Abstract: A base station antenna includes a reflector assembly and a linear array of radiating elements extending forwardly from the reflector assembly. The reflector assembly includes an RF choke that has a choke body and a choke cover. The choke cover at least partially covers a choke body opening so that a choke opening of the RF choke is smaller than the choke body opening.

Abstract: A segmented structure includes at least two panels, a so-called main panel and a so-called secondary panel, as well as at least one deployment device configured to move the connected secondary panel into a storage position or into a deployed position. The deployment device includes a translation system provided with at least one helical geared motor configured to translate the secondary panel relative to the main panel. The translation system further includes a rotation system configured to rotate the translation system and the secondary panel connected to the translation system, relative to said main panel.

Abstract: An array of scattering and/or reflector antennas are configured to produce a series of beam patterns, where in some embodiments the scattering antenna and/or the reflector antenna includes complementary metamaterial elements. In some embodiments control circuitry is operably connected to the array to produce an image of an object in the beam pattern.

Abstract: A tri-column antenna array architecture, containing a plurality of active radiating elements that are spatially arranged on a modified reflector structure is disclosed. Radiating elements disposed along (P1 and P2) outlying center lines are movable and provided with compensating radio frequency feed line phase shifters so as to provide broad range of beam width angle variation of the antenna array's azimuth radiation pattern.

Abstract: The invention provides a dual polarized antenna or antenna array with a first and second radiation pattern having a first and second polarization, a method for adjustment of said antenna or antenna array and a wireless communication system comprising said antenna or antenna array. The antenna or antenna array comprises a main radiating antenna element or array of main radiating antenna elements arranged above a conductive frame.

Abstract: A computing device includes a body, the body having a first and second portion. The computing device further includes a directional antenna, the directional antenna transmitting a signal having a preferred direction, the directional antenna located in the first portion of the body. The computing device further includes a reflector for reflecting the signal, the reflector located in the second portion of the body, the body having a first configuration where the first portion is aligned with the second portion such that the preferred direction is not aligned to intersect the reflector, the body having a second configuration where the first portion is aligned with the second portion such that the preferred direction is aligned to intersect the reflector.

Abstract: A mobile-beam antenna mounting comprises a supporting base, at least one reflector and a transmission and/or reception feed. The feed is mounted in the mounting so as to be immobile relative to the supporting base and the mounting also comprises a mobile support bearing the reflector, the mobile support being mounted on the supporting base with link means suitable for displacing it about at least one fixed displacement axis passing through the phase center of the feed.

Abstract: The satellite television antenna device receives a set of desired satellite identifications (IDs) from a set top box (STB). The antenna device scans the sky and locks onto a satellite candidate by measuring microwave radiation. The antenna acquires identification of the satellite candidate from a set top box (STB), if ID is possible. Then, if the candidate was identifiable, the antenna system compares the candidate's ID to the set of desired satellite IDs. If the candidate ID is a member of the set, then the satellite antenna's dish orientation is stored in memory. The antenna then attempts to acquire the remaining members of the set of desired satellite IDs until all members are acquired or no further candidates remain. If the candidate is not identifiable, or not a member of the set, then the antenna proceeds to the next satellite candidate.

Abstract: A rotatable reflector antenna system that supports on-the-move communications to and from a mobile land, airborne, or maritime vehicle with a remote communication device, such as a geostationary satellite. The antenna system can include a pillbox antenna, a line feed antenna, or an array of horn antennas that convey electromagnetic waves between a transceiver (transmitter and/or receiver) and a reflector. The reflector may be embodied as a singly curved, parabolic cylinder reflector coupled to support members in a manner that enables the reflector to rotate with respect to the antenna. The reflector can rotate in a first direction, such as an elevation rotation, and the entire antenna system including the reflector can be mounted to a turntable or other rotatable platform that rotates in a second direction, such as an azimuth rotation.

Abstract: A fringe-effect vault antenna includes a communications vault having a non-conductive cover disposed substantially at ground level. An antenna element is positioned in the communications vault. A metallic reflector has an edge, positioned substantially parallel to the ground, where the metallic reflector and the edge are configured to cause an edge diffraction, or “fringe-effect” upon the RF fields of the antenna to cause those RF fields to diffract in a direction toward the ground.

Abstract: A mission-flexibility antenna includes a reflector and at least a first source and a second source of radiofrequency signals, which sources are arranged in front of the reflector, the reflector having a focal point and each source having a phase center, and wherein the sources are independent, fixed and connected to separate radiofrequency feed systems defining different and predefined polarization and/or operating frequency characteristics, and in that it additionally includes means of displacement and orientation of the reflector from a first position in which the focal point of the reflector is placed at the phase center of the first source to a second position in which the focal point of the reflector is placed at the phase center of the second source.

