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Transmission Line Selection by Impedance Switching

IP.com Disclosure Number: IPCOM000089886D
Original Publication Date: 1968-Dec-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Audretsch, LM: AUTHOR

Abstract

An anisotropic film can be used to switch drivers to a transmission line so as to prevent discontinuity. The anisotropic film switches the impedance of stub lines 10, drawing C, in a region 12 right at its junction with the main bus 14. The impedance ZSW of the region 12 is switched by changing the magnitude of an external or magnetic field applied to a highly oriented and isotropic region which loads the transmission line. The impedance ZSW is a nominal 50 ohms when the particular stub is used for transmitting a pulse from its driver 16 onto main bus 14. However, when the stub is not being used to transmit signals from the drivers to the main bus, the anisotropic film is switched to provide a high impedance at the point in loading the bus. Region 12 is shown in drawing A.

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Transmission Line Selection by Impedance Switching

An anisotropic film can be used to switch drivers to a transmission line so as to prevent discontinuity. The anisotropic film switches the impedance of stub lines 10, drawing C, in a region 12 right at its junction with the main bus 14. The impedance ZSW of the region 12 is switched by changing the magnitude of an external or magnetic field applied to a highly oriented and isotropic region which loads the transmission line. The impedance ZSW is a nominal 50 ohms when the particular stub is used for transmitting a pulse from its driver 16 onto main bus
14. However, when the stub is not being used to transmit signals from the drivers to the main bus, the anisotropic film is switched to provide a high impedance at the point in loading the bus. Region 12 is shown in drawing A. A typical cross-section of the line is shown in drawing E. The impedance is switched by a biasing or gating current which produces a magnetic field of appropriate orientation and magnitude to switch NiFe strip 18 of oriented anisotropic magnetic material from its mu(SW) approx. 1 state to its mu(SW) approx. 10/5/ state.

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