Planar YIG filters
Abstract
The design and performance of modified YIG filters for microwave applications are reported. Single-crystal YIG spheres are glued into conical holes drilled to make the sphere center coplanar with the surface of the low-loss dielectric substrate plate, and planar coupling structures are formed with microstrips by photolithography. Precise sphere orientation is achieved using a nested-Helmholtz-coil apparatus, and temperature-dependent frequency variation over the range 20-100 C is limited to 5 MHz or less (at 10 GHz). It is calculated that eddy-current-induced frequency shift and line broadening are zero and negligible, respectively, in the planar YIG filter.
- Publication:
-
IEEE Transactions on Magnetics
- Pub Date:
- September 1984
- DOI:
- 10.1109/TMAG.1984.1063519
- Bibcode:
- 1984ITM....20.1219B
- Keywords:
-
- Frequency Stability;
- Microwave Filters;
- Planar Structures;
- Resonant Frequencies;
- Tuning;
- Yttrium-Iron Garnet;
- Eddy Currents;
- Frequency Control;
- Frequency Shift;
- Photolithography;
- Single Crystals;
- Spectral Line Width;
- Thermal Stability;
- Electronics and Electrical Engineering