Figure 4

Simulated electric field patterns for higher order modes.

(a) is the electric field pattern for cavity mode with m = 2. (b) is the electric field pattern for cavity mode with m = 3. In the simulations, the core media (region 3) are air. For MNZ shells (region 2), the parameters are R₁ = 15 mm, R₂ = 30 mm, μ₂ = 10⁻³ and ε₂ = 1. A line source with a current 1 A is positioned at the coordinate (10 mm, 0).