Abstract :
The linear "small-signal" properties of ferrites gave rise to several well-known microwave devices [1], [2], such as circulators, isolators, phase shifters, tunable oscillators, and tunable filters, that have had a significant impact on microwave systems following their first synthesis by Snoek [3], [4] in 1945. However, ferrites also show useful nonlinear "large-signal" properties that have been applied in power-limiter and power-enhancer devices. While these devices have not seen widespread application, their unique frequency-selective signal attenuation properties offer potential solutions to current and anticipated radiofrequency (RF) interference problems resulting from ever-increasing signal density and demands on scarce RF bandwidth.
Keywords :
Materials engineering; Materials processing; circuit tuning; ferrite circulators; ferrite isolators; ferrite phase shifters; microwave devices; nonlinear network synthesis; oscillators; radiofrequency interference; RF bandwidth; RF interference problems; circulators; frequency-selective signal attenuation properties; isolators; linear small-signal properties; microwave devices; microwave systems; nonlinear frequency selective ferrite devices; nonlinear large-signal properties; phase shifters; power enhancer devices; power-limiter devices; radiofrequency interference problems; signal density; tunable filters; tunable oscillators; Ferrites; Limiting; Magnetic fields; Magnetic resonance; Materials processing; Microwave devices; Power limiters; Radio frequency;
