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A novel lowpass filter (LPF) with a sharp roll-off and a wide stopband is presented. The proposed LPF is based on a dual-plane structure with an interdigital shape defected ground structure (DGS). The DGS exhibits a sharp roll-off and three transmission zeros. By tuning the length of the fingers, the resonant frequency can be easily changed. Based on the proposed DGS, a LPF has been designed, fabricated...
A compact microstrip tri-band lowpass-bandpass filter is described. Two different sets of λ/4 uniform-impedance open stubs generate the desired transmission zeros (TZs) to divide a lowpass frequency response based on a radial stub loaded high-impedance microstrip line into a tri-band lowpass-bandpass frequency response. A lowpass passband with a 3 dB cutoff frequency of 0.66 GHz, and two bandpass...
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