Browsing 2018/4 by Title
Now showing items 1-20 of 37
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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 ... -
Analysis of Plane Waves Spectra in a Weakly-Disturbed Flat Reverberation Chamber by Information Theory Criteria
(Společnost pro radioelektronické inženýrství, 2018-12)This work aims to present the impact of disturbing the stationary modes in a rectangular-shaped reverberation chamber by small-dimensioned stirrers. The study focuses on plane wave’s modeling of the electric field inside ... -
Bit Error Probability of M-QAM under Impulsive Noise and Fading Modeled by Markov Chains
(Společnost pro radioelektronické inženýrství, 2018-12)This article presents new exact expressions, written in terms of elementary transcendental functions, for calculating the bit error probability of M-ary Quadrature Amplitude Modulation (M-QAM) scheme considering the wireless ... -
Broadband Compact Single-Layer Magic-T Junction with Separation of DC Signals between All Ports
(Společnost pro radioelektronické inženýrství, 2018-12)A novel structure for a four-port microstrip magic-T junction is presented. The device is composed of microstrip and slotline circuits etched onto two sides of a dielectric substrate. The device is extremely compact and ... -
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 ... -
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 ... -
Compact Electronically Reconfigurable WiMAX Band- Notched Ultra-wideband MIMO Antenna
(Společnost pro radioelektronické inženýrství, 2018-12)A low-profile electronically reconfigurable WiMAX band-notched dual port multiple-input multipleoutput (MIMO) antenna design for ultra-wideband application has been presented. The two symmetrical MIMO antenna elements ... -
A Compact WiMAX Band-Notched UWB MIMO Antenna with High Isolation
(Společnost pro radioelektronické inženýrství, 2018-12)A multiple-input-multiple-output (MIMO) antenna is proposed for ultra-wideband (UWB) applications with high isolation capability. The proposed MIMO structure consists of two simple square monopole antennas with slotted ... -
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. ... -
Design of Miniaturized Dual-Band Wilkinson Power Divider Using Dual and Cascade Pi-Shaped Transmission Lines
(Společnost pro radioelektronické inženýrství, 2018-12)This paper presents a design of compact dual-band Wilkinson power divider (WPD). The cascaded pi-shape and dual transmission lines are used instead of conventional transmission line sections of the reference WPD in order ... -
Determination of Base Station Emission Power Change in a Mobile Network Cell with Movable Users
(Společnost pro radioelektronické inženýrství, 2018-12)This paper considers base transceiver station (BTS) emission power change in the cell-organized mobile network with dynamic power control, due to users’ moving. Such power adjustment contributes to energy saving and ... -
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 ... -
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 ... -
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 ... -
Efficient Procedure Improving Precision of High Conditioned Matrices in Electronic Circuits Analysis
(Společnost pro radioelektronické inženýrství, 2018-12)In this article, we propose several improvements that could be done to SPICE simulator. The first is based on a functional implementation of device models. The advantages of functional implementation are demonstrated on ... -
Evaluation of EEG-based Complementary Features for Assessment of Visual Discomfort based on Stable Depth Perception Time
(Společnost pro radioelektronické inženýrství, 2018-12)The investigation aimed at the evaluation of EEG activity during stereoscopic perception of images with different levels of visual comfort. Different levels of disparity and the number of details in stereoscopic views in ... -
Evaluation of Planar Elliptical Antenna Array with Inner Counter-elliptical Slot
(Společnost pro radioelektronické inženýrství, 2018-12)This paper presents and analyzes a low profile planar antenna array of elliptical elements with inner counter-elliptical slots. The antenna has single feed and provides two main directive radiation components (front and ... -
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 ... -
FBMC Transmitters with Reduced Complexity
(Společnost pro radioelektronické inženýrství, 2018-12)Filter Bank MultiCarrier (FBMC) modulation is currently considered as one of the key enablers for future 5G technologies. In the literature, two approaches are applied for the modulation of FBMC signals: Frequency Spreading ... -
Floating Hemispherical Helical Antenna: Analysis of Gain, Efficiency and Resonant Frequency
(Společnost pro radioelektronické inženýrství, 2018-12)This paper reports the effect of seawater conductivity on gain, efficiency and resonant frequency of a hemispherical helical antenna. The size of the copper ground plane for the hemispherical antenna can be reduced using ...