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4250508 |
Scanning beam antenna arrangement
The present invention relates to an antenna arrangement capable of generating one or more linearly scanning spot beams which are scanned over separate strip portions of the entire field of view of...
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4245223 |
Self-multiplexing antenna employing orthogonal beams
A self-multiplexing antenna comprising an array of radiating elements for diating a plurality of orthogonal beams in response to wave energy excitations applied thereto. A plurality of first...
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4232321 |
Multiple beam satellite antenna with preferred polarization distribution
Microwave energy feed elements for launching essentially linearly polarized beams in a satellite communications system are oriented in the satellite's antenna so that the polarization directions of...
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4220957 |
Dual frequency horn antenna system
A feature of this invention is the provision of an antenna system providing two, coaxial, copolarized, independently focused beams: a relatively wide, low frequency, searching beam, and a...
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4207573 |
Dual-frequency antenna system with common reflector illuminated by different feeds
A dished reflector is illuminated by a primary radiation feed including a rectangular waveguide and a secondary radiation feed comprising two dipoles flanking that waveguide. In order to minimize...
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4203105 |
Scanable antenna arrangements capable of producing a large image of a small array with minimal aberrations
The present invention relates to antennas which have reflector arrangements that produce a large image with minimal aberrations at the exit aperture thereof of a small feed array. In the present...
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4187508 |
Reflector antenna with plural feeds at focal zone
An antenna assembly with a curved reflector and feed means at one side of the focal axis of such reflector. The feed means includes a number of relatively-fixed-position feed elements spaced apart...
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4185287 |
Mechanically scanned antenna system
A mechanically scanned antenna system having a multiport rotary switch for sector scanning is disclosed. The switch includes a stationary subassembly and a rotating subassembly. The stationary...
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4156243 |
Paraboloid reflector antenna
Eight radiators are disposed along a line in a vertical plane that intersects the focal point of a paraboloid reflector. When excitation is applied to a radiator, electromagnetic energy is...
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4145695 |
Launcher reflectors for correcting for astigmatism in off-axis fed reflector antennas
The present invention relates to novel launcher reflectors which are used with reflector antenna systems to compensate for the dominant aberration of astigmatism which was found to be introduced in...
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4115782 |
Microwave antenna system
An antenna for use in propagating or receiving microwave radiation having both left-hand and right-hand circular polarization. The left-hand and right-hand circularly polarized radiation may be...
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4107690 |
Antenna arrangement for radar or direction finding purposes respectively, with sum and difference patterns
The antenna arrangement for radar or direction finding purposes, respectively, has sum and difference patterns for mono-pulse operation comprising a reflector and at least two linearly polarized...
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4051476 |
Parabolic horn antenna with microstrip feed
An antenna element is disclosed having a printed circuit parallel plate region with a parabolically shaped reflecting wall and a flared radiating section. The flared radiating section is disposed...
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4014027 |
Omnidirectional antenna for around a mast
Omnidirectional antenna provided with a rotation-symmetrical reflector and a concentric radiator, to be mounted around a mast, which radiator has an uninterrupted annular exit edge. All the...
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3988736 |
Steerable feed for toroidal antennas
A plurality of steerable beam feed devices are used in combination with a single stationary toroidal antenna which permits simultaneous communication with several geosynchronous satellites. Each...
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3965475 |
Switchable beamwidth monopulse method and system
In a switchable beamwidth monopulse method and system, an antenna comprising a curved reflector and a first set of monopulse feeds positioned in the effective region of the Airy disc of the antenna...
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3953858 |
Multiple beam microwave apparatus
A compact offset Cassegrainian antenna having a paraboloidal main reflector and a convex subreflector brings microwave beams to a focus. A small flat reflector placed in one of the beams at the...
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3936835 |
Directive disk feed system
A multiple beam antenna having either a main reflector or a lens is illuminated by a feed system comprising a number of primary radiators such as dipole elements. Primary radiation from each dipole...
