US 4,680,676 AGranted

Portable radio housing with logic and RF shielding

AssigneeMotorola, Inc.

InventorsNickie A. Petratos, David Karl, William M. Bradford

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Abstract

A portable radio housing has a shield that provides electromagnetic isolation between logic and radio boards operating on close frequencies. The radio board is positioned in a conductive frame having fours sides surrounding a central opening. A tab on the frame is connected to a power module on the radio board to sink heat from the power module. A middle shield having sides with integral spring fingers at calculated intervals is attached to the frame over the rear surface of the radio board. A logic board and rear shield are attached to the frame over the middle shield. A connector protrudes through an opening in the middle shield and interconnects the logic and radio boards. A front shield, also having sides with integral spring fingers, is attached to the frame over the front surface of the radio board. The front shield has an integral speaker baffle and tabs for holding a connector. An outer housing and keypad/display module enclose the frame. Electrostatic discharge protection is provided by connecting exposed metal parts to the frame.

Claims14

Dependent claims

A housing for electromagnetically shielding electronic circuits, said housing comprising in combination:

a conductive frame having a multiplicity of sides surrounding a central opening;
a first circuit substrate having front and rear surfaces, said first substrate being positioned in said opening of said frame;
a first electromagnetic shield positioned over said rear surface of said first substrate, said first shield having front and rear surfaces and a plurality of sides substantially perpendicular to said surfaces, certain of said sides of said first shield having spring fingers contacting said frame, said first shield having an opening;
a second circuit substrate having front and rear surfaces positioned over said rear surface of said first shield;
an electrical interconnection between said first and second circuit substrates, said interconnection including first and second mating connectors respectively electrically connected to said first and second substrates, said electrical interconnection passing through said opening in said first shield;
and
a second electromagnetic shield positioned over said rear surface of said second circuit substrate.

4 more elements

Dependencies are inferred from the claim text.