Considering the 5G or 6G and 7G era, smart electromagnetic (EM) devices have received tremendous importance which works at high frequency (GHz). [2] The link failure and electromagnetic interference (EMI) for smart EM devices are common, creating severe problems. Electromagnetic pollution also can directly threaten living organisms, including human health. [4,6] To protect from electromagnetic threats, microwave absorbers are critically needed, and lightweight, corrosion-free, inexpensive, high microwave absorption efficiency materials are highly sought after. [3][4][5][6][7] The key interest in microwave absorption materials is to protect against electromagnetic threats and energy harvesting, especially for low-powered devices. [8,2] Microwave absorption materials can eliminate and consume the unwanted electromagnetic wave energy. [7] The conventional ferrites, [9,10] magnetic-dielectric composites, [11] carbon-based materials, [12], and hybrid aerogels [7] have been reported as promising microwave absorber. However, poly merbased materials are always preferred for microwave absorption due to many advantages such as lightweight, corrosion-resistant, flexible, and inexpensive. [2,7,12] The microwave absorption characteristics of a material is evaluated in terms of reflection loss (RL), and it intrinsically depends on several materials properties such as relative permittivity (ε r = ε′ − iε′′), permeability (μ r = μ′ − iμ′′) and external factors including thickness. [2,[8][9][10]12] The RL (dB) is calculated using the following standard equation [2,3,[8][9][10] (dB) 20 log in 0 in 0 absorption density due to the dielectric loss is intrinsically predominant in X-PVA compared to the pristine PVA. Further, the ratio of electromagnetic energy to heat energy conversion power (absorption) of X-PVA is much higher than pristine PVA, indicating the suitability for self-powered devices. X-PVA also fulfils many commercial requirements such as bulk level facile synthesis, large area fabrications, ultralight, and inexpensive.