Abstract: A conductor member contains a linear feed waveguide extending in a fixed direction and a plurality of horn antennas coupled to the feed waveguide and set at an interval of about one half of a wavelength in the extending direction of the feed waveguide. The horn antennas are formed by horns and coupling waveguides, and the coupling waveguides are set so as to partially enter the feed waveguide. When the size of the spatial coupling portion formed by the entrance is changed, the degree of coupling between the feed waveguide and each of the coupling waveguides changes.

Abstract: To produce a primary radiator including a horn part and a waveguide, the cross section of which is elliptical shape, and which can be easily formed, so that production cost is reduced, a primary radiator 3 of the present invention is so arranged that it includes a horn part 3a and a waveguide 3b which are formed in one piece by deep-drawing process.

Abstract: Methods, systems, and apparatus are disclosed for high power thermal vacuum testing of satellite payloads using pick-up horns. Such pick-up horns can include at least one outer metal wall forming a metal body and at least one interior surface disposed in the metal body, forming at least one chamber in the metal body. The pick-up horn further includes a front metal surface disposed at a front end of the metal body, having at least one opening corresponding to the at least one chamber, and at least one high-power absorbing load disposed within the at least one chamber and in contact with the at least one interior surface. A pick-up horn may further include a serpentine coolant path disposed within the metal body between an outer surface of the at least one outer metal wall and the at least one high-power absorbing load. Related systems and methods are described.

Abstract: An antenna assembly is disclosed which can minimize interference of antennas for communication services. The antenna assembly is suitable to minimize side-lobes and back-lobes interfering with each other in antennas used in a repeater for communication services. The antenna assembly includes a reflector having a structure capable of minimizing radiation patterns having front-to-back ratio (FTBR) characteristics, namely, back-lobes.

Abstract: A communication system including an antenna array with feed network coupled to communication electronics. In one example, a communication subsystem comprises a plurality of antennas each adapted to receive an information signal and a plurality of orthomode transducers coupled to corresponding ones of the plurality of antennas, each OMT is adapted to provide at a first component signal having a first polarization and a second component signal having a second polarization. The communication subsystem also comprises a feed network that receives the first component signal and the second component signal from each orthomode transducer and provides a first summed component signal at a first feed port and a second summed component signal at a second feed port, and a phase correction device coupled to the first and second feed ports and adapted to phase match the first summed component signal with the second summed component signal.

Abstract: A collision alerting and avoidance system for use in an aerial vehicle is presented herein. The system comprises a one low profile antenna array disposed on the aerial vehicle. A transmitter/receiver probe is coupled to the antenna array. The transmitter/receiver probe is configured to transmit electromagnetic waves and to receive an echo signal reflected from a threat obstacle. At least one transmitter/receiver module is coupled to the transmitter/receiver probe. The transmitter/receiver module is configured to produce electromagnetic waves for transmission and to receive the echo signal. A processor coupled to the plurality of transmitter/receiver modules controls the transmission of electromagnetic waves from the antenna array and processes the echo signal to provide an output signal containing information regarding the obstacle.

Abstract: An antenna system includes a reflector having a modified-paraboloid shape; and a multi-beam, multi-band feed array located at a focal point of the reflector so that the antenna system forms a multiple congruent beams that are contiguous. The system has a single reflector with non-frequency selective surface. The reflector is sized to produce a required beam size at K-band frequencies and is oversized at EHF-band frequencies. The synthesized reflector surface is moderately shaped and disproportionately broadens EHF-band and Ka-band beams compared to K-band beams. The synthesized reflector surface forms multiple beams each having a 0.5-degree diameter at K-band, Ka-band, and EHF band. The multi-beam, multi-band feed array includes a number of high-efficiency, multi-mode circular horns that operate in focused mode at K-band and defocused mode at Ka-band and EHF-band by employing “frequency-dependent” design for the horns.

