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An example of multiple gaps in the spectrum of a periodic waveguide. (English. Russian original) Zbl 1193.35038
Sb. Math. 201, No. 4, 569-594 (2010); translation from Mat. Sb. 201, No. 4, 99-124 (2010).

MSC:
35J57 Boundary value problems for second-order elliptic systems
35J20 Variational methods for second-order elliptic equations
35P15 Estimates of eigenvalues in context of PDEs
78A50 Antennas, waveguides in optics and electromagnetic theory
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