微帶環(huán)形諧振腔雙模帶通濾波器的研究.pdf

1、南京郵電大學碩士學位論文微帶環(huán)形諧振腔雙模帶通濾波器的研究姓名：吳麗紅申請學位級別：碩士專業(yè)：電磁場與微波技術指導教師：程崇虎20060401AbstractWiththerapiddevelopmentofwirelesscommunications，microstripfilters，whichhavefoundwideapplicationsinmanysystems，playimportantrolesintheRF／micro

2、wavecircuitsSothereisurgentneedforhighperformance，smallsizeandlowcostfilterstoensurelessexpensive，moreefficientandqualitywirelesscommunicationsystems，Tosatisfythesechallengingdemandsdualmodefiltersprovideanattractivesolu

3、tionDualmodefiltersareanewandexcitingtechnologyinthemicrowavefilterindustrybecauseeachofthedualmoderesonatol篙canbeusedasadoublytunedresonantcircuitand，therefore，thenumberoftheresonatorsrequiredforagivendegreefilterisredu

4、cedbyhalfresultinginacompactfilterconfiguration。Themainthesisobjectiveistodesignandfabricateband—passfilterswithsmallsizeandlowinsertionlOSSThemaincontentsarelistedaSbelow：Comparedwiththelinebasedresonators，microstdptria

5、ngularpatchresonatorshavetheadvantagesoflowconductorloss，hi醣powercapacity，compactsizeandsimplecouplingtopologyinacascadedformThedegeneratemodesCaBresultfromtherotationandsuperpositionofafundamentalmodeThemodesplittingisa

6、chievedbyintroducinganovelperturbationalongthesymmetricaxisoftheequilateraltriangularpatchresonatorTheapplicationofthisnewtypeofdual—modemicrostrippatchresonatorinthedesignofbandpassfilterispresented。Simulatedresultsshow

7、thattheinsertionlossinthepassbandhasnotbeenimprovedmuchButthesecondorderharmonichasbeeneffectivelysuppressedAnovelband—passfilterusing8dualwmodecircularringresonatorwithcoplanarwaveguide(CPW)feedlinesisalsopresentedinthi

8、sthesisInthefilteLaconventionalcircularringisusedaStheresonatorandallimpedancestepisintroducedas8formofperturbationtosplititsdegeneratemodesandtocauseacouplingbetweenthemTheSO—calledsteppedimpedanceringresonator(sl戳andth