A conformable waveguide for conveyance of high frequency radio signals including a hollow component having a smooth interior surface and an obround cross section, the obround cross section defined as having parallel opposing sides connected by two rounded opposing ends, where the parallel opposing sides are separated by a first distance, where vertices of the two rounded opposing ends are separated by a second distance, and where the second distance is greater than the first distance.

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.

Radiating cable (100; 100a; 100b; 100c; 100d; 100e) for radiating electromagnetic energy, comprising an inner conductor (110), an outer conductor (120) arranged radially outside of said inner conductor (110), and an isolation layer (130) arranged radially between said inner conductor (110) and said outer conductor (120), wherein said outer conductor (120) comprises one or more first openings (1202), and wherein said inner conductor (110) comprises a hollow waveguide (1100).

An overmoded dielectric-lined waveguide, particularly for the 0.03 to 3 terahertz frequency range, is disclosed with performance advantages relative to prior dielectric-lined waveguides, cost and size advantages relative to corrugated waveguides, and with coupling, bandwidth, and cost advantages relative to micro-structured-fiber waveguides. It comprises a single-clad flexible microwave laminate rolled into a cylinder with its copper surface outward and its dielectric surface facing inward. The rolled laminate is supported inside a metal tube. The same method of achieving the structure needed for efficient guiding of HE.sub.11 mode may be applied to a conical tube to make a low-cost efficient overmoded tapered waveguide transition for the 0.03-3 THz range.

An overmoded dielectric-lined waveguide, particularly for the 0.03 to 3 terahertz frequency range, is disclosed with performance advantages relative to prior dielectric-lined waveguides, cost and size advantages relative to corrugated waveguides, and with coupling, bandwidth, and cost advantages relative to micro-structured-fiber waveguides. It comprises a single-clad flexible microwave laminate rolled into a cylinder with its copper surface outward and its dielectric surface facing inward. The rolled laminate is supported inside a metal tube. The same method of achieving the structure needed for efficient guiding of HE.sub.11 mode may be applied to a conical tube to make a low-cost efficient overmoded tapered waveguide transition for the 0.03-3 THz range.

A polarizer for a waveguide, comprising a main body for transmitting an electromagnetic wave, a first delay member being provided in the main body. A second delay member arranged downstream of the first delay member in the working direction (A) of the electromagnetic wave is provided in the main body, and the polarization axis (P.sub.2) of the second delay member is rotated relative to the polarization axis (P.sub.1) of the first delay member by a delay angle (β).

A polarizer for a waveguide, comprising a main body for transmitting an electromagnetic wave, a first delay member being provided in the main body. A second delay member arranged downstream of the first delay member in the working direction (A) of the electromagnetic wave is provided in the main body, and the polarization axis (P.sub.2) of the second delay member is rotated relative to the polarization axis (P.sub.1) of the first delay member by a delay angle (β).

A particle accelerator can include a first waveguide portion and a second waveguide portion. The first waveguide portion can include a first plurality of cell portions and a first iris portion that is disposed between two of the first plurality of cell portions. The first iris portion can include a first portion of an aperture such that the aperture is configured to be disposed about a beam axis. The first waveguide portion can further include a first bonding surface. The second waveguide portion can include a second plurality of cell portions and a second iris portion that is disposed between two of the second plurality of cell portions. The second iris portion can include a second portion of the aperture. The second waveguide portion can include a second bonding surface.

A particle accelerator can include a first waveguide portion and a second waveguide portion. The first waveguide portion can include a first plurality of cell portions and a first iris portion that is disposed between two of the first plurality of cell portions. The first iris portion can include a first portion of an aperture such that the aperture is configured to be disposed about a beam axis. The first waveguide portion can further include a first bonding surface. The second waveguide portion can include a second plurality of cell portions and a second iris portion that is disposed between two of the second plurality of cell portions. The second iris portion can include a second portion of the aperture. The second waveguide portion can include a second bonding surface.