Microwave losses in GGG

1 January 1976

proceedings article
Published by AIP Publishing in AIP Conference Proceedings

Vol. 29 (1) , 643-644
https://doi.org/10.1063/1.30496

Abstract

Realisation of low‐loss microwave devices using YIG grown by LPE on gadolinium gallium garnet (GGG) imposes severe constraints not only on the dielectric and magnetic losses in the YIG but also in the single crystal GGG substrate. Measurements of dielectric loss in GGG show that tan δ d <2×10−4 at X‐band. In contrast, the magnetic loss in GGG is found to be both frequency and bias field dependent. At 30 GHz a full resonant absorption is observed in a cylindrical GGG resonator with a linewidth of approximately 7k Oe and ’g’ splitting factor of approximately 2. These results are consistent with broad paramagnetic resonance of the Gd3+ ion. For devices operating in X‐band the effective tan δ is thereby restricted to 10−3, whereas for devices operating at 2 GHz th eeffective tan δ is 2×10−4.

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