Title :
Superconductor/nonlinear-dielectric bilayers for tunable and adaptive microwave devices
Author :
Findikoglu, A.T. ; Jia, Q.X. ; Reagor, D.W.
Author_Institution :
Div. of Mater. Sci. & Technol., Los Alamos Nat. Lab., NM, USA
fDate :
6/1/1997 12:00:00 AM
Abstract :
Microwave devices using coplanar waveguide (CPW) structures which incorporate bilayers of superconducting YBa/sub 2/Cu/sub 3/O/sub 7-x/ and nonlinear dielectric SrTiO/sub 3/ on 1 cm/spl times/1 cm/spl times/0.5 mm LaAlO/sub 3/ substrates. The microwave devices include voltage-tunable phase shifters and delay lines, voltage-tunable mixers, and voltage-tunable and adaptive bandpass filters. Under dc voltage bias, these compact CPW devices exhibit more than 360/spl deg/ relative phase shift at 2 GHz, more than 30 dB tunability in mixed microwave power between 0.7 GHz and 5.9 GHz, and fine-tunable symmetric filter profile at around 2.5 GHz with less than 2% bandwidth and more than 15% adaptive range.
Keywords :
adaptive systems; barium compounds; coplanar waveguides; dielectric devices; dielectric thin films; high-temperature superconductors; strontium compounds; superconducting microwave devices; superconducting thin films; yttrium compounds; 0.7 to 5.9 GHz; LaAlO/sub 3/; YBa/sub 2/Cu/sub 3/O/sub 7/-SrTiO/sub 3/; bandpass filter; coplanar waveguide; delay line; mixer; phase shifter; superconductor/nonlinear dielectric bilayer; voltage-tunable adaptive microwave device; Adaptive filters; Band pass filters; Coplanar waveguides; Delay lines; Dielectric devices; Dielectric substrates; Microwave filters; Phase shifters; Superconducting microwave devices; Voltage;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
