An Efficient Semianalytical Modal Analysis of Rectangular Waveguides Containing Metamaterials with Graded Inhomogeneity

<div>The stopband bandwidths between the backward LSE<sub>10</sub> mode and the forward LSE<sub>20</sub> mode versus the profile parameter <svg height="9.48819pt" id="M67" style="vertical-align:-0.1802893pt" version="1.1" viewbox="-0.0498162 -9.3079 6.98937 9.48819" width="6.98937pt" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><g transform="matrix(.013,0,0,-0.013,0,0)"><path d="M517 51L485 54C448 58 441 63 441 115V712C404 700 337 684 285 678V653C357 648 362 645 362 580V437C339 446 309 449 295 449C159 449 38 340 38 201C38 61 143 -12 223 -12C234 -12 261 -6 301 17L362 53V-12C420 9 495 22 517 26V51ZM362 85C338 67 301 51 266 51C201 51 128 109 128 228C128 373 212 411 259 411C296 411 338 395 362 360V85Z"></path></g></svg> for the constant, linear, parabolic, and exponential profiles.</div>

International Journal of Antennas and Propagation

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Figure 6

Figure 6: An Efficient Semianalytical Modal Analysis of Rectangular Waveguides Containing Metamaterials with Graded Inhomogeneity 