Abstract: An artificial dielectric antenna structure for reducing the mass and insertion loss of an antenna is provided. The artificial dielectric antenna structure includes a plurality of layers of dielectric material. Each layer of dielectric material has a dielectric constant. The artificial dielectric antenna structure further includes a plurality of spacing layers interposed between the plurality of layers of dielectric material. Each of the plurality of spacing layers has a dielectric constant lower than the dielectric constant of any of the plurality of layers of dielectric material. The artificial dielectric antenna structure may be disposed within a horn antenna. The artificial dielectric antenna structure may alternately be disposed upon a transmission medium to form a dielectric resonator antenna.

Abstract: An integrated antenna and reflector feed is provided which is structured as a waveguide cavity antenna or array having a curved reflector coupled to a sidewall of the waveguide cavity. A radiation source is situated facing the curved reflector and one or more radiating elements are provided on a top surface of the waveguide cavity. Several curved reflector feeds may be used, operating in the same or different frequencies.

Abstract: An RF feed is provided which is structured as a curved reflector coupled to a sidewall of a waveguide cavity. A radiation source is situated facing the curved reflector. The RF feed may be coupled to a waveguide cavity having radiation elements coupled to top surface thereof, to thereby feed an antenna array. When an antenna array is used, several curved reflector RF feeds may be used, operating in the same or different frequencies.

Abstract: A method for making a feed structure for an antenna may include providing a polarizer body having a polarizer sidewall extending longitudinally between spaced apart ends. A portion of the polarizer sidewall is deformed to provide at least one polarizing structure that extends radially inwardly along an interior of the polarizer sidewall relative to adjacent portions of the polarizer sidewall. The method thus can be utilized to produce an antenna structure.

Abstract: A feed window for a low noise block converter feedhorn incorporated into a microwave-range antenna assembly is formed from a thermoplastic polymer composition containing a hydroscopic-effective amount of a high molecular weight siloxane.

Abstract: An antenna is provided which is structured to operate at two frequency bands simultaneously. The antenna is structured as a waveguide cavity having two types of radiating elements provided on its top surface, symmetrically about the diagonal of the cavity. One group of radiating elements is optimized to operate at one frequency band, while the other group is optimized to operate at a first frequency band. In one implementation, two groups of holes of different diameter are provided on the top surface of the cavity and the radiating elements are two groups of cones of different diameter coupled to different diameter holes. The different diameter holes act as a filet between the two frequency bands.

Abstract: A method of fabricating an antenna includes the step of stamping an initial set of openings within a metal strip and then plating that metal strip on all exterior surfaces. Initial openings define portions of features of the completed antenna that require plating on all surfaces. Once the metal coil has been plated the metal strips are fed through a final stamping process that makes final cuts that correspond with the initially made openings. The final cuts are on surfaces that do not require plating on all of the exterior surfaces.

Abstract: A method for manufacturing a broadband antenna, such as applicable for a low radar cross-section ground penetrating radar. A conductive film is deposited along a dielectric member, such as by sputtering, in such a manner that the impedance of the conducting film is a continuous function of length along the dielectric member. A sampling circuit is then coupled electrically to the feedpoint.

Abstract: A device for receiving satellite signals, associated to a parabolic dish (2) suitable for reflecting to a corresponding focus a first signal (25) at a first frequency and a second signal (35) at a second frequency. The device comprises a first feed (7,8) arranged near the focus suitable for transducing the first signal and transmitting it to a first receiver (9), a second feed (40,40a,40b) arranged hear the focus suitable for transducing the second signal (35,35a,35b) and transmitting it to a second receiver. The first frequency is dedicated to TV channels and the second frequency is at a band different from the first frequency and is dedicated to internet transmissions. The feeds can be of double reflection type, comprising a reflecting plate (7) that directs signals already reflected from the parabolic dish (2) towards a tubular wave guide (8) co-axial to the parabolic dish as well as towards a dipole (40) that constitutes the second feed.

Abstract: A coupled nano-resonating structure includes a plurality of a nano-resonating substructures constructed and adapted to couple energy from a beam of charged particles into said nano-resonating structure and to transmit the coupled energy outside said nano-resonating structure. The nano-resonant substructures may have various shapes and may include parallel rows of structures. The rows may be symmetric or asymmetric, tilted, and/or staggered.

