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4707702 |
Circularly polarizing antenna feed
A circularly polarizing antenna feed comprises a feed waveguide having a short circuit reflecting plate at one end and a radiating horn at the other, a wave exciter for launching linearly polarized...
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4704611 |
Electronic tracking system for microwave antennas
A directive antenna (for a groundstation or a satellite) has a plurality of discrete receptional states which provide predetermined electronic displacements from boresight of the optimum direction...
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4700195 |
Waveguide fed composite horn antenna
A waveguide-fed horn structure includes a constraining mechanism having an extremely high degree of dimensional stability over a wide thermal range. The constraining mechanism comprises a composite...
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4698640 |
Adjustable platform mounteed horn antenna
A horn antenna is supported by a pair of axially spaced apart trunion assemblies which are rigidly attached to the upper one of a pair of nested ring shaped members, the lower ring member being...
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4695844 |
Device for receiving dual polarized microwave signals
A device for receiving dual polarized microwave signals, including a first waveguide connected to a receiving antenna and to a first substrate bearing a first sensor perpendicular to the...
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4689633 |
Flared microwave feed horns and waveguide transitions
An overmoded waveguide transition comprises a flared waveguide section having different transverse cross-sections at opposite ends thereof, the longitudinal shape of a section of the transition...
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4689630 |
Multi-shaped-beam reflector antenna
A reflector antenna is disclosed which generates two or more beams which are separated angularly in the elevation plane, as in multi-beam antennas, and are shaped so as to provide, when combined,...
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RE32485 |
Wide-beam horn feed for parabolic antennas
Current-flow is suppressed on the outer surface of the horn except in a small endmost region. A reflector surrounds the horn, spaced rearwardly from the mouth. A choke used for the suppression...
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4686537 |
Primary radiator for circularly polarized wave
A primary radiator for circularly polarized wave in accordance with the present invention is equipped with conductor projections along the inner wall of the horn antenna in order to convert...
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4675689 |
Grooved horn radiator with mode coupler
A horn radiator with a grooved inner surface has a mode coupler for a TE 01 wave and includes four cavity resonators embedded in the grooved surface of the horn and interconnected by an annular...
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4673946 |
Ridged waveguide to rectangular waveguide adaptor useful for feeding phased array antenna
A compact adaptor is provided for making transition from ridged waveguide to rectangular waveguide while simultaneously imparting spatial reorientation of associated electric and magnetic fields....
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4673905 |
Corrugated elliptical waveguide or horn
A corrugated elliptical waveguide medium comprises a corrugated hybrid mode excitation member having an elliptical transverse cross-section for propagating electromagnetic energy therethrough. The...
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4672384 |
Circularly polarized radio frequency antenna
A radio frequency antenna is provided comprising: a waveguide section; first means for establishing radio frequency energy in such waveguide section having a first linear polarization with an...
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4667205 |
Wideband microwave antenna with two coupled sectoral horns and power dividers
A wide-band microwave antenna capable of radiating over a wide angular field is fed by a rectangular wave guide and includes a first sectoral horn coupled to the rectangular wave guide. The first...
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4663634 |
Polarization converter within waveguide feed for dish reflector
A microwave polarization converter for converting circular polarization to linear polarization or vice versa. The converter includes a fin and a shorting plate to effect such conversion.
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4660050 |
Doppler radar velocity measurement horn
Doppler radar apparatus for use in a velocity measuring system for farm tractors and the like. The apparatus includes a dual mode conical horn having a flare angle substantially in excess of...
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4658267 |
Ridged waveguide antenna with plural feed inputs
A radio frequency antenna element is provided comprising a waveguide having disposed within and adjacent to a rearward portion of such waveguide a ridge, such ridge having a relatively narrow...
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4658258 |
Taperd horn antenna with annular choke channel
A low cost tapered horn with desirable equal E and H plane pattern beamwidths is achieved with one or more annular channels in the tapered wave translation surfaces of the horn. These channels...
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4644362 |
Waveguide antenna output for a high-frequency planar antenna array of radiating or receiving elements
Antenna output for a planar antenna comprising an array of receiving elements provided by two networks (20, 30) of high frequency transmission lines and three sheets (10, 40, 50). The first sheet...
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4633264 |
Horn antenna
A horn antenna comprises a horn of the type including a rectangular throat, a rectangular opening located in a plane parallel to and spaced part from the throat and having at least one dimension...
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4630059 |
Four-port network coupling arrangement for microwave antennas employing monopulse tracking
A four-port network which is connected to a microwave antenna feed horn for separating four signal paths associated, in pairs, with two polarizations and two frequency bands, and with the network...
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4630062 |
Horn antenna with wide flare angle
A horn antenna suitable for an amplitude-comparison broadband direction-finding system with 360° azimuth coverage comprises a horn with a wide angle of flare in a plane normal to the z-axis of a...
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4626865 |
Antenna element for orthogonally-polarized high frequency signals
A radiating or receiving element for orthogonally polarized high-frequency signals comprises, on both sides of a first layer having a first cavity, first and second perpendicular high-frequency...
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4622559 |
Paraboloid reflector antenna feed having a flange with tapered corrugations
The antenna feed includes a waveguide radiator with a conductive flange positioned about the waveguide near its radiating end. The flange includes one or more corrugations which each have tapered...
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4614947 |
Planar high-frequency antenna having a network of fully suspended-substrate microstrip transmission lines
A planar high-frequency antenna having radiating elements for high-frequency signals includes at least two facing conductive plates provided with oppositely-arranged openings which cooperate to...
