Browse Prior Art Database

RF Mailbox

IP.com Disclosure Number: IPCOM000006767D
Original Publication Date: 2002-Jan-30
Included in the Prior Art Database: 2002-Jan-30
Document File: 2 page(s) / 47K

Publishing Venue

Motorola

Related People

Frank Lotz: AUTHOR [+2]

Abstract

Creation of an isolated EMI/RF environment by way of a electrically conductive can lined with RF absorber material and containing RF sealing finger stock along its opening edge that travels towards and acts upon a rigid bulkhead mounted sealing ring.

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RF MAILBOX

by Frank Lotz and Robert Schneider

INTRODUCTION

The RF Mailbox was designed to provide a low cost shielded RF anechoic environment for testing personal communication devices that can be used in both manual and automated systems. 

PROBLEM TO BE SOLVED

As part of the manufacturing process of a wireless product (such as a cellular phone or pager) there is a need to test inside an EMI/RF isolated environment (RF Mailbox) to prevent unwanted electromagnetic signals from both entering into or escaping from said environment.  Further, the method by which an EMI/RF isolated environment is created should be de-coupled from any Device Under Test (DUT) fixture contained within.

SOLUTION TO PROBLEM

By moving an open ended chamber which contains an RF absorber material towards a rigid bulkhead with sealing ring and without any additional door, lid, clam or similar type feature, a separately mounted non-moving monolithic DUT fixture with rigid cabling can be EMI/RF isolated.

UNIT OPERATION

Refer to Figures 1 and 2 as follows.  A DUT is placed into a monolithic test fixture (not shown) which sits on a shelf that is cantilever mounted to the rigid bulkhead.  The chamber moves horizontally towards the rigid bulkhead such that a continuous strip of RF sealing finger stock on the chamber’s leading edge contacts the rigid bulkhead mounted sealing ring, thereby creating an EMI/RF isolated environment.  Further, the chamber contains an optional RF absorber material to reduce reflections of...