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1、ABSTRACTABSTRACTWithwideapplicationofwirelesstechnology,radiofrequencyRFengineersneedtohaveahigherlevelofdevelopmentandintegration,aswellastestandmeasurementtechnologyforthedevelopmentandproductionunderthenewstandards.Wirelesscommunicationterminaldevicesbecomehighlyintegratedandhighlytechnologica
2、llevel,theRFterminalproductswillcontinuetodevelopmentincomplexityandsize.Researchanddevelopmentengineersmustprovidesolutionswithoutsacrificingperformancewithinaverysmallvolume,inordertosupporttherapidlygrowingRFcontent.Incommunicationsystems,thedesignandmanufactureofRFdevicesarefacedwithvariousch
3、allenges,suchashighfrequency,multiplefrequencies,highperformance,lowinterference,smallvolumeandsoon.Toimprovetheperformanceofthecommunicationsystems,inhibithigherharmonicsfromexternalsignals,mixersandoscillatorsandincreasethesensitivityofthereceiver,thefiltermustmakeitscapacityofbandrejectionbebe
4、tter.Microwavefilterwithharmonicsuppressionhavebecomeoneofthehotspotsinthefieldofmicrowavetechnology.Wewritethethesisbasedontheprocessingtestandpaymoreattentiontotheactualrequirementofengineering,whichmainlystudiestheharmonicsuppressiontechnologyofcavityfiltersandstrip-linefiltersbasedontradition
5、aldesignandseekingtosuppresstheparasiticpass-band,inordertoachievehighperformancedesign.Firstly,weintroducetheresearchstatusofmicrowavefiltersindetail,emphaticallyanalyzetherelatedtransmissionlinetheorywhichconsistsofthecharacteristicsanalysisofrectangularresonantcavitiesandsuspendedstrip-line,in
6、ordertosupportthedesignprocessofthesismentionedfilters.Secondly,basedontheaforementionedtheory,wedesigntworectangularcavityfilterswithharmonicsuppression.Theformeraimstobroadenthestop-bandbythewayofchangingthewidthofeachcavityandregulatingthecouplingstructurebetweencavities,sothatthesecondresonan
7、cefrequencyofeachcavitycanshiftedfromeachother.Thelatterusessymmetriccavitystructure,weoptimizethesizeofeachcavitiesandcouplingdiaphragmsothatthecavityparasiticpass-banddeviatefrom55GHz-60GHz.Thelatterwasprocessedandte