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4613989 |
Police radar warning receiver
A compact police radar warning receiver is provided having an antenna in which all of the mixer and oscillator components are mounted to one side of the antenna enabling the exterior wall of the...
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4607260 |
Asymmetrically configured horn antenna
The present invention relates to a horn antenna which provides minimized cross-polarization in the far field of the antenna. The antenna arrangement comprises a horn including four walls wherein a...
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4595890 |
Dual polarization transition and/or switch
A circular waveguide dual antenna feed for TVRO reception, which transfers horizontally and vertically polarized received signals in the circular waveguide simultaneously into two coaxial lines...
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4584588 |
Antenna with feed horn and polarization feed
A polarization feed is provided for use in a directional antenna under separation of two linearly polarized electromagnetic waves whereby the feed is basically comprised of a tube, one end of which...
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4578681 |
Method and apparatus for optimizing feedhorn performance
An optimized feedhorn comprising a circular waveguide having a corrugated plate disposed around the outside of the aperture of the waveguide wherein the corrugations of the plate are capacitive as...
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4574289 |
Rotary scan antenna
An antenna having a rotatable phase center is disclosed. The antenna includes a horn antenna having a phase center and at least one rod-like impedance element located adjacent a wall of the horn...
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4573054 |
Excitation device for a dual band ultra-high frequency corrugated source of revolution
A device for exciting a corrugated ultra-high frequency source of revolution operating in two remote frequency bands, decoupled mechanically from the source. The device includes two excitation...
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4571593 |
Horn antenna and mixer construction for microwave radar detectors
A horn antenna construction, particularly for use in microwave radar detector circuits, comprises a molded horn element that is open at its bottom side, with a ridge molded into its flared top...
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4568943 |
Antenna feed with mode conversion and polarization conversion means
The configuration of a waveguide antenna feed is determined by a shaped body of solid dielectric material which is coated with a conductive material. The conductive material functions as a...
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4554552 |
Antenna feed system with closely coupled amplifier
A compact antenna feed system for orthogonally polarized RF signals includes a waveguide feed having orthogonally disposed internal ridges, a pair of wave detectors coupled to the waveguide feed to...
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4553113 |
Compact differential coupler for monopulse radar
A compact differential coupler for a monopulse tracking radar constituted by four magic T's and comprising two metal members, which are symmetrical with respect to a plane π and machined in such a...
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4544900 |
Polarized signal receiver system
A rotatable polarized signal receiver, having a rectangular waveguide orthogonally coupled to a circular waveguide, has a receiver probe portion oriented in the circular waveguide and a signal...
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4538175 |
Receive only earth satellite ground station
A receive only, low cost, small size, frequency agile earth satellite ground station has the low noise amplifier, frequency agile receiver, head end modulator, motor control circuit and optional...
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4533919 |
Corrugated antenna feed arrangement
The present invention relates to an antenna feed arrangement capable of providing a zero reflection response at a first frequency of interest and a maximally flat response at a widely separated...
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4531131 |
Ridged waveguide antenna with concave-shaped sidewalls
A radio frequency antenna comprising a rectangular waveguide having opposing relatively concave-shaped narrow side wall portions extending from a rear wall of the waveguide structure to an aperture...
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4529989 |
Microwave radiation source comprising open cavities energized by two dipoles
Microwave radiation source operating in two different frequency bands comprising two open cavities energized by two orthogonal dipoles, situated one within the other, the two cavities being wholly...
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4528528 |
Waveguide polarization coupling
A rotatable coupling probe is disposed within a waveguide housing to provide accurate rotation of the plane of polarization between a rectangular input waveguide element and a circular output...
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4527165 |
Miniature horn antenna array for circular polarization
An antenna for circularly polarized high-frequency signals comprising a succession of layers. An insulating layer 10 includes openings defined by metal plated walls forming miniature horns, each...
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4521783 |
Offset microwave feed horn for producing focused beam having reduced sidelobe radiation
A short-focus microwave reflector is located a short distance away from the feed horn and is positioned to reflect the beam of microwave radiation away from the feed axis and toward a large primary...
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4511899 |
Horn-reflector microwave antenna with internal debris trap
A horn-reflector microwave antenna comprises the combination of a paraboloidal reflector for transmitting and receiving microwave signals; a tapered feed horn extending downwardly from the...
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4507665 |
Primary source with frequency re-utilization
A primary source for a space communications antenna requiring a mode extractor means comprises more especially a horn with two types of evenly spaced alternate corrugations whose depth decreases,...
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4504836 |
Antenna feeding with selectively controlled polarization
A flat face annular grooved metal surface surrounds a circular waveguide opening coupled to a small dipole radiator which excites the circular waveguide in its fundamental propagating mode (TE 11...
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4482898 |
Antenna feed arrangement for correcting for astigmatism
The present invention relates to an antenna feed arrangement for correcting for astigmatism caused by an offset main reflector. The feed arrangement comprises at least one feed element, a first and...
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4482899 |
Wide bandwidth hybrid mode feeds
The present invention relates to hybrid mode feeds which are capable of handling very wide bandwidths. In the present feed arrangements, a dominant TE 11 mode is converted to the HE 11 hybrid...
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4477816 |
Corrugated antenna feed horn with means for radiation pattern control
A horn feed for use with a reflector for generating a narrow beam of radiated energy in a radar system. The horn includes surface corrugations and provides a unique configuration of horn flare...
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