- Industry: Telecommunications
- Number of terms: 29235
- Number of blossaries: 0
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ATIS is the leading technical planning and standards development organization committed to the rapid development of global, market-driven standards for the information, entertainment and communications industry.
An antenna composed of a relatively large number of usually identical elements arranged in a single line or in a plane with uniform spacing and usually with a uniform feed system.
Industry:Telecommunications
An antenna configuration in which the transmitting antenna is oriented to produce a vertical radiation pattern, and a flat or off-axis parabolic reflector, mounted above the transmitting antenna, is used to direct the beam in a horizontal path toward the receiving antenna. Note: A periscope antenna facilitates increased terrain clearance without long transmission lines, while permitting the active equipment to be located at or near ground level for ease of maintenance.
Industry:Telecommunications
An antenna consisting of a parabolic reflector and a radiating or receiving element at or near its focus. Note: If the reflector is in the shape of a paraboloid of revolution, it is called a paraboloidal reflector; cylindrical paraboloids and off-axis paraboloids of revolution are also used.
Industry:Telecommunications
An antenna consisting of an arrangement of multiple dipole antennas. Note: Various directivity patterns may be obtained by varying the arrangement of the dipoles and the way they are driven.
Industry:Telecommunications
An antenna consisting of two conical conductors, having a common axis and vertex, and extending in opposite directions. Note 1: In a biconical antenna, excitation is applied at the common vertex. Note 2: If one of the cones is reduced to a plane, the antenna is called a discone.
Industry:Telecommunications
An antenna designed to have an approximately constant input impedance over a wide range of frequencies. Note: Examples of aperiodic antennas include terminated rhombic antennas and wave antennas. Synonym nonresonant antenna.
Industry:Telecommunications
An antenna designed to have an approximately constant input impedance over a wide range of frequencies. Note: Examples of aperiodic antennas include terminated rhombic antennas and wave antennas. Synonym nonresonant antenna.
Industry:Telecommunications
An antenna in which all of the elements, both active and parasitic, are in one plane. Note 1: A planar array provides a large aperture and may be used for directional beam control by varying the relative phase of each element. Note 2: A planar array may be used with a reflecting screen behind the active plane.
Industry:Telecommunications
An antenna in which the feed radiator is mounted at or near the surface of a concave main reflector and is aimed at a convex secondary reflector slightly inside the focus of the main reflector. Note 1: Energy from the feed unit illuminates the secondary reflector, which reflects it back to the main reflector, which then forms the desired forward beam. Note 2: The Cassegrain antenna design is adapted from optical telescope technology and allows the feed radiator to be more easily supported.
Industry:Telecommunications
An antenna in which the radiation pattern is not omnidirectional, i.e., a nonisotropic antenna.
Industry:Telecommunications
