Abstract: An air dielectric coaxial cable in which variations in phase characteristics due to variations in ambient temperature are minimized. An insulator is formed by welding a spiral rib which is in contact along one edge thereof with the outer wall of the inner conductor to an outer pipe of the same material. The outer conductor is provided in close contact with the outer wall of the insulating pipe. The space factor of the insulator is set between predetermined limits in accordance with a disclosed technique.

Abstract: The band-pass filter coupling element of a coaxial cable is in the form of a laminent of dielectric material having a conductive layer on opposite faces. Each end face is metallurgically joined to an end face of a center conductor. A sleeve of dielectric material surrounds each center conductor. A seamless tube of dielectric material surrounds the filter elements and the dielectric sleeves. A monolithic jacket of electrically conductive metal surrounds said seamless tube.

Abstract: This disclosure deals with a three-element unit array (or stacked groups of the same) that enables the use of very large length-to-diameter dipole elements to cover broad frequency bands, greater than 2:1 in frequency ratio, by novel feed structures exciting the element gaps.

Abstract: A waveguide for the transmission of electromagnetic energy which has a low attenuation even with a small line cross-section realized by disposing in the interior of an electromagnetically shielded hollow cylinder, consisting of a substance having a low permittivity, a dielectric wire of a substance having a high permittivity. An E.sub.om -wave (m = 1, 2, 3 . . . , circular H field) is excited in the dielectric wire and the dimensioning of the dielectric wire is such, depending on the permittivities of the two substances and the particular operating frequency, that a TEM wave develops at least substantially in the space in the dielectric hollow cylinder. In the simplest case, the electromagnetic shield can consist of a metal tube and the dielectric hollow cylinder can consist primarily of air. Furthermore, the E.sub.om wave excited in the dielectric wire is preferably the E.sub.01 wave (TM.sub.01 mode).

Abstract: The power divider/combiner includes an impedance transformer arrangement coaxial of and within an outer conductor, an input/output coaxial transmission line coupled to the transformer arrangement and the outer conductor and first N-discrete, spaced transmission lines supported by a dielectric cylinder disposed coaxial of and within the outer conductor, each of the first transmission lines being coupled to the transformer means, where N is an integer greater than one. Second N-discrete, spaced transmission lines are disposed coaxial of and transverse to the outer conductor remote from the transformer arrangement, each of the second transmission lines being coupled to a different one of the first transmission lines and terminating in a common metallic disc coaxial of and adjacent the axis of the outer conductor.

Abstract: Circuit components such as frequency filters, impedance transformers, and time delay elements are fabricated into an assembly which is electrically and mechanically coupled to the center conductor. A seamless dielectric material is telescoped over the assembly and then the assembly is telescoped into a seamless outer jacket of conductive material. Then the ID of the outer jacket is reduced into contact with the dielectric material surrounding said assembly and center conductor by drawing said jacket through a die.

Abstract: An overhead transmission line composed of a coaxial line element constituted by a central conductor and an insulating sheath concentrically surrounding the central conductor; and a plurality of power current conductors of circular cross section presenting electrically conductive surface portions and disposed around the coaxial element in such a manner that adjacent current conductors contact one another and the insulating sheath, the surface regions of the power conductors which face said sheath together defining a cage-like return conductor enclosing the central conductor.

Abstract: A beam lead rod assembly for incorporation into an electromagnetic wave coaxial transmission line structure. The rod assembly comprises a beam lead holder and a beam lead device. The holder includes a cylindrical body of a dielectric material and a conductive coating surrounding each end portion of the body for conductively connecting each side of the body to a different portion of the transmission line. The conductive regions are separated by a circumferential gap so that there is no conduction between the two conductive regions. The beam lead device is disposed across the gap with opposite beam leads being conductively connected to opposite conductive regions.

Abstract: An antenna element for use in a phased array antenna is disclosed. Such antenna element is a reciprocal device adapted selectively to radiate radio frequency energy of either circular or linear polarization. Such antenna element includes waveguide means for passing radio frequency energy and for radiating such energy; and means adapted to transform the polarization of the radio frequency energy as such passes through the waveguide means to radiate such radio frequency energy selectively with either linear or circular polarization. In a preferred embodiment the just-mentioned means includes a first and a second nonreciprocal quarter-wave plate having field orientations effectively 45.degree. with respect to each other. Such nonreciprocal quarter-wave plates flank a third nonreciprocal quarter-wave plate switchable so that its field orientation is either aligned with the field orientation of the first nonreciprocal quarter-wave plate or, while still aligned as before, turned 180.degree..