The paper presents a microwave ultra-broadband polarization-independent metamaterial absorber (MA) composed of a periodic array of metal-dielectric multilayered quadrangular frustum pyramids. These pyramids exhibit resonant absorption modes at multiple frequencies, leading to total absorption over an ultra-wide spectral band. The experimental absorption at normal incidence is above 90% in the frequency range of 7.8–14.7 GHz, and the absorption remains high when the incident angle is less than 60 degrees. Numerical simulations and experimental results show excellent agreement. The ultra-broadband absorption is attributed to the resonant modes supported by the pyramids, which can be tuned by adjusting the width and height of the pyramids. The design can be extended to other frequencies, such as terahertz, infrared, and optical frequencies, making it a promising candidate for controllable ultra-broadband absorbers or thermal emitters.The paper presents a microwave ultra-broadband polarization-independent metamaterial absorber (MA) composed of a periodic array of metal-dielectric multilayered quadrangular frustum pyramids. These pyramids exhibit resonant absorption modes at multiple frequencies, leading to total absorption over an ultra-wide spectral band. The experimental absorption at normal incidence is above 90% in the frequency range of 7.8–14.7 GHz, and the absorption remains high when the incident angle is less than 60 degrees. Numerical simulations and experimental results show excellent agreement. The ultra-broadband absorption is attributed to the resonant modes supported by the pyramids, which can be tuned by adjusting the width and height of the pyramids. The design can be extended to other frequencies, such as terahertz, infrared, and optical frequencies, making it a promising candidate for controllable ultra-broadband absorbers or thermal emitters.