Process control instrument intrinsic safety barrier

Details Process control instrument intrinsic safety barrier Process control instrument intrinsic safety barrier

2005-12-27

2005-12-27

Cao, Huedung X. (Department: 2821)

Communications: radio wave antennas

Antennas

With coupling network or impedance in the leadin

Reexamination Certificate

active

06980174

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.

REFERENCES:
patent: 6640084 (2003-10-01), Pande et al.
patent: 6642902 (2003-11-01), Gustafson
patent: 6906668 (2005-06-01), Rawnick et al.

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