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A lossy three-pole microstrip bandpass filter using an extended doublet network is proposed in this letter. Nonuniform Q distribution is considered by reducing the of one resonator, resulting in a flatter passband with an enhanced selectivity. Also, the novel feeding network adopted brings about two extra transmission zeros and a wide stopband that further improve the filter performance. Good...
This paper reports an investigation of performance enhancement for electronically tunable microstrip filter. Based on the effects of lossy components on passband response of a bandpass filter, a new concept to improve the performance (passband flatness and selectivity) is proposed. Unlike other techniques published, this new concept results in nonuniform Q distribution by loading lumped elements to...
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