Broadband metalenses consist of sub-wavelength phase gradient elements are indispensable in modern science and technology. So far, several broadband optical metalenses are demonstrated but mostly with either small NA or relatively low focusing efficiency. Herein, an ultra-thin broadband microwave metalens (frequency range from 8.0GHz to 10.5GHz) with both high-efficiency above 40% and large NA more than 0.6 is presented. The metalens is also fabricated and the measurement results agree with the simulations very well. The performances of the presented broadband metalens can surpass nowadays microwave metalens largely and open up new vistas for low-profile, low-cost and light-weight microwave components.
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