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In this work the design of a microstrip line based frequency agile bandpass filter with improved selectivity is presented. The original combline bandpass performance is improved, by a transmission zero which is inserted in the lower stopband, resulting in steeper stopband transitions. The frequency agile behavior is obtained by using ferroelectric thin-film varactors as tuning elements at the resonator...
A new concept for tunable and reduced size microwave circuits is presented based on barium-strontium-titanate (BST) varactors. The proposed design methodology relies on substitution of quarter-wavelength transmission line segments with their equivalent low-pass structures. The ferroelectric BST-varactors are used as tuning elements and allow for a frequency agile behavior and size reduction of the...
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