Figure 5

Simulated electric field distribution patterns for different types of sources.

(a) The excited monopole mode by a line source inside the cavity. (b) The excited dipole mode by a line source inside the cavity. (c) A dipole source is placed in air. (d) The excited monopole mode by a dipole source inside the cavity. In plots a, b, d, the core regions are air with radii R₁ = 15 mm. The squares with side length 100 mm represent the outer boundary of MNZ regions with parameters ε₂ = 1 and μ₂ = 0.001. A line source with a current 1 A is placed at the position (10 mm, 0) for case (a) and (b), while for case (c) and (d), the electric dipole source consists of two line currents of −1 A and +1 A and the line sources are placed at the positions (5 mm, 0) and (10 mm, 0) respectively. The white region means that the field values are beyond the scope of the color bar.