A compact microstrip low-pass filter with ultra wide stopband using compact microstrip resonant cells

In this paper, a novel compact microstrip low-pass filter (LPF) with ultra wide stop band and sharp roll off, is proposed. In the proposed structure, a high impedance transmission line is loaded by compact microstrip resonant cells, which results in ultra wide stopband. The -3 dB cut-off frequency of filter is 1.5 GHz and the maximum insertion loss is < 0.1 dB in the passband. The proposed LPF presents extremely wide stopband from 1.68 to 44 GHz, with more than the -20 dB attenuation level, which suppresses the 2nd to 29th harmonics with high rejection levels. The size of the proposed LPF is only 0.1 lambda g x 0.19 lambda g, which shows excellent size reduction. There is a good agreement between the simulated and measured results.