Fabrication of novel 22 GHz hairpin type HTS microstrip ®lter using laser ablated thin ®lms

The fabrication of high quality superconducting thin ®lms using pulsed laser deposition (PLD) has been reported to ®nd optimized processing conditions and to make millimeter-wave devices. High temperature superconducting (HTS) YBCO ®lms were prepared on MgO (10mm 10mm 0:5 mm) substrates by PLD. The 3-pole bandpass ®lter centered at 22 GHz for satellite communication was designed consisting of hairpin type coupled-lines to reduce the con®guration in size. YBCO ®lms are c-axis oriented and show superconductive transition temperatures of 88±89 K with the transition widths <0.5 K. The insertion loss of passband at 70 K was about 5 dB. The measured frequency response of superconducting ®lter will be compared with the simulation result. # 2000 Elsevier Science B.V. All rights reserved.