Browse Prior Art Database

Microwave Strip Line Modulator

IP.com Disclosure Number: IPCOM000094476D
Original Publication Date: 1965-Feb-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Bolt, MH: AUTHOR

Abstract

This circuit is formed of a conductive sheet pattern insulatingly positioned between two sheetconductive surfaces to form a wave propagating structure. Only the lower sheet 9 is shown. RF energy is applied at arm 10 and propagated along arms 11 and 12. A modulating signal applied at terminal 13 switches diodes 14 and 15 alternately. Such switching is between their conductive states in which they appear as inductors and their nonconductive states in which they appear as capacitors. These changes in the impedance of arms 16 and 17 with respect to their opposite arms modulate the RF energy and produce the carrier and the upper and lower sidebands in arms 18 and 19.

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Microwave Strip Line Modulator

This circuit is formed of a conductive sheet pattern insulatingly positioned between two sheetconductive surfaces to form a wave propagating structure. Only the lower sheet 9 is shown. RF energy is applied at arm 10 and propagated along arms 11 and 12. A modulating signal applied at terminal 13 switches diodes 14 and 15 alternately. Such switching is between their conductive states in which they appear as inductors and their nonconductive states in which they appear as capacitors. These changes in the impedance of arms 16 and 17 with respect to their opposite arms modulate the RF energy and produce the carrier and the upper and lower sidebands in arms 18 and 19.

Two lines 20 and 21 connect lines 18 and 19 to output line 22. The length of lines 19 and 21 is made an odd multiple of a half wavelength of the carrier greater than the length of lines 18 and 20. Thus, the two portions of the carrier cancel at output 22 and only the sidebands appear.

By omitting arms 20, 21 and 22, the carrier and sideband output at either an arm 18 or 19 can be used. When only one arm 18 or 19 is used as an output, the other arm is connected to a dummy load.

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