Dual-mode MMW/IR simulation of beam combiner

Along with the development of the optoelectronic interference technology, invisible technology and anti-radiation missile technology, missile guidance with single band or single mode cannot adapt for modern warfare. So the technology of combined guidance is proposed. In the field of combined guidance, MMW/IR combined guidance is more significant. The critical component of the MMW/IR semi-physical simulation will be discussed in this paper, and the selection principle of the substrate and coating materials used for dichroic beam combiner (DBC) is analyzed: MMW/IR beam combiner. By researching the method of the beam combiner of 8–18 GHz MW and 3–5 μm IR, the theory and simulation are discussed in detail in this paper. And the result is given. At the same time, the distortion effect on the MMW signal is analyzed theoretically and the method is presented. Substrate material is selected. The main problems and study factors include: MMW transmission, insertion phase delay, size of substrate material, and coating. At last, the substrate material is determined, and the thickness of the substrate material is optimized.