Abstract: An antenna is provided that includes a mast, a first dipole, and a second dipole. The first dipole crosses with the second dipole, and the first dipole and the second dipole form a first antenna assembly that is coupled to the mast. A hybrid power divider is coupled to the first antenna assembly, and an internal feed system, positioned within the mast, is coupled to the hybrid power divider. The antenna may include a rigid coaxial internal and external feed system.

Abstract: An antenna is provided that includes a mast, a first dipole, and a second dipole. The first dipole crosses with the second dipole, and the first dipole and the second dipole form a first antenna assembly that is coupled to the mast. A hybrid power divider is coupled to the first antenna assembly, and an internal feed system, positioned within the mast, is coupled to the hybrid power divider. The antenna may include a rigid coaxial internal and external feed system.

Abstract: A slot antenna is disclosed for use in RF broadcasting. The antenna includes an elongated longitudinally extending hollow mast surrounding a longitudinal axis. An array of longitudinally spaced slots are formed in the mast for radiating electromagnetic energy therefrom. A coupler bar is associated with each slot. Each coupler bar is located within the mast between the ends of the associated slot for coupling electromagnetic energy from within the mast and developing with the slot a slot-coupler reactance. Tuning means is associated with each slot. Each tuning means is longitudinally spaced from the associated slot. Each tuning means extends inwardly from the mast toward the longitudinal axis for tuning the antenna to reduce the slot-coupler reactance.

Abstract: A slot fed antenna is disclosed for use in radiating energy. The antenna includes a flat conductive member having an elongated vertically-oriented slot dividing the member into a pair of horizontally-extending variable-length flat dipole wing elements. Each of the flat dipole wing elements has a vertically-extending rectilinear edge. Also, each wing element extends in width in a direction perpendicular to the rectilinear edge from a minimum at its center and at each of its upper and lower ends to a maximum midway between each of the ends and the center.

Abstract: An RF expansion joint is presented herein for connecting first and second axially spaced tubular conductor sections, having opposed free ends, together as the sections expand and contract with temperature variations and for providing passage of RF energy at a desired operating frequency between the sections. The joint includes an insulator sleeve which is received by the first section with the sleeve having a passageway extending longitudinally therethrough. An electrically conductive stub having proximal and distal ends is mounted to the free end of the second conductor section and extends into the passageway of the sleeve so as to be slidably received thereby. The distal end of the stub extends beyond the sleeve sufficient that the distal end is spaced inwardly from the inner wall of the first conductor section presenting essentially an open circuit to passage of RF energy.

Abstract: A transition is provided between a first rectangular waveguide and a second circular wrapped rectangular waveguide. The second waveguide takes the form of an elongated metallic annular wall having upper and lower ends and a partition member extending radially inward from the annular wall and having an inner edge located near the central axis of the annular wall. The partition member extends longitudinally for a length corresponding with that of the annular wall. An elongated metal probe is secured to the lower end of the partition member. The first rectangular waveguide has parallel rectangular broad walls interconnected by narrower walls. The first waveguide is oriented perpendicular to the central axis of the annular wall and has a circular aperture in one of the broad walls facing the lower end of the second waveguide with the aperture being in coaxial alignment with the annular wall.