Wave transmission lines and networks – Long lines – Strip type
Patent
1987-04-23
1989-01-31
LaRoche, Eugene R.
Wave transmission lines and networks
Long lines
Strip type
333246, 174117FF, 174 36, H01P 308
Patent
active
048019054
ABSTRACT:
A shielded printed circuit board system is described in which a microstrip transmission line secured to the surface of a dielectric substrate between ground planes is shielded to isolate the microstrip and inhibit the escape of electromagnetic radiation. This system reduces crosstalk in printed circuit boards and also reduces coupling of external fields into the signal path, thus allowing more sensitive measurements. The shield member is conductive and includes a body section and downwardly depending leg members. The leg members are secured to ground planes on each side of the microstrip transmission line. In another embodiment a dimensionally stable support plate (e.g., an aluminum plate) is secured over the shield member.
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Ham Seung
Hewlett--Packard Company
LaRoche Eugene R.
Miller Edward L.
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