Results 11 to 20 of about 190,091 (88)

A monopole antenna at optical frequencies: single-molecule near-field measurements [PDF]

open access: yes, 2007
We present a monopole antenna for optical frequencies (~600 THz) and discuss near-field measurements with single fluorescent molecules as a technique to characterize such antennas.
Hulst, Niek F. van   +2 more
core   +4 more sources

Antenna Design and Implementation for the Future Space Ultra-Long Wavelength Radio Telescope [PDF]

open access: yes, 2018
In radio astronomy, the Ultra-Long Wavelengths (ULW) regime of longer than 10 m (frequencies below 30 MHz), remains the last virtually unexplored window of the celestial electromagnetic spectrum.
Aminaei, Amin   +6 more
core   +4 more sources

Comprehensive design and propagation study of a compact dual band antenna for healthcare applications [PDF]

open access: yes, 2015
In this paper, a dual band planar inverted F antenna (PIFA) has been investigated for cooperative on- and off-body communications. Free space and on-body performance parameters like return loss, bandwidth, radiation pattern and efficiency of this antenna
Abbasi, Qammer H.   +2 more
core   +2 more sources

Reconfigurable wideband patch antenna for cognitive radio [PDF]

open access: yes, 2009
Cognitive radio communication is envisaged to be a new paradigm of methodologies for enhancing the performance of radio communication systems through the efficient utilization of radio spectrum.
AbuTarboush, H.F.   +9 more
core   +2 more sources

Calibration of the Logarithmic-Periodic Dipole Antenna (LPDA) Radio Stations at the Pierre Auger Observatory using an Octocopter [PDF]

open access: yes, 2017
An in-situ calibration of a logarithmic periodic dipole antenna with a frequency coverage of 30 MHz to 80 MHz is performed. Such antennas are part of a radio station system used for detection of cosmic ray induced air showers at the Engineering Radio ...
Aab, A.   +404 more
core   +3 more sources

In-flight calibration of STEREO-B/WAVES antenna system [PDF]

open access: yes, 2014
The STEREO/WAVES (SWAVES) experiment on board the two STEREO spacecraft (Solar Terrestrial Relations Observatory) launched on 25 October 2006 is dedicated to the measurement of the radio spectrum at frequencies between a few kilohertz and 16 MHz.
B. Cecconi   +33 more
core   +1 more source

Energy efficiency of transmit diversity systems under a realistic power consumption model [PDF]

open access: yes, 2013
We compare the downlink energy efficiency of spatial diversity multiple transmit antenna schemes. We determine the minimum required transmit power for a given outage probability.
Brante, G.   +3 more
core   +1 more source

Experimental study of on-body radio channel performance of a compact ultra wideband antenna [PDF]

open access: yes, 2015
In this paper, on-body radio channel performance of a compact ultra wideband (UWB) antenna is investigated for body-centric wireless communications.
Abbasi, Qammer H.   +3 more
core   +1 more source

DSS-13 26-meter antenna upgraded radiometer system [PDF]

open access: yes, 1992
The Deep Space Station (DSS)-13 26-m antenna radiometer system was upgraded with an IBM-compatible computer-controlled configuration with improved supporting hardware and software.
Bury, G., Skjerve, L., Stelzried, C. T.
core   +1 more source

Foldable all-textile cavity-backed slot antennas for personal UWB localization [PDF]

open access: yes, 2020
An all-textile multimoded cavity-backed slot antenna has been designed and fabricated for body-worn impulse radio ultra-wideband (IR-UWB) operation in the 3,744-4,742.4 MHz frequency band, thereby covering Channels 2 and 3 of the IEEE 802.15.4a standard.
Lemey, Sam   +4 more
core   +1 more source

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