Design of Compact HTS Dual-Band Bandpass Filters Using Dual-Function Feeding Structure With Wide Stop-Band Response

作者：Sekiya Naoto^*

来源：IEEE Transactions on Applied Superconductivity, 2017, 27(1): 1501104.

DOI：10.1109/TASC.2016.2642793

• Dual-band band-pass filter (DBPF)
• high-temperature superconductor (HTS) filter
• stub-loaded resonator
• quarter wavelength resonator
• stepped-impedance resonator (SIR)

We have developed a compact high-temperature superconducting four-pole dual-band bandpass filter (DBPF) using a dual-function feeding structure with a wide stop-band response. Use of shorted stub-loaded hairpin resonators enabled its achievement. The coupling coefficients are flexibly controlled by using a pair of H-shaped coupling elements between the resonators. A dual-function feeding structure is newly developed for flexibly adjusting the external coupling for the two bands. A tapped-line coupling is used to adjust the external coupling for the first band, and a coupled-line coupling is used to adjust the external coupling for the second one. The DBPF was designed to operate at 0.8 GHz with a 16-MHz (2%) bandwidth for the first band and at 2.0 GHz with a 40-MHz (2%) bandwidth for the second band. A compact (30 mm x 28.25 mm) filter was fabricated using YBa(2)Cu(3)Oy thin film on a CeO2-buffered Al2O3 substrate. The measured results agree well with the simulated ones.

• 出版日期2017-1