Novel Low-Profile Lossy Transmission Line Planar Matched Load for System Integration

A novel low-profile lossy transmission line planar matched load for system integration is proposed. To achieve wider bandwidth and optimize space utilization, the proposed matched load is realized using a high-order lossy interdigital filter consisting of lossy transmission lines with high loss tangent. The matched load function is ultimately achieved through energy dissipation during the transmission. With the assistance of artificial intelligence (AI) optimization technology, accurate multi-complex parameter optimization is realized. A low-profile planar matched load using a high-order lossy interdigital filter with dimensions of only $1.59\times 0.3\times 0.02~\lambda g$ is fabricated and tested. The input return loss bandwidths of 20 dB are in the range of 6.7–9.65 GHz, with a relative bandwidth of 36.1%.