Spinwave Bandpass Filters for 6G Communication

TL;DR

This paper presents a novel spinwave bandpass filter architecture using yttrium iron garnet that achieves wide bandwidth, tunability over multiple octaves, low loss, and high linearity, suitable for future 6G communication systems.

Contribution

The authors introduce a wafer-scale manufacturable spinwave filter with a single external magnetic bias, significantly improving bandwidth and tunability over previous designs.

Findings

Bandwidth up to 663 MHz achieved

Center frequency tunable from 7.08 to 21.6 GHz

Loss as low as 2.54 dB and high linearity with third-order intercept point over 11 dBm

Abstract

Spinwave filters using single-crystal yttrium iron garnet are an attractive technology for integration in frequency adjustable or tunable communication systems. However, existing SW devices do not have sufficient bandwidth for future 5G and 6G communication systems, are too large, or have strong spurious passbands creating unintentional cross-channel interference. Leveraging modern micromachining fabrication methods capable of wafer-scale production, we report a SW ladder filter architecture requiring only a single external magnetic bias. The filters demonstrate loss as low as 2.54 dB, bandwidths up to 663 MHz, center frequency tuning over multiple octaves from 7.08-21.6 GHz, and high linearity with an input referred third-order intercept point over 11 dBm in the passband. The filter's operation is also experimentally demonstrated in a frequency tunable radio system.