Title :
A New Broadband 50 OHM Coaxial- to 1 OHM Microstrip Transition for Superconducting Thin Film Devices with Low Input Impedance
Author :
Daginnus, M. ; Schattat, O. ; Hinken, J.H.
Author_Institution :
Institut fÿr Hochfrequenztechnik, Technische Universitÿt Braunschweig, P.O.Box 3329, D-3300 Braunschweig, Germany
Abstract :
We report on the development of a new transition from a 50 Ohm coaxial line to a 1 Ohm microstrip line. The impedance transformation is done with a three step microstrip quarter-wave-transformer, where the width of the strip and the height of the air dielectric between strip and back-electrode are changed step by step. The thin film strip is evaporated on low loss LaAlO3-substrate. The transition has a transmission loss of less than 2 dB between 16.1 and 17.9 GHz, and less than 3 dB between 15.8 and 20.0 GHz.
Keywords :
Coaxial components; Dielectric losses; Dielectric thin films; Impedance; Microstrip; Strips; Substrates; Superconducting microwave devices; Superconducting thin films; Yttrium barium copper oxide;
Conference_Titel :
Microwave Conference, 1991. 21st European
Conference_Location :
Stuttgart, Germany
DOI :
10.1109/EUMA.1991.336382
