Abstract: A flat panel antenna array for generating multiple beams across a wide frequency band. Radiating elements and feeds are supported on radiator boards disposed in parallel planes, all perpendicular to a network board that supports a time delay structure, such as a Rotman lens, to phase the signal fed to respective radiating elements in order to form beams pointing in specified directions. Ground sheets, parallel to the network board and back structure of the antenna, interlock with a narrowed region of the radiator boards and with cross braces, providing mechanical support and overlap to reducing cross-polarized radiation otherwise coupled by slots in the ground sheets.

Abstract: A modular array antenna. The antenna has a plurality of radiating elements fed by a hybrid waveguide/stripline network that includes a waveguide power splitter for coupling power into the stripline network. Components of the array antenna may be substituted for selecting polarization and beamwidth.

Abstract: A method and apparatus for linkage adjustment. In an embodiment, the adjustable linkage includes a first component, a second component and locking device. The first component has a plurality of spaced slots and a connector for connecting to an object. The second component also has a plurality of spaced slots and a connector for connecting to a second object. The locking device holds the first component and the second component in a fixed relative position. The components are positioned so a first slot from the first component overlaps with a first slot from the second component. A lever may be inserted through the first slot of the first component and into the first slot of the second component to apply a prying force. The prying force relatively repositions the components such that a second slot from the first component is brought into overlapping relationship with a second slot from the second component.

Abstract: A microwave antenna feed spoiler for reducing side lobes of a microwave antenna with a feed support. The microwave antenna feed spoiler provides one or more segments of electrically conducting surface forming a roof which is coupled to and hides beneath it at least a portion up to the whole length of the feed support.

Abstract: An omnidirectional antenna with minimal gain variation over the 360.degree. azimuth. A plurality of biconical antennas are stacked vertically. A radome covering the antenna and cylindrically encasing the antenna supports the stack of biconical antennas. A bundle of transmission lines is helically wound about the cylindrical periphery of the biconical antennas, preferably at an angle between 37.degree. and 41.degree.. Each biconical antenna is formed by two truncated flared apart reflecting surfaces that are connected by a nonconductive spacing collar between their truncated portions.

Abstract: A conical horn microwave antenna has a reflector positioned at the large end of a conical feed horn which has the side walls of the horn wider than the projected effective area of the reflector such that microwave absorber material lining the feed horn does not obstruct wave propagation between the feed horn and the effective reflector area.

Abstract: A thin sheet is formed into a surface having compound curvature by vacuum forming the sheet against an array of support posts which have been adjusted to define the locus of the desired surface. A rigid frame is placed on the exposed back surface of the sheet and bonded thereto while the vacuum formed shape is maintained. Alternatively, a frame of beam members kerfed to make them compliant is placed on the back surface and bonded to the sheet which restores the structural integrity of the beams by briding the kerfs.