Cassegrain antenna, the Glossary
In telecommunications and radar, a Cassegrain antenna is a parabolic antenna in which the feed antenna is mounted at or behind the surface of the concave main parabolic reflector dish and is aimed at a smaller convex secondary reflector suspended in front of the primary reflector.[1]
Table of Contents
32 relations: Altazimuth mount, Antenna (radio), Antenna feed, Beam diameter, Beam waveguide antenna, Cassegrain reflector, Communications satellite, Curved mirror, F-number, Feed horn, Focal length, Focus (geometry), Focus (optics), Gain (antenna), Ground loop (electricity), Ground station, Hyperboloid, Laurent Cassegrain, NASA, NASA Deep Space Network, Nasmyth telescope, Noise temperature, Parabolic antenna, Parabolic reflector, Paraboloid, Radar, Radio telescope, Reflecting telescope, RF front end, Sidelobes, Telecommunications, Voyager program.
Altazimuth mount
An altazimuth mount or alt-azimuth mount is a simple two-axis mount for supporting and rotating an instrument about two perpendicular axes – one vertical and the other horizontal.
See Cassegrain antenna and Altazimuth mount
Antenna (radio)
In radio engineering, an antenna (American English) or aerial (British English) is the interface between radio waves propagating through space and electric currents moving in metal conductors, used with a transmitter or receiver. Cassegrain antenna and antenna (radio) are antennas (radio).
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Antenna feed
A radio transmitter or receiver is connected to an antenna which emits or receives the radio waves.
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Beam diameter
The beam diameter or beam width of an electromagnetic beam is the diameter along any specified line that is perpendicular to the beam axis and intersects it. Cassegrain antenna and beam diameter are antennas (radio).
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Beam waveguide antenna
A beam waveguide antenna is a particular type of antenna dish, at which waveguides are used to transmit the radio beam between the large steerable dish and the equipment for reception or transmission, like e.g. RF power amplifiers. Cassegrain antenna and beam waveguide antenna are antennas (radio) and radio frequency antenna types.
See Cassegrain antenna and Beam waveguide antenna
Cassegrain reflector
The Cassegrain reflector is a combination of a primary concave mirror and a secondary convex mirror, often used in optical telescopes and radio antennas, the main characteristic being that the optical path folds back onto itself, relative to the optical system's primary mirror entrance aperture. Cassegrain antenna and Cassegrain reflector are antennas (radio) and radio frequency antenna types.
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Communications satellite
A communications satellite is an artificial satellite that relays and amplifies radio telecommunication signals via a transponder; it creates a communication channel between a source transmitter and a receiver at different locations on Earth.
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Curved mirror
A curved mirror is a mirror with a curved reflecting surface.
See Cassegrain antenna and Curved mirror
F-number
An f-number is a measure of the light-gathering ability of an optical system such as a camera lens.
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Feed horn
A feed horn (or feedhorn) is a small horn antenna used to couple a waveguide to e.g. a parabolic dish antenna or offset dish antenna for reception or transmission of microwaves. Cassegrain antenna and feed horn are antennas (radio) and radio frequency antenna types.
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Focal length
The focal length of an optical system is a measure of how strongly the system converges or diverges light; it is the inverse of the system's optical power.
See Cassegrain antenna and Focal length
Focus (geometry)
In geometry, focuses or foci (focus) are special points with reference to which any of a variety of curves is constructed.
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Focus (optics)
In geometrical optics, a focus, also called an image point, is a point where light rays originating from a point on the object converge.
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Gain (antenna)
In electromagnetics, an antenna's gain is a key performance parameter which combines the antenna's directivity and radiation efficiency. Cassegrain antenna and gain (antenna) are antennas (radio).
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Ground loop (electricity)
In an electrical system, a ground loop or earth loop occurs when two points of a circuit are intended to have the same ground reference potential but instead have a different potential between them.
See Cassegrain antenna and Ground loop (electricity)
Ground station
A ground station, Earth station, or Earth terminal is a terrestrial radio station designed for extraplanetary telecommunication with spacecraft (constituting part of the ground segment of the spacecraft system), or reception of radio waves from astronomical radio sources.
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Hyperboloid
In geometry, a hyperboloid of revolution, sometimes called a circular hyperboloid, is the surface generated by rotating a hyperbola around one of its principal axes.
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Laurent Cassegrain
Laurent Cassegrain (– 1 September 1693) was a Catholic priest who is notable as the probable inventor of the Cassegrain reflector, a folded two-mirror reflecting telescope design.
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NASA
The National Aeronautics and Space Administration (NASA) is an independent agency of the U.S. federal government responsible for the civil space program, aeronautics research, and space research.
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NASA Deep Space Network
The NASA Deep Space Network (DSN) is a worldwide network of spacecraft communication ground segment facilities, located in the United States (California), Spain (Madrid), and Australia (Canberra), that supports NASA's interplanetary spacecraft missions.
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Nasmyth telescope
The Nasmyth telescope, also called Nasmyth–Cassegrain or Cassegrain–Nasmyth, is a reflecting telescope developed by the Scottish inventor James Nasmyth.
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Noise temperature
In electronics, noise temperature is one way of expressing the level of available noise power introduced by a component or source.
See Cassegrain antenna and Noise temperature
Parabolic antenna
A parabolic antenna is an antenna that uses a parabolic reflector, a curved surface with the cross-sectional shape of a parabola, to direct the radio waves. Cassegrain antenna and parabolic antenna are antennas (radio) and radio frequency antenna types.
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Parabolic reflector
A parabolic (or paraboloid or paraboloidal) reflector (or dish or mirror) is a reflective surface used to collect or project energy such as light, sound, or radio waves.
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Paraboloid
In geometry, a paraboloid is a quadric surface that has exactly one axis of symmetry and no center of symmetry.
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Radar
Radar is a system that uses radio waves to determine the distance (ranging), direction (azimuth and elevation angles), and radial velocity of objects relative to the site.
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Radio telescope
A radio telescope is a specialized antenna and radio receiver used to detect radio waves from astronomical radio sources in the sky.
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Reflecting telescope
A reflecting telescope (also called a reflector) is a telescope that uses a single or a combination of curved mirrors that reflect light and form an image.
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RF front end
In a radio receiver circuit, the RF front end, short for radio frequency front end, is a generic term for all the circuitry between a receiver's antenna input up to and including the mixer stage.
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Sidelobes
In antenna engineering, sidelobes are the lobes (local maxima) of the far field radiation pattern of an antenna or other radiation source, that are not the main lobe.
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Telecommunications
Telecommunication, often used in its plural form or abbreviated as telecom, is the transmission of information with an immediacy comparable to face-to-face communication.
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Voyager program
The Voyager program is an American scientific program that employs two interstellar probes, Voyager 1 and Voyager 2.
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