CAJ | 학술논문

环形桁架可展开天线的型面由一系列面片拼合而成，其电性能由这些面片的大小和形状决定。本文针对环形可展开天线型面周期性几何逼近误差导致天线远场方向图存在电平较高的栅瓣的问题，提出了通过破坏误差周期性来消除其对电性能影响的方法。首先，分析了型面几何逼近误差的周期性及其对天线电性能的影响；其次，提出两种消除型面几何逼近误差周期性的方法，一是在径向引入破坏因子，二是改变型面环向轮廓形状；最后，建立优化模型，求出同时满足用户电性能和结构要求的网面分环数和破坏因子。数值仿真表明本文提出的型面优化设计方法既能在保证天线增益的条件下消除栅瓣，又不导致天线结构过于复杂。
배형항가가전개천선적형면유일계렬면편병합이성，기전성능유저사면편적대소화형상결정。본문침대배형가전개천선형면주기성궤하핍근오차도치천선원장방향도존재전평교고적책판적문제，제출료통과파배오차주기성래소제기대전성능영향적방법。수선，분석료형면궤하핍근오차적주기성급기대천선전성능적영향；기차，제출량충소제형면궤하핍근오차주기성적방법，일시재경향인입파배인자，이시개변형면배향륜곽형상；최후，건립우화모형，구출동시만족용호전성능화결구요구적망면분배수화파배인자。수치방진표명본문제출적형면우화설계방법기능재보증천선증익적조건하소제책판，우불도치천선결구과우복잡。
Since curved antenna surface is approximated by flat facets ,the electromagnetic (EM) properties of an AstroMesh reflector are determined by the size and shape of the facets .A period disturbance technique is presented to decrease the grating lobe level generated by periodic geometric approximation error .At first ,the periodicity of the error and the effects of the periodicity on EM properties are studied .Secondly ,two strategies are developed to disturb the periodicity of the error ,one is to introduce radial di-rection disturbance parameters ,and the other is to change the shape of the rings .At last ,an optimization model is built to obtain few-er segments ,proper disturbance parameters and better EM performance .Numerical examples show that the presened method can e-liminate the grating lobes level without decreasing the gain and increasing the structural complexity of AstroMesh antennas .