Process control instrument intrinsic safety barrier
US6980174B2 · kind B2 · utility
14Cited by
3References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 30, 2003 |
| Grant date | Dec 27, 2005 |
| Priority date | — |
| Expiry date | Jan 11, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q23/00
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A process control instrument includes a circuit board having a control circuit for generating or receiving a high frequency signal. An antenna includes an electrical conductor. An intrinsic safety circuit couples the control circuit to the antenna and comprises a microstrip transmission line on the circuit board electrically connecting the control circuit to the electrical conductor. A safety stub has a first end electrically connected to the transmission line proximate the electrical conductor and a second end connected to a ground of the control circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.