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Researchers developed a microwave delay platform using magnetostatic surface waves (MSSWs) propagating in microfabricated 18 µm yttrium iron garnet (YIG) waveguides, achieving continuous frequency tuning from 6 to 19.6 GHz through magnetic bias adjustment. By co-engineering spin wave dispersion with the radiation impedance of meander-line transducers, the system delivers group delays between 3.3 and 42.8 ns, insertion losses of 2.5 to 10.1 dB, and nonreciprocal isolation of 24 to 39 dB, all measured directly into a standard 50 Ω impedance without external matching networks. The platform achieves propagation Q-factors rising from 3002 to 4893 across its operating range, surpassing state-of-the-art fixed-frequency acoustic delay lines at every benchmarked frequency point.
Why it matters
This technology addresses a critical gap in reconfigurable radio-frequency front ends for radar and wireless communication systems, where existing electromagnetic, acoustic, photonic, and active-circuit solutions each fail to simultaneously provide low loss, low noise, compact size, and wide frequency agility. Practical deployment in next-generation RF signal processing, including 5G/6G systems and advanced radar, could benefit from this compact, wideband, and tunable delay solution.
arXiv:2605.12848v2 Announce Type: replace
Abstract: Reconfigurable radio-frequency front ends in modern radar and wireless systems require delay elements that simultaneously offer low-loss, low noise, compact form factor, and wideband frequency agility. However, electromagnetic, acoustic, photonic, and active-circuit delay technologies each fail to deliver this combination. Here we report a microwave delay platform based on magnetostatic surface waves (MSSWs) in microfabricated 18 $mu$m yttrium iron garnet (YIG) waveguides, in which co-engineering the spin wave dispersion with the radiation impedance of meander-line transducers grants pitch-controlled access to distinct dispersive or near-constant group-delay regimes. Tuned continuously from 6 to 19.6 GHz under magnetic bias, the delay lines deliver group delays of 3.3 to 42.8 ns at insertion losses of 2.5 to 10.1 dB and nonreciprocal isolation of 24 to 39 dB, all measured directly into 50 $Omega$ without external impedance matching. Length-resolved characterization yields unit-time propagation losses of 56 to 109 dB/$mu$s and propagation Q-factors that rise monotonically from 3002 to 4893 across the operating range, exceeding state-of-the-art fixed frequency acoustic delay lines at every benchmarked frequency. These results establish microfabricated YIG as a versatile, low-loss microwave platform for next-generation reconfigurable RF signal processing.
Source: Dispersion Engineered Frequency Tunable Delay Platform based on Magnetostatic Surface Waves