Table 5.

The predicted frequencies of the localized defect mode near the first standing wave frequency (Ω₀=0.210161050669707; cf. table 1) for the comb-like structure with a=7 (cf. figure 2d). The frequencies Ω_HFH come from the asymptotics (4.5), whereas Ω_num gives predictions from FEM simulations. The parameter ϵ controls the variation of tooth height in (4.1).

ϵ	ΩHFH	Ωnum
0.125	0.21247	0.21252
0.0625	0.21074	0.21079