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王均宏,简水生(,100044):Floquet,,,,:;;;;:TN813TN8226:A:1000-436X(2000)12-0017-06Analysisoftheradiationmodeoftheleakycoaxialcableandtherestraintofthehigh-ordermodeWANGJun-hong,JIANShu-isheng(InstituteofLightWaveTechnology,NorthernJiaotongUniversity,Beijing100044,China)Abstract:StartingfromtheFloquettheorem,theradiationmodeoftheLeakyCoaxialCableisanalyzedinthispaper,theexistingconditionoftheradiationmodeisgiven,andthefrequencybandwidthofthemono-moderad-iationisdiscussedThen,therestraintmethodofthehigh-ordermodeisstudiedforextendingthemono-modera-diationbandwidth,andthemeanshowtorealizedittotheconfigurationoftheleakycoaxialcablearedis-cussedThetheoryofthispaperisthebasisofthedesignoftheslotarrayconfigurationoftheleakycoaxialcablewhentherequestedfrequencybandwidthisgivenKeywords:leakycoaxialcable;radiationmode;spatialharmonic;frequencybandwidth;high-ordermodere-straint1[1],[2],,[3~5],,[6],,,:1999-04-27;:2000-07-31:(69601008,60071012)2000122112JOURNALOFCHINAINSTITUTEOFCOMMUNICATIONSVol.21No.12December2000,,[7,8],,,,,()2,1,,()^uE,E1E(r,,z)=R(,r,)Z(z)e-jz0z(1)z0=k0re,,k0,reejtR(,r,)r,,R(,r,)=n=-Fn[Jn(r),H(2)n(r)]Gn()(2)Fn,R(,r,),(2)Jn(r)H(2)n(r),(2)H(2)n(r),;,(2)Jn(r)H(2)n(r)(2)Gn(),n,Floquet:,,,,,(1)Z(z)z,Z(z)=m=-Zme-j2mpz(3)m;p,1(1)E(r,,z)=m=-ZmR(m,r,)e-jzmz(4)zm=z0+2mp(5)182000,,,,,(2),2m0,(2)R(m,r,)=n=-Fn[In(mr),Kn(mr)]Gn(),m=-2m(6)In(mr)Kn(mr),,2m0,,,k20=2zm+2m(7),(5)2m0k0=2fc-mf1f-mf2(8)f1=cp(re+1),f2=cp(re-1),cm0,(8),m0m-1(8)22,ff1,ff1,-1,-1,3-1()m=-13-1m=cos-1(re+mP)(9),cosm=zmk01912:(9),f=f1,-1=180,-1,f2-1=0,-1,,2f1,-2,,4,3f1,-3,,-1INT[(re+1)(re-1)]re=125(,,125),17,(9)4-1-2,,[f1,2f1],21,,(8),-1,(re+1)(re-1),,,,re,[9],90,,,,,[10],[11],-1125,,3,,-1-1,[9],m,p-m-1,5ZZ1(z),(3);Z2(z),5202000Z2(z)=m=-Zme-j2mpz(10)Z(z),Floquetz=z-p-m-1Z(z)=m=-Zm(1+ej2mpp-m-1)e-j2mpz(11)(1)E(r,,z)=m=-Zm(1+ej2mpp-m-1)R(m,r,)e-jzmz(12),1+ej2mpp-m-1,mp-m-1=-p2m,m-2(13)m=-2,p1=p4,p4,-2-3,p2=p6,4,6,,,,,E,Z(z)Z(z),,(),6(a)Z(z)EZ(z)=m=-Zm(1-ejm)e-j2mpz(14)E(r,,z)=m=-Zm(1-ejm)R(m,r,)e-jzmz(15)6,m,,,-3-5,31p6,6(b),-3,512112:5,[12],,,:[1]BEALJC,JOSIAKJ,MAHMOUDSF,etalContinuous-accessguidedcommunication(CAGC)forground-transportationsystems[J].PIEEE,1973,61(5):562-568[2]RadiatingcoaxialcableaidsRFcommunications[J]AustralianElectronicsEngineering,1990,23(6):30,32[3]HAAGHG,THONNSSENGLeakycoaxialcablesformobilecommunication[A]Proceedingsof38thInternationalWireandCableSymposium[C]1989,286-294[4]HAAGHC,LEHANKLeakycoaxialcablesystemsforhighspeedtrainsintunnelsandortherenvironmentalconditions-theoryandex-perience[A]Proceedingsof39thInternationalWireandCableSymposium[C]1990,71-79[5]RAMPALLIS,NUDDHRRecentadvancesinthedesignsofradiating(leaky)coaxialcables[A]Proceedingsof40thInternationalWireandCableSymposium[C]1991,66-77[6]DELOGNEPP,LALOUXAATheoryoftheslottedcoaxialcable[J]IEEETransonMTT,1980,28(10):1102-1107[7],[J],1996,18(6):18-24[8]WANGJH,JIANSSAnalysisofthefielddistributionstimulatedontheoutconductorslotoftheleakycoaxialcables[A]Proceedingsofthe1997IEEEInternationalSymposiumonAP-S[C]Montreal,Canada,2095-2098[9]()SakabeIVHF-UHF[J].,1995,6:41-45.[10],[M].:,1994,173[11][M].:,1984,14[12][R],1996,10222000