CAJ | 학술논문

采用并行时域有限差分（FDTD）和基于物理绕射理论（PTD）的时域等效边缘电流（EEC）的混合方法（PTDEEC），分析单反射面天线的边缘绕射场，并将该场与并行 FDTD 和并行时域物理光学（TDPO）混合方法计算得到的物理光学场相结合，实现单反射面天线远区瞬态响应的并行 FDTD 并行 TDPO/时域 PTDEEC 混合方法的模拟。偶极子馈源算例的计算结果表明：本文方法所得结果与 FDTD 方法的计算结果符合较好；单反射面天线口径边缘的绕射对反射面天线远轴副瓣区场的影响比较大。本文方法可用于任意馈源馈电的大型单反射面天线远区辐射瞬态响应的计算。
채용병행시역유한차분（FDTD）화기우물리요사이론（PTD）적시역등효변연전류（EEC）적혼합방법（PTDEEC），분석단반사면천선적변연요사장，병장해장여병행 FDTD 화병행시역물리광학（TDPO）혼합방법계산득도적물리광학장상결합，실현단반사면천선원구순태향응적병행 FDTD 병행 TDPO/시역 PTDEEC 혼합방법적모의。우겁자궤원산례적계산결과표명：본문방법소득결과여 FDTD 방법적계산결과부합교호；단반사면천선구경변연적요사대반사면천선원축부판구장적영향비교대。본문방법가용우임의궤원궤전적대형단반사면천선원구복사순태향응적계산。
The fringe wave components of a single reflector's radiation fields are obtained by using a hybrid method of parallel finite-difference time-domain(FDTD) and time-domain equivalent edge current(EEC) based on the concept of physical theory of diffraction(PTD). The time-domain total radiation fields of the single reflector are combined with those fringe wave components and the physical optical components obtained by the hybrid method of par-allel FDTD and parallel time-domain physical optics(TDPO).The far-fields of a paraboloi-dal reflector antenna illuminated by a dipole source at the focus are calculated by the hybrid method.The results are in good agreement with those obtained by FDTD method.In addi-tion,It is observed that the electromagnetic wave diffraction from the edge of the reflector's aperture has a great influence on the off-axis minor lobes of the radiation fields.The proposed algorithm is also suitable for analyzing the time-domain far-fields of various large single re-flector antennas with various feeds,including offset feed antennas.