Browsing 2014/4 by Title
Now showing items 1-20 of 33
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3D Capturing with Monoscopic Camera
(Společnost pro radioelektronické inženýrství, 2014-12)This article presents a new concept of using the auto-focus function of the monoscopic camera sensor to estimate depth map information, which avoids not only using auxiliary equipment or human interaction, but also the ... -
A Broadband UHF Tag Antenna For Near-Field and Far-Field RFID Communications
(Společnost pro radioelektronické inženýrství, 2014-12)The paper deals with the design of passive broadband tag antenna for Ultra-High Frequency (UHF) band. The antenna is intended for both near and far fields Radio Frequency Identification (RFID) applications. The meander ... -
Concentrated Ground Plane Booster Antenna Technology for Multiband Operation in Handset Devices
(Společnost pro radioelektronické inženýrství, 2014-12)The current demand in the handset antenna field requires multiband antennas due to the existence of multiple communication standards and the emergence of new ones. At the same time, antennas with reduced dimensions are ... -
A Coplanar Waveguide Fed Hexagonal Shape Ultra Wide Band Antenna with WiMAX and WLAN Band Rejection
(Společnost pro radioelektronické inženýrství, 2014-12)In this paper, a coplanar waveguide (CPW) fed hexagonal shape planar antenna has been considered for ultra-wide band (UWB). This antenna is then modified to obtain dual band rejection. The Wireless Local Area Network (WLAN) ... -
A CPW-fed Triple-band Antenna for WLAN and WiMAX Applications
(Společnost pro radioelektronické inženýrství, 2014-12)In this letter, a compact printed antenna fed by coplanar waveguide for triple-band is presented. The proposed antenna consists of two rectangular metallic loops in front and a slit square ring on the backside. Tri-band ... -
Design of Dual-Band Two-Branch-Line Couplers with Arbitrary Coupling Coefficients in Bands
(Společnost pro radioelektronické inženýrství, 2014-12)A new approach to design dual-band two-branch couplers with arbitrary coupling coefficients at two operating frequency bands is proposed in this article. The method is based on the usage of equivalent subcircuits input ... -
Digital Demodulator for BFSK waveform based upon Correlator and Differentiator Systems
(Společnost pro radioelektronické inženýrství, 2014-12)The present article relates in general to digital demodulation of Binary Frequency Shift Keying (BFSK waveform) . New processing methods for demodulating the BFSK-signals are proposed here. Based on Sampler Correlator, the ... -
An Efficient Framework For Fast Computer Aided Design of Microwave Circuits Based on the Higher-Order 3D Finite-Element Method
(Společnost pro radioelektronické inženýrství, 2014-12)In this paper, an efficient computational framework for the full-wave design by optimization of complex microwave passive devices, such as antennas, filters, and multiplexers, is described. The framework consists of a ... -
Efficient Raw Signal Generation Based on Equivalent Scatterer and Subaperture Processing for SAR with Arbitrary Motion
(Společnost pro radioelektronické inženýrství, 2014-12)An efficient SAR raw signal generation method based on equivalent scatterer and subaperture processing is proposed in this paper. It considers the radar’s motion track, which can obtain the precise raw signal for the real ... -
Equivalent Circuit Modeling of the Dielectric Loaded Microwave Biosensor
(Společnost pro radioelektronické inženýrství, 2014-12)This article describes the modeling of biological tissues at microwave frequency using equivalent lumped elements. A microwave biosensor based on microstrip ring resonator (MRR), that has been utilized previously for meat ... -
Excessive Memory Usage of the ELLPACK Sparse Matrix Storage Scheme throughout the Finite Element Computations
(Společnost pro radioelektronické inženýrství, 2014-12)Sparse matrices are occasionally encountered during solution of various problems by means of numerical methods, particularly the finite element method. ELLPACK sparse matrix storage scheme, one of the most widely used ... -
First Order Sea Clutter Cross Section for HF Hybrid Sky-Surface Wave Radar
(Společnost pro radioelektronické inženýrství, 2014-12)This paper presents a modified method to simulate the first order sea clutter cross section for high frequency (HF) hybrid sky-surface wave radar, based on the existent model applied in the bistatic HF surface wave radar. ... -
Fractal Metamaterial Absorber with Three-Order Oblique Cross Dipole Slot Structure and its Application for In-band RCS Reduction of Array Antennas
(Společnost pro radioelektronické inženýrství, 2014-12)To miniaturize the perfect metamaterial absorber, a fractal three-order oblique cross dipole slot structure is proposed and investigated in this paper. The fractal perfect metamaterial absorber (FPMA) consists of two ... -
Fully CMOS Memristor Based Chaotic Circuit
(Společnost pro radioelektronické inženýrství, 2014-12)This paper demonstrates the design of a fully CMOS chaotic circuit consisting of only DDCC based memristor and inductance simulator. Our design is composed of these active blocks using CMOS 0.18 µm process technology with ... -
High-Isolation Dual-Polarized Microstrip Antenna via Substrate Integrated Waveguide Technology
(Společnost pro radioelektronické inženýrství, 2014-12)A dual-polarized microstrip antenna with high-isolation is proposed by the utilization of the substrate-integrated waveguide (SIW) technology. According to the SIW technology, the metalized holes (MHs) are inserted into ... -
An Improved Split-Step Wavelet Transform Method for Anomalous Radio Wave Propagation Modelling
(Společnost pro radioelektronické inženýrství, 2014-12)Anomalous tropospheric propagation caused by ducting phenomenon is a major problem in wireless communication. Thus, it is important to study the behavior of radio wave propagation in tropospheric ducts. The Parabolic Wave ... -
Invariance of the Null Distribution of the Multiple Coherence
(Společnost pro radioelektronické inženýrství, 2014-12)In this paper we investigate the invariance of the null distribution of the multiple coherence (MC) to the statistics of the examined signals. We show that when the MC is computed between a group of signals x_i[n], i=1,...,K ... -
Inverse Problem Solution in Landmines Detection Based on Active Thermography
(Společnost pro radioelektronické inženýrství, 2014-12)Landmines still affect numerous territories in the whole world and pose a serious threat, mostly to civilians. Widely used non-metallic landmines are undetectable using metal detector. Therefore, there is an urging need ... -
Low Voltage Floating Gate MOS Transistor Based Four-Quadrant Multiplier
(Společnost pro radioelektronické inženýrství, 2014-12)This paper presents a four-quadrant multiplier based on square-law characteristic of floating gate MOSFET (FGMOS) in saturation region. The proposed circuit uses square-difference identity and the differential voltage ... -
Measurement and Calibration of A High-Sensitivity Microwave Power Sensor with An Attenuator
(Společnost pro radioelektronické inženýrství, 2014-12)In this paper, measurement and calibration of a high-sensitivity microwave power sensor through an attenuator is performed using direct comparison transfer technique. To provide reliable results, a mathematical model ...