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- 1989 (8) (remove)

We present the first coplanar waveguide transmission line resonator patterned from a perovskite high Tc superconducting film at 9 GHz. At 77 K the unloaded quality factor Q0 of the resonator patterned from a YBa2Cu3O7−x film on a MgO substrate is 1300, that is, 14 times higher than that of the copper resonator and 17 times higher than that of the gold resonator at the same temperature. At 4.2 K a Q0 factor of 3300 was measured for the YBa2Cu3O7−x /MgO resonator. Simple calculations of the quality factor show that values of 10 000 at 77 K should be possible using better substrates, films, and etching techniques. This resonator could form the basic structure of more complex microwave filter systems operating at liquid‐nitrogen temperatures.

Reports on quality factor measurements of a coplanar waveguide transmission line resonator patterned from a YBa/sub 2/Cu/sub 3/O/sub 7-x/ film on a LaAlO/sub 3/ substrate, resonating at 6.5 GHz. At 77 K the unloaded quality factor is 3850+or-180, that is about 43 times higher than that of an identical copper resonator at the same temperature and frequency. This result demonstrates the usefulness of LaAlO/sub 3/ as a substrate for high-temperature superconducting microwave applications.

Two Rosenbrock-Wanner type methods for the numerical treatment of differential-algebraic equations are presented. Both methods possess a stepsize control and an index-1 monitor. The first method DAE34 is of order (3)4 and uses a full semi-implicit Rosenbrock-Wanner scheme. The second method RKF4DA is derived from the Runge-Kutta-Fehlberg 4(5)-pair, where a semi-implicit Rosenbrock-Wanner method is embedded, in order to solve the nonlinear equations. The performance of both methods is discussed in artificial test problems and in technical applications.

After introducing the waveform relaxation (WR) concept, the authors briefly describe how WR was implemented in the simulator SISAL. They analyze a refinement of WR called waveform relaxation Newton (WRN). They reveal the interrelation of both methods and introduce an improved implementation technique of the WRN algorithm. Numerical results are reported.

Unternehmensakquisition
(1989)