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5579015 |
Electronic sweep device with active lens and integrated light source
The invention pertains to an electronic sweep device with integrated active lens and light source. The device includes a bundling of superimposed channels C which are separated by thin metal planes...
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5568158 |
Electronic variable polarization antenna feed apparatus
Electronically adaptable polarization antenna feed apparatus for receiving any sense of linear polarization or for receiving either sense of circular polarization. The circuit makes use of variable...
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5550553 |
Dielectric rod antenna
A dielectric rod antenna including a dielectric rod, a ring-shaped conductive film provided on an outer peripheral surface of the dielectric rod, and a waveguide. The conductive film is provided on...
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5543809 |
Reflectarray antenna for communication satellite frequency re-use applications
A dual-polarized antenna includes a planar line or surface array of reradiating elements of two different polarizations. Each reradiating element in one embodiment is a short-circuited vertical or...
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5517203 |
Dielectric resonator filter with coupling ring and antenna system formed therefrom
A plurality of dual mode, dielectric resonator loaded cavity filters may be coupled to respective ones of a plurality of radiators of an array antenna, such as a phased array antenna. Each of the...
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5502453 |
Planar antenna having polarizer for converting linear polarized waves into circular polarized waves
A planar antenna in multilayered arrangement of a grounding conductor plate, a power supplying circuit plate and a radiating circuit plate being separated from one another. Radiating elements of...
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5473334 |
Polarized antenna having longitudinal shunt slotted and rotational series slotted feed plates
An antenna for transmitting rf energy. A polarizer for selectively polarizing the rf energy is operatively connected to a longitudinal shunt slotted plate for radiating rf energy therethrough. A...
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5467100 |
Slot-coupled fed dual circular polarization TEM mode slot array antenna
A slot antenna is provided which includes first and second oppositely disposed metallic plates with a dielectric layer disposed therebetween. An array of horizontal and vertical radiating elements...
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5463358 |
Multiple channel microwave rotary polarizer
This invention is a multiple channel microwave polarization rotator with external rotary mechanical energy coupling. It finds application in microwave polarization rotators, resolvers, amplitude...
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5455594 |
Internal thermal isolation layer for array antenna
An array antenna includes a means of thermally isolating the feed network from the space illuminated by the antenna. Filtering layers are incorporated into the structure between the feed and the...
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5453751 |
Wide-band, dual polarized planar antenna
A planar antenna includes a set of first radiating plate and first power supplying plate in which openings of the former and power supplying terminals of the latter are respectively coupled...
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5440279 |
Electromagnetic radiation converter
An electromagnetic radiation converter for receiving and converting microwave signals having a circular or linear polarization. The converter comprises a waveguide for transmitting both circularly...
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5438340 |
Elliptical feedhorn and parabolic reflector with perpendicular major axes
A parabolic-reflector antenna having a primary horn including first, second, and third hollow portions. The first hollow portion has an elliptical aperture on one end thereof and a circular cross...
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5434587 |
Wide-angle polarizers with refractively reduced internal transmission angles
The usable range of incidence angles for electromagnetic wave polarizers using arrays of polarizer elements is increased by introduction of a dielectric medium having a dielectric constant large...
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5374938 |
Waveguide to microstrip conversion means in a satellite broadcasting adaptor
A waveguide to microstrip converter allowing size reduction as well as providing good cross polar discrimination and input VSWR characteristic. The waveguide to microstrip converter includes a...
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5359336 |
Circularly polarized wave generator and circularly polarized wave receiving antenna
A circularly polarized generator for transmitting circularly polarized transmitted electromagnetic waves and a circularly polarized wave reception antenna for receiving the electromagnetic waves is...
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5337058 |
Fast switching polarization diverse radar antenna system
A fast switching, variably polarized lens is placed in front of a radar antenna which radiates an electromagnetic wave having any fixed polarization. The radiated electromagnetic wave is coupled to...
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5319379 |
Parabolic dual reflector antenna with offset feed
A dual polarized mechanical scan antenna capable of rapid beam scanning includes a parabolic reflector having an elliptically shaped solid metal central section with conductive parallel grids...
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5305001 |
Horn radiator assembly with stepped septum polarizer
A circularly polarized wave entering the horn is converted to a linearly polarized wave which appears in one of the ports depending on the sense of the polarization. The stepped configuration of...
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5276456 |
Antenna feed with selectable relative polarization
An antenna feed having a common circular waveguide with a longitudinally extending rectangular slot in a wall thereof and defining a receive port. An iris is rotatably connected adjacent the...
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5266911 |
Multiplexing system for plural channels of electromagnetic signals
A multiplexing system combines a plurality of electromagnetic signals to propagate along a common path, preferably a square waveguide which can be connected to an antenna feed horn of square cross...
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5260712 |
Printed-circuit antennas using chiral materials
Printed-circuit antennas comprising chiral materials. Printed-circuit antennas in accordance with this invention comprise chiral materials wherein two electromagnetic modes are allowed. The...
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5260713 |
Microwave signal receiving apparatus
In order to isolate microwaves of a selected polarization from incident microwaves collected by means of a dish reflector (10), a ferrite polarizer (16) is positioned at the focal point of the...
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5258768 |
Dual band frequency reuse antenna
A dual frequency band antenna (10) having frequency reuse capability. The antenna waveguide (12) includes a four port waveguide network which transmits and receives orthogonal, linearly polarized...
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5255003 |
Multiple-frequency microwave feed assembly
A multiple-frequency feed assembly for an antenna system having two coaxial cavities, with a smaller, high-frequency cavity mounted coaxially within a larger, low-frequency cavity. A separate...
