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Browse Prior Art Database

SLOT INSERT SHIELDING IN PORTABLE RADIO PRODUCTS

IP.com Disclosure Number: IPCOM000009434D
Original Publication Date: 1999-Sep-01
Included in the Prior Art Database: 2002-Aug-23
Document File: 8 page(s) / 300K

Publishing Venue

Motorola

Related People

Kamlesh S. Lele: AUTHOR [+3]

Abstract

Printed Circuit Board (CPB) area is at a premi- urn in today's competitive size and cost driven wire- less markets. In addition to size, time to market plays a critical role in the success of radio products. One of the design obstacles that impacts both the size and time is proper shielding. Shielding is one of the most difftcult and time consuming issues in radio product development. This invention allows for more effective use of PCB space to be utilized in component layouts by reducing the area used by sol- der down shields thus resulting in smaller radio products.

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Page 1 of 8

MOTOROLA Technical Developments

8

SLOT INSERT SHIELDING IN PORTABLE RADIO PRODUCTS

by Kamlesh S. Lele, John M. Restrepo and William J. Wingfield

BACKGROUND

  Printed Circuit Board (CPB) area is at a premi- urn in today's competitive size and cost driven wire- less markets. In addition to size, time to market plays a critical role in the success of radio products. One of the design obstacles that impacts both the size and time is proper shielding. Shielding is one of the most difftcult and time consuming issues in radio product development. This invention allows for more effective use of PCB space to be utilized in component layouts by reducing the area used by sol- der down shields thus resulting in smaller radio products.

  This invention also has the potential to reduce product development cycle time in regards to shield tooling lead time and development engineering investigation on the necessity of shielding of specif- ic circuits. The manufacturing cycle time may also be improved since a fewer number of placements will be required.

PROBLEM DESCRIPTION

  In the case of radio products, shielding is a very important aspect of net radio performance. Radio Frequency RF subsystems are very susceptible to noise emanating from other RF subsections and

digital sections. Shielding is the primary means of reducing the effects of noise on circuitry. In addi- tion, these shields aid in keeping the case radiation levels acceptable for FCC type approval and the pre- vention of receiver desense due to Electra-Magnetic Interference (EMT). However, these shields take up PCB area and thus are a factor in gating the size of the radio product. Due to the tooling lead time asso- ciated with shield design and the rather unpre- dictable nature of the potential circuit interactions and case radiation which affect EMI and FCC type approval, shielding is designed in at the inception of a design program, and is assumed to be necessary.

   This invention allows for a far greater degree of flexibility in shielding options by designing one set of tooling up front and then inserting shielding only as needed. The option of shielding only as needed then translates to reduced manufacturing cycle time, as only the necessary placements are made.

SOLUTION

  The invention is essentially a large shield, the Main Slotted Shield, with several slots cut into the top of it for a Slot Wall Insert. This insert is placed after the Main Slotted Shield is placed. See Figure 1 on next page.

0 Mol.amla, 1°C. 1999 56 September 1999

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Page 2 of 8

Developments Technical 0 M MOTOROLA

Slot Wall )

Insert ---- -----

Shield

Fig. 1 Main Slotted Shield and Insert

0 Motomla, Inc. ,999 57 September 1999

[This page contains 14 pictures or other non-text objects]

Page 3 of 8

Developments Technical 0 M MOTOROLA

  The PCB area savings are as a result of using track for soldering purposes and 20 mil distances the Slotted Insert Shielding method. The...