Abstract: A feedhorn includes a chassis body, a waterproof cover serving as a cover member and a dielectric antenna. The chassis body includes a waveguide having an opening. The waterproof cover is connected to the chassis body to close the opening. The waterproof cover is made of a dielectric. The dielectric antenna is placed to face the opening with the waterproof cover therebetween. Thus, the feedhorn, a radio wave receiving converter and an antenna with which the manufacturing cost can be reduced are achieved.

Abstract: A horn antenna part of a radar apparatus is made of a heat emitting material and includes: an antenna body part having a plurality of horn parts arranged in an array form, wherein each horn part is open toward a front surface of the apparatus, and has a diameter which gradually increases toward the front surface; and a feeder part including a waveguide which communicates with the horn parts, wherein the feeder part is connected to the antenna body part. The radar apparatus also includes: a wireless part for generating a high-frequency signal supplied to the feeder part, and converting a reflected high-frequency signal to a medium-frequency signal; and a circuit part for controlling the high-frequency signal and processing the medium-frequency signal. At least one of the wireless part and the circuit part is arranged in a manner such that it contacts the feeder part.

Abstract: A monoconical antenna comprises: a substantially conical concavity formed in one end face of a dielectric; a radiation electrode provided on the surface of the concavity; and a ground conductor provided in proximity to and substantially in parallel with the other end face opposite the one end face of the dielectric. The monoconical antenna is so constituted that electrical signals are fed to between the near vertex region of the radiation electrode and the region of the ground conductor. The half-cone angle ? of the substantially conical concavity formed in the one end face of the dielectric is determined by a predetermined rule corresponding to relative dielectric constant ?r. Thus, the quality of wideband characteristics inherent in the monoconical antenna can be sufficiently maintained, and further size reduction can be accomplished by dielectric loading.

Abstract: More reliable satellite television reception in moisture conditions is provided by recognizing the critical relationship between satellite signal transmissivity and the effects of superhydrophobocity. Instead of trying to use a hydrophobic or superhydrophobic coating or material to shed water from a satellite antenna, superhydrophobic materials and coatings are strategically utilized to minimize the impact of water on the transmissivity of the satellite signal through transmissive surfaces in the antenna system. In a preferred embodiment, an exterior surface of a feed horn cover is coated with a superhydrophobic material to maintain a more consistent satellite signal reception.

Abstract: A reflective Fresnel lens for shaping an incident wave for efficiently delivering the incident wave to an array of receivers, having a wavelength within a predetermined range. The Fresnel lens comprises a ground plate and a plurality of reflective elements formed at various levels of the ground plate. The predetermined range includes millimeter wavelength range, sub-millimeter wavelength range or microwave wavelength range.

Abstract: Antenna arrangements that include two or more antennas in an enclosure are provided. Each of these antennas can be tuned to a separate frequency band and/or can support a different wireless communication technology. The downtilt of the antennas can be electrically and/or mechanically controlled, and various feeder arrangements can be employed.

Abstract: A feed having a waveguide with a longitudinal axis. A plurality of corrugations extending from an end of the waveguide. The corrugations coaxial with the longitudinal axis, forming an extension of the waveguide. The corrugations having an end face angle less than 90 degrees with respect to the longitudinal axis to squint the feed beam.

Abstract: A one-dimensional electromagnetic band gap (EBG) waveguide phase shifter electronically scanned array (ESA) horn antenna utilizes a linear array of EBG waveguide phase shifters for scanning and radiating a beam. A linear array feed feeds the linear array of EBG waveguide phase shifters. A horn directs radiation from the linear array of EBG waveguide phase shifters. Each of the EBG waveguide phase shifters is a waveguide with vertical and horizontal sidewalls. EBG devices are located on the vertical waveguide walls to shift phase to scan the beam.

Abstract: An antenna comprises a polarizer, a phasing network and a field radiating element such as a horn. The polarizer and phasing network generate a plurality of phase shifted circularly polarised waves which are superimposed to produce multiple antenna field patterns from a single antenna aperture.

