The (frequency) converter (adopted) multilevel technology with cells series, which could obtain stepped SPWM waveforms, and could drive ordinary motor directly with no output filter.
该变频器采用单元串联多电平技术，可以得到阶梯SPWM波形，无需输出滤波器，可直接驱动普通电动机。
This paper presents a novel synthesis method of dual-band bandpass filter composed of both defected stepped impedance resonator DSER.
该文提出一种混合采用微带阶梯阻抗谐振器和缺陷阶梯阻抗谐振器的新型双通带滤波器设计方法。
This filter is composed of three stepped-impedance resonators(SIRs), and can decrease the length of resonator effectively.
该滤波器采用阶跃阻抗谐振器（SIR）作为谐振单元，可以有效缩短谐振器长度。
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