COMPACT AND WIDEBAND 1-D MUSHROOM-LIKEEBG FILTERSS. Mahdi MoghadasiCommunicationsandComputerResearchCenterFerdowsiUniversityofMashhadMashhad,IranA. R. Attari and M. M. MirsalehiElectricalEngineeringDepartmentFerdowsiUniversityofMashhadMashhad,IranAbstract—Anewwidebandandcompactbandstopfilterusingonedimensional (1-D) mushroom-like electromagnetic bandgap (EBG)structuresisproposedinthispaper.Althoughtheproposedstructurecannotbefabricatedaseasyasdefectedgroundstructure(DGS)filters,ithasseveralwinningfeaturessuchasmorecompactness,bettercharacteristicsandnobackwardradiation. A5-cell1-Dmushroom-likeEBGfilteriscomparedwith5-celland9-cellcircularDGSfilters.The1-Dmushroom-likeEBGfilterisfoundtobemorecompactasitrequiresfewercellsforthesamecharacteristicsandalsoasithas0.44timesshortercelllength. TheproposedEBGfilterhasa10-dBbandwidthof39%whilethe5-celland9-cellDGSfiltershave10-dBbandwidthof20%and27%,respectively.Also,the1-Dmushroom-likeEBGfilterisstudiedforvariousnumberofcellsandcomparedwithatwodimensional(2-D)structure.Thesimulatedandmeasuredresultsarefoundtobeingoodagreement.1. INTRODUCTIONElectromagneticbandgap(EBG)structuresareperiodicstructuresthat prohibit the propagation of electromagnetic waves at certainfrequencies[1–3]. Becauseoftheirnovelelectromagneticproperties,EBGstructureshavebeenusedinvariousapplicationsinmicrowave,antenna,andpropagationfields[4–8]. Anarrayofmetalprotrusions
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Moghadasi et al. (2008) studied this question.
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