Tunable Bandpass Filter Using Partially Magnetized Ferrites with High Power Handling Capability

Abstract

Low-loss tunable bandpass filters using partially magnetized ferrites is presented. A magnetic field tunable bandpass filter was designed based on partially magnetized yttrium iron garnet (YIG) operating at 6.17 GHz, which shows low insertion loss and a large frequency tunability of ~6% under a low bias field of 100Oe. Power handling measurement on the tunable bandpass filter with partially magnetized YIG slab showed an IP1dB of 11.5~18dBm within the bias field of 0 to 100 Oe, and over 30 dBm in a saturated state.