无线电工程
無線電工程
무선전공정
Radio Engineering
2015年
11期
52-55
,共4页
角分集%双波束馈源%正交模耦合器%介质杆天线
角分集%雙波束饋源%正交模耦閤器%介質桿天線
각분집%쌍파속궤원%정교모우합기%개질간천선
angular diversity%dual-beam feed%orthomode transducer%dielectric rod antenna
针对散射通信中角分集天线双喇叭馈源方式分集效果不佳的问题, 设计了一种角分集双波束馈源. 采用锥变分支与膜片分支相结合的方式, 在不增加结构复杂度的基础上改善了OMT耦合端口的驻波; 用介质杆天线代替喇叭天线,从而减小了馈源辐射口面的横向尺寸, 克服了因双馈源体积大而无法满足理想分集效果波束夹角 ( 0. 75~1倍波束宽度)要求的问题. 应用CST对双波束馈源模型进行了优化设计, 在要求的12.7%的带宽内驻波低于1.3.
針對散射通信中角分集天線雙喇叭饋源方式分集效果不佳的問題, 設計瞭一種角分集雙波束饋源. 採用錐變分支與膜片分支相結閤的方式, 在不增加結構複雜度的基礎上改善瞭OMT耦閤耑口的駐波; 用介質桿天線代替喇叭天線,從而減小瞭饋源輻射口麵的橫嚮呎吋, 剋服瞭因雙饋源體積大而無法滿足理想分集效果波束夾角 ( 0. 75~1倍波束寬度)要求的問題. 應用CST對雙波束饋源模型進行瞭優化設計, 在要求的12.7%的帶寬內駐波低于1.3.
침대산사통신중각분집천선쌍나팔궤원방식분집효과불가적문제, 설계료일충각분집쌍파속궤원. 채용추변분지여막편분지상결합적방식, 재불증가결구복잡도적기출상개선료OMT우합단구적주파; 용개질간천선대체나팔천선,종이감소료궤원복사구면적횡향척촌, 극복료인쌍궤원체적대이무법만족이상분집효과파속협각 ( 0. 75~1배파속관도)요구적문제. 응용CST대쌍파속궤원모형진행료우화설계, 재요구적12.7%적대관내주파저우1.3.
A dual-beam feed has been designed in this work,to solve the problem that a two-horn feed in angular diversity antenna system usually can not achieve the desired diversity result.The VSWR of the coupling port of OMT has been reduced by placing septum in the stepped-impedance transformation;and the size of the feed has been decreased by using rod dielectric antenna instead of horn antenna so that the feed can meet the requirement of the best squint angle(0.75~1 times of the beam width).The dual-beam feed has been designed and optimized by the CST code,the VSWR is less than 1.3 in the bandwidth of 12.7%.
