Tunable Wideband Microwave Band-Stop and Band-Pass Filters Using YIG/GGG-GaAs Layer Structures

摘要

Tunable wideband microwave band-stop and band-pass filters using ferromagnetic resonance absorption in yttrium iron garnet / gadolinium gallium garnet-gallium arsenide (YIG/GGG-GaAs) layer structures are reported. The measured characteristics of the band-stop filter shows a tuning range as large as 2-20 GHz in the resonance frequency with the corresponding magnetic field tuning range of 600-5,500 Guass. The peak absorption of 11-37 dB in the microwave output power has also been measured. The measured characteristics of the band-pass filters showing the tunable passband center frequency of 6.90 GHz and 7.90 GHz have been accomplished using the corresponding two pairs of magnetic fields of 1400 and 1800 Gauss, and 1800 and 2200 Guass, respectively . A good agreement between the experimental results and the simulation results based on a lumped-element equivalent circuit modeling of YIG band-stop filters has been achieved.