Waveguide device (1) for guiding a radio frequency signal at a given frequency f, the device (1) including: a core (3) manufactured by additive manufacturing and including side walls with inner and outer surfaces (7, 8), the inner surfaces (7) delimiting a waveguide channel (2), wherein a cross-section of the channel (2) has two straight sides joined together by two half-portions, at least one of the two half-portions being rounded or formed of at least two straight segments the cross-section having a maximum length (a) and a maximum width (b), the ratio between the maximum length (a)/maximum width (b) being between 2.05 and 3.5, preferably between 2.05 and 2.4.

Waveguide device (1) for guiding a radio frequency signal at a given frequency f, the device (1) including: a core (3) manufactured by additive manufacturing and including side walls with inner and outer surfaces (7, 8), the inner surfaces (7) delimiting a waveguide channel (2), wherein a cross-section of the channel (2) has two straight sides joined together by two half-portions, at least one of the two half-portions being rounded or formed of at least two straight segments the cross-section having a maximum length (a) and a maximum width (b), the ratio between the maximum length (a)/maximum width (b) being between 2.05 and 3.5, preferably between 2.05 and 2.4.

Disclosed herein is a waveguide cell having a helical cavity. The waveguide cell has a central axis and a cavity having a transverse cross section whose rotational position about the central axis varies along the central axis. There is also disclosed a method a determining the shape of a waveguide cell.

Disclosed herein is a waveguide cell having a helical cavity. The waveguide cell has a central axis and a cavity having a transverse cross section whose rotational position about the central axis varies along the central axis. There is also disclosed a method a determining the shape of a waveguide cell.

An elongate flexible waveguide section for radio frequency signals is provided, wherein the waveguide section is corrugated in the longitudinal direction, and the waveguide section is at least partially corrugated in a circumferential direction perpendicular to the longitudinal direction. Also provided is an apparatus for connecting a VHTS antenna system to a spacecraft.

An elongate flexible waveguide section for radio frequency signals is provided, wherein the waveguide section is corrugated in the longitudinal direction, and the waveguide section is at least partially corrugated in a circumferential direction perpendicular to the longitudinal direction. Also provided is an apparatus for connecting a VHTS antenna system to a spacecraft.

Provided is a band-pass filter that includes a plurality of resonators that are electromagnetically coupled to each other. At least one of the plurality of resonators is a specific resonator to which a signal is input from outside or that outputs a signal to the outside. The specific resonator includes a conductor pin, a first surrounding conductor that surrounds the conductor pin in a radial direction, a dielectric that is positioned between the conductor pin and the surrounding conductor, a second surrounding conductor that surrounds the dielectric in an axial direction of the conductor pin, and an intermediate conductor that extends in a direction crossing the axial direction of the conductor pin and that electrically connects the conductor pin to the first surrounding conductor or the second surrounding conductor.

Provided is a band-pass filter that includes a plurality of resonators that are electromagnetically coupled to each other. At least one of the plurality of resonators is a specific resonator to which a signal is input from outside or that outputs a signal to the outside. The specific resonator includes a conductor pin, a first surrounding conductor that surrounds the conductor pin in a radial direction, a dielectric that is positioned between the conductor pin and the surrounding conductor, a second surrounding conductor that surrounds the dielectric in an axial direction of the conductor pin, and an intermediate conductor that extends in a direction crossing the axial direction of the conductor pin and that electrically connects the conductor pin to the first surrounding conductor or the second surrounding conductor.

A wireless waveguide system for a heating, ventilation, and air conditioning (HVAC) system. The wireless waveguide system includes a sensor that detects an environmental condition and directs a signal indicative of the environmental condition along an interior of a ductwork. A signal sensor detects a strength of the signal within the interior of the ductwork. A repeater that operates based on the strength of the signal detected by the signal sensor and repeats the signal along a communication path at least partially within the interior of the ductwork to a controller of an HVAC unit.

A terahertz hollow core waveguide includes several successively cascaded waveguide units, and the waveguide units includes fiber core and cladding. The fiber core is composed of air, and the cladding is composed of dielectric rings, air rings, support strips, and an outer cladding. The medium rings and the air rings are successively surrounded on the outside of the fiber core, and the outer cladding is surrounded on the outside of the outermost air ring. All support strips in the same air ring of the same waveguide unit form a support strip group, and the support strips in the support strip group are arranged along the circumferential direction to connect two adjacent dielectric rings in the same waveguide unit or to connect the outermost dielectric ring and the outer cladding in the same waveguide unit.