An antenna system having an array of radiating elements arranged in element modules is provided with coupling networks, one associated with each element module, each network having an input port. Each coupling network provides coupling between its input port and elements in the associated element module, as well as independent coupling between its input port and selected elements associated with other modules in the array.

A horn antenna is disclosed having a built-in circular polarizer and a cross polarization attenuator. A square-apertured horn antenna has a plurality of pairs of conductive fins disposed along opposite edges of the horn interior. The individual fins are separated from each other by approximately one-fourth wavelength. The fins are at a 45 degree angle to that linear wave and react with that linear wave by imparting a circular rotation to that wave as the wave propagates past each pair of fins. A...

The present invention relates to polarization grids for use in offset antenna arrangements, each of the grids comprising a plurality of nonparallel spaced-apart elements which are mounted between an offset curved focusing main reflector and an associated feedhorn in order to obtain linear polarization everywhere in the far field of the reflector. Exemplary types of grids in accordance with the present invention are (1) a family of hyperbolae on an arbitrary plane S, (2) projections of these hype...

The rear wall of a horn antenna is a substrate with a phase shifter circuit thereon. Power from the phase shifter is radiated by the horn via a probe that has the general shape of a hook.

An adjustable mobile antenna comprising an upper metal mast and a lower metal mast, the upper mast being telescopically received in the lower mast and adjustably movable longitudinally therein to vary the length of the antenna and thereby effect tuning thereof, a clamping member for releasably locking the upper mast in a selected position relative to the lower mast, a dielectric rod extending upwardly from the upper end of the upper metal mast, and a loading coil helically wound on the dielectri...

An apparatus for determining the relative position and orientation of an object by automatic equipment. The objects are transported in a first movement direction on a translucent conveyor belt. A line array of photodiodes is arranged transversely to the belt. The electrical condition of these diodes is scanned in synchronism with the movement of the belt. The extreme signals in the longitudinal and the transverse direction of the belt indicate the tangent points of two sets of mutually parallel,...

Disclosed are control modules for use in systems utilizing flexible, optical fiber bundles, which control modules include an optical switch and an optical receiver. Each is provided with quick-disconnect fittings for receipt of optical fiber bundles. Also disclosed is a control system for an apparatus including a machine having mechanical parts which perform a series of operations wherein the control inputs to the machine are generated by the control modules operated in response to mechanical mo...

A control circuit for tracking of a heat radiation source which functions to maintain heat collection structure in optimum alignment with the source thereby to enable maximum efficiency of heat collection; the control circuit includes a threshold circuit for sensing ambient light level to provide enablement control to A-C power circuitry which energizes the heat collector orienting drive system, and the threshold circuit also functions to automatically invert the heat collector to a protected po...

A curve line reader of the type wherein a recording medium carrying an optically visible curve line is caused to move relatively to an electronic camera tube which electronically scans an optical image of the medium along a locus extending transversely of the recording direction to generate a video output signal containing pulses produced by the impingement of the tube scanning beam upon the curve line image is modified by the addition of a semicylindrical optical lens having a length at least e...

An antenna mounting structure is supported and oriented by three linear hydraulic actuators responsive to linear position transducers of a passive stabilization system serving as a vertical reference for keeping an antenna precisely pointed at a geostatically satellite during motion disturbances. The antenna is assembled with each of the linear actuators connected thereto through a gimbaled mount which facilitates accommodation of the requisite angulation thereof necessitated by motion in adjace...