Single-crystal YIG phase shifter using composite stripline structure at X band

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Abstract
A tunable phase shifter at X band using single-crystal YIG film material grown on GGG substrates is fabricated. The phase shifter is a quarter wavelength in the absence of a bias magnetic field. The phase can be tuned 120° by varying the bias magnetic field from 3440 to 3720 Oe. The resultant variation in insertion loss was 0.5 dB. Measurements compared very well with calculations.

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