APPLIED TO SUPERCONDUCTING THIN-FILM
Li Zhu, L.J.P. Linnér · 1991
In this paper, a detailed analysis of properties of mixed lumped and distri- Buted(MLD) lossless network is first carried out, from wmch the reason why the MLD network can be used as an extreme impedance transformer between source and load impedances without using extreme impedance values in the network is found. Then, the lossy transformation tec- hniq~e(~I, which can be employed for the transformation between MLD lossy or lossless network and lumped lossless 0ne(~8~), is discussed and corn ared with the method deve- loped by Carlink). Finally, as an example, one quarter-wave and two MLD lossless broadband impedance transformers are synthesized for transforming extremely low input or output impedance of a superconducting device to 500 microwave system and the lossy perfor- mance of one of the MLD transformers is esti- mated by means of the lossy transformation technique.