directional antenna


  • WordNet 3.6
    • n directional antenna an antenna that transmits or receives signals only in a narrow angle
    • ***


In literature:

The front pair of legs are much shorter, and these are often stretched directly forwards, so as to resemble antenna.
"The Malay Archipelago" by Alfred Russell Wallace
Meanwhile, a powerful transmitter and directional antenna had been set up at the hillside spot.
"Tom Swift and The Visitor from Planet X" by Victor Appleton
The insect can move its antennae in all directions because they are fastened to its head by ball-and-socket joints.
"The Insect Folk" by Margaret Warner Morley
Torulus: the basal socket joint of the antenna upon which the organ is articulated for movement in all directions.
"Explanation of Terms Used in Entomology" by John. B. Smith
As soon as this starts the antenna starts to send out energy in all directions, or "radiate" energy as we say.
"Letters of a Radio-Engineer to His Son" by John Mills
While thus engaged the antennae of the tiny fly were bent directly downward to the egg beneath.
"Butterflies Worth Knowing" by Clarence M. Weed
Then, antennae can be so constructed that messages can be received with most readiness from one particular direction.
"Marvels of Scientific Invention" by Thomas W. Corbin
He quietly touched Saggia with one of his antennae and waved the other in Nuova's direction.
"Nuova" by Vernon Kellogg
Under the threat of the curling antenna, Tommy and Dodd moved in the direction of the slowly circulating humans.
"Astounding Stories of Super-Science January 1930" by Victor Rousseau

In news:

The BlueSniper rifle for capturing data from Bluetooth-enabled phones is constructed from a Choate Ruger Mini-14 stock, 14dbi semi-directional Yagi antenna, standard rifle scope, electrical tape, zip ties and cardboard.
Laser direct structuring (LDS) is a powerful technology for adding electrical circuit paths to plastics electronic products such as mobile phone and notebook antennas or molded interconnect devices (MIDs).
Back in September, after a 19-year wait, the FCC approved the much-anticipated rules that will permit computer modeling of AM directional arrays as a means of directional antenna performance verification.
Designed for long-distance directional communication, the DB1-LP series of triband, log- periodic antennas operate from 824 to 960 MHz, 1.71 to 2.17 GHz, and 2.40 to 2.48 GHz.
A wildly complicated tangle of molecules, the FMO complex directs energy from photon-sensitive "antenna" proteins on a photosynthetic bacterium's surface to internal, charge-converting proteins.
The S2 full face is the only motorcycle helmet in the world with built-in FM and Bluetooth® antennas which plug directly into the SRC-System and enhance the communication distance between paired helmets as well as the FM radio reception.
A little known part of the Telecommunications Act of 1996 was drafted with the specific intent of allowing the installation of antennas to receive broadcasts, intended for direct reception by the public.
Using a 3D laser system, LDS technology allows the transfer of the antenna from CAD data directly onto a molded antenna carrier or even directly onto the device structure .
The path from the TV station to a viewer 's television set used to be simple and direct: transmit antenna to receive antenna.

In science:

The dipoles are positioned horizontally, resulting in a polarization along the East-West direction, as the antennas are orientated towards North.
The TIANSHAN Radio Experiment for Neutrino Detection
R2 cos θ sin2 θ, where c is the velocity of light, R the distance to the source and θ the angle between the source direction and ~d, the vector joining the two antennas.
The TIANSHAN Radio Experiment for Neutrino Detection
The antennas trigger times were then computed for each of these directions, and smeared afterward assuming a Gaussian time resolution.
The TIANSHAN Radio Experiment for Neutrino Detection
The direction reconstruction has been performed independently for the antenna and ground array data.
The TIANSHAN Radio Experiment for Neutrino Detection
The uncertainties for the antenna and ground array direction reconstructions are estimated using Equation A.7, by assuming a time resolution of 10 and 20 ns for the antennas and scintil lators respectively.
The TIANSHAN Radio Experiment for Neutrino Detection