Abstract: A variably controlled stagger antenna array architecture is disclosed. The array employs a plurality of driven radiating elements that are spatially arranged having each radiating element or element groups orthogonally movable relative to a main vertical axis. This provides a controlled variation of the antenna array's azimuth radiation pattern without excessive side lobe radiation over full range of settings.

Abstract: A tri-column antenna array architecture, containing a plurality of active radiating elements that are spatially arranged on a modified reflector structure is disclosed. Radiating elements disposed along (P1 and P2) outlying center lines are movable and provided with compensating radio frequency feed line phase shifters so as to provide broad range of beam width angle variation of the antenna array's azimuth radiation pattern.

Abstract: An antenna adapted for wireless networks and having a variably controlled stagger antenna array architecture is disclosed. The antenna array contains a plurality of driven radiating elements that are spatially arranged having each radiating element or element groups orthogonally movable relative to a main vertical axis so as to provide a controlled variation of the antenna array's azimuth radiation pattern.

Abstract: An integrated compact antenna device and method of aiming an electromagnetic signal using the integrated compact antenna device are described. The integrated compact antenna device be a vertically mounted cylinder enclosing an antenna, some electronic circuitry and most of the directional alignment mechanism. During alignment, the cylinder of the ICA rotates to provide azimuth. The cylinder is attached to a fixed base that remains stationary relative to the mounting structure.

Abstract: A participatory athletic event timing system based on backscattering modulation in the UHF band and including wirelessly encoding writable data tags with participant's bib numbers or a calculated derivative thereof for timing participants in a participative athletic event, and attaching the data tags to the participant's bibs for distribution of the bibs and data tags to participants so as to eliminate the need for matching data tags with bibs and maintaining the sequenced order of the matched data tags and bibs. In a preferred embodiment, when participants register for the event, they are assigned an ID number and a bib printed with that number and having attached to the bib one or more data tag encoded in the tags memory the ID number or a calculated derivative thereof. Before the start of the event, the athlete pulls the data tag from the bib and attaches it to their shoe.

Abstract: An adjustable antenna baffling system includes a mounting plate for antenna radiating elements, baffles, connecting links that connect the baffles to the mounting plate, limit brackets that limit movement of the connecting links, an actuator and a housing. Pushing or pulling a handle on the actuator rotates the connecting links and extends or retracts the baffles to adjust the beamwidth. The housing encloses the components of the system except the handle and a lock tab on the mounting plate. The handle is secured to the lock tab to lock the baffles in the selected position.

Abstract: For two-dimensional imaging of scenes through continuous passive or active microwave scanning, use is made of a fully mechanized directional antenna array comprising a main reflector (1), a primary radiator array (3) and a subreflector (2) having a small size in comparison to the main reflector and being tilted relative to the optical axis (7) of the directional antenna array. First drive means (8) are operative to rotate the subreflector (2) about the optical axis (7), and second drive means (17,18) are operative to move the total directional antenna array in a direction approximately vertical to the optical axis (7). The moving speed of the subreflector (2) is very high in comparison to that of the total directional antenna array.

Abstract: A fringe-effect vault antenna includes a communications vault having a non-conductive cover disposed substantially at ground level. An antenna element is positioned in the communications vault. A metallic reflector has an edge, positioned substantially parallel to the ground, where the metallic reflector and the edge are configured to cause an edge diffraction, or “fringe-effect” upon the RF fields of the antenna to cause those RF fields to diffract in a direction toward the ground.

Abstract: The invention provides a dual polarized antenna or antenna array with a first and second radiation pattern having a first and second polarization, a method for adjustment of said antenna or antenna array and a wireless communication system comprising said antenna or antenna array. The antenna or antenna array comprises a main radiating antenna element or array of main radiating antenna elements arranged above a conductive frame.

Abstract: An antenna device includes a dielectric substrate, an electric supply line that includes a microstrip line and is formed on the dielectric substrate, an antenna element that includes a microstrip line and is formed on the dielectric substrate, and a reflector plate disposed on the dielectric substrate at a predetermined angle of inclination. The reflector plate is allowed to move relative to the dielectric substrate while keeping the predetermined angle of inclination.

