论文信息 - MICROWAVE PROPERTIES OF TUNABLE PHASE SHIFTER USING SUPERCONDUCTOR/FERROELECTRIC THIN FILMS

MICROWAVE PROPERTIES OF TUNABLE PHASE SHIFTER USING SUPERCONDUCTOR/FERROELECTRIC THIN FILMS

ABSTRACT High temperature superconductor, YBa2Cu3O7−δ (YBCO), and ferroelectric, Ba0.1Sr0.9TiO3 (BST), multilayer thin films were deposited on MgO (100) substrates using a pulsed laser deposition. The thin films exhibited only (00l) peaks of YBCO and BST. The HTS thin films demonstrated excellent zero resistance temperature of 92.5 K. We designed and fabricated HTS ferroelectric phase shifter using high frequency system simulator and standard photolithography method, respectively. The YBCO/BST phase shifter shows a low insertion loss (2.97 dB) and large phase change (162°) with dc bias of 40 V at operating frequency of 10 GHz. The HTS ferroelectric phase shifter shows 54 of figure of merit. These results can be applicable to phased array antenna system for satellite communication services.

[1] M. Kwak,et al. A K-Band Distributed Analog Phase Shifter Using Etched Ba0.6Sr0.4TiO3 Thin Films , 2004 .

[2] Eun-Kyoung Kim,et al. Orientation dependent microwave dielectric properties of ferroelectric Ba1−xSrxTiO3 thin films , 2003 .

[3] B. H. Moeckly,et al. Tunable HTS microwave filters using strontium titanate thin films , 2003 .

[4] Seungeon Moon,et al. Optimum Reflection-Type Phase Shifter Using (Ba,Sr)TiO3 Thin Film , 2003 .

[5] J. Contour,et al. Epitaxial YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta///SrTiO/sub 3/ heterostructures grown on LaAlO/sub 3/ substrate by pulsed laser deposition for voltage tunable microwave filter applications , 2001 .

[6] D. Reagor,et al. Superconductor/nonlinear-dielectric bilayers for tunable and adaptive microwave devices , 1997, IEEE Transactions on Applied Superconductivity.

[7] D. Galt,et al. Ferroelectric thin film characterization using superconducting microstrip resonators , 1995, IEEE Transactions on Applied Superconductivity.

[8] Takeshi Kobayashi,et al. Heteroepitaxial growth of quaternary BaxSr1-xTiO3 thin films by ArF excimer laser ablation , 1994 .

[9] T. Itoh,et al. Conductor-backed coplanar waveguide resonators of YBa/sub 2/Cu/sub 3/O/sub 7- delta / on LaAlO/sub 3/ , 1992, IEEE Microwave and Guided Wave Letters.