Differential phase shifter
US4737662A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 21, 1986 |
| Grant date | Apr 12, 1988 |
| Priority date | — |
| Expiry date | Oct 21, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H11/20
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A phase shifter according to this invention comprises circuit groups on a phase advance side and on a phase retardation side in each of which N phase shifting circuits of constant amplitude are connected in cascade, and in which the time constants of the successive phase shifting circuits are set at a geometrical progression of a fixed ratio .alpha., while the time constants of the phase shifting circuits on the phase retardation side are made .beta. times greater than those of the corresponding phase shifting circuits on the phase advance side. Thus, any desired phase difference can be attained according to the value .alpha., while a desired phase difference can be attained according to the value .beta., and the limits of a frequency band width are eliminated by increasing the number of stages N of the cascade connection of each circuit group.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.