2008/2
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Enhanced Coupling Values in Coupled Microstrip Lines using Metamaterials
(Společnost pro radioelektronické inženýrství, 2008-06)In this paper, we show how metamaterials can be used to enhance the coupling values of microstrip directional couplers. Coupling between regular coplanar microstrip lines, in fact, is limited, due to the small ratios between ... -
MIMO Capacity Estimation at 2 GHz with a Ray Model in Urban Cellular Environment
(Společnost pro radioelektronické inženýrství, 2008-06)MIMO technology promises a linear increase of capacity in function of the minimum antenna number at the transmitter and at the receiver. In order to test if these performances can be actually met in mobile communications, ... -
The Use of the Fluorescence to the Study of the Water Quality
(Společnost pro radioelektronické inženýrství, 2008-06)We present a work proposal now in course that is based on the study of the fluorescence in cyanobacteria and toxicity, and the possibility of detecting their presence in freshwater environment, with a direct application ... -
On Using Ray-Launching Method for Modeling Rotational Spectrometer
(Společnost pro radioelektronické inženýrství, 2008-06)In this paper the ray-launching method is developed and used for the modeling of a rotational spectrometer. Since the electrical size of the spectrometer is several thousands times longer compared to the wavelength, the ... -
Small H-shaped Shorted Patch Antennas
(Společnost pro radioelektronické inženýrství, 2008-06)Four H-shaped shorted patch antennas with reduced dimensions are developed by using several techniques for size reduction of patch antennas. Step-by-step approach shows the obtainable reduction in size. All antennas are ... -
Regularized Image Reconstruction for Ultrasound Attenuation Transmission Tomography
(Společnost pro radioelektronické inženýrství, 2008-06)The paper is focused on ultrasonic transmission tomography as a potential medical imaging modality, namely for breast cancer diagnosis. Ultrasound attenuation coefficient is one of the tissue parameters which are related ... -
THz Wave Propagation on Strip Lines: Devices, Properties, and Applications
(Společnost pro radioelektronické inženýrství, 2008-06)We report the propagation characteristics of THz pulses on micro-strip-lines and coplanar strip-lines, in which low permittivity polymer materials are used as the dielectric layer or the substrate. As a result of the low ... -
Patch Antenna Based on Metamaterials for a RFID Transponder
(Společnost pro radioelektronické inženýrství, 2008-06)In this paper a self-diplexed antenna is proposed for a RFID transponder application. The development cycle is divided into two stages: antenna design and filters design. The antenna is based on a square microstrip patch ... -
Fiber-Optic Vibration Sensor Based on Multimode Fiber
(Společnost pro radioelektronické inženýrství, 2008-06)The purpose of this paper is to present a fiberoptic vibration sensor based on the monitoring of the mode distribution in a multimode optical fiber. Detection of vibrations and their parameters is possible through observation ... -
Simplified Frame and Symbol Synchronization for 4–CPFSK with h=0.25
(Společnost pro radioelektronické inženýrství, 2008-06)This paper examines the problem of rapid frame and symbol synchronization techniques intended particularly for constant envelope modulation formats M–CPFSK with modulation index h=1/M which are used in strictly bandwidth ... -
Simple and Low-Cost Realization of RDS Encoder
(Společnost pro radioelektronické inženýrství, 2008-06)This paper presents a simple and easy way of realization of RDS encoder. Autonomous equipment which is capable to generate wanted data stream, modulate that data stream and mixed generated signal with stereo or mono FM ... -
Local Positioning Services on IEEE 802.11 Networks
(Společnost pro radioelektronické inženýrství, 2008-06)This paper deals with localization services in IEEE 802.11 networks, for indoor environment. The proposed solution processes the Time Of Arrival of location packets sent by a Mobile Terminal, that makes access in a IEEE ... -
Fast Analysis of Stop-Band FSS Integrated with Phased Array Antennas
(Společnost pro radioelektronické inženýrství, 2008-06)This paper presents a method for the efficient analysis of multilayer frequency selective surfaces (FSSs) integrated with phased array of open-ended waveguides. The method is based on the assumption that all the periodic ... -
Terminal Antennas in ACE2
(Společnost pro radioelektronické inženýrství, 2008-06)The ACE Network of Excellence was a European Commission funded Network of Excellence, which lasted from 2004 to 2007. One of the activities performed by this Network was in the frame of terminal antennas. In this activity, ... -
Broadband SHF Direction-Finder
(Společnost pro radioelektronické inženýrství, 2008-06)The original design of the compact broadband direction-finder is presented in this paper. The cylindrical monopole antenna serves as a primary source of the reflector- type antenna. \"Zero-amplitude\" technique is used for ... -
Wide-Angle X-Band Antenna Array with Novel Radiating Elements
(Společnost pro radioelektronické inženýrství, 2008-06)An antenna array with wide-angle beam steering is presented in this paper. The antenna consists of dielectrically filled open-ended waveguides with a new type of excitation as individual radiators. The characteristics of ... -
User Interaction with Inverted-F Antennas Integrated into Laptop PCMCIA Cards
(Společnost pro radioelektronické inženýrství, 2008-06)This paper evaluates the overall laptop integration effects on the performance of commercial 2.4 GHz Inverted-F antennas built into PCMCIA cards. A generic laptop model is used to represent the antenna housing effects while ... -
Diversity and MIMO Performance Evaluation of Common Phase Center Multi Element Antenna Systems
(Společnost pro radioelektronické inženýrství, 2008-06)The diversity and Multiple Input Multiple Output (MIMO) performance provided by common phase center multi element antenna (CPCMEA) systems is evaluated using two practical methods which make use of the realized active ... -
Analysis of Highly Directive Cavity-Type Configurations Comprising of Low Profile Antennas Covered by Superstrates
(Společnost pro radioelektronické inženýrství, 2008-06)In this paper we present a technique for designing antenna/superstrate composites to produce enhanced directivities. As a first step, we study the underlying mechanism that governs the performance of theses antennas by ... -
Contactless Area Measurement (Contactless Planimeter)
(Společnost pro radioelektronické inženýrství, 2008-06)The paper describes the designed hardware and software systems (so-called planimeters) for contactless measurement of areas (eventually geometric distances between two selected points) of planar projections of various ...
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