Abstract: A wireless networking adapter that incorporates a Yagi-style directional antenna preferably includes at least one driver element positioned between a reflector element and at least two director elements. Another embodiment of the invention comprises a wireless access point having Yagi-style antenna that includes a driver that is adapted to rotate between a first position, in which the driver is in phase with the reflector an at least two directors, and a second position, in which the driver out of phase with a reflector and at least two directors.

Abstract: An antenna array with azimuth beam width that can be continuously augmented through on-axis rotation of a single-column or a dual-column linear array is disclosed. Alternate radiating elements in the vertical direction are arranged on separate reflectors which are movable to change their angle in the azimuth to alter beam width.

Abstract: An antenna adapted for wireless networks and having a variably controlled stagger antenna array architecture is disclosed. The antenna array contains a plurality of driven radiating elements that are spatially arranged having each radiating element or element groups orthogonally movable relative to a main vertical axis so as to provide a controlled variation of the antenna array's azimuth radiation pattern.

Abstract: A dual-band, dual-polarization LOS/SATCOM antenna having a plurality of omnidirectional elements surrounding a directional element. When the antenna is in an omnidirectional radiating mode, the directional element is disconnected from the circuit and only the omnidirectional elements radiate. The directional element has radiators at one end. When the antenna is in a directional mode, the omnidirectional elements fold out to be perpendicular to the transmission axis and serve as reflectors for the driving radiators, which also fold to be perpendicular to the transmission axis. The radiators and elements are adjustable in length to provide added gain.

Abstract: An antenna apparatus, which can increase capacity in a cellular communication system or Wireless Local Area Network (WLAN), such as an 802.11 network, operates in conjunction with a mobile subscriber unit or client station. At least one antenna element is active and located within multiple passive antenna elements. The passive antenna elements are coupled to selectable impedance components for phase control of re-radiated RF signals. Various techniques for determining the phase of each antenna element are supported to enable the antenna apparatus to direct an antenna beam pattern toward a base station or access point with maximum gain, and, consequently, maximum signal-to-noise ratio. By directionally receiving and transmitting signals, multipath fading is greatly reduced as well as intercell interference.

Abstract: A self-pointing antenna has a reflector, a feed or a sub-reflector and a plurality of support struts coupled between the reflector and the boom arm and supporting the feed or sub-reflector. At least one actuator is operatively coupled with the support struts for adjusting the position of the feed or sub-reflector relative to the reflector so as to selectively adjust either/or both of the beam elevation and azimuth of a main beam axis of the antenna.

Abstract: An alignment jig 220 aids in the positioning of a horn assembly 180. The alignment jig 220 includes an upper jig arm 222, a right side jig arm 224, a left side jig arm 226, and a reference ring 240. The jig arms are positioned at the top, right side, and left side of an antenna dish assembly 100, and each contain a telescoping jig arm 228, 230, and 232. These telescoping jig arms of the alignment jig dramatically decrease the unexpanded size of the alignment jig, thereby increasing the portability of the alignment jig. The ends of the telescoping jig arms attach to the dish assembly through the use of screw clamps 234, 236, and 238. The reference ring 240 suspending from the intersecting point of the jig arms and is positioned and oriented so that it correspondingly mates with the horn assembly when the horn assembly has been properly positioned and oriented.

Abstract: A horn mount assembly 160 attaches a horn assembly 180 to a main feed leg 122 and provides adjustment on the Y-Z tilt axis and along the z-axis axis. The horn mount assembly includes a wave guide mount circular clamp 162, a flexible wave guide mount 163, a horn circular clamp 164, a feed strut attachment plate 166, a Y-Z tilt jack screw 170, and a Z-axis jack screw 172. The feed strut attachment plate attaches to the main feed leg, while the horn assembly is secured by the horn circular clamp. The flexible wave guide mount is secured by the wave guide mount circular clamp, and a flexible wave guide connects to the flexible wave guide mount. The z-axis jack screw allows the horn assembly to move along the horn transmission beam axis towards and away from the centerpoint of illumination 110 of a dish assembly 100. The Y-Z tilt jack screw allows the horn assembly to pivot in a vertical plane.

Abstract: A reflector antenna is disclosed with a main reflector and a rotatable sub-reflector that significantly reduces vibrations in the sub-reflector. The sub-reflector includes a reflecting surface located in front of the main reflector between the main reflector and a radiation source as well as a cylindrical shaft that extends in a direction parallel to a main axis of the main reflector. The sub-reflector is made of two connected parts, wherein one part includes the reflecting surface, and the other part is made of a non-reflecting material and formfittingly engages with the reflecting surface. The sub-reflector is rotatably supported on the cylindrical shaft and has a rotation speed of between approximately 1500 to 3500 rpm.

