Journal
IEEE TRANSACTIONS ON MAGNETICS
Volume 51, Issue 6, Pages -Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TMAG.2014.2368513
Keywords
Ferrite; microstrip structure; microwave; tunable phase shifter
Funding
- Ministry of Education and Science of the Russian Federation [3.528.2014K]
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This paper presents a new type of magnetically tunable phase shifter. The shifter has the structure of microstrip bandpass filter on a substrate containing magnetic material whose magnetic permeability is controlled by magnetic field due to ferromagnetic resonance. The phase shifter's operation is based on the fact that phase shift in a bandpass filter changes with tuning of its central frequency. Two types of devices were designed and fabricated for the UHF band. One of them has a five-layer NiFe film as an active medium and demonstrates a figure of merit of 40 degrees/dB achieved already at 20 Oe of the controlling magnetic field in 10% of the relative operational bandwidth. The second device with YIG ferrite as an active medium gave 360 degrees tunable phase shift in 5% operational bandwidth that corresponds to the figure of merit of 150 degrees/dB (3.1 degrees/dB.Oe).
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