Results 231 to 240 of about 303,910 (293)
Some of the next articles are maybe not open access.
2020
One of the simple and most widely used microwave antennas is the horn as a feed element for large radio telescopes, satellite tracking, and communication reflector, which are found installed throughout the world. In addition to its utility as a feed for reflectors and lenses, it is a common element of phased arrays and serves as a universal standard ...
openaire +1 more source
One of the simple and most widely used microwave antennas is the horn as a feed element for large radio telescopes, satellite tracking, and communication reflector, which are found installed throughout the world. In addition to its utility as a feed for reflectors and lenses, it is a common element of phased arrays and serves as a universal standard ...
openaire +1 more source
Pattern-Reconfigurable Water Horn Antenna
IEEE Transactions on Antennas and Propagation, 2021A novel horn antenna is reported in this communication, which is realized by using water walls instead of traditional metallic walls. Due to its fluidity, water filling different channels can be readily controlled. Therefore, the proposed water horn antenna can operate in two states: H-plane horn state and leaky-wave state, resulting in different ...
Zhen Ren +3 more
openaire +2 more sources
IEEE Transactions on Antennas and Propagation, 1971
Preliminary results obtained from an investigation of the impedance and radiation properties of a novel broadband linearly polarized antenna called the rudimentary horn are reported. When properly designed the antenna is found to be capable of maintaining its desirable radiation and impedance characteristics over a 10:1 band of frequencies.
D. Sengupta, J. Ferris
openaire +1 more source
Preliminary results obtained from an investigation of the impedance and radiation properties of a novel broadband linearly polarized antenna called the rudimentary horn are reported. When properly designed the antenna is found to be capable of maintaining its desirable radiation and impedance characteristics over a 10:1 band of frequencies.
D. Sengupta, J. Ferris
openaire +1 more source
IEEE Transactions on Antennas and Propagation, 2007
Antennas for radiating high-power mesoband (medium-bandwidth) electromagnetic signals are critical to the mission of upsetting electronics at a distance. When operated at frequencies of a few hundred megahertz, RF weapons require highly efficient antennas that can fit into a small volume.
E.G. Farr +3 more
openaire +1 more source
Antennas for radiating high-power mesoband (medium-bandwidth) electromagnetic signals are critical to the mission of upsetting electronics at a distance. When operated at frequencies of a few hundred megahertz, RF weapons require highly efficient antennas that can fit into a small volume.
E.G. Farr +3 more
openaire +1 more source
QCL with terahertz TEM-Horn Antennas
2007 Joint 32nd International Conference on Infrared and Millimeter Waves and the 15th International Conference on Terahertz Electronics, 2007Quantum Cascade Lasers are one the most promising approach for the generation of THz waves and particularly in a double plasmon waveguide topology. Stripline resonators with a quasi-TEM mode are indeed interesting for THz-QCLs thanks to a high confinement factor combined with low losses.
Akalin, Tahsin +8 more
openaire +1 more source
IEEE Antennas and Propagation Magazine, 1990
The construction and history of the calibration horn antenna, a large standard-gain horn at the National Radio Astronomy Observatory, Green Bank, West Virginia, are discussed. Construction of the horn began in 1958. Its purpose was to make absolute measurements by observing a strong source directly with a standard-gain horn antenna.
openaire +1 more source
The construction and history of the calibration horn antenna, a large standard-gain horn at the National Radio Astronomy Observatory, Green Bank, West Virginia, are discussed. Construction of the horn began in 1958. Its purpose was to make absolute measurements by observing a strong source directly with a standard-gain horn antenna.
openaire +1 more source
Photonic crystal horn and array antennas
Physical Review E, 2003We introduce a defect-based horn antenna in a two-dimensional photonic crystal. Our numerical simulations demonstrate the efficient, highly directional nature of the antenna. It has a large operating bandwidth, low loss, and an operating frequency that is scalable to various regions of the electromagnetic spectrum.
Andrew R, Weily +2 more
openaire +2 more sources
Proceedings of the IRE, 1953
Formulas are derived for the E- and H-plane radiation patterns of antennas fed by horns as functions of illumination taper. The case of a single lens or reflector antenna fed by two contiguous horns stacked in either one of the principal planes is then investigated.
openaire +1 more source
Formulas are derived for the E- and H-plane radiation patterns of antennas fed by horns as functions of illumination taper. The case of a single lens or reflector antenna fed by two contiguous horns stacked in either one of the principal planes is then investigated.
openaire +1 more source
2005
In this work the basic theory of circular corrugated horn antennas is presented, using easy concepts with simple mathematics. The aim is to give the reader an understanding of the fundamental electromagnetic properties of these devices and to provide a set of quantitative design tools for the electromagnetic engineer.
L. Lucci +3 more
openaire +1 more source
In this work the basic theory of circular corrugated horn antennas is presented, using easy concepts with simple mathematics. The aim is to give the reader an understanding of the fundamental electromagnetic properties of these devices and to provide a set of quantitative design tools for the electromagnetic engineer.
L. Lucci +3 more
openaire +1 more source
In this work, the basic theory of circular corrugated horn antennas is presented, using easy concepts with simple mathematics. The aim is to give the reader an understanding of the fundamental electromagnetic properties of these devices and to provide a set of quantitative design tools for the electromagnetic engineer.
Gian Guido Gentili +3 more
openaire +1 more source
Gian Guido Gentili +3 more
openaire +1 more source