Superconducting NbTi and Pb(Cu) bandpass filters
Abstract
Superconducting NbO.45Ti0.55 and Pb electroplated on Cu bandpass microwave filters were constructed to investigate their low loss properties at 4.7 K. An interdigital stripline filter configuration was selected as the optimum structure for future applications. The filter was designed to operate at 8.45 GHz with an equal ripple bandwidth of 0.15 GHz. The insertion loss and the noise temperature contribution were measured at 4.7 K. In addition, the insertion loss was studied as a function of out of band power (up to 1 watt) and temperature (4.7 K up to Tc). Results of an oxygen free high conductivity Cu filter are included for comparison.
- Publication:
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IEEE Transactions on Magnetics
- Pub Date:
- March 1985
- DOI:
- Bibcode:
- 1985ITM....21..640B
- Keywords:
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- Bandpass Filters;
- Deep Space Network;
- Noise Temperature;
- Superconductivity;
- Electroplating;
- Field Effect Transistors;
- Radio Frequency Interference;
- Superhigh Frequencies;
- Electronics and Electrical Engineering