Abstract: A feed legs assembly 120 connects a horn 180 and mount assembly 160 to a back frame 60 in an antenna assembly. The feed legs assembly 120 includes a main feed leg 122, a right side feed leg 140, and a left side feed leg 142. The main feed leg includes an amp frame 124, a feed strut 126, a quick release latch 128, an amplifier 132, a mating wave guide fitting 204, a flexible wave guide 137, wave guide end fitting 208, and a horn mount attachment 138. The amp frame 124 provides a protective structure around the amplifier 132, and wave guide end fitting 204, as well as lowering the overall profile and center of balance of the main feed leg 122. The wave guide end fitting of the flexible wave guide attaches to the mating wave guide fitting of the amplifier and carries the transmission signal to the horn. The side feed legs connect to the main feed leg 122 to the back frame. The side feed legs attach to the main feed leg 122 and back frame through Hein joints 148, 150, 156, and 158 and act as long turnbuckles.

Abstract: A patch antenna is described with enhanced beamwidth characteristics. In a first embodiment, the antenna comprises a patch element and a ground plane separated from the patch element by a first dielectric layer. The antenna further includes a signal feed line separated from the ground plane by a second dielectric layer, the signal feed line being shielded from the patch element by the ground plane. The signal feed line is electromagnetically coupled to the patch element through an aperture in the ground plane lying across the signal feed line, the ground plane functioning as a finite surface relative to the aperture. According to a further aspect of the invention, the beamwidth of the antenna is adjusted by adjusting the position of a reflector behind the signal feed line. Thus, the present invention provides an efficient way to achieve adjustable wide-beamwidth for various wireless systems in a three-sector configuration.

Abstract: An easily installable signal enhancement addition for a satellite dish, and method for using an installed dish as a reference that allows installation of the enhancement without re-acquiring the satellite signal or re-aiming the dish. In one variation, the enhancement includes a reflector addition fitted with fasteners that locate the reflector against the existing dish, and use of the original feed horn, which is relocated using a support extension. This variation avoids the “shadow” of the feed horn and its support arm, and minimizes the reflective surface area at the lower end of the dish, which reduces collection of such interfering material as snow, rain, and debris. In variations using increased reflector size, the enhancement reduces loss of signal during inclement weather or in other situations in which the satellite signal is partially blocked. In one variation, the added reflector is a standard parabolic reflector superimposed over the original reflector, or replacing it on its mount.

Abstract: An antenna arrangement is provide with a variable parasitic element whose position is varied as a function of the scan angle. According to an exemplary embodiment of the invention, a variable scanning array dual polarized antenna provides different scan angles by varying phase elements of the array. According to this embodiment an adjustable phase shift mechanism is used to modify the phase of the antenna array. The adjustable phase shift mechanism is used changes the antenna's phase as a function of a moveable dielectric slab. The dielectric slab slides over a microstrip line that results in a phase change that is a function of line coverage. A parasitic element is also connected to the dielectric slab such that the position of the parasitic element is varied in response to a change in the phase shift mechanism thereby varying the canceling signal of the parasitic element to optimize port isolation for the dual polarized antenna.

Abstract: An antenna assembly for forming and directing a transmit beam, and for controlling receive and transmit beam tracking of a spacecraft in the presence of planetary aberration. The assembly includes a main reflector, a sub-reflector centered along an optical axis of the main reflector, and a moveable transmit feed for directing electromagnetic radiation along a longitudinal axis thereof. The assembly also includes an intermediate beam waveguide assembly arranged between the moveable transmit feed and the main reflector, wherein the intermediate beam waveguide assembly includes fixed and moveable optical components for guiding electromagnetic beam energy between the moveable transmit feed and the main reflector. A beam steering mechanism is coupled with the moveable transmit feed for angularly displacing the transmit beam from the optical axis by displacing the moveable transmit feed in a direction substantially orthogonal to the longitudinal axis of the transmit feed.

Abstract: A dual axis beam waveguide antenna system includes a radiator generating a beam, a mirror which directs the beam to a subreflector, which receives the beam, and a main reflector illuminated by the subreflector, which generates a collimated output. The beam waveguide of the antenna system is characterized by an azimuth axis defined by the radiator and the mirror and an elevation axis defined by the mirror and the subreflector.

