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1、?L# 李高升,刘继斌,何建国 (SS/v0S,2410073)K1:面向工程应用的实际,分析了引起抛物面天线偏焦的原因,较为详细地推导了各种情况下允许的馈源最大偏焦距离,得出了简洁的表达式,并对所得结果的物理意义进行了简要分析,这对于指导工程实践有着重要的现实意义。文章最后给出了关于偏焦的各种应用场合的介绍。1oM:抛物面天线;偏焦;馈源ms|:TN957.2DSM:AcI|:1009-0401(2004)03-0038-04Study ontheory andapplicationoffocus excursionofparaboloidfeedsourceLI Gao-sheng, LI
2、UJi-bin, HEJian-guo(TheSchoolof ElectronicScience andEngineering, NationalUniversityofDefenseTechnology, Changsha 410073, China)Abstract:Aiming at engineering application, this paper analyzes possiblecausesof focus excursionin theparaboloidantenna, deduces allowedmaximal distance of focus excursionu
3、nder various conditions inde-tails.Compactexpressionsareachievedintheend.Andthephysicalsignificationoftheresultsisofferedinbrief description.Thishasparticularimportanceintheguidanceofengineeringpractice.Finally, introduc-tionof occasionwhere thefocus excursioncanbeusedaregiven.Key words:paraboloidan
4、tenna ;focusexcursion;feedsource1引言rdY5f?Z,Q?L41p。9Sis?L?Y,BM。M,|CC,9v,iPg3M,?L9mg。&VBt+y?,F,V+L=p。y1:(1)&AM;(2)M,M;(3)l?P?L,=V?H;(4)LC+7#iP。?L5,S/d2,|=f +x = 2f1+cosT(9),V:=2 y2(cos)24f (1+cos)+ysinmax =2 y2(cos0)24f (1+cos0)+ysin0(11)2ysin=2y(-33!+)2(yf y -y6f3 y3)yN,_HgMMvLpMMZpMM。yfFO,#LVUQ)oQLZ
5、_B。ZpMMMh,V7ho,iC。7max8 ,5Kv_ymax =2f18f(cos0)2(1+cos0)+sin20 -sin0(cos0)2(1+(cos0)2)(12)2.3 iZ_iZ_,M_:_,m3U。-s,FVGrg;vVArg;。图3馈源的任意方向偏焦d =FG +GJ = cos+ x2 +y2cos +f +x0 -cos40rF2004M3= 1cos( x2 +y2 +f +x0) (13)sin x2+y2cos#1cos1+12(x2+y2)(cos)22d =d -(f +x0)=(f +x0)(x2 +y2)(cos)222+ x2 +y2sin (14)m
6、ax =2(x2 +y2)(cos0)24f (1+cos0)+ x2 +y2sin0 (15)V7x2 +y2max =2f18f(cos0)2(1 +cos0)+sin20 -sin0(cos0)2(1+(cos0)2)(16)3馈源偏焦的应用_:_|gM。_vH,gMLM,LKv_,Z_m+M;:_gM,yNZ_m9;:_vH,Z_moMz。,rB?LVYT6,vjHT,H67 。L=H1?Lo_T/P,PoLT,9PolS=,r。.,PX,.?LM .:SS/v,1989.4 .ElJ .lj/, 1997(1).5 RUZE J.Lateral Displacement ina paraboloid J .IEEETrans.onAP,1965(13).6 .o?L!95J .o,2001,17(3).7 .?LoM .:0S/v, 1994.416?L#
