Browse Prior Art Database

VARIABLE HEIGHT TWO-PIECE SHIELD

IP.com Disclosure Number: IPCOM000008364D
Original Publication Date: 1997-Dec-01
Included in the Prior Art Database: 2002-Jun-11
Document File: 2 page(s) / 83K

Publishing Venue

Motorola

Related People

Siggy Punzenberger: AUTHOR [+2]

Abstract

This paper describes improvements in mechanical shielding approaches providing a reduction in the number of parts used for shielding different electrical circuits respectively using one size of a two- piece mechanical shield for multiple applications.

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MOTOROLA Technical Developments

VARIABLE HEIGHT TWO-PIECE SHIELD

by Siggy Punzenberger and Fortunato La Pietra

INTRODUCTION

  This paper describes improvements in mechanical shielding approaches providing a reduction in the number of parts used for shielding different electrical circuits respectively using one size of a two- piece mechanical shield for multiple applications.

PROBLEM(S) TO BE SOLVED

  Electrical designs, especially in the radio frequency (RF) environment, often require localised shielding to prevent unwanted radiation of signals between susceptible circuits or from external influ- ences. Mechanical shields are usually formed using a one piece solid or perforated, or, if access to the circuitry is needed for testing/service/alignments, a two-piece shield design is commonly used. This two-piece shield design is normally manufactured with a bottom part ("corral") having a certain area and height dependent upon the board space requirements and height of the enclosed electrical components. The second top part is the cover which usually snaps on to the upper part of the corral. The two-piece shield design approach described above allows a common cover piece for a given shielded area surrounded by a corral. However, if different height requirements exist, the height of the corral must also be taken into account,

PROPOSED SOLUTION TO THE PROBLEM(S)

  It is often the case that one shield foot-print is suitable to enclose or isolate different areas of the circuit...