期刊
IEEE TRANSACTIONS ON MAGNETICS
卷 40, 期 4, 页码 2841-2843出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TMAG.2004.834197
关键词
shape anisotropy; stop-band filters
The magnetic/dielectric hybrid transmission line structures provide a new class of microwave/millimeter wave devices, useful for signal processing. Reduction of device dimensions in these magnetic monolithic microwave integrated circuits (M-MIMICs) is important from the cost and reliability point of view. Here, we explore the transmission characteristics of Fe and Permalloy based microstrip filters with microstrips of different widths, lengths, and thicknesses. The gyromagnetic resonance occurs at microwave frequencies of up to 12 GHz for Fe and 5 GHz for Permalloy, even in the absence of any dc magnetic field. The resulting absorption yields the stop-band behavior of the device. Our microstrip geometry significantly boosts the operational frequency due to an induced shape-anisotropy. Different geometries induce different demagnetization factors and hence different resonance frequencies. We calculate the frequency-boosting characteristics of the devices due to induced shape-anisotropy and observed a good match to our measurements.
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