Feed waveguide with ferrite rod polarizer and stepped dielectric support for matching
US5122810A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 23, 1989 |
| Grant date | Jun 16, 1992 |
| Priority date | — |
| Expiry date | Aug 23, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01P1/11
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An antenna arrangement for receiving television signals from a satellite comprises a parabolic dish which collects the signals and feeds them through a feedhorn, then through a polarization switch and to a low noise block to the receiver. The polarization switch comprises a ferrite rod supported in a dielectric holder within a circular waveguide. The ferrite rod is surrounded by a solenoid coil which is energizable to rotate the plane of polarization of the signals passed along the waveguide, so as to enable the switch to select either horizontally or vertically polarized signals. The current in the coil is switchable between two values, one having a predetermined magnitude in one direction through the coil and the other having the same predetermined magnitude but in the opposite direction through the coil. The current levels are seleced such that the corresponding angular positions for the plane of polarization are +45.degree. relative to the datum position for the polarization plane and -45.degree. with reference to this datum position. The dielectric holder has a stepped configuration so as to match the loaded waveguide to the empty waveguide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.