Coupling Analysis of the Surface States in Periodic Microwave Transmission Line
The spectrum of electromagnetic waves in periodic linear structures, such as periodic waveguides or chains of microelements i.e. spheres, cavities, exhibit the sequence of stop bands for propagating waves. Breaking the translational symmetry of the periodic microstrip can also lead to the localizati...
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Main Authors | , , , , , , , , |
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Format | Journal Article |
Language | English |
Published |
20.03.2023
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Subjects | |
Online Access | Get full text |
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Summary: | The spectrum of electromagnetic waves in periodic linear structures, such as
periodic waveguides or chains of microelements i.e. spheres, cavities, exhibit
the sequence of stop bands for propagating waves. Breaking the translational
symmetry of the periodic microstrip can also lead to the localization of the
microwaves at the microstrip edge. In this paper, we investigated periodic
microstrip transmission line represented as 1D photonic crystal operating at
the GHz frequencies. On the ground of topology, we explain the condition of
surface state existence. The transmission measurements and numerical
calculations support our theoretical predictions. Moreover, we show that in the
symmetric microstrip the surface states split into symmetric and antisymmetric
modes due to evanescent wave coupling between the modes localized on the
opposite sides of the microstrip. Interestingly, both modes offer significant
microwave transmission inside the frequency gap, which is promising for
applications. |
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DOI: | 10.48550/arxiv.2304.08245 |