Abstract: A fluid antenna generator includes a first source of electrically conductive fluid and a second source of electrically conductive fluid. The first source and the second source are oriented such that, when the first source and the second source are operated, the electrically conductive fluid generated by the first source intersects the electrically conductive fluid generated by the second source. A method for generating a fluid antenna includes generating a first electrically conductive fluid portion and generating a second electrically conductive fluid portion, such that the first electrically conductive fluid portion and the second electrically conductive fluid portion intersect.

Abstract: A high frequency module for converting a high frequency wave in a free space to a high frequency wave in a planar waveguide includes two metal plates, a dielectric substrate and a planar waveguide disposed on the dielectric substrate. The dielectric substrate between the two metal plates has the planar waveguide disposed thereon, and the planar waveguide protrudes either in a through hole bored in one of the two metal plates, or in a hollow space defined by the other of the two metal plates on the dielectric substrate.

Abstract: A relatively low cost, easy to install and aesthetically pleasing digital video broadcast from satellite (DVBS) elliptical horn antenna designed as part of a reflector antenna system to receive satellite television broadcast signals with circular polarity. This type antenna may be implemented with a single antenna feed horn with multiple feed horns that may be arranged separately or in one or more integral feed horn blocks. The antennas may be designed to achieve acceptable circular polarity performance over broad and multiple frequency bands through the use of oppositely sloped differential phase differential sections.

Abstract: A horn antenna part of a radar apparatus is made of a heat emitting material and includes: an antenna body part having a plurality of horn parts arranged in an array form, wherein each horn part is open toward a front surface of the apparatus, and has a diameter which gradually increases toward the front surface; and a feeder part including a waveguide which communicates with the horn parts, wherein the feeder part is connected to the antenna body part. The radar apparatus also includes: a wireless part for generating a high-frequency signal supplied to the feeder part, and converting a reflected high-frequency signal to a medium-frequency signal; and a circuit part for controlling the high-frequency signal and processing the medium-frequency signal. At least one of the wireless part and the circuit part is arranged in a manner such that it contacts the feeder part.

Abstract: A relatively low cost, easy to install and aesthetically pleasing digital video broadcast from satellite (DVBS) elliptical horn antenna designed to receive satellite television broadcast signals with circular polarity. This type antenna may be implemented as a multi-beam, multi-band antenna with closely spaced antenna feed horns operable for simultaneously receiving signals from multiple satellites that are closely spaced from the perspective of the antenna.

Abstract: Provided is a horn antenna for circular polarization using a planar radiator. The horn antenna has a simplified and miniaturized structure by substituting a function of a providing signal power to the horn antenna with a function of a circular polarizer which induces circular polarization by using the planar radiator. The horn antenna includes: a horn for radiating signal power; and a planar radiator for providing the signal power to the horn to thereby induce circular polarization, the radiator including a radiating patch.

Abstract: A multibeam primary radiator apparatus (2) includes first, second and third primary horns (16, 18, 20). The first primary horn (16) has a generally circular proximal end aperture (22) at its proximal end, and a generally circular distal end aperture (24) at its distal end, which is larger than the proximal end aperture (22). The second and third primary horns (18, 20) have generally circular proximal end apertures (26, 28) at their proximal ends, and larger distal end apertures (30, 32) at their distal ends. The first through third primary horns are disposed with the center axes of the respective proximal end apertures being substantially in parallel with each other. The distance between the center axis of the first primary horn (16) and each of the second and third primary horns (18, 20) is smaller than the diameter of the proximal end aperture (22) of the first primary horn (16).

Abstract: A feedhorn, a radio wave receiving converter, and an antenna that can be reduced in size and have high reliability can be obtained. A feedhorn portion constitutes part of a converter, and includes a chassis body with a waveguide having an opening, a dielectric as a dielectric member connected to the opening, and a waterproof cover as a protective member. The waterproof cover covers the dielectric and contacts (tightly attached) to a portion of the surface of the dielectric (in the dielectric, the portion of the surface away from waveguide). The waterproof cover is formed of a material having substantially the same electric characteristics (permittivity and dielectric loss tangent) as the material forming the dielectric.

