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Lett."],"published-print":{"date-parts":[[2026,9,15]]},"abstract":"<jats:p>High-purity magnetic quadrupole (MQ) radiation is fundamentally limited by ultralow radiative transition rates and severe mode mixing. Here, we propose a synergistic strategy combining parity-selective mode filtering and anapole engineering to realize ideal MQ radiation. Our design achieves an MQ mode-purity-factor (MPF) exceeding 99.5% under both far-field plane-wave and near-field dipole excitations. Critically, this mechanism enables the direct, contamination-free conversion of fundamental electric dipole (ED) emission into pure MQ radiation. 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