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A transfer-function-adaptive quasi-elliptic-type microwave bandpass filter is presented. The devised fully-reconfigurable filter is based on a resonator-cascade structure with static impedance inverters and only exploits the tuning of its resonating nodes to achieve all its reconfiguration properties. They include center-frequency, bandwidth, and transmission-zero (TZ) control for bandpass-type responses,...
This paper addresses the application of stub-loaded planar circuits to the realization of dual-band bandpass filters and extended-upper-stopband broad-band bandpass filters with quasi-elliptic transfer function. To this aim, different classes of homogeneous- and stepped-impedance parallel-type open-ended stubs are exploited. Analytical design formulas for the transmission zeros (TZs) generated by...
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