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An Integrated Planar LC LPF(Low-Pass Filter) is designed and fabricated with Modified Surface Micromachining. The LPF is accomplished on low-resistance silicon substrate. To increase the performance of the filter, the substrate underneath the devices is modified with OPS (oxided porous silicon) technology. Measurement results give -3dB bandwidth of 2.925GHz and midband insertion loss of 0.874dB at 500MHz.