Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1817989 | Physica C: Superconductivity and its Applications | 2013 | 5 Pages |
•A novel coupling scheme is used to introduce two transmission zeros using only three resonators.•The filter has a low insertion loss at 40 K, and a wide stopband with good rejection.•The filter has compactness and high-selectivity.•The filter is a suitable candidate for on-chip integration of HTS receiver front-ends.
A compact low-complexity high-selectivity high-temperature superconducting (HTS) microstrip bandpass filter is presented in this paper, which consists of only three half-wavelength resonators. A novel coupling scheme is used to provide a pair of transmission zeros outside the passband, so that the selectivity of the filter is improved. The filter is fabricated on an MgO substrate with YBa2Cu3O7−x (YBCO) coating. Measurement result shows an in-band insertion loss at 0.5 dB, a sharp slope, and a stopband rejection better than 20 dB. The compactness and high-selectivity features make the filter suitable for on-chip integration of HTS receiver front-ends.