A novel coplanar-type compact lowpass filter is proposed. It consists of an asymmetrical microstrip step discontinuity circuit with harmonic suppression and a low-impedance transmission line loaded with a capacitance. For miniaturisation, each line is connected at 90° from each other. The proposed lowpass filter is shown to suppress the harmonic by more than 15 dB compared with conventional designs.
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Kim et al. (2005) studied this question.
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