壁滤波是彩色血流成像系统中一项非常重要的技术，但是任何壁滤波器都会对血流参数的估计引入偏差。
Wall filtering is a very important technique in color flow imaging systems. Unfortunately, wall filter usually induces a bias to the estimation of blood parameters.
本文分析了SOI脊波导的单模条件，结合SOI波导模型提出了内嵌圆式正八边形谐振腔的回音壁模式滤波器。
The single-mode conditions of the SOI-based rib waveguide is first analyzed, and applied to the whispering gallery modes embedded circular octagonal resonator filter.
基于传输线理论和波导裂缝有源阻抗提取方法，提出了一种脊波导漏壁式滤波器的简化算法。
Based on transmission line theory and extraction method of active impedance of waveguide slot, a simplified computation method for the leaky-wall ridge waveguide filter is presented in this paper.
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