Long flexible waveguide
US3974467A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 29, 1975 |
| Grant date | Aug 10, 1976 |
| Priority date | — |
| Expiry date | May 29, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01P3/14
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A long flexible waveguide is fabricated by corrugating a thin-walled tube circular in section and then molding the corrugated tube so as to make the shape of its section substantially rectangular. The long flexible waveguide has a substantially rectangular section wherein a corrugating pitch P falls within a range of .lambda..sub.g /10<P<2 K.sqroot.D.sup.. t where .lambda..sub.g denotes a wavelength in the waveguide, K a constant, D an outer diameter of the tube before the corrugation, and t a thickness of the wall of said tube, and wherein a radius of curvature R of each inside corner of the molded tube falls within a range of h .ltoreq.R .ltoreq.0.46 b where h denotes a depth of the corrugate form of said tube, and b a dimension of said tube on the side of a minor axis of said section. Rectangular waveguide thus fabricated has excellent electric characteristics and is produced under good working conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.