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Omnidirectional and multiple-channeled high-quality filters of photonic heterostructures containing single-negative

Yuanjiang Xiang1, Xiaoyu Dai, Shuangchun Wen

  • 1Research Center of Laser Science and Engineering and School of Computer and Communication, Hunan University, Changsha 410082, China.

Journal of the Optical Society of America. A, Optics, Image Science, and Vision
|October 4, 2007
PubMed

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Active filters are electronic circuits that use operational amplifiers (op-amps), resistors, and capacitors to filter out unwanted frequency components from a signal. A first-order low-pass active filter is designed to pass signals with a frequency lower than a certain cutoff frequency and attenuate frequencies higher than that cutoff frequency. The transfer function for a first-order low-pass active filter is: