Browsing 2018/4 by Issue Date
Now showing items 1-20 of 37
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Robust Hybrid Algorithm of PSO and SOCP for Grating Lobe Suppression and against Array Manifold Mismatch
(Společnost pro radioelektronické inženýrství, 2018-12)Based on Particle Swarm Optimization (PSO) and Second-Order Cone Programming (SOCP) algorithm, this paper proposes a hybrid optimization method to suppress the grating lobes of sparse arrays and improve the robustness of ... -
Phase Quantized Metasurface Reflectors for X-band Laguerre Gaussian Vortex Beam Generation
(Společnost pro radioelektronické inženýrství, 2018-12)From last two decade, there is an exponential growth in consumption of available bandwidth in the radio frequency spectrum. To challenge this issue, improvement in channel capacity is getting huge research attention. ... -
The DVB-T-Based Positioning System and Single Frequency Network Offset Estimation
(Společnost pro radioelektronické inženýrství, 2018-12)As position information becomes more and more important in many fields of technology it is advantageous to recognize it in scenarios where satellite-based systems fail. Such a case is the scenario inside buildings where ... -
About Edge Detection in Digital Images
(Společnost pro radioelektronické inženýrství, 2018-12)Edge detection is one of the most commonly used procedures in digital image processing. In the last 30-40 years, many methods and algorithms for edge detection have been proposed. This article presents an overview of edge ... -
Direct Demodulation of Optical BPSK/QPSK Signals without Digital Signal Processing
(Společnost pro radioelektronické inženýrství, 2018-12)We experimentally demonstrate the coherent detection of 5-Gbd/s BPSK/QPSK signal by direct phase compensation of the phase noise without using a sophisticated digital signal processing algorithm. The phase compensation is ... -
Single and Dual-GPU Generalized Sparse Eigenvalue Solvers for Finding a Few Low-Order Resonances of a Microwave Cavity Using the Finite-Element Method
(Společnost pro radioelektronické inženýrství, 2018-12)This paper presents two fast generalized eigenvalue solvers for sparse symmetric matrices that arise when electromagnetic cavity resonances are investigated using the higher-order finite element method (FEM). To find a few ... -
A Novel Miniaturized Polarization Independent Frequency Selective Surface with UWB Response
(Společnost pro radioelektronické inženýrství, 2018-12)This study presents a novel Frequency Selective Surface (FSS) design with angularly stable and polarization independent band-stop response. The presented FSS comprises of miniaturized unit cells printed on two layers of ... -
Super High-Selectivity Fifth-Order Bandpass Filter with Twelve Transmission Zeros
(Společnost pro radioelektronické inženýrství, 2018-12)A fifth-order bandpass filter (BPF) with super high selectivity using three pairs of coupled lines and two open stubs is proposed. Twelve transmission zeros (TZs) from 0 to 2f_0 (f_0 denotes center frequency of the passband) ... -
A High Gain Dual Notch Compact UWB Antenna with Minimal Dispersion for Ground Penetrating Radar Application
(Společnost pro radioelektronické inženýrství, 2018-12)A compact (27.5×16.5×0.8 mm3) co-planar waveguide fed printed ultra-wideband antenna operating in the impedance band of 1.75-10.3 GHz with two wide frequency notch bands at 2.2–3.9 GHz and 5.1–6 GHz, is introduced. Dual ... -
The MIMO Antenna Array with Mutual Coupling Reduction and Cross-polarization Suppression by Defected Ground Structures
(Společnost pro radioelektronické inženýrství, 2018-12)This paper proposes two types of defected ground structures (DGSs) for achieving the mutual coupling (MC) reduction and the antenna cross-polarization (XP) suppression respectively in a MIMO (multiple input multiple output) ... -
Generalized Roughness Bearing Faults Diagnosis Based on Induction Motor Stator Current
(Společnost pro radioelektronické inženýrství, 2018-12)Despite their reliability, induction motors tend to fail. Around 41% of faults in motors are bearing related and that is the most common fault in motor field. Due to the lack of research on generalized roughness bearing ... -
A New Design for Compact Size Wireless Power Transfer Applications Using Spiral Defected Ground Structures
(Společnost pro radioelektronické inženýrství, 2018-12)In this article, a new wireless power transfer (WPT) design is proposed for improving the efficient of system. The suggested system contains two spiral defected ground structure (DGS) resonators coupled back-to-back. The ... -
TRL-based Measurement of Embedded Circuits in Microwave Printed Circuit Boards Including Frequency Conversion
(Společnost pro radioelektronické inženýrství, 2018-12)The paper deals with the measurement of individual components or circuits embedded in more complex radio frequency (RF) or microwave printed circuit board (PCBs). Since no standard RF measurement enables the direct parallel ... -
Mutual Coupling Reduction of Two 2x1 Triangular-Patch Antenna Array Using a Single Neutralization Line for MIMO Applications
(Společnost pro radioelektronické inženýrství, 2018-12)In this paper, a novel structure of two interlaced antenna arrays for MIMO applications is presented. It consists of two 2x1 triangular patch array antennas, which have all elements separated by a short distance among them ... -
Excitation of a Conducting Cylinder Using the Theory of Characteristic Modes
(Společnost pro radioelektronické inženýrství, 2018-12)This paper describes the application of the theory of characteristic modes to excite a conducting cylinder representing the chassis of a rocket. Mode excitation is achieved by cutting H-shaped slots on the cylinder at ... -
Chained-Function Filter Synthesis Based on the Modified Jacobi Polynomials
(Společnost pro radioelektronické inženýrství, 2018-12)A new class of filter functions with pass-band ripple which derives its origin from a method of determining the chained function lowpass filters described by Guglielmi and Connor is introduced. The closed form expressions ... -
Wideband Time Reversal of Microwave Signals Based on Phase Conjugating
(Společnost pro radioelektronické inženýrství, 2018-12)A phase conjugating network to realize wideband time reversal of microwave signals is studied in this paper. After discussions on the operation principle of the reversed signal in the time and frequency domains, a prototype ... -
A Compact Dual-Band Negative Group Delay Microwave Circuit
(Společnost pro radioelektronické inženýrství, 2018-12)A compact dual-band negative group delay circuit (NGDC) is proposed. The proposed NGDC is composed of an open-circuited transmission line and two resistors connected by two transmission lines. The frequency ratio is ... -
A Design of Microstrip Lowpass Filter with Wide Rejection Band and Sharp Transition Band Utilizing Semi-Circle Resonators
(Společnost pro radioelektronické inženýrství, 2018-12)In this paper, a microstrip lowpass filter with -3 dB cut-off frequency of 2.1 GHz consisting of three cascaded resonators with different semi-circle patches and four suppressors employing radial stubs has been proposed. ... -
Dual-Band Compact Metamaterial-Inspired Absorber with Wide Incidence Angle and Polarization Insensitivity for GSM and ISM Band Applications
(Společnost pro radioelektronické inženýrství, 2018-12)A dual-band metamaterial inspired microwave absorber composed of concentric two crossed double-arrow shaped resonators, ring resonator with four splits at the corners and square ring resonator is presented. The proposed ...