Advances in the application of high $T_{\rm c}$ superconductors to microwave devices for analog signal processing J. C. Mage, B. Marcilhac, M. Mercandalli, Y. Lemaître, S. Barrau, B. Dessertenne, D. Mansart, J. P. Castera and P. Hartemann J. Phys. III France, 4 7 (1994) 1285-1294 DOI: 10.1051/jp3:1994190