An antenna comprises a pair of planar layers that are stacked in a direction perpendicular to a pair of layer planes along which the pair of planar layers extend and a separation layer at least partially separating the pair of planar layers. The pair of planar layers each end at a common layer end face and each provide a waveguide for transmission of electromagnetic waves parallel to the pair of layer planes. The waveguides end at the common layer face.

A microwave-frequency power-transmission window assembly includes a microwave-frequency power-transmission window comprising: two tubes each having two parallel oblique planar cross sections, one oblique planar cross section being non-perpendicular to the central axis of the tube and being of constant thickness in the oblique planar cross section; and an optical plate assembled between the two respective ends of the two tubes positioned facing one another; a tubular extension element extending the microwave-frequency power-transmission window; two centring rings that centre the microwave-frequency power-transmission window in the tubular extension element; and an external housing equipped with two transparent portions positioned at the ends of the microwave-frequency power-transmission window tubular extension element.

A Cubesat uses both rail rods, walls, or both as an antenna. Either the rail rods and/or walls may form a rectangular waveguide, and may have one or more slots that allow energy to leak and radiate in a predefined direction in space.

A transmission line includes a post-wall waveguide which includes a dielectric substrate on which a pair of post-walls is formed and a first conductor layer and a second conductor layer opposed to each other with the dielectric substrate interposed therebetween and in which a region surrounded by the pair of post-walls, the first conductor layer, and the second conductor layer is a waveguide region, a waveguide tube having a hollow rectangular shape, being connected with the first conductor layer so as to cover an opening portion formed in a side wall, and in which an inside communicates with the waveguide region through an opening formed in the first conductor layer, and a wire member which is arranged such that through the opening, a first end is located inside the dielectric substrate and a second end is located in the waveguide tube.

A waveguide apparatus comprises an input port having a rectangular cross-section in a plane perpendicular to a direction of propagation. The rectangular cross-section has a short side and a long side. The waveguide apparatus further comprises a plurality of resonant cavities, coupled with the input port, including a first resonant cavity and a second resonant cavity diagonally disposed with respect to each other in the plane perpendicular to the direction of propagation. Each resonant cavity has a square cross-section in the plane perpendicular to the direction of propagation. The waveguide apparatus further comprises an output port coupled with the plurality of resonant cavities on a side opposite the input port. The output port has a rectangular cross-section with a short side and a long side, wherein the short side of the output port's cross-section is perpendicular to the short side of the input port's cross-section.

A transmission line includes a post-wall waveguide which includes a dielectric substrate on which a pair of post-walls is formed and a first conductor layer and a second conductor layer opposed to each other with the dielectric substrate interposed therebetween, and in which a region surrounded by the pair of post-walls, the first conductor layer, and the second conductor layer is a waveguide region, a waveguide tube having a hollow rectangular shape, being connected with the first conductor layer to cover an opening portion formed in a side wall, and in which an inside communicates with the waveguide region through an opening formed in the first conductor layer, a blind via formed in the dielectric substrate such that one end is disposed inside the opening, and a pole member including a post member connected to the one end of the blind via and a support member supporting the post member.

A blind mate waveguide flange includes a mating surface for interfacing with a waveguide probe interface. The mating surface includes a choke flange and a first opening to one end of a waveguide transition section. The choke flange includes a choke groove separating a peripheral region of the mating surface from an inner region of the mating surface. The inner region is recessed relative to the peripheral region to provide an air gap upon mating with another mating surface. The first opening has a first shape. The blind mate waveguide flange further includes a waveguide connection interface that includes a second opening at an opposite end of the waveguide transition section for interfacing with a waveguide. The second opening has a second shape such that the waveguide transition section provides a transition from the first shape to the second shape.

A microwave mode coupling device for transferring electromagnetic (EM) energy from a first structure to a second structure while providing a pressure barrier between the first structure and the second structure, the coupling device comprising first and second transmission line sections separated by an intermediate waveguide section.

The radar system includes a split-block assembly comprising a first portion and a second portion. The first portion and the second portion form a seam, where the first portion has a top side opposite the seam and the second portion has a bottom side opposite the seam. The system includes at least one port located on a bottom side of the second portion. Additionally, the system includes radiating elements located on the top side of the first portion, wherein the radiating elements are arranged in a plurality of arrays. Yet further, the system includes a set of waveguides in the split-block assembly configured to couple each array to at least one port. Furthermore, the split-block assembly is made from a polymer and where at least the set of waveguides, the at least one port, and the plurality of radiating elements include metal on a surface of the polymer.

An apparatus with a rectangular waveguide to radial mode transition and method for using the same are described. In one embodiment, the apparatus comprises a radial waveguide having at least one plate; a radio-frequency (RF) launch coupled to the radial waveguide comprising a rectangular waveguide, a rectangular waveguide to coaxial transition coupled to the rectangular waveguide, and a coaxial to radial transition coupled to the rectangular waveguide to coaxial transition.