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In this paper, a wideband filtering power divider is designed by employing a stub-loaded ring resonator. The first two resonant modes of the ring resonator are excited to form the filtering passband. To improve the passband skirt, two transmission zeros near the passband are then introduced by mounting an open stub along the ring resonator. After installing two coupled lines at two output ports, one...
In this letter, a class of stopband-expanded low-pass filters (LPFs) is proposed via attenuation poles of microstrip coupled-line hairpin unit. By centrally tap-connecting this coupled-line unit and adjusting its coupling strength, three attenuation poles can be excited above the desired low passband. A coupled-line-oriented closed-form model is then constructed to provide a physical insight into...
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