期刊
IEEE TRANSACTIONS ON MAGNETICS
卷 40, 期 4, 页码 2844-2846出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TMAG.2004.832117
关键词
devices; ferrites; garnets; microwave
Frequency selective limiters (FSLs) have potential application in maintaining the dynamic range of RF receivers in the presence of interference. Stripline FSLs, fabricated using thick YIG films, have been described previously and are suitable for broadband, microwave applications. Here a magnetostatic wave (MSW) FSL operating in the 400 MHz to 800 MHz frequency range is described with frequency selectivity and threshold power levels 100 times lower than achieved with stripline devices. Y3Fe(5-x-y) Ga-x Sc-y O-12 (ScGaYIG) films with reduced 4piM and anisotropy field were grown by LPE and characterized for DeltaH, DeltaH(k) and 4piM Devices were characterized for insertion loss, threshold power level, limiting, frequency selectivity and intermodulation products. FSLs in UHF through S-band (400 MHz to 4 GHz) are feasible with present YIG and ScGaYIG materials. Threshold power levels <20 dBm, narrow selectivity bandwidth <2 MHz and low intermod levels have been demonstrated.
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