Abstract
Microstrip filter structures for 900 MHz and 2 GHz wireless communications are presented. The issue of the compactness of the filter layout using YBa2Cu3O7 (YBCO) high-temperature superconducting (HTS) thin films with limited wafer size is addressed. Compact forward-coupled filters with up to nine poles on 50-mm-diameter wafers, and 19 poles on 75-mm-diameter wafers were realized at 900 MHz. Microstrip lumped-element HTS filters are also presented. Ultra-narrowband microstrip filters with 0.27% bandwidth were demonstrated using a novel frequency-transformation design technique. Power-handling issues for HTS applications are discussed and filters with over 30-W power-handling capability are presented.
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