Tables for Cascaded Homogeneous Quarter-Wave Transformers

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1、1959Young:TablesforCascadedHomogeneousQuarter-WaveTransformers233changesintheshapesofthephaseshiftercharacter-ofacontrolsignaldeterminesthesephasesettings.Theistics.Amoresuitableferriteorgeometryshouldalsorangeofcontrolfrequenciesrequiredcanbevariedtoreducethiserr

2、or.suitthedispersivecharacteristicsoftheferriteandtheTheeffectofservoerrorsignalinthesemeasurementsstabilityofthecontrolsignalsources.Whenthedutyisnegligible:thegainofthesystemissufficienttoinsurecycleofthesignalwhosephaseisbeingshiftedislargeerrorsofonly2or3degre

3、es.enough,aheterodynemethodcanbeapplied,Inthiscase,thedispersiveeffectsareeliminatedasapossibleCONCLTJSIONsourceoferror,PreliminaryexperimentaldataconfirmsAcontrolloophasbeenplacedaroundaferritephasetheexpectedperformancecharacteristic:;ofthephaseshiftertopermitpr

4、ecisephasesettings,Thefrequencycontrolsystem.Tablesfo~CascadedHomogeneousQuarter~WaveTransformers*LEOYOUNG~Sunmzary-Quarter-wavetransformersarefrequentlyrequiredinmicrowaveandUHFsystems.Anexactdesignprocedureisknownl-L+++------butinvolveslengthycalculations.Facedw

5、iththedesignofmanysuch*transformers,thecalculationswereprogrammedonanIBM704digitalcomputer.Thespeedofcomputationissuchthatseveralhundreddesignsfor2,3,and4sectiontransformersweresystemati-1=1~2=3---------Rcallycomputedinafewminutes.Theresultsarereproducedhereintabl

6、es,whichshouldpermitthecalculationofmostcasesofpracticalFig.l—Quarter-wavesteppedtransformer.interestbyinterpolation.INTRODUCTIONICROWAVEandUHFsystemsfrequentlyre-quiretransformersectionstoconnecttransmis-Msionlinesofdifferentcharacteristicimpedances‘SWR’U--*withm

7、inimumreflection.Themultisectionquarter-Fig.2—Typicalresponsecurve,wavetransformerservesthispurposewell,butitisonlycomparativelyrecentlythatexactdesignproceduresandRiblet,3andwereexperimentallyverified.Asthehavebeenpublished.Thesearelimitedtohomogeneouscomputation

8、saresomewhattedious,theywerepro-transformers,suchascoaxiallineorE-planewaveguidegrammedonanIBMType704electronicdigitalcom-transformers.puterfortransform