Abstract: A method and apparatus for receiving signals transmitted from a plurality of communications satellites. An apparatus in accordance with the present invention comprises a reflecting surface having a focal point, and a plurality of low noise block down converters with feedhorns (LNBFs), each LNBF having a boresight, wherein at least a first LNBF receives signals in a first frequency band transmitted from a first communication satellite location that are focused at a first focal point and at least a second LNBF receives signals in a second frequency band transmitted from a second satellite location that are focused at a second focal point, wherein the boresight of the first LNBF is closer to the first focal point than the boresight of the second LNBF is to the second focal point.

Abstract: A method for making a horn antenna array includes the steps of making first and second equal-size printed-circuit half-horn-elements, and offset-juxtaposing element pairs to make horn elements having a dielectric lip or step. A ground plane defining mutually intersecting crossed slot sets is loaded with horn elements with their lips interlocking near the slot crossings, to define the horn antenna array. The horn elements can be fed by pins extending through portions of the ground plane and into an aperture adjacent the feed elements of the horn elements. Electrical connections are made by fusion joining after the array is assembled.

Abstract: An antenna horn having multiple flared sections with their slopes and lengths selected to enhance desirable electromagnetic modes and to suppress undesirable modes at the horn aperture, thereby increasing the aperture efficiency and antenna gain.

Abstract: A feedhorn driving method and apparatus allows the establishment of multiple phase centers using only a single multimode feedhorn. At least two higher-order modes are extracted from the feedhorn and weighted in amplitude and phase. The phase center separation is established in accordance with an assigned weights. The feedhorn has application in i.a. moving target indication systems.

Abstract: As provided herein, a dual- or quad-ridged broadband horn antenna may include a pair of conductive antenna elements arranged opposite one another for guiding an electromagnetic wave in a longitudinal direction through the horn antenna. In some cases, the pair of conductive antenna elements may include substantially convex inner surfaces and appropriately shaped outer surfaces. The convex inner surfaces may generally function to direct or guide the radiated energy without disturbing the intended radiation pattern. To maintain the intended radiation pattern, the broadband horn antenna may also include a pair of tapered extension elements, each coupled to an outer surface of a different one of the antenna elements at one end thereof. In some cases, a magnetic material may be arranged upon at least a portion of the antenna elements to restrict surface currents to flowing along the inner surfaces only.

Abstract: A feed horn structure in which a feed horn and a horn cap can be combined and, a manufacturing method thereof. A converter having that feed horn structure, and a satellite communication receiving antenna can be obtained. The feed horn structure of a satellite communication receiving converter includes a cylindrical feed horn receiving a radio wave from an antenna portion and guiding the radio wave, and a horn cap fixed to the feed horn so as to surround one end of the feed horn at antenna side. The feed horn and the horn cap are integrated by integral molding.

Abstract: A feed window for a feed assembly having at least one primary feed operating at a primary frequency band and at least one secondary feed operating at a secondary frequency band. The feed window sealing against the feed assembly, enclosing an open end of the feeds. A feed window surface of the feed window supported by and spaced away from the feed assembly by a feed window wall. The feed window surface of the feed window generally parallel to a launch edge of the feeds. The feed window may include an insert positioned between the feed window surface and the feeds. An insert aperture may be applied to the insert, corresponding to a feed view window of one of the feeds.

Abstract: An oscillator. In the illustrative embodiment, the oscillator includes an ortho-mode feed; a reflective amplifier array adapted to be illuminated by the feed with an input wavefront with a first polarization and to return thereto an amplified wavefront with a second polarization orthogonal to the first wavefront; and a partially reflective plate disposed between the feed and the amplifier. The inventive oscillator provides a Fabry-Perot cavity between the feed and the plate. In the illustrative embodiment, the plate is a polarized plate. The plate may have surfaces with dissimilar polarizations and/or curvatures. The amplifier may be phase locked by an ortho-mode converter or other arrangement.

