Nonreciprocal Tunable Low-Loss Bandpass Filters With Ultra-Wideband Isolation Based on Magnetostatic Surface Wave

作者：Wu Jing^*; Yang Xi; Beguhn Shawn; Lou Jing; Sun Nian X

来源：IEEE Transactions on Microwave Theory and Techniques, 2012, 60(12): 3959-3968.

DOI：10.1109/TMTT.2012.2222661

• Inverted-L-shaped transducer
• linearity
• magnetostatic surface wave (MSSW)
• power handling
• tunable bandpass filter (T-BPF)
• tunable reconfigurable RF systems

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.

• 出版日期2012-12
• 单位东北大学