Electromagnet for programmable microwave circulator
US4682126A · kind A · utility
9Cited by
12References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 1, 1984 |
| Grant date | Jul 21, 1987 |
| Priority date | — |
| Expiry date | Jun 1, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01P1/397
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A "Spacercore" design is used to provide the cores of the electromagnets which are used to bias ferrite slabs in phase shifters of a high power RF attenuator. The phase shifters require a given flux to provide a phase shift from zero to 90.degree.. With laminations of high permeability silicon steel, the core weight may be substantially reduced by including a filler comprising spacers of non-magnetic material (such as lightweight transformer pressboard. With 14-mil silicon steel laminations and 64-mil spacers, this construction provides a core which weighs 25 percent of a full ferrite core for the same flux density.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.