AN HTS NARROW BANDWIDTH COPLANAR SHUNT INDUCTIVELY-COUPLED MICROWAVE BANDPASS FILTER ON LAALO3

Coplanar waveguide bandpass filters with shunt inductively coupled res onators using high-temperature superconductors (HTS's) on LaAlO3 subst rates were developed for high packing density, narrow bandwidth, and l ow power applications, The computer-aided design and measurements on r esonators to test weak end-coupling are described in this paper, A cop lanar three-pole Chebychev bandpass filter with 1.8% 3-dB bandwidth at 10 GHz and 1,3-dB insertion loss at 77 K was fabricated and measured, The maximum superconducting current density of the filter is evaluate d.