Defected ground structure (DGS) is a nonperiodic structure proposed in recent years, which means machining various shapes of etching on the ground plane.
即缺陷接地结构,它是近年来提出的一种在微波平面电路接地版上刻蚀出非周期形状的结构。
The window Fourier transform(WFT )is one solution to the problem of better representing the nonperiodic signal.
窗口傅里叶变换能够更好的解决关于非周期信号的表示问题。
Two models of 2d photonic crystal of line defects and nonperiodic dielectric rods are established. The finite-difference-time-domain method is developed for the study of bandgap.
We discuss the nonperiodic abnormal stripe noise due to the spaceborne SAR system itself, and present an area filtering method in two-dimensional frequency domain.