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Emergency cellular RF link for metal elevators

IP.com Disclosure Number: IPCOM000008505D
Original Publication Date: 2002-Jun-18
Included in the Prior Art Database: 2002-Jun-18
Document File: 6 page(s) / 68K

Publishing Venue

Motorola

Related People

Authors:
Gadi Shirazi Yerach Krupnik

Abstract

This paper is about enabling a cellular communication in elevators. Since elevator is usually build as a big metal box, it forms a "Faraday electromagnetic cage" in which electromagnetic radiation can not penetrate. Therefore loosing the cellular connection in an elevator is a common phenomenon. Usually, this is not an important problem, but when a miss-function of the elevator occurs, a real problem arises. The situation where a person is trapped in a stuck elevator is well known and very unpleasant. Nowadays, when a cellular telephone is very common, it would be very convenient and sometimes crucially important to allow the use of a cellular telephone inside a stuck elevator in order to call for rescue.