Now showing items 1-10 of 16
Interference Suppression Performance of Automotive UWB Radars Using Pseudo Random Sequences
(Společnost pro radioelektronické inženýrství, 2015-12)
Ultra wideband (UWB) automotive radars have attracted attention from the viewpoint of reducing traffic accidents. The performance of automotive radars may be degraded by interference from nearby radars using the same ...
Vivaldi Antenna for RF Energy Harvesting
(Společnost pro radioelektronické inženýrství, 2016-12)
Energy harvesting is a future technology for capturing ambient energy from the environment to be recycled to feed low-power devices. A planar antipodal Vivaldi antenna is presented for gathering energy from GSM, WLAN, UMTS ...
Optimization of Transient Response Radiation of Printed Ultra Wideband Dipole Antennas (Using Particle Swarm Optimization Method)
(Společnost pro radioelektronické inženýrství, 2007-06)
In case of particular ultra wideband applications (i.e. radar, positioning, etc.), it is crucial to know the transient responses of antennas. In the first part of the paper, the optimization process searches for the dipole ...
Comparative Evaluation of UMTS, WLAN, BWA, MBWA, and UWB Systems
(Společnost pro radioelektronické inženýrství, 2003-12)
UMTS, WLAN, BWA and UWB systems are compared in this paper. The comparative analysis covers system capacity, QoS, and radiowave propagation.
Impact of Ultra Wide Band (UWB) on Macrocell Downlink of DCS-1800 and GSM-900 Systems
(Společnost pro radioelektronické inženýrství, 2005-04)
The effect of UWB interference on the DCS-1800 and GSM-900 downlink is studied for different UWB power density. For high UWB power density (-70 dBm/MHz), the effect of UWB signals is very high when the distance between UWB ...
Dispersion and Pulse Interferences Investigation for UWB Signal Propagation
(Společnost pro radioelektronické inženýrství, 2008-09)
The Ultra WideBand (UWB) technology utilizing nanosecond pulses has been one of the main phenomena in communications and radar applications for several years. This paper discusses the basic measurement techniques of impulse ...
A Self-Complementary 1.2 to 40 GHz Spiral Antenna with Impedance Matching
(Společnost pro radioelektronické inženýrství, 2006-09)
This paper describes a design of the Self- Complementary Spiral Antenna (SCSA) which consists of a spiral antenna and a wideband impedance transformer. The spiral antenna and the transformer are designed separately due to ...
A Planar UWB Antenna with Switchable Single/Double Band-Rejection Characteristics
(Společnost pro radioelektronické inženýrství, 2016-09)
In this Paper, a reconfigurable antenna with capability to operate in the ultrawideband (UWB) mode from 2.85 to 14.4 GHz with switchable notch bands of 3.25–4.26 GHz, 5.1–5.9 GHz or 7.1-7.8 GHz, is presented. The proposed ...
Slotted Printed Monopole UWB Antennas with Tunable Rejection Bands for WLAN/WiMAX and X-Band Coexistence
(Společnost pro radioelektronické inženýrství, 2018-09)
Four versions of the compact hexagonal-shaped monopole printed antennas for UWB applications are presented. The first proposed antenna has an impedance bandwidth of 127.48 % (3.1 GHz to 14 GHz), which satisfies the bandwidth ...
Wall Compensation for Ultra Wideband Applications
(Společnost pro radioelektronické inženýrství, 2012-06)
Due to their low frequency contents, ultra wideband (UWB) signals have the ability to penetrate walls and obstacles. As the signal propagates through these obstacles, it gets attenuated, slows down, and gets dispersed. ...