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1、312IRETRAMSACTIONSOh:AXTEXNASANDPR.0Pz4GATIONods,especiallyintheVHFregion.Moreover,thegreatDemonstrationofFormulas(8)and(9)variationsoftheconstantswithfrequency,contrarytoWehavefromordinarytransmissionlinetheorythecommonlyaccepted“fact”thattheyshouldbepracti-c
2、allyconstant,justifythesomewhatextensivediscus-”LOsionoftheresultsobtained.Inthisdiscussionitisseenz1=Z&)=~tanhylthat,althoughtheconstantsvarygreatlywithfre-quency,thegeneralbehaviorofsoilasareflectinglayerzozz=Z,,(21)=~forradiopropagationcomparesqualitatively
3、wellwithtanh2yltheothermethodscited.Thoughlocalvariationsofthesoilmaybeoflessim-Z2tanhVI1__-=_-(1+tanh2yl),portanceinradiopropagation,wheretheaveragesoilZ1tanh2712conditionoveralargeareashouldbetaken,thepresentmethodmayproveusefulasameansforinvestigatingwhichr
4、esultsingeneralphysicalpropertiesofsoilandgeologicalsur-facephenomenathroughtheirrelationtothemeasuredelectriccharacteristics,and,inthissense,theknowledgeoflocalvariationsofsoilcanbeofimportance.andsubsequentlyAPPENDIXZa=Z1.tanhyE=dZ1(222-Z,).DemonstrationofFo
5、rmula(5)FromelementaryelectromagnetictheorywehaveACKXOWLEDGMENTGC-=-.Theauthorwishestothanktheauthoritiesoftheue“LaboratoriodeElectronicaydeCommunicaciones”(ArgentineArmedForcesResearchLaboratory)forHence,theirencouragementinthepresentwork.HealsowishesEGE‘GG8.
6、85*GmhotoacknowledgethestimulusandhelpfulsuggestionsofLuisP.Poli.TheArchimedeanTwo-WireSpiralAntenna*JULIUSA.KAISER?Summary-ApairofequallyexcitedbutoppositelysensedINTRODUCTIONArchimedeantwo-wirespiralssituatedclosetooneanotherinthesameplane-adoublet-isusedtog
7、eneratealinearlypolarizedfieldHEtwo-wireArchimedeanspiralconfigurationsinwhichthedirectionofpolarizationandphasearecontrolledorshowninFig.1,whenproperlyexcited,havebeenvariedindependentlyofeachotherbyrotationofthespiralradiators.showntobecircularlypolarizedrad
8、iatorswithAnarrayofthesedoubletscanbemadetoscanbyrotationofthebroadbandcharacteristic-broadbandwithrespectnotseveralspiralelements;aneight-doubletarraywhichwasmadetoonlytoinputimpe
