Results 251 to 260 of about 19,811 (315)

A Hepta-band Frequency Tunable Patch Antenna for Cognitive Radio Applications

Vijayluxmi Meena, Prem Pal Singh, Sudhir Kumar Sharma, Ravi Gupta   +3 more
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An experimental dataset using UAVs and LoRa technology in avalanche scenarios. [PDF]

Data Brief
Mavilia F, La Rosa D, Berton A, Girolami M.   +3 more
europepmc   +1 more source

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Personal radio antennas

IRE Transactions on Vehicular Communications, 1961
The trend toward personalizing vehicular radio sets has been accompanied by major engineering problems. Of these, one of the most challenging is that of designing an efficient antenna to occupy a small space. Due to these size limitations, personal radio antennas will be referred to as small antennas.
N. H. Shepherd, W. G. Chaney
openaire   +1 more source

Radio frequency radiation (RFR) from radio antennas

2003 IEEE International Symposium on Electromagnetic Compatibility, 2003. EMC '03., 2003
For the last 30 years, biological effects of non-ionizing radiation (NIR: 0-300 GHz) has got the top position in the scientific area, since a large population of the people are exposed to these fields. In this study, we evaluated the radio frequency radiation (RFR) at a pilot region located in Yenimahalle Sentepe Dededoruk Hill, in Ankara, Turkey ...
Seyhan, N, Sirav, B
openaire   +2 more sources

Radio Characteristics of Antennas

2021
The tasks solved by antennas in radio systems are listed. The structure of electromagnetic fields excited by the antenna in the near and far zones is considered. The definitions of the internal and external parameters of transmitting and receiving antennas are given.
Vadim Serafimovich Kalashnikov, Maxim Yurievich Ponomarev, Oleg Yurievich Platonov, Victor Vasilievich Shubnikov, Mark Ilyich Rivkin, Artem Yurievich Shatrakov, Yury Grigorievich Shatrakov, Oleg Ivanovich Zavalishin   +7 more
openaire   +1 more source

Radio-Telescope Antenna Parameters

IEEE Transactions on Military Electronics, 1964
Principal antenna parameters which are useful in characterizing the electrical performance of radio-telescope antennas are defined and the relations between them are established. The application of these parameters to radio astronomical measurements is discussed.
openaire   +1 more source

Saddle antenna radio frequency ion sources

Review of Scientific Instruments, 2015
Existing RF ion sources for accelerators have specific efficiencies for H+ and H− ion generation ∼3–5 mA/cm2 kW, where about 50 kW of RF power is typically needed for 50 mA beam current production. The Saddle Antenna (SA) surface plasma source (SPS) described here was developed to improve H− ion production efficiency, reliability, and availability.
V, Dudnikov, R, Johnson, S, Murray, T, Pennisi, M, Santana, C, Piller, M, Stockli, R, Welton, J, Breitschopf, G, Dudnikova   +9 more
openaire   +2 more sources

Introduction to radio and radio antennas

IEEE Spectrum, 1971
Electromagnetic wave propagation is a simple and beautiful phenomenon, but its rigorous mathematical derivation from Maxwell's equations is formidable. This article makes many of the concepts visible and plausible using only mathematics available to college freshmen and taught today in most high schools.
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Trees performing as radio antennas

IEEE Transactions on Antennas and Propagation, 1975
Radio transmission and reception experiments conducted in a tropical jungle are described. The performance of conventional whip antennas is compared with the performance of trees utilized as antennas in conjunction with hybrid electromagnetic antenna couplers (HEMAC's). The trees were found to outperform the whip in some cases by up to 20 dB.
K. Ikrath, W. Kennebeck, R. Hoverter
openaire   +1 more source