Abstract: An antenna assembly for forming and directing a transmit beam, and for controlling receive and transmit beam tracking of a spacecraft in the presence of planetary aberration. The assembly includes a main reflector, a sub-reflector centered along an optical axis of the main reflector, and a moveable transmit feed for directing electromagnetic radiation along a longitudinal axis thereof. The assembly also includes an intermediate beam waveguide assembly arranged between the moveable transmit feed and the main reflector, wherein the intermediate beam waveguide assembly includes fixed and moveable optical components for guiding electromagnetic beam energy between the moveable transmit feed and the main reflector. A beam steering mechanism is coupled with the moveable transmit feed for angularly displacing the transmit beam from the optical axis by displacing the moveable transmit feed in a direction substantially orthogonal to the longitudinal axis of the transmit feed.

Abstract: A positioner (or gimbal assembly) for a compact antenna assembly is disclosed. The positioner provides accurate pointing of the antenna assembly (typically a narrow beam radio frequency (RF) radiating assembly) mounted on a rapidly moving platform. The positioner is comprised of a first, second, and third axis assemblies which support the antenna assembly and allow rotation of the antenna assembly about first, second, and third axis. The axis assemblies are arranged so the first, second and third axis are non-orthogonal and intersect at the approximate geometric center of the antenna assembly allowing continuous and independent rotation of the antenna assembly about each axis within a confined volume.

Abstract: A system and method for changing the radiation pattern of an antenna assembly of a satellite in orbit is provided. The antenna assembly includes a reflector antenna fed by a feed assembly. The reflector antenna transmits and receives signals within a radiation pattern. The reflector antenna and the feed assembly are movably mounted to a sliding mechanism so that they can be displaced with respect to one another. The displacement causes defocusing as the reflector antenna is displaced from the focus point. The defocusing causes the radiation pattern to become more compact or broadened. Thus, the radiation pattern of the satellite provided with a single reflector antenna and a single feed element may be changed while the satellite is in orbit. The system and method include gimballing the reflector antenna to steer the radiation pattern.

Abstract: A double-reflector microwave antenna of the Gregorian optics family and capable of providing an elliptical beam with a major axis that may be oriented in any desired direction of space by rotation of the sub-reflector about an axis. By adding an additional degree of freedom, that is, an independent translation of the sub-reflector and/or the main reflector along respective axes, a considerable degree of reconfigurability of the shape of the beam may be realized. In particular, the axes of the beam may be widened to vary the ratio between the axes of the elliptical beam for any orientation of the major axis or to obtain a circular beam. The inventive antenna is particularly suitable for use as on board satellites with frequency re-use in an operational environment with one or more simultaneously active beams.

Abstract: Antenna apparatus having a fixed dipole and a rotating cup. The cup is formed from a cylindrical conductor shorted at its base to a conducting plate. The fixed dipole is recessed within the cup and has a coaxial transmission line feed that penetrates through a base plate of the cup and is coupled to the dipole. The present invention achieves beam scanning by mechanically rotating only the cup, and wherein the dipole and feed remain fixed. The antenna may further comprise a second fixed dipole oriented orthogonal to the fixed dipole. The dipole feed may be a hybrid coupler network coupled by way of a plurality of coaxial transmission line feeds and a four-post balun to the fixed dipoles. The first and second crossed dipoles lie in a plane that is generally orthogonal to a central axis of the antenna. In an alternative embodiment, the dipole feed may be a turnstile, crossed-dipole feed. In another embodiment, a transmission line feed is directly coupled to a crossed dipole having asymmetrical arms.

Abstract: A parabolic antenna provided with a reflector and an arm comprises a housing fixed to a free end of the arm, a case enclosing a low noise blockdown converter ("LNB"), a feed horn protruding from a front side of the LNB case and a driving and a driven gears for adjusting an elevation angle of the feed horn. The LNB case has a pair of hinge pins. The housing has a pair of supporting members which are spaced from each other and provided with a pair of apertures into which the hinge pins of the LNB case are snugly fitted, respectively. The driven gear is engaged on one of the hinge pins of the LNB case and the driving gear is engaged on an input shaft. The input shaft rotatably passes through one of the supporting members, the driving gear and the driven gear being meshed with each other and, in turn, rotated with the input shaft, thereby allowing the elevation angle of the feed horn can be adjusted by rotating the input shaft.

