Apparatus and method for coupling r.f. energy through a mechanically rotatable joint
US4516097A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 3, 1982 |
| Grant date | May 7, 1985 |
| Priority date | — |
| Expiry date | Aug 3, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01P1/068
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
First and second annular r.f. radiating structures are mounted for concentric relative rotational motion with their r.f. radiation patterns directed toward one another. The annular r.f. radiating structures may be realized, for example, by cylindrically conformed microstrip antenna radiators which define tuned resonant cavities feeding one or more radiation apertures defined between an edge of a microstrip radiator "patch" and an underlying electrical reference or ground surface. The microstrip radiator "patch" may be either continuous in its circumferential dimensions or it may have occasional circumferential discontinuities formed by axially directed gaps therein. If the total circumferential dimension is greater than one wavelength at the intended operating frequency, then a corporate structured feedline provides plural spaced-apart feedpoints about the circumference so as to achieve a substantially uniform distribution of r.f. field amplitudes and phases about the circumference.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.