Accurate modeling of metal plate-loaded loop-coupled cavities with slots

In this letter, we analyze the problem of the electromagnetic field radiate d from apertures in coaxial fed metal enclosures loaded with metal inserts. Such situations are found, for example, in PC environments where slots and apertures are used for the purpose of heat dissipation, CD-ROMs, cable pen etration etc. We derive an accurate model of the entire structure, includin g the coaxial line-to-loop-to-cavity feed and the inner metal planes, simul ating the presence of the circuitry inside. The analysis is developed hy me ans of the hybrid transmission line matrix-integral equation (TLM-IE) metho d and theoretical results are compared with experimental ones showing very good agreement. The evaluation of the reflection coefficient and of the lev el of radiated emission as functions of the metal plates position is very h elpful toward the engineering design of the entire structure, The numerical simulations require rather low computational effort.