Auto-tune Filters for Receiver Protection in Space Applications

Metamagnetics proposes to develop Auto-tune Filter (AtF) technology for space-based radio receiver/transceiver protection from electromagnetic interference and jamming. Metamagnetics’ AtF is fast-reacting, adaptive (in terms of frequency selectivity and power levels), passive, miniature, low-cost component  technology that can simply be placed after the antenna to enable radio receivers to continuously operate in the presence of interference. Being passive, it does not require any power supply, which is extremely advantageous for size, weight, and power-constrained platforms such as satellites. Unlike traditional fixed/tunable notch filters, active beam nulling, and solid-state limiters, the AtF can automatically track threats and frequency selectively suppress unwanted EMI based on its power level, while small signals of interest (below the designated threshold) will pass unaffected.  It has fast response in real time, without any user input and adaptive algorithms. An AtF can selectively suppress multiple dynamic threats simultaneously that are changing in both power level and frequency, all without affecting signals of interest. Our AtFs employ physical properties of thin ferrite films and interaction of pure magnetic spin oscillations with RF/microwave signals. Metamagnetics has been growing high-quality ferrite films on dielectric substrates using Liquid Phase Epitaxy for applications in AtFs and other devices. Metamagnetics’ has already developed, fabricated, and tested a series of AtF devices  for operating over a wide frequency range from 100 MHz through 20 GHz with power thresholds ranging from -50 dBm to +30 dBm. In this proposed project, Metamagnetics plans to demonstrate prototype space compatible AtF technology. The proposed technology will be adapted to applications in harsh space conditions, including vibrations and mechanical shock. Application of the proposed technology will assure the integrity of satellite radio communication (SATCOM) links, especially those in low-earth orbit (LEO).