Apparatus for RF shielding radio circuitry

• US 5,596,487 A
• Filed: 07/31/1995
• Issued: 01/21/1997
• Est. Priority Date: 07/31/1995
• Status: Expired due to Fees

• Current Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Gamble, Roger D., Chong, Kok H., Castaneda, Julio C., Minasi, David H.
• Primary Examiner(s): Picard, Leo P.
• Assistant Examiner(s): Vu, Phuong T.
• Application Number:
  US08/509,147
• Time in Patent Office: 540 Days
• Field of Search: 379/433-434, 379/428-429, 174/35 R, 174/35 GC, 174/35 TS, 455/89-90, 455/347, 455/300, 307/89-91, 361/753, 361/816, 361/818, 361/799, 361/800, 361/212, 361/220
• US Class Current: 361/814
• CPC Class Codes: H04B 1/3833 Hand-held transceivers
• CPC Class Codes: H05K 9/0033 disposed on both PCB faces
• CPC Class Codes: Y10S 174/35 Box or housing mounted on substrate or PCB

Abstract

First and second shielding portions (110, 112) formed of electroless plated plastic enclose a radio frequency (RF) board (108). Bosses (148) extend from inner surfaces (130, 142) of the first and second shielding portions (110, 112) to make contact with compressible ground clip members (126) located on the RF board (108).

Claims

1. A radio assembly, comprising:

a front housing;

a back housing;

an electronic circuit board having front and back surfaces;

at least one compressible ground clip member electrically coupled to the electronic circuit board;

a first electroless plated plastic shield having inner and outer surfaces and side walls extending from said inner surface, said inner surface including at least one protruding boss;

said first electroless plated plastic shield disposed about said electronic circuit board such that the side walls of the first electroless plated plastic shield enclose a predetermined portion of the front surface of the electronic circuit board, said at least one protruding boss aligning with said at least one compressible ground clip member;

a second electroless plated plastic shield having inner and outer surfaces and side walls extending from said inner surface, said second electroless plated plastic shield disposed about said electronic circuit board such that the sides walls of the second electroless plated plastic shield and the side walls of the first electroless plated plastic shield overlap and capacitively couple;

at least one screw for mechanically coupling the first electroless plated plastic shield, the electronic circuit board, the second electroless plated plastic shield, and the back housing; and

wherein the printed circuit board further comprises;

an aluminum-based fence soldered about a predetermined electrical circuit of the electronic circuit board; and

a perforated aluminum-based cover snap fitted onto the fence covering the predetermined electrical circuit.

2. A shield assembly for isolating radio frequency (RF) circuitry, the RF circuitry being disposed on a printed circuit board (pcb) having first and second surfaces, said shield assembly comprising:

a plurality of compressible ground clip members coupled to the RF circuitry on the first surface of the pcb;

a first shielding portion constructed of electroless plated plastic having an inner surface and side walls extending therefrom, said first shielding portion disposed about said pcb such that the inner surface covers the RF circuitry of the pcb and the side walls enclose the RF circuitry, said first shielding portion including a plurality of bosses protruding from said inner surface and aligning with said compressible ground clip members forming electrical ground contacts to the first shielding portion;

a second shielding portion constructed of electroless plated plastic having an inner surface and side walls extending therefrom, said second shielding portion disposed about the second surface of the pcb such that the side walls of the second shielding portion overlap with the side walls of the first shielding portion forming capacitive coupling therebetween; and

wherein the printed circuit board further comprises;

a predetermined electrical circuit;

an aluminum-based fence soldered about the predetermined electrical circuit on the pcb; and

a perforated aluminum-based cover snap fitted onto the fence covering the predetermined electrical circuit.

3. A shield assembly as described in claim 2, wherein the second surface of the pcb includes a plurality of compressible ground clip members and the inner surface of the second shielding portion includes a plurality of bosses extending therefrom, said plurality of bosses and compressible ground clip members aligning to form electrical ground contacts to the second shielding portion.

4. A shield assembly as described in claim 2, wherein the first and second shield portions and the pcb include at least one guide hole for receiving a screw to compressibly couple the first and second shield portions and the pcb.