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Load Coil for RF Coupling

IP.com Disclosure Number: IPCOM000089962D
Original Publication Date: 1968-Dec-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 61K

Publishing Venue

IBM

Related People

Boerger, FE: AUTHOR [+3]

Abstract

This RF heating coil is for the induction heating of various articles in suitable furnaces, as for example, for heat treating of metal parts. Coil 1 is constructed such that the contour of its lower portion of 1A is that of bed plate 2 which is made of refractory material. Workpieces 3, placed on plate 2, are situated in coil 1 to such an extent that end effects of such coil are minimized. Workpieces 3, disposed on plate 2, are heated uniformly across their extent as a result of their proximity to portion 1A. Coil 1 is constructed of multifilar windings. Such windings produce more current path and hence more field per coil separation. Attached to portion 1A is a shorting flat 1B which serves to shape the electromagnetic field in a contour similar in shape to that of workpiece 3.

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Load Coil for RF Coupling

This RF heating coil is for the induction heating of various articles in suitable furnaces, as for example, for heat treating of metal parts. Coil 1 is constructed such that the contour of its lower portion of 1A is that of bed plate 2 which is made of refractory material. Workpieces 3, placed on plate 2, are situated in coil 1 to such an extent that end effects of such coil are minimized. Workpieces 3, disposed on plate 2, are heated uniformly across their extent as a result of their proximity to portion 1A. Coil 1 is constructed of multifilar windings. Such windings produce more current path and hence more field per coil separation. Attached to portion 1A is a shorting flat 1B which serves to shape the electromagnetic field in a contour similar in shape to that of workpiece 3. This shorting link shapes the RF field for optimum uniform coupling of RF energy into a workpiece 3 and provides for better temperature uniformity across such workpiece.

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