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3927408 |
Single frequency, two feed dish antenna having switchable beamwidth
A switchable beamwidth antenna includes a concave parabolic main reflecting dish which has a central circular region and a surrounding coaxial annular region. A feed means selectively excites only...
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3922682 |
Aberration correcting subreflectors for toroidal reflector antennas
The correction of aberration in toroidal reflector antennas by a novel type of subreflector is disclosed. The specific shape of the subreflector ultimately depends on the geometry of the toroidal...
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3916416 |
360° Azimuth scanning antenna without rotating RF joints
A 360° scanning radar antenna has a plurality of primary focusing-uctures arranged in a circular fashion illuminating corresponding secondary focusing-structures which in turn are arranged about,...
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3916414 |
Antenna system for primary and secondary radar
A common antenna system for a primary and a secondary radar transceiver is described. The primary feeder connected to the primary transceiver is provided with two probes for transmitting and...
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3914768 |
Multiple-beam Cassegrainian antenna
A multiple-beam Cassegrainian antenna configuration is disclosed which supports a plurality of angularly displaced but well-isolated beams and exhibits essentially zero aperture blockage. A...
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3881178 |
ANTENNA SYSTEM FOR RADIATING MULTIPLE PLANAR BEAMS
Disclosed are antenna systems for simultaneously radiating a plurality of planar beams into a region of space. One such system includes a cylindrical reflector with a plurality of feed elements...
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3878523 |
Generation of scanning radio beams
A radio aerial is disclosed by which planar beams can be swept through wide angles in space without the need for moving aerials, and which may be used in radio location systems using scanning beams...
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3877032 |
Reflector antenna with improved scanning
A Cassegrainian antenna system has a planar array as the feed. An intermediate reflector is positioned in the near field of the array for substantially collimated illumination with all array...
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3852762 |
SCANNING LENS ANTENNA
An improved microwave antenna for use in aircraft guidance in which respective azimuth and elevation antenna are fed through dielectric lenses by respective rotating scanners to result in scanned...
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3842421 |
MULTIPLE BAND FREQUENCY SELECTIVE REFLECTORS
Polarization independent resonant elements are arrayed in a common plane to form a frequency selective reflective surface for electromagnetic energy. By employing an interspersed array of multiple...
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3818490 |
DUAL FREQUENCY ARRAY
An antenna array having two repetitive radiator systems in a single aperture, operating in two distinct frequency ranges. Each radiator system includes an open-ended, circular waveguide and a...
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3815140 |
MULTIPLE FEED FOR MICROWAVE PARABOLIC ANTENNAS
A multiple feed microwave antenna. Individually fed illuminators are placed in a predetermined configuration with respect to each other and to a single parabolic reflector and are fed with...
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3810185 |
DUAL POLARIZED CYLINDRICAL REFLECTOR ANTENNA SYSTEM
A dual polarization antenna system comprising a cylindrical reflector having a parabolic cross section. The cylindrical reflector simultaneously collimates energy directed from a vertically...
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3803619 |
MULTI-HORN WHEEL SCANNER WITH STATIONARY FEED PIPE FOR SCHWARZSCHILD RADAR ANTENNA
A plurality of radial waveguides communicate microwave energy to respective ircumferentially positioned horns. A stationary feed horn is disposed in the center of the waveguides to sequentially...
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3798646 |
CONTINUOUS-WAVE, MULTIPLE BEAM AIRPLANE LANDING SYSTEM
A microwave landing system for airplanes is disclosed in which continuous wave energy from a common source is radiated in overlapping beams which are modulated at respectively different audio...
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3798655 |
SCHWARZCHILD RADAR ANTENNA UTILIZING A RING SWITCH FOR GENERATING A SECTOR SCAN
A Schwarzschild Antenna has main and subreflectors. A ring switch disposed behind the aperture in the main reflector generates a unidirectional sector scan beam that is collimated and transmitted...
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3797020 |
MICROWAVE ANTENNA STRUCTURE WITH APERTURE BLOCKING ELIMINATION
An aplanatic multi-beam antenna free from aperture-blocking effect comprises a convex main reflector and a concave subsidiary reflector whose axes orthogonally intersect at a planar network of...
