Journal
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
Volume 60, Issue 12, Pages 3959-3968Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TMTT.2012.2222661
Keywords
Inverted-L-shaped transducer; linearity; magnetostatic surface wave (MSSW); power handling; tunable bandpass filter (T-BPF); tunable reconfigurable RF systems
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Funding
- Office of Naval Research SBIR Award [N0001411M0187]
- Air Force Research Laboratory [UES FA8650-090-D-5037]
- MIT Lincoln Laboratory
- United States Air Force [FA8721-05-C-0002]
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [746810] Funding Source: National Science Foundation
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A new type of nonreciprocal C-band magnetic tunable bandpass filter (BPF) with ultra-wideband (UWB) isolation is presented. The BPF was designed with a 45 degrees rotated yttrium iron garnet (YIG) slab loaded on an inverted-L-shaped microstrip transducer pair. With external in-plane magnetic fields from 1.1 to 1.9 kOe, the central frequency of the filter was tuned from 5.2 to 7.5 GHz, with an insertion loss of 1.6-3 dB and an UWB isolation of more than 20 dB, which was attributed to the nonreciprocity characteristics of the magnetostatic surface wave. In addition, the measured result demonstrated power-handling capabilities of over 30 dBm under room temperature. The proposed prototype with dual functionality of a tunable BPF and an UWB isolator will have many applications in RF front-end and other microwave circuits.
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