Filter arrangement

Details Filter arrangement Filter arrangement

1989-07-11

1990-07-31

LaRoche, Eugene R.

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

333 12, 361401, 361414, 174262, H03H 700, H05K 346, H05K 900

Patent

active

049453238

ABSTRACT:
A filter arrangement is described for filtering a plurality of conductors which are guided from a space comprising electromagnetic fields through a separating wall to a device located in a shielded space, in which the separating wall (24) is formed by a multilayer printed circuit card (86). The printed circuit card (86) comprises a continuous internal instrument ground (32). The instrument ground (32) has as signal passage means narrow apertures (102) through which feed-through conductors (108) are passed at a short distance from the edges of the apertures (102). Electrically conductive surfaces (104,106) on the layers (94,96) adjacent to the instrument ground (32) form filter capacitors with the instrument ground (32). The surfaces (104,106) are connected to the feed-through conductors (108). Filter components (62,64,70,80,82) are formed as SMD-components and mounted on the printed circuit card (26). The instrument ground (32) is guided outwards at the edges of the printed circuit card (26) and the edges of the printed circuit card (26) are copper-coated and connected to the housing (10) in a well-conductive way.

REFERENCES:
patent: 3916514 (1975-11-01), Salminen
patent: 4620264 (1986-10-01), Ushifusa et al.
patent: 4821142 (1989-04-01), Ushifusa et al.
"Surface Mounted Printed Wire Board Jumper for Unused Integrated Circuit Input Pins", IBM Tech. Dis. Bull., vol. 31, No. 3, Aug. 1988, pp. 496-497.

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