Microwave resonators incorporating ceramic YBaCuO helices
Abstract
Measurements of the unloaded Q factors of resonators incorporating YBaCuO helices are presented as a function of temperature. All of the bulk helices give unloaded Qs higher at 77 K for frequencies less than 1 GHz than equivalent wholly Cu structures. Approximate microwave modeling of the resonator gives surface resistances around 1 microohm at 77 K and 500 MHz. Initial measurements on thick-film YBaCuO helices give Q values significantly lower than the bulk, probably due to dielectric loss in the zirconia substrate. The enhancement in Q over similar Cu resonators make these devices useful for demonstration purposes. For practical applications, however, it is unlikely that the improvement observed will affect the status of low-noise microwave oscillators and filters.
- Publication:
-
IEEE Transactions on Magnetics
- Pub Date:
- March 1991
- DOI:
- 10.1109/20.133827
- Bibcode:
- 1991ITM....27.2948P
- Keywords:
-
- Electrical Measurement;
- Electrical Resistance;
- Helices;
- Microwave Resonance;
- Q Factors;
- Yttrium Oxides;
- Barium Oxides;
- Copper Oxides;
- Mixed Oxides;
- Resonators;
- Rlc Circuits;
- Thick Films;
- Electronics and Electrical Engineering