Design of Chaotic Cavities with Curved Wave Diffractors for Enhanced   Low-Frequency Operation
  Some numerical calculations are presented on the dependence of the average mode count and average mode density of electromagnetic cavities on their specific geometric design, based on the generalized Weyl law. The analysis focuses on a chaotic quasi-cubic cavity furnished with curved wave diffractors placed on its interior surface. The focus is on a design that increases the mode density and Q at relatively low frequencies. The results are of interest in reducing the `lowest usable frequency' and increasing the maximum field strength inside mode-stirred reverberation chambers. 
L. R. Arnaut
physics.class-ph