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As the sample size of repeating fast radio bursts (FRBs) has grown, anincreasing diversity of phenomenology has emerged. Through long-termmulti-epoch studies of repeating FRBs, it is possible to assess which phenomenaare common to the population and which are unique to individual sources. Wepresent a multi-epoch monitoring campaign of the repeating FRB source 20180301Ausing the ultra-wideband low (UWL) receiver observations with Murriyang, theParkes 64-m radio telescope. The observations covered a wide frequency bandspanning approximately 0.7--4 GHz, and yielded the detection of 46 bursts. Noneof the repeat bursts displayed radio emission in the range of 1.8--4 GHz, whilethe burst emission peaked at 1.1 GHz. We discover evidence for secular trendsin the burst dispersion measure, indicating a decline at a rate of$-2.7\pm0.2\,{\rm pc\,cm^{-3}\,yr^{-1}}$. We also found significant variationin the Faraday rotation measure of the bursts across the follow-up period,including evidence of a sign reversal. While a majority of bursts did notexhibit any polarization, those that did show a decrease in the linearpolarization fraction as a function of frequency, consistent with spectraldepolarization due to scattering, as observed in other repeating FRB sources.Surprisingly, no significant variation in the polarization position angles wasfound, which is in contrast with earlier measurements reported for the FRBsource. We measure the burst rate and sub-pulse drift rate variation andcompare them with the previous results. These novel observations, along withthe extreme polarization properties observed in other repeating FRBs, suggestthat a sub-sample of FRB progenitors possess highly dynamic magneto-ionicenvironments.

Spectropolarimetric variability in the repeating fast radio burst source FRB 20180301A