Interwoven MXene Sediment Architecture Empowers High‐Performance Flexible Microwave Devices

Abstract Flexible microwave devices are critical in wearable electronic systems for wireless communication, where highly conductive materials are essential to ensure optimal electromagnetic performance. Titanium carbide (MXene), renowned for its excellent conductivity, lightweight, and easy fabrication, emerges as a promising alternative to conventional metal materials in wearable electronics. However, the technical limitation of MXene suspensions or sediments in fabricating high‐performance microwave devices with low cost and scalable production present a huge challenge for their practical applications. Herein, an interwoven MXene sediment architecture is designed on natural cross‐linked textiles, achieving high material yield and superior conductivity simultaneously. The architecture breaks up the planar conductive behavior of conventional stacked MXene films, facilitating multi‐directional electron transport and pushing the conductivity of MXene sediment microwave devices up to 1.6 × 10 ⁶ S m ⁻¹ . The underlying mechanisms responsible for the improvement in conductivity are investigated using resistor network models and percolation theory. Moreover, the architecture demonstrates high performance in electromagnetic interference shielding, and supports high‐quality and long‐range wireless communications. This validation not only underscores the effectiveness of the interwoven MXene sediment architecture, but also establishes the MXene‐based microwave devices as a transformative component for the next generation of high‐performance flexible wireless communication technologies.