A Microwave Nonreciprocal Notch Filter Tunable by a Surface Acoustic Wave in Dynamic Magnonic Crystals

The results of using a dynamic magnonic crystal, which is created by a surface acoustic wave (SAW) in the structure of a film of yttrium iron garnet on a gallium gadolinium garnet substrate, for the development of a tunable nonreciprocal microwave filter are presented. A filter prototype that operat...

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Bibliographic Details
Published in:Instruments and experimental techniques (New York) 2019, Vol.62 (1), p.42-46
Main Authors: Kryshtal, R. G., Kundin, A. P., Medved, A. V.
Format: Article
Language:English
Subjects:
Electrical Engineering
Electronics and Radio Engineering
Gadolinium
Gallium
Measurement Science and Instrumentation
Microwave filters
Notch filters
Physical Chemistry
Physics
Physics and Astronomy
Rejection
Substrates
Surface acoustic waves
Yttrium
Yttrium-iron garnet
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Summary:The results of using a dynamic magnonic crystal, which is created by a surface acoustic wave (SAW) in the structure of a film of yttrium iron garnet on a gallium gadolinium garnet substrate, for the development of a tunable nonreciprocal microwave filter are presented. A filter prototype that operates in the range of 3600–4200 MHz at a magnetic bias field of 640 Oe was developed and its main characteristics were measured. At a SAW frequency of 41 MHz and a power of 30 mW, the rejection depth was 23 dB. A SAW-frequency change by 1 MHz shifted the rejection frequency by ~7 MHz. The inversion of the signal-propagation direction in the device resulted in a shift of the rejection frequency by the value of the SAW frequency. The possibilities of the further improvement of the parameters of this device are discussed.
ISSN:0020-4412
1608-3180
DOI:10.1134/S0020441219010123