Power handling improvement by an upper conducting layer for 4GHz-band HTS microstrip-disk filters with dual-mode

We report that 4GHz-band HTS microstrip disk filter has increased the power handling capability by an upper conducting layer for dual-mode with TM11 mode disk resonator. The 4GHz, 0.1GHz-bandwidth YBCO 4-pole disk filter with an upper YBCO small disk-layer for dual-mode was fabricated. With respect to power handling examination, the input–output power measurement of the fabricated filter was carried out in the range of 50–80K. For comparison, the fabrication and power test of the YBCO 4-pole disk filter with a conventional notch for dual-mode were preformed. The measured results of the handling power showed that the filter with a upper conducting layer can handle a power of 10W, up to which the dual-mode disk filter with a notch made an RF break down.