Results 271 to 280 of about 19,811 (315)

Reconfigurable antennas for cognitive radio

2011 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications, 2011
The paper reviews the requirements for antennas for use in cognitive radio systems, and presents a summary of some recent developments and future trends in this area.
P. Gardner, P. S. Hall, M.R. Hamid, F. Ghanem   +3 more
openaire   +1 more source

Wideband Antenna for Portable Radio

2008 International Workshop on Antenna Technology: Small Antennas and Novel Metamaterials, 2008
Narrow frequency bandwidth antenna is a typical shortcoming for most of the communication devices. Thus, a single radiating element which able to have resonant frequencies covering from 780MHz till 3000MHz with at least VSWR of 2.5:1 is critically needed especially for a mission critical two-way portable radio.
BoonPing Koh, SooLiam Ooi, KokHui Tan
openaire   +1 more source

Wideband antennas for radio astronomy

2006 First European Conference on Antennas and Propagation, 2006
The global radio astronomy community has for the last several years embarked on an exciting project known as Square Kilometer Array (SKA). This project is a radio telescope operational from 0.1GHz to 25GHz, with a square kilometer of overall collecting area, providing an increase in sensitivity of two orders of magnitude.
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Radio Antenna Aspiration

The Annals of Thoracic Surgery, 2012
Ozbudak, E, Akgul, AG, Liman, ST, Topcu, SALİH, Elicora, AYKUT   +4 more
openaire   +3 more sources

On geometry of radio antenna placements

1998
A smooth planar curve \(x(t)\) is said to have unique differences if all the vectors \(x(t)- x(t')\) that correspond to different pairs \((t,t')\), \(t\neq t'\), are different. In this note it is proved that if a smooth planar curve has unique differences, then it is a convex curve.
Kosheleva, Olga, Kreinovich, Vladik, Finkelstein, Andrei M., Chan, Steve   +3 more
openaire   +1 more source

Antennas for digital radio broadcast

Ninth International Conference on Antennas and Propagation (ICAP), 1995
The Digital Radio Broadcast is reviewed briefly and the gain, polarization and other electrical requirements of mobile antennas for direct satellite signal reception, or terrestrial broadcast signals is discussed. Low profile and low cost antenna candidates in the form of multifilar helices and microstrip type radiators are introduced and compared. >
openaire   +1 more source

ANTENNA DEVICE FOR RADIO TELEPHONES

2007
The aim of the invention is to technically improve an antenna device for radio telephones, based on a printed circuit board antenna or a strip conductor antenna, in such a way that it is economical and simple to produce and has a high efficiency, but nevertheless ensures that the user of the radio telephone is less exposed to the effects of ...
SIEMENS AG, GAPSKI DIETMAR, HERRMANN STEPHAN   +2 more
openaire   +1 more source

Antennas for Mobile Radio Systems

2004
Transmission and reception of radio waves require antennas. In providing gateways to transmission and reception of radio signals, antennas play important roles both at the base station and mobile terminal. Though, higher transmit power and greater receiver sensitivity can improve radio link quality and reliability, the regulatory authorities place a ...
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Antenna Combined with Radio Tuner

SAE Technical Paper Series, 1988
<div class="htmlview paragraph">Since the introduction of the car radio, reception quality has been less than perfect. Currently, audio reception is accomplished with a co-axial cable between the antenna and radio tuner. Unfortunately this system looses transmission in various ways.</div> <div class="htmlview paragraph">Today we will ...
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Cosmology with the Laser Interferometer Space Antenna

Living Reviews in Relativity, 2023
Germano Nardini
exaly