Microwave magnetometry is essential for the advancement of microwave technologies. We demonstrate a broadband microwave sensing protocol using the AC Zeeman effect with ensemble nitrogen-vacancy (NV) centers in diamond. A widefield microscope can visualize the frequency characteristics of the microwave resonator and the spatial distribution of off-resonant microwave amplitude. Furthermore, by combining this method with dynamical decoupling, we achieve the microwave amplitude sensitivity of 5.2 μ T / Hz, which is 7.7 times better than 40.2 μ T / Hz obtained using the protocol in previous research over a sensing volume of 2.77 μ m × 2.77 μ m × 30 nm. Our achievement is a concrete step in adapting ensemble NV centers for wideband and widefield microwave imaging.

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