study, several methods are investigated to obtain efficient reconstruction of through-the-wall imaging radar signals with high resolution. Microwave radar signals, which are produced in YTU Microwave Laboratory, are processed by compre
Time-frequency tomographic imaging of a rotating object in a narrow-band radar
Ewa Swiercz
Published online : 01-09-2016
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The backscatter from radar object carries Doppler information of scatterers on the object determined by the radial velocity of scattering points and the radar transmitted frequency. For a rotating object this information is contained in the frequency characteristics over varying aspect angle. Frequency characteristics are used to create projections for Doppler radar tomographic imaging. This paper
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