Analysis of coupling effects to PCBs with adjacent compartments inside waveguide using the mBLT equation

In this paper, coupling effects to PCBs are investigated with three cases of adjacent compartments inside a missile, which is simplified to a rectangular waveguide structure. When calculating the coupling effects to a target PCB inside waveguides, it is found that the configurations of electric systems inside the adjacent compartment can be ignored. Whereas the coupling effects are dominantly influenced from the parallel-plate resonance characteristics of a target PCB itself, as well as a metal frame structure of the waveguide including apertures. The calculated results are achieved using the mBLT equation and compared with full-wave analysis results, showing good agreements.