Four-port network for separating two signals comprised of doubly polarized frequency bands
US4344048A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 11, 1980 |
| Grant date | Aug 10, 1982 |
| Priority date | — |
| Expiry date | Aug 11, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01P1/2131
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A four-port network for separating signals comprised of two doubly polarized frequency bands for an antenna feeder system in directional or satellite radio operation, wherein a first polarization converter for converting linear polarization to circular polarization, and vice versa, is designed for the lowest inherent ellipticity in the lower frequency band and is connected ahead of a symmetric polarization filter for the lower frequency band, and a second polarization converter which compensates the remaining ellipticity in the upper frequency band is connected between the symmetrical polarization filter and a further polarization filter for the upper frequency band. The second polarization converter for compensating the remaining ellipticity in the upper frequency band includes two different types of wavecoupling means with the first wavecoupling means reducing the frequency dependence of the remaining ellipticity but simultaneously increasing the amount of the remaining ellipticity and the other wavecoupling means having the resulting effect that the amount of the remaining ellipticity and additionally its frequency dependence are reduced to a minimum.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.