Abstract: A DRA with preferentially controlled grading lobes is described. The DRA comprises a plurality of elements, collectively defining a main lobe nearest the DRA boresight and a set of grating lobes near the main lobe, wherein each of the grating lobes in the set of grating lobes is angularly displaced from the main lobe by a grating lobe angle that varies asymmetrically about that main lobe. In one embodiment, the plurality of elements comprises a first row of elements extending in a first direction that is tilted relative to the Northerly direction by an angle ?, and a second row of elements, parallel to the first row of elements, the second row of elements offset from the first row of elements in the first direction by a stagger distance S.

Abstract: A monoconical antenna comprises: a substantially conical concavity formed in one end face of a dielectric; a radiation electrode provided on the surface of the concavity; and a ground conductor provided in proximity to and substantially in parallel with the other end face opposite the one end face of the dielectric. The monoconical antenna is so constituted that electrical signals are fed to between the near vertex region of the radiation electrode and the region of the ground conductor. The half-cone angle ? of the substantially conical concavity formed in the one end face of the dielectric is determined by a predetermined rule corresponding to relative dielectric constant ?r. Thus, the quality of wideband characteristics inherent in the monoconical antenna can be sufficiently maintained, and further size reduction can be accomplished by dielectric loading.

Abstract: A beam-forming antenna system includes an array of integrated antenna units. Each integrated antenna unit includes an oscillator coupled to an antenna. A network couples to the integrated antenna units to provide phasing information to the oscillators.

Abstract: A radar horn antenna in which, to reduce or remove unnecessary echo from a specific angular range such as ground clutter, divergence in axial direction of a horn antenna 8 accommodated in a casing and covered with a radome is asymmetrical with respect to the axis of the horn antenna so that a maximum radiation direction in a radiation pattern of the horn antenna is deviated from front to another and/or gain in the specific angular range is controlled.

Abstract: An object of the invention is to provide a slot array antenna in which unstable factors for contact of an adjustment portion comprising a slot waveguide and a waveguide holder are removed, a number of parts is decreased to save weight, and assembly is simplified. Accordingly, this invention is to constitute a radiation portion (1) unitedly formed of a slot waveguide (1a), a flare holder (1b), and a supporting portion (1d), if necessary, further adding a screen holder (1c) for a screen (4) for cross polarization suppression. Furthermore, this invention is to constitute a reinforcement feeder (2) unitedly formed of a feeder waveguide (2a), a reinforcement portion (2b) and a reinforcement connector (2c) in the case of an open type antenna.

Abstract: A low radar cross-section monocone antenna is provided with an ultra-wide bandwidth in the microwave region of the electromagnetic spectrum running from 1 gigahertz to 18 gigahertz by decreasing the low frequency cutoff through enlarging the overall dimensions of the cone while at the same time maintaining the base diameter of the apex of the cone to the initially-set dimension that establishes the high frequency cutoff of the antenna. The apex of this cone that serves as its feed point has a base diameter that results in the wide bandwidth, with the monocone antenna having a 5 dBi gain and omnidirectional coverage.

Abstract: A radio wave reception converter receives a radio wave and converts the radio wave into an electric signal, and includes a horn introducing a radio wave, and a waveguide arranged at the rear of the horn for guiding a radio wave introduced by the horn. An insulation sheet is located between the waveguide and the horn to seal hermetically the interior of the waveguide and the horn. The connecting part between the waveguide and the horn is covered with an exterior cabinet. The front opening of the horn is covered with a feedome. The structure facilitates the connecting work between the waveguide and the horn, and can ensure airtightness at the connecting part.

Abstract: A feedhorn, a radio wave receiving converter, and an antenna that can be reduced in size and have high reliability can be obtained. A feedhorn portion constitutes part of a converter, and includes a chassis body with a waveguide having an opening, a dielectric as a dielectric member connected to the opening, and a waterproof cover as a protective member. The waterproof cover covers the dielectric and contacts (tightly attached) to a portion of the surface of the dielectric (in the dielectric, the portion of the surface away from waveguide). The waterproof cover is formed of a material having substantially the same electric characteristics (permittivity and dielectric loss tangent) as the material forming the dielectric.