Device including a passive coupler circuit phase shifting through 180.degree.
US5886591A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 13, 1997 |
| Grant date | Mar 23, 1999 |
| Priority date | — |
| Expiry date | Mar 13, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H7/18
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A device includes a passive coupler circuit with lumped elements for coupling a first A.C. signal having a given center frequency (fo) present on a first primary port (P1) to two second A.C. signals phase shifted through 180.degree. present on two secondary ports (P3, P4). The device has a first and a second elementary circuit (B, B') phase shifting through 180.degree. respectively, a differential input terminal (1, 1') and a summation input terminal (2, 2') and first and second output terminals (3, 4; 3', 4'), elementary circuits being connected to each other so that the differential input terminal (1) of the first circuit (B) feeds first primary port (P1), the differential input terminal (1') of the second circuit (B') feeds a second primary port (P'1) connected to ground via an impedance (Zo), the output terminals (3, 4; 4', 3') of the first and second circuits (B, B') are coupled crosswise respectively, and feed said secondary ports (P3, P4), and the summation input terminals (2, 2') are short-circuited.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.