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3795003 |
SCHWARZSCHILD RADAR ANTENNA WITH A UNIDIRECTIONAL TURNSTILE SCANNER
A Schwarzschild Antenna includes feed horns respectively mounted on a turile waveguide switch. During transmission, as each horn passes a particular arc of rotation, microwave energy is emitted...
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3795004 |
CASSEGRAIN RADAR ANTENNA WITH SELECTABLE ACQUISITION AND TRACK MODES
A Schwarzschild Antenna cooperates with an organ pipe scanner to achieve e angle sectoral scanning of a high gain pencil beam. A rotatable mirror switches the antenna to conical scanning whereby...
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3792474 |
SCHWARZSCHILD RADAR ANTENNA OPERABLE IN SECTOR SCAN AND CONICAL SCAN MODES WITH ANTI-BLOCKAGE REFLECTOR
A Schwarzschild radar antenna has an organ-pipe scanner for producing relvely wide angle unidirectional sector scans of a high-gain pencil beam. When conical scanning is desired, energy from...
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3774223 |
HIGH-FREQUENCY WAVEGUIDE FEED IN COMBINATION WITH A SHORT-BACKFIRE ANTENNA
A high-frequency waveguide feed in combination with a short-backfire antenna having a cavity and multiple reflectors to permit high power handling capabilities and high frequency applications. An...
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3747109 |
WAVEGUIDE ANTENNA STRUCTURE FOR INTRUSION DETECTION APPARATUS
The disclosure includes an intrusion detection unit having a rectangular transmitting waveguide and a corresponding receiving waveguide mounted in stacked relationship within a U-shaped housing...
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3716869 |
MILLIMETER WAVE ANTENNA SYSTEM
A millimeter wave antenna mounted on a satellite includes a parabolic reflector fabricated of carbon fiber reinforced plastic (CFRP) composite material to enable the parabolic shape of the...
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3710341 |
GREGORIAN ANTENNA WITH RING FOCUS
A Gregorian antenna system has the usual main reflector, subreflector, a first feed for illuminating the main reflector from the virtual focus via the subreflector, and a second feed for directly...
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3698001 |
FREQUENCY GROUP SEPARATION FILTER DEVICE USING LAMINATED DIELECTRIC SLAB-SHAPED ELEMENTS
A frequency group separation filer device using slab-shaped dielectric elements, preferably disposed in a beam-forming region defined between an antenna and feeder, the filter being so designed as...
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3696435 |
OFFSET PARABOLIC REFLECTOR ANTENNA
In accordance with the disclosure, two or more main beams of an offset parabolic reflector antenna are directed without producing second order aberrations by placing their respective feeds so that...
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3680143 |
SHAPED BEAM ANTENNA
The apparatus of the present invention provides an antenna adapted to optimize the transmission or reception performance of a satellite subject to the usually encountered weight and volume...
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3665481 |
MULTI-PURPOSE ANTENNA EMPLOYING DISH REFLECTOR WITH PLURAL COAXIAL HORN FEEDS
A microwave antenna useful on a spacecraft, which utilizes a single dish reflector and single coaxial horn structure to transmit at two frequencies, and to receive signals at a third frequency that...
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3623094 |
TARGET ACQUISITION ANTENNA
A target tracking and acquisition system includes a Cassegrain reflector system driven by three horn feed elements. One horn excites a main lobe coincident with the reflector system boresight axis...
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3573836 |
ANTENNA WITH CONICAL TRANSMISSION LINE FEED
The apparatus of the present invention provides an antenna with a dual circularly polarized monopulse feed system which employs a conical or angular transmission line to guide a transverse...
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3569976 |
ANTENNA ARRAY AT FOCAL PLANE OF REFLECTOR WITH COUPLING NETWORK FOR BEAM SWITCHING
An antenna system for steering plural beams from a secondary reflector is formed from a primary array of linear feed elements, which can be arranged in either a one- or two-dimensional...
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3534375 |
MULTI-FEED CONE CASSEGRAIN ANTENNA
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