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Phys."],"published-print":{"date-parts":[[2026,10,30]]},"abstract":"<jats:p>Precise control of near-field magnetic fields is essential for advancing microwave devices in quantum sensing and computing applications. In this study, we present a near-field magnetic shield based on a microscale planar metallic loop array operating in the GHz range. The fundamental shielding properties are elucidated through the analysis of a single loop element. Utilizing optically detected magnetic resonance and Rabi oscillation measurements of nitrogen-vacancy centers in diamond, we directly probe the microwave magnetic field in proximity to the loop element. Our measurements demonstrate that loop structures with a width of 200 \u03bcm attenuate the local magnetic field by approximately 70% at 2.84 GHz. Furthermore, numerical simulations reveal that effective shielding is preserved for loop widths down to several micrometers. 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