Frequency tunable magnetostatic wave filters with zero static power magnetic biasing circuitry

• DOI: 10.1038/s41467-024-47822-3
• Publication Date: 2024-04-27T12:01:47Z
• Authors: Xingyu Du; Mohamad Hossein I...; Yixiao Ding; Tao Zhang; Alexander J. Geers; Shun Yao; Jun Beom Pyo; Firooz Aflatouni; Mark Allen; Roy H. Olsson
• Keywords: Center frequency; Linearity; Biasing; Millisecond; Transceiver

Abstract A single tunable filter simplifies complexity, reduces insertion loss, and minimizes size compared to frequency switchable banks commonly used for radio (RF) band selection. Magnetostatic wave (MSW) filters stand out their wide, continuous tuning high-quality factor. However, MSW employing electromagnets consume excessive power space, unsuitable consumer wireless applications. Here, we demonstrate miniature high selectivity with zero static consumption, occupying less than 2 cc. The center is continuously from 3.4 GHz 11.1 via current pulses of sub-millisecond duration applied a small nonvolatile magnetic bias assembly. This assembly limited in the area over which it can achieve large uniform field, necessitating realized resonant cavities micromachined thin films Yttrium Iron Garnet. Filter loss 3.2 dB 5.1 out-of-band third order input intercept point greater 41 dBm are achieved. filter’s broad range, compact size, low linearity, consumption essential protecting RF transceivers interference, thus facilitating use mobile applications like IoT 6 G networks.