The implementation and characteristics of a compact lumped-element three-order low pass filter are presented in this paper. The filter with 120 MHz cut off frequency,as well as more than 20 dB of the attenuation above 360 MHz frequency band is successfully manu- factured in an LTCC substrate with 40 μm layer thickness. The overall size of the filter is 2.0 mm×1.2 mm×0.9 mm. A good coincidence between the measured results and the full-wave electromagnetic designed responses is observed.
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