Design and test of new cement based microwave absorbing materials

Combined with space electromagnetic wave propagation principle, a design idea of space wave impedance matching to advantage absorption and matching for new cement based microwave absorbing materials (CBMAM) is given to aim at the current existing problems for CBMAM in this paper. To test and verify this idea, continuous basalt fiber, spherical expansion perlite with closed pore and graphite are used as components. A new CBMAM characterized with better microwave absorbing properties (the minimum reflectivity is -11.8 dB), wide frequency bandwidth (reflectivity less than -10 dB reaches 4GHz of bandwidth), better mechanical properties (28 d compressive strength is 16.9Mpa, bending strength is 2.27 Mpa), is prepared by using 20 mm sample between 8 to 18 GHz. The results provide a basis to the design and preparation of CBMAM.