角馈背腔缝隙双极化天线特性分析

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1、AbstractInsuchcase，theextendinglengthofthefeedlinesandthestripsovertheslothasthelargestinfluenceontheantennacharacteristicsduetotheirimmediateimpacttotheimpedancematching．However，themostunbearableisthattheresonantperformanceisverysensitivetothelengthoffeedlinesandstrips，wh

2、ichareusuallytooshort．Thentheaccuracyrequirementoftheantennamanufactureisverysevere．Tosolvethisproblemthecomer-fedantennaisproposed．(2)Thecomer-fedantennameanthefeedmicrostripsandtheloadedstripsarelocatedonthediagonallinesofthecavityrectangularsurface．Becausethedistancebet

3、weenthecomerandtheslothasthelargestvalue，thefeedlinesalsohavethelargestlengthandthefeedportimpactontheantennaresonantperformancecanbereduced．However，iftheloadedstripsaregroundedinsuchcase，thebetterisolationfrequencypositionswillbefarlowerthantheoperatingband，whichhasthesam

4、evariationtrendastheedgefeed’S．Thereasonforitisthatthecomer-fedlinewouldpresentlargerinductancevaluejustbyitself．Soforthecomer-fedcasetheloadedstripsshouldnotbegroundedandbythiswaythebeaerisolationbandpositioncanbethesamewiththeoperatingbandandthegoodportsisolationisobtain

5、ed．Duetothelargefeedlinelengththeponshavelittleinfluenceontheantennaresonanceandtheantennamanufacturegetsmorefeasibility,thoughtheextendingsectorovertheslotforfeedlinesandstripsstillarethemajorfactortodecidetheimpedancematching．Threetypesofantenna，whichallareoftherectangul

6、arcavity,areproposedtoverifytheaboveanalysisresults．Thedifferencebetweenthemisthattheirradiationslotsareannular,rectangularannular,andrectangularannularof45-degreerotaryangle，respectively．Theresultsshowthattheantennasofannular,ordislocatedrectangularannular,havebetterperfo

7、rmance．Infact，thehighisolationforthecomer-fedantennaCanalsobeexplainedbythelargerspacingbetweentwopoIrts，whichhasbeenverifiedbythesquarepatchantennaofdual-polarizedradiation．(3)Withthehelpoftheaboveanalysis，itCanbeconcludedthattheloadedstripsCaneffectivelymodifythebetteris

8、olationbandposition，whiletheyhavelittleaffectiononthatoftheoperatingband．Theotherexplanat