Minimum phase shift microwave attenuator
US5521560A · kind A · utility
12Cited by
5References
29Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 18, 1994 |
| Grant date | May 28, 1996 |
| Priority date | — |
| Expiry date | Nov 18, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01P1/227
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A minimum phase shift microwave attenuator circuit, providing very low insertion phase change with changing attenuation levels. Three PIN diodes are biased in parallel from a common node. The PIN diodes are held at zero or reverse bias for the "no attenuation" state, and are made slightly lossy to produce the attenuation state. In the attenuation state, the PIN diodes are utilized as current controlled lossy capacitors which change resistance with applied bias, but maintain constant capacitance, thereby providing low insertion phase deviation across wide attenuation levels.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.