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4476470 |
Three horn E-plane monopulse feed
A three-horn microwave feed produces a near ideal aperture width ratio of 2:1 for the difference and sum modes of aperture illumination. Three horns are utilized, each of which supports propagation...
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4473828 |
Microwave transmission device with multimode diversity combined reception
A microwave transmission system for multipath propagation operating according to the angle diversity principle and comprising a transmitting and receiving device including a reflector antenna and a...
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4472721 |
Broadband corrugated horn radiator
A broadband corrugated horn radiator including a hybrid mode exciting member whose inner cross section is constant over its entrie length and a transition member from the cross section of the...
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4447811 |
Dielectric loaded horn antennas having improved radiation characteristics
An H-plane sectoral horn antenna is loaded with low-loss dielectric inserts n alternative embodiments so as to reduce beamwidth, increase axial gain and to achieve non-mechanical beam scanning. In...
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4443804 |
Modified difference mode coaxial antenna with flared aperture
A coaxial radiating waveguide antenna is disclosed, comprising two conductive concentric right circular cylinders forming a cavity. Equally spaced within the cavity is a set of probes phased in...
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4442437 |
Small dual frequency band, dual-mode feedhorn
The present invention relates to a dual frequency band, dual-mode feedhorn comprising three serially connected waveguide sections (20, 22, 24) and a separate discontinuity (21, 23) at each joint...
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4439748 |
Corrugated waveguide or feedhorn assembled from grooved pieces
The present invention relates to a rectangular corrugated waveguide or feedhorn wherein a plurality of adjacent grooves of a predetermined depth and cross-section are formed, preferably by...
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4423422 |
Diagonal-conical horn-reflector antenna
A horn-reflector microwave antenna has a reflector plate which is a section of a paraboloid, and a flared feed horn for supplying microwave signals to the reflector plate. The horn has a conical...
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4420756 |
Multi-mode tracking antenna feed system
a tri-mode coupler (80) for developing from a received signal including three waveguide propagation modes the three tracking signals (i.e. sum signal, elevation signal, and azimuth signal) used in...
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4419671 |
Small dual frequency band hybrid mode feed
The present invention relates to a small hybrid mode feed for dual frequency band use. In the present feed, a helically wound wire structure (10) is bonded to the inner surface of a hollow...
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4419670 |
Dual feed box horn antenna
A radar antenna includes a box horn radiator which is capable of simultaneously transmitting X band and S band signals. The S band signals are transmitted as a resultant of the TE 01 and TE 03 ...
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4412222 |
Dual polarized feed with feed horn
The present invention relates to a dual polarized feed by which two linea polarized waves can be reliably separated. The two waves are conducted separately over high frequency coaxial cables, one...
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4410892 |
Reflector-type microwave antennas with absorber lined conical feed
A feed horn for a reflector-type microwave antenna comprises a smooth-walled conical horn and a lining of absorber material on the inside wall of the horn for reducing the width of the RPE...
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4408208 |
Dip brazed corrugated feed horn
A corrugated feed horn and its method of manufacture is disclosed for circularly polarized SHF (super high frequency) and EHF (extra high frequency) parabolic antennas operating in the 12-100 GHz...
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4398200 |
Feed apertures with crosspolarization compensation for linear polarization
The crosspolarization components radiated by adjacent orthogonally linearly polarized feed horns of a reflector antenna system are compensated by structural modifications incorporated in the feed...
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4388625 |
Multimode diagonal feed horn
In the past, conventional diagonal horns have been used for providing high gain and equalization of the beam widths in the E and H planes. However, a problem has existed in such horns in that...
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4387378 |
Antenna having electrically positionable phase center
An antenna (50) is disclosed herein whose phase center may be electrically moved relative to a main receiving/radiating element. The main receiving element (56) is located in a cavity (54) in a...
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4387377 |
Apparatus for converting the polarization of electromagnetic waves
Apparatus for converting the polarization of electromagnetic waves from linear polarization to circular polarization wherein a plurality of layers of meandering electrical conductors are formed...
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4380014 |
Feed horn for reflector antennae
An improved feed horn for use with long f/D reflector antennae comprising an aperture having a plurality of protuberances orthogonally disposed around the periphery thereof, a conical section, a...
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4370659 |
Antenna
A broad band millimeter wave finline antenna includes a finline transmission means having a flared end portion formed by tapering the adjacent edges of the finline elements and affixing planar...
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4365253 |
Antenna feeder system for a tracking antenna
In a feeder system associated with an antenna for transmitting circularly polarized signals and for receiving a circularly polarized beacon signal, which system includes an exciter having an...
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4358770 |
Multiple frequency antenna feed system
An multi-frequency antenna feed system has a corrugated conical horn and a diplexer interconnected serially to be operative in two frequency bands represented by frequencies f H and f L ...
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4357612 |
Multimode ultrahigh-frequency source and antenna
A multimode ultrahigh-frequency source with wide passband comprises a rectangular waveguide with a cavity terminating at an exit aperture in a horizontally flared horn, an input end of the cavity...
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4356495 |
Corrugated antenna feedhorn with elliptical aperture
An antenna feedhorn comprising a transition waveguide for matching the cross section of the feeder line to the cross section of a subsequent hybrid mode exciting section followed by a horn section...
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4353072 |
Circularly polarized radio frequency antenna
A radio frequency antenna including an antenna element having an open-ended waveguide section coupled to a first feed means for establishing radio frequency energy having linear polarization, the...
