Design of ISGW Unequal Power Divider Based on Ultra-Wideband Metamaterial Absorber

This paper presents an effective method based on the concept of indium tin oxide (ITO) films designed metamaterial absorber to achieve unequal power divider. The structural unit of the proposed metamaterial absorber consists of three films, a foam dielectric substrate and a metallic copper. By properly adjusting the resonance of the structure, an optimized metamaterial absorption rate of greater than 90% from 21 to 35 GHz is achieved, and a strong absorption effect of ultra-broadband for incident electromagnetic waves at different polarization angles and different incidence angles is achieved, which is in good agreement with the numerical simulation results, and an equivalent circuit model is extracted to explain its operation mechanism. The designed metamaterial is loaded on an Integrated Substrate Gap Waveguide (ISGW) based power divider. Simulation results show that the 4:1 unequal power divider achieves a relative bandwidth of 24% in the operating band 22–28 GHz, and the isolation is better than 15dB, and the return loss is greater than 10dB.