Amir Houshang Zoufonoun

US Patent:

61783110, Jan 23, 2001

Filed:

Apr 1, 1998

Appl. No.:

9/053845

Inventors:

Gordana Pance - Sunnyvale CA
Amir H. Zoufonoun - Campbell CA

Assignee:

Western Multiplex Corporation - Sunnyvale CA

International Classification:

H04B 144
H04B 146
H04B 328
H01P 128
H01P 308

US Classification:

455 78

Abstract:

The present invention is a method and apparatus for isolating high frequency signals in a printed circuit board. A barrier strip (36) of staggered elongated grounding slots is positioned on the circuit board to prevent stray signals from leaking from one portion of the board to another. To further improve signal isolation, additional grounding holes (80) are placed around those areas where a trace on a circuit board makes the transition from one layer to another layer in a multilayer circuit board. In addition, microstrip filters (56, 58) are attached to the power or control traces of circuitry on the board at positions where the traces cross from one section of the board to another in order to filter out any stray rf signals that may be induced by the transmitter onto the power and control traces.