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A single tunable filter simplifies complexity, reduces insertion loss, andminimizes size compared to frequency switchable filter banks commonly used forradio frequency (RF) band selection. Magnetostatic wave (MSW) filters stand outfor their wide, continuous frequency tuning and high-quality factor. However,MSW filters employing electromagnets for tuning consume excessive power andspace, unsuitable for consumer wireless applications. Here, we demonstrateminiature and high selectivity MSW tunable filters with zero static powerconsumption, occupying less than 2 cc. The center frequency is continuouslytunable from 3.4 GHz to 11.1 GHz via current pulses of sub-millisecond durationapplied to a small and nonvolatile magnetic bias assembly. This assembly islimited in the area over which it can achieve a large and uniform magneticfield, necessitating filters realized from small resonant cavitiesmicromachined in thin films of Yttrium Iron Garnet. Filter insertion loss of3.2 dB to 5.1 dB and out-of-band third order input intercept point greater than41 dBm are achieved. The filter's broad frequency range, compact size, lowinsertion loss, high out-of-band linearity, and zero static power consumptionare essential for protecting RF transceivers and antennas from interference,thus facilitating their use in mobile applications like IoT and 6G networks.

Frequency Tunable Magnetostatic Wave Filters With Zero Static Power Magnetic Biasing Circuitry