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RE34410 |
Antenna system for hybrid communication satellite
A satellite communications system employs separate subsystems for providing broadcast and point-to-point two-way communications using the same assigned frequency band. The broadcast and...
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5175559 |
Combined Radar/ESM antenna system and method
A combined antenna system mounted in a nose randome of an aircraft for both radar and ESM signals. A flat plate waveguide antenna, a twist panel, a selective reflector, and a feed are aligned along...
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5172081 |
Polarizer arrangement
A polarizer arrangement in accordance with the invention includes a circular depolarizer combined in a common component with a linear polarizer. The depolarizer material includes a recess within...
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5172129 |
Antenna with circular polarization for antenna array
An antenna excited by a symmetrical strip line (1) including two peripheral conductors (3, 3') positioned respectively above and below a central conductor (2). It comprises, at the end of the...
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5153601 |
Microwave polarizing lens structure
A microwave polarizing lens structure having two concentric hemispherical arrays of metallic linear scattering elements (dipoles) supported by thin walled dielectric shells. It has the property of...
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5134420 |
Bicone antenna with hemispherical beam
A bicone microwave antenna having an orthomode tee as an input/output terminal, an internal dielectric polarizer, a circular waveguide with eight longitudinal radiating slots, two 30 degree conical...
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5128637 |
Radio signal polarization switching arrangement
A radio signal polarization switching arrangement is responsive to linearly polarized radio signals, such as television signals from a satellite. The switching arrangement which is capable of...
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5122810 |
Feed waveguide with ferrite rod polarizer and stepped dielectric support for matching
An antenna arrangement for receiving television signals from a satellite comprises a parabolic dish which collects the signals and feeds them through a feedhorn, then through a polarization switch...
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5107274 |
Collocated non-interfering dual frequency microwave feed assembly
A dual frequency feed assembly for an antenna system having two coaxial cavities, with a smaller, high-frequency cavity mounted coaxially within a larger, low-frequency cavity. A separately...
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5086303 |
Primary feed with central conductor defining a discharge path
A primary radiator is provided which can be used in an attenna to be mounted in an artificial satellite. In particular, the primary radiator is designed to prevent an electrical charge caused by...
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5086301 |
Polarization converter application for accessing linearly polarized satellites with single- or dual-circularly polarized earth station antennas
A single- or dual-circularly polarized earth station antenna is converted into a single- or dual-linearly polarized earth station antenna for accessing linearly polarized satellites. In a first...
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5066958 |
Dual frequency coaxial feed assembly
A dual frequency feed assembly employing a pair of coaxial circular wave guide cavities, each with respective probe. The higher frequency cavity, e.g. Ku band, is located within the lower...
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5055805 |
High speed polarization switch array for selecting a particular orthogonal polarization
An apparatus is disclosed comprising a polarization mode selection switch for preselected wavelengths using a waveguide having a first array of PIN type diodes mounted in a plane extending...
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5053785 |
Polarization selective surface for circular polarization
A surface for an antenna for use in discriminating between horizontal and vertical polarization components of a circularly polorized electromagnetic wave comprises at least one pair of dipoles, one...
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5043683 |
Waveguide to microstripline polarization converter having a coupling patch
A capacitively coupled printed patch (3) as a high efficiency device to couple orthogonally polarized energy between a microstripline (5) and a waveguide (1). Coupling between the microstripline...
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5038152 |
Broad band omnidirectional monocone antenna
A broad band omnidirectional monocone antenna 10 having a wide operative frequency spectrum and a large elevation angle A is disclosed herein. The antenna 10 of the present invention includes an...
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5036332 |
Multi-mode feed system for a monopulse antenna
A monopulse antenna feed system utilizing multiple modes within the feed. A TEM mode and two TE° 11 modes that are orthogonal and in phase quadrature are utilized in the antenna feed system to...
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5005023 |
Dual band integrated LNB feedhorn system
A dual band integrated feedhorn includes a housing having a rotatable support for a C band coaxial waveguide, a clamp for a Ku band waveguide, a Ku band waveguide slideably mounted in the clamp for...
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5003321 |
Dual frequency feed
A dual frequency feed for use with an antenna permits reception of signals in both a low frequency band and a high frequency band and is comprised of a single feed through which both signals are...
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4994819 |
Pattern diversity in a microwave digital radio system utilizing a single horn reflector antenna
During multipath fading in a terrestrial digital radio system, off-axis arrival of signals excites higher-order modes in a horn reflector antenna. In the disclosed system specified ones of these...
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4972199 |
Low cross-polarization radiator of circularly polarized radiation
An antenna is constructed of an array of contiguous circular cylindrical radiators each of which extends forwardly of a radiator assembly producing two circularly polarized waves of opposite...
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4965868 |
Electromagnetic polarization selector
A polarization selector system, suitable for use with an antenna for radiating electromagnetic waves at a variety of preselectable polarizations, is formed of an orthogonal mode launcher of...
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4951010 |
Polarization rotating apparatus for microwave signals
Apparatus is disclosed for rotating the polarization of microwave signal received into a circular waveguide. This apparatus includes a septum mounted within a waveguide, with that septum including...
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4948922 |
Electromagnetic shielding and absorptive materials
A material having a matrix and a plurality of inclusions which are chiral is effective as a coating to reduce incident reflections and absorptions of microwave frequency electromagnetic energy. The...
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4947182 |
Method of feeding electromagnetic power from an antenna element
A method of feeding out field power from a circularly polarized antenna (2), mounted on a conductive aircraft surface (1). All power is normally fed out in circular polarization to the receiver,...
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