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4353074 |
Radio frequency ridged waveguide antenna
A radio frequency antenna comprising a waveguide having opposing relatively wide, upper and lower wall portions, a pair of opposing, relatively narrow side wall portions, and a relatively narrow...
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4349827 |
Parabolic antenna with horn feed array
A radio frequency antenna having a parabolic reflecting surface and an array of feeds disposed adjacent the focal point of the parabolic reflecting surface, such feeds providing a predetermined...
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4338609 |
Short horn radiator assembly
Substantial weight reduction and size reduction in phased array radiators are obtained by coupling a dielectrically loaded waveguide directly to a short horn radiator whose electrical length is...
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4320404 |
Microwave phase shifter and its application to electronic scanning
A plurality of metallic wire conductors are fitted in shunt along a shorted wave guide parallel to a dielectric field of electromagnetic wave incident to the wave guide. At least some of the wires...
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4313122 |
Open cavity radiating source excited by a dipole
A microwave radiator comprises a generally cup-shaped, at least partly metallic cavity with a cylindrical wall and an open end which is bounded by an edge or rim with two diametrically opposite...
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4309709 |
Dual frequency aerial feed arrangements
The invention provides a dual frequency aerial feed arrangement consisting of a main feed horn having on either side of its mouth ground plane members above which are mounted dipole radiators. The...
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4308541 |
Antenna feed system for receiving circular polarization and transmitting linear polarization
An object is to provide for receiving a circularly polarized signal from an antenna feed (10) connected to orthogonally spaced antenna elements (11, 12, 13, 14) and for transmitting a linearly...
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4301456 |
Electromagnetic wave attenuating surface
Surface structures attached to a support member for reducing coupling between two antennas carried by the support member or for reducing the side lobes of a horn antenna, the structures consisting...
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4297710 |
Parallel-plane antenna with rotation of polarization
A parallel-plane antenna of the pillbox or cheese type in which the cylindrical-parabolic portion is constituted by a semitransparent reflector and the focal plane of which is constituted by a...
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4295142 |
Corrugated horn radiator
A corrugated horn radiator which includes a transition zone made up of a number of parts between the smooth-wall feed wave guide 1 having a cross-section which is constant and a horn radiator with...
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4268832 |
Multipath discriminating antenna system
To reduce guidance errors in a microwave landing system from false signals eflected by objects along runways, the transmitting antenna radiates an elliptically polarized beam. At the airborne...
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4266203 |
Microwave polarization transformer
A microwave polarization transformer comprises a number of dielectric plates each having embedded therein one or two networks of parallel conductive wires in which switchable diodes are inserted....
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4263599 |
Parabolic reflector antenna for telecommunication system
A parabolic reflector antenna, designed to discriminate between incoming and outgoing waves having mutually orthogonal planes of polarization, has a ratio R between focal distance f and diameter D...
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4258366 |
Multifrequency broadband polarized horn antenna
A multifrequency, broadband, dual-polarized corrugated conical horn antenna is simultaneously fed a multiplicity of signals, two for each of five frequencies, with each of a pair of signals fed in...
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4255753 |
Antenna construction for reducing side lobes of the radiation pattern
A construction for reducing the side lobe energy emitted from antennas, particularly horn antennas, and thereby attenuating unwanted coupling with adjacent antennas, the construction utilizes a...
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4249183 |
Periscope arrangement with protection against parasitic radiation
A cylindrical metal sheath surrounds the beam rays between the antenna and the passive reflector of a periscope arrangement; this sheath forms the support of the periscope arrangement as well as a...
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4246584 |
Hybrid mode waveguide or feedhorn antenna
The present invention relates to a hybrid mode waveguide or feedhorn antenna for transforming the TE 11 mode into the HE 11 mode. The waveguide or antenna comprises a first waveguide section of...
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4241353 |
Multimode monopulse feed and antenna incorporating same
A mixed E-plane and H-plane multimode monopulse feed is formed by a multimode E-plane horn structure, in the aperture of which metal bars or plates are arranged parallel to the electrical field....
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4231043 |
Technique for reducing near-in sidelobes of an offset antenna
The present invention relates to technique for reducing near-in sidelobes of an offset antenna. The method comprises positioning at least one piece of microwave absorbing material on a sector of...
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4231042 |
Hybrid mode waveguide and feedhorn antennas
The present invention relates to a hybrid mode waveguide or feedhorn antenna for transforming the TE 11 mode into the HE 11 mode. The waveguide or feedhorn comprises a circular waveguide...
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4223316 |
Antenna structure with relatively offset reflectors for electromagnetic detection and space telecommunication equipment
An antenna structure includes an at least partly parabolic main reflector and an auxiliary reflector of generally similar configuration, the two reflectors having confronting concave surfaces and...
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4222017 |
Rotatable polarization duplexer
The cavity of a rotatable cylindrical waveguide supports the TE 11 mode of propagation of a received wave and a transmitted wave. The proximal and distal ends of the cylindrical waveguide are...
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4217549 |
Device for two-way information link
This invention relates to a device for a two-way information link, where a first one of two units or both units are intended to transmit an interrogation signal to the second unit, and the second...
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4214248 |
Transreflector scanning antenna
A 360 degree fan beam scanning antenna which includes a transreflector created by a plurality of reflecting elements arranged on a surface of revolution formed about a generating axis and a feed...
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4210915 |
Microwave antenna with exponentially expanding horn structure
A microwave antenna having an exponentially expanding horn of circular outlet cross-section. The inlet opening to the horn has a rectangular cross-section. In a transition region from the inlet...
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