Abstract: An antenna is orientable, directional and capable of use as a transmit and/or receive antenna. It includes at least one reflector, at least one source of electromagnetic radiation including means for exciting the source with two orthogonal linear polarizations and a mechanical system for positioning and holding the source and the reflector. The orientation of the antenna is made up of depointing and rotation about a preferred direction of propagation of the radiation and the mechanical system enables such rotation while keeping the source fixed, so conserving the orientation of the orthogonal linear polarization. A preferred embodiment of the antenna includes a parabolic main reflector and a hyperbolic auxiliary reflector in a Cassegrain geometry, and the mechanical system enables rotation of both reflectors about the preferred direction of radiation and holds the source fixed to conserve the orthogonal linear polarization axes of the beam.

Abstract: A parabolic antenna includes a reflector, a feed horn positioned at a focal point of the reflector, a frame fixed on a rear side of the reflector at one end, an arm on one end of which the feed horn is fixed, a pair of hinges, a boss and a shaft. The hinges extend from the other end of the arm and spaced apart from each other, and the boss extends from the other end of the frame and is interposed between the hinges. The shaft is fitted through one hinge and into the boss and the other hinge. The parabolic antenna is further provided with at least one ball stopper having a ball and a spring. The ball stopper is inserted in a blind hole formed on an inner surface of each hinge, and the spring presses the ball against the boss so that the ball is fitted into one of the recesses, thereby holding the arm and the frame at a desired angle.

Abstract: In a polarization angle adjusting mechanism for an antenna apparatus constructed of a supporting base and a transmitter/receiver apparatus equipped with a primary antenna at a right end portion thereof formed in an integral form, the primary antenna being located at a focal portion of an antenna, the supporting base has a cylindrical bearing for receiving a rotation shaft of the transmitter/receiver apparatus at a left end portion thereof, and also a plurality of subdivided projections are provided on this shaft receiving plane along a circumferential direction. On the other hand, projections and grooves fitted to a plurality of projections provided on the supporting base, which can be inserted among these plural grooves, are provided in the circumferential surface of the rotation shaft of the transmitter/receiver apparatus.

Abstract: An antenna for mobile communication includes a sleeve antenna having a feed point; at least one linear parasitic element insulated electrically form the sleeve antenna; and a supporting means for supporting the sleeve antenna and the linear parasitic element. The supporting means supports the sleeve antenna and the linear parasitic element so that the feed point of the sleeve antenna is located at a different elevation from an elevation of a central point of the linear parasitic element.

Abstract: An antenna mirror scanner for generating and directing an antenna scanner beam displaying constant polarization vectors. The antenna mirror scanner includes a non-rotating fixed-aperture antenna for transmitting and receiving an electromagnetic plane wave in a form of an antenna scanner beam and a planar reflector with a reflective planar surface. A rotational axis of the planar reflector is aligned orthogonally to a direction of propagation of the antenna scanner beam propagating towards or away from the reflective surface. A motor rotates the planar reflector to direct the antenna scanner beam incident on the reflective surface either into the non-rotating fixed-aperture antenna when the antenna mirror scanner is operating in a receive mode or from the non-rotating fixed-aperture antenna when the antenna mirror scanner is operating in the transmit mode.

Abstract: A multiband satellite communication antenna system includes a primary reflector and one or more movable subreflectors. A system with one subreflector operates at a first band when the subreflector is in a deployed position and reflects energy between a first feed and the primary antenna. When the subreflector is at a second, stowed, position, the primary reflector operates directly into a second feed. A communication antenna system with two subreflectors can operate at three bands under the conditions of having either both subreflectors stowed; the first subreflector deployed and the second subreflector stowed; or both subreflectors deployed.

Abstract: The invention provides a broadband directional antenna having a central reflector plate, a dipole and at least one side reflector panel. The dipole is arranged on the central reflector plate for radiating a radio frequency signal, including a binary feed network having a microstrip transmission line and a colinear array of radiating elements. The side reflector panel is hinged to the central reflector plate for adjusting the horizontal radiation beamwidth of the radio frequency signal.

Abstract: A novel method for calculating the surface shapes for subreflectors in a suboptic assembly of a tri-reflector spherical antenna system is introduced, modeled from a generalization of Galindo-Israel's method of solving partial differential equations to correct for spherical aberration and provide uniform feed to aperture mapping. In a first embodiment, the suboptic assembly moves as a single unit to achieve scan while the main reflector remains stationary. A feed horn is tilted during scan to maintain the illuminated area on the main spherical reflector fixed throughout the scan thereby eliminating the need to oversize the main spherical reflector. In an alternate embodiment, both the main spherical reflector and the suboptic assembly are fixed. A flat mirror is used to create a virtual image of the suboptic assembly. Scan is achieved by rotating the mirror about the spherical center of the main reflector.