Abstract: A multifrequency, broadband, dual-polarized corrugated conical horn antenna is simultaneously fed a multiplicity of signals, two for each of five frequencies, with each of a pair of signals fed in each of two orthogonal planes for excitation of a desired spherical hybrid mode (HE.sub.11). The lowest frequency is fed into the horn through orthogonal pairs of colinear slots, each pair being fed by coaxial tee power dividers. Other signals are fed through a circular waveguide connected to the vertex. Band reject cavities block the next higher frequency from passing through the low frequency feed slots. The highest frequency signals are fed through orthogonal ports near the far end of the circular waveguide. The intermediate frequency signals are fed through orthogonal ports spaced along the waveguide.

Abstract: The invention relates to a microwave applicator intended to radiate a uniform power intensity to an elongated zone of which the frequency is in a predetermined range situated around a central frequency F. This applicator includes a wave guide 1 provided with a plurality of resonant slots 4 of which the centers are separated by a distance of an even number of half wave lengths .lambda.g/2, if .lambda.g is the length of guided wave corresponding to the central frequency F. The shunt slots are aligned on a longitudinal axis situated in an axial plane of the guide and are each associated with an inside post arranged in the guide on the transverse axis of said slot, so that the various slots radiate with essentially uniform amplitude. The wave guide is provided with outside posts of adjustable height penetrating into each inside post through the guide and flanges rising above the guide at the periphery of the face provided with shunt slots.

Abstract: A microwave antenna having an exponentially expanding horn of circular outlet cross-section. The inlet opening to the horn has a rectangular cross-section. In a transition region from the inlet opening up to the point at which the circular horn cross-section circumscribes the rectangular cross-section, each cross-section of the horn corresponds to the combination of the exponentially expanding circular cross-section and the rectangular cross-section.

Abstract: Disclosed is an antenna feed system for use in satellite communication systems and the like, comprising a horn with a rectangular aperture and a waveguide connected thereto. The assembly formed by the waveguide and horn is constructed from two parts secured together so that the junction lies in the longitudinal symmetry plane parallel to the electric field of the TE.sub.01 mode and is mounted for rotation about the longitudinal axis of the waveguide. The feed system further comprises a polarization converter mounted in front of the horn for rotation about the extention of the longitudinal axis of the waveguide. The converter is constructed from a plurality of layers of supporting material each provided with a conductor which forms in one direction a mainly inductive load and in a direction which is perpendicular thereto a mainly capacitive load.

Abstract: A prime focus multimode feed horn is used to illuminate a parabolic reflector such that the reflector-horn combination produces improved performance in the E-plane and H-plane of a principal aperture. A feed assembly which includes the multimode horn also has a hub assembly that is incorporated into the reflector with support structure, a boom, supporting interconnecting waveguides and the multimode dual frequency horn. Directly coupling the horn to the feed assembly is an orthomode generator connected to a receive waveguide and a transmit waveguide. The orthomode generator is assembled to a horn body waveguide that supports a horn aperture having a circular configured principal aperture surrounded by radially displaced circular rings forming concentric channels for modification of the E-plane receive pattern.

Abstract: A system for remote microwave interrogation and imaging of biological tars comprises at least one microwave, double ridged waveguide antenna probe which operates at S-band frequencies, and a high dielectric liquid medium, preferably water, in which both the probe and the target are completely immersed. For imaging applications, the probe is positioned with respect to the target such that the target is in the near field of the antenna.

Abstract: 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.

Abstract: A covert mobile communications omni-directional gain UHF antenna comprises a body having a U-shaped cavity and radiating slot, an L-shaped feed line and an end-loaded, open-circuited voltage probe. The antenna is tuneable by adjusting a pair of variable capacitors to match the impedance of the antenna to that of an attached coaxial cable and transceiver.