IEEE transactions on microwave theory and techniques, 2017-10, Vol.65 (10), p.3813-3823
2017
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- Autor(en) / Beteiligte
- Titel
- High-Order Dual-Band Superconducting Bandpass Filter With Controllable Bandwidths and Multitransmission Zeros
- Ist Teil von
- IEEE transactions on microwave theory and techniques, 2017-10, Vol.65 (10), p.3813-3823
- Ort / Verlag
- New York: IEEE
- Erscheinungsjahr
- 2017
- Quelle
- IEEE Xplore
- Beschreibungen/Notizen
- In this paper, a compact dual-mode hairpin ring resonator (HRR) with two controllable resonances is proposed to design high-order dual-band high-temperature superconducting (HTS) bandpass filters. Its noncoupled dual-mode resonant characteristics and the mechanism for inherent transmission zero (TZ) production are studied. Moreover, a general dual-path coupling scheme is introduced for high-order coupling realization and applied to the third-order and eighth-order dual-band filter design. Also, two coupling structures for the adjacent HRRs with different orientations are proposed to excite TZs between the passbands for high selectivity. Besides, dual-parallel input-output feeding structure is adopted to tune the external quality factors of the dual-mode HRR individually so that the two passband are realized easily using high-order structure. For demonstration, an eighth-order dual-band HTS filter both operating at 1.9 and 2.6 GHz for mobile communications application are designed and analyzed. Compared with the third-order one, the selectivity of the eighth-order filter has at least 4.2 times improvement and five TZs are produced for high band-edge selectivity. Finally, the eighth-order dual-band filter is fabricated on MgO substrate with YBCO thin films. Measured results agree well with the simulations and show the excellent performance with 0.12-dB minimum insertion loss and better than -75-dB rejection level up to 5 GHz. In addition, the nonlinear characteristics of the fabricated HTS filter is observed by experiment, which shows the temperature dependence of filter center frequency performance and microwave insertion loss.
- Sprache
- Englisch
- Identifikatoren
- ISSN: 0018-9480eISSN: 1557-9670DOI: 10.1109/TMTT.2017.2690295Titel-ID: cdi_ieee_primary_7898802
- Format
- –
- Schlagworte
- Bandpass filters, Coupling, Couplings, Current distribution, Dual band, Filter design (mathematics), hairpin ring resonator (HRR), High temperature, high-order filter, High-temperature superconductors, Insertion loss, Microwave theory and techniques, Mobile communication systems, noncoupled mode, nonlinearity, Passband, Resonant frequency, Selectivity, Substrates, superconducting, Superconductivity, Temperature dependence, Thin films, transmission zero (TZ)